CN106390747B - Exhaust gas purifier of marine diesel engine - Google Patents

Exhaust gas purifier of marine diesel engine Download PDF

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CN106390747B
CN106390747B CN201610679360.8A CN201610679360A CN106390747B CN 106390747 B CN106390747 B CN 106390747B CN 201610679360 A CN201610679360 A CN 201610679360A CN 106390747 B CN106390747 B CN 106390747B
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waste gas
filtering
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circular
catalytic oxidation
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CN106390747A (en
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陈妙生
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention relates to a waste gas purifier of a marine diesel engine, which is used for treating hydrocarbon, carbon monoxide, oxynitride, dust and noise contained in waste gas discharged by incomplete combustion of fuel oil of the diesel engine; the method is characterized in that: the waste gas under the working condition of high temperature and high pressure flows through the reducing pipeline for pressure reduction, is divided and separated and then flows into the first-stage waste gas catalytic oxidation reduction device, the second-stage waste gas filtering and contacting device, the third-stage waste gas catalytic oxidation reduction device and the fourth-stage waste gas purifying and separating device to obtain secondary catalytic oxidation reduction, filtering and contacting, and repeated treatment of separation and purification, the catalytic reduction efficiency of the waste gas containing hydrocarbon, carbon monoxide and nitrogen oxide can reach more than 95%, the removal rate of the dust particle size PM2.5 can reach more than 90%, and the whole noise reduction capability of the noise can reach more than 45 decibels, so that the purposes of stabilizing catalytic reduction, dust separation and purification and noise reduction effect can be realized on the waste gas.

Description

Exhaust gas purifier of marine diesel engine
Technical Field
The invention belongs to the field of exhaust gas purification of marine diesel engines, and particularly relates to purification of exhaust gas discharged due to incomplete combustion.
Background
At present, for medium-and small-sized medium-and high-speed high-power marine diesel engines, a treatment device for treating hydrocarbon, carbon monoxide, oxynitride, dust and noise contained in exhaust gas discharged due to incomplete combustion does not exist, a grid sheet with a special geometric shape is used as a carrier, a plurality of airflow filtering channels are arranged by the grid sheet, a precious metal three-way catalyst is coated on the surface of the grid sheet, and a metal return wire formed by cutting stainless steel materials is used as a filtering contact device, so that a set of exhaust gas purifier is formed, is used for treating the exhaust gas discharged due to incomplete combustion of the medium-and small-sized medium-and high-speed high-power marine diesel engines, implements catalytic oxidation reduction, contact and filtration, separation and purification, and simultaneously has high-efficiency environment-friendly equipment with dust removal and noise reduction effects on the exhaust gas containing dust and.
Disclosure of Invention
The invention provides a waste gas purifier for a medium-small medium-high speed high-power marine diesel engine, which adopts the following technical scheme.
A waste gas purifier of a marine diesel engine comprises an outer circle shell, a waste gas inlet pipeline with a flange, an inlet reducing pipeline, a first-stage waste gas catalytic oxidation reduction device, a second-stage waste gas filtering contact device, a third-stage waste gas catalytic oxidation reduction device, a fourth-stage waste gas purifying and separating device, an outlet reducing pipeline and a waste gas outlet pipeline with a flange, wherein the outer circle shell is internally provided with the waste gas inlet pipeline with the flange; the inlet reducing pipeline is provided with a water inlet pipeline, the outlet reducing pipeline is provided with a water outlet pipeline, a water inlet flow control valve and a water outlet flow control valve; two circular rings are arranged on the upper portion of the outer circular shell, two support frames are arranged on the lower portion of the shell, and a bottom plate of each support frame is provided with a structure with 2 waist-shaped holes.
The first-stage exhaust gas catalytic oxidation reduction device and the third-stage exhaust gas catalytic oxidation reduction device are characterized in that: the device is internally divided into a left circular grating sheet and a right circular grating sheet which are taken as a combined body; the left circular grid piece is used as a single component, the thickness of the left circular grid piece is set to be 20-25 mm, the thickness of the circular shell is set to be 8-12 mm, and a plurality of grid pieces with herringbone and C-shaped structures are processed inside the shell; the left circular grid plate is intersected on the 45-degree a inclined plane by the inlet horizontal plane, is also intersected on the upper horizontal plane or the lower horizontal plane, and is further intersected on the 45-degree inner inclined plane, and the 45-degree inner inclined plane is also intersected on the outlet horizontal plane to form a triangular convex surface; the inlet horizontal plane on the reverse side is intersected at a 45-degree b inclined plane, the 45-degree b inclined plane is further intersected at a lower horizontal plane or an upper horizontal plane, the direction is opposite to the gas inflow direction, the opening is downward or upward to form a C shape, the C shape is called a C-shaped recovery tank, and the extension surface of the C shape is intersected at the outlet horizontal plane; the right circular grid plate is used as a monomer component, the size of the right circular grid plate is the same as the thickness of the left circular grid plate and the thickness of the circular shell, and a plurality of grid plates with herringbone and C-shaped structures are processed in the shell; the right circular grid plate is intersected with a 45 DEG b inclined plane by an inlet horizontal plane, the 45 DEG b inclined plane is intersected with an upper horizontal plane or a lower horizontal plane, the direction is opposite to the gas inflow direction, the opening is downward or upward to form a C shape, the C shape is called a C-shaped recovery tank, and the extension surface of the C shape is intersected with an outlet horizontal plane; the outlet horizontal plane of the left circular grid plate is combined with the inlet horizontal plane of the right circular grid plate to form a concave collecting tank; a central bolt hole at the central position and a central line which is arranged on the left circular grid sheet and intersects with the lower central inlet horizontal plane are arranged on the left circular grid sheet, a 45-degree inclined plane is arranged at the central position, and the 45-degree inclined plane at the central position and the outer planes at the two sides are intersected to form a herringbone opening; the inner sides of the shells of the left circular grid piece and the right circular grid piece are on the same central line, and 4 inner side bolt holes which are at equal angles, are on the same circle and have the size of 18-22 mm are arranged; a central bolt hole is formed in the same central line of the left circular grid plate and the right circular grid plate, and the size of the central bolt hole is 18-22 mm; the central bolt hole and the herringbone opening of the left circular grid plate are arranged on the right circular grid plate to correspond to each other, the outer planes on the two sides of the herringbone opening are intersected with the 45-degree inclined planes, the 45-degree inclined planes are further intersected with the outlet horizontal plane, the herringbone openings of the left circular grid plate and the right circular grid plate correspond to each other to form a closed kidney-shaped groove, the compression strength after the left circular grid plate and the right circular grid plate are connected with each other is improved to serve as 1 combination, and 6 or more than 6 combinations are arranged to assemble a first-stage waste gas catalytic oxidation reduction device or a third-stage waste gas catalytic oxidation reduction device.
The first stage of exhaust gas catalytic oxidation reduction device or the third stage of exhaust gas catalytic oxidation reduction device is provided with an airflow filtering channel, and is characterized in that: the thickness of the plate wall of the airflow filtering channel is set to be 5-8 mm, the maximum distance between the plate wall and the plate wall is set to be 40-45 mm, and the minimum distance between the upper horizontal plane and the lower horizontal plane in the airflow filtering channel is set to be 12-15 mm; the horizontal central lines of the left circular grating sheet and the right circular grating sheet are taken as symmetrical axes, and the airflow filtering channels at the upper part and the lower part are arranged to be mutually symmetrical; reinforcing ribs are arranged among the airflow filtering channels at equal intervals, the thickness of each reinforcing rib is set to be 5-8 mm, the depth of each reinforcing rib is set to be 15-20 mm, and the reinforcing ribs are arranged at the top end of the C-shaped recovery tank; and the distance between the reinforcing ribs is set to be 50-55 mm; the left circular grid plate and the right circular grid plate are processed or cast into a form similar to a porous honeycomb shape, and the number of airflow filtering channels can be doubled after the combination 1 and the combination 1 are assembled in a plurality of and cross-shaped arrangement.
The second-stage waste gas filtering and contacting device is characterized in that: the device is characterized in that a cylindrical shell is arranged in the device, the thickness of the shell is set to be 8-12 mm, 4 convex left-side semicircular baffles and right-side semicircular baffles which are at equal angles are arranged on two sides of an inner circle of the cylindrical shell, the thickness of the left-side semicircular baffles and the right-side semicircular baffles is set to be 15-20 mm, 4 left-side internal thread holes and right-side internal thread holes which are at equal angles are arranged on the central line of the same circle of the left-side semicircular baffles and the right-side semicircular baffles, and the diameter of a thread is set to be M16-M20 mm; the middle position of the cylindrical shell is provided with circular filtering and rectifying plates with equal distance between the circular holes, the thickness of the circular filtering and rectifying plates is set to be 10-12 mm, the diameter of the circular holes of the circular filtering and rectifying plates is set to be 15-20 mm, and the wall thickness interval between the circular holes on the circular filtering and rectifying plates is set to be 6-10 mm; the central position of the circular filtering and rectifying plate is provided with a central bolt hole, and the central positions of the planes at the left side and the right side of the circular filtering and rectifying plate are provided with a bolt sleeve which can penetrate through the central bolt hole, 4 reinforcing ribs which are arranged at equal angles and have slopes and 4 waist-shaped semicircular holes; the hole diameter of the central bolt hole is set to be 18-22 mm, the outer diameter of the bolt sleeve is set to be 30mm, and the inner diameter of the bolt sleeve is set to be 18-22 mm; the thickness of the reinforcing rib with the slope is set to be 6-8 mm, the slope is set to be 1/10mm, and the height is set to be 10-20 mm; one end of a reinforcing rib with gradient is crossed with the excircle of the bolt sleeve and is pasted on the circular filtering and rectifying plate for welding and fixing, and the other end of the reinforcing rib is crossed on the excircles of 4 waist-shaped semicircular holes of the circular filtering and rectifying plate for welding and fixing; then the excircle of the circular filtering and rectifying plate is positioned on the excircle of the cylindrical shell and is welded and fixed; cutting stainless steel material into metal broken wires to form a plurality of balls as filtering contact carriers, and arranging the balls between gaps at the left side and the right side of a circular filtering rectifying plate in a cylindrical shell; cutting a single metal return wire into pieces with the thickness of 0.4-0.6 mm and the width of 4-8 mm; the length of the second-stage waste gas filtering and contacting device is set to be 200-250 mm, and a noble metal ternary catalyst is required to be coated on the surface of a carrier of the second-stage waste gas filtering and contacting device, so that a set of second-stage waste gas filtering and contacting device is formed; the method aims to arrange metal return wires on the left side and the right side of a circular filtering and rectifying plate to form a plurality of spherical bodies as filtering contact carriers, to ensure that inflowing waste gas has a turbulent flow effect in the spherical bodies formed by the metal return wires and then rebounds and reflows after contacting with the circular filtering and rectifying plate, to utilize the mode that the continuously inflowing waste gas pushes forward waves by the waves behind the Yangtze river, to ensure that the waste gas is pushed by rear pressure, to ensure that the waste gas is rectified in each round hole of the circular filtering and rectifying plate and has a turbulent flow process in the spherical bodies formed by the metal return wires, to ensure that the waste gas after generating turbulent flow is subjected to overlapped catalytic oxidation reduction, surface area contact and filtering with depth and breadth in the carriers, and to repeatedly separate and purify the waste gas.
