CN210206374U - Tail gas processing apparatus in lithium hexafluorophosphate production process - Google Patents
Tail gas processing apparatus in lithium hexafluorophosphate production process Download PDFInfo
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- CN210206374U CN210206374U CN201920893193.6U CN201920893193U CN210206374U CN 210206374 U CN210206374 U CN 210206374U CN 201920893193 U CN201920893193 U CN 201920893193U CN 210206374 U CN210206374 U CN 210206374U
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Abstract
The utility model discloses a tail gas treatment device in the production process of lithium hexafluorophosphate, which comprises a secondary water absorption system and an alkali absorption system; the second-stage water absorption system comprises a first-stage water washing tower, a falling film absorber, a first-stage water washing tower kettle, a second-stage water washing tower kettle, a first circulating pump and a second circulating pump; the alkali absorption system comprises a primary alkali washing tower, a primary alkali washing tower circulating pump, a first fan, a second fan, a secondary alkali washing tower circulating pump, a secondary alkali washing tower, a primary alkali washing tower kettle and a secondary alkali washing tower kettle. The utility model relates to a tail gas processing apparatus in lithium hexafluorophosphate production process can absorb a large amount of hydrogen chloride and the hydrogen fluoride gas that produce in the lithium hexafluorophosphate production process and prepare the mixed acid and supply follow-up by-product for the production usefulness to effectively reduce the use amount of follow-up alkali wash in-process alkali absorption liquid.
Description
Technical Field
The utility model relates to a tail gas processing apparatus in lithium hexafluorophosphate production process.
Background
Because there are a large amount of hydrogen chloride and the hydrogen fluoride gas production in the lithium hexafluorophosphate production process, also have very big difficulty to the absorption of these gases, originally be equipped with the tail gas system, but according to the actual use condition discovery current situation's tail gas absorption efficiency is about 95%, wherein has 5% tail gas to pass through the secondary water absorption and get into subsequent alkali absorption department, has caused very big use amount to alkali solution of alkali absorption system, has accompanied more salt-containing sewage simultaneously. In addition, in the water washing process, hydrogen chloride and hydrogen fluoride gases are dissolved in water to release a large amount of heat, so that the temperature of water washing liquid is increased, and the water washing efficiency is greatly influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a tail gas processing apparatus in the lithium hexafluorophosphate production process can absorb a large amount of hydrogen chloride and the hydrogen fluoride gas that produce in the lithium hexafluorophosphate production process and prepare the mixed acid and supply follow-up by-product production usefulness to effectively reduce the use amount of follow-up alkali absorption liquid of washing in-process with alkaline.
In order to realize the purpose, the technical scheme of the utility model is to design a tail gas processing apparatus in the lithium hexafluorophosphate production process, its characterized in that: comprises a secondary water absorption system and an alkali absorption system;
the second-stage water absorption system comprises a first-stage water washing tower, a falling film absorber, a first-stage water washing tower kettle, a second-stage water washing tower kettle, a first circulating pump and a second circulating pump; the falling film absorber is provided with a tail gas inlet and a cooling water inlet and outlet; the upper part and the lower part of the falling film absorber are respectively connected with the lower part of the primary water washing tower and the upper part of the tower kettle of the primary water washing tower through liquid path pipelines; the lower part of the tower kettle of the primary water washing tower is connected with the upper part of the primary water washing tower through a liquid path pipeline, and a first circulating pump is arranged on the liquid path pipeline; the lower part of the falling film absorber is connected with the lower part of the primary washing tower through a gas path pipeline, the upper part of the primary washing tower is connected with the lower part of the secondary washing tower through a gas path pipeline, and the top of the secondary washing tower is provided with a tail gas outlet; the upper part and the lower part of the second-stage washing tower are connected with the lower part and the upper part of a tower kettle of the second-stage washing tower through a liquid path pipeline, and a second circulating pump is arranged on the liquid path pipeline;
the alkali absorption system comprises a primary alkali washing tower, a primary alkali washing tower circulating pump, a first fan, a second fan, a secondary alkali washing tower circulating pump, a secondary alkali washing tower, a primary alkali washing tower kettle and a secondary alkali washing tower kettle; a tail gas inlet is arranged on the tower kettle of the primary alkali washing tower and connected with a tail gas outlet of the secondary water washing tower; the bottom of the first-stage alkaline washing tower is connected with the upper part of a tower kettle of the first-stage alkaline washing tower; the upper part of the primary alkaline washing tower is connected with the lower part of a tower kettle of the primary alkaline washing tower through a liquid path pipeline, and a circulating pump of the primary alkaline washing tower is arranged on the liquid path pipeline; the upper part of the primary alkaline washing tower is connected with a first fan and a second fan in parallel through a gas path pipeline, and the first fan and the second fan are connected with a tail gas inlet of a tower kettle of the secondary alkaline washing tower through the gas path pipeline; the upper part of the tower kettle of the secondary alkaline washing tower is connected with the bottom of the secondary alkaline washing tower, the upper part of the secondary alkaline washing tower is connected with the lower part of the tower kettle of the secondary alkaline washing tower through a liquid path pipeline, and a circulating pump of the secondary alkaline washing tower is arranged on the liquid path pipeline; and a tail gas outlet is formed in the top of the secondary alkaline washing tower.
