CN113634110A - Exhaust gas collection device and method - Google Patents

Exhaust gas collection device and method Download PDF

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Publication number
CN113634110A
CN113634110A CN202111091410.8A CN202111091410A CN113634110A CN 113634110 A CN113634110 A CN 113634110A CN 202111091410 A CN202111091410 A CN 202111091410A CN 113634110 A CN113634110 A CN 113634110A
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Prior art keywords
liquid
reaction cavity
gas
reaction
injection pipe
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CN202111091410.8A
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Inventor
吴剑
张玲玲
章许云
陈飞
吴海锁
张亚一
盛夏
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Jiangsu Academy Of Environmental Industry Technology And Technology Corp ltd
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Jiangsu Academy Of Environmental Industry Technology And Technology Corp ltd
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Priority to CN202111091410.8A priority Critical patent/CN113634110A/en
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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
    • 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
    • B01D53/1475—Removing carbon dioxide
    • 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
    • B01D53/1487—Removing organic compounds
    • 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
    • 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
    • B01D53/185—Liquid distributors
    • 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
    • B01D53/52—Hydrogen sulfide
    • 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
    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
    • 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
    • B01D53/62—Carbon oxides
    • 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
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/30—Alkali metal compounds
    • B01D2251/304—Alkali metal compounds of sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/50—Inorganic acids
    • B01D2251/506—Sulfuric acid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/80—Organic bases or salts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/10—Inorganic absorbents
    • B01D2252/103—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20478—Alkanolamines
    • B01D2252/20484—Alkanolamines with one hydroxyl group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/205—Other organic compounds not covered by B01D2252/00 - B01D2252/20494
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/304—Hydrogen sulfide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention belongs to the technical field of waste gas treatment, and discloses a waste gas trapping device which comprises a reaction cavity, wherein an air inlet pipeline is arranged at the middle lower part of the reaction cavity, a gas outlet is arranged at the top part of the reaction cavity, a liquid outlet is arranged at the bottom part of the reaction cavity, the air inlet pipeline is communicated to a multi-nozzle injection pipe arranged in the reaction cavity, the free end of the multi-nozzle injection pipe is closed, injection nozzles are distributed on the pipe wall of the multi-nozzle injection pipe, a packing unit is arranged above the multi-nozzle injection pipe, and a liquid inlet is arranged on the side wall of the reaction cavity above the packing unit. The invention also discloses a method for trapping and concentrating the waste gas by using the device. Aiming at the exhaust emission characteristics, the invention designs the trapping device which gives consideration to the rapid and slow processes of exhaust absorption; the micro bubbles generated by spraying can increase the phase interface, improve the mass transfer efficiency and the absorption capacity, and are particularly beneficial to the slow reaction; the absorption effect can be further improved by temperature adjustment. The device can also flexibly select a jet bubbling section or a filler section for treatment according to the property, the concentration and the like of the waste gas to be treated, thereby saving energy and reducing consumption.

