CN108380385B - Electrostatic and inertial coupling efficient dedusting and demisting integrated device and method - Google Patents
Electrostatic and inertial coupling efficient dedusting and demisting integrated device and method Download PDFInfo
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- CN108380385B CN108380385B CN201810420670.7A CN201810420670A CN108380385B CN 108380385 B CN108380385 B CN 108380385B CN 201810420670 A CN201810420670 A CN 201810420670A CN 108380385 B CN108380385 B CN 108380385B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 35
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- 238000005536 corrosion prevention Methods 0.000 claims description 9
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- 239000007921 spray Substances 0.000 claims description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
- B03C3/0175—Amassing particles by electric fields, e.g. agglomeration
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- 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
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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
- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
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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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to an electrostatic and inertial coupling efficient dedusting and demisting integrated device and method, which are vertically arranged above a spraying layer in a desulfurization absorption tower; the wet flue gas after being sprayed by the spraying layer enters a pre-dedusting and demisting device to remove fog drops and particles with larger particle sizes, and the flue gas continuously goes upwards to pass through a gas flow uniform distribution cooperative demisting plate, so that after the flow field entering a pre-charging system, the particle size field of the liquid drops and the particle concentration field are uniformly distributed, the flue gas enters the pre-charging system to promote the fog drops and fine particles in the flue gas to be condensed and grow after being charged; the charged fog drops and the particles are continuously aggregated and grown up due to the action of charges in the ascending under the action of electric field force and external field force, migrate to the enhanced demisting dust collecting plate, and are separated from the surface of the dust collecting plate under the action of inertia impact of smoke. Under the condition of frequent load fluctuation of the unit, the invention can realize the cooperative control of fine particles and fog drops with low resistance, low cost, low energy consumption, stability and high efficiency.
Description
Technical Field
The invention belongs to the technical field of pollution emission reduction of energy environmental engineering, and relates to an electrostatic and inertial coupling efficient dust and mist removal integrated device and method.
Background
At present, although high-efficiency dust removing equipment is configured in coal-fired power plants in China, the furnace type and capacity of coal-fired units in China are varied, the coal quality is complex, the design pertinence of dust removing technical equipment is not strong, the difference of fine particulate matter emission characteristics is large, and the technology and equipment for ultra-low particulate matter emission are key to restrict the deep emission reduction of particulate matters in heavy dust haze weather in winter, and high-efficiency, stable and reliable particulate matter ultra-low emission technology and equipment meeting the requirement of environmental air quality management are needed.
The flue gas after wet desulfurization of the coal-fired power plant contains a large amount of acid mist, gypsum particles and a small amount of other heavy metal particles, so that corrosion to subsequent equipment is avoided, pollution to the surrounding environment is caused, and the thermal power plant is provided with a desulfurization demister in a wet desulfurization absorption tower. The baffle type demister is a common inertial particulate removal device, and particles are removed from main air flow by utilizing the turning of a dust-containing air flow passage, so that the purpose of dedusting and demisting is achieved, but the effect of removing fine particles, especially submicron particles, is poorer, and meanwhile, when the flue gas flow rate is lower, the demisting and dedusting effect of the baffle type demister is obviously reduced, so that the demisting effect is difficult to ensure when a unit runs under low load.
Wet electrostatic precipitator can realize smoke and dust emission concentration<10mg/Nm 3 In particular, can realize<5mg/Nm 3 The device has certain removing capacity for liquid drops, but the system is relatively complex, and the investment cost and the energy consumption are high.
Disclosure of Invention
In order to overcome the defects in the prior art and strengthen the removal of aerosol and fine particles, the invention provides an electrostatic and inertial coupling efficient dedusting and demisting integrated device and method which are suitable for frequent fluctuation of unit load, low resistance, low cost and low energy consumption.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides an electrostatic and high-efficient dust removal defogging integrated device of inertial coupling is including the pre-dedusting defogging device, the air current equipartition that set up in order in coordination defogging board, pre-charge system, reinforcing defogging dust collecting plate and spraying system, electrostatic and high-efficient dust removal defogging integrated device of inertial coupling adopts vertical arranging in the desulfurizing absorption tower.
Preferably, the pre-dedusting and demisting device is provided with one stage or multiple stages and is positioned above a spraying layer in the desulfurization absorption tower; the pre-dedusting and demisting device is one or more of a baffle type demister, a ridge type demister or a tubular demister; the blades of the pre-dedusting and demisting device are streamline or broken line type. The blade can be made of stainless steel (316L, 2205 and the like) or polymer materials (FRP, PP); the pre-dedusting and demisting device mainly promotes flue gas to be uniformly distributed and intercepts large fog drops exceeding 5 microns, and has the pretreatment function on the fog drops and dust, and slurry fog drops with the volume ratio of 85-95% are effectively separated.
Preferably, the air flow uniform distribution cooperative demisting plate is positioned at a position 1-2 meters above the pre-dedusting demisting device; the air flow uniform distribution cooperative demisting plate is composed of a porous plate and a porous plate supporting beam, the porous plate is formed by horizontally splicing a plurality of groups of porous plate components, the porous plate components are connected through reinforcing ribs for strengthening strength, the aperture ratio of the porous plate is 30-35%, the thickness of the porous plate is 1-5 mm, and the aperture is 15-50 mm; the porous plate supporting beam is formed by arranging rectangular pipes in a groined shape on the same plane, the wall thickness of the rectangular pipes is 6-15 mm, the surfaces of the rectangular pipes are subjected to corrosion prevention treatment by adopting glass flakes, stress releasing air holes are formed in the connecting positions and the two ends of the porous plate supporting beam, and the aperture of the air holes is 15-25 mm.
