Chemical tail gas purification tower and purification method

Abstract

The invention provides a chemical tail gas purification tower and a purification method, the chemical tail gas purification tower comprises a pulse dust collector and a purification tower, the pulse dust collector is connected with the purification tower, the purification tower is sequentially provided with a tail gas absorption pool, a spray absorption pool, a desulfurization and denitrification device and an activated carbon absorption box from bottom to top, the tail gas absorption pool contains a tail gas absorption liquid, and the spray absorption pool is connected with the activated carbon absorption box. The air outlet end of the pulse dust collector is connected into the tail gas absorption liquid through a pipeline, the circulating unit comprises a liquid storage tank, and the liquid storage tank is respectively connected with the tail gas absorption pool and the spraying absorption pool through pipelines. The tail gas treatment device is simple in structure, particle emissions in tail gas are removed through the pulse dust collector, harmful substances such as nitric oxide in the tail gas are removed through the tail gas adsorption pool and the spraying adsorption pool, desulfurization and denitrification treatment is conducted through the desulfurization and denitrification device, and finally organic matter, peculiar smell and the like in the tail gas are absorbed through activated carbon, so that comprehensive treatment is basically achieved; the treatment effect is good and the application range is wide.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical tail gas treatment, and in particular relates to a chemical tail gas purification tower and a purification method. Background Art

[0002] With the rapid development and continuous expansion of the chemical industry, tail gas emissions have become an increasingly serious environmental problem. Chemical tail gas contains a large amount of harmful substances and pollutants, which cause serious harm to human health and the environment. Therefore, it is particularly important to develop and apply effective chemical tail gas treatment solutions.

[0003] However, the existing chemical waste gas collection and treatment equipment has a slow purification efficiency, which easily leads to the problem of secondary gas pollution. At the same time, the existing chemical waste gas collection and treatment equipment has a single treatment type. Most of the equipment can only treat one type of chemical waste gas, and the treatment cost is relatively high. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a chemical tail gas purification tower and purification method, which has a simple structure, removes particulate emissions in the tail gas through a pulse dust collector, removes nitrogen oxides and other harmful substances in the tail gas through a tail gas adsorption tank and a spray adsorption tank, and then uses a desulfurization and denitrification device for desulfurization and denitrification treatment, and finally uses activated carbon to absorb organic matter, odor, etc. in the tail gas, which basically realizes comprehensive treatment, has good treatment effect, and has a wide range of applications.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a chemical tail gas purification tower, including a pulse dust collector and a purification tower, the pulse dust collector is connected to the purification tower, the purification tower is provided with a tail gas absorption tank, a spray absorption tank, a desulfurization and denitrification device and an activated carbon absorption box from bottom to top, the tail gas absorption tank is filled with tail gas absorption liquid, the air outlet end of the pulse dust collector is connected to the tail gas absorption liquid through a pipeline, and also includes a circulation unit, the circulation unit includes a liquid storage tank, and the liquid storage tank is respectively connected to the tail gas absorption tank and the spray absorption tank through pipelines.

[0006] Furthermore, the air inlet of the pulse dust collector is provided with an anti-backblowing device, and the anti-backblowing device includes a windshield provided on the air inlet duct, and the number of the windshield is at least one, and the windshield is rotatably mounted on the air inlet duct through a pin shaft. When the pulse dust collector is backblowing, the baffle causes the air inlet duct to be temporarily closed to prevent harmful exhaust gas from escaping from the front end.

[0007] Furthermore, a wind hood is provided at the end of the air outlet duct of the pulse dust collector, a cover plate is provided in the tail gas absorption tank, the wind hood is located inside the cover plate, and a number of small holes are evenly distributed on the cover plate; a swirl plate is provided on the upper part of the tail gas absorption tank. The chemical tail gas enters the cover plate through the wind hood, and a number of small holes are evenly distributed on the cover plate to slow down the speed of the chemical tail gas, and on the other hand, the chemical tail gas can be diffused, so that the tail gas can react more fully with the absorption liquid in the tail gas absorption tank, thereby improving the absorption effect.

[0008] Furthermore, the spray absorption pool is connected to the tail gas absorption pool, and a plurality of baffles are vertically arranged in the spray absorption pool, and a return gas channel is formed in the baffle spray absorption pool, and a nozzle is arranged at the top of the spray absorption pool, and at least one nozzle is arranged between the baffles, and the bottom of the spray absorption pool is inclined. The spray absorption pool performs secondary absorption on the tail gas, and the baffles increase the path of the tail gas through the spray absorption pool, so that the tail gas stays in the spray absorption pool for a longer time and reacts more fully.

