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

LIU Changchun, HAN Wei, WANG Zefeng, ZHANG Na

Journal of Thermal Science ›› 2022, Vol. 31 ›› Issue (5) : 1380-1391.

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Journal of Thermal Science ›› 2022, Vol. 31 ›› Issue (5) : 1380-1391. DOI: 10.1007/s11630-021-1515-3  CSTR: 32141.14.JTS-021-1515-3

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

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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.

Key words

power generation / clean production / supercritical water gasification / coal gasification / cascade utilization / combined cycle

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LIU Changchun , HAN Wei , WANG Zefeng , ZHANG Na. A New Cleaner Power Generation System Based on Self-Sustaining Supercritical Water Gasification of Coal[J]. Journal of Thermal Science, 2022, 31(5): 1380-1391 https://doi.org/10.1007/s11630-021-1515-3

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Funding

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

RIGHTS & PERMISSIONS

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