The fourth-stage waste gas purification and separation device is characterized in that: the inner part of the shell is respectively provided with a right upper semicircular baffle cylindrical shell and a right lower semicircular baffle cylindrical shell, the length of the shell is set to be 200-220 mm, and the thickness of the shell is set to be 8-12 mm; the left side surface of the inner circle of the cylindrical shell is respectively provided with 4 convex left side surface a semicircular baffles and left side surface B semicircular baffles which are at equal angles, the plate thickness of the baffles is set to be 12-16 mm, 4 inner side bolt holes A and inner side bolt holes B which are at equal angles are arranged on the same central line of the convex left side surface a semicircular baffles and the left side surface B semicircular baffles, and the hole diameters of the bolt holes are set to be 18-22 mm; the depth of the semicircular baffle on the upper part of the right side exceeds the central line, the size of the semicircular baffle is set to be 36-40 mm, and the thickness of the semicircular baffle is set to be 12-16 mm; the central line of the upper semicircular baffle on the right side is provided with 1 central threaded hole, and the aperture of the central threaded hole is set to be between M16 and M20 mm; 1 convex semicircular baffle plates with the right side surface a vertical to the horizontal center line and arranged on the inner side of the cylindrical shell are arranged on the lower side of the opening part of the semicircular baffle plate on the upper part of the right side, and the plate thickness of the semicircular baffle plates is set to be 12-16 mm; the semicircular baffle plate at the upper part of the right side is provided with 3 inner side bolt holes which are arranged on the central line of the same circle, wherein 1 inner side bolt hole is arranged on the horizontal central line and above the inner circle side of the cylindrical shell, and the other 2 inner side bolt holes are respectively arranged on the horizontal central line and the left side and the right side of the inner circle of the cylindrical shell, and the hole diameter of each bolt hole is set to be 18-22 mm; the depth of the semicircular baffle at the lower part of the right side exceeds the central line, the size is set to be 36-40 mm, and the plate thickness is set to be 12-16 mm; a central bolt hole is arranged on the central line of the semicircular baffle at the lower part of the right side, and the aperture of the bolt hole is set to be 18-22 mm; 1 convex right side face b semicircular baffle which is perpendicular to a horizontal central line and is arranged on the inner circle side of the cylindrical shell is arranged on the upper side of the opening part of the right lower semicircular baffle, and the thickness of the baffle is set to be 12-16 mm; 3 central lines of the same circle are arranged on the semicircular baffle plate at the lower part of the right side, wherein 1 is arranged on the horizontal central line and below the inner circle side of the cylindrical shell, and the other 2 inner side bolt holes are respectively arranged on the horizontal central line and the left side and the right side of the inner circle of the cylindrical shell, and the hole diameter of the bolt hole is set to be 18-22 mm; a plurality of spherical shapes formed by metal broken wires are arranged between gaps in the cylindrical shell of the semicircular baffle plate at the upper part of the right side and the cylindrical shell of the semicircular baffle plate at the lower part of the right side; at the opening of the semicircular baffle at the lower part of the right side, namely at the waste gas outlet, a semicircular metal filter screen is arranged for protecting a plurality of balls formed by metal return wires, the depth of the semicircular metal filter screen exceeds the central line and is set to be 36-40 mm, the diameter of the outer circle of the semicircular metal filter screen is set to be 3-4 mm smaller than the diameter of the outer circle of the cylindrical shell of the semicircular baffle at the lower part of the right side, and the mesh size of the semicircular metal filter screen is set to be 10-12 meshes; arranging a frame plate with a semicircular round hole for fixing a semicircular metal filter screen in the device, wherein the thickness of the semicircular round hole frame plate is set to be 4-5 mm, and the aperture of the semicircular round hole is set to be the same as the opening size of a semicircular baffle plate at the lower part of the right side; the depth of the frame plate exceeds the central line and is set to be 36-40 mm; the fourth-stage waste gas purification and separation device is assembled by arranging 3 semicircular round hole frame plates on the central line of the same circle, wherein 1 of the semicircular round hole frame plates is arranged above the horizontal central line, the semicircular round hole frame plates and the semicircular side, and the other 2 semicircular round hole frame plates are respectively arranged on the horizontal central line of the semicircular round hole frame plates and are provided with inner side bolt holes on the left side and the right side, and the hole diameters of the bolt holes are set to be 18-22 mm; the technical scheme includes that metal return wires are respectively arranged inside a cylindrical shell of a semicircular baffle on the upper portion of the right side and inside a cylindrical shell of a semicircular baffle on the lower portion of the right side to form a plurality of spherical bodies to serve as filtering contact carriers, the aim is to enable inflowing waste gas to play a turbulent flow in the spherical bodies formed by the metal return wires, enable the waste gas to rebound and flow downwards after being in contact with the semicircular baffle on the upper portion of the right side, play a turbulent flow in the spherical bodies formed by the metal return wires, enable the waste gas to rebound and flow upwards after being in contact with the semicircular baffle on the lower portion of the right side, enable the waste gas after generating the turbulent flow to be in the carriers, implement multiple catalytic oxidation reduction, contact and filtration with wide surface area, and separate and purify the waste gas.
The positioning and fastening mode of the waste gas purification device is characterized in that: at the inlet of the waste gas, 4 left-side internal bolts are used to be communicated with and then connected with 4 left-side internal thread holes on the left side surfaces of the first-stage waste gas catalytic oxidation reduction device and the second-stage waste gas filtering contact device for fixing, and the thread diameter of the front end part of each bolt is set to be between M16 and M20 mm; at the center of an inlet of waste gas, 1 inlet center bolt is communicated with center bolt holes of a first-stage waste gas catalytic oxidation reduction device, a second-stage waste gas filtering and contacting device and a third-stage waste gas catalytic oxidation reduction device, and then is connected and fixed by a center positioning nut, and the diameter of a thread at the front end part of the inlet center bolt and the inner diameter of the nut are set to be between M16 and M20 mm; similarly, at the waste gas outlet at the opposite position, 4 right-side internal bolts are communicated with and then connected with 4 right-inner threaded holes on the right side surfaces of the fourth-stage waste gas purification and separation device, the third-stage waste gas catalytic oxidation reduction device and the second-stage waste gas filtering and contacting device for fixing, and the thread diameter of the front end part of the right-side internal bolt is set to be between M16 and M20 mm; the central part of the waste gas outlet is connected and fixed with the central bolt hole of the lower semicircular baffle plate and the central threaded hole of the upper semicircular baffle plate of the fourth-stage waste gas purification and separation device by 1 outlet central bolt, and the thread diameter of the front end part of the outlet central bolt is also set between M16-M20 mm, so that a set of waste gas purification device which can perform catalytic oxidation reduction, filtration, contact, separation and purification on waste gas is assembled.
The gas filtering channels in the first-stage waste gas catalytic oxidation reduction device and the third-stage waste gas catalytic oxidation reduction device are characterized in that: is composed of a special geometric shape, and a noble metal three-way catalyst is coated on the surface of the special geometric shape to be used as a carrier; the method comprises the steps that waste gas containing harmful gas, dust and noise is decompressed after flowing through a reducing pipeline by utilizing gas hot pressing as driving force, then the split flow separation of the waste gas is implemented, and a plurality of triangular convex surfaces are formed by processing the insides of a left circular grid sheet and a right circular grid sheet into a herringbone structure, along the inflow direction, an inlet horizontal plane, a 45-degree a inclined plane, an upper horizontal plane or a lower horizontal plane, a 45-degree inner inclined plane and intersecting at an outlet horizontal plane through a gas filtering channel in a first-stage waste gas catalytic oxidation reduction device or a third-stage waste gas catalytic oxidation reduction device; the inlet horizontal plane and the 45-degree b inclined plane on the reverse side are intersected on the lower horizontal plane or the upper horizontal plane, the C-shaped recovery grooves with downward or upward openings in the opposite directions towards the gas inflow are connected with each other to form a triangular convex surface and a triangular groove, which are called as C-shaped recovery grooves and concave collecting grooves, and the C-shaped recovery grooves and concave collecting grooves are also used for mutually corresponding central bolt holes and central inlet horizontal plane, 45-degree inclined planes at the central position, outer planes at two sides and herringbone openings, with downward or upward openings, so as to form an airflow filtering channel with a special geometric structure; when the waste gas flows into the gas flow filtering channel and contacts with the inner plate wall of the gas flow filtering channel, inertial collision occurs, and a strong backflow vortex and a centrifugal force can be formed at the inner part and the outer part of the C-shaped recovery tank and the concave collecting tank; under the action of centrifugal force, 24 effective negative pressure areas can be formed in a first-stage waste gas catalytic oxidation reduction device or a gas filtering channel in a third-stage waste gas catalytic oxidation reduction device, namely 48 effective negative pressure areas can be formed in the whole gas filtering channel; the method aims to achieve the treatment effects that waste gas containing hydrocarbon and carbon monoxide is subjected to catalytic oxidation reaction to form carbon dioxide and moisture, and oxynitride is subjected to reduction reaction to form nitrogen and oxygen, and liquid drops are formed by utilizing the principle that moisture adsorbs dust and are pushed into each effective negative pressure area along the inner plate wall of an airflow filtering channel of a C-shaped recovery tank and a concave collecting tank to be accumulated and settled in a dead weight manner, so that the purpose of dust removal is achieved, and the filtering and purifying treatment is performed; the C-shaped recovery tank and the concave collecting tank are arranged on the geometric structure airflow filtering channel, and the noise contained in the waste gas is subjected to silencing treatment by using the sound wave of the noise, so that the sound wave can play a role in retroreflection and rebound in the wall of the geometric structure airflow filtering channel, the noise of high, medium and low audio frequencies flowing into the airflow filtering channel can be gradually weakened, the noise reduction and silencing effects are achieved, and the noise reduction capacity can reach more than 23 decibels.
