CN214361742U - Purification system for unorganized discharged flue gas of electrolytic plant skylight - Google Patents

Abstract

The utility model relates to a purification system for the unorganized emission of flue gas of a skylight in an electrolysis workshop, which comprises absorption liquid, a blending tank, a water inlet main pipe, a water inlet branch pipe, a spraying device, a drainage vertical pipe and a drainage horizontal pipe, wherein the absorption liquid is stored in the blending tank; the water inlet main pipes are arranged on two sides of the skylight ventilator of the electrolysis workshop, one end of each water inlet main pipe is communicated with the allocation groove through a water pump, and the other end of each water inlet main pipe is a closed port; the water inlet branch pipe is arranged on the water inlet main pipe, and the spraying device is arranged at the tail end of the water inlet branch pipe; the horizontal drainage pipe and the main water inlet pipe are arranged on two sides of the skylight ventilator of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe is arranged on the horizontal drainage pipe through a 45-degree inclined tee; the water inlet of the vertical water drainage pipe is communicated with the water drainage grooves on two sides of the ventilator of the skylight of the electrolysis workshop. The utility model discloses adsorb the processing to the flue gas that the electrolysis skylight unorganized was discharged, reach the purpose of purifying the flue gas, reduce pollutant emission, alleviate environmental pollution, provide the prerequisite for the pollutant recovery resourceization.

Description

Purification system for unorganized discharged flue gas of electrolytic plant skylight

Technical Field

The utility model belongs to the technical field of electrolytic aluminum flue gas waste gas treatment, especially, relate to a clean system of electrolysis shop skylight unorganized emission flue gas.

Background

In the production process of electrolytic aluminum, fluoride salt such as aluminum fluoride, cryolite and the like is melted into electrolyte at high temperature, and alumina is melted into the electrolyte. Under the action of DC current, electrochemical reaction takes place in the electrolytic bath, metallic aluminium is deposited at the cathode, fluoride in the electrolyte reacts with raw material and moisture in the air to generate HF, and reacts with carbon and sulfur element to generate CF₄、C₂F₆、SO₂And gaseous pollutants which emanate from the electrolytic cell and mix with fluoride dust from the production operation to form electrolysis fumes. Most of gaseous and solid fluorides in the electrolysis flue gas are collected by the gas collecting hood of the electrolysis bath and enter the flue gas purification system for treatment, but part of the flue gas still diffuses from the gap of the upper structure of the electrolysis bath and is discharged into the atmosphere in an unorganized way through the skylight of the electrolysis workshop, so that the environmental pollution is caused to a certain degree. The skylight area of the electrolysis workshop is large, and the unorganized gas flowability is strong, so that a system and a method for purifying flue gas which is inorganized and discharged from the electrolysis skylight are urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art exists, the utility model provides a purification system of electrolysis workshop skylight unorganized emission flue gas adsorbs the processing and collects the flue gas that the electrolysis skylight unorganized was discharged, reaches the purification flue gas, approaches zero excessive purpose, when reducing pollutant emission, alleviateing environmental pollution, provides the prerequisite for the pollutant recycling feasibility.

A purification system for the unorganized discharged flue gas of a skylight of an electrolysis workshop comprises an absorption liquid, a preparation tank, a water inlet main pipe, water inlet branch pipes, a spraying device, a water drainage vertical pipe and a water drainage horizontal pipe, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42% and is stored in the preparation tank; the water inlet main pipe is arranged on two sides of the skylight ventilator of the electrolysis workshop, one end of the water inlet main pipe is communicated with the blending tank through a water pump, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank, and the liquid level meter and the water pump are electrically connected with an electrolysis workshop control room; the water inlet branch pipes are arranged on the water inlet main pipe and communicated with the water inlet main pipe, the spraying devices are arranged at the tail ends of the water inlet branch pipes and communicated with the water inlet branch pipes, and the spraying direction points to the skylight ventilator of the electrolytic plant; a main control valve is arranged on a main water inlet pipe between the water pump and the spraying device, and branch control valves are arranged on branch water inlet pipes and are electrically connected with a control room of the electrolytic plant; the water inlet branch pipe is provided with a flowmeter which is electrically connected with a control room of the electrolytic plant; the horizontal drainage pipe and the main water inlet pipe are arranged on two sides of the skylight ventilator of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe is arranged on the horizontal drainage pipe through a 45-degree inclined tee joint, and a water inlet of the vertical drainage pipe is communicated with drainage grooves on two sides of a skylight ventilator of the electrolytic plant; the other end of the 45-degree inclined tee joint is connected with a rain drop pipe of the building body;

