Effects of Ash Deposition and Face Velocity on the Performance of a Direct Air-Cooling Power Unit

doi:10.11930.2015.2.21

Abstract

Abstract: Ash deposition and face velocity reduction are the major factors which cause the backpressure increase of direct air-cooling power units. In this paper, the effects of ash deposition and face velocity on the backpressure and heat transfer coefficient are analyzed taking a 330-MW direct air-cooling power unit as a case and the preventive measures are proposed. The results show that as the ash thickness reaches 1.0 mm, the backpressure increases from the designated 34.0 kPa to 49.0 kPa , and the power output decreases 8.6 MW; when the face velocity drops from 2.2 m/s to 1.6 m/s, the backpressure increases from the designated 34.0 kPa to 50.1 kPa and the power output decreases 9.4 MW.

Key words: thermal power plant, direct air-cooling unit, ash deposition, face velocity, heat transfer coefficient, backpressure, power output

CLC Number:

TK264.1+1

WANG Li, ZHANG Yijiang, GUO Minchen, JI Zhiqin. Effects of Ash Deposition and Face Velocity on the Performance of a Direct Air-Cooling Power Unit[J]. Electric Power, 2015, 48(2): 21-26.

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URL: https://www.electricpower.com.cn/EN/10.11930.2015.2.21

https://www.electricpower.com.cn/EN/Y2015/V48/I2/21

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