A circular filtering and rectifying plate arranged in the second-stage waste gas filtering and contacting device is used as a gas rectifying channel, and a right upper semicircular baffle and a right lower semicircular baffle are respectively arranged in the fourth-stage waste gas purifying and separating device; the method is characterized in that: when the exhaust gas flows in, 1 effective negative pressure area can be formed on the circular filtering and rectifying plate arranged in the second-stage exhaust gas filtering and contacting device, the diameter of the circular holes is equal, and the circular holes are positioned in the wall thickness gap between the circular holes which are arranged equally, namely the back of the gas and contacting surface; in the clearance region that is equipped with the semicircular baffle in right side upper portion and the semicircular baffle back in right side lower part respectively in fourth level exhaust purification separator, can form each 1 effectual negative pressure region, like this in second level exhaust filtration contact device and fourth level exhaust purification separator's inside, separation and purification treatment are implemented to the waste gas that contains the dust in total 3 effectual negative pressure regions.
The waste gas purifier is characterized in that: the pipe wall thickness of the waste gas inlet pipeline, the inlet reducing pipeline, the outer circle shell, the outlet reducing pipeline and the waste gas outlet pipeline is set to be 8-12 mm, flanges are arranged on the waste gas inlet pipeline and the waste gas outlet pipeline, and the thickness of the flanges is set to meet the requirement that the pressure capacity is more than 1.0 MPa; the inlet reducing pipeline and the outlet reducing pipeline are provided with a water inlet pipeline and a water outlet pipeline for back washing, which are connected with a water inlet flow control valve and a water outlet flow control valve, the diameters of the water inlet pipeline and the water outlet pipeline are set to be between 20A and 25A, and the water inlet flow control valve and the water outlet flow control valve are both provided with stop valves or ball valves in threaded connection; the purpose is to utilize high pressure water or urea liquid to clean and remove dust in the waste gas purifier, after a period of time for catalytic oxidation reduction of waste gas and separation and purification treatment of dust, the dust is accumulated and settled in the gas filtering channels of the first stage waste gas catalytic oxidation reduction device and the third stage waste gas catalytic oxidation reduction device, in 48 effective negative pressure areas, and in the gap area between the upper semicircular baffle plate at the right side and the lower semicircular baffle plate at the back side and in 3 effective negative pressure areas on the circular filter plate arranged in the second stage waste gas filtering contact device, the same diameter and the distance of the circular holes are in the wall thickness gap between the circular holes which are arranged evenly, namely the back side of the waste gas and the contact surface, in the fourth stage waste gas purification separation device, the waste gas purifier keeps good air permeability and treatment effect, the functions of maintenance management and prolonging the service life of the system are achieved; the thickness of the bottom plate is set to be 12-16 mm, the thickness of the supporting plate and the reinforcing plate perpendicular to the bottom plate is set to be 9-12 mm, 2 waist-shaped holes are formed in the left bottom plate and the right bottom plate respectively, the size of each waist-shaped hole is set to be 20-27 mm, the length of each waist-shaped hole is set to be 45-50 mm, and the supporting frames are used for positioning and fixing the waste gas purifier; the inner diameter of each circular hanging ring is set to be between 24 and 30mm, the outer diameter of each circular hanging ring is set to be between 50 and 60mm, and the circular hanging rings are used for integrally hoisting and carrying the waste gas purifier; the waste gas inlet pipeline with the flange, the inlet reducing pipeline and the outer circle shell are connected with each other and welded and fixed, then the first-stage waste gas catalytic oxidation reduction device, the second-stage waste gas filtering contact device, the third-stage waste gas catalytic oxidation reduction device and the fourth-stage waste gas purification and separation device are put into the waste gas inlet pipeline and the outer circle shell as an integral component, and after the waste gas outlet position is positioned and fixed, the waste gas inlet pipeline and the waste gas outlet pipeline are connected with each other and welded and fixed, so that the whole waste gas purifier is assembled.
The working principle of the invention is as follows: the waste gas under the working condition of high temperature and high pressure enters an inlet reducing pipeline through a waste gas inlet pipeline which is mutually connected with an exhaust pipe of a diesel engine to implement a pressure reduction process measure on the high-pressure gas, and then passes through a first-stage waste gas catalytic oxidation reduction device, a left circular grid sheet and a right circular grid sheet which are formed by special geometric shapes and coated with a noble metal three-way catalyst on the surface are taken as carriers, so that the carriers are taken as 1 or a plurality of combinations, and then 6 or more than 6 gas filtering channels are arranged to form a plurality of gas filtering channels, so that the gas is not only divided and separated, but also the waste gas and the three-way catalyst coated with the noble metal on the surface are taken as carriers to implement large-area and long-time contact, so that the waste gas containing hydrocarbon and carbon monoxide has the treatment effects of catalytic oxidation reaction into carbon dioxide and moisture, and the reduction reaction of nitrogen oxide into, then the adsorption capacity of moisture to dust is utilized; the gas filtering channel is a triangular convex surface formed by processing a plurality of strips in a herringbone structure inside the left circular grid sheet and the right circular grid sheet, along the inflow direction, an inlet horizontal plane, a 45-degree a inclined plane, an upper horizontal plane or a lower horizontal plane, a 45-degree inner inclined plane and intersecting at an outlet horizontal plane; the inlet horizontal plane and the 45-degree b inclined plane on the reverse side are intersected on the lower horizontal plane or the upper horizontal plane, the C-shaped recovery grooves with downward or upward openings in the opposite directions towards the gas inflow are connected with each other to form a triangular convex surface and a triangular groove, which are called as C-shaped recovery grooves and concave collecting grooves, and the C-shaped recovery grooves and concave collecting grooves are also used for mutually corresponding central bolt holes and central inlet horizontal plane, 45-degree inclined planes at the central position, outer planes at two sides and herringbone openings, with downward or upward openings, so as to form an airflow filtering channel with a special geometric structure; when waste gas flows through the gas filtering channel, the C-shaped recovery tank and the concave collecting tank to be combined into a plate wall with a special geometric structure to contact, inertia conflict occurs, and after a strong backflow vortex is respectively formed inside and outside the C-shaped recovery tank and the concave collecting tank, a centrifugal force and an effective negative pressure area are generated; under the action of centrifugal force, the waste gas containing hydrocarbon and carbon monoxide is catalyzed and oxidized to form vaporous moisture, the moisture adsorbs dust contained in the waste gas to form liquid drops, and the liquid drops are pushed to 12C-shaped recovery tanks and 12 negative pressure areas inside and outside the concave collecting tanks, which are opened in different positions and in opposite directions towards gas inflow, along the inner plate wall of the gas filtering channel and by the horizontally inflowing waste gas; at the moment, the intercepted or recovered droplets containing dust in 24 effective negative pressure areas inside and outside the 12C-shaped recovery tanks and the 12 concave collecting tanks settle or are stored along the plate walls in the effective negative pressure areas inside and outside the C-shaped recovery tanks and the concave collecting tanks by the self weight; the C-shaped recovery tank and the concave collecting tank which are arranged on the airflow filtering channel are used for silencing the noise contained in the waste gas, and the method is characterized in that the sound wave of the noise is utilized to play a role in sound wave retro-reflection and rebound in the wall of the air filtering channel with a geometric structure, so that the noise of high, medium and low audio frequencies flowing into the airflow filtering channel can be gradually weakened, the noise reduction and silencing effects are achieved, and the noise reduction capacity can reach more than 23 decibels; however, the waste gas which is not oxidized by catalytic oxidation flows into the second stage waste gas filtering and contacting device, and the waste gas is treated by catalytic oxidation reduction, filtering and contacting, separating and purifying.
The second-stage waste gas filtering and contacting device is provided with a plurality of spherical filtering and contacting carriers formed by metal broken wires which are formed by the equal diameter of a circular hole and are arranged on the circular filtering and rectifying plate and stainless steel material cuttings at the left side and the right side, and a noble metal three-way catalyst coated on the surfaces of the carriers to implement large-area contact and filtration, and the purpose is that: the waste gas and the circular filtering and rectifying plates with equal diameter of the circular holes and equal distance are formed with metal return wires formed by cutting stainless steel materials on the left side and the right side to form a plurality of balls for filtering and contacting, and 1 effective negative pressure area can be formed on the circular filtering and rectifying plates, wherein the equal diameter of the circular holes and the equal distance are formed in the wall thickness gap between the equally arranged circular holes, namely the back of the waste gas contact surface; dust can be collected in the effective negative pressure area, and waste gas can be further subjected to catalytic oxidation reduction, filtering contact, separation and purification.
After the waste gas in the first stage waste gas catalytic oxidation reduction device is rectified to obtain catalytic oxidation reduction purification treatment, the waste gas flows into the second stage waste gas filtering contact device, the left side and the right side of the circular filtering rectification plate are provided with a plurality of spherical bodies formed by metal return wires as filtering contact carriers, the inflowing waste gas plays a turbulent flow role in the spherical bodies formed by the metal return wires, the waste gas is rebounded and reflowed after being contacted with the circular filtering rectification plate, and the waste gas continuously inflowing is pushed into the front waves in the form of the back waves of Yangtze river, so that under the condition that the waste gas is pushed by rear pressure, the waste gas is rectified in each circular hole of the circular filtering rectification plate and plays a turbulent flow configuration in the spherical bodies formed by the metal return wires, and the waste gas after generating the turbulent flow promotes the overlapped catalytic oxidation reduction in the carriers, The surface area contact filtration with depth and breadth is provided, and the treatment of separating and purifying the waste gas is repeatedly carried out.
