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Evaporation and deamination based deep recovery system and recovery method for achieving near-zero ammonia discharge

A near-zero emission and recovery system technology, applied in ammonia preparation/separation, etc., can solve problems such as air pollution and reduce product yield, achieve the effect of small investment, improve environmental quality, and be suitable for popularization and application

Active Publication Date: 2016-12-14
南京高捷轻工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the usual practice is to directly connect the vacuum pump to the evaporative condenser or absorption tower to evacuate, resulting in ammonia gas contained in the non-condensable gas, which not only reduces the product yield, but also causes air pollution

Method used

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  • Evaporation and deamination based deep recovery system and recovery method for achieving near-zero ammonia discharge
  • Evaporation and deamination based deep recovery system and recovery method for achieving near-zero ammonia discharge

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0038] Embodiment 1. The tail gas ammonia recovery of the four-effect evaporative condenser of the lysine-containing ammonia ion exchange liquid

[0039] The L-lysine clutch liquid contains ammonia, which exists in the form of ammonia water. In the prior art, the concentrated ammonia and condensed water are recovered together after the evaporation condenser is cooled, but there is still a small amount of non-condensable gas discharged from the condenser. Gaseous ammonia and condensable gases (water vapour). Further recovery is performed using the deep recovery system of the present invention.

[0040] Liquid volume 37.5m 3 / h, the lysine content in the feed is 2-25% (w / v), the ammonia content is 0.8-1.2% (w / v), the material is concentrated by four-effect evaporation, and the material enters from the four-effect flash evaporation, and the flash evaporation The higher concentration of ammonia and water evaporated (total 6.25m 3 / h, which contains 0.22t / h of ammonia, 6.03t / h o...

Embodiment 2

[0045] Embodiment 2. Ammonia recovery by evaporation of ammonia-containing wastewater

[0046] A kind of chemical waste water, the water volume is 12t / h, the salt content is 2.5%, and the ammonia content is 2000ppm. The evaporation process is MVR plate evaporation and concentration, concentrated to 28% salt, evaporation capacity 10.93t / h, evaporation temperature 80°C.

[0047] During the evaporation process, all the ammonia is volatilized with the water, and the condensed water containing ammonia is obtained through the condenser, 10.93t / h. The non-condensable gas coming out of the condenser contains condensable and pungent ammonia odor.

[0048] After this part of gas is recovered by two-stage jet extraction, mixed absorption, and recondensation of the present invention, the non-condensable gas coming out of the vacuum pump has no smell of ammonia.

[0049] The basic process parameters are as follows:

[0050] Suction pressure: 15kpa; air extraction rate: 25kg / h; steam wor...

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Abstract

The invention relates to the technical field of ammonia gas recovery, in particular to an evaporation and deamination based deep recovery system and recovery method for achieving near-zero ammonia discharge. The recovery method comprises the following steps that 1, steam vacuum ejection, suction and mixing are conducted on ammonia-containing non-condensable gas through a primary steam ejector to make most of ammonia in the ammonia-containing non-condensable gas fully absorbed by water vapor; 2, steam vacuum ejection, suction and mixing are conducted on the non-condensable gas subjected to the treatment in the step 1 and containing a little amount of ammonia through a secondary steam ejector to make the ammonia in the non-condensable gas containing a little amount of ammonia fully absorbed by water vapor; 3, suction is conducted on the non-condensable gas discharged after treatment in the step 2 and containing a slight trace amount of ammonia to achieve near-zero ammonia discharge. The investment added for the recovery system is low, the yield of an ammonia product is high, meanwhile the near-zero ammonia discharge is achieved, and the environmental quality is greatly improved.

Description

technical field [0001] The invention relates to the technical field of ammonia gas recovery, in particular to a recovery system and method capable of completely recovering ammonia from evaporative deamination tail gas and generating a high vacuum. At the same time, it is a method of absorbing ammonia in non-condensable gas by using injected steam. Background technique [0002] In the process of chemical product production or evaporation and crystallization of chemical wastewater, because the material or wastewater contains ammonia, it exists in the form of ammonia water. Due to the needs of the production process or the limitation of the wastewater discharge standard, it is necessary to remove the ammonia. [0003] Commonly used methods for removing ammonia include deammonization towers, evaporation and concentration, etc., and these methods are usually operated under negative pressure. After ammonia is separated from the liquid, it needs to be absorbed and cooled by water...

Claims

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Application Information

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IPC IPC(8): C01C1/12
CPCC01C1/12
Inventor 姚岷民邓远德
Owner 南京高捷轻工设备有限公司