CN112138517A - System and method for deeply treating smoke plume - Google Patents

System and method for deeply treating smoke plume Download PDF

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Publication number
CN112138517A
CN112138517A CN202011106600.8A CN202011106600A CN112138517A CN 112138517 A CN112138517 A CN 112138517A CN 202011106600 A CN202011106600 A CN 202011106600A CN 112138517 A CN112138517 A CN 112138517A
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medicament
agent
smoke
injection
outlet
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CN202011106600.8A
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Chinese (zh)
Inventor
付康丽
赵瀚辰
王定帮
姚明宇
杨嵩
程广文
杨成龙
蔡铭
郭中旭
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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Priority to CN202011106600.8A priority Critical patent/CN112138517A/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
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • 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
    • 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
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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

Abstract

The invention relates to a system and a method for deeply treating smoke plume, wherein the system comprises an ultrasonic agglomeration system, a medicament falling system, a medicament injection system and a medicament supply system, wherein the ultrasonic agglomeration system, the medicament falling system and the medicament injection system are sequentially arranged on an outlet flue of a desulfurizing tower along a smoke direction; the ultrasonic agglomeration system is arranged at a flue gas inlet of the outlet flue; the medicament injection system is arranged at a smoke outlet of the outlet flue, and the medicament atomization injection direction of the medicament injection system is opposite to the smoke direction; the medicament falling system comprises a medicament falling pool; the medicament falling pool is communicated with the bottom of an outlet flue between the ultrasonic agglomeration system and the medicament injection system and is connected with the medicament supply system; the agent injection system comprises at least one agent injection layer distributed at the smoke outlet of the outlet flue; a plurality of medicament nozzles are uniformly distributed on each medicament injection layer and are connected with the medicament falling pool. The invention has reasonable design and simple structure and can effectively eliminate white smoke plume.