Description

Exhaust gas collection device and method
Technical Field
The invention relates to a waste gas trapping device and a method, belonging to the waste gas treatment technology.
Background
Under the background of carbon neutralization, carbon peak reaching and environment high-quality protection, the requirements of trapping, deep treatment, recycling and the like of waste gas discharged by industrial enterprises are continuously improved. At present, many methods for treating industrial waste gas are roughly classified into a condensation method, an absorption method, an adsorption method, a combustion method, a biological method, a photocatalytic method, and the like. The chemical absorption method is widely applied due to the advantages of wide application range, large absorption capacity, high purification degree, strong selectivity and the like, and waste gas can be further analyzed under certain conditions (high temperature, low pressure and the like), so that the waste gas utilization rate is improved.
At present, a waste gas absorption device comprises a packed tower, a plate tower, a spray tower and the like according to structural characteristics, relatively speaking, the packed tower has the advantages of simple structure, large gas-liquid contact area, long contact time, strong adaptability of the tower when the gas amount changes, small fluid flow resistance and obvious advantages, but the operation range is smaller, the packed tower is particularly sensitive to liquid load change, and the gas-liquid contact is reduced to a certain extent due to uneven distribution of the gas and the liquid in the tower, so that the absorption effect is influenced.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art and provides a waste gas trapping device and method which are large in gas-liquid phase interface, good in mass transfer effect and high in removal rate.
The technical scheme is as follows: in order to solve the technical problem, the invention discloses a waste gas trapping device which comprises a reaction cavity, wherein an air inlet pipeline is arranged at the middle lower part of the reaction cavity, a gas outlet is arranged at the top part of the reaction cavity, a liquid outlet is arranged at the bottom part of the reaction cavity, the air inlet pipeline is communicated to a multi-nozzle injection pipe arranged in the reaction cavity, the free end of the multi-nozzle injection pipe is closed, injection nozzles are distributed on the pipe wall of the multi-nozzle injection pipe, a packing unit is arranged above the multi-nozzle injection pipe, and a liquid inlet is arranged on the side wall of the reaction cavity above the packing unit.
The diameter of the spray nozzle is 1 mm-5 mm. Preferably, the length of the multi-nozzle injection pipe (3) is 30-60% of the height of the reaction cavity, and the diameter is 5-15% of the diameter of the reaction cavity.
The height-diameter ratio of the reaction cavity is preferably 5-15.
And a liquid circulating pipeline is arranged between the liquid outlet and the liquid inlet outside the reaction cavity. Furthermore, a circulating pump, a third valve and a flowmeter are sequentially arranged between the liquid outlet and the liquid inlet of the liquid circulating pipeline.
In order to facilitate the control of the reaction temperature, the outer wall of the reaction cavity is provided with a heat exchange sleeve, and the temperature can be controlled by changing a medium in the heat exchange sleeve.
The liquid inlet is connected with a liquid distributor, and a defoaming silk screen is arranged above the liquid distributor. Preferably, the liquid distributor is disc-shaped, and holes of 2-6mm are uniformly distributed on the disc surface and used for spraying the circulating liquid.
Preferably, the multi-nozzle injection pipe is vertically arranged along the longitudinal axis of the reaction cavity.
The method for trapping the exhaust gas by using the exhaust gas trapping device comprises the following steps:
1) controlling the temperature of the reaction cavity to be 5-50 ℃;
2) the waste gas enters the multi-nozzle injection pipe along the air inlet pipeline, fully contacts and reacts with the absorption liquid under the condition that the liquid level of the absorption liquid is higher than the free end of the multi-nozzle injection pipe, and is discharged from the gas outlet after being purified; or under the condition that the liquid level of the absorption liquid is lower than that of the air inlet pipeline, the waste gas reacts with the absorption liquid in the packing unit, and the purified waste gas is discharged from the gas outlet; or the waste gas enters the multi-nozzle injection pipe along the air inlet pipeline, the waste gas is in full contact reaction with the absorption liquid under the condition that the liquid level of the absorption liquid is higher than the free end of the multi-nozzle injection pipe, then the waste gas and the absorption liquid perform secondary reaction in the packing unit, and the purified waste gas is discharged from the gas outlet;
3) under the condition that a plurality of reaction cavities are connected in series, the gas discharged from the gas outlet pipeline of the previous reaction cavity is communicated to the gas inlet pipeline of the next reaction cavity;
