CN112827300B - Pressure leaching process tail gas treatment device and method - Google Patents
Pressure leaching process tail gas treatment device and method Download PDFInfo
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- CN112827300B CN112827300B CN202110008045.3A CN202110008045A CN112827300B CN 112827300 B CN112827300 B CN 112827300B CN 202110008045 A CN202110008045 A CN 202110008045A CN 112827300 B CN112827300 B CN 112827300B
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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
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
- F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
- F28F2009/226—Transversal partitions
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treating Waste Gases (AREA)
Abstract
The invention discloses a pressure leaching process tail gas treatment device and a method, wherein the device comprises a gas-gas heat exchanger, a washing device, a gas-liquid separator and an exhaust funnel; the gas-gas heat exchanger comprises a shell and a heat exchange tube, wherein the shell is a closed shell, the side wall of the upper part of the shell is provided with a gas outlet, the side wall of the lower part of the shell is provided with a high-pressure tail gas inlet, the heat exchange tube is arranged in the shell, the top end of the heat exchange tube is communicated with the exhaust funnel, and the bottom end of the heat exchange tube is communicated with the gas-liquid separator; the washing device comprises a plurality of stages of washers which are sequentially arranged from top to bottom, the input end of the top washer is communicated with the air outlet on the shell, the bottom washer comprises a circulating liquid outlet and a normal pressure tail gas inlet, and a liquid phase communicating pipe and a gas phase communicating pipe are arranged between the bottom washer and the gas-liquid separator. The high-pressure tail gas and the normal-pressure tail gas can be treated simultaneously, and the discharged tail gas is reheated, so that the formation of white fog is avoided; the tail gas before washing is cooled and condensed, and the tail gas amount entering the washing section is reduced, so that the diameter of the washing equipment can be reduced.
Description
Technical Field
The invention belongs to the technical field of chemical and metallurgical equipment, and particularly relates to a device and a method for treating tail gas in a pressure leaching process.
Background
The pressure leaching process belongs to the hydrometallurgy technology, and has the characteristics of high metal extraction rate, short process flow and the like for treating specific non-ferrous metal low-grade resources and associated mineral resources. The tail gas generated by the pressure leaching process can be divided into two types, one type is high-temperature pressurized mixed gas discharged from pressure containers such as a reaction kettle, a flash evaporation tank and the like, and the mixed gas mainly contains dirty steam, non-condensable gas, a small amount of (acidic) liquid drops and solid particles. The other is middle-high temperature normal pressure mixed gas discharged by normal pressure equipment such as a pulp configuration groove, and the mixed gas mainly contains dirty steam and a small amount of non-condensable gas. In order to ensure the emission reaching the standard, micro liquid drops, aerosol and solid particles carried by the tail gas are removed as far as possible before the tail gas is discharged, and the tail gas leaving the exhaust funnel does not generate obvious smoke plume. Meanwhile, the two types of tail gas generated by the pressure leaching process have different temperatures, pressures and components, and a targeted treatment strategy is adopted.
The traditional tail gas treatment system of the pressure leaching process is generally provided with a baffle plate washing tower, and the purpose of gas-liquid contact mass transfer is achieved by using tail gas to alternately penetrate through water curtains formed by washing liquid between baffle plates. However, the gas-liquid contact area and contact strength provided by the baffle plate washing tower are limited, and the effect of removing part of aerosol and solid particles in the tail gas is not good. Meanwhile, the high-pressure tail gas and the normal-pressure tail gas are sent into the washing tower from the same position, and the normal-pressure tail gas cannot be sent into the washing tower due to the fact that resistance at an inlet is increased. In addition, the moisture of the discharged tail gas is saturated, the temperature of the tail gas is not greatly different from the normal temperature, and the saturated vapor is easily condensed into smoke plume or liquid drops after the temperature of the tail gas is slightly reduced after the tail gas comes out of the exhaust funnel, so that white fog is formed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the device and the method for treating the tail gas in the pressure leaching process, which can treat the high-pressure tail gas and the low-pressure tail gas simultaneously and avoid the generation of white mist during discharge.
