CN210495878U - Urea process tail gas treatment device - Google Patents
Urea process tail gas treatment device Download PDFInfo
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- CN210495878U CN210495878U CN201920840523.5U CN201920840523U CN210495878U CN 210495878 U CN210495878 U CN 210495878U CN 201920840523 U CN201920840523 U CN 201920840523U CN 210495878 U CN210495878 U CN 210495878U
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Abstract
The tail gas treatment device for the urea process comprises a low-pressure absorption tower, a normal-pressure absorption tower, a tail gas pickling tower, a low-pressure absorption tower feeding pump, a normal-pressure absorption tower circulating pump, a tail gas pickling tower upper circulating pump, a tail gas pickling tower lower circulating pump, an ammonia water storage tank and other equipment which are orderly connected through a process pipeline to form the tail gas treatment device. Adopt the utility model provides a urea technology tail gas processing apparatus is very necessary, and its process flow is simple, and the operation is maintained conveniently, and the safety ring protects the coefficient height, and tail gas treatment is effectual, can be with the ammonia processing in the technology tail gas of all kinds of urea devices clean for tail gas discharge to reach standard, the environmental protection practices thrift manufacturing cost, can also avoid because technology tail gas discharge can not reach the environmental protection requirement and be punished the bad phenomenon of being forced to stop production even.
Description
Technical Field
The utility model relates to a coal chemical industry urea field relates to urea production environmental protection problem, specifically is a urea technology tail gas processing apparatus.
Background
In the chemical industry, urea is produced mainly by a carbon dioxide stripping method, an ammonia stripping method and an aqueous solution full-circulation method, and particularly the carbon dioxide stripping method is more. In the process of producing urea, a medium-pressure system, a low-pressure system, normal-pressure flash evaporation, primary evaporation and secondary evaporation in a main device generate process tail gas, and the process tail gas contains a certain amount of NH3 and cannot be directly discharged. At present, the urea device adopts a low-pressure absorption tower and an atmospheric absorption tower to respectively wash and absorb the process tail gas and then discharge the process tail gas into the atmosphere. However, the tail gas discharged from the low-pressure absorption tower and the normal-pressure absorption tower still contains a small amount of NH3, the emission amount of ammonia is up to 8000mg/Nm3, and for a urea device producing 50 ten thousand tons of urea annually, the annual ammonia discharge amount reaches about 40 tons, which not only causes serious pollution to the environment, but also increases the production cost of urea.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a urea technology tail gas processing apparatus can wash the ammonia in the urea technology tail gas totally, can also guarantee that ammonia content in the tail gas satisfies the environmental protection requirement, and discharge to reach standard protects the environment, practices thrift manufacturing cost.
The technical proposal adopted by the utility model is that a urea process tail gas treatment device comprises a low-pressure absorption tower, a normal-pressure absorption tower and a tail gas pickling tower;
the upper end of the low-pressure absorption tower and the upper end of the normal-pressure absorption tower are respectively connected with the lower end of the tail gas pickling tower;
the upper end of the low-pressure absorption tower is filled with a first upper filtering material, the middle end of the low-pressure absorption tower is filled with a first middle filtering material, the upper surface of the first upper filtering material is provided with a first steam condensate sprayer, and the surface of the first middle filtering material is provided with a first reflux condensate sprayer;
the upper end of the normal pressure absorption tower is filled with a second upper filtering material, the middle end of the normal pressure absorption tower is filled with a second middle filtering material, the upper surface of the second upper filtering material is provided with a second steam condensate sprayer, and the surface of the second middle filtering material is provided with a second reflux condensate sprayer;
the upper end of the tail gas pickling tower is filled with a third upper filtering material, the middle end of the tail gas pickling tower is filled with a third filtering material, the upper surface of the third upper filtering material is provided with a third steam condensate sprayer, the surface of the third middle filtering material is provided with a 98% concentrated sulfuric acid replenishing sprayer, and a liquid receiving part is arranged between the third upper filtering material and the 98% concentrated sulfuric acid replenishing sprayer;
the ammonia water storage tank is connected with the first reflux condensate sprayer through a feeding pump of the low-pressure absorption tower, the lower end of the low-pressure absorption tower is connected with the second reflux condensate sprayer through a pipeline, and the lower end of the normal-pressure absorption tower is communicated with the ammonia water storage tank.
