Thermodynamic and economic analyses of a coal and biomass indirect coupling power generation system
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RESEARCH ARTICLE
Buqing YE, Rui ZHANG, Jin CAO, Bingquan SHI, Xun ZHOU, Dong LIU
Thermodynamic and economic analyses of a coal and biomass indirect coupling power generation system
© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The coal and biomass coupling power generation technology is considered as a promising technology for energy conservation and emission reduction. In this paper, a novel coal and biomass indirect coupling system is proposed based on the technology of biomass gasification and co-combustion of coal and gasification gas. For the sake of comparison, a coal and biomass direct coupling system is also introduced based on the technology of cocombustion of coal and biomass. The process of the direct and the indirect coupling system is simulated. The thermodynamic and economic performances of two systems are analyzed and compared. The simulation indicates that the thermodynamic performance of the indirect coupling system is slightly worse, but the economic performance is better than that of the direct coupling system. When the blending ratio of biomass is 20%, the energy and exergy efficiencies of the indirect coupling system are 42.70% and 41.14%, the internal rate of return (IRR) and discounted payback period (DPP) of the system are 25.68% and 8.56 years. The price fluctuation of fuels and products has a great influence on the economic performance of the indirect coupling system. The environmental impact analysis indicates that the indirect coupling system can inhibit the propagation of NOx and reduce the environmental cost. Keywords biomass, indirect coupling system, process simulation, thermodynamic analysis, economic analysis
Received Aug. 2, 2019; accepted Feb. 17, 2020; online Apri. 30, 2020
✉), Jin CAO, Bingquan SHI, Xun ZHOU,
Buqing YE, Rui ZHANG (
✉
Dong LIU ( ) MIIT Key Laboratory of Thermal Control of Electronic Equipment, and Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mails: [email protected] (Rui ZHANG); [email protected] (Dong LIU)
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Introduction
With the decrease of fossil fuel resources and the serious environmental pollution caused by fossil fuel combustion, clean and renewable energy has attracted more and more attention [1–3]. Biomass is one of the most abundant renewable resources around the world, and the annual production of straw resources in China is about 800 million tons [4]. Biomass can be combusted directly in boilers to generate electricity. Unfortunately, the efficiency of biomass combustion power generation system is lower than that of conventional coal-fired power plants, because biomass has a lower calorific value than coal [5]. To improve the efficiency, a novel coal and biomass coupling power generation technology has been proposed [6] based on the combined use of coal and biomass in a system, whose efficiency can reach more than 30% [5,7]. Therefore, this technology has been considered as a promising alternativ
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