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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >A NGCC power plant with a CO2 post-combustion capture option. Optimal economics for different generation/capture goals
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A NGCC power plant with a CO2 post-combustion capture option. Optimal economics for different generation/capture goals

机译：NGCC电厂二氧化碳燃烧后捕获选项。代/捕获目标

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摘要

Fossil fuel power plants are one of the major sources of electricity generation, although invariably release greenhouse gases. Due to international treaties and countries regulations, CO2 emissions reduction is increasingly becoming key in the generators' economics. NGCC power plants constitute a widely used generation technology, from which CO2 capture through a post-combustion and MEA absorption option constitutes a technological challenge due to the low concentration of pollutants in the flue gas and the high energy requirements of the sequestration process. In the present work, a rigorous optimization model is developed to address the design and operation of power plants coupled to capture systems. The equations-oriented modeling strategy here utilized can address greenfield designs in which design and operating variables are simultaneously optimized, in order to ensure that the system will be able to meet process requirements at minimum cost. Then, an analysis of the electricity cost, CO2 avoidance cost, energy penalties, as well as the optimal values of decision variables is thoroughly pursued. Different economic tradeoffs are comprised at the optimal solutions for the joint project, as given by the different discrete and continuous decisions that the designer needs to weight in order to achieve the desired generation and capture goals, including the number of parallel capture trains, the inherent efficiency of each recovery unit, and the overall emissions reduction rate. In this context, the joint optimization of the NGCC power plant with the amine-based capture option results in a novel configuration where 731MW are optimally generated for supplying both the external demand and the capture plant energy requirements, and achieving an overall CO2 emissions reduction rate of 82.1% by means of a three capture trains arrangement, where 13.4% of the flue gas stream is bypassed and 94.8% of the CO2 gets recovered at each unit. This new generation/capture project features optimal values of its economic performance indicators, with an avoidance cost of 81.7 US$ per tonne of CO2 captured, which can only be secured by simultaneously optimizing the design and operating variables of both systems on a start-of-the-art optimization algorithm.
机译：化石燃料发电厂是主要之一发电来源,虽然总是释放温室气体。国际条约和国家法规,二氧化碳减排日益成为键生成器的经济学。植物是广泛使用的一代技术、二氧化碳捕获通过燃烧后,意味着吸收选项由于构成技术挑战低浓度烟气中的污染物和高能源的要求封存过程。严格的优化模型解决电厂的设计和操作捕获系统的耦合。equations-oriented建模策略利用可以解决绿地设计中同时设计和操作变量优化,以确保系统能够满足过程要求最低成本。电力成本,避免二氧化碳成本、能源的处罚,以及最优值决策变量是彻底的追求。是由不同的经济的权衡最优解的联合项目,由不同的离散和连续设计师需要重量的决定以达到所需的生成和捕捉目标,包括平行的数量每个捕获火车,固有的效率回收装置,整体排放降低利率。优化的NGCC电厂在一本小说amine-based捕获选项结果配置优化生成的731兆瓦外部需求和供应获取植物能源需求和实现一个总体二氧化碳减排率为82.1%通过三个捕捉火车安排,13.4%的废气流绕过在哪里和94.8%的二氧化碳会在每个单元中恢复过来。新一代/捕获项目特性其经济表现的最优值指标,避免成本为81.7美元每吨二氧化碳捕获,这只能同时获得的优化设计和操作变量的两个系统start-of-the-art优化算法。

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