[0009] Furthermore, the circulation unit further comprises a liquid outlet pipe and a liquid return pipe, the liquid outlet pipe is provided with a circulation pump, the inlet end of the circulation pump is respectively connected to the tail gas absorption tank and the liquid storage tank, the outlet end of the circulation pump is connected to the spray head, and a valve is arranged on the connecting pipe; one end of the liquid return pipe is connected to the lowest end of the bottom of the spray absorption tank, and the other end is respectively connected to the tail gas adsorption tank and the liquid storage tank through a three-way valve. The circulation unit can recycle the liquid in the tail gas absorption tank and the liquid in the liquid storage tank.

[0010] Furthermore, the spray adsorption pool is connected to the desulfurization and denitration device, and the desulfurization and denitration device is connected to the activated carbon absorption box, and the activated carbon absorption box is provided with a first activated carbon absorption plate and a second activated carbon absorption plate, and the first activated carbon absorption plate and the second activated carbon absorption plate are both arc-shaped. The arc-shaped activated carbon absorption plate can increase the contact area with the tail gas in the same space, and the absorption effect is better.

[0011] Furthermore, a first induced draft fan is provided on the pipeline connecting the pulse dust collector and the purification tower, a second induced draft fan is provided at the top outlet of the activated carbon absorption box, and the second induced draft fan is connected to an exhaust pipe.

[0012] Furthermore, the first induced draft fan and the second induced draft fan are both corrosion-resistant fans.

[0013] A chemical tail gas purification method comprises: the chemical tail gas first enters a pulse dust collector, through which solid particles and dust are removed, and then the tail gas enters a tail gas adsorption pool under the action of a first induced draft fan to absorb harmful substances therein, and then passes through a spray absorption pool for further absorption, the treated tail gas enters a desulfurization and denitrification device for desulfurization and denitrification treatment, and finally the tail gas enters an activated carbon absorption box for absorption and then is discharged.

[0014] It can be seen from the above technical solution that the present invention has the following beneficial effects: 1. The present invention provides a chemical tail gas purification tower and purification method, which have a simple structure, remove particulate emissions in the tail gas through a pulse dust collector, remove harmful substances such as nitrogen oxides in the tail gas through a tail gas adsorption tank and a spray adsorption tank, and then use a desulfurization and denitrification device to perform desulfurization and denitrification treatment, and finally use activated carbon to absorb organic matter, odor, etc. in the tail gas, which basically realizes comprehensive treatment, has good treatment effect, and has a wide range of applications.

[0015] 2. The present invention also provides a circulation unit. When in use, different absorption liquids can be added to the tail gas absorption tank according to the type of chemical tail gas. According to the tail gas components after being treated in the tail gas absorption tank, the same absorption liquid or different absorption liquids can be added to the liquid storage tank. The use method can be flexible and varied.

[0016] 3. The pulse dust collector of the present invention is equipped with an anti-backblowing device, which can temporarily close the air intake duct when the pulse dust collector is backblowing, so that the exhaust gas at the front end will not partially escape and pollute the environment due to backblowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a chemical tail gas purification tower according to the present invention. Figure 2 It is a schematic structural diagram of the anti-backblowing device described in the present invention.

[0018] In the figure: 1-pulse dust collector, 11-anti-backblowing device, 111-baffle, 2-purification tower, 21-tail gas absorption tank, 211-wind hood, 212-cover plate, 22-spray absorption tank, 221-partition, 222-nozzle, 23-desulfurization and denitrification device, 24-activated carbon absorption box, 241-first activated carbon plate, 242-second activated carbon plate, 3-circulation unit, 31-liquid storage tank, 32-liquid outlet pipe, 321-circulation pump, 33-return liquid pipe, 331-three-way valve, 4-first induced draft fan, 5-second induced draft fan. DETAILED DESCRIPTION

[0019] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0020] like Figure 1-2As shown, a chemical tail gas purification tower includes a pulse dust collector 1 and a purification tower 2, wherein the pulse dust collector 1 is connected to the purification tower 2, and the purification tower 2 is provided with a tail gas absorption tank 21, a spray absorption tank 22, a desulfurization and denitrification device 23 and an activated carbon absorption box 24 from bottom to top, wherein the tail gas absorption tank 21 contains tail gas absorption liquid, and the air outlet end of the pulse dust collector 1 is connected to the tail gas absorption liquid through a pipeline, and further includes a circulation unit 3, wherein the circulation unit 3 includes a liquid storage tank 31, and the liquid storage tank 31 is respectively connected to the tail gas absorption tank 21 and the spray absorption tank 22 through pipelines. The particulate emissions in the tail gas are removed by the pulse dust collector 1, the nitrogen oxides and other harmful substances in the tail gas are removed by the tail gas adsorption tank 21 and the spray adsorption tank 22, and then the desulfurization and denitrification device 23 is used for desulfurization and denitrification treatment, and finally the organic matter and odor in the tail gas are absorbed by activated carbon, thereby basically realizing comprehensive treatment, having good treatment effect and wide application range.

