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Analysis of energy utilization coefficient in heat, power and gas cogeneration system

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  • Zhongyou Zhao
  • Yali Guo
  • Shengqiang Shen

Abstract

This study presents the thermodynamic model of a heat, power and gas cogeneration system. The energy utilization coefficient μ, which is the ratio of the sum of gas calorific value and heat supplied to the boiler to the low calorific value of coal, is used as a criterion to evaluate the performance of the multi-production system. The emphasis was placed on the vaporization of the coal and the combustion in the boiler. For gas output 10,000 m-super-3·h-super-−1 and boiler steam load 130 t·h-super-−1, the change of gross coal consumption and energy available coefficient μ of the cogeneration system is calculated at different pyrogenation temperatures with three types of coals. The results show that the energy available coefficient has a maximum value for the cogeneration system, and the gross coal consumption of the cogeneration system is lower than that of two separation systems. In a large range of feeding coal to the boiler, the system gross coal consumption reaches its minimum value and the energy available coefficient μ reaches maximum when pyrogenation temperature is 700°C. And the optimal is realized at a higher temperature. Copyright , Manchester University Press.

Suggested Citation

  • Zhongyou Zhao & Yali Guo & Shengqiang Shen, 2008. "Analysis of energy utilization coefficient in heat, power and gas cogeneration system," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 3(3), pages 139-146, July.
    • Handle: RePEc:oup:ijlctc:v:3:y:2008:i:3:p:139-146
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    File URL: http://hdl.handle.net/10.1093/ijlct/3.3.139
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    1. Fang, Mengxiang & Luo, Zhongyang & Li, Xuantian & Wang, Qinghui & Ni, Mingjiang & Cen, Kefa, 1998. "A multi-product cogeneration system using combined coal gasification and combustion," Energy, Elsevier, vol. 23(3), pages 203-212.
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