The porous plate is made of 2205 or 2507, the rectangular tube is made of carbon steel, the uniform distribution of air flow and the cooperation of the demisting plates mainly promote the uniform distribution of air flow, so that the flow field entering the pre-charge system, the particle size field of liquid drops and the concentration field of particulate matters are uniformly distributed, the condensation growth of fine particulate matters and fine mist drops is promoted, and meanwhile, a part of liquid drops and fine particulate matters are removed by means of collision.
Preferably, the air flow uniform distribution cooperative demisting plate comprises a porous plate, wherein the porous plate is formed by splicing a plurality of groups of porous plate components at 120-135 degrees, the porous plate components are of rectangular structures, the aperture ratio of the porous plate is 30-35%, the thickness is 1-5 mm, and the aperture is 15-50 mm; the pre-dedusting and demisting device and the air flow uniform distribution cooperative demisting plate share a set of supporting frame; the support frame is formed by arranging two rectangular pipes in parallel on the same plane, wherein the wall thickness of each rectangular pipe is 6-15 mm, and the surfaces of the rectangular pipes are subjected to corrosion prevention treatment by adopting glass flakes.
Preferably, the pre-charge system is positioned 0.2-0.8 m above the air flow uniform distribution cooperative defogging plate and consists of an electrode fixing assembly, a corona electrode, an electrode supporting beam, an electric system and an insulation box hot air purging system, and the pre-charge system utilizes the corona electrode to discharge to charge fog drops and fine particles, so that the fine fog drops and the fine particles are promoted to be condensed and grow up by the charging, and the subsequent removal is facilitated;
the electrode fixing component is formed by welding an annular circular tube, a plurality of linear circular tubes and a fixed bottom plate or by splicing a plurality of linear electrode supporting beams and is horizontally arranged on the same plane in the desulfurization absorption tower, and the circular tubes and the fixed bottom plate are made of stainless steel (316L or 2205 and the like); the electrode fixing component forms a frame for fixing the corona electrode and is used for forming a discharge passage and preventing the corona electrode from shaking caused by air flow impact;
the corona electrode is horizontally fixed on the bottom plate and consists of a plurality of circular tube type single-sided needle threads, and needle points of the needle threads are arranged opposite to the flow direction of the flue gas; the spacing between the circular tube type single-sided needle-shaped lines is 250-300 mm, and the corona electrode material can be made of stainless steel materials (316L or 2205 and the like);
the electrode supporting beam is arranged above or below the electrode fixing assembly, the electrode supporting beam adopts a rectangular pipe, the material can be carbon steel, the surface of the electrode supporting beam adopts glass flakes for corrosion prevention treatment, and both ends of the electrode supporting beam are provided with air holes for releasing stress and observing corrosion leakage;
the electric system comprises a power supply and an insulator, and a high-frequency superimposed pulse high-efficiency power supply is adopted as a discharge electrode power supply of the electric system;
the hot air purging system of the insulation box comprises an insulation cylinder, an electric heater and a hot air pipe, and is used for preventing the insulator from dewing to cause electrode short circuit or creepage.
Preferably, the pre-charging system consists of an electrode fixing assembly, a corona electrode, an electrical system and an insulation box hot air blowing system, wherein the electrode fixing assembly is formed by splicing a plurality of linear circular tubes, the electrode fixing assembly is horizontally arranged on the same plane of a desulfurization absorption tower, the wall thickness of each linear circular tube is 5-15 mm, and the surface of each linear circular tube is subjected to corrosion-resistant treatment by adopting glass flakes; the corona electrodes are formed by splicing circular tube type single-sided needle-shaped wires at 120-135 degrees in sequence, are arranged in parallel with the porous plate, and the interval between adjacent corona electrodes on the same plane is 200-400 mm; the circular tube type single-sided needle-shaped line needle points are arranged against the flow direction of the smoke.
Preferably, the integrated device further comprises a multi-field uniform distribution cooperative defogging dust collection plate, and the multi-field uniform distribution cooperative defogging dust collection plate is positioned at a position 0.2-0.8 m above the corona electrode; the parameter arrangement form of the multi-field uniform distribution cooperative defogging dust collection plates is the same as that of the air flow uniform distribution cooperative defogging plates;
the reinforced demisting dust collection plate is provided with one stage or multiple stages, and is positioned 0.1-1.5 m above the multi-field uniformly distributed cooperative demisting dust collection plate; the reinforced demisting dust collection plates are baffle type or ridge type demisters, the blades of the reinforced demisting dust collection plates are of a folded line type, the blades are arranged in parallel, and the blade spacing is 20-100 mm; the height of the blade is 150-400 mm, and the inclination angle is 45-60 degrees.
