CN112138517A - A system and method for deep plume control - Google Patents

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

A system and method for deep plume control

technical field

The invention relates to the field of environmental protection, in particular to a system and method for deep treatment of smoke plumes.

Background technique

At present, 90% of the domestic desulfurization process adopts wet desulfurization. Since the net flue gas at the outlet of the absorption tower of the wet flue gas desulfurization system is in a wet saturated state, the temperature decreases during the process of flowing through the flue and chimney and discharging into the atmosphere, and the flue gas is in the flue gas. Part of the vaporous water and pollutants will condense, forming mist-like water vapor at the chimney mouth, and the mist-like water vapor will change slightly in color due to the background color of the sky, sky illumination, viewing angle, etc., forming colored plumes.

Shanghai, Zhejiang and other places have successively issued the local environmental protection standard "Emission Standard of Air Pollutants for Coal-fired Power Plants", which clearly requires coal-fired power plants to take effective measures to eliminate colored plumes. That is, by adopting corresponding technologies to reduce the moisture content of the emitted flue gas, collect the supersaturated water vapor moisture in the flue gas, and reduce the emission of condensable particulate matter such as soluble salts, sulfuric acid mist, and organic matter in the flue gas.

The technical route of sampling flue gas condensation and reheating is currently a commonly used flue gas treatment scheme. This solution can effectively reduce the emission temperature and moisture content of flue gas, collect the moisture in the supersaturated water vapor in the flue gas, and reduce the emission of condensable particulate matter such as soluble salts, sulfuric acid mist, and organic matter in the flue gas. At present, the flue gas condensation technology mostly adopts the flue condensing tube heat exchanger at the outlet flue of the desulfurization tower or the slurry plate heat exchanger at the slurry circulation pipeline. It is difficult to arrange the flue condensing tube heat exchanger in the flue space between the inlets, and the arrangement position of the flue condensing tube heat exchanger is high, the power consumption of the supporting circulating water pump is large, the amount of renovation works is large, and the maintenance is difficult; the slurry circulation pipeline The space is limited, which increases the resistance along the path of the slurry in the circulating pipeline, and the slurry plate heat exchanger is at risk of blockage. When the heat exchanger fails, the corresponding slurry circulating pump needs to be shut down.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the prior art, the present invention provides a system and method for in-depth treatment of smoke plumes, which has reasonable design, simple structure, and can effectively eliminate white smoke plumes.

The present invention is achieved through the following technical solutions:

A system for in-depth treatment of smoke plumes, comprising an ultrasonic agglomeration system, a pharmaceutical drop system and a pharmaceutical injection system, which are sequentially installed on the outlet flue of a desulfurization tower along the direction of the flue gas, and a pharmaceutical supply system connected with the pharmaceutical drop system;

The ultrasonic agglomeration system is arranged at the smoke inlet of the outlet flue; the pharmaceutical injection system is arranged at the smoke outlet of the outlet flue, and the spraying direction of the medicine is opposite to the direction of the smoke;

The medicament drop system includes a medicament drop pool; the medicament drop pool communicates with the bottom of the outlet flue arranged between the ultrasonic agglomeration system and the medicament injection system, and is connected to the medicament supply system.

Further, the medicament injection system includes at least one medicament injection layer distributed at the flue gas outlet of the outlet flue; several medicament nozzles are evenly distributed on each layer of the medicament injection layer, and the injection direction is opposite to the direction of the flue gas. The lift range is 3-5m.

Furthermore, the medicament nozzle is connected to the medicament drop pool through a medicament spray pump.

Further, the ultrasonic agglomeration system includes a plurality of ultrasonic generating devices distributed at the flue gas inlet of the outlet flue; the ultrasonic generating devices are arranged on the opposite side of the medicament nozzle, and the distance from the medicament nozzle is in the range of 3-4m.

Further, a medicament discharge port is provided at the bottom of the medicament falling pool, and the upper part is connected with a medicament supply system.

Further, the medicament supply system includes a medicament pool, which is communicated with the medicament drop pool through a medicament feeding pump, and the medicament contained therein is at least one of an anionic surfactant and a non-ionic surfactant.

A method for in-depth treatment of smoke plumes. The chemical injection system sprays the chemical in the chemical falling system into the outlet flue. When the flue gas from the outlet of the desulfurization tower enters the outlet flue, it is in reverse convection contact with the chemical sprayed by the chemical injection system. Transform wet saturated flue gas into a supersaturated state, and agglomerate water vapor, fine particles and trace pollutants in wet flue gas;

Under the action of the ultrasonic agglomeration system, the agglomeration of water vapor, fine particles and trace pollutants in the wet flue gas becomes larger;

Under the action of gravity, it falls into the medicine drop system together with the medicine to complete the deep control of the plume.

Further, when the medicine in the medicine returning pool of the medicine returning system is consumed to a set level, the medicine pool of the medicine supplying system replenishes the medicine returning pool with fresh medicine.

Further, the liquid-to-gas ratio of the spray amount of the medicament to the flue gas is 0.05v/v-0.5v/v; the volume concentration of the medicament is 0.001%-0.2%w/v; the medicament is an anionic surfactant, Nonionic surfactants or a combination of the two.

Furthermore, the frequency of the sound field of the ultrasonic generating device is 0.5-5 kHz.

Compared with the prior art, the present invention has the following beneficial technical effects:

The system of the present invention adopts the method of setting a chemical injection system and an ultrasonic agglomeration system at the outlet flue of the desulfurization tower, so that after the flue gas at the outlet of the desulfurization tower passes through the system of the present invention, it is in reverse convection contact with the chemical sprayed by the chemical injection system. On the one hand, the atomized spray of the medicament further reduces the smoke temperature and promotes the transformation of the wet saturated flue gas into a supersaturated state. At the same time, 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 become larger, and finally, under the action of gravity, it falls into the drug drop pool together with the drug, and at the same time To achieve the purpose of deep plume treatment, it can effectively remove soluble salts in the flue gas, and the removal rate is as high as 98%.