The invention provides a tail gas treatment device for a pressure leaching process, which comprises a gas-gas heat exchanger, a washing device, a gas-liquid separator and an exhaust funnel; the gas-gas heat exchanger comprises a shell and a heat exchange tube, wherein the shell is a closed shell, the side wall of the upper part of the shell is provided with a gas outlet, the side wall of the lower part of the shell is provided with a high-pressure tail gas inlet, the heat exchange tube is arranged in the shell, the top end of the heat exchange tube is communicated with the exhaust funnel, and the bottom end of the heat exchange tube is communicated with the gas-liquid separator; the washing device comprises a plurality of stages of washers which are sequentially arranged from top to bottom, the input end of the top washer is communicated with the air outlet on the shell, the bottom washer comprises a circulating liquid outlet and a normal pressure tail gas inlet, and a liquid phase communicating pipe and a gas phase communicating pipe are arranged between the bottom washer and the gas-liquid separator.
The shell is a cylindrical shell, a pair of tube plates are arranged in the shell, a plurality of through holes are formed in the tube plates, the inner cavity of the shell is divided into three cavities by the two tube plates, and the three cavities are an exhaust cavity, a heat exchange cavity and an air inlet cavity from top to bottom in sequence; the heat exchange tubes are coaxially arranged in the heat exchange cavity, the top ends of the heat exchange tubes are arranged in the through holes of the upper tube plate, and the bottom ends of the heat exchange tubes are arranged in the through holes of the lower tube plate.
A plurality of baffle plates are arranged in the heat exchange cavity, and pipe holes for the heat exchange pipes to pass through are formed in the baffle plates; an air inlet is arranged on the side wall of the bottom of the heat exchange cavity; an air inlet jacket is coated outside the bottom of the heat exchange cavity, a sewage discharge outlet is arranged at the bottom of the side wall of the air inlet jacket, and a tangential air pipe is arranged outside the air inlet jacket.
The washing device comprises a primary washer and a secondary washer, and the primary washer is coaxially arranged with the top of the secondary washer; the input end of the first-stage scrubber is communicated with the heat exchange cavity, and the output end of the first-stage scrubber is communicated with the second-stage scrubber.
The first-stage scrubber comprises a scrubbing section and a gas-liquid primary section which are communicated with each other, and the scrubbing section is coaxially arranged at the top of the gas-liquid primary section.
The washing section comprises a washing pipe, a top cover and a reverse spraying pipe, wherein both ends of the washing pipe are open, the upper part of the pipe wall is provided with a through hole communicated with the gas outlet of the gas-gas heat exchanger, the lower part of the pipe wall is provided with a through hole for installing the reverse spraying pipe, and the top cover seals the top opening of the washing pipe; the reverse spray pipe is an L-shaped pipe, the horizontal section of the reverse spray pipe is arranged along the radial direction of the washing pipe, and the vertical section of the reverse spray pipe is arranged along the axial direction of the washing pipe and is provided with an upward opening.
The gas-liquid primary section comprises a primary pipe, a bottom plate and a lower gas pipe, wherein both ends of the primary pipe are provided with openings, the bottoms of the side walls are provided with liquid discharge ports, the bottom plate is provided with gas holes, the bottom plate is connected to the opening at the bottom end of the primary pipe, and the lower gas pipe is connected to the inside of the gas holes and provided with liquid blocking caps at the tops.
The secondary scrubber comprises a washing cylinder and a spray pipe; the washing barrel comprises an upper gas phase section and a lower liquid phase section, the top end of the gas phase section is provided with an opening, the normal pressure tail gas inlet is arranged in the gas phase section, and the circulating liquid outlet is arranged in the liquid phase section; the spray pipe is arranged in the gas phase section.
The gas-liquid separator comprises an outer cylinder and a central cyclone cylinder; both ends of the central cyclone cylinder are open, the central cyclone cylinder is coaxially arranged in the outer cylinder, the top end of the central cyclone cylinder is communicated with the air inlet cavity of the heat exchanger, and the bottom end of the central cyclone cylinder is suspended in the air; the gas-phase communicating pipe is tangent to the outer cylinder.