The multi-field uniformly distributed cooperative demisting dust collection plate mainly promotes uniform air flow distribution and uniform electric field distribution of charged liquid drops/particles, promotes condensation and growth of fine particles and fine mist drops, and simultaneously removes a part of liquid drops and fine particles by collision. Stainless steel (316L, 2205 and the like) can be adopted as the reinforced defogging dust collecting plate blade; carrying out charging after fine particles and fog drops in the flue gas pass through a pre-charging system, strengthening condensation growth of the fog drops, enabling the fog drops after condensation growth to further adsorb the fine particles, and enabling the fine particles after charging to further agglomerate and grow into particles with larger particle sizes; and the negatively charged liquid drops and particles migrate to the enhanced demisting dust collection plate under the action of electric field force, and the charged liquid drops and particles are trapped by the dust collection plate.
Preferably, the spraying system is composed of a spraying main pipe, a spraying branch pipe and a nozzle, wherein the spraying main pipe is arranged along the outer side wall surface of the desulfurization absorption tower and extends to the vicinity of the pre-dedusting and demisting device, the multi-field uniform distribution cooperative demisting dust collection plate and the air flow uniform distribution cooperative demisting plate; the spraying branch pipe consists of a plurality of branch pipes and is respectively connected with the spraying main pipe; the spray branch pipes are distributed above and below the pre-dedusting and demisting device and the reinforced demisting dust collection plate, and above the multi-field uniformly distributed cooperative demisting dust collection plate and the air flow uniformly distributed cooperative demisting plate; the spray nozzles are connected with the spray branch pipes and are uniformly distributed on the surface of the device; the spraying system adopts an intermittent and layered operation flushing mode, and the spraying systems on the upper surface and the lower surface of the pre-dedusting and demisting device adopt 20L/min and 6 times/d; the upper surfaces of the air flow uniform distribution cooperative defogging plate and the multi-field uniform distribution cooperative defogging dust collection plate are sprayed and washed for 10L/min and 3 times/d; the upper and lower parts of the reinforced demisting dust collection plates are 10L/min and 2 times/d.
An integrated method for high-efficiency dedusting and demisting by electrostatic and inertial coupling comprises the following steps:
(1) The wet flue gas after desulfurization dust collection treatment of the spray layer in the desulfurization absorption tower enters a pre-dedusting and demisting device to perform pretreatment on fog drops and dust, and the concentration of the fog drops is controlled to be lower than 75mg/Nm 3 ；
(2) The flue gas continuously ascends through the gas flow uniform distribution cooperative demisting plates, so that the flow field, the fog drops and the particulate matters are uniformly distributed, and larger liquid drops and particulate matters are trapped;
(3) The flue gas with uniformly distributed flow field, fog drops and particles enters a pre-charge system, and a high-frequency superimposed pulse high-efficiency power supply applies stable high voltage to enable an electrode to perform corona discharge, so that the fog drops and fine particles in the flue gas are charged;
(4) The charged fog drops and the particles are condensed and aggregated to grow up due to the action of electric field force and external field force in the continuous ascending process, migrate to the enhanced demisting dust collection plate, adhere to the surface of the dust collection plate to form a liquid film under the action of inertia impact of smoke, move forward to the turning position of the dust collection plate along with the airflow, and are separated from the surface of the dust collection plate due to the absorption effect and the surface tension of the liquid due to the turning centrifugal force and the friction effect of the dust collection plate, and the non-removed fog drops are continuously separated at the subsequent turning position through the same effect.
Preferably, the charged fog drops and the particles are treated by the multi-field uniformly distributed cooperative defogging dust collection plate before being transferred to the enhanced defogging dust collection plate.
The working principle of the electrostatic and inertial coupling efficient dust and mist removal integrated method is as follows:
wet flue gas after desulfurization dust collection treatment of a spray layer in the desulfurization absorption tower enters the pre-dedusting and demisting device, the pre-dedusting and demisting device has the pre-treatment effect on fog drops and dust, fog drops and particulate matters with larger particle size can be removed, and the concentration of the fog drops is controlled to be lower than 75mg/Nm 3 The method comprises the steps of carrying out a first treatment on the surface of the The flue gas continuously goes upward to pass through the air flow uniform distribution cooperative demisting plate to promote the air flow uniform distribution, so that the flow field entering the pre-charge system, the particle size field of liquid drops and the particle concentration field are uniformly distributed, when the flue gas passes through the holes of the porous plate along with the air flow, the liquid drops become larger due to the friction effect of the holes and the surface tension of liquid, the condensation growth of fine particles and fine mist drops is promoted, and then the larger liquid drops and the larger particles are trapped; the flue gas with uniform distribution of flow fields, fog drops and particles enters the pre-charge system, the high-frequency superposition pulse high-efficiency power supply applies stable high voltage to enable the electrode to be subjected to corona discharge, so that the fog drops and fine particles in the flue gas are charged, the charged fog drops and the particles are condensed and grow up, the flue gas ascends to the multi-field uniform distribution cooperative defogging dust collection plate under the action of an electric field force, the uniform distribution of air flow and the uniform distribution of charged liquid drops/particles are promoted, the liquid drops are enlarged due to the friction and adsorption effects of holes and the surface tension of liquid, the condensation growth of the fine particles and the fine fog drops is promoted, and larger liquid drops and particles are captured; charged mist and particulate matter is electrically chargedUnder the action of field force and external field force, charged particles and fog drops continuously flow upward to form a liquid film on the surface of the baffle plate under the action of inertia impact of smoke, and the liquid film moves forward to the turning position of the dust collecting plate along with the airflow.
