Exergy analysis on the process with integrated supercritical water gasification of coal and syngas separation
Exergy analysis on the process with integrated supercritical water gasification of coal and syngas separation
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DOI：
10.1016/j.applthermaleng.2017.09.083
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发表时间：
2018-01
影响因子：
6.4
通讯作者：
Zhewen Chen;Xiaosong Zhang;W. Han;Lin Gao;Sheng Li
中科院分区：
文献类型：
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作者：
Zhewen Chen;Xiaosong Zhang;W. Han;Lin Gao;Sheng Li
超临界水气化技术是一种很有前途的煤炭清洁高效利用技术。对煤与合成气分离一体化超临界水蒸气分离过程进行了（火用）分析，以了解该过程的（火用）分布。为气化器提供的热量的能量水平被提升到合成气的能量水平，这是由从煤到合成气的能量水平的降低驱动的。得到了不同水煤浆浓度下气化炉的最低供热温度。随CWSC的增大，总火用损失先增大后减小。当CWSC约为10%时，过程的总火用损失最大。过程的火用效率与总火用损失呈匡威的趋势。当CWSC在6%~ 20%范围内时，最大火用效率为89.18%。分析了火用损产生的原因。
Supercritical water gasification (SCWG) is a promising technology for clean and efficient coal utilization. The exergy analyses on the processes with integrated SCWG of coal and syngas separation are conducted for clear understanding about the exergy distributions in the processes. The energy level of the heat provided for the gasifier is upgraded to the energy level of the syngas, which is driven by the decrease of energy levels from the coal to the syngas. The minimum temperatures of the heat provided for the gasifier are obtained in different coal-water-slurry concentrations (CWSCs). The total exergy destruction firstly increases, and then decreases with increasing CWSC. The maximum total exergy destruction of the process is obtained when the CWSC is approximately 10%. The exergy efficiency of the process has a converse trend with the total exergy destruction. When the CWSC is in the range of 6% and 20%, the maximum exergy efficiency is 89.18%. The origins for the production of the exergy destruction are also studied.