Natural gas power plants integrated with a carbon capture process, have recently attracted a lot of attention due to their capability of synergizing with renewable technologies and decarbonization of the power industry. The natural gas plant is fueled by liquefied natural gas at extremely low temperatures and is subsequently regasified. During regasification, a substantial amount of cold energy is available which is conventionally wasted. Furthermore, the integration of the carbon capture process poses a significant energy penalty on the system. This study, therefore, investigated the optimal utilization of the cold energy of the liquefied natural gas and the configuration of the post-combustion carbon dioxide capture process for the natural gas plant. Firstly, the carbon dioxide capture process was modified to reduce its thermal energy requirement. Secondly, the application of liquefied natural gas as a heat sink for the organic Rankine cycle was investigated. Subsequently, an alternative application of liquefied natural gas cold energy in the carbon dioxide compression process was evaluated. The results show that the modified carbon dioxide capture process reduces the thermal energy requirement by 12.8% and improves the efficiency of the power plant by 0.6%. The optimized organic Rankine cycle generates 4.9 MW electrical power using cold energy. In comparison, the intensified compression process integrated with liquefied natural gas regasification reduces the compression power by 7.15 MW, outperforming the application of liquefied natural gas in power generation. Thus, the optimal utilization of liquefied natural gas cold energy is in the carbon dioxide compression process as it improves the net efficiency and reduces the footprint of the liquefied natural gas cold energy utilization process. The modified carbon dioxide capture process and intensified carbon dioxide compression process using liquefied natural gas cold energy can enhance power generation by 13 MW and reduce the efficiency penalty from 6.1% to 4.8%.

天然气发电厂与碳捕获过程相结合，由于其与可再生技术和电力行业脱碳的协同能力，最近引起了很多关注。天然气厂以极低温度的液化天然气为燃料，然后再气化。在再气化过程中，可以使用大量的冷能，而这些冷能通常会被浪费掉。此外，碳捕获过程的集成对系统造成了显着的能量损失。因此，本研究调查了液化天然气冷能的最佳利用以及天然气厂燃烧后二氧化碳捕获过程的配置。首先，对二氧化碳捕获过程进行了修改，以减少其热能需求。其次，研究了液化天然气作为有机朗肯循环热沉的应用。随后，对液化天然气冷能在二氧化碳压缩过程中的替代应用进行了评估。结果表明，改进后的二氧化碳捕集工艺使热能需求降低了12.8%，电厂效率提高了0.6%。优化的有机朗肯循环使用冷能产生 4.9 MW 电力。相比之下，与液化天然气再气化相结合的强化压缩工艺降低了7.15 MW的压缩功率，优于液化天然气在发电中的应用。因此，液化天然气冷能的最佳利用是在二氧化碳压缩过程中，因为它提高了净效率并减少了液化天然气冷能利用过程的足迹。改进后的二氧化碳捕集工艺和使用液化天然气冷能的强化二氧化碳压缩工艺可将发电量提高 13 MW，并将效率损失从 6.1% 降低到 4.8%。