Experimental Study on Ammonia Injection Optimization for Denitration System for 1000MW Coal-Fired Unit

Yudong Huang; Longtao Li; Ketao Xu; Bo Liu

doi:10.54097/4fa13815

Authors

Yudong Huang
Longtao Li
Ketao Xu
Bo Liu

DOI:

https://doi.org/10.54097/4fa13815

Keywords:

Coal-fired unit; SCR; AIG; Ammonia escape.

Abstract

To improve NOx distribution uniformity at the SCR reactor outlet, reduce ammonia escape concentration, and minimize air preheater plugging risk, an ammonia injection optimization experiment was conducted on the SCR denitrification system of a 1000 MW coal-fired unit. After optimization, at 1000 MW load, the relative standard deviation of NOx concentration distribution at the A and B side SCR reactor outlets decreased from 53.8% and 78.9% to 17.5% and 18.0%, respectively, while the average ammonia escape concentration decreased from 1.92 mg/m³ to 1.39 mg/m³. Under different unit loads, ammonia escape remained stable between 1.39-1.61 mg/m³, NOx concentration distribution uniformity at the SCR outlet significantly improved, and ammonia escape concentration decreased to varying degrees, providing reference for the safe, stable, and economical operation of denitrification systems.

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