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Method for recycling ammonia gas in industrial waste gas

A technology for industrial waste gas and ammonia gas, applied in separation methods, chemical instruments and methods, preparation/separation of ammonia, etc., can solve problems affecting the normal use of venting equipment, low concentration of dilute ammonia water, high input costs, etc., to reduce air pollution , less water consumption, and lower equipment investment costs

Inactive Publication Date: 2012-11-21
XIAMEN GREEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this absorption method has the following defects: the absorption efficiency is low, and the absorption effect can only reach 30% of the total amount; the absorption tower is limited by the distance and potential difference of the equipment vent pipe, and it is easy to form gas blockage, which affects the normal use of the vent equipment; The cost of equipment investment is high, the water consumption is large, and the concentration of dilute ammonia water obtained is low. High-content ammonia water must be obtained after secondary absorption or rectification; nearly 70% of ammonia gas that cannot be absorbed enters the atmosphere, causing environmental pollution

Method used

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  • Method for recycling ammonia gas in industrial waste gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The technological process schematic diagram of embodiment sees figure 1 , the specific process is as follows:

[0029] 1) Inject absorbent into the absorbent tank 1, and the absorbent can be water.

[0030] 2) The absorbent in the absorption liquid tank 1 is drawn out from the absorbent outlet 11 of the absorption liquid tank through the water pump 2, passes through the refrigeration equipment 3, and then enters the membrane absorption assembly 4 from the absorption liquid inlet 41 of the membrane absorption assembly; The membrane parameters are as follows: the pore diameter of the membrane wall is 0.0001-20 μm, and the membrane can withstand a temperature of 0-60°C; the membrane in the membrane absorption module can be a hollow fiber microporous membrane, etc.; the wind pressure at the inlet of the membrane absorption module can be 35 ~ 40kPa.

[0031] 3) The ammonia-containing industrial waste gas P is blown into the membrane absorption module 4 through the induced ...

Embodiment 2

[0039] Press the process step 1)~8) of embodiment 1 to operate, and control parameter is as follows: step 2) refrigerating equipment 3 keeps the absorbing liquid temperature at 5 ℃, and the air pressure of the membrane absorption module 4 inlet end in step 3) is 40kPa, obtains ammoniacal liquor The density is 0.901g / cm 3 , equivalent to 27.93% ammonia concentration, see Table 1.

Embodiment 3

[0041] Press the process step 1)~8) of embodiment 1 to operate, and control parameter is as follows:: step 2) refrigerating equipment 3 keeps the absorbing liquid temperature at 5 ℃, and the air pressure of the membrane absorption module 4 in the step 3) is 40kPa, obtains The density of ammonia water is 0.910g / cm 3 , equivalent to 24.98% ammonia concentration, see Table 1.

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Abstract

The invention discloses a method for recycling ammonia gas in industrial waste gas, which relates to treatment of industrial waste gas. A recycling device is provided with an absorption liquid tank, a water pump, refrigeration equipment, a film absorption component, a draft fan and a tail gas absorption acid pool. The method comprises the following steps of: injecting an absorption agent into theabsorption liquid tank; leading the absorption agent in the absorption liquid tank out through the water pump and making the absorption agent pass through the refrigeration equipment and enter the film absorption component from an absorption liquid inlet of the film absorption component; introducing ammonia-containing industrial waste gas into the film absorption component through the draft fan; making the absorption agent change into absorption liquid by absorbing ammonia in the ammonia-containing industrial waste gas and making the absorption liquid flow back to the absorption liquid tank through absorption liquid outlet of the film absorption component and reenter an absorption liquid recycling process; transforming the ammonia-containing industrial waste gas into ultralow-ammonia-content waste gas through absorption, exhausting the ultralow-ammonia-content waste gas from the under part of the film absorption component and introducing the exhausted ultralow-ammonia-content waste gas into the tail gas absorption acid pool; transforming the ultralow-ammonia-content waste gas into ammonia-free waste gas by making the ultralow-ammonia-content waste gas pass through the absorption acid pool directly exhausting the ammonia-free waste gas; circularly absorbing the absorption liquid and leading out a finished product; and re-injecting the absorption agent into the absorption liquidtank, and repeating the steps above.

Description

technical field [0001] The invention relates to a treatment of industrial waste gas, in particular to a method for recycling ammonia in industrial waste gas. Background technique [0002] In the production process of using liquid ammonia in the chemical industry, due to the volatility of ammonia, a large amount of gaseous ammonia is discharged into the air through the equipment vent pipe, which not only causes serious air pollution, but also causes waste of raw materials. In order to solve this problem, the absorption mode of single-circulation water spray is usually adopted for recovery ([1] Shu Shiping, Waste ammonia gas (water) recovery and development and application of refining technology, Chemical Design, 2001, 11: 34- 35; [2] Du Wen, Research on Treatment and Recycling Technology of Ammonia Tail Gas in Tungsten Metallurgical Process, China Tungsten Industry, 2008, 6: 43-46). However, this absorption method has the following defects: the absorption efficiency is low, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18C01C1/12
Inventor 陈瑞坚陈崇勇王海涛
Owner XIAMEN GREEN SCI & TECH