The comparative performance study is carried out for 500 MW Supercritical (SupC) Oxy-Coal Combustion (OCC) and Air-Coal Combustion (ACC) power plants with membrane-based CO2 capture at the fixed furnace temperature. The proposed configurations are modelled using a computer-based analysis software 'Cycle-Tempo' at different operating conditions, and the detailed thermodynamic study is done by considering Energy, Exergy, and Environmental (3-E) analysis. The result shows that the net energy and exergy efficiencies of ACC power plants with CO2 capture are about 35.07 % and 30.88 %, respectively, which are about 6.44 % and 5.77 % points, respectively higher than that of OCC power plant. Auxiliary power consumption of OCC based power plant is almost 1.97 times more than that of the ACC based plant due to huge energy utilization in the Air Separation Unit (ASU) of OCC plant which leads to performance reduction in OCC plant. However, environmental benefit of OCC based power plant is more than that of ACC based power plant with respect to CO2 emission. OCC plant emits about 0.164 kg/kWh of CO2 which is approximately 16.75 times lower than the CO2 emission in ACC based power plant. It is also analyzed that the performance of the CO2 Capture Unit (CCU) for the OCC based plant is about 3.65 times higher than the ACC based power plant due to higher concentration of CO2 (nearly 80.63%) in the flue gas emitting from OCC plant. The study also reveals that the auxiliary power consumption per kg of CO2 capture of the OCC based plant is about 0.142 kWh/kg, which is approximately 0.06 times lower than the ACC based plant. The higher performance of the OCC based power plant is found at lower value of flue gas recirculation due to the fact that reduction in exergy destruction at the mixing zone of the combustor is higher than the increase in exergy destruction of the heat exchangers at higher furnace exit temperature. But the metallurgical temperature limit of boiler tube materials restricts the use of the higher value of furnace temperature. OCC based power plant with CO2 capture can be preferred over ACC based plant with CO2 capture due to higher environmental benefits towards mitigating CO2, the key greenhouse gas on earth in spite of exhibiting lesser energy and exergy efficiencies. KeywordsAir-coal combustion, CO2 capture, Oxy-coal combustion, Supercritical, Power plant. International Journal of Mathematical, Engineering and Management Sciences Vol. 5, No. 4, 652-662, 2020 https://doi.org/10.33889/IJMEMS.2020.5.4.053 653

中文翻译：

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含CO2捕集的500 MWe超临界蒸汽发电厂的含氧煤和空煤燃烧的3-E（能源，火用和环境）比较分析

这项比较性能研究针对的是500 MW超临界（SupC）氧煤燃烧（OCC）和空燃煤（ACC）发电厂，它们在固定的炉温下捕获基于膜的CO2。使用基于计算机的分析软件“ Cycle-Tempo”在不同的运行条件下对拟议的配置进行建模，并通过考虑能源，火用和环境（3-E）分析来完成详细的热力学研究。结果表明，ACC电厂CO2捕集的净能和火用效率分别为约35.07％和30.88％，分别比OCC电厂高约6.44％和5.77％。基于OCC的发电厂的辅助功耗几乎为1。由于OCC工厂的空分装置（ASU）大量利用能源，导致OCC工厂的性能下降，因此它是基于ACC的工厂的97倍。但是，就CO2排放而言，基于OCC的发电厂的环境效益要比基于ACC的发电厂的环境效益更大。OCC电厂排放的CO2约为0.164 kg / kWh，比ACC电厂的CO2排放低约16.75倍。还分析了基于OCC的电厂的CO2捕集单元（CCU）的性能是基于ACC的电厂的约3.65倍，这是因为从OCC电厂排放的烟气中的CO2浓度较高（近80.63％） 。该研究还表明，基于OCC的工厂每千克CO2捕集的辅助功耗约为0.142 kWh / kg，约为0。比基于ACC的工厂低06倍。基于OCC的发电厂的更高性能被认为是烟气再循环的价值较低，这是由于以下事实：燃烧室混合区的火用破坏减少量高于高炉出口处的热交换器的火用破坏量增加量。温度。但是锅炉管材料的冶金温度极限限制了炉温较高值的使用。具有O2捕获能力的OCC电厂比具有ACO捕获能力的ACC电厂更可取，这是因为尽管降低了能源和火用效率，但对减轻CO2的排放具有更高的环境效益，CO2是地球上的主要温室气体。关键字：空煤燃烧，CO2捕集，富氧煤燃烧，超临界，电厂。国际数学杂志，工程与管理科学卷 2020年第5卷第4期652-662 https://doi.org/10.33889/IJMEMS.2020.5.4.053 653