the spraying device is a spraying nozzle, the spraying angle of the spraying nozzle is 10-135 degrees, the particle size of spraying liquid drops is 0.1-1 mm, and the spraying shape is fan-shaped, hollow conical or filled conical.

The material of the preparation tank can not react with the absorption liquid.

The utility model has the advantages that:

1. the utility model discloses an alkali lye or sea water absorb electrolysis workshop unorganized emission flue gas, main flow is: the absorption liquid is prepared, pressurized, adsorbed, collected and the like, so that pollutants in the unorganized discharged flue gas of an electrolysis workshop are effectively treated, and the purification efficiency can reach more than 95%;

2. the utility model adopts the alkaline blending liquid, has little corrosion to the operation of the skylight and the equipment and is safe to use;

3. the utility model adopts the spraying nozzle to produce liquid drops with small volatilization and dispersion amount, and pollutants can be efficiently recovered;

4. the utility model discloses well absorption liquid can circulate and spray, and the quantity is little, does not influence the waterproof nature of ventilator, has flow control, cutout monitoring function.

Drawings

FIG. 1 is a schematic structural view of a flue gas purification system of the present invention;

fig. 2 is a schematic view of the spraying process of the present invention (side view of the skylight, where α is the spraying angle of the nozzle);

fig. 3 is a schematic view of a spraying state of the spray head of the present invention (wherein α is a spraying angle of the spray head);

wherein the content of the first and second substances,

1-a blending tank, 2-a water pump, 3-a water inlet main pipe, 4-a spraying device, 5-a ventilator, 6-a control main valve, 7-a drainage tank, 8-a drainage vertical pipe, 9-a drainage horizontal pipe, 10-a branch control valve, 11-45-degree inclined tee joints and 12-a water inlet branch pipe.

Detailed Description

For better explanation of the present invention, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings for better understanding.

Example 1

As shown in fig. 1-3, a purification system for a skylight of an electrolysis plant for disorderly discharging flue gas comprises an absorption liquid, a preparation tank 1, a water inlet main pipe 3, a water inlet branch pipe 12, a spray device 4, a water drainage vertical pipe 8 and a water drainage horizontal pipe 9, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42%, and is stored in the preparation tank 1; the blending tank 1 is used for storing blended absorption liquid, and the material of the blending tank cannot react with the absorption liquid; the water inlet main pipe 3 is arranged on two sides of a skylight ventilator 5 of the electrolytic plant, one end of the water inlet main pipe is communicated with the allocation tank 1 through a water pump 2, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank 1, the liquid level meter and the water pump 2 are electrically connected with an electrolysis workshop control room, the liquid level meter sends a liquid level signal of absorption liquid to the electrolysis workshop control room, and the electrolysis workshop control room controls the start and stop of the water pump 2 when the liquid level reaches a preset liquid level; the water inlet branch pipes 12 are arranged on the water inlet main pipe 3 and are communicated with the water inlet main pipe 3, the spraying devices 4 are arranged at the tail ends of the water inlet branch pipes 12 and are communicated with the water inlet branch pipes 12, the spraying direction points to the ventilator 5 of the skylight of the electrolytic plant, and the absorption liquid is pumped from the preparation tank 1 to the spraying devices 4 through the water pump 2 and is sprayed out to the ventilator 5; a main control valve 6 is arranged on a main water inlet pipe 3 between the water pump 2 and the spraying device 4, a branch control valve 10 is arranged on a branch water inlet pipe 12, and the branch control valve is electrically connected with a control room of the electrolysis workshop and used for the sectional maintenance of the spraying device 4; the horizontal drainage pipe 9 and the main water inlet pipe 3 are arranged on two sides of the skylight ventilator 5 of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank 1, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe 8 is arranged on the horizontal drainage pipe 9 through a 45-degree inclined tee 11, and a water inlet of the vertical drainage pipe 8 is communicated with drainage grooves 7 on two sides of the skylight ventilator 5 of the electrolytic plant; the other end of the 45-degree inclined tee joint 11 is connected with a rain drop pipe of the building body. The spraying device 4 is a spraying nozzle, the spraying angle of the spraying nozzle in the embodiment is 10 degrees, the particle size of the sprayed liquid drops is 0.1mm, and the spraying shape is a fan shape, a hollow cone shape or a filled cone shape, so that the normal air discharge is not influenced, and the liquid drops are fully contacted with the flue gas.