The invention has the beneficial effects that:
(1) Under the action of an electrostatic field, the charges, the coagulation, the growth and the migration of fine particles and fine mist drops are carried out, so that the fine particles and the mist drops are effectively removed, the load adaptability is high, and the demisting and dust collecting effects in a wide particle size range are realized;
(2) The flue gas flows from bottom to top, is integrated and compactly arranged in the desulfurization absorption tower, and saves the field;
(3) The high-frequency superimposed pulse high-efficiency power supply is used as the corona electrode power supply, so that the corona discharge effect can be obviously improved, and the capturing efficiency of fine particles can be obviously improved; the power supply has the advantages of higher power supply efficiency, lower energy consumption of the power supply, high discharge intensity and the like;
(4) The structure is simple and convenient, the streamline arrangement and the circular tower are internally provided with fewer flow guide components, and a flue and an outer frame are saved, so that the system resistance is greatly reduced, and compared with the conventional wet electrostatic precipitator, the resistance is reduced by 100-200 Pa;
(5) The resistance is reduced, so that the power consumption of the induced draft fan is reduced, and the energy consumption is reduced by more than 10%;
(6) Compared with the conventional wet electrostatic precipitator, the investment of an outer frame of a reaction device, a device foundation, a supporting frame and a corresponding water treatment system is reduced by more than 40 percent;
(7) The concentration of particles at the inlet of the desulfurization absorption tower is lower than 30mg/Nm 3 When the particle emission concentration is lower than 5mg/Nm, the particle emission concentration can be stably realized under all working conditions 3 At least as low as 3mg/Nm 3 The following are set forth; the content of fog drops is lower than 20mg/Nm 3 For a pair ofThe method has great advantages in environmental protection, efficiency improvement and transformation of the old unit with limited arrangement space.
Drawings
FIG. 1 is a sectional view of the structure of an electrostatic and inertial coupling efficient dust and mist removal integrated device according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of the structure of a porous plate of example 1;
FIG. 3 is a schematic view showing the structure of a support beam for a perforated plate according to example 1;
fig. 4 is a schematic structural view of an electrode fixing assembly according to embodiment 1;
fig. 5 is a schematic structural view of a corona electrode of example 1;
FIG. 6 is a schematic view of the arrangement of corona electrodes of example 1;
FIG. 7 is a schematic view showing a corona electrode fixing structure of example 1;
FIG. 8 is a schematic diagram illustrating the connection between a corona electrode support beam and a circular tube in accordance with example 1;
FIG. 9 is a cross-sectional view of the structure of the electrostatic and inertial coupling high efficiency dust and mist removal integrated device of example 2;
FIG. 10 is a cross-sectional view of the structure of the electrostatic and inertial coupling high efficiency dust and mist removal integrated device of example 3;
FIG. 11 is a block diagram of an electrostatic and inertial coupling high efficiency dust and mist removal integrated apparatus of example 4;
FIG. 12 is a schematic view showing the structure of a pre-dedusting and demisting device and a reinforced demisting and dust collecting plate blade according to embodiment 4;
FIG. 13 is a schematic view of a multi-field uniform cooperative defogging dust collection plate and an air flow uniform cooperative defogging plate structure in example 4;
FIG. 14 is a schematic view of a corona electrode and electrode fixation assembly of example 4;
FIG. 15 is a block diagram of an integrated device for efficient electrostatic and inertial coupling dedusting and demisting in example 5;
fig. 16 is a structural diagram of an electrostatic and inertial coupling efficient dust and mist removal integrated device according to embodiment 6.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
Example 1
Referring to fig. 1 to 8, an electrostatic and inertial coupling efficient dedusting and demisting integrated device is vertically arranged in a desulfurization absorption tower and positioned above a spraying layer of the desulfurization absorption tower, and comprises a pre-dedusting and demisting device 2, an air flow uniform distribution cooperative demisting plate 3, a pre-charging system 11, a multi-field uniform distribution cooperative demisting dust collecting plate 22, a reinforced demisting dust collecting plate 23 and a spraying system 25 which are sequentially arranged;
the flue gas treated by the spraying layer 1 in the desulfurization absorption tower passes through a pre-dedusting and demisting device 2, wherein the pre-dedusting and demisting device 2 is a ridge type demister, and the blades of the ridge type demister are made of pp materials; after passing through the pre-dedusting and demisting device 2, on one hand, the flue gas uniform distribution is promoted, meanwhile, fog drops and particulate matters with larger particle size can be removed, and the concentration of the fog drops is controlled to be lower than 75mg/Nm 3 ；
The flue gas treated by the pre-dedusting and demisting device 2 continuously goes upward for 1.5 meters and enters the air flow multi-field uniform distribution cooperative demisting plate 3; the air flow uniform distribution cooperative demisting plate 3 consists of a porous plate 4 and a porous plate supporting beam 5; the porous plate 4 is formed by horizontally splicing a plurality of groups of porous plate components 6, and reinforcing ribs 7 for strengthening the strength are arranged between the components for connection; the aperture ratio of the porous plate 4 is 32%, the thickness is 2mm, and the aperture is2205 is made of materials; the supporting beam 5 of the porous plate is formed by arranging rectangular pipes 9 in a groined shape on the same plane, the wall thickness of the rectangular pipes 9 is 8mm, the material is carbon steel, and the surface is subjected to corrosion prevention treatment by adopting glass flakes; the connecting part and two ends of the porous plate supporting beam 5 are provided with stress-releasing air holes 10, and the diameter of the air holes 10 is +.>The uniform distribution of the air flow and the cooperation of the demisting plates 3 promote the uniform distribution of the flow field, the particle size field of the liquid drops and the concentration field of the particulate matters of the pre-charge system 11, promote the condensation growth of the fine particulate matters and the fine mist drops, and remove a part of the liquid drops and the fine particulate matters by means of collision.
