Fluorine chemical silicon tetrafluoride pollutant waste gas recovery and treatment device

Abstract

The utility model discloses a fluorine chemical industry silicon tetrafluoride pollutant waste gas recovery and treatment device which comprises a water washing recovery tower, an alkali washing reaction tower, a biological deodorization filter tank, a centrifugal fan, a first integrated circulating water tank, a second integrated circulating water tank and a third integrated circulating water tank. According to the utility model, the fluorine chemical waste gas emission meets the requirements of Technical Specification for Treatment and Disposal of Fluorine-Containing Waste Gas GB / T33056-2016 and Zhejiang Province that the odor concentration of industrial and mining enterprises is organized to be not more than 1000 (dimensionless), meanwhile, the recycling of silicon tetrafluoride resources is realized, and the technology of the utility model is worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of resource recovery and purification treatment of fluorochemical waste gas, and particularly relates to the resource recovery and treatment of silicon tetrafluoride-containing waste gas generated in a new energy industrial workshop of lithium hexafluorophosphate. Background Technique

[0002] With the implementation of the Technical Specification for the Treatment and Disposal of Fluorine-containing Waste Gas GB / T33056-2016 and the requirement in Zhejiang Province that the organized emission of odor concentration in industrial and mining enterprises shall not be greater than 1000 (dimensionless), while the previous standard required that the organized emission of odor concentration at the exhaust port should not be greater than 2000 (dimensionless). The treatment effects of the original waste gas treatment facilities and processes can no longer meet the requirements of the new emission standards. Especially for the odor concentration index, it often disturbs the residents and causes complaints. New technologies and processes are needed for waste gas treatment to meet the new requirements. Content of the Utility Model

[0003] The main purpose of the utility model is to propose a device for recycling and treating silicon tetrafluoride pollutant waste gas in fluorochemical industry, aiming to achieve that the fluorochemical waste gas emission meets the Technical Specification for the Treatment and Disposal of Fluorine-containing Waste Gas GB / T33056-2016 and the requirement in Zhejiang Province that the organized emission of odor concentration in industrial and mining enterprises shall not be greater than 1000 (dimensionless), and at the same time realize the resource recovery and utilization of silicon tetrafluoride.

[0004] To achieve the above purpose, the utility model provides a device for recycling and treating silicon tetrafluoride pollutant waste gas in fluorochemical industry, including: a water washing and recycling tower (1), an alkali washing reaction tower (2), a biological deodorization filter tank (3), a centrifugal fan (4), a first integrated circulation water tank (14), a second integrated circulation water tank (24) and a third integrated circulation water tank (31).

[0005] The bottom inside the water washing and recycling tower (1) is communicated with the first integrated circulation water tank (14); the water washing and recycling tower (1) is provided with a first spraying and circulating system, which is composed of a first spraying faucet (12) and a first circulation pump (13) connected by a pipeline; a first packing layer (11) is arranged inside the water washing and recycling tower (1), and the first spraying faucet (12) is arranged above the first packing layer (11); a first demisting layer (15) is arranged at the upper part of the water washing and recycling tower (1); the water washing and recycling tower (1) is provided with a first waste gas inlet (16) and a first air outlet (17).

[0006] The caustic washing reaction tower (2) is provided with a second spray circulation system, which is composed of a second spray head (22) and a second circulation pump (23) connected by a pipeline; a second packing layer (21) is arranged in the caustic washing reaction tower (2), and the second spray head (22) is arranged above the second packing layer (21); a second demisting layer (25) is arranged at the upper part of the caustic washing reaction tower (2); the caustic washing reaction tower (2) is provided with a second waste gas inlet (26) and a second air outlet (27); the bottom inside the caustic washing reaction tower (2) is communicated with the second integrated circulation water tank (24); the caustic washing reaction tower (2) is equipped with a caustic solution dosing device (28), and the caustic solution dosing device (28) is communicated with the second integrated circulation water tank (24) through a dosing metering pump (29) and a pipeline.

[0007] A one-way microbial filter bed (34) and a two-way microbial filter bed (35) are arranged in the biological deodorization filter tank (3); a grid bearing platform (36) is arranged in the biological deodorization filter tank (3); the biological deodorization filter tank (3) is provided with a spray humidification circulation system, which is composed of a third spray head (33) and a biological circulation pump (32) connected by a pipeline; the bottom inside the third integrated circulation water tank (31) and the biological deodorization filter tank (3), and a third waste gas inlet (37) and a third air outlet (38) are arranged in the biological deodorization filter tank (3).

[0008] Among them, the packing of the first packing layer (11) is selected as PP multi-faceted balls, and the stacking height of the packing is 2.4 meters to 3 meters.

[0009] Among them, the packing of the second packing layer (21) is selected as PP multi-faceted balls, and the stacking height of the packing is 2.4 meters to 3 meters.