And furthermore, the lower end of the normal pressure absorption tower is connected with a second reflux condensate sprayer through a circulating pump of the normal pressure absorption tower.
Further, the tail part of the tail gas pickling tower is connected with a 98% concentrated sulfuric acid supply nozzle through a circulating pump at the lower part of the tail gas pickling tower.
The liquid bearing component comprises an annular liquid receiving ring arranged on the inner wall of the tail gas pickling tower, an umbrella-shaped cover plate is arranged in the middle of the annular liquid receiving ring, the edge of the umbrella-shaped cover plate is spaced from the inner wall of the tail gas pickling tower, and the edge of the umbrella-shaped cover plate is arranged right above the annular liquid receiving ring.
Compared with the above background art, the utility model can have following beneficial effect:
the tail gas treatment device for the urea process adopts the device, the tail gas discharged from the low-pressure absorption tower and the normal-pressure absorption tower is subjected to deep acid washing by the tail gas acid washing tower and the auxiliary equipment facilities thereof, the ammonia in the tail gas is almost completely absorbed by utilizing the characteristic that the ammonia reacts with sulfuric acid to generate ammonium sulfate, and the generated ammonium sulfate solution is sent to other working sections to generate a finished product. The utility model provides a problem that urea device technology tail gas ammonia content exceeds standard and discharges in the chemical industry, avoided because the ammonia content that discharges in the tail gas exceeds standard, lead to not reaching the environmental protection requirement, cause pollution, increase adverse consequences such as urea manufacturing cost to the environment.
Therefore, adopt the utility model provides a urea technology tail gas processing apparatus is very necessary, and its safe environmental protection coefficient is high, and tail gas treatment is effectual, and process flow is simple, and the operation is maintained conveniently, energy saving and consumption reduction, changing waste into valuables. Most importantly, the method can effectively ensure that the tail gas of the urea process reaches the standard and is discharged, and the adverse phenomenon that the tail gas of the process is penalized and even forced to stop production because the tail gas discharge of the process cannot meet the environmental protection requirement is avoided.
Drawings
The invention will be further explained with reference to the drawings:
fig. 1 is a schematic diagram of the present invention.
In the figure: the system comprises a low-pressure absorption tower C1, an atmospheric absorption tower C2, a tail gas pickling tower C3, an atmospheric absorption tower feed cooler E1, an atmospheric absorption tower circulating pump P1, a low-pressure absorption tower feed pump P2, a tail gas pickling tower lower circulating pump P3, a tail gas pickling tower upper circulating pump P4 and an ammonia water storage tank V.
Detailed Description
As shown in the attached figure 1, a urea process tail gas treatment device comprises a low-pressure absorption tower C1, an atmospheric absorption tower C2 and a tail gas pickling tower C3;
the upper end of the low-pressure absorption tower C1 and the upper end of the normal-pressure absorption tower C2 are respectively connected with the lower end of the tail gas pickling tower C3;
the upper end of the low-pressure absorption tower C1 is filled with a first upper filtering material, the middle end of the low-pressure absorption tower C1 is filled with a first middle filtering material, the upper surface of the first upper filtering material is provided with a first steam condensate spray head, and the surface of the first middle filtering material is provided with a first reflux condensate spray head;
the upper end of the normal pressure absorption tower C2 is filled with a second upper filtering material, the middle end of the normal pressure absorption tower C2 is filled with a second middle filtering material, the upper surface of the second upper filtering material is provided with a second steam condensate spray head, the surface of the second middle filtering material is provided with a second reflux condensate spray head, preferably, the lower end of the normal pressure absorption tower C2 is connected with the second reflux condensate spray head through a normal pressure absorption tower circulating pump P1, and a condensation device is arranged in the second reflux condensate spray head and can cool liquid discharged by the normal pressure absorption tower C2;
the upper end of a tail gas pickling tower C3 is filled with a third upper filtering material, the middle end of the tail gas pickling tower C3 is filled with a third filtering material, the upper surface of the third upper filtering material is provided with a third steam condensate sprayer, the surface of the third middle filtering material is provided with a 98% concentrated sulfuric acid supply sprayer, a liquid bearing part is arranged between the third upper filtering material and the 98% concentrated sulfuric acid supply sprayer, and preferably, the tail part of a tail gas pickling tower C3 is connected with the 98% concentrated sulfuric acid supply sprayer through a lower circulating pump P3 of the tail gas pickling tower;
the ammonia water storage tank V is connected with the first reflux condensate sprayer through a low-pressure absorption tower feed pump P2, the lower end of the low-pressure absorption tower C1 is connected with the second reflux condensate sprayer through a pipeline, and the lower end of the normal-pressure absorption tower C2 is communicated with the ammonia water storage tank V.
