Mukherjee Sanjay, Kumar Prashant, Hosseini Ali, Yang Aidong, Fennell Paul
Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences (FEPS), University of Surrey , Guildford, Surrey GU2 7XH, United Kingdom.
Sharif Energy Research Institute (SERI), Sharif University of Technology , Tehran, Iran.
Energy Fuels. 2014 Feb 20;28(2):1028-1040. doi: 10.1021/ef4024299. Epub 2014 Jan 21.
Seven different types of gasification-based coal conversion processes for producing mainly electricity and in some cases hydrogen (H), with and without carbon dioxide (CO) capture, were compared on a consistent basis through simulation studies. The flowsheet for each process was developed in a chemical process simulation tool "Aspen Plus". The pressure swing adsorption (PSA), physical absorption (Selexol), and chemical looping combustion (CLC) technologies were separately analyzed for processes with CO capture. The performances of the above three capture technologies were compared with respect to energetic and exergetic efficiencies, and the level of CO emission. The effect of air separation unit (ASU) and gas turbine (GT) integration on the power output of all the CO capture cases is assessed. Sensitivity analysis was carried out for the CLC process (electricity-only case) to examine the effect of temperature and water-cooling of the air reactor on the overall efficiency of the process. The results show that, when only electricity production in considered, the case using CLC technology has an electrical efficiency 1.3% and 2.3% higher than the PSA and Selexol based cases, respectively. The CLC based process achieves an overall CO capture efficiency of 99.9% in contrast to 89.9% for PSA and 93.5% for Selexol based processes. The overall efficiency of the CLC case for combined electricity and H production is marginally higher (by 0.3%) than Selexol and lower (by 0.6%) than PSA cases. The integration between the ASU and GT units benefits all three technologies in terms of electrical efficiency. Furthermore, our results suggest that it is favorable to operate the air reactor of the CLC process at higher temperatures with excess air supply in order to achieve higher power efficiency.
通过模拟研究，在一致的基础上比较了七种不同类型的基于气化的煤炭转化工艺，这些工艺主要用于发电，在某些情况下还用于生产氢气（H），有的具备二氧化碳（CO）捕集功能，有的则没有。每个工艺的流程图是在化学过程模拟工具“Aspen Plus”中开发的。对于具有CO捕集功能的工艺，分别分析了变压吸附（PSA）、物理吸收（Selexol）和化学链燃烧（CLC）技术。从能量效率和火用效率以及CO排放水平方面，对上述三种捕集技术的性能进行了比较。评估了空气分离单元（ASU）和燃气轮机（GT）集成对所有CO捕集案例的功率输出的影响。对CLC工艺（仅发电案例）进行了敏感性分析，以研究空气反应器的温度和水冷对该工艺整体效率的影响。结果表明，仅考虑发电时，使用CLC技术的案例的电效率分别比基于PSA和Selexol的案例高1.3%和2.3%。基于CLC的工艺实现了99.9%的整体CO捕集效率，相比之下，基于PSA的工艺为89.9%，基于Selexol的工艺为93.5%。用于联合发电和制氢的CLC案例的整体效率略高于Selexol案例（高0.3%），低于PSA案例（低0.6%）。ASU和GT单元之间的集成在电效率方面使所有三种技术都受益。此外，我们的结果表明，为了实现更高的功率效率，在过量空气供应的情况下，以较高温度运行CLC工艺的空气反应器是有利的。
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