Further, water washing liquid is stored in the tower kettle of the first-stage water washing tower and the tower kettle of the second-stage water washing tower; and alkaline washing liquid is stored in the tower kettle of the first-stage alkaline washing tower and the tower kettle of the second-stage alkaline washing tower.
Tail gas firstly enters a secondary water absorption system, and the tail gas sequentially passes through a falling film absorber, a primary water washing tower and a secondary water washing tower; and the tail gas enters an alkali absorption system, and the tail gas sequentially passes through a first-stage alkali washing tower kettle, a first-stage alkali washing tower, a first fan, a second-stage alkali washing tower kettle and a second-stage alkali washing tower.
The utility model has the advantages and the beneficial effects that: the utility model relates to a tail gas processing apparatus in lithium hexafluorophosphate production process can absorb a large amount of hydrogen chloride and the hydrogen fluoride gas that produce in the lithium hexafluorophosphate production process and prepare the mixed acid and supply follow-up by-product for the production usefulness to effectively reduce the use amount of follow-up alkali wash in-process alkali absorption liquid.
A falling film absorber is added on a secondary water absorption system, after absorption by the falling film absorber, the temperature of absorption liquid is effectively controlled, the washing efficiency is obviously increased, and the tail gas absorption efficiency of the device reaches more than 99%. The water absorption proportion is greatly increased, and the alkali liquor consumption and the sewage quantity are reduced by about 80 percent.
The fan induced drafts to the tail gas system, is favorable to the emission of tail gas, avoids equipment to have the production of superpressure phenomenon simultaneously, and the tradition adopts the mode of fan series connection to inhale to the tail gas system and can produce the unstable phenomenon of wind pressure. The utility model discloses well adoption fan is parallelly connected, under the condition of starting two fans simultaneously, because of breathing in to same part simultaneously, the wind pressure can be balanced, so does not have the unstable condition of wind pressure to appear.
Drawings
Fig. 1 is a schematic view of the second-stage water absorption system of the present invention.
Fig. 2 is a schematic diagram of the alkali absorption system of the present invention.
Wherein, the first order water scrubber 1, falling liquid film absorber 2, first order water scrubber tower cauldron 3, second grade water scrubber 4, second grade water scrubber tower cauldron 5, first circulating pump 6, second circulating pump 7, first order alkaline washing tower 8, first order alkaline washing tower circulating pump 9, first fan 10, second fan 11, second order alkaline washing tower circulating pump 12, second order alkaline washing tower 13, first order alkaline washing tower cauldron 14, second order alkaline washing tower cauldron 15, tail gas flow direction A, cooling water flow direction B, washing liquid/alkaline washing liquid flow direction C.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example (b):
a tail gas treatment device in the production process of lithium hexafluorophosphate comprises a secondary water absorption system and an alkali absorption system;
the secondary water absorption system comprises a primary water washing tower 1, a falling film absorber 2, a primary water washing tower kettle 3, a secondary water washing tower 4, a secondary water washing tower kettle 5, a first circulating pump 6 and a second circulating pump 7; the falling film absorber 2 is provided with a tail gas inlet and a cooling water inlet and outlet; the upper part and the lower part of the falling film absorber 2 are respectively connected with the lower part of the primary water washing tower 1 and the upper part of the tower kettle 3 of the primary water washing tower through liquid path pipelines; the lower part of the tower kettle 3 of the primary water washing tower is connected with the upper part of the primary water washing tower 1 through a liquid path pipeline, and a first circulating pump 6 is arranged on the liquid path pipeline; the lower part of the falling film absorber 2 is connected with the lower part of the primary water washing tower 1 through a gas path pipeline, the upper part of the primary water washing tower 1 is connected with the lower part of the secondary water washing tower 4 through a gas path pipeline, and the top of the secondary water washing tower 4 is provided with a tail gas outlet; the upper part and the lower part of the second-stage water washing tower 4 are connected with the lower part and the upper part of a tower kettle 5 of the second-stage water washing tower through a liquid pipeline, and a second circulating pump 7 is arranged on the liquid pipeline;
the alkali absorption system comprises a primary alkali washing tower 8, a primary alkali washing tower circulating pump 9, a first fan 10, a second fan 11, a secondary alkali washing tower circulating pump 12, a secondary alkali washing tower 13, a primary alkali washing tower kettle 14 and a secondary alkali washing tower kettle 15; a tail gas inlet is arranged on the tower kettle 14 of the primary alkali washing tower and is connected with a tail gas outlet of the secondary water washing tower 4; the bottom of the primary alkaline washing tower 8 is connected with the upper part of a tower kettle 14 of the primary alkaline washing tower; the upper part of the primary alkaline washing tower 8 is connected with the lower part of a tower kettle 14 of the primary alkaline washing tower through a liquid path pipeline, and a circulating pump 9 of the primary alkaline washing tower is arranged on the liquid path pipeline; the upper part of the primary alkaline washing tower 8 is connected with a first fan 10 and a second fan 11 in parallel through a gas pipeline, and the first fan 10 and the second fan 11 are connected with a tail gas inlet of a tower kettle 15 of the secondary alkaline washing tower through a gas pipeline; the upper part of the tower kettle 15 of the secondary alkaline washing tower is connected with the bottom of the secondary alkaline washing tower 13, the upper part of the secondary alkaline washing tower 13 is connected with the lower part of the tower kettle 15 of the secondary alkaline washing tower through a liquid path pipeline, and a circulating pump 12 of the secondary alkaline washing tower is arranged on the liquid path pipeline; and a tail gas outlet is formed in the top of the secondary alkaline washing tower 13.