The third stage waste gas catalytic oxidation reduction device has the structural shape completely the same as that of the first stage waste gas catalytic oxidation reduction device, is formed by a special geometric shape as a carrier, and is characterized in that a left circular grid sheet and a right circular grid sheet which are coated with a noble metal three-way catalyst on the surface are combined into a group, 6 or more than 6 groups are combined or arranged into a plurality of gas filtering channels to carry out shunting and separation treatment on waste gas; the gas filtering channel is a triangular convex surface formed by processing a plurality of strips in a herringbone structure inside the left circular grid sheet and the right circular grid sheet, along the inflow direction, an inlet horizontal plane, a 45-degree a inclined plane, an upper horizontal plane or a lower horizontal plane, a 45-degree inner inclined plane and intersecting at an outlet horizontal plane; the inlet horizontal plane and the 45-degree b inclined plane on the reverse side are intersected on the lower horizontal plane or the upper horizontal plane, the C-shaped recovery grooves with downward or upward openings in the opposite directions towards the gas inflow are connected with each other to form a triangular convex surface and a triangular groove, which are called as a C-shaped recovery groove and a concave collecting groove, and a central bolt hole and a central inlet horizontal plane which are positioned at the central position, a 45-degree inclined plane, outer planes on two sides and herringbone openings which are corresponding to each other are also provided with downward or upward openings, so that an airflow filtering channel with a special geometric structure is formed by combining the C-shaped recovery grooves and the concave collecting grooves; when waste gas flows through the gas filtering channel, the C-shaped recovery tank and the concave collecting tank to be combined into a plate wall with a special geometric structure to contact, inertia conflict occurs, and after a strong backflow vortex is respectively formed inside and outside the C-shaped recovery tank and the concave collecting tank, a centrifugal force and an effective negative pressure area are generated; under the action of centrifugal force, the waste gas containing hydrocarbon and carbon monoxide is catalyzed and oxidized to form vaporous moisture, the moisture adsorbs dust contained in the waste gas to form liquid drops, and the liquid drops are pushed to 12C-shaped recovery tanks and 12 negative pressure areas inside and outside the concave collecting tanks, which are opened in different positions and in opposite directions towards gas inflow, along the plate wall of the gas filtering channel and by the waste gas flowing in horizontally; at the moment, the intercepted or recovered dust-containing liquid drops in 24 effective negative pressure areas inside and outside the 12C-shaped recovery tanks and the 12 concave collecting tanks settle or are stored along the plate walls in the effective negative pressure areas inside and outside the C-shaped recovery tanks and the concave collecting tanks by the self weight; the C-shaped recovery tank and the concave collecting tank are arranged on the airflow filtering channel; the method for carrying out noise reduction treatment on the noise contained in the waste gas is characterized in that the sound wave of the noise is utilized, and the effect of sound wave retroreflection and rebounding can be achieved in the wall of the gas filtering channel plate with the geometric structure, so that the noise of high, middle and low audio frequencies flowing into the gas flow filtering channel can be gradually weakened, the noise reduction and noise reduction effects are achieved, and the noise reduction capacity can reach more than 23 decibels; and then the waste gas which is not subjected to catalytic oxidation reduction flows into a fourth-stage waste gas filtering and contacting device, and the waste gas is further subjected to catalytic oxidation reduction, filtering and contacting, separating and purifying treatment.
The fourth-stage waste gas purification and separation device is internally provided with a right upper semicircular baffle and a right lower semicircular baffle respectively, and metal broken wires formed by cutting stainless steel materials arranged in the gap parts of the two sections form a plurality of spherical shapes; the method is characterized in that: the cylindrical shell with the semicircular baffle on the upper part of the right side and the cylindrical shell with the semicircular baffle on the lower part of the right side are respectively internally provided with metal return wires to form a plurality of spherical bodies as filtering contact carriers, the process flow configuration that the inflowing waste gas forms a turbulent flow in the spherical bodies formed by the metal return wires, the waste gas rebounds to flow downwards after contacting with the semicircular baffle on the upper part of the right side and forms a turbulent flow in the spherical bodies formed by the metal return wires, and the waste gas rebounds to flow upwards after contacting with the semicircular baffle on the lower part of the right side is adopted, the waste gas after generating the turbulent flow is subjected to overlapped catalytic oxidation reduction in the carriers, further has deep and wide surface area contact filtration, and repeatedly performs separation and purification treatment on the waste gas.
When waste gas forms a plurality of spherical contacts and filters through metal return wires formed by cutting stainless steel materials of two sections of upper semicircular baffles and lower semicircular baffles arranged on the right side, the waste gas is blocked by the upper semicircular baffles and the lower semicircular baffles on the right side and forms a plurality of spherical filtering contacts with the metal return wires, the waste gas flows downwards and then flows upwards, and 2 effective negative pressure areas are formed in back clearance areas of the upper semicircular baffles on the right side and the lower semicircular baffles on the right side; at the waste gas outlet, the outlet pressure of the waste gas is increased, a plurality of balls formed by metal return wires are pushed outside the device, and the frame plate provided with a semicircular metal filter screen and a semicircular round hole is used for protecting the plurality of balls formed by the metal return wires; thus, the waste gas containing harmful gas, dust and noise is subjected to catalytic oxidation reduction and filtering contact again, so that the waste gas which is completely subjected to separation purification and noise reduction treatment can flow through the outlet reducing pipeline to be pressurized and then is discharged outwards along the waste gas outlet pipeline.
The waste gas purifier is characterized in that: a water inlet pipeline and a water outlet pipeline for back washing are respectively arranged on the waste gas inlet pipeline and the waste gas outlet pipeline at the two ends of the outer circular shell and are connected with a water inlet flow control valve and a water outlet flow control valve; the purpose is as follows: cleaning and removing the interior of the waste gas purifier by using high-pressure water or urea liquid, depositing and accumulating in gas filtering channels of a first-stage waste gas catalytic oxidation reduction device and a third-stage waste gas catalytic oxidation reduction device after catalytic reduction, separation and purification of waste gas for a period of time, in 48 effective negative pressure areas, in addition, in gaps which are arranged among round holes of round filtering rectification plates arranged in a second-stage waste gas filtering contact device, at the back of a gas contact surface, in a fourth-stage waste gas purification and separation device, in a gap area which is arranged between the backs of a right upper semicircular baffle and a right lower semicircular baffle, and dust in 3 effective negative pressure areas, so as to prevent the blockage caused by long-time accumulation of micro dust particles in each gas filtering channel and possibly influence the purification treatment effect of the whole waste gas purifier, the waste gas purifier can keep good ventilation and treatment effects, and has the functions of maintenance and management and prolonging the service life of the waste gas purifier.
The exhaust gas purifier, its purpose is; the exhaust gas discharged by the diesel engine due to incomplete combustion contains hydrocarbons, carbon monoxide, nitrogen oxides, dust and noise, and is subjected to secondary catalytic oxidation and reduction, filtration and contact, separation and purification treatment in a first-stage exhaust gas catalytic oxidation reduction device, a second-stage exhaust gas filtration and contact device, a third-stage exhaust gas catalytic oxidation reduction device and a fourth-stage exhaust gas purification and separation device, the exhaust gas is only used as an object for adsorbing dust, trapping, collecting and treating after being divided and separated, and the dust does not generate a blocking phenomenon caused by forming a plurality of spherical shapes in a filtering contact carrier by using metal broken wires cut by stainless steel materials and a gas filtration channel in a geometric structure; when waste gas contacts through gas filtering channels in the first-stage and third-stage waste gas catalytic oxidation reduction devices, inertia conflict occurs when the waste gas contacts with plate walls in the gas filtering channels with geometric structures, the gas and the 48 effective negative pressure areas of 24C-shaped recovery tanks and 24 concave collecting tanks in different positions in the first-stage waste gas catalytic oxidation reduction device and the third-stage waste gas catalytic oxidation reduction device perform catalytic oxidation reaction and reduction reaction on the waste gas to form moisture, and the dust is separated and purified by utilizing the principle of moisture adsorption; the waste gas flows through the gaps among the circular filtering and rectifying plates and the uniform diameter of the circular holes in the second-stage waste gas filtering and contacting device and the uniformly arranged circular hole wall thickness, namely the back of the contact surface of the waste gas and the gas, and the gap area between the backs of the right upper semicircular baffle and the right lower semicircular baffle in the fourth-stage waste gas purifying and separating device, and in 3 effective negative pressure areas, the waste gas is subjected to overlapped catalytic oxidation reduction and deep and wide surface area contact filtration, and the waste gas is repeatedly separated and purified, so that the separation and purification treatment can be completely realized; the C-shaped recovery tank and the concave collecting tank which are arranged on the airflow filtering channel are used for silencing the noise contained in the waste gas, and the method is characterized in that the sound wave of the noise is utilized to play a role in the sound wave retro-reflection and rebound in the wall of the air filtering channel plate with a geometric structure, so that the noise of high, medium and low audio frequencies flowing into the airflow filtering channel can be gradually weakened, and the purposes of noise reduction and silencing are achieved; thus, for waste gas containing hydrocarbon, carbon monoxide, oxynitride, dust and noise, the catalytic oxidation reduction efficiency can reach more than 95%, the removal effect on dust PM2.5 can reach more than 90%, and the total noise reduction and silencing effect can reach more than 45 decibels; in a word, the invention has the advantages of obvious technical effect, simple structure, compactness and reasonability; by implementing the process measures of pressure reduction and shunt separation on high-pressure waste gas, the noble metal three-way catalyst can perform catalytic oxidation reaction on hydrocarbon and carbon monoxide to form moisture and reduce oxynitride to form harmless gas of nitrogen and oxygen under the high-temperature working condition, the principle that the moisture adsorbs dust and utilizes centrifugal force and negative pressure area is exerted, effective stable separation and high purification are implemented on the dust, noise structurally obtains the sound wave retro-reflection and rebound effects, and the remarkable advantages of noise reduction and silencing effects are achieved.
Drawings
FIG. 1 is a schematic view of an exhaust purifier of the present invention;
FIG. 2 is a detailed sectional view of the first stage, second stage, third stage and fourth stage exhaust gas purifying and separating devices of FIG. 1;
FIG. 3 is an enlarged detailed cross-sectional view of the left and right circular grid segments of the first and third stages of catalytic oxidation devices of FIG. 1;
FIG. 4 is a view A-A of FIG. 1, showing a detailed view of an exhaust gas inlet duct of the exhaust gas purifier;
FIG. 5 is a detail view B-B of FIG. 2 of either the first stage or the third stage exhaust gas catalytic redox device;
FIG. 6 is a detailed view of the left circular grid plate and the right circular grid plate of the first stage catalytic oxidation-reduction unit or the third stage catalytic oxidation-reduction unit as a combined body overlapped with another combined body in view C-C of FIG. 2;
FIG. 7 is a detail section view of the second stage exhaust gas filtering contact device of FIG. 2 from view D-D;
FIG. 8 is a detailed sectional view of the fourth stage exhaust gas purification and separation device shown in FIG. 2, taken along line E-E;
fig. 9 is a detailed sectional view of the fourth stage exhaust gas purification and separation device shown in fig. 1, which is viewed from the F-F side. The notation in the figure is:
in fig. 1:
1-a waste gas purifier, 2-a waste gas inlet pipeline, 3-an inlet reducing pipeline, 4-an outer circular shell, 5-a first stage waste gas catalytic oxidation reduction device, 6-a second stage waste gas filtering contact device, 7-a third stage waste gas catalytic oxidation reduction device, 8-a fourth stage waste gas purifying and separating device, 9-an inlet central bolt, 10-a central positioning nut, 11-a left inner bolt, 12-a right inner bolt, 13-a semicircular metal filter screen, 14-a semicircular round hole frame plate, 15-an outlet central bolt, 16-an outlet reducing pipeline, 17-a waste gas outlet pipeline, 18-a water inlet pipeline, 19-a water inlet flow control valve, 20-a water outlet pipeline, 21-a water outlet flow control valve, 22-a circular ring, 23-support frame, 24-waist shape hole.