[0021] Preferably, Figure 2 As shown, the air inlet of the pulse dust collector 1 is provided with an anti-backblowing device 11, and the anti-backblowing device 11 includes a windshield 111 arranged on the air inlet duct. The number of the windshield 111 is at least one, and the windshield 111 is rotatably mounted on the air inlet duct through a pin shaft. Since the exhaust gas treatment system is a closed system, its gas flow direction is from the generation end to the treatment end. However, when the pulse dust collector 1 back-blows and vibrates off the dust on the bag, it will cause the exhaust gas in the front-end pipe to flow in the opposite direction and finally escape to pollute the environment. After the anti-backblowing device 11 is installed, under normal circumstances, the baffle 111 is in a normally open state to allow the exhaust gas to pass through. When the pulse dust collector 1 back-blows, the baffle 111 falls and the air inlet duct is temporarily closed, which effectively avoids the above situation.

[0022] A wind hood 211 is provided at the end of the air outlet duct of the pulse dust collector 1, a cover plate 212 is provided in the tail gas absorption tank 21, the wind hood 211 is located inside the cover plate 212, and a number of small holes are evenly distributed on the cover plate 212; a swirl plate 213 is provided on the upper part of the tail gas absorption tank 21. The evenly distributed small holes on the cover plate 212 slow down the speed of the chemical tail gas, and on the other hand, the chemical tail gas can be diffused, so that the tail gas can react more fully with the absorption liquid in the tail gas absorption tank, and the swirl plate makes the tail gas rise in a swirl manner.

[0023] The spray absorption pool 22 is connected to the tail gas absorption pool 21, and a plurality of baffles 221 are vertically arranged in the spray absorption pool 22. The baffles 221 form a return gas channel in the spray absorption pool 22. A nozzle 222 is arranged at the top of the spray absorption pool 22, and at least one nozzle 222 is arranged between the baffles 221. The bottom of the spray absorption pool 22 is inclined. The spray absorption pool 23 performs secondary absorption of the tail gas, and the baffles 221 therein increase the path of the tail gas through the spray absorption pool, so that the tail gas stays in the spray absorption pool for a longer time.

[0024] The circulation unit 3 also includes a liquid outlet pipe 32 and a liquid return pipe 33. The liquid outlet pipe 32 is provided with a circulation pump 321. The inlet end of the circulation pump 32 is connected to the tail gas absorption tank 21 and the liquid storage tank 31 respectively. The outlet end of the circulation pump 32 is connected to the nozzle 222, and a valve is arranged on the connecting pipeline. One end of the liquid return pipe 33 is connected to the lowest end of the bottom of the spray absorption tank 22, and the other end is connected to the tail gas adsorption tank 21 and the liquid storage tank 31 respectively through a three-way valve 331. When in use, different absorption liquids can be added to the tail gas absorption tank 21 according to the type of chemical tail gas. According to the tail gas components after being treated by the tail gas absorption tank, the same absorption liquid or different absorption liquids can be added to the liquid storage tank 31, and the use method can be flexible and changeable. For example, if the harmful substances in the exhaust gas are relatively single, the same absorption liquid can be used in the exhaust gas adsorption tank 21 and the liquid storage tank 31; if the exhaust gas still contains other harmful substances after being treated in the exhaust gas absorption tank 21, the treatment liquid can be added to the liquid storage tank 31 in a targeted manner, and pumped to the nozzle 222 through the liquid outlet pipe 32, and then returned to the liquid storage tank 31 through the return liquid pipe 33 and the three-way valve 331.

[0025] The spray adsorption pool 21 is connected to the desulfurization and denitration device 23, and the desulfurization and denitration device 23 is connected to the activated carbon absorption box 24. The activated carbon absorption box 24 is provided with a first activated carbon absorption plate 241 and a second activated carbon absorption plate 242. The first activated carbon absorption plate 241 and the second activated carbon absorption plate 242 are both arc-shaped.

[0026] A first induced draft fan 4 is provided on the pipeline connecting the pulse dust collector 1 and the purification tower 2, and a second induced draft fan 5 is provided at the top outlet of the activated carbon absorption box 24, and the second induced draft fan 5 is connected to an exhaust pipe.

[0027] The first induced draft fan 4 and the second induced draft fan 5 are both corrosion-resistant fans.

