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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Systematic Design and Optimization of a Membrane-Cryogenic Hybrid System for CO2 Capture
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Systematic Design and Optimization of a Membrane-Cryogenic Hybrid System for CO2 Capture

机译：二氧化碳捕获膜低温混合系统的系统设计与优化

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CO2 capture is a promising way of offloading the impact of fossil fuels on global warming. Although various techniques have been proposed for CO2 capture, the main obstacle remains the economic performance. This paper focuses on designing a novel CO2 capture process, the hybrid membrane-cryogenic system, and optimizing its economic performance. The optimization of such a hybrid separation system involves synthesis of separation sequences, design of heat exchanger networks, and optimization of compression/expansion networks. Each of the subsystems is a complex system, and there are tight interactions between the subsystems. Therefore, it is challenging to synthesize these subsystems. To optimize this complex hybrid carbon capture process, a novel two-step approach is proposed. The separation sequence, as well as energy consumption, is optimized first. Then, the remaining heat exchanger network is synthesized with flowsheet optimization simultaneously. An iterative procedure is proposed to build a solution pool, which serves as a bridge between the two steps. In addition, a discrete cutting method and a piecewise approximation approach are introduced to improve the reliability and validity of the two-step model. Case studies show that the optimized hybrid system can improve the economic performance for both precombustion and postcombustion carbon capture cases. It is especially suitable for precombustion CO2 capture, where 33% of operating cost reduction and 28% total annualized cost reduction are achieved.
机译：二氧化碳捕获是卸载化石燃料对全球变暖的影响的有希望的方式。虽然已经提出了各种技术的二氧化碳捕获，但主要障碍仍然是经济表现。本文侧重于设计新型二氧化碳捕获过程，混合膜 - 低温系统，优化其经济性能。这种混合分离系统的优化涉及合成分离序列，热交换器网络的设计，以及压缩/扩展网络的优化。每个子系统都是复杂的系统，并且子系统之间存在紧密的相互作用。因此，合成这些子系统是挑战性的。为了优化这种复杂的混合碳捕获过程，提出了一种新的两步方法。首先优化分离序列以及能量消耗。然后，剩余的热交换器网络同时使用流量优化合成。建议一个迭代程序来构建解决方案池，该池用作两步之间的桥梁。另外，引入了离散的切割方法和分段近似方法，以提高两步模型的可靠性和有效性。案例研究表明，优化的混合动力车系统可以提高预清除碳捕集病例的经济性能。它特别适用于预核化二氧化碳捕获，其中33％的运营成本降低和28％的年化成本降低。

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