In fig. 2:
5-a first-stage waste gas catalytic oxidation reduction device, 51-a left circular grid sheet, 52-a right circular grid sheet, 53-an airflow filtering channel, and 5 a-a negative pressure area; 6-a second stage exhaust gas filtering contact device, 61-a cylindrical shell, 62-a circular filtering rectifying plate, 63-a bolt sleeve, 64-a reinforcing rib with a slope, 65-a round hole, 66 a-a left semicircular baffle, 66 b-a right semicircular baffle, 67-a metal return wire, 68-a central bolt hole, 69 a-a left internal threaded hole, 69 b-a right internal threaded hole, and 6 a-a negative pressure region; 7-a third-stage waste gas catalytic oxidation reduction device, 71-a left circular grid sheet, 72-a right circular grid sheet, 73-an airflow filtering channel and 7 a-a negative pressure area; 8-fourth-stage exhaust gas purification and separation device, 81 a-cylindrical shell of right upper semicircular baffle, 81B-cylindrical shell of right lower semicircular baffle, 82-metal broken wire, 83-right upper semicircular baffle, 84-inner threaded hole A, 84 a-left side a semicircular baffle, 84B-right side a semicircular baffle, 85-right lower semicircular baffle, 86-inner threaded hole B, 86 a-left side B semicircular baffle, 86B-right side B semicircular baffle circular hole, 87-central threaded hole, 88-central bolt hole, and 8 a-negative pressure region.
In fig. 3:
51. 71-a left circular grid sheet, 510, 710-an inner threaded hole, 511, 711-an inlet horizontal plane, 512, 712-a reinforcing rib, 513, 713-45-degree a inclined plane, 514, 714-45-degree b inclined plane, 515, 715-45-degree inner inclined plane, 516, 716-an outlet horizontal plane, 517, 717-C-shaped recovery groove, 518, 718-a central inlet horizontal plane, 519, 719-a central 45-degree inclined plane, 51a, 71 a-an upper horizontal plane, 51b, 71 b-a lower horizontal plane, 51C, 71C-a concave collecting groove, 51d, 71 d-a herringbone opening, 51e, 71 e-a central bolt hole; 52. 72-right circular grid plate, 520 and 720-inner threaded hole, 521 and 721-inlet horizontal plane, 522 and 722-reinforcing rib, 523, 723-45-degree a inclined plane, 524 and 724-45-degree b inclined plane, 525 and 725-45-degree inner inclined plane, 526 and 726-outlet horizontal plane, 527 and 727-C-shaped recovery groove, 528 and 728-central outlet horizontal plane, 529 and 729-central 45-degree inclined plane, 51a and 71 a-upper horizontal plane, 51b and 71 b-lower horizontal plane, 51C and 71C-concave collecting groove, 51d and 71 d-herringbone opening, 51e and 71 e-central bolt hole, 53 and 73-airflow filtering channel.
In fig. 4:
2-waste gas inlet pipeline, 3-inlet reducing pipeline, 4-outer circle shell, 18-water inlet pipeline, 19-water inlet flow control valve, 22-circular hanging ring, 23-support frame and 24-waist-shaped hole.
In fig. 5:
51. 71-left circular grid sheet, 510, 710-inner threaded hole, 511, 711-inlet horizontal plane, 512, 712-reinforcing rib, 513, 713-45-degree a inclined plane, 514, 714-45-degree b inclined plane, 518, 718-central inlet horizontal plane, 519, 719-central 45-degree inclined plane, 51a, 71 a-upper horizontal plane, 51b, 71 b-lower horizontal plane, 51d, 71 d-herringbone opening, 51e, 71 e-central bolt hole, 53, 73-airflow filtering channel.
In fig. 6:
5-first stage exhaust gas catalytic oxidation reduction device, 7-third stage exhaust gas catalytic oxidation reduction device, 51, 71-left circular grid sheet, 52, 72-right circular grid sheet, 510, 710-inner threaded hole, 53, 73-airflow filtering channel.
In fig. 7:
6-second-stage exhaust gas filtering contact device, 61-cylindrical shell, 62-circular filtering rectification plate, 63-bolt sleeve, 64-reinforcing rib with slope, 65-round hole, 66 a-left semicircular baffle, 66 b-right semicircular baffle, 67-metal wire return, 69 a-left internal threaded hole and 69 b-right internal threaded hole.
In fig. 8:
8-fourth-stage waste gas purification and separation device, 81 a-right upper semicircular baffle cylindrical shell, 82-metal broken wires, 83-right upper semicircular baffle, 84-inner threaded hole A, 84 a-left side surface a semicircular baffle, 84 b-right side surface a semicircular baffle, 87-central threaded hole, and 8 a-negative pressure area.
In fig. 9:
4-outer circular shell, 8-fourth-stage waste gas purification and separation device, 13-semicircular metal filter screen, 14-semicircular round hole frame plate, 15-outlet center bolt, 81B-cylindrical shell of right lower semicircular baffle plate, 82-metal wire return, 85-right lower semicircular baffle plate, 86-inner side threaded hole B, 86 a-left side surface B semicircular baffle plate, 86B-right side surface B semicircular baffle plate round hole, 88-center bolt hole and 8 a-negative pressure area.
Detailed Description
The device of the invention is further described below with reference to examples and figures.
As shown in fig. 1, 2, 3 and 4, the exhaust gas purifier 1 comprises an outer circular shell 4, and a waste gas inlet pipeline 2 with a flange, an inlet reducing pipeline 3, a first-stage waste gas catalytic oxidation-reduction device 5, a second-stage waste gas filtering and contacting device 6, a third-stage waste gas catalytic oxidation-reduction device 7, a fourth-stage waste gas purifying and separating device 8, an outlet reducing pipeline 16 and a waste gas outlet pipeline 17 with a flange are sequentially arranged in the outer circular shell 4; the waste gas inlet pipeline 2 and the waste gas outlet pipeline 17 at the two ends of the outer circular shell 4 are both provided with a back washing water inlet pipeline 18 and a back washing water outlet pipeline 20 which are connected with a control valve 19 of water inlet flow and a control valve 21 of water outlet flow, the lower part of the outer circular shell 4 is provided with two support frames 23, each bottom plate of each support frame 23 is provided with 2 waist-shaped holes 24, and the upper part of the outer circular shell 4 is provided with two circular hanging rings 22.
Referring to fig. 1, 2, 3, 5 and 6, the first stage catalytic oxidation-reduction unit 5 and the third stage catalytic oxidation-reduction unit 7 are divided into left circular grid plates 51 and 71 and right circular grid plates 52 and 72 as a combined body; the left circular grid pieces 51 and 71 are used as single parts, the thickness of each single part is set to be 20-25 mm, the thickness of each circular shell is set to be 8-12 mm, and a plurality of grid pieces with herringbone and C-shaped structures are processed inside each shell; the left circular grid sheets 51 and 71 are intersected at 45-degree a inclined planes 513 and 713 by inlet horizontal planes 511 and 711, the 45-degree a inclined planes 513 and 713 are intersected at upper horizontal planes 51a and 71a or lower horizontal planes 51b and 71b, and then intersected at 45-degree inner inclined planes 515, 715 and 45-degree inner inclined planes 515 and 715 are intersected at outlet horizontal planes 516 and 716, and conversely, the inlet horizontal planes 511 and 711 are intersected at 45-degree b inclined planes 514 and 714, and then intersected at lower horizontal planes 51b and 71b or upper horizontal planes 51a and 71a, and form a C shape towards the opposite direction of gas inflow, opening downwards or upwards, and are called C- shaped recovery grooves 517 and 717, and the extension surfaces of the C shape are outlet horizontal planes 516 and 716; the other right circular grid pieces 52 and 72 are single bodies, the thickness of the other right circular grid pieces is the same as that of the left circular grid pieces 51 and 71, and the right circular grid pieces 52 and 72 are single bodies and are also processed into a plurality of herringbone and C-shaped structures; the right circular grid plates 52 and 72 are intersected at 45-degree b inclined planes 524 and 724 by inlet horizontal planes 522 and 722, the 45-degree b inclined planes 524 and 724 are intersected at the upper horizontal planes 52a and 72a or the lower horizontal planes 52b and 72b, the openings of the upper and lower circular grid plates face to the opposite direction of gas inflow and form a C shape which is called a C- shaped recovery groove 527 and 727, and the extension surfaces of the C shape are intersected at outlet horizontal planes 526 and 726; a concave collection trough 51c, 71c is formed by the combination of the outlet levels 516, 716 of the left circular grid segments 51, 71 and the inlet levels 521, 721 of the right circular grid segments 52, 72; the left circular grid plates 51 and 71 are provided with central bolt holes 51e and 71e in central positions, central inlet horizontal planes 518 and 718 on central lines and below intersect at central 45-degree inclined planes 519 and 719, and the central 45-degree inclined planes 519 and 719 intersect with outer planes on two sides to form herringbone- shaped openings 51d and 71 d; the inner sides of the shells of the left circular grid pieces 51 and 71 and the shells of the right circular grid pieces 52 and 72 are all on the same central line, and 4 inner side bolt holes 510, 710, 520 and 720 which are at equal angles, are on the same circle and have the size of 18-22 mm are arranged; a central bolt hole 51e, 71e, 52e and 72e is arranged on the same central line of the left circular grating sheet 51 and 71 and the right circular grating sheet 52 and 72, and the size of the central bolt hole 51e, 71e, 52e and 72e is 18-22 mm; the central bolt holes 51e and 71e and the herringbone openings 51d and 71d of the left circular grid plates 51 and 71 and the central bolt holes 52e and 72e and the herringbone openings 52d and 72d arranged at the central positions on the right circular grid plates 52 and 72 correspond to each other, the outer planes at both sides of the herringbone openings 52d and 72d of the right circular grid plates 52 and 72 intersect with the 45-degree inclined planes 529 and 729 at the centers, the 45-degree inclined planes 529 and 729 at the centers further intersect with the outlet water planes 528 and 728, the herringbone openings 51d and 71d and the herringbone openings 52d and 72d of the left circular grid plates 51 and 71 and the right circular grid plates 52 and 72 correspond to each other to form a closed kidney-shaped groove, so that the strength of the left circular grid plates 51 and 71 and the right circular grid plates 52 and 72 after being connected with each other is increased, and then the arrangement of 6 or more is carried out as 1 or more combinations, the first-stage exhaust gas catalytic oxidation-reduction device 5 and the third-stage exhaust gas catalytic oxidation-reduction device 7 are assembled into respective sets.
