Techno-economic process design of a commercial-scale amine-based CO2 capture system for natural gas combined cycle power plant with exhaust gas recirculation
Techno-economic process design of a commercial-scale amine-based CO2 capture system for natural gas combined cycle power plant with exhaust gas recirculation
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DOI：
10.1016/j.applthermaleng.2016.04.145
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发表时间：
2016-06-25
影响因子：
6.4
通讯作者：
Pourkashanian, Mohamed
中科院分区：
文献类型：
--
作者：
Ali, Usman;Agbonghae, Elvis O.;Pourkashanian, Mohamed
燃烧后二氧化碳捕获系统作为一种减少不断上升的温室气体排放的手段正变得越来越重要。此外，对于天然气发电系统，废气再循环是提高稀薄烟气中二氧化碳浓度的一种方法。本研究报告了四种不同情况的基于胺的二氧化碳捕获系统的设计和放大，该系统的捕获率为90%，MEA水溶液的捕获率为30wt.%。给出了一个总功率为650MWe的天然气联合循环系统的设计结果，该系统不含废气再循环，废气再循环率分别为20%、35%和50%。结合工艺和经济分析，确定了不同胺基二氧化碳捕集装置的最佳设计。对于不含废气再循环的天然气联合循环的胺基二氧化碳捕集装置，最佳液气比为0.96。当EGR为20%、35%和50%时，最佳液气比分别为1.22、1.46和1.90。这些结果表明，具有废气再循环的天然气发电厂将在基于胺的二氧化碳捕集工厂的能源消耗和成本方面产生较低的惩罚。(C)2016爱思唯尔有限公司。保留所有权利。
Post-combustion CO2 capture systems are gaining more importance as a means of reducing escalating greenhouse gas emissions. Moreover, for natural gas-fired power generation systems, exhaust gas recirculation is a method of enhancing the CO2 concentration in the lean flue gas. The present study reports the design and scale-up of four different cases of an amine-based CO2 capture system at 90% capture rate with 30 wt.% aqueous solution of MEA. The design results are reported for a natural gas-fired combined cycle system with a gross power output of 650 MWe without EGR and with EGR at 20%, 35% and 50% EGR percentage. A combined process and economic analysis is implemented to identify the optimum designs for the different amine-based CO2 capture plants. For an amine-based CO2 capture plant with a natural gas-fired combined cycle without EGR, an optimum liquid to gas ratio of 0.96 is estimated. Incorporating EGR at 20%, 35% and 50%, results in optimum liquid to gas ratios of 1.22, 1.46 and 1.90, respectively. These results suggest that a natural gas-fired power plant with exhaust gas recirculation will result in lower penalties in terms of the energy consumption and costs incurred on the amine-based CO2 capture plant. (C) 2016 Elsevier Ltd. All rights reserved.