Performance Analysis and Adjustment of Thermocompressor in Exhaust and Waste Heat Utilization System of 330 MW Air Cooling Unit

doi:10.11930/j.issn.1004-9649.202001094

Abstract

Abstract: This paper introduces the configuration of the three-stage cascade exhaust and waste heat utilization system of the direct air cooling unit. In particular, the component structure and working principle of its most critical equipment, i.e., the thermocompressor, is elaborated and the key factors affecting the thermocompressor performance are analyzed. Then the orthogonal testing is carried out on the three-stage cascade exhaust and waste heat utilization system of a 330 MW coal-fired direct air cooling unit in a power plant. The analysis on the test results show that the boost ratio of the thermocompressor has significant influence on its ejection ratio. In addition, the verification test result indicates the consistency between the optimal scheme obtained from the orthogonal testing and the actual operation. At last, through the testing of effect of various boost ratio on the ejection ratio, it is concluded that whenever the boost ratio is outside of its designed range, either higher than the upper limit or lower than the lower limit, the ejection ratio will all drop down greatly. Therefore, the boost ratio should be strictly controlled within the designed range during practical operation.

Key words: waste heat utilization of exhaust steam, thermocompressor, ejection ratio, boost ratio, high back pressure, orthogonal test

HUANG Zhikun, CEN Lingshan, LI Zhihua, LI Yang, WANG Enzhen, ZHANG Pan. Performance Analysis and Adjustment of Thermocompressor in Exhaust and Waste Heat Utilization System of 330 MW Air Cooling Unit[J]. Electric Power, 2020, 53(12): 277-283.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202001094

https://www.electricpower.com.cn/EN/Y2020/V53/I12/277

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