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Method for treating high-concentration ammonia and nitrogen in coking gas

A high-concentration technology of coking gas, which is applied in combustible gas purification, combustible gas purification/transformation, petroleum industry, etc., can solve problems such as high energy consumption and secondary pollution, and achieve the effect of avoiding secondary pollution and complete desorption

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] The present invention revolves around the problems of high energy consumption in the process of processing ammonia gas in the prior art, the need for an alkaline environment, and secondary pollution during the process, and provides a method that can convert NH 3 Convert directly to N 2 The method is simple and effective, and realizes catalytic conversion at a lower cost, making it possible to use this method in practice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] First, the coking gas is desulfurized and then absorbed in the absorption tower with orthophosphoric acid to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; ammonium; then pipe the generated diammonium hydrogen phosphate into the ammonia distillation tower, add 10ppm organic denitrification agent; install Bi-Lu-Y / β-Fe in the ammonia distillation tower 3 o 4 Catalyst; then steam is introduced into the ammonia distillation tower, diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia; finally ammonia is reduced to nitrogen under the action of the catalyst, and diammonium hydrogen phosphate is pumped into the absorption tower with a circulating pump top, to reabsorb the ammonia in the pipeline gas.

[0023] By using the method of the invention to treat waste gas with an ammonia nitrogen concentration of 3000 mg / L in a coking gas plant, the nitrogen nitrogen concentration is reduced from 3000...

example 2

[0025] First, the coking gas is desulfurized and then absorbed in the absorption tower with orthophosphoric acid to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; ammonium; then pipe the generated diammonium hydrogen phosphate into the ammonia distillation tower, add 30ppm organic denitrification agent; install Bi-Lu-Y / β-Fe in the ammonia distillation tower 3 o 4 Catalyst; then steam is introduced into the ammonia distillation tower, diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia; finally ammonia is reduced to nitrogen under the action of the catalyst, and diammonium hydrogen phosphate is pumped into the absorption tower with a circulating pump top, to reabsorb the ammonia in the pipeline gas.

[0026] Using the method of the invention to treat waste gas with an ammonia nitrogen concentration of 3000 mg / L in a coking gas plant, the ammonia nitrogen concentration is reduced from 4000 mg / ...

example 3

[0028] First, the coking gas is desulfurized and then absorbed in the absorption tower with orthophosphoric acid to generate a mixed solution of diammonium hydrogen phosphate and ammonium dihydrogen phosphate; ammonium; then pipe the generated diammonium hydrogen phosphate into the ammonia distillation tower, add 20ppm organic denitrification agent; install Bi-Lu-Y / β-Fe in the ammonia distillation tower 3 o 4 Catalyst; then steam is introduced into the ammonia distillation tower, diammonium hydrogen phosphate is decomposed into ammonium dihydrogen phosphate and ammonia; finally ammonia is reduced to nitrogen under the action of the catalyst, and diammonium hydrogen phosphate is pumped into the absorption tower with a circulating pump top, to reabsorb the ammonia in the pipeline gas.

[0029] Using the method of the invention to treat waste gas with an ammonia nitrogen concentration of 5000 mg / L in a coking gas plant, the ammonia nitrogen concentration is reduced from 5000 mg / ...

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PUM

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Abstract

The invention relates to a method for treating high-concentration ammonia and nitrogen in coking gas and belongs to the field of wastewater treatment. Coking gas containing ammonia and nitrogen is desulfurized and absorbed by orthophosphate before being introduced into an ammonia still, and N2 is generated and emitted to air under the catalytic action of organic denitrifying agent and heavy metal oxide. The catalyst mainly comprises, by mass percent, 20%-25% of bismuth oxide, 15%-20% of lutetium oxide, 10-15% of yttrium oxide, beta-Fe3O4 and the like. The organic denitrifying agent comprises, by mass percent, 40%-60% of polypropylene cyanide, 40%-60% of ethylene cyanide, and 10%-20% of CH3(SiOH)3. The method for treating ammonia and nitrogen waste gas has the advantages that resource consumption is low, recycling rate of absorbent is high, secondary pollution is avoided and the like. After the waste gas with the ammonia-nitrogen concentration of 3000-4000mg / L from a coking gas plant is treated by the method, the ammonia-nitrogen concentration decreases to lower than 12mg / L, and removal rate reaches more than 99.96%.

Description

technical field [0001] The invention discloses a method for treating high-concentration ammonia nitrogen in coking gas, belonging to the field of waste gas treatment. Background technique [0002] Coking gas refers to the use of several kinds of bituminous coal to make coking coal. After high-temperature dry distillation in the coke oven, combustible gas is obtained while producing tar products, but a large amount of ammonia gas will be produced in the specific production process. After a person inhales a large amount of ammonia gas in a short period of time, tears, sore throat, hoarseness, cough, bloodshot sputum, chest tightness, dyspnea may occur, accompanied by dizziness, headache, nausea, vomiting, fatigue, etc. In severe cases, pulmonary edema may occur , Adult respiratory distress syndrome, and respiratory irritation symptoms may occur at the same time. If too much ammonia gas is inhaled, the ammonia concentration in the blood is too high, which will cause cardiac ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/12
Inventor 雷春生张凤娥包铠
Owner CHANGZHOU UNIV
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