The pre-charge system 11 is positioned 0.6 m above the air flow uniform distribution cooperative demisting plate 3; the device consists of an electrode fixing assembly 12, a corona electrode 13, an electrode supporting beam 14, an electrical system 15 and an insulation can hot air purging system 16; the pre-charging system 11 charges the mist drops and the fine particles by utilizing the discharge of the corona electrode 13, and the charging promotes the condensation and growth of the fine mist drops and the fine particles so as to facilitate the subsequent removal.
The electrode fixing assembly 12 is formed by welding an annular circular tube 17, a plurality of linear circular tubes 18 and a fixing bottom plate 19, and is horizontally arranged on the same plane in the desulfurization absorption tower 1; the electrode fixing assembly 12 is fixedly hung below the supporting beam 14 by adopting a pipe clamp 20; the annular circular tube 17, the plurality of linear circular tubes 18 and the fixed bottom plate 19 are made of 316L; the electrode fixing assembly 12 constitutes a frame for corona electrode fixation for forming a discharge path while preventing shaking of the corona electrode caused by air flow impact. The corona electrode 13 is horizontally fixed on the fixed bottom plate 19; the corona electrode 13 consists of a plurality of circular tube type single-sided needle-shaped wires 21, the needle tips are arranged opposite to the flow direction of the flue gas, the distance between the single-sided needle-shaped wires 21 is 280mm, and the corona electrode material is 316L.
The electrode supporting beam 14 is arranged above the electrode fixing assembly 12 and is connected with round tubes 17 and 18 in the electrode fixing assembly 12 by adopting a tube clamp 20; the electrode support beam 14 is a rectangular pipe with the pipe wall thickness of 10mm, is made of carbon steel, and is subjected to corrosion-resistant treatment by adopting glass flakes on the surface.
The discharge electrode power supply of the electric system 15 adopts a high-frequency superimposed pulse high-efficiency power supply, and the hot air purging system 16 of the heat preservation box mainly prevents the insulator from dewing, so that the electrode is short-circuited or climbs.
The multi-field uniform distribution cooperative defogging dust collection plate 22 and the air flow uniform distribution cooperative defogging plate 3 are identical in structure and are positioned at the position 0.3 m above the electrode fixing assembly 12.
The enhanced demisting dust collection plate 23 is provided with a first stage and is positioned 0.3 m above the multi-field uniformly distributed cooperative demisting dust collection plate 22; the blades 24 of the reinforced demisting dust collection plate 23 are of a folded line type; blades 24 are hook-type baffle plates, the blade spacing is 30mm, the blade height is 300mm, the inclination angle is 45 degrees, and the blade material is 316L; after fine particles and fog drops in the flue gas pass through a pre-charging system 11, charging is carried out, the condensation growth of the fog drops is enhanced, the fog drops after condensation growth further adsorb the fine particles, and meanwhile, the charged fine particles can further agglomerate and grow into particles with larger particle sizes; the negatively charged droplets and particles reach the enhanced mist and dust collection plate 23 due to the electric field force, and the charged droplets and particles are trapped by the baffle plate.
The spraying system 25 is respectively arranged on the upper surface and the lower surface of the pre-dedusting and demisting device 2 and the upper surface and the lower surface of the reinforced demisting and dust collecting plate; the spraying system 25 adopts an intermittent and hierarchical operation flushing mode; the spraying systems on the upper surface and the lower surface of the pre-dedusting and demisting device adopt 20L/min and 6 times/d; the upper surfaces of the air flow uniform distribution cooperative defogging plate and the multi-field uniform distribution cooperative defogging dust collection plate are sprayed and washed for 10L/min and 3 times/d; the upper part and the lower part of the reinforced demisting dust collection plate are 10L/min and 2 times/d; the end of the main pipe of the spraying system adopts a nozzle, and a corresponding blind plate is not adopted for plugging.
The electrostatic and inertial coupling high-efficiency dust-removing and demisting integrated device is integrally arranged in the desulfurization absorption tower, a flue is not required to be additionally arranged to guide flue gas into the device, no complicated flow guiding component is needed, compared with the conventional wet electrostatic precipitator, the resistance is reduced by 120Pa, and the power consumption of the induced draft fan is reduced due to the reduction of the resistance; the high-frequency superimposed pulse power supply has high efficiency, less power consumption, high discharge intensity and 12% reduction in comprehensive energy consumption; compared with the conventional wet electrostatic precipitator, the investment of an outer frame of a reaction device, a device foundation, a supporting frame and a corresponding water treatment system is reduced by more than 40 percent; under the actions of high-efficiency stable power supply, multi-path and multi-stage reinforced particulate matter/liquid drop charge, agglomeration, growth and directional migration, when the smoke dust concentration at the inlet of the desulfurization absorption tower is less than or equal to 20mg/Nm 3 When the smoke content in the smoke is less than or equal to 3mg/Nm 3 The content of fog drops is lower than 20mg/Nm 3 。
Example 2
Referring to FIG. 9, to further reduce the smoke content, based on example 1, two stages of enhanced demisting and dust collecting plates were used at a pitch of 0.5 m so that the smoke content in the smoke was 5mg/Nm or less 3 The content of fog drops is lower than 20mg/Nm 3 Compared with a system adopting a wet electrostatic precipitator conventionallyCompared with the resistance reduced by 80Pa, the energy consumption is reduced by more than 10 percent.
