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A multi-product cogeneration system using combined coal gasification and combustion

Author

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  • Fang, Mengxiang
  • Luo, Zhongyang
  • Li, Xuantian
  • Wang, Qinghui
  • Ni, Mingjiang
  • Cen, Kefa

Abstract

A new system has been developed for clean and highly efficient utilization of coal. The coal is first gasified and the fuel gas is then used for industrial purposes in town gas or as a fuel for gas turbines. The char residue from the gasifier is burned in a circulating fluidized-bed combustor to generate steam for power generation, process heating, refrigeration, air conditioning, etc. The ash is used to produce construction materials. Metals such as vanadium and uranium can be extracted if the metal contents of coal are sufficiently high. An important system component is the combined gasifier–combustor. Experiments show that the system can produce gas and steam simultaneously. The gas heating value is 10–14MJ/Nm3 and the fuel conversion is over 90%. The system has low emissions and low cost. A demonstration system has been constructed at the Yangzhong Thermal Power Plant in Jiangshu Province of China. It produces 3 500Nm3/h of dry gas and 75mt/h steam. The CFB boiler has been in commercial operation since April 1995. It has high efficiency, good fuel adaptability, and a high load turndown ratio.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:23:y:1998:i:3:p:203-212
    DOI: 10.1016/S0360-5442(97)00085-6
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    Cited by:

    1. Zhang, Yongliang & Jin, Bo & Zou, Xixian & Zhao, Haibo, 2016. "A clean coal utilization technology based on coal pyrolysis and chemical looping with oxygen uncoupling: Principle and experimental validation," Energy, Elsevier, vol. 98(C), pages 181-189.
    2. Zhang, Jianyun & Liu, Pei & Zhou, Zhe & Ma, Linwei & Li, Zheng & Ni, Weidou, 2014. "A mixed-integer nonlinear programming approach to the optimal design of heat network in a polygeneration energy system," Applied Energy, Elsevier, vol. 114(C), pages 146-154.
    3. 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.
    4. Guo, Zhihang & Wang, Qinhui & Fang, Mengxiang & Luo, Zhongyang & Cen, Kefa, 2014. "Thermodynamic and economic analysis of polygeneration system integrating atmospheric pressure coal pyrolysis technology with circulating fluidized bed power plant," Applied Energy, Elsevier, vol. 113(C), pages 1301-1314.

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