[0010] Among them, the residence time of the pollutant waste gas in the water washing recovery tower (1) is 10 seconds to 12 seconds. When the concentration of silicon tetrafluoride reaches 15%-20% after water washing absorption, the circulating liquid is recycled.

[0011] Among them, the residence time of the pollutant waste gas in the caustic washing reaction tower (2) is 10 seconds to 12 seconds.

[0012] Among them, the residence time of the pollutant waste gas in the biological deodorization filter tank (3) is 15 seconds to 25 seconds.

[0013] The beneficial effects of the present utility model are as follows: The present utility model realizes that the fluorochemical waste gas emission meets the requirements of the "Technical Specification for Treatment and Disposal of Fluorine-containing Waste Gas" GB / T 33056-2016 and the requirement of Zhejiang Province that the organized emission of odor concentration of industrial and mining enterprises shall not be greater than 1000 (dimensionless). At the same time, the recovery and utilization of silicon tetrafluoride resources are realized, and the technology of the present utility model is worthy of popularization and application. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0015] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the tetrafluorosilane pollutant waste gas recovery and treatment device for fluorochemical industry of the present invention.

[0016] The realization of the purpose, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments with reference to the drawings. Specific Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0018] Please refer to Figure 1 , the present invention provides a tetrafluorosilane pollutant waste gas recovery and treatment device for fluorochemical industry. The preferred embodiment of the tetrafluorosilane pollutant waste gas recovery and treatment device for fluorochemical industry of the present invention includes: a water washing recovery tower (1), an alkali washing reaction tower (2), a biological deodorization filter tank (3), a centrifugal fan (4), a first integrated circulation water tank (14), a second integrated circulation water tank (24), and a third integrated circulation water tank (31).

[0019] Among them, the bottom inside the water washing recovery tower (1) is communicated with the first integrated circulation water tank (14); the water washing recovery tower (1) is provided with a first spray circulation system, which is composed of a first spray head (12) and a first circulation pump (13) connected by a pipeline; a first packing layer (11) is arranged inside the water washing recovery tower (1), and the first spray head (12) is arranged above the first packing layer (11); a first demisting layer (15) is arranged at the upper part of the water washing recovery tower (1); the water washing recovery tower (1) is provided with a first waste gas inlet (16) and a first outlet (17).

[0020] The caustic scrubbing reaction tower (2) is provided with a second spray circulation system, which is composed of a second spray head (22) and a second circulation pump (23) connected by a pipeline; a second packing layer (21) is arranged in the caustic scrubbing reaction tower (2), and the second spray head (22) is arranged above the second packing layer (21); a second demisting layer (25) is arranged at the upper part of the caustic scrubbing reaction tower (2); the caustic scrubbing reaction tower (2) is provided with a second waste gas inlet (26) and a second outlet (27); the bottom inside of the caustic scrubbing reaction tower (2) is communicated with the second integrated circulation water tank (24); the caustic scrubbing reaction tower (2) is equipped with a caustic solution dosing device (28), and the caustic solution dosing device (28) is communicated with the second integrated circulation water tank (24) through a dosing metering pump (29) and a pipeline.

[0021] A one-way microbial filter bed (34) and a two-way microbial filter bed (35) are arranged in the biological deodorization filter tank (3); a grid bearing platform (36) is arranged in the biological deodorization filter tank (3); the biological deodorization filter tank (3) is provided with a spray humidification circulation system, which is composed of a third spray head (33) and a biological circulation pump (32) connected by a pipeline; the bottom inside of the third integrated circulation water tank (31) and the biological deodorization filter tank (3), and a third waste gas inlet (37) and a third outlet (38) are arranged in the biological deodorization filter tank (3).

[0022] In this embodiment, the packing of the first packing layer (11) is selected as PP multi-faceted balls, and the stacking height of the packing is 2.4 meters to 3 meters.

[0023] In this embodiment, the packing of the second packing layer (21) is selected as PP multi-faceted balls, and the stacking height of the packing is 2.4 meters to 3 meters.

[0024] In this embodiment, the residence time of the pollutant waste gas in the water washing recovery tower (1) is 10 seconds to 12 seconds. When the concentration of silicon tetrafluoride reaches 15%-20% after water washing absorption, the circulating liquid is recycled.

[0025] In this embodiment, the residence time of the pollutant waste gas in the caustic scrubbing reaction tower (2) is 10 seconds to 12 seconds.

[0026] In this embodiment, the residence time of the pollutant waste gas in the biological deodorization filter tank (3) is 15 seconds to 25 seconds.

[0027] The following describes the process of recycling and treating silicon tetrafluoride pollutant waste gas in fluorochemical industry by using the present utility model.

[0028] The first step: The biological deodorization filter tank (3) is filled with fluorine-resistant microorganisms to form the fluorine-resistant microbial filter bed (35).