The invention also provides a pressure leaching process tail gas treatment method, which comprises the following steps:
s.1, tangentially inputting high-pressure tail gas to be treated into a jacket of a gas-gas heat exchanger, rotating the high-pressure tail gas in the jacket at a high speed, removing partial entrained dirty liquid beads and solid particles, and carrying out primary impurity removal;
s.2, the high-pressure tail gas after primary impurity removal enters an inner cavity of the gas-gas heat exchanger from a gas inlet, moves from bottom to top and exchanges heat with the heat exchange tube;
s.3, feeding the high-pressure tail gas subjected to heat exchange into a primary scrubber, carrying out countercurrent contact with a washing liquid moving from bottom to top in a reverse spray pipe of the primary scrubber, cooling, carrying out primary purification, then feeding the washing liquid into a secondary scrubber, feeding normal-pressure tail gas into the secondary scrubber from the outside, mixing the two tail gases, and then carrying out spray washing and cooling again;
s.4, inputting the mixed tail gas after washing and cooling into a gas-liquid separator, performing gas-liquid separation by virtue of centrifugal force, discharging liquid after the gas-liquid separation, and enabling the gas meeting the exhaust standard to enter a heat exchange tube of a gas-gas heat exchanger to exchange heat with newly input untreated high-pressure tail gas;
and S.5, discharging the reheated body to be discharged through the exhaust funnel by heat exchange, so that the discharged gas is higher than the ambient temperature, and white fog is avoided.
When the tail gas is treated after being put into use, the high-pressure tail gas is input from the gas-gas heat exchanger, and the normal-pressure tail gas is input from the secondary scrubber. High-pressure tail gas is tangentially input into a jacket of the gas-gas heat exchanger and rotates at a high speed in the jacket to remove partial dirty liquid beads and solid particles, and impurities are removed for the first time; the high-pressure tail gas after primary impurity removal enters an inner cavity of the gas-gas heat exchanger from a gas inlet, moves from bottom to top and exchanges heat with the heat exchange tube; then the gas enters a primary scrubber, is in countercurrent contact with washing liquid moving from bottom to top in a reverse spray pipe of the primary scrubber, is subjected to temperature reduction and primary purification, then is input into a secondary scrubber to be mixed with normal-pressure tail gas, and is subjected to spray washing and temperature reduction again after being mixed; after washing and cooling, the gas enters a gas-liquid separator, after gas-liquid separation, the gas-liquid separation is completed by means of centrifugal force, liquid is discharged, and gas meeting the exhaust standard enters a heat exchange tube of a gas-gas heat exchanger to exchange heat with newly input untreated high-pressure tail gas; the exhaust gas is heated again and then discharged, so that the discharged gas is higher than the ambient temperature, and the formation of white mist is avoided.
Drawings
FIG. 1 is an assembly schematic of a preferred embodiment of the present invention.
FIG. 2 is an enlarged partial sectional view of the gas-gas heat exchanger and the gas-liquid separator in the preferred embodiment.
FIG. 3 is an enlarged schematic view, partially in section, of a primary scrubber in the preferred embodiment.
FIG. 4 is an enlarged partial sectional view of the secondary scrubber of the preferred embodiment.
Sequence numbers of the drawings:
1-a gas-gas heat exchanger,
11-shell, 111-exhaust cavity, 112-heat exchange cavity, 113-air inlet cavity, 114-high pressure tail gas inlet,
12-a heat exchange pipe,
13-a tube sheet,
14-a baffle plate, which is provided with a baffle plate,
15-air inlet jacket, 151-sewage outlet, 152-tangential air pipe;
2-a washing device for the washing of the fabric,
21-a first-stage washer, wherein,
211-washing section, 2111-washing pipe, 2112-top cover and 2113-counter-jet pipe,
212-gas-liquid primary section, 2121-primary section pipe, 2122-bottom plate, 2123-lower gas pipe, 2124-liquid discharge port, 2125-liquid blocking cap,
22-a secondary scrubber, 221-a washing cylinder, 222-a spray pipe, 223-a normal pressure tail gas inlet, 224-a circulating liquid outlet,
3-gas-liquid separator, 31-outer cylinder, 32-central cyclone;
4, an exhaust funnel; 5, passing through a trachea; 6-gas phase communicating pipe; 7-liquid phase communicating pipe.
Detailed Description
As shown in fig. 1, the pressure leaching process tail gas treatment device disclosed in this embodiment is composed of four parts, namely, a gas-gas heat exchanger 1, a washing device 2, a gas-liquid separator 3 and an exhaust stack 4.