4) the treated gas which meets the discharge standard is directly discharged through a gas outlet pipeline of the reaction cavity, the gas which does not meet the discharge standard is discharged after being further treated, and the absorption liquid after reaction is discharged from a liquid outlet.
In the step 1), the temperature of the reaction cavity is controlled by arranging a replacement thermal sleeve.
In the step 2), a liquid circulation pipeline is arranged between the liquid outlet and the liquid inlet outside the reaction cavity, and the circulation pipeline is correspondingly opened under the condition that a packing unit is required to be used.
The waste gas trapping device has high integration and reasonable design, and can select a proper operation mode by combining the characteristics (air quantity, concentration, reaction rate and the like) of the absorbent and the waste gas.
For high air flow rate and moderate speed reaction, such as butyl acetate (absorbent: methyl oleate), CO2(absorbent: diethanolamine), NH3(absorbent: water) and the like, the lower end injection absorption section can be used only, the height of the absorption liquid in the reaction cavity is kept to be higher than that of the injection multi-nozzle injection pipe, a liquid circulating pump is not required to be started, and gas passes through the packing unit after contacting and reacting with the absorption liquid through the multi-nozzle injection pipe and is discharged from a gas outlet.
For low air flow rates, e.g. H2S (absorbent: sodium hydroxide), NH3(absorbent: dilute sulfuric acid) and the like, the liquid circulating pump is started only by using the upper end filler absorption section, the liquid height of the absorption liquid does not exceed the height of the air inlet pipeline, the gas passes through the filler unit after passing through the multi-nozzle injection pipe to react with the absorption liquid, and the purified gas is discharged from the outlet.
For high-concentration fast and slow reaction, the lower end injection absorption section and the upper end packing absorption section are selected to be used simultaneously, the height of absorption liquid in the reaction cavity is kept to be higher than that of the injection multi-nozzle injection pipe, the liquid circulating pump is started, gas is in contact reaction with the absorption liquid through the multi-nozzle injection pipe, secondary reaction is carried out on the gas and the absorption liquid in the packing unit, and the purified gas is discharged from the outlet.
Aiming at the waste gas with complex factors, a plurality of (for example 2-4) reaction cavities can be arranged in series, the height of absorption liquid in each reaction cavity is kept to be higher than that of a multi-nozzle injection pipe, a liquid circulating pump is started, the waste gas sequentially passes through an absorption tower, and a reasonable absorbent is prepared by combining the waste gas factors. Meanwhile, each absorption tower also selects a jet absorption or filler absorption mode according to the concentration and the characteristics of the selected and absorbed waste gas factors, so that the energy consumption of waste gas treatment is reduced.
The components, the connection relation or the position relation among the components and the parts which are not mentioned in the invention can be realized by adopting the feasible prior art.
Has the advantages that: compared with the prior art, the invention designs a novel trapping device aiming at the exhaust emission characteristics, the upper end of the trapping device keeps the filler absorption advantage, the lower end adopts a jet bubbling mode to make up the defect of filler absorption, and the exhaust absorption speed and speed process are considered; the micro bubbles generated by spraying can increase the phase interface, improve the mass transfer efficiency and the absorption capacity, and are particularly beneficial to the slow reaction; the absorption effect can be further improved by temperature adjustment. The device can also flexibly select a jet bubbling section or a filler section for treatment according to the property, the concentration and the like of the waste gas to be treated, thereby saving energy and reducing consumption.
Drawings
FIG. 1 is a schematic view of an exhaust gas trapping device;
FIG. 2 is a schematic diagram of a series application of an exhaust gas trapping device.
Description of the labeling: 1-a reaction chamber; 2-an air inlet pipeline; 3-a multi-nozzle injection pipe; 4-heat exchange sleeve; 5-a filler unit; 6-defoaming silk screen; 7-a liquid outlet; 8-a gas outlet; 9-a first valve, 10-a second valve, 11-a third valve; 12-a liquid circulation pump; 13-a flow meter; 14-a liquid circulation line; 15-gas outlet pipeline; 16-a liquid outlet pipeline; 17-a spray nozzle; 18-a liquid distributor; 19-liquid inlet.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining specific drawings and embodiments.
Example 1 exhaust gas trapping device
