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

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

Inactive Publication Date: 2012-11-14
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 fertil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, let the waste gas of the fertilizer plant be absorbed by orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then the mixed solution is continuously circulated by a lift pump, and ammonia gas is repeatedly absorbed until diammonium hydrogen phosphate is completely generated Then pass into the ammonia distillation tower with a pipeline, and add 15ppm of the organic denitrification agent composed of 45g of methyl benzotriazole, 20g of polyhexene imine, and 35g of dibutyl phthalate; install in the ammonia distillation tower Finally, steam is introduced into the ammonia distillation tower, and the diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; the ammonia gas is reduced to nitrogen under the action of the catalyst, and the diammonium hydrogen phosphate is pumped into the top of the absorption tower with a circulating pump , reabsor...

Embodiment 2

[0028] First, let the waste gas of the fertilizer plant be absorbed by orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then the mixed solution is continuously circulated by a lift pump, and ammonia gas is repeatedly absorbed until diammonium hydrogen phosphate is completely generated Then pass into the ammonia distillation tower with a pipeline, and add 30ppm of organic denitrification agent composed of 50 g of methylbenzotriazole, 18 g of polyhexene imine, and 32 g of dibutyl phthalate; install in the ammonia distillation tower Catalyst; finally, steam is introduced into the ammonia distillation tower, and the diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; the ammonia gas is reduced to nitrogen under the action of the catalyst, and the diammonium hydrogen phosphate is pumped into the top of the absorption tower with a circulating pump ,...

Embodiment 3

[0031] First, let the waste gas of the fertilizer plant be absorbed by orthophosphoric acid in the absorption tower to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; then the mixed solution is continuously circulated by a lift pump, and ammonia gas is repeatedly absorbed until diammonium hydrogen phosphate is completely generated Then pass into the ammonia distillation tower with a pipeline, and add 20ppm of organic denitrification agent composed of 40 g of methyl benzotriazole, 24 g of polyhexene imine, and 36 g of dibutyl phthalate; install in the nitrogen distillation tower Catalyst; finally, steam is introduced into the ammonia distillation tower, and the diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia gas; the ammonia gas is reduced to nitrogen under the action of the catalyst, and the diammonium hydrogen phosphate is pumped into the top of the absorption tower with a circulating pump ...

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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 waste gas of a chemical fertilizer plant in Yihe, and belongs to the field of waste gas treatment. Background technique [0002] Most of the exhaust gas discharged from the fertilizer plant is ammonia gas, which has a pungent odor, is harmful to the respiratory system, and is prone to acute respiratory diseases. Ammonia (NH3) has corrosive and irritating effects on the skin tissue in contact. Excessive gas, resulting in excessive ammonia concentration in the blood, will cause cardiac arrest and respiratory arrest through the reflex action of trigeminal nerve endings, which is life-threatening. There are also toxic trace organic pollutants, carcinogenic effects, 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 t...

Claims

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Application Information

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