Journal of Lanzhou University of Technology

Journal of Lanzhou University of Technology ›› 2021, Vol. 47 ›› Issue (2): 32-38.

• Mechanical Engineering and Power Engineering • Previous Articles     Next Articles

Effect of flue gas waste heat combined heating on performance of biomass direct combustion power generation system

LI Jin-ping1,2,3,4, YANG Xiao-yu2,4, ZHANG Bo2,4, HUANG Juan-juan1,2,3,4, WANG Chun-long1,2,3,4   

  1. 1. Western China Energy & Environment Research Center, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    2. Key Laboratory of Complementary Energy System of Biomass and Solar Energy of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    3. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou Univ. of Tech., Lanzhou 730050, China;
    4. College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2020-03-30 Online:2021-04-28 Published:2021-05-11

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Abstract: Aiming at the situation that the biomass direct-fired power generation system has a large amount of water vapor and latent heat recovery potential, a combined heat and power system integrating biomass direct-fired power generation with an absorption heat pump and a water source heat pump is proposed for the first time. The composite heating system is modeled by TRNSYS software, and its stability of the systemwas analyzed. The exergy analysis of the system was performed,and the benefits of the system were finally analyzed. The results show that the composite heating system can stabilize the output heat for the user during the heating season, and the average coefficient of performance of the absorption heat pump in the heating season is 1.61, and the average coefficient of performance of the water source heat pump is 4.32. The exergy efficiency of the composite heating system is 41.85%.After adding the compound heating system, theenergy saving rate increased by 5.2%, the comprehensive energyutilization rate increased by 7.8%, the waste gas heat recovery rate increased by 15.5%, the system can save 6 416.5 t of standard coal annually, reducing16 682.98 t of CO2, 128.33 t of SO2, and 449.16 t of NOX each year.

Key words: flue gas waste heat, TRNSYS software, exergy analysis, emission reduction

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