Incorporating IGCC and CaO sorption-enhanced process for power generation with CO₂ capture

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• 作者：Shiyi Chen ; Wenguo Xiang ; ^{wgxiang@seu.edu.cn} ; Dong Wang ; Zhipeng Xue
• 关键词：Coal ; IGCC ; Sorption-enhanced process ; CaO ; CO2 capture
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：July, 2012
• 卷：95
• 期：Complete
• 页码：285-294
• 文件大小：503 K

摘要

Integrated gasification combined cycle (IGCC) is a power generation technology to convert solid fuels into electricity. IGCC with CCS is regarded as a promising option to mitigate CO₂ emission. In this paper, the CaO sorption-enhanced process is incorporated downstream with coal gasification to produce a hydrogen-rich stream for electricity production and CO₂ separation. A WGS-absorber substitutes the high- and low-temperature water-gas shift reactors and desulfurization units in conventional IGCC-CCS to produce a hydrogen-rich stream, which is sent onto a gas turbine. CaO is used as the sorbent to enhance hydrogen production and for CO₂ capture. Regeneration of CaO is completed via calcination in a regenerator vessel. The IGCC with CaO sorption-enhanced process is modeled and simulated using Aspen Plus software. Two commercial available gasification technologies, Shell and Texaco, are integrated with the sorption-enhanced process. The results showed IGCC with CaO sorption-enhanced process has a satisfactory system performance. Even though the net electricity efficiency is not as high as expected, just around 30-33%, the system has a high CO₂ capture efficiency 鈭?7%and low pollutant emissions. Moreover, compared with conventional IGCC-CCS, the schematic diagram of the IGCC-CCS process is simplified. Parameters that affect the plant performance are analyzed in the sensitive analysis, including WGS-absorber temperature, H₂O/CO ratio, pressure, etc. Some challenges to the system are also discussed.