The water inlet branch pipes 12 are provided with flow meters which are electrically connected with the electrolysis workshop control room and have a cut-off monitoring function, when the flow meters monitor that the flow on a certain water inlet branch pipe 12 is abnormal, the electrolysis workshop control room controls the branch control valves 10 on the water inlet branch pipes 12 to be closed, so that the spraying device 4 is overhauled, the water outlet flow and pressure of each sprayer are controlled, and the sprayed absorption liquid is ensured to be in a proper particle size range and a reasonable liquid shape.

When raining, the water pump 2 is closed, the control main valve 6 on the water inlet main pipe 3 is closed at the same time, the purification system is closed, rainwater overflows and is discharged through the rain drop pipe, and the system is restarted after the rain is stopped.

The purification method of the purification system for the unorganized discharged flue gas of the skylight of the electrolysis workshop specifically comprises the following steps:

the method comprises the following steps: blending: in the embodiment, sodium hydroxide solution with the mass concentration of 0.1% prepared by sodium hydroxide solid or liquid caustic soda purchased from the market is used as absorption liquid and is stored in a preparation tank 1;

step two: pressurizing: pressurizing the prepared absorption liquid in the step one by a water pump 2, conveying the absorption liquid to a spraying device 4 through a water inlet main pipe 3 and a water inlet branch pipe 12, and providing necessary flow and pressure for the spraying device 4 by the water pump 2;

step three: purifying: the absorption liquid pressurized in the step two is sprayed out through the spraying device 4 and is fully contacted with the electrolytic flue gas exhausted by the ventilator 5, so that the flue gas pollutants are fully contacted and reacted with the absorption liquid, and the soluble substances in the flue gas are purified, and the principle is as follows:

NaOH+HF→NaF+H₂O

2NaOH+SO₂→Na₂SO₃+H₂O；

step four: collecting: in the third step, the absorption liquid fully contacted with the electrolytic flue gas is scattered along a rain baffle in the ventilator 5, collected to a drainage groove 7 of the ventilator 5, flows into a drainage vertical pipe 8 along the drainage groove 7, flows to a drainage horizontal pipe 9 through the drainage vertical pipe 8, finally flows back to the blending tank 1, is recycled until the absorption liquid is saturated, and then is subjected to impurity removal, fluorine removal, sulfur removal and calcium removal treatment by adopting a method disclosed in Chinese patent (application number: 201710484585.2, published: 2017, 10 and 17).

