利用分输站的压差液化天然气研究

Study on liquefying natural gas using differential pressure of gas-distributing station

关键词:  分输站  压力能  净化  压差式液化  液化天然气 

Key words:  gas-distributing station  pressure energy  purification  pressure differential liquefaction  liquefied natural gas

摘要:

基于天然气长输管线分输站蕴含着巨大的可利用的压力能,提出利用分输站压差液化天然气的工艺。液化工艺中,管输天然气净化采用MDEA(35%)+DEA(5%)的混合胺液脱碳脱硫, 4A分子筛脱水；液化采用透平膨胀机制冷。同时,研究了分输站压差、分输量对天然气液化率的影响。该工艺适用于长输管线压降大、分输规模较大的分输站。 

Abstract:

There is huge available pressure energy in the gas-distributing station of the long-distance pipeline of natural gas, so the process of using differential pressure of gas-distributing station to liquefy natural gas were put forward. In the liquefaction technology, mixed amine solution of MDEA (35 wt%)+DEA (5 wt%) was used to remove CO₂ and H₂S, 4A molecular sieve was used to remove water, and turbine expander was used to liquefy natural gas. At the same time, the impacts of differential pressure and distribution throughput on liquefaction rate were analyzed. The results show that the process is suitable for the gas-distributing station of high pressure drop and large distribution throughput.