The washing liquid is stored in the tower kettle 3 of the first-stage washing tower and the tower kettle 5 of the second-stage washing tower; and alkaline washing liquid is stored in the first-stage alkaline washing tower kettle 14 and the second-stage alkaline washing tower kettle 15.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The utility model provides a tail gas processing apparatus in lithium hexafluorophosphate production process which characterized in that: comprises a secondary water absorption system and an alkali absorption system;
the second-stage water absorption system comprises a first-stage water washing tower, a falling film absorber, a first-stage water washing tower kettle, a second-stage water washing tower kettle, a first circulating pump and a second circulating pump; the falling film absorber is provided with a tail gas inlet and a cooling water inlet and outlet; the upper part and the lower part of the falling film absorber are respectively connected with the lower part of the primary water washing tower and the upper part of the tower kettle of the primary water washing tower through liquid path pipelines; the lower part of the tower kettle of the primary water washing tower is connected with the upper part of the primary water washing tower through a liquid path pipeline, and a first circulating pump is arranged on the liquid path pipeline; the lower part of the falling film absorber is connected with the lower part of the primary washing tower through a gas path pipeline, the upper part of the primary washing tower is connected with the lower part of the secondary washing tower through a gas path pipeline, and the top of the secondary washing tower is provided with a tail gas outlet; the upper part and the lower part of the second-stage washing tower are connected with the lower part and the upper part of a tower kettle of the second-stage washing tower through a liquid path pipeline, and a second circulating pump is arranged on the liquid path pipeline;
the alkali absorption system comprises a primary alkali washing tower, a primary alkali washing tower circulating pump, a first fan, a second fan, a secondary alkali washing tower circulating pump, a secondary alkali washing tower, a primary alkali washing tower kettle and a secondary alkali washing tower kettle; a tail gas inlet is arranged on the tower kettle of the primary alkali washing tower and connected with a tail gas outlet of the secondary water washing tower; the bottom of the first-stage alkaline washing tower is connected with the upper part of a tower kettle of the first-stage alkaline washing tower; the upper part of the primary alkaline washing tower is connected with the lower part of a tower kettle of the primary alkaline washing tower through a liquid path pipeline, and a circulating pump of the primary alkaline washing tower is arranged on the liquid path pipeline; the upper part of the primary alkaline washing tower is connected with a first fan and a second fan in parallel through a gas path pipeline, and the first fan and the second fan are connected with a tail gas inlet of a tower kettle of the secondary alkaline washing tower through the gas path pipeline; the upper part of the tower kettle of the secondary alkaline washing tower is connected with the bottom of the secondary alkaline washing tower, the upper part of the secondary alkaline washing tower is connected with the lower part of the tower kettle of the secondary alkaline washing tower through a liquid path pipeline, and a circulating pump of the secondary alkaline washing tower is arranged on the liquid path pipeline; and a tail gas outlet is formed in the top of the secondary alkaline washing tower.
2. The device for treating tail gas generated in the production process of lithium hexafluorophosphate according to claim 1, wherein the device comprises: the first-stage washing tower kettle and the second-stage washing tower kettle are used for storing washing liquid; and alkaline washing liquid is stored in the tower kettle of the first-stage alkaline washing tower and the tower kettle of the second-stage alkaline washing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920893193.6U CN210206374U (en) | 2019-06-14 | 2019-06-14 | Tail gas processing apparatus in lithium hexafluorophosphate production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920893193.6U CN210206374U (en) | 2019-06-14 | 2019-06-14 | Tail gas processing apparatus in lithium hexafluorophosphate production process |
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| CN210206374U true CN210206374U (en) | 2020-03-31 |
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| CN201920893193.6U Active CN210206374U (en) | 2019-06-14 | 2019-06-14 | Tail gas processing apparatus in lithium hexafluorophosphate production process |
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