System Performance and Pollutant Emissions of Micro Gas Turbine Combined Cycle in Variable Fuel Type Cases

Xiaotao Zhang, Yichao Wu, Wenxian Zhang, Qixian Wang and Aijun Wang ()
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Xiaotao Zhang: College of Energy and Power Engineering, North China University of Water Resources and Electric Power, 36 North Ring Road, Jinshui District, Zhengzhou 450011, China
Yichao Wu: College of Energy and Power Engineering, North China University of Water Resources and Electric Power, 36 North Ring Road, Jinshui District, Zhengzhou 450011, China
Wenxian Zhang: College of Energy and Power Engineering, North China University of Water Resources and Electric Power, 36 North Ring Road, Jinshui District, Zhengzhou 450011, China
Qixian Wang: College of Energy and Power Engineering, North China University of Water Resources and Electric Power, 36 North Ring Road, Jinshui District, Zhengzhou 450011, China
Aijun Wang: College of Energy and Power Engineering, North China University of Water Resources and Electric Power, 36 North Ring Road, Jinshui District, Zhengzhou 450011, China

Energies, 2022, vol. 15, issue 23, 1-17

Abstract: This study focuses on an investigation of the operating performance and pollutant emission characteristics of a micro gas turbine combined cycle using biomass gas, replacing natural gas. The models of both recuperative cycle micro gas turbines with a waste heat utilization system and a micro gas-steam turbine combined cycle system are established. When the gas turbine works at 100 kW and the same types of fuel are burnt, the recuperative cycle system consumes less fuel than the gas-steam combined cycle system. The electric efficiency of the recuperative cycle system can reach more than 29%, which is higher than 24% of the gas-steam combined system. The combined cycle thermal efficiency of the recuperative system is as high as 66%, with 36% waste heat utilization efficiency. The electrical efficiency of the recuperative cycle system in the biomass gas case decreases, while that of the gas-steam combined cycle system undergoes little change. When the gas turbine power output increases from 50 kW to 100 kW, the electrical efficiency and combined cycle thermal efficiency increases, but the thermal efficiency of waste heat utilization of recuperative cycle decreases, the NO X and SO 2 emissions gradually rise. Under the same working conditions, the NO X emissions of the recuperative cycle system are greater than that of the steam-gas combined cycle system.

Keywords: biomass gas; recuperative cycle system; gas-steam combined cycle system; various loads; NO emissions (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: 2022
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