As shown in fig. 2, the gas-gas heat exchanger 1 comprises a housing 11 and a plurality of heat exchange tubes 12 uniformly distributed in the housing. The shell 11 is a cylindrical shell, and a pair of tube plates 13 are arranged in the shell, a plurality of through holes are uniformly distributed on the tube plates, the inner cavity of the shell is divided into three cavities by the two tube plates, and an exhaust cavity 111, a heat exchange cavity 112 and an air inlet cavity 113 which are communicated with each other are sequentially arranged from top to bottom. A plurality of baffle plates 14 are arranged in the heat exchange cavity 112, and pipe holes for the heat exchange pipes to pass through are arranged on the baffle plates; a high-pressure tail gas inlet 114 is arranged outside the side wall of the bottom of the heat exchange cavity; the bottom of the heat exchange cavity is externally coated with an air inlet jacket 15, the bottom of the side wall of the air inlet jacket is provided with a sewage outlet 151, and a tangential air pipe 152 is externally arranged and communicated with the high-pressure tail gas inlet 114. The top of the exhaust cavity 111 is communicated with an exhaust funnel, and the upper side wall of the heat exchange cavity 112 is externally provided with a gas passing pipe 5 to be communicated with the washing device 2. The air intake chamber 113 extends into the gas-liquid separator 3.
As shown in fig. 1, the scrubber 2 is arranged in parallel with the gas-gas heat exchanger, and the scrubber 2 is composed of a primary scrubber 21 and a secondary scrubber 22.
As shown in fig. 3, the primary scrubber 21 includes a scrubbing section 211 and a gas-liquid primary section 212 which are communicated with each other, and the scrubbing section is coaxially disposed on the top of the gas-liquid primary section. The wash section 211 includes wash pipes 2111, a top cover 2112 and a counter spray pipe 2113. Both ends of the washing pipe 2111 are open, the upper part of the pipe wall is provided with a through hole communicated with the air outlet of the gas-gas heat exchanger through a gas passing pipe 5, the lower part of the pipe wall is provided with a through hole for installing a reverse spraying pipe 2113, and the top cover 2112 closes the top end opening of the washing pipe. The back spray pipe 2113 is an L-shaped pipe, the horizontal section of which is arranged along the radial direction of the washing pipe, and the vertical section of which is arranged along the axial direction of the washing pipe and has an upward opening. The gas-liquid primary section 212 includes a primary tube 2121, a bottom plate 2122 and a lower gas tube 2123, both ends of the primary tube are open, a liquid outlet 2124 is provided at the bottom of the sidewall, a gas hole is provided on the bottom plate, the bottom plate is connected to the opening at the bottom end of the primary tube, the lower gas tube is connected to the gas hole, and a liquid blocking cap 2125 is provided at the top. High-pressure tail gas is input into the first-stage scrubber from the gas-gas heat exchanger through the trachea, and in the first-stage scrubber, the washing liquid is upwards spouted to the contrary spray tube, and the washing liquid contacts with high-pressure tail gas adverse current to increase area of contact and dwell time, improve contact efficiency, reach the purpose of high-pressure tail gas cooling, purification. The high-pressure tail gas treated by the primary scrubber passes through the liquid-blocking cap and then is conveyed into the secondary scrubber from the lower gas pipe for further treatment, and most of the washing liquid is accumulated in the gas-liquid primary segment under the action of the liquid-blocking cap and can be discharged from the liquid outlet.
As shown in fig. 4, the secondary scrubber 22 includes a scrubber drum 221 and a shower pipe 222. The wash drum includes an upper gas phase section and a lower liquid phase section. The top of gaseous phase section is the opening, and the lateral wall department of gaseous phase section is equipped with ordinary pressure tail gas import 223, and the opposite side lateral wall passes through gaseous phase communicating pipe 6 and gas-liquid separator 3 intercommunication, and the export of gaseous phase communicating pipe is tangent with gas-liquid separator 3's inner wall. And a circulating liquid outlet 224 is formed in the bottom of one side of the side wall of the liquid phase section, and the side wall of the opposite side is communicated with the gas-liquid separator 3 through a liquid phase communicating pipe 7. And the high-pressure tail gas is washed by the primary washer and then is mixed with the normal-pressure tail gas entering from the normal-pressure tail gas inlet of the secondary washer, and the mixture is further sprayed, washed and cooled. The mixed tail gas after further washing and cooling enters the gas-liquid separator 3 from the secondary washer through the gas-phase communicating pipe 6.