The waste gas trapping device is shown in figure 1 and comprises a reaction cavity 1, the height-diameter ratio of the reaction cavity 1 is 5-15, a heat exchange sleeve 4 is arranged on the outer wall of the reaction cavity, an air inlet pipeline 2 is arranged at the middle lower part of the reaction cavity, the air inlet pipeline 2 is controlled by a first valve 9, a gas outlet 8 is arranged at the top of the reaction cavity, a liquid outlet 7 is arranged at the bottom of the reaction cavity, and the liquid outlet 7 is controlled by a second valve 10. The air inlet pipeline 2 is communicated with a multi-nozzle injection pipe 3 arranged in the reaction cavity, the multi-nozzle injection pipe 3 is vertically arranged along the longitudinal axis of the reaction cavity, the free end is closed, injection nozzles 17 with the diameter of 1 mm-5 mm are uniformly distributed on the pipe wall, a packing unit 5 is arranged above the multi-nozzle injection pipe 3, a liquid inlet 19 is arranged on the side wall of the reaction cavity above the packing unit, the liquid inlet 19 is connected to a disc-shaped liquid distributor 18 in the reaction cavity 1, and holes with the diameter of 2-6mm are uniformly distributed on the disc surface and used for spraying circulating liquid; a defoaming silk screen 6 is arranged above the liquid distributor 18. The packing unit 5 and the defoaming silk screen 6 are arranged on the mounting frame, and the mounting frame is directly connected with the reaction cavity 1. Outside the reaction chamber, a liquid circulation pipeline 14 is arranged between the liquid outlet 7 and the liquid inlet 19, and a circulation pump 12, a third valve 11 and a flow meter 13 are sequentially connected between the liquid outlet 7 and the liquid inlet 19 of the liquid circulation pipeline 14. As shown in fig. 2, the exhaust gas trapping device may be used in series to connect the gas outlet of the previous reaction chamber to the near-term pipeline of the next reaction chamber.
Example 2
CO in exhaust gas by using exhaust gas capturing device of FIG. 12When in trapping, the method comprises the following steps: diethanolamine is selected as absorption liquid, the temperature of a heat exchange sleeve is controlled at 15 ℃, the height-diameter ratio of a reaction cavity 1 is 10, and the diameter of a spray nozzle 17 is 2 mm. Before the device runs, the second valve 10 of the liquid outlet is closed, a certain amount of absorption liquid is injected, the third valve 11 and the pump 12 of the liquid circulation pipeline are opened, and the flow is controlled; the first valve 9 of the gas inlet is opened to contain CO2The waste gas is introduced into a reaction cavity, and the liquid firstly passes throughThe injection nozzle 17 fully contacts with the absorption liquid and then enters the packing layer for secondary absorption, and the treated waste gas is discharged through a gas outlet. And after the absorption liquid is saturated, closing the third valve 11 and the pump 12 of the circulating pipeline, opening the second valve 10 of the liquid outlet, and collecting the liquid to be analyzed.
Example 3
Using the apparatus shown in FIG. 1 for containing NH3The treatment of the low-concentration industrial waste gas comprises the following steps: the absorption liquid is dilute sulphuric acid, only a spraying bubbling section is selected to meet the requirement, the temperature of the heat exchange sleeve is controlled to be 5 ℃, the height-diameter ratio of the reaction cavity 1 is 8, and the diameter of the spraying nozzle 17 is 2 mm. Before the device runs, the second valve 10 of the liquid outlet is closed, a certain amount of absorption liquid is injected, and the third valve 11 and the pump 12 of the liquid circulation pipeline are not required to be opened; opening the first valve 9 of the gas inlet will contain NH3The waste gas is introduced into the reaction chamber, and the liquid is fully contacted with the absorption liquid through the injection nozzle 17 and then discharged through the gas outlet. After the absorption liquid is saturated, the liquid outlet valve 10 is opened, and NH to be treated and treated is collected3The removal rate reaches 98 percent.
Example 4
Using the series arrangement shown in figure 2 for containing SO2、CO2The treatment of high-concentration industrial waste gas comprises the following steps: wherein, the absorption liquid respectively selects sodium hydroxide and a triethanolamine solution, the temperature of the heat exchange sleeve is controlled at 5 ℃, the height-diameter ratio of the reaction cavity is 12, and the diameter of the injection nozzle 17 is 1.5 mm. Before the device runs, closing the second valves of the liquid outlets of the 2 absorption towers, injecting a certain amount of absorption liquid, opening the third valve and the pump of the liquid circulation pipeline, and controlling the flow; opening the first valve of the gas inlet of the reaction chamber to contain SO2、CO2The waste gas is introduced into the reaction cavity, the liquid fully contacts with the absorption liquid through the injection nozzle and then enters the packing layer for secondary absorption, and the treated waste gas enters the reaction cavity 1+ through the gas outlet. And after the absorption liquid is saturated, closing the third valve and the pump of the circulating pipeline, opening the second valve of the liquid outlet, and collecting the liquid to be further processed.
While the invention has been described with respect to a number of embodiments and methods of providing an exhaust gas trapping device, it will be understood by those skilled in the art that the foregoing is illustrative of the preferred embodiments of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.

