Incorporating IGCC and CaO sorption-enhanced process for power generation with CO2 capture
Incorporating IGCC and CaO sorption-enhanced process for power generation with CO2 capture
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DOI：
10.1016/j.apenergy.2012.02.056
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发表时间：
2012-07
期刊：
影响因子：
11.2
通讯作者：
Shiyi Chen;Wenguo Xiang;Dong Wang;Zhipeng Xue
中科院分区：
文献类型：
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作者：
Shiyi Chen;Wenguo Xiang;Dong Wang;Zhipeng Xue
综合气化联合循环（IGCC）是一种将固体燃料转化为电能的发电技术。IGCC结合CCS被认为是一种很有前景的减少二氧化碳排放的方法。在本文中，将CaO吸附强化工艺与煤气化结合在下游，产生用于发电和二氧化碳分离的富氢流。wgs吸收器取代了传统IGCC-CCS中的高温和低温水煤气转换反应器和脱硫装置，产生富氢流，并将其送入燃气轮机。CaO被用作吸附剂，以提高氢气的产生和二氧化碳的捕获。CaO的再生是通过在再生容器中煅烧完成的。利用Aspen Plus软件对具有CaO吸附增强过程的IGCC进行了建模和仿真。壳牌和德士古两种商业化的气化技术与吸附强化工艺相结合。结果表明，IGCC - CaO吸附强化工艺具有令人满意的体系性能。虽然净电力效率没有预想的那么高，只有30-33%左右，但该系统具有高达97%的二氧化碳捕获效率和低污染物排放。此外，与传统的IGCC-CCS相比，IGCC-CCS过程的原理图得到了简化。在敏感分析中对影响装置性能的参数进行了分析，包括wgs -吸收器温度、H2O/CO比、压力等。讨论了该系统面临的一些挑战。
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 CO2emission. In this paper, the CaO sorption-enhanced process is incorporated downstream with coal gasification to produce a hydrogen-rich stream for electricity production and CO2separation. 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 CO2capture. 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 CO2capture efficiency ∼97% 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.