Example 2

As shown in fig. 1-3, a purification system for a skylight of an electrolysis plant for disorderly discharging flue gas comprises an absorption liquid, a preparation tank 1, a water inlet main pipe 3, a water inlet branch pipe 12, a spray device 4, a water drainage vertical pipe 8 and a water drainage horizontal pipe 9, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42%, and is stored in the preparation tank 1; the blending tank 1 is used for storing blended absorption liquid, and the material of the blending tank cannot react with the absorption liquid; the water inlet main pipe 3 is arranged on two sides of a skylight ventilator 5 of the electrolytic plant, one end of the water inlet main pipe is communicated with the allocation tank 1 through a water pump 2, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank 1, the liquid level meter and the water pump 2 are electrically connected with an electrolysis workshop control room, the liquid level meter sends a liquid level signal of absorption liquid to the electrolysis workshop control room, and the electrolysis workshop control room controls the start and stop of the water pump 2 when the liquid level reaches a preset liquid level; the water inlet branch pipes 12 are arranged on the water inlet main pipe 3 and are communicated with the water inlet main pipe 3, the spraying devices 4 are arranged at the tail ends of the water inlet branch pipes 12 and are communicated with the water inlet branch pipes 12, the spraying direction points to the ventilator 5 of the skylight of the electrolytic plant, and the absorption liquid is pumped from the preparation tank 1 to the spraying devices 4 through the water pump 2 and is sprayed out to the ventilator 5; a main control valve 6 is arranged on a main water inlet pipe 3 between the water pump 2 and the spraying device 4, a branch control valve 10 is arranged on a branch water inlet pipe 12, and the branch control valve is electrically connected with a control room of the electrolysis workshop and used for the sectional maintenance of the spraying device 4; the horizontal drainage pipe 9 and the main water inlet pipe 3 are arranged on two sides of the skylight ventilator 5 of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank 1, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe 8 is arranged on the horizontal drainage pipe 9 through a 45-degree inclined tee 11, and a water inlet of the vertical drainage pipe 8 is communicated with drainage grooves 7 on two sides of the skylight ventilator 5 of the electrolytic plant; the other end of the 45-degree inclined tee joint 11 is connected with a rain drop pipe of the building body. The spraying device 4 is a spraying nozzle, the spraying angle of the spraying nozzle in the embodiment is 50 degrees, the particle size of the sprayed liquid drops is 0.4mm, and the spraying shape is a fan shape, a hollow cone shape or a filled cone shape, so that the normal air discharge is not influenced, and the liquid drops are fully contacted with the flue gas.

The water inlet branch pipes 12 are provided with flow meters which are electrically connected with the electrolysis workshop control room and have a cut-off monitoring function, when the flow meters monitor that the flow on a certain water inlet branch pipe 12 is abnormal, the electrolysis workshop control room controls the branch control valves 10 on the water inlet branch pipes 12 to be closed, so that the spraying device 4 is overhauled, the water outlet flow and pressure of each sprayer are controlled, and the sprayed absorption liquid is ensured to be in a proper particle size range and a reasonable liquid shape.

When raining, the water pump 2 is closed, the control main valve 6 on the water inlet main pipe 3 is closed at the same time, the purification system is closed, rainwater overflows and is discharged through the rain drop pipe, and the system is restarted after the rain is stopped.

The purification method of the purification system for the unorganized discharged flue gas of the skylight of the electrolysis workshop specifically comprises the following steps:

the method comprises the following steps: blending: in the embodiment, sodium hydroxide solution with the mass concentration of 1% prepared by sodium hydroxide solid or liquid caustic soda purchased from the market is used as absorption liquid and is stored in a preparation tank 1;

step two: pressurizing: pressurizing the prepared absorption liquid in the step one by a water pump 2, conveying the absorption liquid to a spraying device 4 through a water inlet main pipe 3 and a water inlet branch pipe 12, and providing necessary flow and pressure for the spraying device 4 by the water pump 2;

step three: purifying: the absorption liquid pressurized in the step two is sprayed out through the spraying device 4 and is fully contacted with the electrolytic flue gas exhausted by the ventilator 5, so that the flue gas pollutants are fully contacted and reacted with the absorption liquid, and the soluble substances in the flue gas are purified, and the principle is as follows:

NaOH+HF→NaF+H₂O

2NaOH+SO₂→Na₂SO₃+H₂O；

step four: collecting: in the third step, the absorption liquid fully contacted with the electrolytic flue gas is scattered along a rain baffle in the ventilator 5, collected to a drainage groove 7 of the ventilator 5, flows into a drainage vertical pipe 8 along the drainage groove 7, flows to a drainage horizontal pipe 9 through the drainage vertical pipe 8, finally flows back to the blending tank 1, is recycled until the absorption liquid is saturated, and then is subjected to impurity removal, fluorine removal, sulfur removal and calcium removal treatment by adopting a method disclosed in Chinese patent (application number: 201710484585.2, published: 2017, 10 and 17).