Claims (10)

1. The waste gas trapping device comprises a reaction cavity (1), wherein an air inlet pipeline (2) is arranged at the middle lower part of the reaction cavity, a gas outlet (8) is arranged at the top of the reaction cavity, and a liquid outlet (7) is arranged at the bottom of the reaction cavity, and is characterized in that the air inlet pipeline (2) is communicated to a multi-nozzle injection pipe (3) arranged in the reaction cavity, the free end of the multi-nozzle injection pipe (3) is sealed, injection nozzles (17) are distributed on the pipe wall, a packing unit (5) is arranged above the multi-nozzle injection pipe (3), and a liquid inlet (19) is arranged on the side wall of the reaction cavity above the packing unit.
2. The exhaust gas trapping device according to claim 1, wherein the diameter of the injection nozzle (17) is 1mm to 5 mm.
3. The exhaust gas trapping device according to claim 1, wherein the reaction chamber (1) has an aspect ratio of 5 to 15.
4. An exhaust gas trapping device according to claim 1, characterized in that a liquid circulation line (14) is provided outside the reaction chamber between the liquid outlet (7) and the liquid inlet (19).
5. The exhaust gas trapping device according to claim 1, wherein a heat exchange jacket (4) is provided on the outer wall of the reaction chamber.
6. An exhaust gas trapping device according to claim 1, characterized in that the liquid inlet (19) is connected to a liquid distributor (18) in the reaction chamber, and a demister wire (6) is arranged above the liquid distributor (18).
7. The exhaust gas trapping device according to claim 1, wherein the multi-nozzle injection pipe (3) is arranged vertically along the longitudinal axis of the reaction chamber.
8. The method of trapping exhaust gas using the exhaust gas trapping device according to claim 1, comprising the steps of:
1) controlling the temperature of the reaction cavity to be 5-50 ℃;
2) the waste gas enters the multi-nozzle injection pipe along the air inlet pipeline, fully contacts and reacts with the absorption liquid under the condition that the liquid level of the absorption liquid is higher than the free end of the multi-nozzle injection pipe, and is discharged from the gas outlet after being purified; or under the condition that the liquid level of the absorption liquid is lower than that of the air inlet pipeline, the waste gas reacts with the absorption liquid in the packing unit, and the purified waste gas is discharged from the gas outlet; or the waste gas enters the multi-nozzle injection pipe along the air inlet pipeline, the waste gas is in full contact reaction with the absorption liquid under the condition that the liquid level of the absorption liquid is higher than the free end of the multi-nozzle injection pipe, then the waste gas and the absorption liquid perform secondary reaction in the packing unit, and the purified waste gas is discharged from the gas outlet;
3) under the condition that a plurality of reaction cavities are connected in series, the gas discharged from the gas outlet pipeline of the previous reaction cavity is communicated to the gas inlet pipeline of the next reaction cavity;
4) the treated gas which meets the discharge standard is directly discharged through a gas outlet pipeline of the reaction cavity, the gas which does not meet the discharge standard is discharged after being further treated, and the absorption liquid after reaction is discharged from a liquid outlet.
9. The method for trapping exhaust gas according to claim 8, wherein in step 1), the temperature of the reaction chamber is controlled by providing a replacement thermal jacket.
10. The method for capturing exhaust gas according to claim 8, wherein in the step 2), a liquid circulation line is arranged outside the reaction chamber between the liquid outlet and the liquid inlet, and the liquid circulation line is correspondingly opened in the case that a packing unit is required.
CN202111091410.8A 2021-09-17 2021-09-17 Exhaust gas collection device and method Pending CN113634110A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111091410.8A CN113634110A (en) 2021-09-17 2021-09-17 Exhaust gas collection device and method

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Application Number Priority Date Filing Date Title
CN202111091410.8A CN113634110A (en) 2021-09-17 2021-09-17 Exhaust gas collection device and method

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CN113634110A true CN113634110A (en) 2021-11-12

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