The gas-liquid separator 3 includes an outer tub 31 and a center cyclone 32; both ends of the central cyclone cylinder are open, the central cyclone cylinder is coaxially arranged in the outer cylinder, the top end of the central cyclone cylinder is communicated with the air inlet cavity of the heat exchanger, and the bottom end of the central cyclone cylinder is suspended in the air; the gas-phase communicating pipe is tangent to the outer cylinder. In the gas-liquid separator 3, because the gas-phase communicating pipe is tangent to the outer cylinder of the gas-liquid separator, the mixed tail gas rotates in the gas-liquid separator to move downwards, and most of liquid foam carried by the mixed tail gas is thrown to the wall surface of the gas-liquid separator under the action of centrifugal force in the process to be removed. The mixed tail gas after gas-liquid separation rises, enters the air inlet cavity 113 of the gas-gas heat exchanger upwards and is input into the heat exchange tube 12, and is heated by the high-temperature high-pressure tail gas newly entering the outside of the heat exchange tube, and the mixed tail gas is finally changed into clean unsaturated superheated mixed gas and is discharged by the exhaust funnel 4 positioned at the top of the gas-gas heat exchanger. The separated liquid flows back to the secondary scrubber through the liquid phase communicating pipe and can be discharged from the circulating liquid outlet.
When this device is specifically handled tail gas, the specific process is as follows:
primary impurity removal; high-pressure high-temperature tail gas to be treated is tangentially input into a jacket of the gas-gas heat exchanger along a tangential gas pipe, the high-pressure tail gas rotates at a high speed in the jacket, partial entrained dirty liquid beads and solid particles are removed, and primary impurity removal is carried out.
And (3) cooling, wherein the high-pressure high-temperature tail gas after primary impurity removal moves from bottom to top in the heat exchange cavity and exchanges heat with gas in the heat exchange tube, and the steam part in the high-temperature high-pressure tail gas is condensed to reduce the tail gas amount entering the washing device, so that the diameter of the washing device can be reduced.
And (3) primary washing, wherein the cooled high-pressure tail gas is discharged from the top of the heat exchange cavity, enters a primary washer through a gas passing pipe, and is in countercurrent contact with a washing liquid moving from bottom to top in a reverse spraying pipe of the primary washer to be cooled again and purified for the first time.
Washing for the second time; and (3) inputting the high-pressure tail gas subjected to primary washing into a secondary washer, inputting normal-pressure tail gas into the secondary washer from the outside, mixing the two tail gases, spraying, washing and cooling again.
Gas-liquid separation; the mixed gas after the secondary washing is tangentially input into the gas-liquid separator, rotates and falls in the gas-liquid separator, and most of liquid foam is thrown to the wall surface of the gas-liquid separator by the action of centrifugal force to be removed. After gas-liquid separation, the liquid flows back into the secondary scrubber for discharge, and the gas meeting the discharge standard enters the gas-gas heat exchanger.
Heating; the gas meeting the exhaust standard exchanges heat with newly input untreated high-pressure tail gas in the heat exchange tube; on one hand, the exhaust gas is higher than the ambient temperature, and the formation of white mist is avoided; on the other hand, the high-pressure tail gas before washing is cooled, and the steam in the high-pressure tail gas after cooling is partially condensed, so that the tail gas amount entering the washing device is reduced, and the diameter of the washing device can be reduced.
The embodiment can effectively remove micro liquid drops, aerosol and solid particles in the tail gas, and the tail gas leaving the exhaust funnel does not generate obvious smoke plume. A targeted treatment strategy is adopted for the pressurized tail gas and the normal-pressure tail gas generated by the pressure leaching process, so that the equipment scale is saved, and the problem of blocking of the normal-pressure tail gas inlet is avoided.
Relative to a conventional wet-process tail gas scrubbing tower: the embodiment can simultaneously treat high-pressure tail gas and normal-pressure tail gas, and the conventional washing equipment has high air pressure and large tower resistance, so that the normal-pressure tail gas is inconvenient to treat; in addition, the implementation reheats the exhausted tail gas, so that the exhausted tail gas is greatly higher than the environmental temperature, and no white fog is formed; the tail gas before washing is cooled, and the steam in the cooled tail gas is partially condensed to reduce the tail gas amount entering the washing section, so that the diameter of the washing equipment can be reduced.