[0028] A chemical tail gas purification method, the purification method is: the chemical tail gas first enters a pulse dust collector 1, solid particles and dust are removed by the pulse dust collector 1, and then the tail gas enters a tail gas adsorption tank 21 under the action of a first induced draft fan 4 to absorb harmful substances therein, and then passes through a spray absorption tank 22 for further absorption, the treated tail gas enters a desulfurization and denitrification device 23 for desulfurization and denitrification treatment, and finally the tail gas enters an activated carbon absorption box 24 for absorption and then is discharged.

[0029] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A chemical tail gas purification tower, characterized in that: The invention comprises a pulse dust collector (1) and a purification tower (2), wherein the pulse dust collector (1) is connected to the purification tower (2), and the purification tower (2) is provided with a tail gas absorption tank (21), a spray absorption tank (22), a desulfurization and denitrification device (23) and an activated carbon absorption box (24) in order from bottom to top, wherein the tail gas absorption tank (21) contains tail gas absorption liquid, and the air outlet end of the pulse dust collector (1) is connected to the tail gas absorption liquid through a pipeline, and further comprises a circulation unit (3), wherein the circulation unit (3) comprises a liquid storage tank (31), and the liquid storage tank (31) is respectively connected to the tail gas absorption tank (21) and the spray absorption tank (22) through pipelines.

2. A chemical tail gas purification tower according to claim 1, characterized in that: The air inlet of the pulse dust collector (1) is provided with an anti-backblowing device (11), the anti-backblowing device (11) comprising a windshield (111) arranged on the air inlet duct, the number of the windshield (111) being at least one, and the windshield (111) being rotatably mounted on the air inlet duct via a pin shaft.

3. A chemical tail gas purification tower according to claim 1, characterized in that: An air hood (211) is provided at the end of the air outlet duct of the pulse dust collector (1); a cover plate (212) is provided in the tail gas absorption pool (21); the air hood (211) is located inside the cover plate (212); a plurality of small holes are evenly distributed on the cover plate (212); and a swirl plate (213) is provided on the upper part of the tail gas absorption pool (21).

4. A chemical tail gas purification tower according to claim 1, characterized in that: The spray absorption pool (22) is connected to the tail gas absorption pool (21), a plurality of baffles (221) are vertically arranged in the spray absorption pool (22), the baffles (221) form a return gas channel in the spray absorption pool (22), a nozzle (222) is arranged at the top of the spray absorption pool (22), at least one nozzle (222) is arranged between the baffles (221), and the bottom of the spray absorption pool (22) is arranged obliquely.

5. A chemical tail gas purification tower according to claim 4, characterized in that: The circulation unit (3) further comprises a liquid outlet pipe (32) and a liquid return pipe (33); a circulation pump (321) is provided on the liquid outlet pipe (32); an inlet end of the circulation pump (32) is connected to the tail gas absorption pool (21) and the liquid storage tank (31) respectively; an outlet end of the circulation pump (32) is connected to the spray head (222), and a valve is provided on the connecting pipe; one end of the liquid return pipe (33) is connected to the lowest end of the bottom of the spray absorption pool (22), and the other end is connected to the tail gas adsorption pool (21) and the liquid storage tank (31) respectively through a three-way valve (331).

6. A chemical tail gas purification tower according to claim 1, characterized in that: The spray adsorption pool (21) is connected to a desulfurization and denitration device (23), and the desulfurization and denitration device (23) is connected to an activated carbon absorption box (24). A first activated carbon absorption plate (241) and a second activated carbon absorption plate (242) are provided in the activated carbon absorption box (24), and the first activated carbon absorption plate (241) and the second activated carbon absorption plate (242) are both arc-shaped.

7. A chemical tail gas purification tower according to claim 1, characterized in that: A first induced draft fan (4) is provided on the pipeline connecting the pulse dust collector (1) and the purification tower (2), and a second induced draft fan (5) is provided at the top outlet of the activated carbon absorption box (24), and the second induced draft fan (5) is connected to an exhaust pipe.

8. A chemical tail gas purification tower according to claim 1, characterized in that: The first induced draft fan (4) and the second induced draft fan (5) are both corrosion-resistant fans.

9. A method for purifying chemical tail gas, implemented based on a chemical tail gas purification tower according to any one of claims 1 to 8, characterized in that: The purification method is as follows: the chemical tail gas first enters a pulse dust collector (1), solid particles and dust are removed by the pulse dust collector (1), and then the tail gas enters a tail gas adsorption pool (21) under the action of a first induced draft fan (4) to absorb harmful substances therein, and then passes through a spray absorption pool (22) for further absorption, and the treated tail gas enters a desulfurization and denitrification device (23) for desulfurization and denitrification treatment, and finally the tail gas enters an activated carbon absorption box (24) for absorption and then is discharged.

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