Example 3
Referring to FIG. 10, on the basis of example 1, the multi-field uniform distribution cooperative demisting dust collection plate is not arranged, so that the resistance of the system is further reduced, the energy consumption is reduced by 13%, and the smoke dust content in the smoke is less than or equal to 5mg/Nm 3 The content of fog drops is lower than 20mg/Nm 3 。
Example 4
Referring to fig. 11 to 14, the electrostatic and inertial coupling efficient dust and mist removing integrated device of the present embodiment is vertically disposed in the desulfurizing absorption tower and above the spraying layer of the desulfurizing absorption tower.
The flue gas treated by the spraying layer in the desulfurization absorption tower passes through a pre-dedusting and demisting device 2, wherein the pre-dedusting and demisting device 2 is a high-efficiency baffle type demister, and the blades 24 of the high-efficiency baffle type demister 2 are made of pp materials; after passing through the pre-dedusting and demisting device 2, on one hand, the flue gas uniform distribution is promoted, meanwhile, fog drops and particulate matters with larger particle size can be removed, and the concentration of the fog drops is controlled to be lower than 75mg/Nm 3 ；
The flue gas treated by the pre-dedusting and demisting device 2 enters an air flow uniform distribution cooperative demisting plate 3; the air flow uniform distribution cooperative demisting plate comprises a porous plate 4, wherein the porous plate is formed by sequentially splicing a plurality of groups of porous plate assemblies 6 at 120 degrees, the porous plate assemblies are of rectangular structures, the aperture ratio of the porous plate is 32%, the thickness is 3mm, and the aperture is 40mm; the pre-dedusting and demisting device 2 and the air flow uniform distribution cooperative demisting plate 3 share a set of supporting frame 26; the supporting frame 26 is formed by arranging two rectangular pipes in parallel on the same plane, the wall thickness of each rectangular pipe is 12mm, and the surfaces of the rectangular pipes are subjected to corrosion prevention treatment by adopting glass flakes. The uniform distribution of the air flow and the cooperation of the demisting plates 2 promote the uniform distribution of the flow field, the particle size field of the liquid drops and the concentration field of the particulate matters of the pre-charge system 11, promote the condensation growth of the fine particulate matters and the fine mist drops, and remove a part of the liquid drops and the fine particulate matters by means of collision.
The lower bottom surface of the pre-charge system 11 is positioned 0.3 m above the upper surface of the air flow uniform distribution cooperative demisting plate 2; the device consists of an electrode fixing assembly 12, a corona electrode 13, an electrical system 15 and an insulation can hot air purging system 16; the electrode fixing assembly 12 is formed by splicing a plurality of linear circular tubes, the linear circular tubes are horizontally arranged on the same plane of the desulfurization absorption tower, the wall thickness of each linear circular tube is 8mm, the material is carbon steel, and the surface of each linear circular tube is subjected to corrosion prevention treatment by adopting glass flakes; the electrode fixing assembly 12 constitutes a frame for corona electrode fixation for forming a discharge path while preventing shaking of the corona electrode caused by air flow impact.
The corona electrodes 13 are formed by mutually and sequentially splicing circular tube type single-sided needle-shaped wires at 120-135 degrees, are arranged in parallel with the porous plate, and the interval between adjacent corona electrodes on the same plane is 300mm; the circular tube type single-sided needle-shaped wire needle tip is arranged against the smoke flow direction, and the corona electrode material is 316L.
The pre-charging system 11 charges the mist drops and the fine particles by utilizing the discharge of the corona electrode 13, and the charging promotes the condensation and growth of the fine mist drops and the fine particles, so that the subsequent removal is facilitated.
The discharge electrode power supply of the electric system 15 adopts a high-frequency superimposed pulse high-efficiency power supply, and the hot air purging system 16 of the heat preservation box mainly prevents the insulator from dewing, so that the electrode is short-circuited or climbs.
The multi-field uniform distribution cooperative defogging dust collection plate 22 and the air flow uniform distribution cooperative defogging plate 2 are identical in structure and are positioned at the position 200mm above the corona electrode in parallel.
The reinforced demisting dust collection plate 23 is provided with a first stage and is positioned above the multi-field uniformly distributed cooperative demisting plate 22 for 1.0 meter in parallel; the blades 24 of the reinforced demisting dust collection plate 23 are in a folded line shape, the blades are arranged in parallel, the distance is 100mm, the inclination angle is 45 degrees, and the blades are 316L; after fine particles and fog drops in the flue gas pass through a pre-charging system 11, charging is carried out, the condensation growth of the fog drops is enhanced, the fog drops after condensation growth further adsorb the fine particles, and meanwhile, the charged fine particles can further agglomerate and grow into particles with larger particle sizes; the negatively charged droplets and particles reach the enhanced demisting dust collection plate 23 due to the electric field force, and the charged droplets and particles are captured by the baffle.