According to the fig. 1, fig. 2, fig. 3, fig. 5 and fig. 6, the same airflow filtering channels 53, 73 are arranged inside the first stage exhaust gas catalytic oxidation reduction device 5 and the third stage exhaust gas catalytic oxidation reduction device 7, the thickness of the plate walls of the airflow filtering channels 53, 73 is set to be between 5 and 8mm, the maximum distance between the plate walls of the airflow filtering channels 53, 73 is set to be between 40 and 45mm, and the minimum distance between two upper horizontal planes 51a, 71a, 52a, 72a and lower horizontal planes 51b, 71b, 52b, 72b in the airflow filtering channels 53, 73 is set to be between 12 and 15 mm; the horizontal central lines of the left circular grating pieces 51 and 71 and the right circular grating pieces 52 and 72 are taken as symmetrical axes, and the airflow filtering channels 53 and 73 at the upper part and the lower part are arranged into symmetrical airflow filtering channels 53 and 73; reinforcing ribs 512, 712, 522 and 722 are arranged between the airflow filtering channels 53 and 73 at equal intervals, the thickness of the reinforcing ribs 512, 712, 522 and 722 is set to be between 5 and 8mm, the depth of the reinforcing ribs 512, 712, 522 and 722 is set to be between 15 and 20mm, and the reinforcing ribs are arranged at the top end parts of the C- shaped recovery grooves 517, 717, 527 and 727; the distance between the reinforcing ribs 512, 712, 522 and 722 is set to be 50-55 mm; the left circular grating sheets 51 and 71 and the right circular grating sheets 52 and 72 are processed or cast into a form similar to a porous honeycomb shape, and the number of the airflow filtering channels 53 and 73 can be doubled after the circular grating sheets of 1 combination and another circular grating sheets of 1 combination are assembled in a plurality and cross-shaped arrangement.
According to the fig. 1, 2 and 7, a cylindrical shell 61 is arranged inside the second-stage exhaust gas filtering and contacting device 6, the thickness of the cylindrical shell is set to be 8-12 mm, 4 convex left-side semicircular baffles 66a and right-side semicircular baffles 66b which are at equal angles are arranged on two sides of the inner circle of the cylindrical shell 61, the thickness of the left-side semicircular baffles 66a and the right-side semicircular baffles 66b is set to be 15-20 mm, 4 left-side internal threaded holes 69a and right-side internal threaded holes 69b which are at equal angles are arranged on the central line of the same circle of the left-side semicircular baffles 66a and the right-side semicircular baffles 66b, and the inner diameter of each threaded hole is set to be M16-M20 mm; the middle position of the cylindrical shell 61 is provided with circular filtering and rectifying plates 62 which have the same diameter of the circular holes 65 and are arranged at equal intervals among the equally arranged circular holes 65, the thickness of the circular filtering and rectifying plates 62 is set to be 10-12 mm, the diameter of the circular holes 65 of the circular filtering and rectifying plates 62 is set to be 15-20 mm, and the wall thickness interval among the circular holes 65 on the circular filtering and rectifying plates 62 is set to be 6-10 mm; a central bolt hole 68 is arranged at the central position of the circular filtering and rectifying plate 12, a bolt sleeve 63 which penetrates through the central bolt hole 68 and is provided with 4 reinforcing ribs 64 which are at equal angles and have slopes and 4 waist-shaped semicircular holes are arranged at the central positions of the planes at the left side and the right side, the aperture size of the central bolt hole 68 is set to be 18-22 mm, the outer diameter of the bolt sleeve 63 is set to be 30mm, and the inner diameter is set to be 18-22 mm; the thickness of the reinforcing rib 64 with the slope is set to be 6-8 mm, the slope is set to be 1/10mm, and the height is set to be 10-20 mm; one end of a reinforcing rib 64 with gradient is used for the excircle intersection of the bolt sleeve 63 and is pasted on the circular filtering rectification plate 62 for welding and fixing, and the other end is intersected on the excircles of the 4 waist-shaped semicircular holes of the circular filtering rectification plate 62 for welding and fixing; then the excircle of the circular filtering and rectifying plate 62 is positioned on the inner circle of the cylindrical shell 61 to be welded and fixed; stainless steel materials are cut into metal broken wires 67 to form a plurality of balls as filtering contact carriers which are arranged between gaps at the left side and the right side of a circular filtering rectification plate 62 in a cylindrical shell 61; the thickness of the metal wire loop 67 is 0.4-0.6 mm, the width is 4-8 mm, the thickness of the second stage waste gas filtering and contacting device 6 is 200-250 mm, and the surface of the carrier is coated with a noble metal ternary catalyst, so that the second stage waste gas filtering and contacting device 6 is formed.
As shown in fig. 1, 2, 8 and 9, the fourth stage exhaust gas purification and separation device 8 is provided therein with a right upper semicircular baffle cylindrical shell 81a and a right lower semicircular baffle cylindrical shell 81b, respectively, the lengths of which are set to be 200-220 mm and the thicknesses of which are set to be 8-12 mm; the left side surfaces of the inner circles of the two cylindrical shells are respectively provided with 4 convex left side surface a semicircular baffle plates 84a and left side surface B semicircular baffle plates 86a which are at equal angles, the thickness of each baffle plate is set to be 12-16 mm, 4 inner side bolt holes A84 and inner side bolt holes B86 which are at equal angles are arranged on the same central line of the convex left side surface a semicircular baffle plates 84a and the left side surface B semicircular baffle plates 86a, and the hole diameters of the bolt holes are set to be 18-22 mm; the depth of the semicircular baffle 83 at the upper part of the right side exceeds the central line, the size is set to be 36-40 mm, and the thickness is set to be 12-16 mm; a central threaded hole 87 is formed in the central line of the upper semicircular baffle 83 on the right side, and the diameter of the central threaded hole 87 is set to be between M16 and M20 mm; the lower side of the opening part of the right upper semicircular baffle 83 is provided with 1 convex right side surface a semicircular baffle 84b which is vertical to the horizontal central line and is arranged at the inner side of the cylindrical shell, and the thickness of the baffle is set to be 12-16 mm; the semicircular baffle 83 at the upper part of the right side is provided with 3 inner side bolt holes 84 with the hole diameter of 18-22 mm, wherein the 3 inner side bolt holes are arranged on the central line of the same circle, 1 of the 3 inner side bolt holes is arranged on the horizontal central line and above the inner circle side of the cylindrical shell, and the other 2 inner side bolt holes are respectively arranged on the horizontal central line and the left side and the right side of the inner circle of the cylindrical shell; the depth of the semicircular baffle 85 at the lower part of the right side exceeds the central line, the size is set to be 36-40 mm, and the thickness is set to be 12-16 mm; a central bolt hole 88 is arranged on the central line of the semicircular baffle 85 at the lower part of the right side, and the bolt hole diameter is set to be 18-22 mm; 1 convex right side face b semicircular baffle 86b which is vertical to the horizontal center line and is arranged on the inner circle side of the cylindrical shell is arranged on the upper side of the opening part of the right lower semicircular baffle 85, and the thickness of the baffle is set to be 12-16 mm; 3 inner side bolt holes 86 are arranged on the central line of the same circle on the lower semicircular baffle 85 at the right side, wherein 1 inner side bolt hole is arranged on the horizontal central line and below the inner circle side of the cylindrical shell, and the other 2 inner side bolt holes are respectively arranged on the horizontal central line and the left side and the right side of the inner circle of the cylindrical shell, and the hole diameter of each inner side bolt hole is set to be 18-22 mm; a plurality of spherical shapes formed by metal filaments 82 are arranged between gaps in the right upper semicircular baffle cylindrical shell 81a and the right lower semicircular baffle cylindrical shell 81 b; at the opening of the semicircular baffle 85 at the lower part of the right side, namely a waste gas outlet, a semicircular metal filter screen 13 is arranged for protecting a plurality of balls formed by metal return wires 82, the depth of the semicircular metal filter screen 13 exceeds the central line and is set to be 36-40 mm, the diameter of the outer circle of the semicircular metal filter screen 13 is set to be 3-4 mm smaller than the diameter of the outer circle of the cylindrical shell of the semicircular baffle 85 at the lower part of the right side, and the mesh size of the semicircular metal filter screen 13 is set to be 10-12 meshes; a frame plate 14 with a semicircular round hole is arranged for fixing the semicircular metal filter screen 13 in the device, the thickness of the semicircular round hole frame plate 14 is set to be 4-5 mm, and the aperture of the semicircular round hole is set to be the same as the opening size of the semicircular baffle 85 at the lower part of the right side; the depth of the semicircular round hole frame plate 14 exceeds the central line and is set to be 36-40 mm; the semicircular round hole frame plate 14 is provided with 3 central lines of the same circle, wherein 1 central line is vertical to the horizontal central line and above the semicircular round hole frame plate 14, and the other 2 inner side bolt holes 86 are respectively arranged on the horizontal central line of the semicircular round hole frame plate 14 and on the left side and the right side, and the hole diameter is set to be 18-22 mm, so that the fourth-stage waste gas purification and separation device 8 is assembled;
referring to fig. 1, 2, 3, 4, 5, 6, 7, 8, 9, the exhaust gas purification apparatus 1 is positioned and fastened at the exhaust gas inlet by connecting 4 left-side internal bolts 11 with the internal bolt holes 510, 520 of the first stage catalytic oxidation reduction unit 5 and 4 left-side internal thread holes 69a on the left side surface of the second stage exhaust gas filtering contact unit 6 after penetrating, and the thread diameter of the front end portion of the left-side internal bolt 11 is set to be M16-M20 mm; at the inlet center of the exhaust gas, 1 inlet center bolt 9 is used to penetrate through the center bolt holes 51e and 52e of the first-stage exhaust gas catalytic oxidation reduction device 5, the center bolt hole 68 of the second-stage exhaust gas filtering contact device 6 and the center bolt holes 71e and 72e of the third-stage exhaust gas catalytic oxidation reduction device 7, and then the center bolt holes are connected and fixed by a center positioning nut 10, and the thread diameter and the nut inner diameter of the front end part of the inlet center bolt 9 are set to be between M16 and M20 mm; similarly, at the exhaust gas outlet at the opposite position, 4 right-side inner bolts 12 are used to penetrate through the inner bolt holes 86 and 84 of the fourth-stage exhaust gas purification and separation device 8, the inner bolt holes 720 and 710 of the third-stage exhaust gas catalytic oxidation reduction device 7, and the right side surface of the second-stage exhaust gas filtering and contacting device 6 and 4 right-side inner threaded holes 69b and then are connected and fixed, and the thread diameter of the front end part of the right-side inner bolt 12 is set to be between M16 and M20 mm; the central part of the exhaust gas outlet is connected and fixed by 1 outlet central bolt 15, a central bolt hole 88 of a right lower semicircular baffle plate 85 and a central threaded hole 87 of a right upper semicircular baffle plate 83 of a fourth stage exhaust gas purification and separation device 8 after penetrating through the central bolt hole, and the thread diameter of the front end part of the outlet central bolt 15 is also set between M16 and M20mm, so that a purification device which can perform catalytic oxidation reduction, filtration, contact, separation and purification on the exhaust gas is assembled.
