地下储气库天然气液化法注气工艺原理探讨  

Discussion on gas injection process principle of natural gas liquefaction method for underground gas storage

作　　者：周刚[1] ZHOU Gang(Gas Storage Management of Huabei Petroleum Administration Co.,Ltd.,Langfang 065000,China)

机构地区：[1]华北石油管理局有限公司储气库管理处,河北廊坊065000

出　　处：《石油工程建设》2021年第1期1-3,9,共4页Petroleum Engineering Construction

摘　　要：传统天然气地下储气库注气压缩机投资大,运行成本高。探索一种新的储气库运行方式,具体方法是将进站天然气与出站天然气进行热交换降温,然后进入浅冷和深冷系统冷却,直到把全部天然气液化进入高压LNG储罐,再将液化天然气与进站天然气换热加温,梯次升温气化增压,达到注气压力后注入地下储气库,即将现行注气系统中的对天然气强制加压方法改变为升温升压方法。在采气期,利用注气装置的前半部分设备进行采气生产,提高了注采气站的设备利用率。此方法有效降低了地下储气库注采气站的投资和运行成本。The traditional gas injection compressor for underground gas storage has large investment and high operating cost.A new operation mode of gas storage is explored.The concrete method is to reduce the temperature of the natural gas entering the station by heat exchange with the natural gas exiting the station,then let the gas enter the shallow and cryogenic cooling system for cooling until all natural gas is liquefied and goes into the high pressure LNG storage tank,after that,increasing the temperature of the liquefied natural gas by heat exchange with the natural gas entering the station,stepwise increasing the temperature until the gas gasifying and pressure rising to the injection pressure,then the gas is injected into the underground gas storage.Therefore,the forced pressurization method currently used in the gas injection system is changed to the heating and pressurization method.In the gas production period,the first half injection equipment is used for gas production,and the equipment utilization ratio of the gas injection station is improved.This method effectively reduces the investment and operation cost of the gas injection and production station of the underground gas storage.

关 键 词：地下储气库 液化 等压降温过程 升温升压过程 

分 类 号：TE972.2[石油与天然气工程—石油机械设备]