Optimization of the design, operating conditions, and coupling configuration of combined cycle power plants and CO2 capture processes by minimizing the mitigation cost
Optimization of the design, operating conditions, and coupling configuration of combined cycle power plants and CO2 capture processes by minimizing the mitigation cost
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DOI：
10.1016/j.cej.2017.08.111
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发表时间：
2018
影响因子：
15.1
通讯作者：
P. Mores;Juan I. Manassaldi;N. Scenna;J. Caballero;M. Mussati;Sergio F. Mussati
中科院分区：
文献类型：
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作者：
P. Mores;Juan I. Manassaldi;N. Scenna;J. Caballero;M. Mussati;Sergio F. Mussati
在满足发电容量和CO2捕集水平的设计指标下，通过最小化减排成本（发电成本与单位净发电量CO2排放量之比）来优化天然气联合循环（NGCC）电厂和燃烧后CO2捕集过程之间的耦合。使用NGCC和CO2捕获工厂的详细且严格的模型对三种候选耦合配置进行了优化，这些配置在蒸汽提取位置上有所不同。通过比较每种配置的缓解成本，提供了最佳集成配置以及所有工艺单元（蒸汽涡轮机、燃气涡轮机、余热锅炉、吸收和再生塔、再沸器和冷凝器以及泵）的相应最佳尺寸和操作条件。在计算的最优解中，CO2捕集装置所需的蒸汽从蒸汽涡轮机和HRSG（在低压下操作的蒸发器）提取，并且缓解成本为90.88 $/t CO2。最优解与对应于其他两个候选耦合方案的次优解进行比较。这些解决方案进行了详细的比较，资本投资和运行成本，余热锅炉配置，工艺单元的大小，和操作条件。
This paper deals with the optimization of the coupling between a natural gas combined cycle (NGCC) plant and a post-combustion CO2capture process by minimizing the mitigation cost – defined as the ratio between the cost of electric power generation and the amount of CO2emitted per unit of total net electric power generated – while satisfying the design specifications: electric power generation capacity and CO2capture level. Three candidate coupling configurations, which differ in the place where the steam is extracted from, are optimized using detailed and rigorous models for both the NGCC and the CO2capture plants. By comparing the mitigation cost of each configuration, the optimal integration configuration and the corresponding optimal sizes and operating conditions of all process units (steam turbines, gas turbines, heat recovery steam generators HRSGs, absorption and regeneration columns, reboilers and condensers, and pumps) are provided. In the computed optimal solution, the steam required by the CO2capture plant is extracted from both the steam turbine and the HRSG (evaporator operating at low pressure), and the mitigation cost is 90.88 $/t CO2. The optimal solution is compared with suboptimal solutions corresponding to the other two candidate coupling schemes. These solutions are compared in detail regarding capital investment and operating costs, HRSG configuration, process unit sizes, and operating conditions.