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Method for increasing selective non-catalytic reduction denitration efficiency

A denitration efficiency, non-catalytic technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low denitration efficiency, low utilization rate of reducing agent, easy oxidation of NOx, etc., to improve denitration efficiency, reduce Consumption of reducing agent, effect of inhibiting oxidation reaction

Inactive Publication Date: 2011-11-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low denitrification efficiency, easy oxidation of NOx and low utilization rate of reducing agent in SNCR system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The ammonium bicarbonate solution is directly sprayed into the outlet pipe of the coal-fired furnace at 1000°C, the concentration of ammonium bicarbonate is 150,000mg / L, the spray rate of the ammonium bicarbonate solution is 23,333L / h, and the average flow rate of the flue gas in the SNCR system is 1,500,000 m 3 / h The concentration of nitrogen oxides at the inlet is 600mg / m 3 , the concentration of nitrogen oxides at the outlet is 300mg / m 3 , the molar ratio of ammonium bicarbonate to NO is 1.4:1, and the denitrification rate is 50%. The test was carried out continuously for 24 hours, during which the SNCR system operated stably and the denitrification rate was maintained at around 50%.

[0015]

Embodiment 2

[0017] Spray a mixed solution of ammonium bicarbonate and sodium zeolite powder into the outlet pipe of the coal-fired furnace at 1000°C, the concentration of ammonium bicarbonate is 150,000mg / L, the dosage of sodium zeolite powder is 350g / h, and the spray speed of the mixed solution is 23,333 L / h, the concentration of nitrogen oxides at the inlet of SNCR is 600mg / m 3 , the concentration of nitrogen oxides at the outlet is 150mg / m 3 , the molar ratio of ammonium bicarbonate to NO is 1.4:1, and the denitrification rate is 75%. The test lasted for 24 hours, during which the SNCR system operated stably and the denitrification rate was maintained at about 75%.

[0018]

Embodiment 3

[0020] Spray a mixed solution of ammonium bicarbonate and sodium zeolite powder into the outlet pipe of a coal-fired furnace at 1000°C, where the concentration of ammonium bicarbonate is 105,000 mg / L, the dosage of sodium zeolite powder is 244g / h, and the spray speed of the mixed solution is 23,333 L / h, the concentration of nitrogen oxides at the inlet of SNCR is 600mg / m 3 , the concentration of nitrogen oxides at the outlet is 148.2mg / m 3 , the molar ratio of ammonium bicarbonate to NO is 1:1, and the denitrification rate is 75.3%. It can be seen that increasing the dosage of sodium zeolite powder can increase the denitrification efficiency of the system slightly. The test was carried out continuously for 24 hours, during which the SNCR system operated stably, and the denitrification rate remained at about 75%.

[0021]

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Abstract

The invention relates to a method for increasing selective non-catalytic reduction (SNCR) denitration efficiency, and belongs to the field of control of nitrogen oxides. The method comprises a step of spraying natrolite powder in an SNCR system while spraying ammonia liquid, urea, ammonium hydrogen carbonate or ammonium carbonate serving as a reducing agent in the SNCR system; and thus, the utilization rate of the reducing agent of the SNCR system is increased by a sodium element and other trace elements such as nickel, titanium, vanadium, molybdenum, selenium and the like in the natrolite powder, the denitration efficiency is increased, the optimal reaction temperature range of the system is expanded, the oxidation reaction of the reducing agent and the nitrogen oxide is suppressed, the leakage of the reducing agent of the system is reduced, the consumption of the reducing agent of the SNCR system is reduced, and a basis is provided for application of the SNCR system under more working conditions.

Description

technical field [0001] The invention relates to a method for improving the denitrification efficiency of selective non-catalytic reduction, which belongs to the field of nitrogen oxide control. Background technique [0002] Nitrogen oxide (NOx) is one of the main air pollutants, and thermal power plants are one of the most important sources of nitrogen oxide pollution. Most of the NOx emitted by thermal power plants is NO, which is not very toxic, but NO is in the atmosphere can be oxidized to NO 2 , its toxicity is 4~5 times that of NO, when NO 2 content up to 150×10 －6 When it is used, it will have a strong stimulating effect on human organs. In addition, NOx also leads to the formation of photochemical smog and acid rain. In a specific geographical location, when there is a temperature inversion or unfavorable meteorological conditions for diffusion, photochemical smog will gather and linger, deteriorating regional air quality, reducing atmospheric visibility, reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 宋存义常冠钦郭坤余豁然张秋林邢奕汪莉钱大益童震松梁宝瑞赵荣志金科学张志鸿
Owner UNIV OF SCI & TECH BEIJING
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