The working principle of the device of the invention is as follows: the working principle of the medium-small medium-high speed high-power marine diesel engine, which plays a role in catalyzing, oxidizing and reducing the exhausted gas containing hydrocarbon, carbon monoxide, oxynitride, dust and noise due to incomplete combustion, and simultaneously, implementing stable separation, effective purification and noise reduction and silencing treatment on the dust and the noise is as follows: the exhaust gas under the working condition of high temperature and high pressure enters an inlet reducing pipeline 3 through an exhaust gas inlet pipeline 2 which is mutually connected with an exhaust pipe of a diesel engine to carry out the process measure of reducing the pressure of the high-pressure gas, and the left circular grid sheet 51 and the right circular grid sheet 52 which are arranged in a first-stage exhaust gas catalytic oxidation reduction device 5 by special geometric shapes and coated with a noble metal three-way catalyst on the surface are taken as carriers, so that the carriers are taken as 1 or a plurality of combinations, and then 6 or more than 6 gas filtering channels 53 are arranged to form a plurality of gas filtering channels, so that the gas is not only subjected to the treatment of shunting and separating, and the purpose is to take the exhaust gas and the three-way catalyst coated with the noble metal on the surface as carriers to carry out large-area and long-time contact, so that the exhaust gas containing hydrocarbon and carbon monoxide is, the nitrogen oxide is reduced into nitrogen and oxygen, and the adsorption capacity of moisture on dust is utilized; the gas filtering channel 53 is a triangular convex surface formed by processing a plurality of strips inside the left circular grid plate 51 and the right circular grid plate 52 in a herringbone configuration along the inflow direction, an inlet horizontal plane 511, 521, a 45-degree a inclined plane 513, 523, an upper horizontal plane 51a, 52a or a lower horizontal plane 51b, 52b, a 45-degree inner inclined plane 515, 525 and intersecting an outlet horizontal plane 516, 526; the inlet horizontal planes 511, 521, 45 degree b inclined planes 514, 524 on the reverse side, the C- shaped recovery troughs 517, 527 which intersect the lower horizontal planes 51b, 52b or the upper horizontal planes 51a, 52a and open downwards or upwards in the opposite direction of gas inflow are connected with each other to form triangular convex and concave troughs which are called C- shaped recovery troughs 517, 527 and concave collecting troughs 51C, 52C, and the concave collecting troughs 51C, 52C which open downwards or upwards are combined by the central bolt holes 51e, 52e and the central inlet horizontal planes 518, 528 on the central position, the 45 degree inclined planes 519, 529 on the two sides and the herringbone openings 51d, 52d which correspond with each other and open downwards or upwards on the two sides; when the waste gas flows through the gas filtering channel 53, the C- shaped recovery tanks 517 and 527 and the concave collecting tanks 51C and 52C to be combined into a plate wall with a special geometric structure, inertia conflict occurs, and after a strong backflow vortex is respectively formed inside and outside the C- shaped recovery tanks 517 and 527 and the concave collecting tanks 51C and 52C, a centrifugal force and an effective negative pressure area 5a are generated; the waste gas containing hydrocarbon and carbon monoxide is catalyzed and oxidized into mist moisture under the action of centrifugal force, the moisture adsorbs dust in the waste gas to form liquid drops, and the liquid drops are pushed into 12C- shaped recovery grooves 517 and 527 which are opened in different positions and in opposite directions towards the gas inflow and 12 concave collecting grooves 51C and 52C inside and outside a negative pressure area 5a along the inner plate wall of the gas filtering channel 53 and by the horizontally inflowing waste gas; at this time, the intercepted or recovered droplets containing dust in 24 effective negative pressure areas 5a inside and outside the 12C- shaped recovery grooves 517 and 527 and the 12 concave type collecting grooves 51C and 52C settle or are stored along the plate walls in the effective negative pressure areas 5a inside and outside the C- shaped recovery grooves 517 and 527 and the concave type collecting grooves 51C and 52C by the self weight; the C- shaped recovery grooves 517 and 527 and the concave collecting grooves 51C and 52C which are arranged on the airflow filtering channel 53, and the noise contained in the waste gas is silenced by using the sound wave of the noise, the sound wave can play a role in retroreflection and rebound in the wall of the airflow filtering channel 53 with a geometric structure, so that the noise of high, medium and low audio frequencies flowing into the airflow filtering channel 53 can be gradually weakened, the noise reduction and silencing effects are achieved, and the noise reduction capability can reach more than 23 decibels; however, the exhaust gas which is not oxidized by catalytic oxidation flows into the second-stage exhaust gas filtering and contacting device 6, and the exhaust gas is subjected to catalytic oxidation reduction, filtering and contacting, separating and purifying.
The inside of the second-stage exhaust gas filtering and contacting device 6 is provided with a plurality of spherical filtering and contacting carriers formed by round holes 65 with equal diameter, metal return wires 67 which are arranged on the round filtering and rectifying plates 62 and are formed by cutting stainless steel materials on the left side and the right side, and a noble metal three-way catalyst coated on the surfaces of the carriers to implement large-area contact and filtration; the circular filtering and rectifying plates 62 with the same diameter of the circular holes 63 and the same distance are arranged with the same distance, and the metal return wires 67 formed by cutting the stainless steel materials on the left and the right sides form a plurality of ball-shaped filtering contacts, and 1 effective negative pressure area 6a can be formed on the circular filtering and rectifying plates 62, at the wall thickness gap between the circular holes 65 with the same diameter and same distance, namely the back of the waste gas contact surface; dust can be collected in the effective negative pressure area 6a, and the waste gas can be further treated.
The waste gas in the first stage waste gas catalytic oxidation reduction device 5 is rectified to obtain catalytic oxidation reduction purification treatment, then flows into the second stage waste gas filtering contact device 6, the left and right sides of the circular filtering rectification plate 62 are provided with metal return wires 67 to form a plurality of spherical shapes as filtering contact carriers, so that the inflowing waste gas can play a turbulent flow role in the plurality of spherical shapes formed by the metal return wires 67, and can rebound and flow back after contacting with the circular filtering rectification plate 62, and the waste gas continuously inflowing is pushed into the front waves in the form of Changjiang river back waves, under the condition that the waste gas is pushed by rear pressure, the waste gas is rectified in each circular hole 65 of the circular filtering rectification plate 62, and can play a turbulent flow process in the plurality of spherical shapes formed by the metal return wires 67, so that the waste gas after generating turbulent flow can promote overlapped catalytic oxidation reduction in the carriers, The surface area contact filtration with depth and breadth is provided, and the treatment of separating and purifying the waste gas is repeatedly carried out.
The third stage exhaust gas catalytic oxidation reduction device 7 is the same as the first stage exhaust gas catalytic oxidation reduction device 5 in structural shape, is composed of special geometric shapes, and takes the left circular grid sheet 71 and the right circular grid sheet 72 coated with the noble metal three-way catalyst on the surface as carriers, and takes the carriers as 1 or a plurality of combinations, and then carries out treatment of dividing and separating gas in 6 or more than 6 gas filtering channels 73 arranged into a plurality of groups, aiming at taking the exhaust gas and the three-way catalyst coated with the noble metal on the surface as carriers and implementing large-area and long-time contact, so that the exhaust gas containing hydrocarbon and carbon monoxide has the catalytic oxidation reaction to form carbon dioxide and moisture, the nitrogen oxide is reduced to form the treatment effect of nitrogen and oxygen, and then the adsorption capacity of the moisture to dust is utilized; the gas filtering channel 73 is a triangular convex surface formed by processing a plurality of strips inside the left circular grid plate 71 and the right circular grid plate 72 in a herringbone structure along the inflow direction inlet horizontal planes 711, 721, 45-degree a inclined planes 713, 723, the upper horizontal planes 71a, 72a or the lower horizontal planes 71b, 72b, 45-degree inner inclined planes 715, 725 and intersecting the outlet horizontal planes 716, 726; the inlet horizontal planes 711, 721, 45 degree b inclined planes 714, 724 on the reverse side, the C-shaped recovery grooves 717, 727 which intersect the lower horizontal planes 71b, 72b or the upper horizontal planes 71a, 72a and open downwards or upwards in the opposite direction of the gas inflow, form triangular convex and concave grooves which are called C-shaped recovery grooves 717, 727 and concave collecting grooves 71C, 72C, and the concave collecting grooves 71C, 72C which open downwards or upwards and combine into a special geometrical configuration of the gas flow filtering channel 73 by the central bolt holes 71e, 72e and the central inlet horizontal planes 718, 728, the 45 degree inclined planes 719, 729 on the center and the two side outer planes and the herringbone openings 71d, 72d which correspond to each other and open downwards or upwards; when waste gas flows through the gas filtering channel 73, the C-shaped recovery grooves 717 and 727 and the concave collecting grooves 71C and 72C to be combined into a plate wall with a special geometric structure to contact, inertia conflict occurs, and after a strong backflow vortex is respectively formed inside and outside the C-shaped recovery grooves 717 and 727 and the concave collecting grooves 71C and 72C, a centrifugal force and an effective negative pressure area 7a are generated; under the action of centrifugal force, the waste gas containing hydrocarbon and carbon monoxide is catalytically oxidized and reacted into mist moisture, the moisture adsorbs dust contained in the waste gas to form liquid drops, and the liquid drops are pushed into 12C-shaped recovery grooves 717, 727 and 12 negative pressure areas 7a inside and outside the concave collecting grooves 71C and 72C which are opened in different positions and in opposite directions of gas inflow by the horizontally inflowing waste gas along the inner plate wall of the gas filtering channel 73; at this time, the intercepted or recovered droplets containing dust in 24 effective negative pressure areas 7a inside and outside the 12C-shaped recovery grooves 717 and 727 and the 12 concave type collecting grooves 71C and 72C settle or are stored along the plate walls in the effective negative pressure areas 7a inside and outside the C-shaped recovery grooves 717 and 727 and the concave type collecting grooves 71C and 72C by the self weight; the C-shaped recovery grooves 717, 727 and the concave collecting grooves 71C, 72C arranged on the airflow filtering channel 73, the noise contained in the waste gas is silenced by using the sound wave of the noise, and the sound wave can play a role of retro-reflection and rebound in the wall of the airflow filtering channel 73 with a geometric structure, so that the noise of high, medium and low audio frequencies flowing into the airflow filtering channel 73 can be gradually weakened, the noise reduction and silencing effects are achieved, and the noise reduction capability can reach more than 23 decibels; the exhaust gases which have not been subjected to catalytic oxidation-reduction then flow into the fourth exhaust gas filtering and contacting device 8, and the exhaust gases are further treated.
