氢气和天然气联合液化工艺设计与优化

Design and optimization of combined hydrogen and natural gas liquefaction process

为提高氢液化工艺的性能,通过整合天然气双混合制冷剂(DMR)工艺和氢克劳德循环,提出一种新型的氢气和天然气联合液化工艺,其适用于回收工业副产氢等联合生产液氢(LH_(2))和液化天然气(LNG),具有能耗低、效率高,以及调节灵活的特点。使用HYSYS模拟工艺,并借助粒子群优化(PSO)算法找到使工艺比能耗(SEC)最低的工艺参数。结果表明,联合液化工艺的SEC为6.6150 kWh/kg_(LH2)-kg_(LNG),生产LNG和LH_(2)的SEC分别为0.2143 kWh/kg_(LNG)和6.4007 kWh/kg_(LH2)。[火用]分析表明,工艺的总[火用]损失为38735 kW,[火用]效率为41.54%。设计的联合液化工艺实现能量的综合利用,不仅在以工业副产品为原料联合生产LH_(2)和LNG的工厂建设中应用前景广阔,而且对于纯氢液化工艺的设计也具有参考价值。

To improve the performance of hydrogen liquefaction process,a new combined hydrogen and natural gas liquefaction process was proposed by integrating natural gas dual mixed refrigerant(DMR)process and hydrogen Claude cycle,which is suitable for the combined production of liquid hydrogen(LH_(2))and liquefied natural gas(LNG),such as recycling industrial by-product hydrogen,with low energy consumption,high efficiency and flexible regulation.The process was simulated using HYSYS and the particle swarm optimization(PSO)algorithm was used to find the process parameters that resulted in the lowest process specific energy consumption(SEC).The results show that the total SEC of the combined liquefaction process is 6.6150 kWh/kg-kg,and the SEC of producing LNG and LH_(2)is 0.2143 kWh/kgand 6.4007 kWh/kg,respectively.The exergy analysis shows that the total exergy loss of the process is 38735 kW and the exergy efficiency is 41.54%.The combined liquefaction process designed in this paper realizes comprehensive utilization of energy,which is not only promising in the construction of plants for combined production of LH_(2)and LNG from industrial by-products,but also has reference value for the design of pure hydrogen liquefaction process.