Research on precise ammonia injection retrofit for SCR denitration systems in thermal powers

Abstract

Abstract:

After the popularization of ultralow emission standards for denitration systems in domestic thermal power plants, inaccurate ammonia injection of traditional SCR denitration systems has resulted in excessive NOx emissions, high ammonia escape rate,blockage of air preheaters and so on. Taking No.7 unit of a power plant in Jiangsu as an example, ammonia injection retrofit for the unit was executed sector by sector, and multipoint measurement system for NOx mass concentration and intelligent ammonia injection control logic were added. A big data prediction and analysis station for NOx was established, which can predict the NOx mass concentration more accurately. After the retrofit, the ammonia consumption of the unit is reduced by 8%~10%, NOx distribution at the outlet is uniform, the ammonia escape rate is reduced, the air preheater blockage problem is solved.The ultralow emission of the SCR denitration system is realized.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">NOfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">xfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">, precise ammonia injection, big data analysis, realfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">time prediction, ammonia escape, denitration, ultrafont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">low emission

HAO Zheng，HU Xiaofu，WANG Yun，WANG Yang，SHEN Xianming，LI Wei，WANG Hua.

Research on precise ammonia injection retrofit for SCR denitration systems in thermal powers [J]. Huadian Technology, 2019, 41(10): 8-11.

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Research on precise ammonia injection retrofit for SCR denitration systems in thermal powers

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