A right upper semicircular baffle 83 and a right lower semicircular baffle 85 are respectively arranged in the fourth-stage waste gas purification and separation device 8, and metal broken wires 82 formed by cutting stainless steel materials arranged in the gap parts of the two sections form a plurality of spherical shapes; the inside of the right upper semicircular baffle cylindrical shell 81a and the right lower semicircular baffle cylindrical shell 81b are respectively provided with metal return wires 82 to form a plurality of spherical shapes as filtering contact carriers, the process flow that the inflowing waste gas forms a turbulent flow in the spherical shapes formed by the metal return wires 82, the waste gas rebounds and flows downwards after contacting with the right upper semicircular baffle 83, forms a turbulent flow in the spherical shapes formed by the metal return wires 82, and rebounds and flows upwards after contacting with the right lower semicircular baffle 85 is realized, the waste gas after generating the turbulent flow also performs overlapped catalytic oxidation reduction in the carriers, further has deep and wide surface area contact filtration, and repeatedly separates and purifies the waste gas.
When the exhaust gas passes through the inside of the fourth-stage exhaust gas purifying and separating device 8, namely, the inlet and outlet sections, and forms a plurality of spherical contact filtering with the metal return wire 82 formed by cutting the stainless steel material of the right upper semicircular baffle 83 and the right lower semicircular baffle 85, the exhaust gas is blocked by the right upper semicircular baffle 83 and the right lower semicircular baffle 85, and the metal return wire 82 forms a plurality of spherical filtering contact, the exhaust gas flows downwards and then flows upwards, and 2 effective negative pressure areas 8a are formed in back clearance areas of the right upper semicircular baffle 83 and the right lower semicircular baffle 85; at the waste gas outlet, the outlet pressure of the waste gas is increased, a plurality of balls formed by the metal return wires 82 are pushed out of the device, and the device is provided with a semicircular metal filter screen 13 and a semicircular round hole frame plate 14 which are used for protecting the plurality of balls formed by the metal return wires 82; thus, the waste gas containing harmful gas, dust and noise is subjected to catalytic oxidation reduction and filtering contact again, so that the waste gas which is completely subjected to separation purification and noise reduction treatment can flow through the outlet reducing pipeline 16 to be pressurized and then is discharged outwards along the waste gas outlet pipeline 17.
The waste gas purifier 1 is characterized in that a waste gas inlet pipeline 2 and a waste gas outlet pipeline 17 at two ends of an outer circular shell 4 are respectively provided with a water inlet pipeline 18 and a water outlet pipeline 20 for back washing, and the water inlet flow control valve 19 and the water outlet flow control valve 19 are connected; the purpose is to clean and remove the dust in 48 effective negative pressure areas 5a, 7a deposited in the gas filtering channels 53, 73 of the first stage exhaust gas catalytic oxidation reduction device 5 and the third stage exhaust gas catalytic oxidation reduction device after a period of time catalytic reduction, separation and purification of the exhaust gas by using high pressure water or urea liquid, in addition, in the gap between the round holes 65 of the round filtering rectification plate 62 arranged in the second stage exhaust gas filtering contact device 6, the back surface of the gas contact surface, in the gap area between the back surface of the right upper semicircular baffle 83 and the right lower semicircular baffle 85 arranged in the fourth stage exhaust gas purification separation device 8, in 3 effective negative pressure areas 6a, 8a, so as to prevent the dust from causing the blockage caused by the long-time accumulation in each gas filtering channel 53, 73, and may affect the purification treatment effect of the whole exhaust gas purifier 1, so that the exhaust gas purifier 1 may maintain good ventilation and treatment effects, and also have the functions of maintenance management and prolonging the service life thereof.
Because the exhaust gas discharged by the diesel engine contains hydrocarbons, carbon monoxide, nitrogen oxides, dust and noise, the exhaust gas is subjected to secondary catalytic oxidation and reduction, filtration and contact, separation and purification treatment in the first-stage exhaust gas catalytic oxidation reduction device 5, the second-stage exhaust gas filtration contact device 6, the third-stage exhaust gas catalytic oxidation reduction device 7 and the fourth-stage exhaust gas purification and separation device 8, the exhaust gas is only used as an object for absorbing dust, trapping, collecting and treating after being divided and separated, and the dust does not generate a plurality of spherical shapes formed by the geometric-structure gas filtration channels 5a and 7a and the metal return wires 67 and 82 formed by cutting stainless steel materials and used as a blocking phenomenon caused in the filtration contact carrier; when the exhaust gas flows through the gas filtering channels 53 and 73 in the first stage catalytic oxidation reduction device and the third stage catalytic oxidation reduction device to contact, inertia conflict occurs when the exhaust gas contacts with the plate walls in the gas filtering channels 53 and 73, the gas and 24 effective negative pressure areas 5a and 7a of C-shaped recovery grooves 517, 527, 717 and 727 and 24 concave collecting grooves 51C, 52C, 71C and 72C in different positions in the first stage catalytic oxidation reduction device 5 and the third stage catalytic oxidation reduction device 7 perform catalytic oxidation reaction and reduction reaction on the exhaust gas to form moisture, and the dust is separated and purified by utilizing the principle of moisture adsorption; the waste gas flows through the gaps among the wall thicknesses of the uniformly arranged circular holes 65, namely the back of the contact surface of the waste gas and the gas, on the circular filtering and rectifying plate 62 arranged in the second-stage waste gas filtering and contacting device 6, the uniform diameter of the circular holes 65 and the gap area among the backs of the right-side upper semicircular baffle 83 and the right-side lower semicircular baffle 85 arranged in the fourth-stage waste gas purifying and separating device 8, and in 3 effective negative pressure areas 6a and 8a, the waste gas is subjected to overlapped catalytic oxidation reduction and surface area contact filtration with depth and breadth, and the waste gas is repeatedly separated and purified, so that the separation and purification treatment can be completely obtained; the C-shaped recovery grooves 517, 527, 717, 727 and the concave collecting grooves 51C, 52C, 71C, 72C arranged on the airflow filtering channels 5a, 7a, the noise contained in the waste gas is silenced by using the sound wave of the noise, and the sound wave can play a role of retro-reflection and rebound in the walls 5a, 7a of the geometric-structure air filtering channels, so that the noise of high, medium and low frequencies flowing into the airflow filtering channels 5a, 7a can be gradually weakened, and the purposes of noise reduction and silencing are achieved; therefore, for the waste gas containing hydrocarbon, carbon monoxide, oxynitride, dust and noise, the catalytic oxidation reduction efficiency can reach more than 95%, the removal effect on dust PM2.5 can reach more than 90%, and the total effect of noise reduction and silencing can reach more than 45 decibels.
The invention has the advantages of obvious technical effect, simple, compact and reasonable structure; by implementing the process measures of pressure reduction and shunt separation on high-pressure waste gas, the noble metal three-way catalyst can perform catalytic oxidation reaction on hydrocarbon and carbon monoxide to form moisture and reduce oxynitride to form harmless gas of nitrogen and oxygen to be discharged under the high-temperature working condition, the principle that the moisture adsorbs dust and utilizes centrifugal force and negative pressure areas 5a, 6a, 7a and 8a is exerted, effective stable separation and high purification are implemented on the dust, noise can structurally obtain the sound wave retro-reflection and rebound effects, and the remarkable advantages of noise reduction and silencing effects are achieved.

Claims (3)

1. A waste gas purifier of a marine diesel engine is characterized by comprising an excircle shell;
the outer circle shell is internally provided with a waste gas inlet pipeline with a flange, an inlet reducing pipeline, a first-stage waste gas catalytic oxidation reduction device, a second-stage waste gas filtering and contacting device, a third-stage waste gas catalytic oxidation reduction device, a fourth-stage waste gas purifying and separating device, an outlet reducing pipeline and a waste gas outlet pipeline with a flange in sequence;
the inlet reducing pipeline is provided with a water inlet pipeline, the outlet reducing pipeline is provided with a water outlet pipeline, a water inlet flow control valve and a water outlet flow control valve;
a left circular grid piece and a right circular grid piece are arranged inside the first-stage waste gas catalytic oxidation reduction device and the third-stage waste gas catalytic oxidation reduction device, the left circular grid piece is a monomer component, and the thickness of the left circular grid piece is set to be 20-25 mm; the right circular grid plate is a single component and has the same thickness as the left circular grid plate; the outlet horizontal plane of the left circular grid sheet is combined with the inlet horizontal plane of the right circular grid sheet to form a concave collecting tank; the inner sides of the shells of the left circular grid piece and the right circular grid piece are on the same central line, and 4 inner side bolt holes which are at equal angles, are on the same circle and have the size of 18-22 mm are arranged; the first-stage exhaust gas catalytic oxidation reduction device and the third-stage exhaust gas catalytic oxidation reduction device are internally provided with the same airflow filtering channels, reinforcing ribs are arranged between the airflow filtering channels at equal intervals, and the left circular grid sheet and the right circular grid sheet are porous honeycombs;
a cylindrical shell is arranged in the second-stage waste gas filtering and contacting device, a circular filtering and rectifying plate with equal distance between round holes is arranged in the middle of the cylindrical shell, a central bolt hole is arranged in the central position of the circular filtering and rectifying plate, and bolt sleeves capable of penetrating through the central bolt hole are arranged in the central positions of the left side plane and the right side plane of the circular filtering and rectifying plate; one end of the reinforcing rib with the slope is intersected with the excircle of the bolt sleeve and is pasted on the circular filtering rectifying plate for welding and fixing, and the other end of the reinforcing rib is intersected on the excircles of 4 waist-shaped semicircular holes of the circular filtering rectifying plate for welding and fixing; using a plurality of balls formed by cutting stainless steel materials into metal broken wires as a filtering contact carrier, and coating a noble metal three-way catalyst on the surface of the carrier;
a right upper semicircular baffle cylindrical shell and a right lower semicircular baffle cylindrical shell are respectively arranged in the fourth-stage waste gas purification and separation device, 1 central threaded hole is formed in the center line of the right upper semicircular baffle, a central bolt hole is formed in the center line of the right lower semicircular baffle, and a plurality of balls formed by metal return wires are arranged between gaps in the right upper semicircular baffle cylindrical shell and the right lower semicircular baffle cylindrical shell; a semicircular metal filter screen is arranged at the opening of the semicircular baffle at the lower part of the right side.
2. The exhaust gas purifier of the marine diesel engine according to claim 1, wherein the thicknesses of the pipe walls of the exhaust gas inlet pipeline, the inlet variable diameter pipeline, the outlet variable diameter pipeline and the exhaust gas outlet pipeline are set to be 8-12 mm.
3. The exhaust gas purifier of a marine diesel engine according to claim 1, wherein two support frames are provided at a lower portion of the outer cylindrical casing, and two circular rings are provided at an upper portion of the outer cylindrical casing.
CN201610679360.8A 2016-08-16 2016-08-16 Exhaust gas purifier of marine diesel engine Active CN106390747B (en)

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