Description

System and method for deeply treating smoke plume
Technical Field
The invention relates to the field of environmental protection, in particular to a system and a method for deeply treating smoke plume.
Background
At present, 90% of domestic desulfurization processes adopt wet desulfurization, and because the clean flue gas at the outlet of an absorption tower of a wet flue gas desulfurization system is in a wet saturation state, part of vaporous water and pollutants in the flue gas can be condensed due to temperature reduction in the process of flowing through a flue and a chimney and being discharged into the atmosphere, so that vaporous water vapor is formed at the mouth of the chimney, and the vaporous water vapor can be subjected to slight color change due to sky background color, sky illumination, observation angle and the like, so that colored smoke plume is formed.
The national environmental protection standard of the emission standard of atmospheric pollutants of coal-fired power plants is issued in succession in Shanghai, Zhejiang and the like, and the coal-fired power plants are definitely required to take effective measures to eliminate colored smoke plume. The method reduces the moisture content of the discharged flue gas by adopting a corresponding technology, collects supersaturated water vapor and moisture in the flue gas, and reduces the discharge of condensable particles such as soluble salt, sulfuric acid mist, organic matters and the like in the flue gas.
A sampling flue gas condensation reheating technical route is a flue gas treatment scheme which is generally applied at present. This scheme can effectively reduce flue gas discharge temperature and moisture content, can collect moisture in the supersaturation vapor in the flue gas, reduces the emission of particulate matter that can condense such as soluble salt, sulphuric acid mist, organic matter in the flue gas. In the existing stage of flue gas condensation technology, a flue condensing tube type heat exchanger is arranged in a flue at an outlet of a desulfurization tower or a slurry plate type heat exchanger is arranged in a slurry circulating pipeline, the flue space between the outlet of the desulfurization tower and an inlet of a chimney is difficult to arrange the flue condensing tube type heat exchanger after the desulfurization device of an existing power plant is transformed by ultralow emission, the arrangement position of the flue condensing tube type heat exchanger is high, the power consumption of a matched circulating water pump is large, the transformation engineering quantity is large, and the overhaul and maintenance are difficult; the space of the slurry circulating pipeline is limited, the on-way resistance of slurry in the circulating pipeline is increased, the slurry plate type heat exchanger has the risk of blockage, and the corresponding slurry circulating pump needs to be stopped when the heat exchanger fails.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a system and a method for deeply treating smoke plume, which have the advantages of reasonable design and simple structure and can effectively eliminate white smoke plume.
The invention is realized by the following technical scheme:
a system for deeply treating smoke plume comprises an ultrasonic agglomeration system, a medicament falling system, a medicament injection system and a medicament supply system, wherein the ultrasonic agglomeration system, the medicament falling system and the medicament injection system are sequentially arranged on an outlet flue of a desulfurizing tower along a smoke direction;
the ultrasonic agglomeration system is arranged at a flue gas inlet of the outlet flue; the medicament injection system is arranged at a smoke outlet of the outlet flue, and the medicament atomization injection direction of the medicament injection system is opposite to the smoke direction;
the medicament falling system comprises a medicament falling pool; the medicament falling pool is communicated with the bottom of an outlet flue between the ultrasonic agglomeration system and the medicament injection system and is connected with the medicament supply system.
Furthermore, the medicament injection system comprises at least one medicament injection layer distributed at the smoke outlet of the outlet flue; a plurality of medicament nozzles are uniformly distributed on each medicament injection layer, the injection direction is opposite to the smoke direction, and the injection lift range is 3-5 m.
Furthermore, the medicament nozzle is connected with the medicament falling pool through a medicament spraying pump.
Furthermore, the ultrasonic agglomeration system comprises a plurality of ultrasonic generating devices distributed at the flue gas inlet of the outlet flue; the ultrasonic generator is arranged opposite to the medicament nozzle and is spaced from the medicament nozzle by a distance ranging from 3 m to 4 m.
Furthermore, a medicine outlet is arranged at the bottom of the medicine falling pool, and the upper part of the medicine falling pool is connected with a medicine supply system.
Furthermore, the medicament supply system comprises a medicament pool which is communicated with the medicament falling pool through a medicament feeding pump, and the medicament contained in the medicament falling pool is at least one of anionic surfactant and nonionic surfactant.
A method for deeply treating smoke plume includes that a medicament injection system injects a medicament in a medicament falling system into an outlet flue, and after flue gas at the outlet of a desulfurizing tower enters the outlet flue, the flue gas is in reverse convection contact with the medicament atomized and injected by the medicament injection system, so that wet saturated flue gas is converted into a supersaturated state, and water vapor, fine particles and trace pollutants in the wet flue gas are agglomerated;
under the action of an ultrasonic agglomeration system, agglomeration of water vapor, fine particles and trace pollutants in wet flue gas is enlarged;
under the action of gravity, the smoke plume falls into a medicament falling system together with the medicament to complete the depth treatment of the smoke plume.
Further, when the medicament in the medicament falling pool of the medicament falling system is consumed to a set degree, the medicament pool of the medicament supply system replenishes the fresh medicament to the medicament falling pool.
Furthermore, the liquid-gas ratio of the injection quantity of the medicament to the smoke is 0.05v/v-0.5 v/v; the volume concentration of the medicament is 0.001-0.2% w/v; the medicament is anionic surfactant, nonionic surfactant or a compound of the anionic surfactant and the nonionic surfactant.
Furthermore, the sound field frequency of the ultrasonic generating device is 0.5-5 kHz.
Compared with the prior art, the invention has the following beneficial technical effects:
