Study on Online SCR Ammonia Slip Prediction Method

doi:10.11930/j.issn.1004-9649.201708302

Abstract

Abstract: The excessive ammonia injection due to the unreliable ammonia CEMS analysis result can cause high ammonia slip and severe ammonium bisulfate deposition on air preheater. On the basis of laboratory and field tests, a novel prediction method for ammonia slip considering the SCR reactor potential and deactivation tendency, is studied and presented. The application results on a 350 MW unit indicated that the ammonia slip could be predicted online based on the real-time DCS parameters, such as unit load, NO_x concentration inlet and De-NO_x efficiency, etc. With the predicted ammonia slip online, the ammonia flow injection can be adjusted properly to avoid excessive ammonia slip. Furthermore, the predicted ammonia slip value can be used for the early warning and decision making of lifetime management for SCR catalyst layer.

Key words: coal power unit, flue gas denitrification, SCR reactor potential, ammonia slip, prediction online, ammonium bisulfate

CLC Number:

X511
TM621.9

SONG Yubao, CHENG Shijun, YAO Yan, AN Dexin, JIN Lipeng, FANG Zhaojun. Study on Online SCR Ammonia Slip Prediction Method[J]. Electric Power, 2018, 51(10): 145-149.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201708302

https://www.electricpower.com.cn/EN/Y2018/V51/I10/145

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