The spraying system 25 is respectively arranged on the upper surfaces of the pre-dedusting and demisting device 2 and the multi-field uniformly distributed cooperative demisting dust collection plate 22, and the upper and lower surfaces of the demisting dust collection plate 23 are reinforced; the spraying system 25 adopts an intermittent and hierarchical operation flushing mode; the spraying systems on the upper surface and the lower surface of the baffle type demister in the pre-dedusting demister 2 respectively adopt 20L/min and 6 times/d; the upper surface of the multi-field uniformly distributed cooperative demisting dust collection plate 22 and the upper and lower surfaces of the reinforced demisting dust collection plate 23 adopt 10L/min for 2 times/d; the end of the main pipe of the spraying system adopts a nozzle, and a corresponding blind plate is not adopted for plugging.
By adopting the electrostatic and inertial coupling efficient dust and mist removing integrated device of the embodiment, when the smoke concentration at the inlet of the desulfurization absorption tower is less than or equal to 15mg/Nm 3 When the smoke content in the smoke is less than or equal to 4mg/Nm 3 The content of fog drops is lower than 15mg/Nm 3 Compared with a system adopting a conventional wet electrostatic precipitator, the resistance is reduced by 200Pa, and the energy consumption is reduced by 15%.
Example 5
Referring to fig. 15, on the basis of example 4, the multi-field uniform distribution cooperative demisting dust collection plate 22 is not provided, meanwhile, the reinforced demisting dust collection plate 23 is moved down by 200mm as a whole, the porous plate assemblies 6 are formed by sequentially splicing 135 degrees with each other, the corona electrodes 13 are formed by sequentially splicing 135 degrees with each other, the blades 24 of the reinforced demisting dust collection plate 23 are in a folded line shape, the blades are arranged in parallel, the distance is 100mm, the inclination angle is 45 degrees, so that the resistance of the system is further reduced, the energy consumption is reduced by 16%, the arrangement height can be reduced, and the smoke dust content in smoke is stably reduced to be less than or equal to 4mg/Nm 3 The content of fog drops is lower than 20mg/Nm 3 。
Example 6
Referring to FIG. 16, on the basis of example 5, a first stage enhanced demisting and dust collecting plate 23 is added to form a two stage enhanced demisting and dust collecting plate, the distance between the two stage enhanced demisting and dust collecting plates is 1.5 m, and the smoke dust content in the smoke is less than or equal to 3mg/Nm stably 3 The content of fog drops is lower than 20mg/Nm 3 。
In other embodiments, the pre-dedusting and demisting device can be a ridge demister, the material can be stainless steel metal, and the pre-dedusting and demisting device can be arranged in multiple stages within the range of controllable induced draft fan allowance, so that the pressure in the subsequent electrostatic-inertial treatment process is reduced, and the efficient demisting and dust collecting effect of the system is further ensured.
Claims (8)
1. An electrostatic and inertial coupling high-efficient dust removal defogging integrated device, its characterized in that: the integrated device comprises a pre-dedusting demister, an air flow uniform distribution cooperative demisting plate, a pre-charging system, a reinforced demisting dust collecting plate and a spraying system which are sequentially arranged, and the electrostatic and inertial coupling high-efficiency dedusting demisting integrated device is vertically arranged in a desulfurization absorption tower;
the air flow uniform distribution cooperative demisting plate is positioned at a position 1-2 meters above the pre-dedusting demisting device; the air flow uniform distribution cooperative demisting plate is composed of a porous plate and a porous plate supporting beam, the porous plate is formed by horizontally splicing a plurality of groups of porous plate components, the porous plate components are connected through reinforcing ribs for strengthening strength, the aperture ratio of the porous plate is 30-35%, the thickness of the porous plate is 1-5 mm, and the aperture is 15-50 mm; the porous plate supporting beam is formed by arranging rectangular pipes in a groined shape on the same plane, the wall thickness of the rectangular pipes is 6-15 mm, the surfaces of the rectangular pipes are subjected to corrosion prevention treatment by adopting glass flakes, stress releasing air holes are formed in the connecting positions and the two ends of the porous plate supporting beam, and the aperture of the air holes is 15-25 mm;
the air flow uniform distribution cooperative demisting plate comprises a porous plate, wherein the porous plate is formed by sequentially splicing a plurality of groups of porous plate components at 120-135 degrees, the porous plate components are of rectangular structures, the aperture ratio of the porous plate is 30-35%, the thickness is 1-5 mm, and the aperture is 15-50 mm; the pre-dedusting and demisting device and the air flow uniform distribution cooperative demisting plate share a set of supporting frame; the support frame is formed by arranging two rectangular pipes in parallel on the same plane, wherein the wall thickness of each rectangular pipe is 6-15 mm, and the surfaces of the rectangular pipes are subjected to corrosion prevention treatment by adopting glass flakes.
2. The electrostatic and inertial coupling efficient dedusting and demisting integrated device according to claim 1, wherein: the pre-dedusting and demisting device is positioned above a spraying layer in the desulfurization absorption tower and is one or more of a baffle type demister, a ridge type demister or a tubular demister.