Example 3

As shown in fig. 1-3, a purification system for a skylight of an electrolysis plant for disorderly discharging flue gas comprises an absorption liquid, a preparation tank 1, a water inlet main pipe 3, a water inlet branch pipe 12, a spray device 4, a water drainage vertical pipe 8 and a water drainage horizontal pipe 9, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42%, and is stored in the preparation tank 1; the blending tank 1 is used for storing blended absorption liquid, and the material of the blending tank cannot react with the absorption liquid; the water inlet main pipe 3 is arranged on two sides of a skylight ventilator 5 of the electrolytic plant, one end of the water inlet main pipe is communicated with the allocation tank 1 through a water pump 2, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank 1, the liquid level meter and the water pump 2 are electrically connected with an electrolysis workshop control room, the liquid level meter sends a liquid level signal of absorption liquid to the electrolysis workshop control room, and the electrolysis workshop control room controls the start and stop of the water pump 2 when the liquid level reaches a preset liquid level; the water inlet branch pipes 12 are arranged on the water inlet main pipe 3 and are communicated with the water inlet main pipe 3, the spraying devices 4 are arranged at the tail ends of the water inlet branch pipes 12 and are communicated with the water inlet branch pipes 12, the spraying direction points to the ventilator 5 of the skylight of the electrolytic plant, and the absorption liquid is pumped from the preparation tank 1 to the spraying devices 4 through the water pump 2 and is sprayed out to the ventilator 5; a main control valve 6 is arranged on a main water inlet pipe 3 between the water pump 2 and the spraying device 4, a branch control valve 10 is arranged on a branch water inlet pipe 12, and the branch control valve is electrically connected with a control room of the electrolysis workshop and used for the sectional maintenance of the spraying device 4; the horizontal drainage pipe 9 and the main water inlet pipe 3 are arranged on two sides of the skylight ventilator 5 of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank 1, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe 8 is arranged on the horizontal drainage pipe 9 through a 45-degree inclined tee 11, and a water inlet of the vertical drainage pipe 8 is communicated with drainage grooves 7 on two sides of the skylight ventilator 5 of the electrolytic plant; the other end of the 45-degree inclined tee joint 11 is connected with a rain drop pipe of the building body. The spraying device 4 is a spraying nozzle, the spraying angle of the spraying nozzle in the embodiment is 100 degrees, the particle size of the sprayed liquid drops is 0.7mm, and the spraying shape is a fan shape, a hollow cone shape or a filled cone shape, so that the normal air discharge is not influenced, and the liquid drops are fully contacted with the flue gas.

The water inlet branch pipes 12 are provided with flow meters which are electrically connected with the electrolysis workshop control room and have a cut-off monitoring function, when the flow meters monitor that the flow on a certain water inlet branch pipe 12 is abnormal, the electrolysis workshop control room controls the branch control valves 10 on the water inlet branch pipes 12 to be closed, so that the spraying device 4 is overhauled, the water outlet flow and pressure of each sprayer are controlled, and the sprayed absorption liquid is ensured to be in a proper particle size range and a reasonable liquid shape.

When raining, the water pump 2 is closed, the control main valve 6 on the water inlet main pipe 3 is closed at the same time, the purification system is closed, rainwater overflows and is discharged through the rain drop pipe, and the system is restarted after the rain is stopped.

The purification method of the purification system for the unorganized discharged flue gas of the skylight of the electrolysis workshop specifically comprises the following steps:

the method comprises the following steps: blending: in the embodiment, sodium hydroxide solution with the mass concentration of 38% prepared by sodium hydroxide solid or liquid caustic soda purchased from the market is used as absorption liquid and is stored in a preparation tank 1;

step two: pressurizing: pressurizing the prepared absorption liquid in the step one by a water pump 2, conveying the absorption liquid to a spraying device 4 through a water inlet main pipe 3 and a water inlet branch pipe 12, and providing necessary flow and pressure for the spraying device 4 by the water pump 2;

step three: purifying: the absorption liquid pressurized in the step two is sprayed out through the spraying device 4 and is fully contacted with the electrolytic flue gas exhausted by the ventilator 5, so that the flue gas pollutants are fully contacted and reacted with the absorption liquid, and the soluble substances in the flue gas are purified, and the principle is as follows:

NaOH+HF→NaF+H₂O

2NaOH+SO₂→Na₂SO₃+H₂O；

step four: collecting: in the third step, the absorption liquid fully contacted with the electrolytic flue gas is scattered along a rain baffle in the ventilator 5, collected to a drainage groove 7 of the ventilator 5, flows into a drainage vertical pipe 8 along the drainage groove 7, flows to a drainage horizontal pipe 9 through the drainage vertical pipe 8, finally flows back to the blending tank 1, is recycled until the absorption liquid is saturated, and then is subjected to impurity removal, fluorine removal, sulfur removal and calcium removal treatment by adopting a method disclosed in Chinese patent (application number: 201710484585.2, published: 2017, 10 and 17).

Example 4

As shown in fig. 1-3, a purification system for a skylight of an electrolysis plant for disorderly discharging flue gas comprises an absorption liquid, a preparation tank 1, a water inlet main pipe 3, a water inlet branch pipe 12, a spray device 4, a water drainage vertical pipe 8 and a water drainage horizontal pipe 9, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42%, and is stored in the preparation tank 1; the blending tank 1 is used for storing blended absorption liquid, and the material of the blending tank cannot react with the absorption liquid; the water inlet main pipe 3 is arranged on two sides of a skylight ventilator 5 of the electrolytic plant, one end of the water inlet main pipe is communicated with the allocation tank 1 through a water pump 2, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank 1, the liquid level meter and the water pump 2 are electrically connected with an electrolysis workshop control room, the liquid level meter sends a liquid level signal of absorption liquid to the electrolysis workshop control room, and the electrolysis workshop control room controls the start and stop of the water pump 2 when the liquid level reaches a preset liquid level; the water inlet branch pipes 12 are arranged on the water inlet main pipe 3 and are communicated with the water inlet main pipe 3, the spraying devices 4 are arranged at the tail ends of the water inlet branch pipes 12 and are communicated with the water inlet branch pipes 12, the spraying direction points to the ventilator 5 of the skylight of the electrolytic plant, and the absorption liquid is pumped from the preparation tank 1 to the spraying devices 4 through the water pump 2 and is sprayed out to the ventilator 5; a main control valve 6 is arranged on a main water inlet pipe 3 between the water pump 2 and the spraying device 4, a branch control valve 10 is arranged on a branch water inlet pipe 12, and the branch control valve is electrically connected with a control room of the electrolysis workshop and used for the sectional maintenance of the spraying device 4; the horizontal drainage pipe 9 and the main water inlet pipe 3 are arranged on two sides of the skylight ventilator 5 of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank 1, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe 8 is arranged on the horizontal drainage pipe 9 through a 45-degree inclined tee 11, and a water inlet of the vertical drainage pipe 8 is communicated with drainage grooves 7 on two sides of the skylight ventilator 5 of the electrolytic plant; the other end of the 45-degree inclined tee joint 11 is connected with a rain drop pipe of the building body. The spraying device 4 is a spraying nozzle, the spraying angle of the spraying nozzle in the embodiment is 135 degrees, the particle size of the sprayed liquid drops is 1mm, and the spraying shape is fan-shaped, hollow conical or filled conical, so that the normal air discharge is not influenced, and the liquid drops are fully contacted with the flue gas.

The water inlet branch pipes 12 are provided with flow meters which are electrically connected with the electrolysis workshop control room and have a cut-off monitoring function, when the flow meters monitor that the flow on a certain water inlet branch pipe 12 is abnormal, the electrolysis workshop control room controls the branch control valves 10 on the water inlet branch pipes 12 to be closed, so that the spraying device 4 is overhauled, the water outlet flow and pressure of each sprayer are controlled, and the sprayed absorption liquid is ensured to be in a proper particle size range and a reasonable liquid shape.