Claims (10)
1. A pressure leaching technology tail gas processing apparatus which characterized in that: the device comprises a gas-gas heat exchanger, a washing device, a gas-liquid separator and an exhaust funnel;
the gas-gas heat exchanger comprises a shell and a heat exchange tube, wherein the shell is a closed shell, the side wall of the upper part of the shell is provided with a gas outlet, the side wall of the lower part of the shell is provided with a high-pressure tail gas inlet, the heat exchange tube is arranged in the shell, the top end of the heat exchange tube is communicated with the exhaust funnel, and the bottom end of the heat exchange tube is communicated with the gas-liquid separator;
the washing device comprises a plurality of stages of washers which are sequentially arranged from top to bottom, the input end of the top washer is communicated with the air outlet on the shell, the bottom washer comprises a circulating liquid outlet and a normal pressure tail gas inlet, and a liquid phase communicating pipe and a gas phase communicating pipe are arranged between the bottom washer and the gas-liquid separator.
2. The pressure leaching process off-gas treatment plant of claim 1, wherein: the shell is a cylindrical shell, a pair of tube plates are arranged in the shell, a plurality of through holes are formed in the tube plates, the inner cavity of the shell is divided into three cavities by the two tube plates, and the three cavities are an exhaust cavity, a heat exchange cavity and an air inlet cavity from top to bottom in sequence; the heat exchange tubes are coaxially arranged in the heat exchange cavity, the top ends of the heat exchange tubes are arranged in the through holes of the upper tube plate, and the bottom ends of the heat exchange tubes are arranged in the through holes of the lower tube plate.
3. The pressure leaching process off-gas treatment plant of claim 2, wherein: a plurality of baffle plates are arranged in the heat exchange cavity, and pipe holes for the heat exchange pipes to pass through are formed in the baffle plates; an air inlet is arranged on the side wall of the bottom of the heat exchange cavity; an air inlet jacket is coated outside the bottom of the heat exchange cavity, a sewage discharge outlet is arranged at the bottom of the side wall of the air inlet jacket, and a tangential air pipe is arranged outside the air inlet jacket.
4. The pressure leaching process off-gas treatment plant of claim 2, wherein: the washing device comprises a primary washer and a secondary washer, and the primary washer is coaxially arranged with the top of the secondary washer; the input end of the first-stage scrubber is communicated with the heat exchange cavity, and the output end of the first-stage scrubber is communicated with the second-stage scrubber.
5. The pressure leaching process off-gas treatment plant of claim 4, wherein: the first-stage scrubber comprises a scrubbing section and a gas-liquid primary section which are communicated with each other, and the scrubbing section is coaxially arranged at the top of the gas-liquid primary section.
6. The pressure leaching process off-gas treatment plant of claim 5, wherein: the washing section comprises a washing pipe, a top cover and a reverse spray pipe, both ends of the washing pipe are open, the upper part of the pipe wall is provided with a through hole communicated with the gas outlet of the gas-gas heat exchanger, the lower part of the pipe wall is provided with a through hole for installing the reverse spray pipe, and the top cover seals the top opening of the washing pipe; the reverse spray pipe is an L-shaped pipe, the horizontal section of the reverse spray pipe is arranged along the radial direction of the washing pipe, and the vertical section of the reverse spray pipe is arranged along the axial direction of the washing pipe and has an upward opening.
7. The pressure leaching process off-gas treatment plant of claim 5, wherein: the gas-liquid primary section comprises a primary pipe, a bottom plate and a lower gas pipe, wherein both ends of the primary pipe are provided with openings, the bottoms of the side walls are provided with liquid discharge ports, the bottom plate is provided with gas holes, the bottom plate is connected to the opening at the bottom end of the primary pipe, and the lower gas pipe is connected to the inside of the gas holes and provided with liquid blocking caps at the tops.
8. The pressure leaching process off-gas treatment plant of claim 4, wherein: the secondary scrubber comprises a washing cylinder and a spray pipe; the washing barrel comprises an upper gas phase section and a lower liquid phase section, the top end of the gas phase section is provided with an opening, the normal pressure tail gas inlet is arranged in the gas phase section, and the circulating liquid outlet is arranged in the liquid phase section; the spray pipe is arranged in the gas phase section.
