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Thermodynamic study on a novel lignite poly-generation system of electricity-gas-tar integrated with pre-drying and pyrolysis

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  • Liu, Rongtang
  • Liu, Ming
  • Fan, Peipei
  • Zhao, Yongliang
  • Yan, Junjie

Abstract

The efficient and clean use of lignite is strategically important to sustainable development. Predrying technology is a competitive approach to solve the utilization issue of the high moisture, and the pyrolysis technology is an ideal upgrading method to realize high value-added components extraction. However, the two technologies are normally used separately. By integrating the two technologies, the cascade utilization of energy may be realized, and the utilization efficiency of lignite may be increased accordingly. Therefore, a steam predrying coupled with lignite-pyrolysis power system (PPPS) is proposed in this paper. Theoretical models are developed on the basis of thermodynamics to assess the properties of the proposed system, and a case analysis is performed to determine the quantitative consequences of the PPPS. Moreover, energy and exergy analyses are performed to uncover the energy saving mechanism. Results indicate that the proposed system can evidently increase the thermal efficiency by approximately 4.43% relatively based on the higher heating value, and by approximately 4.45% relatively based on the lower heating value. The PPPS can noticeably increase the exergy efficiency by approximately 4.48% relatively owing to the integration of the lignite predrying and pyrolysis technologies.

Suggested Citation

  • Liu, Rongtang & Liu, Ming & Fan, Peipei & Zhao, Yongliang & Yan, Junjie, 2018. "Thermodynamic study on a novel lignite poly-generation system of electricity-gas-tar integrated with pre-drying and pyrolysis," Energy, Elsevier, vol. 165(PB), pages 140-152.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pb:p:140-152
    DOI: 10.1016/j.energy.2018.09.169
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