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Proposal and assessment of a solar-coal thermochemical hybrid power generation system

火用 工艺工程 可用能 合成气 太阳能 发电 环境科学 热能 超临界流体 能量转换 废物管理 热力学 工程类 功率(物理) 化学 电气工程 有机化学 物理
作者
Xiaodong Xue,Wei Han,Zefeng Wang,Hongguang Jin,Xiaodong Wang
出处
期刊:Applied Thermal Engineering [Elsevier BV]
卷期号:219: 119584-119584 被引量:2
标识
DOI:10.1016/j.applthermaleng.2022.119584
摘要

The thermochemical complementarity is an efficient path to improve the utilization efficiency of coal and address the intermittence of solar energy. In this paper, a solar-coal thermochemical hybrid power generation system based on supercritical water gasification is proposed, and the feature is that the low gasification temperature of 650 °C makes it feasible to use concentrated solar energy to provide reaction heat for the gasification process. The energy and exergy analysis methods are used to evaluate the thermodynamic performance of the system with a net power output of 500 MW. The results show that the net power generation efficiency and exergy efficiency of the proposed system can reach 53.06 % and 52.24 %, respectively, which are approximately 6.94 and 6.83 percentage points higher than those of the reference system. The significant role of thermochemical method is that the chemical energy of syngas produced by the proposed system is 851.57 MW, which is increased by approximately 29.70 %. Through the energy utilization diagram analysis, it is found that the key to performance improvement is that the exergy destruction of the fuel conversion process and heat exchange process are decreased by 10.36 % and 54.68 %, respectively. Finally, the proposed system has better performance and lower exergy destruction. The solar thermal energy of low energy level is converted into syngas chemical energy of high energy level, and the upgrading of solar energy is achieved. In addition, the proposed system is simpler, and eliminates the air separation unit and syngas purification unit. This work provides a promising method for the complementary utilization of solar energy and coal.
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