the system adopts a mode of arranging a medicament injection system and an ultrasonic agglomeration system at an outlet flue of the desulfurizing tower, so that flue gas at the outlet of the desulfurizing tower passes through the system and then is in reverse convection contact with a medicament atomized and injected by the medicament injection system, on one hand, the atomized injection of the medicament further reduces the temperature of the flue gas, promotes the wet saturated flue gas to be converted into a supersaturated state, and on the other hand, the medicament reduces the surface tension of the wet flue gas, and promotes the agglomeration of water vapor, fine particles and trace pollutants in the wet flue gas; meanwhile, under the action of an ultrasonic agglomeration system, agglomeration of water vapor, fine particles and trace pollutants in the wet flue gas is further promoted to be increased, and finally, the wet flue gas and the medicament fall into a medicament fall-back tank together under the action of gravity, so that the aim of deeply treating the smoke plume is fulfilled, soluble salts in the flue gas can be effectively removed, and the removal rate is as high as 98%.
Furthermore, the direction of medicament atomization spraying in the medicament nozzle of the system is opposite to the direction of flue gas, and reverse spraying is required, so that the mass transfer effect is increased; the spraying lift of the medicament is 3-5m, so that the residence reaction time of the medicament and the wet flue gas is ensured.
Furthermore, the ultrasonic generating device used by the system of the invention requires to form a low-frequency standing wave sound field in the flue, so as to promote the relative motion, collision and agglomeration among the water vapor, the fine particles and the trace pollutants in the flue gas at the outlet of the desulfurizing tower.
Drawings
Fig. 1 is a schematic structural diagram according to an embodiment of the present invention.
In the figure: desulfurizing tower 1, medicament pond 2, medicament feeding pump 3, medicament fall-back pond 4, medicament spray pump 5, medicament discharge port 6, medicament nozzle 7, export flue 8, supersound generating device 9.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a system for deeply treating smoke plume, which comprises an ultrasonic agglomeration system, a medicament falling system, a medicament supply system and a medicament injection system, wherein the ultrasonic agglomeration system, the medicament falling system, the medicament supply system and the medicament injection system are arranged along an outlet flue 8 of a desulfurizing tower 1;
the ultrasonic agglomeration system is arranged at a flue gas inlet of the outlet flue 8 and comprises an ultrasonic generating device 9; the ultrasonic generating devices 9 are symmetrically distributed on two sides of a smoke inlet of the outlet flue 8, are opposite to the agent nozzles 7, and are spaced from the agent nozzles 7 by 3-4 m.
The medicament falling system is arranged on an outlet flue 8 between the ultrasonic agglomeration system and the medicament injection system and is connected with the medicament supply system; the medicament falling system comprises a medicament falling pool 4, a medicament spraying pump 5 and a medicament discharge port 6 arranged at the bottom of the medicament falling pool 4; the agent falling pool 4 is communicated with the bottom of an outlet flue 8 arranged between the agent nozzle 7 and the ultrasonic generating device 9 and is communicated with the agent nozzle 7 through the agent spraying pump 5.
The medicament supply system comprises a medicament pool 2 and a medicament feeding pump 3; the medicament pool 2 is communicated with the medicament falling pool 4 through a medicament liquid feeding pump 3, and the medicament contained in the medicament falling pool is anionic surfactant with the concentration of 0.001-0.2%, nonionic surfactant or a compound of the anionic surfactant and the nonionic surfactant.
The medicament injection system is arranged at the smoke outlet of the outlet flue 8, and the medicament atomization injection direction of the medicament injection system is opposite to the smoke direction; the medicament injection system comprises a medicament injection layer, a medicament nozzle 7 and a medicament spray pump 5; at least one layer of the agent injection layer is distributed at the smoke outlet of the outlet flue 8; a plurality of medicament nozzles 7 connected with a medicament falling system through a medicament spraying pump 5 are uniformly distributed on each medicament spraying layer, the spraying direction is opposite to the smoke direction, and the spraying lift range is 3-5 m.
Wherein the medicament is one or more of environment-friendly anionic surfactant and nonionic surfactant, and the use concentration of the medicament is 0.001-0.2% w/v;
the medicament in the medicament falling pool 4 can be reused, and when the medicament in the medicament solution is consumed to a certain degree, fresh medicament can be supplemented to the medicament falling pool, and the smoke plume depth treatment is continued.
The invention relates to a method for deeply treating smoke plume, which comprises the following steps,
the agent injection system injects the agent in the agent falling system into the outlet flue 8, and after the flue gas at the outlet of the desulfurizing tower 1 enters the outlet flue 8, the flue gas is in reverse convection contact with the agent atomized and injected by the agent injection system, so that the wet saturated flue gas is converted into a supersaturated state, and water vapor, fine particulate matters and trace pollutants in the wet flue gas are agglomerated; meanwhile, under the action of the ultrasonic agglomeration system, the agglomeration of water vapor, fine particles and trace pollutants in the wet flue gas is further promoted to be increased, and finally, the wet flue gas and the medicament fall into a medicament falling system together under the action of gravity to finish the deep treatment of the smoke plume.
Wherein, the medicament in the medicament falling pool 4 of the medicament falling system is reused, and when the medicament in the medicament falling pool 4 of the medicament falling system is consumed to a certain degree, the medicament pool 2 of the medicament supply system replenishes the fresh medicament to the medicament falling pool 4.
Wherein, the liquid-gas ratio of the injection amount of the medicament to the smoke is 0.05v/v-0.5v/v, the medicament used in the medicament pool 2 is anionic surfactant, nonionic surfactant or a compound of the anionic surfactant and the nonionic surfactant, and the concentration of the surfactant is 0.001-0.2% w/v.
Wherein the frequency of the sound field of the ultrasonic generating device 9 is adjustable within 0.5-5 kHz.
In the preferred embodiment, the flue gas volume of the coal-fired boiler after passing through the desulfurizing tower 1 is 5000m3H is used as the reference value. Before the system is used, obvious white smoke can be seen, and soluble substance test is carried out on white smoke plume, so that the content of soluble substances in the white smoke plume is 10.5mg/m3(ii) a After the system is used, the medicament is a mixture of 0.05 percent of sodium dodecyl sulfate and 0.05 percent of alkylphenol polyoxyethylene, the liquid-gas ratio of the medicament injection amount to the smoke is 0.5v/v, and the ultrasonic sound field frequency is 1.5kHz, so that white smoke can not be seen by naked eyes, and the content of soluble substances in the smoke is measured to be 0.37g/m3。