When raining, the water pump 2 is closed, the control main valve 6 on the water inlet main pipe 3 is closed at the same time, the purification system is closed, rainwater overflows and is discharged through the rain drop pipe, and the system is restarted after the rain is stopped.

The purification method of the purification system for the unorganized discharged flue gas of the skylight of the electrolysis workshop specifically comprises the following steps:

the method comprises the following steps: blending: in the embodiment, seawater is used as an absorption liquid and is stored in the blending tank 1;

step two: pressurizing: pressurizing the prepared absorption liquid in the step one by a water pump 2, conveying the absorption liquid to a spraying device 4 through a water inlet main pipe 3 and a water inlet branch pipe 12, and providing necessary flow and pressure for the spraying device 4 by the water pump 2;

step three: purifying: the absorption liquid pressurized in the step two is sprayed out through the spraying device 4 and is fully contacted with the electrolytic flue gas exhausted by the ventilator 5, so that the flue gas pollutants are fully contacted and reacted with the absorption liquid, and the soluble substances in the flue gas are purified, and the principle is as follows:

NaOH+HF→NaF+H₂O

2NaOH+SO₂→Na₂SO₃+H₂O；

step four: collecting: in the third step, the absorption liquid fully contacted with the electrolytic flue gas is scattered along a rain baffle in the ventilator 5, collected to a drainage groove 7 of the ventilator 5, flows into a drainage vertical pipe 8 along the drainage groove 7, flows to a drainage horizontal pipe 9 through the drainage vertical pipe 8, finally flows back to the blending tank 1, is recycled until the absorption liquid is saturated, and then is subjected to impurity removal, fluorine removal, sulfur removal and calcium removal treatment by adopting a method disclosed in Chinese patent (application number: 201710484585.2, published: 2017, 10 and 17).

Claims (2)

1. The utility model provides a clean system of electrolysis workshop skylight unorganized emission flue gas which characterized in that: the device comprises an absorption liquid, a preparation tank, a water inlet main pipe, water inlet branch pipes, a spraying device, a vertical drainage pipe and a horizontal drainage pipe, wherein the absorption liquid is a sodium hydroxide solution or seawater with the mass concentration of 0.1-42% and is stored in the preparation tank; the water inlet main pipe is arranged on two sides of the skylight ventilator of the electrolysis workshop, one end of the water inlet main pipe is communicated with the blending tank through a water pump, and the other end of the water inlet main pipe is a closed port; a liquid level meter is arranged in the blending tank, and the liquid level meter and the water pump are electrically connected with an electrolysis workshop control room; the water inlet branch pipes are arranged on the water inlet main pipe and communicated with the water inlet main pipe, the spraying devices are arranged at the tail ends of the water inlet branch pipes and communicated with the water inlet branch pipes, and the spraying direction points to the skylight ventilator of the electrolytic plant; a main control valve is arranged on a main water inlet pipe between the water pump and the spraying device, and branch control valves are arranged on branch water inlet pipes and are electrically connected with a control room of the electrolytic plant; the water inlet branch pipe is provided with a flowmeter which is electrically connected with a control room of the electrolytic plant; the horizontal drainage pipe and the main water inlet pipe are arranged on two sides of the skylight ventilator of the electrolysis workshop in parallel, one end of the horizontal drainage pipe is communicated with the blending tank, and the other end of the horizontal drainage pipe is a closed port; the vertical drainage pipe is arranged on the horizontal drainage pipe through a 45-degree inclined tee joint, and a water inlet of the vertical drainage pipe is communicated with drainage grooves on two sides of a skylight ventilator of the electrolytic plant; the other end of the 45-degree inclined tee joint is connected with a rain drop pipe of the building body;

the spraying device is a spraying nozzle, the spraying angle of the spraying nozzle is 10-135 degrees, the particle size of spraying liquid drops is 0.1-1 mm, and the spraying shape is fan-shaped, hollow conical or filled conical.

2. The purification system for the skylight disorganized exhaust smoke of the electrolytic plant as claimed in claim 1, wherein: the material of the preparation tank can not react with the absorption liquid.

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