[0029] Step 2: Add a certain amount of circulating water into the first integrated circulating water tank (14) of the water washing and recovery tower (1) and the second integrated circulating water tank (24) of the alkali washing reaction tower (2), and inject alkali solution into the alkali washing reaction tower (2) at a certain ratio;

[0030] Step 3: The fluorine-containing waste gas enters the water washing and recovery tower (1), the alkali washing reaction tower (2) and the biological deodorization filter tank (3) from the waste gas inlet. In the packing layer, the waste gas and the circulating liquid are in full contact, and silicon tetrafluoride in the waste gas is removed by dissolution, acid-base neutralization and microbial decomposition.

[0031] In Step 2, sulfur alkali is added to the alkali washing reaction tower (2) at a certain ratio, and the pH value of the circulating liquid is adjusted to 10 - 11 by adding alkali.

[0032] During the whole process, the recovery rate of silicon tetrafluoride in the waste gas is not less than 98%, and the removal rate of odor concentration is not less than 90%.

[0033] The beneficial effects of the present utility model are as follows: The present utility model realizes that the fluorochemical waste gas emission meets the requirements of the "Technical Specification for Treatment and Disposal of Fluorine-Containing Waste Gas" GB / T 33056-2016 and the requirement of Zhejiang Province that the organized emission of odor concentration of industrial and mining enterprises shall not be greater than 1000 (dimensionless). At the same time, the recovery and utilization of silicon tetrafluoride resources are realized, and the technology of the present utility model is worthy of popularization and application.

[0034] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included in the patent protection scope of the present utility model.

Claims

1. A fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device, characterized in that, Including: A water washing recovery tower (1), an alkali washing reaction tower (2), a biological deodorization filter (3), a centrifugal fan (4), a first integrated circulation water tank (14), a second integrated circulation water tank (24), and a third integrated circulation water tank (31); The bottom inside the water washing recovery tower (1) is communicated with the first integrated circulation water tank (14); the water washing recovery tower (1) is provided with a first spray circulation system, and the first spray circulation system is composed of a first spray head (12) and a first circulation pump (13) connected by a pipeline; a first packing layer (11) is arranged inside the water washing recovery tower (1), and the first spray head (12) is arranged above the first packing layer (11); a first demisting layer (15) is arranged at the upper part of the water washing recovery tower (1); the water washing recovery tower (1) is provided with a first waste gas inlet (16) and a first air outlet (17); The alkali washing reaction tower (2) is provided with a second spray circulation system, and the second spray circulation system is composed of a second spray head (22) and a second circulation pump (23) connected by a pipeline; a second packing layer (21) is arranged inside the alkali washing reaction tower (2), and the second spray head (22) is arranged above the second packing layer (21); a second demisting layer (25) is arranged at the upper part of the alkali washing reaction tower (2); the alkali washing reaction tower (2) is provided with a second waste gas inlet (26) and a second air outlet (27); the bottom inside the alkali washing reaction tower (2) is communicated with the second integrated circulation water tank (24); the alkali washing reaction tower (2) is equipped with an alkali liquid dosing device (28), and the alkali liquid dosing device (28) is communicated with the second integrated circulation water tank (24) through a dosing metering pump (29) and a pipeline; Inside the biological deodorization filter (3), there is a first-pass microbial filter bed (34) and a second-pass microbial filter bed (35); a grid bearing platform (36) is arranged inside the biological deodorization filter (3); the biological deodorization filter (3) is provided with a spray humidification circulation system, and the spray humidification circulation system is composed of a third spray head (33) and a biological circulation pump (32) connected by a pipeline; the bottom inside the third integrated circulation water tank (31) and the biological deodorization filter (3), and a third waste gas inlet (37) and a third air outlet (38) are arranged inside the biological deodorization filter (3); The packing of the first packing layer (11) selects PP multi-faceted balls, and the packing of the second packing layer (21) selects PP multi-faceted balls.

2. The fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device according to claim 1, characterized in that, The stacking height of the packing of the first packing layer (11) is 2.4 meters to 3 meters.

3. The fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device according to claim 1, characterized in that, The stacking height of the packing of the second packing layer (21) is 2.4 meters to 3 meters.

4. The fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device according to claim 1, wherein The residence time of the pollutant waste gas in the water washing recovery tower (1) is 10 seconds to 12 seconds. When the concentration of silicon tetrafluoride reaches 15% - 20% after water washing absorption, the circulating liquid is recycled.

5. The fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device according to claim 1, wherein The residence time of the pollutant waste gas in the alkali washing reaction tower (2) is 10 seconds to 12 seconds.

6. The fluorochemical silicon tetrafluoride pollutant waste gas recovery and treatment device according to claim 1, characterized in that, The residence time of the pollutant waste gas in the biological deodorization filter (3) is 15 seconds to 25 seconds.

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