Claims (10)

1. A system for deeply treating smoke plume is characterized by comprising an ultrasonic agglomeration system, a medicament falling system, a medicament injection system and a medicament supply system, wherein the ultrasonic agglomeration system, the medicament falling system and the medicament injection system are sequentially arranged on an outlet flue (8) of a desulfurizing tower (1) along a smoke direction;
the ultrasonic agglomeration system is arranged at a flue gas inlet of the outlet flue (8); the medicament injection system is arranged at a smoke outlet of the outlet flue (8), and the medicament atomization injection direction of the medicament injection system is opposite to the smoke direction;
the medicament falling system comprises a medicament falling pool (4); the medicament falling pool (4) is communicated with the bottom of an outlet flue (8) arranged between the ultrasonic agglomeration system and the medicament injection system and is connected with a medicament supply system.
2. A system for plume depth treatment according to claim 1, wherein the agent injection system comprises at least one agent injection layer distributed at the flue gas outlet of the outlet flue (8); a plurality of agent nozzles (7) are uniformly distributed on each agent injection layer, the injection direction is opposite to the smoke direction, and the injection lift range is 3-5 m.
3. The system for the depth treatment of smoke plume as claimed in claim 2, wherein said chemical nozzles (7) are connected to the chemical fall back tank (4) through a chemical spray pump (5).
4. A system for the depth treatment of a smoke plume as claimed in claim 2, wherein said ultrasonic agglomeration system comprises a plurality of ultrasonic generating means (9) distributed at the smoke inlet of the outlet flue (8); the ultrasonic generating device (9) is arranged opposite to the medicament nozzle (7) and is spaced from the medicament nozzle (7) by a distance ranging from 3 m to 4 m.
5. The system for the treatment of the depth of smoke plume as claimed in claim 1, wherein the bottom of said chemical dropping pool (4) is provided with a chemical outlet (6), and the upper part is connected with a chemical supply system.
6. A system for the treatment of the depth of smoke plume as claimed in claim 5, wherein said chemical supply system comprises a chemical tank (2) connected to a chemical fall-back tank (4) via a chemical feed pump (3), and containing at least one of anionic surfactant and nonionic surfactant.
7. A method for depth treatment of smoke plume, which is based on the system of any one of claims 1-6,
the agent injection system injects the agent in the agent falling system into the outlet flue (8), and after the flue gas at the outlet of the desulfurizing tower (1) enters the outlet flue (8), the flue gas is in reverse convection contact with the agent atomized and injected by the agent injection system, so that the wet saturated flue gas is converted into a supersaturated state, and water vapor, fine particles and trace pollutants in the wet flue gas are agglomerated;
under the action of an ultrasonic agglomeration system, agglomeration of water vapor, fine particles and trace pollutants in wet flue gas is enlarged;
under the action of gravity, the smoke plume falls into a medicament falling system together with the medicament to complete the depth treatment of the smoke plume.
8. The method for the depth control of smoke plume according to claim 7, wherein the agent tank (2) of the agent supply system supplies fresh agent to the agent fall tank (4) when the agent in the agent fall tank (4) of the agent fall system is consumed to a set extent.
9. The method of claim 8, wherein the ratio of the amount of the agent injected to the amount of smoke is 0.05v/v-0.5 v/v; the volume concentration of the medicament is 0.001-0.2% w/v; the medicament is anionic surfactant, nonionic surfactant or a compound of the anionic surfactant and the nonionic surfactant.
10. The method for the depth treatment of smoke plume according to claim 8, wherein the frequency of the sound field of the ultrasonic generator (9) is 0.5-5 kHz.
CN202011106600.8A 2020-10-15 2020-10-15 System and method for deeply treating smoke plume Pending CN112138517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011106600.8A CN112138517A (en) 2020-10-15 2020-10-15 System and method for deeply treating smoke plume

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011106600.8A CN112138517A (en) 2020-10-15 2020-10-15 System and method for deeply treating smoke plume

Publications (1)

Publication Number Publication Date
CN112138517A true CN112138517A (en) 2020-12-29

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CN202011106600.8A Pending CN112138517A (en) 2020-10-15 2020-10-15 System and method for deeply treating smoke plume

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