Further, the spraying direction of the medicament in the medicament nozzle of the system of the present invention is opposite to the direction of the flue gas, and the reverse spray is required to increase the mass transfer effect; the spray head of the medicament is 3-5 meters, which ensures the residence reaction time of the medicament and the wet flue gas. .

Further, the ultrasonic generating device used in the system of the present invention requires the formation of a low-frequency standing wave sound field in the flue to promote relative movement, collision and agglomeration of water vapor, fine particles and trace pollutants in the flue gas at the outlet of the desulfurization tower.

Description of drawings

FIG. 1 is a schematic diagram of the structure described in the embodiment of the present invention.

In the figure: desulfurization tower 1, chemical tank 2, chemical feed pump 3, chemical drop tank 4, chemical spray pump 5, chemical discharge port 6, chemical nozzle 7, outlet flue 8, ultrasonic generator 9.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments, which are to explain rather than limit the present invention.

A system for deep plume treatment according to the present invention, as shown in FIG. 1 , includes an ultrasonic agglomeration system, a medicament fallback system, a medicament supply system and a medicament injection system installed along the outlet flue 8 of the desulfurization tower 1;

The ultrasonic agglomeration system is arranged at the flue gas inlet of the outlet flue 8, and includes an ultrasonic generating device 9; there are at least two ultrasonic generating devices 9, which are symmetrically distributed on both sides of the flue gas inlet of the outlet flue 8, and are the same as those of the flue gas inlet. The medicine nozzle 7 is facing directly, and the distance from the medicine nozzle 7 is in the range of 3-4m.

The medicament fallback system is arranged on the outlet flue 8 between the ultrasonic agglomeration system and the medicament injection system, and is connected to the medicament supply system; the medicament fallback system includes a medicament fallback pool 4, a medicament spray pump 5, and a medicament fallback pool 4. The medicament discharge port 6 at the bottom; the medicament drop pool 4 communicates with the bottom of the outlet flue 8 arranged between the medicament nozzle 7 and the ultrasonic generating device 9 , and communicates with the medicament nozzle 7 through the medicament spray pump 5 .

The medicament supply system includes a medicament pool 2 and a medicament feed pump 3; the medicament pool 2 is communicated with the medicament drop pool 4 through the medicament feed pump 3, and the medicament contained therein is an anionic surfactant with a concentration of 0.001%-0.2%. , nonionic surfactants or a combination of the two.

The medicament injection system is arranged at the flue gas outlet of the outlet flue 8, and its medicament spraying direction is opposite to the direction of the flue gas; the medicament injection system includes a medicament spray layer, a medicament nozzle 7 and a medicament spray pump 5; the medicament spray layer At least one layer is distributed at the flue gas outlet of the outlet flue 8; each layer of medicament spray layer is evenly distributed with several medicament nozzles 7 connected to the medicament drop system through the medicament spray pump 5, and the spray direction is opposite to the direction of the flue gas. The range is 3-5m.

Wherein, the medicament is one or more compounding of environment-friendly anionic surfactant and nonionic surfactant, and its use concentration is 0.001%-0.2% w/v;

Among them, the medicament in the medicament drop pool 4 can be reused. When the medicament in the medicament solution is consumed to a certain level, fresh medicament can be added to the medicament drop pool to continue the deep treatment of the plume.

A method for deep treatment of plume of the present invention is as follows,

The agent injection system sprays the agent in the agent drop system into the outlet flue 8. When the flue gas from the outlet of the desulfurization tower 1 enters the outlet flue 8, it contacts the agent atomized and sprayed by the agent injection system in reverse convection, so that the wet saturated flue gas is in contact with each other. Transform into a supersaturated state, and agglomerate the water vapor, fine particles, and trace pollutants in the wet flue gas; at the same time, under the action of the ultrasonic agglomeration system, further promote the water vapor, fine particles, and trace pollutants in the wet flue gas. The agglomeration becomes larger, and finally, under the action of gravity, it falls into the medicine drop system together with the medicine to complete the deep management of the plume.

The medicament in the medicament drop pool 4 of the medicament return system is reused. When the medicament in the medicament drop pool 4 of the medicament drop system is consumed to a certain extent, the medicament pool 2 of the medicament supply system replenishes the medicament drop pool 4 with fresh medicament.

Among them, the liquid-to-gas ratio of the spray amount of the agent to the flue gas is 0.05v/v-0.5v/v, and the agent used in the agent pool 2 is an anionic surfactant, a nonionic surfactant or a combination of the two. The concentration of active agent is 0.001%-0.2% w/v.

The frequency of the sound field of the ultrasonic generating device 9 is adjustable within 0.5-5 kHz.

In this preferred embodiment, the amount of flue gas discharged from the coal-fired boiler through the desulfurization tower 1 is 5000 m ³ /h. Before using the system of the present invention, obvious white smoke can be seen, and the soluble matter test of the white plume is carried out, and the content of the soluble matter is 10.5 mg/m ³ ; after the system of the present invention is used, the medicament is 0.05% The mixture of sodium lauryl sulfate and 0.05% alkylphenol polyoxyethylene ether, the liquid-gas ratio of the spray amount of the agent and the flue gas is 0.5v/v, and the frequency of the ultrasonic sound field is 1.5kHz, which is not only invisible to the naked eye. smoke, and the content of soluble matter in the smoke was measured to be 0.37 g/m ³ .

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.

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