Element utilization and primary energy saving analysis for the coal-based polygeneration systems of synfuels-power

doi:10.16085/j.issn.1000-6613.2017-2502

Abstract

Abstract: The coal-based polygeneration system of synfuels-power has been regarded as one of promising technologies to achieve the maximization of coal utilization and clean production. This study calculates the element utilization ratio, including element carbon (C) and hydrogen (H), together with the primary energy saving to analysis the element utilization and energy conversion performances in two types of coal-based polygeneration systems. The results indicated that both the elements utilization ratio and energy conversion ratio increase with circulation ratio (r). The unreacted gas circulation can improve effectively the element utilization ratio and primary energy saving efficiency. The circulatory series system with water gas shift process (WGS) has better energy and material utilization performance. Its maximum primary energy is 19.45% which is 5.62% higher than that of series case without WGS. Its maximum C and H utilization ratio is 29.08% and 37.89%, respectively, as the ratio of synfuels output to power output (λ) is equal to 3.89. When λ ranges from 0.52 to 1.94, the performance of carbon utilization is nearly same for two systems. While the optimum hydrogen utilization ratio 32.97% is reached in series case without WGS which is approximately 3.50% higher than that of series case with WGS.

Key words: polygeneration system, coal-based synfuels, water gas shift, Fischer-Tropsch synthesis, IGCC

摘要： 煤基液体燃料与电力生产的集成是实现煤炭利用与洁净化生产的可行方案之一。本文通过计算两种不同集成特征的煤基液体燃料-电多联产系统的碳、氢元素利用率以及节能率，分析了多联产系统的元素利用和能量转换规律。结果表明，元素利用率和节能率均随循环比r的增加而增大。未反应气体循环可以有效提高元素利用率，同时使节能性增强。采用水煤气变换的循环串联多联产系统具有最佳的节能效率和元素利用率，最大节能率达19.45%，比无水煤气变换过程的循环串联多联产系统最大节能率高5.62%。且在化动比λ为3.89时，碳、氢利用率分别达到峰值，为29.08%以及37.89%。但当0.52≤λ≤1.94时，两种多联产系统具有相近的碳利用率，此时无变换多联产系统能达到最优的氢利用率为32.97%，比相同条件下有变换多联产系统高3.50%。

关键词: 多联产系统, 煤基液体燃料, 水煤气变换, 费托合成, 整体煤气化联合循环

CLC Number:

TQ53

YANG Xiaoli, YU Gewen, WANG Yanming, WU Gangqiang. Element utilization and primary energy saving analysis for the coal-based polygeneration systems of synfuels-power[J]. Chemical Industry and Engineering Progress, 2018, 37(S1): 49-56.

杨小丽, 于戈文, 王延铭, 吴刚强. 煤基液体燃料-电多联产系统元素利用与节能性分析[J]. 化工进展, 2018, 37(S1): 49-56.

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