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Ammonia nitrogen processing method in processing of waste gas of chemical fertilizer plant

A treatment method and technology of a fertilizer factory, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of high cost and high consumption, and achieve the effect of avoiding secondary pollution and promoting decomposition

Inactive Publication Date: 2014-01-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of impurity in the products obtained in the prior art when treating ammonia nitrogen in waste gas, and the problem that the removal of nitrogen and the risk of secondary pollution are not completely solved in essence, the present invention provides a method for treating ammonia nitrogen in waste gas of chemical fertilizer plants, using phosphoric acid as The absorbent can be recycled in the process of continuous absorption and desorption, and the organic denitrification agent is used to make it more completely desorb the ammonia and quickly reduce it to nitrogen, avoiding secondary pollution to the air and solving the problem of high consumption and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First let the waste gas from the fertilizer plant be absorbed with orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then use a lift pump to circulate the mixed solution continuously and absorb ammonia repeatedly until diammonium hydrogen phosphate is completely generated Pass into the ammonia distillation tower with the pipeline afterward, add the organic denitrification agent that is made up of tolutriazole 45g, polyhexenimine 20g, dibutyl phthalate 35g of 15ppm; Install in the ammonia distillation tower Catalyst; finally, steam is introduced into the ammonia distillation tower, and diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; ammonia gas is reduced to nitrogen under the action of the catalyst, and ammonium dihydrogen phosphate is pumped into the top of the absorption tower with a circulating pump , to reabsorb the ammonia in th...

Embodiment 2

[0028] First let the waste gas from the fertilizer plant be absorbed with orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then use a lift pump to circulate the mixed solution continuously and absorb ammonia repeatedly until diammonium hydrogen phosphate is completely generated Pass into the ammonia distillation tower with pipeline afterward, add the organic denitrification agent that is made up of tolutriazole 50g, polyhexenimine 18g, dibutyl phthalate 32g of 30ppm; Install in the ammonia distillation tower Catalyst; finally, steam is introduced into the ammonia distillation tower, and diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; ammonia gas is reduced to nitrogen under the action of the catalyst, and ammonium dihydrogen phosphate is pumped into the top of the absorption tower with a circulating pump , to reabsorb the ammonia in the pi...

Embodiment 3

[0031] First let the waste gas from the fertilizer plant be absorbed with orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then use a lift pump to circulate the mixed solution continuously and absorb ammonia repeatedly until diammonium hydrogen phosphate is completely generated Pass into the ammonia distillation tower with the pipeline afterward, add the organic denitrification agent that is made up of tolutriazole 40g, polyhexenimine 24g, dibutyl phthalate 36g of 20ppm; Install in the ammonia distillation tower Catalyst; finally, steam is introduced into the ammonia distillation tower, and diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; ammonia gas is reduced to nitrogen under the action of the catalyst, and ammonium dihydrogen phosphate is pumped into the top of the absorption tower with a circulating pump , to reabsorb the ammonia in th...

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Abstract

The invention discloses an ammonia nitrogen processing method in processing of waste gas of a chemical fertilizer plant. The processing method includes first absorbing waste gas in an absorption tower through orthophosphate, then utilizing a lifting pump to absorb ammonia till diammonium hydrogen phosphate is completely produced, introducing the diammonium hydrogen phosphate into an ammonia still provided with Bi-Be-Ga-Gd-Ho-Tm-Os / alpha-SiO2 through a pipeline, adding an organic denitrification agent, and finally introducing stream into the ammonia still to enable ammonium dihydrogen phosphate and ammonia gas to be decomposed. The ammonia gas is reduced into nitrogen gas under the effect of the catalyst, the ammonium dihydrogen phosphate is delivered to the top of the absorption tower through a circulation pump, and then ammonia gas in waste gas in the pipeline is absorbed again. The ammonia nitrogen processing method of waste gas in the chemical fertilizer plant utilizes phosphoric acid as the absorbent which is continuously absorbed and desorbed in recycle mode, utilizes organic denitrification agent and heavy metal catalyst to completely decompose the ammonia gas and quickly convert the ammonia gas into the nitrogen gas, and avoids secondary pollution to air.

Description

technical field [0001] The invention relates to a method for treating ammonia nitrogen in the waste gas of a chemical fertilizer plant, belonging to the field of waste gas treatment. Background technique [0002] Most of the exhaust gas discharged from chemical fertilizer plants is ammonia gas, which has a pungent odor and is harmful to the respiratory system. Excessive gas will lead to excessive ammonia concentration in the blood, which will cause cardiac arrest and respiratory arrest through the reflex action of the trigeminal nerve endings, which is life-threatening. There are also toxic trace organic pollutants, carcinogenic effects, and environmental hormones. [0003] At present, the treatment methods of ammonia nitrogen in exhaust gas generally adopt absorption method and catalytic combustion method. The absorption method uses water or dilute sulfuric acid to absorb ammonia gas from the waste gas. Although the absorption efficiency is good, the concentration of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/58B01D53/73
CPCY02A50/20
Inventor 雷春生张凤娥麦源珍
Owner CHANGZHOU UNIV