Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions

Jiayou Liu, Xiaoyun Gong, Wenhua Zhang, Fengzhong Sun and Qingbiao Wang
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Jiayou Liu: College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Xiaoyun Gong: Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Wenhua Zhang: Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Fengzhong Sun: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Qingbiao Wang: College of Resources, Shandong University of Science and Technology, Tai’an 271019, China

Energies, 2020, vol. 13, issue 2, 1-19

Abstract: Recovering flue gas waste heat is beneficial to improving the unit efficiency in power plants. To obtain the change rules of performance parameters of a flue gas waste heat cascade recovery system (FWCRS) under variable working conditions, an experiment bench was designed and built. The variation laws of the inlet temperature and exhaust flue gas temperature of a low temperature economizer (LTE), the inlet and outlet air temperature of an air preheater (AP), the heat exchange quantities of the AP, LTE, and front-located air heater and an additional economizer (AE), as well as the waste heat recovery efficiency, the system exergy efficiency, and the energy grade replacement coefficient were obtained as the flue gas flow, flue gas temperature, bypass flue gas ratio, air temperature, and circulating water flow in AE changed. Using an orthogonal test, the flue gas temperature, bypass flue gas ratio and air temperature were proved to be the significant factors affecting the performance parameters of FWCRS, and the bypass flue gas ratio was suggested as an adjusting parameter of FWCRS under variable working conditions.

Keywords: flue gas waste heat; cascade recovery; variable working conditions; performance parameters (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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