Preferably, liquid receiving component is including establishing the annular liquid ring of receiving at tail gas pickling tower C3 inner wall be equipped with the umbrella-type apron in the middle of the annular liquid ring of receiving, umbrella-type apron edge with tail gas pickling tower C3 inner wall has the interval, and umbrella-type apron edge is in directly over the annular liquid ring of receiving, third steam condensate shower nozzle spun liquid falls on the umbrella-type apron to it falls into in the liquid ring through its edge to follow umbrella-type apron, thereby prevents that liquid from passing liquid receiving component gets into the third filter material, and the liquid receiving component is passed through the interval of umbrella-type apron with tail gas pickling tower C3 inner wall behind the annular liquid ring of receiving, and the annular liquid ring of receiving is connected with third steam condensate shower nozzle through tail gas pickling tower upper portion circulating pump P4.
The working principle is as follows: the process tail gas from a medium-pressure system and a low-pressure system is connected to the bottom of a low-pressure absorption tower C1, ammonia water in an ammonia water storage tank V is sent to the lower section of the low-pressure absorption tower for washing through a low-pressure absorption tower feeding pump P2, the temperature of an absorption liquid is guaranteed by using a low-pressure absorption tower feeding cooler at the outlet of a pump P2, condensate sprayed out by a first steam condensate sprayer is used at the upper end of the low-pressure absorption tower C1 for secondary washing and absorption, a gas phase outlet is connected to the bottom of a tail gas pickling tower C3, and a liquid phase outlet is cooled through a normal-pressure absorption tower feeding cooler and then enters a normal-.
The normal pressure process gas, the first-stage evaporation process gas and the second-stage evaporation process gas from the normal pressure flash evaporation and evaporation system are connected to the bottom of a normal pressure absorption tower C2, the lower section of the normal pressure absorption tower C2 is circularly washed and absorbed by a normal pressure absorption tower circulating pump P1 and a normal pressure absorption tower cooler, the upper end of the normal pressure absorption tower C2 is secondarily washed and absorbed by condensate sprayed by a second steam condensate sprayer, a gas phase outlet is connected to the bottom of a tail gas acid washing tower C3, and a liquid phase outlet is discharged into an ammonia water storage tank V.
The lower extreme of tail gas pickling tower C3 utilizes tail gas pickling tower lower part circulating pump P3 to carry out circulation washing to the tail gas that comes from low pressure absorption tower C1 and ordinary pressure absorption tower C2, the absorption liquid is the ammonium sulfate solution of certain concentration and certain PH, utilize concentration measurement device and PH score to measure respectively and feed back the regulation ammonium sulfate solution and send outward, mend the flow of 98% concentrated sulfuric acid and steam condensate, guarantee lower part washing absorption effect, tail gas pickling tower C3's upper end utilizes tail gas pickling tower upper portion circulating pump P4 to carry out circulation washing, mend the steam condensate of certain flow, guarantee upper portion washing absorption effect.
In the operation process of the urea device, process tail gas from a medium-pressure system, a low-pressure system, a normal-pressure flash evaporation system, an evaporation system and the like respectively enters a low-pressure absorption tower and a normal-pressure absorption tower to wash and absorb ammonia in the tail gas. And the tail gases from the low-pressure absorption tower and the normal-pressure absorption tower enter a tail gas pickling tower together for deep pickling, so that the ammonia content in the tail gases is reduced to the minimum. Thus, the emission reaching the standard can be realized.
