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Experimental Study on Operation Regulation of a Coupled High–Low Energy Flue Gas Waste Heat Recovery System Based on Exhaust Gas Temperature Control

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  • Jiayou Liu

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China
    Department of Resources and Civil Engineering, Shandong University of Science and Technology, Tai’an 271019, China)

  • Fengzhong Sun

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

Abstract

Controlling the exhaust gas temperature (EGT) of coal–fired boilers at a reasonable value is beneficial to ensuring unit efficiency and preventing acid corrosion and fouling of tail heating surfaces in power plants. To obtain the operation regulation of coupled high–low energy flue gas waste heat recovery system (CWHRS) under a given EGT, experimental equipment was designed and built. Experiments were carried out to maintain the exhaust gas temperature under different flue gas flow, flue gas temperature and air temperature conditions. As the flue gas flows, the flue gas temperatures and air temperatures increased, and the bypass flue gas flow proportions or the water flows of the additional economizer were increased to maintain the EGT at about 85 °C. An improved low temperature economizer (LTE) and front located air heater (FAH) system were put forward. As the flow of the crossover pipe increased, the EGT and the inlet water temperature of the LTE increased. As the flow of the circulating loop increased, the EGT and the inlet water temperature of the LTE decreased. Operation regulations of LTE–FAH system under four cases were given. The operation regulations of CWHRS and LTE–FAH system can provide references for power plant operation.

Suggested Citation

  • Jiayou Liu & Fengzhong Sun, 2019. "Experimental Study on Operation Regulation of a Coupled High–Low Energy Flue Gas Waste Heat Recovery System Based on Exhaust Gas Temperature Control," Energies, MDPI, vol. 12(4), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:4:p:706-:d:207997
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    References listed on IDEAS

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    Cited by:

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    2. Jiayou Liu & Xiaoyun Gong & Wenhua Zhang & Fengzhong Sun & Qingbiao Wang, 2020. "Experimental Study on a Flue Gas Waste Heat Cascade Recovery System under Variable Working Conditions," Energies, MDPI, vol. 13(2), pages 1-19, January.

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