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首页> 外文会议>CO2 summit III: pathways to carbon capture, utilization, and storage deployment >DESIGN AND OPERATIONS OPTIMIZATION OF MEMBRANE SEPARATION FOR FLEXIBLE CARBON CAPTURE FROM NATURAL GAS COMBINED CYCLE SYSTEMS
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DESIGN AND OPERATIONS OPTIMIZATION OF MEMBRANE SEPARATION FOR FLEXIBLE CARBON CAPTURE FROM NATURAL GAS COMBINED CYCLE SYSTEMS

机译：天然气联合循环系统灵活捕集碳膜的设计与操作优化

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We explore the concept of flexible carbon capture using membrane separation. Flexible carbon capture has been studied in recent years as a measure to decarbonize fossil-fired power generation in response to electricity market conditions, including varying electricity prices and/or fluctuating electricity supply requirements. The importance of flexible operation of carbon capture systems is highlighted by the increasing penetration of intermittent energy generation from renewable sources such as wind and solar PV. To accommodate the integration of renewable energy into the grid, fossil-fired power plants would need to generate varying electricity load, producing flue gas with varying characteristics and at varying volumes. Carbon capture systems in a high-renewables grid will be required to operate flexibly to respond to these changes. Flexible carbon capture has been studied for amine absorption,12 a leading CCS technology. This work explores the possibility of flexible carbon capture using membrane separation, a promising alternative to amine absorption. In particular, membranes are considered to be very responsive to system changes and require very short start-up times.3 In addition, membrane separation has advantages such as having a smaller footprint, being more environmentally benign (no corrosive chemicals involved in the separation process), and potentially incurring lower separation energy. In this work, we perform optimization to determine the optimal process design and time-varying operations of a polymeric membrane system separating CO_2 from a natural gas combined cycle (NGCC) with wind energy integration. The total net present value (NPV) of the gas turbines and membrane system is maximized. Both design and operations of the capture plant are optimized. Design decision variables include membrane process configuration, membrane size, CO_2/N2 selectivity and CO_2 permeance (two key membrane properties relevant to separation performance), and compressor and vacuum pump sizes. These parameters are determined before a capture unit is built. After the plant is built, operational decision variables include gas flowrates, the pressure ratio across the membrane and permeate-side (low-pressure side) pressure. These are parameters that can be adjusted, within limits, given electricity market conditions for a given time period. Time-varying electricity output from gas turbines as well as the associated flue gas flowrate and composition will be determined by HyPPO, an in-house software developed at Stanford University for modeling and optimization of flexible and renewable-integrated power systems. HyPPO models beneficial operating strategies for a set of statistically representative days. HyPPO results will be used with membrane separation models for various process configurations as modeled in MATLAB.
机译：我们探索了使用膜分离进行柔性碳捕集的概念。近年来，已经进行了灵活的碳捕集研究，作为一种针对化石燃料发电进行脱碳的措施，以应对电力市场状况，包括变化的电价和/或波动的供电需求。越来越多的可再生能源（例如风能和太阳能PV）产生的间歇性能源的渗透，突显了碳捕集系统灵活运行的重要性。为了将可再生能源整合到电网中，化石燃料发电厂将需要产生不同的电力负荷，产生具有不同特性和不同体积的烟气。高可再生能源电网中的碳捕集系统将需要灵活运行以应对这些变化。领先的CCS技术已经研究了灵活的碳捕集以吸收胺12。这项工作探索了使用膜分离（一种有希望的胺吸收替代方法）进行灵活的碳捕集的可能性。尤其是，膜被认为对系统变化非常敏感，并且需要非常短的启动时间。3此外，膜分离还具有以下优点：占地面积小，对环境无害（分离过程中不涉及腐蚀性化学物质） ），并可能产生较低的分离能。在这项工作中，我们进行优化，以确定将CO_2与具有风能集成的天然气联合循环（NGCC）分离的聚合物膜系统的最佳工艺设计和时变操作。燃气轮机和膜系统的总净现值（NPV）最大化。捕集设备的设计和操作均已优化。设计决策变量包括膜工艺配置，膜尺寸，CO_2 / N2选择性和CO_2渗透率（与分离性能相关的两个关键膜特性）以及压缩机和真空泵的尺寸。这些参数是在构建捕获单元之前确定的。工厂建成后，操作决策变量包括气体流量，跨膜的压力比和渗透侧（低压侧）压力。这些参数可以在给定的时间段内，在给定的电力市场条件下，在限制范围内进行调整。燃气轮机的时变电力输出以及相关的烟道气流量和组成将由HyPPO确定，HyPPO是斯坦福大学开发的内部软件，用于建模和优化灵活的可再生集成电源系统。 HyPPO在一组统计上具有代表性的日子里为有益的运营策略建模。 HyPPO结果将与膜分离模型一起用于MATLAB中建模的各种过程配置。

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