Claims (4)
1. A urea technology tail gas processing apparatus which characterized in that: the urea process tail gas treatment device comprises a low-pressure absorption tower (C1), an atmospheric absorption tower (C2) and a tail gas pickling tower (C3);
the upper end of the low-pressure absorption tower (C1) and the upper end of the normal-pressure absorption tower (C2) are respectively connected with the lower end of the tail gas pickling tower (C3);
the upper end of the low-pressure absorption tower (C1) is filled with a first upper filtering material, the middle end of the low-pressure absorption tower is filled with a first middle filtering material, the upper surface of the first upper filtering material is provided with a first steam condensate spray head, and the surface of the first middle filtering material is provided with a first reflux condensate spray head;
a second upper filtering material is filled at the upper end of the normal pressure absorption tower (C2), a second middle filtering material is filled at the middle end, a second steam condensate spray head is arranged on the upper surface of the second upper filtering material, and a second reflux condensate spray head is arranged on the surface of the second middle filtering material;
the upper end of the tail gas acid washing tower (C3) is filled with a third upper filtering material, the middle end of the tail gas acid washing tower is filled with a third filtering material, the upper surface of the third upper filtering material is provided with a third steam condensate sprayer, the surface of the third filtering material is provided with a 98% concentrated sulfuric acid supply sprayer, and a liquid bearing part is arranged between the third upper filtering material and the 98% concentrated sulfuric acid supply sprayer;
the ammonia water storage tank (V) is connected with the first reflux condensate sprayer through a low-pressure absorption tower feed pump (P2), the lower end of the low-pressure absorption tower (C1) is connected with the second reflux condensate sprayer through a pipeline, and the lower end of the normal-pressure absorption tower (C2) is communicated with the ammonia water storage tank (V).
2. The urea process tail gas treatment device according to claim 1, characterized in that: the lower end of the normal pressure absorption tower (C2) is connected with the second reflux condensate spray head through a normal pressure absorption tower circulating pump (P1).
3. The urea process tail gas treatment device according to claim 1, characterized in that: the tail part of the tail gas acid washing tower (C3) is connected with a 98 percent concentrated sulfuric acid supply spray head through a circulating pump (P3) at the lower part of the tail gas acid washing tower.
4. The urea process tail gas treatment device according to claim 1, characterized in that: the liquid bearing component comprises an annular liquid receiving ring arranged on the inner wall of the tail gas pickling tower (C3), an umbrella-shaped cover plate is arranged in the middle of the annular liquid receiving ring, and the edge of the umbrella-shaped cover plate is spaced from the inner wall of the tail gas pickling tower (C3) and is positioned right above the annular liquid receiving ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920840523.5U CN210495878U (en) | 2019-06-04 | 2019-06-04 | Urea process tail gas treatment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920840523.5U CN210495878U (en) | 2019-06-04 | 2019-06-04 | Urea process tail gas treatment device |
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| CN210495878U true CN210495878U (en) | 2020-05-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111569594A (en) * | 2020-05-22 | 2020-08-25 | 北京北方华创微电子装备有限公司 | Tail gas treatment device and semiconductor equipment |
| CN114912230A (en) * | 2022-03-29 | 2022-08-16 | 青岛科技大学 | Continuous execution path design method, device and process for water-saving clean production technology |
-
2019
- 2019-06-04 CN CN201920840523.5U patent/CN210495878U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111569594A (en) * | 2020-05-22 | 2020-08-25 | 北京北方华创微电子装备有限公司 | Tail gas treatment device and semiconductor equipment |
| CN114912230A (en) * | 2022-03-29 | 2022-08-16 | 青岛科技大学 | Continuous execution path design method, device and process for water-saving clean production technology |
| CN114912230B (en) * | 2022-03-29 | 2024-02-27 | 青岛科技大学 | Continuous execution path design method, device and process for water-saving clean production technology |
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