9. The pressure leaching process off-gas treatment plant of claim 2, wherein: the gas-liquid separator comprises an outer cylinder and a central cyclone cylinder; both ends of the central cyclone cylinder are open, the central cyclone cylinder is coaxially arranged in the outer cylinder, the top end of the central cyclone cylinder is communicated with the air inlet cavity of the heat exchanger, and the bottom end of the central cyclone cylinder is suspended in the air; the gas-phase communicating pipe is tangent to the outer cylinder.
10. The pressure leaching process tail gas treatment method is characterized by comprising the following steps:
s.1, primary impurity removal, namely tangentially inputting high-pressure high-temperature tail gas to be treated into a jacket of a gas-gas heat exchanger, rotating the high-pressure high-temperature tail gas in the jacket at a high speed, removing partial entrained dirty liquid beads and solid particles, and performing primary impurity removal;
s.2, exchanging heat and cooling, wherein the high-pressure high-temperature tail gas subjected to primary impurity removal enters an inner cavity of the gas-gas heat exchanger from a gas inlet, moves from bottom to top and exchanges heat with normal-temperature gas in the heat exchange pipe to cool;
s.3, multi-stage washing, wherein high-pressure tail gas subjected to heat exchange and temperature reduction enters a first-stage washer, is in countercurrent contact with washing liquid moving from bottom to top in a reverse spray pipe of the first-stage washer, is subjected to secondary temperature reduction and primary purification, is input into a second-stage washer, is mixed with normal-pressure tail gas input into the second-stage washer from the outside, and is subjected to secondary spray washing and temperature reduction;
s.4, performing gas-liquid separation, namely inputting the mixed tail gas subjected to washing and cooling into a gas-liquid separator, performing gas-liquid separation by virtue of centrifugal force, discharging liquid, and enabling the gas meeting the exhaust standard to enter a heat exchange tube of a gas-gas heat exchanger;
and S.5, heat exchange and temperature rise are carried out, the gas meeting the exhaust standard and untreated high-pressure and high-temperature tail gas which is newly input outside the heat exchange pipe are subjected to heat exchange and heated to rise the temperature in the heat exchange pipe, and then the gas is exhausted through an exhaust funnel, so that the exhaust gas is higher than the ambient temperature, and the formation of white fog is avoided.
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| CN202110008045.3A CN112827300B (en) | 2021-01-05 | 2021-01-05 | Pressure leaching process tail gas treatment device and method |
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| CN202110008045.3A CN112827300B (en) | 2021-01-05 | 2021-01-05 | Pressure leaching process tail gas treatment device and method |
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| CN112827300A CN112827300A (en) | 2021-05-25 |
| CN112827300B true CN112827300B (en) | 2022-06-07 |
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| GB9205900D0 (en) * | 1992-03-17 | 1992-04-29 | Process Scient Innovations | Method and apparatus for the treatment of gas streams |
| CN102872671A (en) * | 2012-10-15 | 2013-01-16 | 裴登明 | Asphalt waste gas purifying method and device |
| CN103406002A (en) * | 2013-08-23 | 2013-11-27 | 东南大学 | Dehumidification device and dehumidification method for normal-temperature regeneration pressurizing solution |
| CN106474886A (en) * | 2016-12-12 | 2017-03-08 | 中国矿业大学(北京) | A kind of industrial waste-gas purifier of low temperature plasma joint two-stage dynamic wave |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB9205900D0 (en) * | 1992-03-17 | 1992-04-29 | Process Scient Innovations | Method and apparatus for the treatment of gas streams |
| CN102872671A (en) * | 2012-10-15 | 2013-01-16 | 裴登明 | Asphalt waste gas purifying method and device |
| CN103406002A (en) * | 2013-08-23 | 2013-11-27 | 东南大学 | Dehumidification device and dehumidification method for normal-temperature regeneration pressurizing solution |
| CN106474886A (en) * | 2016-12-12 | 2017-03-08 | 中国矿业大学(北京) | A kind of industrial waste-gas purifier of low temperature plasma joint two-stage dynamic wave |
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