城市门站天然气降压冷能回收利用探讨

Discussion of Natural-gas Decompression and Cold-energy Recovery/Utilization in City Gas Gate Station

长距离高压管输天然气在进入城市燃气输配管网前需经门站处节流降压,在此过程中会产生大量宝贵的工艺冷能。对这部分潜在能源进行回收利用,将收到巨大的经济和社会效益。从冷能的综合、有效利用出发,提出了针对天然气降压产生的冷能进行利用的多重联合循环方案和空气分离方案,并对流程进行优化,以实现按质用能、能尽其用的目的。

Natural gas through long-distance high-pressure pipeline needs throttle and decompression before entering into urban gas transmission and distribution network.Simultaneously,amount of precious cold energy may be produced during throttle and decompression.Great economic and social benefits should be obtained if recovering cold energy.Two schemes of combined cycle and air separation for cold-energy utilization are presented in terms of the comprehensive and effective utilization,and their procedures are optimized to make a full use of the energy.