3. The electrostatic and inertial coupling efficient dedusting and demisting integrated device according to claim 1, wherein: the pre-charge system is positioned 0.2-0.8 m above the air flow uniform distribution cooperative defogging plate and consists of an electrode fixing component, a corona electrode, an electrode supporting beam, an electrical system and an insulation box hot air purging system,
the electrode fixing component is formed by welding an annular circular tube, a plurality of linear circular tubes and a fixed bottom plate, and is horizontally arranged on the same plane in the desulfurization absorption tower, and the electrode fixing component forms a frame for fixing a corona electrode;
the corona electrode is horizontally fixed on the fixed bottom plate and consists of a plurality of circular tube type single-sided needle threads, and needle points of the needle threads are arranged opposite to the flow direction of the flue gas; the spacing between the circular tube type single-sided needle-shaped lines is 250-300 mm;
the electrode supporting beam is arranged above or below the electrode fixing assembly, the electrode supporting beam is a rectangular tube, the surface of the electrode supporting beam is subjected to corrosion prevention treatment by adopting glass flakes, and two ends of the electrode supporting beam are provided with air holes for releasing stress and observing corrosion leakage.
4. The electrostatic and inertial coupling efficient dedusting and demisting integrated device according to claim 1, wherein: the pre-charge system consists of an electrode fixing assembly, a corona electrode, an electrical system and an insulation box hot air purging system, wherein the electrode fixing assembly is formed by splicing a plurality of linear circular tubes, the electrode fixing assembly is horizontally arranged on the same plane of a desulfurization absorption tower, the wall thickness of each linear circular tube is 5-15 mm, and the surface of each linear circular tube is subjected to corrosion-resistant treatment by adopting glass flakes; the corona electrodes are formed by splicing circular tube type single-sided needle-shaped wires at 120-135 degrees in sequence, are arranged in parallel with the porous plate, and the interval between adjacent corona electrodes on the same plane is 200-400 mm; the circular tube type single-sided needle-shaped line needle points are arranged against the flow direction of the smoke.
5. The electrostatic and inertial coupling efficient dedusting and demisting integrated device according to claim 3 or 4, characterized in that: the integrated device further comprises a multi-field uniform-distribution cooperative defogging dust collection plate, and the multi-field uniform-distribution cooperative defogging dust collection plate is positioned at a position 0.2-0.8 m above the corona electrode; the parameter arrangement form of the multi-field uniform distribution cooperative defogging dust collection plates is the same as that of the air flow uniform distribution cooperative defogging plates;
the reinforced demisting dust collection plate is provided with one stage or multiple stages, and is positioned 0.1-1.5 m above the multi-field uniformly distributed cooperative demisting dust collection plate; the reinforced demisting dust collection plates are baffle type or ridge type demisters, the blades of the reinforced demisting dust collection plates are of a folded line type, the blades are arranged in parallel, and the blade spacing is 20-100 mm; the height of the blade is 150-400 mm, and the inclination angle is 45-60 degrees.
6. The electrostatic and inertial coupling efficient dedusting and demisting integrated device according to claim 5, wherein: the spraying system adopts an intermittent and layered operation flushing mode, and the spraying systems on the upper surface and the lower surface of the pre-dedusting and demisting device adopt 20L/min and 6 times/d; the upper surfaces of the air flow uniform distribution cooperative defogging plate and the multi-field uniform distribution cooperative defogging dust collection plate are sprayed and washed for 10L/min and 3 times/d; the upper and lower parts of the reinforced demisting dust collection plates are 10L/min and 2 times/d.
7. The electrostatic and inertial coupling efficient dedusting and demisting integrated method is characterized by comprising the following steps of:
(1) The wet flue gas after desulfurization dust collection treatment of the spray layer in the desulfurization absorption tower enters a pre-dedusting and demisting device to perform pretreatment on fog drops and dust, and the concentration of the fog drops is controlled to be lower than 75mg/Nm 3 ；
(2) The flue gas continuously ascends through the gas flow uniform distribution cooperative demisting plates, so that the flow field, the fog drops and the particulate matters are uniformly distributed, and larger liquid drops and particulate matters are trapped;
(3) The flue gas with uniformly distributed flow field, fog drops and particles enters a pre-charge system, and a high-frequency superimposed pulse high-efficiency power supply applies stable high voltage to enable an electrode to perform corona discharge, so that the fog drops and fine particles in the flue gas are charged;
(4) The charged fog drops and the particles are condensed and aggregated to grow up due to the action of electric field force and external field force in the continuous ascending process, migrate to the enhanced demisting dust collection plate, adhere to the surface of the dust collection plate to form a liquid film under the action of inertia impact of smoke, move forward to the turning position of the dust collection plate along with the airflow, and are separated from the surface of the dust collection plate due to the absorption effect and the surface tension of the liquid due to the turning centrifugal force and the friction effect of the dust collection plate, and the non-removed fog drops are continuously separated at the subsequent turning position through the same effect.
8. The electrostatic and inertial coupling efficient dedusting and demisting integrated method according to claim 7, is characterized in that: before the charged fog drops and particles migrate to the enhanced demisting dust collection plate, the fog drops and the particles are treated by the multi-field uniformly distributed cooperative demisting dust collection plate.
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| CN110585845A (en) * | 2019-10-18 | 2019-12-20 | 西安热工研究院有限公司 | Embedded electrostatic precipitator defroster |
| CN114345098B (en) * | 2022-01-10 | 2023-10-20 | 浙江大学嘉兴研究院 | CO (carbon monoxide) 2 Method and system for trapping absorbent decomposition inhibition and high-efficiency pollution reduction |
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