A New Cleaner Power Generation System Based on Self-Sustaining Supercritical Water Gasification of Coal

  • LIU Changchun ,
  • HAN Wei ,
  • WANG Zefeng ,
  • ZHANG Na
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  • 1. Institute of Engineering Thermophysics, Chinses Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

网络出版日期: 2023-12-01

基金资助

The authors gratefully acknowledge the financial support of the National Key Research and Development Program of China (Grant No. 2016YFB0600105).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2021

A New Cleaner Power Generation System Based on Self-Sustaining Supercritical Water Gasification of Coal

  • LIU Changchun ,
  • HAN Wei ,
  • WANG Zefeng ,
  • ZHANG Na
Expand
  • 1. Institute of Engineering Thermophysics, Chinses Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China

Online published: 2023-12-01

Supported by

The authors gratefully acknowledge the financial support of the National Key Research and Development Program of China (Grant No. 2016YFB0600105).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2021

摘要

本文提出并研究了一种新的清洁发电系统(IPGS)。该系统将联合循环与超临界水煤气化相结合,根据温度和压力对合成气能量进行梯级利用,合成气的显热和潜热都可以回收到系统中,从而可以提高系统净发电效率。新系统的净发电效率比传统煤气化发电系统(GEPP)高出约6.4个百分点。㶲分析结果表明,该系统的㶲效率达到52.45%,较参比系统提高了13.94%,该系统㶲效率的提高主要得益于合成气能量回收过程、冷凝过程和合成气净化过程㶲损失降低。合成气燃烧过程是㶲损失最大的过程,在新系统中为 157.84 MW,该部分为进一步提升系统性能的突破点。此外,文章还对煤浆浓度、气化温度和气化压力等系统运行参数进行了研究。参数分析表明,与其他两个参数相比,煤浆浓度的变化对系统㶲效率影响更大。

本文引用格式

LIU Changchun , HAN Wei , WANG Zefeng , ZHANG Na . A New Cleaner Power Generation System Based on Self-Sustaining Supercritical Water Gasification of Coal[J]. 热科学学报, 2022 , 31(5) : 1380 -1391 . DOI: 10.1007/s11630-021-1515-3

Abstract

A new cleaner power generation system (IPGS) is proposed and investigated in this paper. Integrating combined cycle with supercritical water gasification of coal, the thermodynamic energy of the produced syngas is cascade utilized according to its temperature and pressure, both sensible and latent heat of the syngas can be recycled into the system, and thereby the net power efficiency can be about 6.4 percentage points higher than that of the traditional GE gasification based power plant (GEPP). The exergy analysis results show that the exergy efficiency of the proposed system reaches 52.45%, which is 13.94% higher than that of the GEPP, and the improvement in exergy efficiency of the proposed system mainly comes from the exergy destruction decline in the syngas energy recovery process, the condensation process and the syngas purification process. The syngas combustion process is the highest exergy destruction process with a value of 157.84 MW in the proposed system. Further performance improvement of the proposed system lies in the utilization process of syngas. Furthermore, system operation parameters have been examined on the coal mass fraction in the supercritical water gasifier (GF), the gasification temperature, and the gasification pressure. The parametric analysis shows that changes in coal concentration in the GF exert more influence on the exergy efficiency of the system compared with the other two parameters.

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