橇装式LNG加气机加气系统及计量系统的优化设计

An optimal design of gas refueling and metering systems for a skid-mounted LNG station

针对目前橇装式LNG汽车加气站加气时LNG损失量大和计量不准的问题,对LNG加气站的加气系统和计量系统进行了优化设计:加气机设有加气枪接口、加气枪回流接口和回气枪接口,按照"LNG损失量最小"的设计理念,分别设计了待机模式、加注模式下的加气操作流程;应用双流量计计量法设计了加气计量系统,并用质量检定法验证了该系统的精度。试验验证结果表明:该橇装式LNG汽车加气站加气系统运行稳定,计量误差小于1%,能满足计量要求,可在实际工程中推广应用。

A heavy loss and inaccuracy in metering often occur when vehicles are refueled at the skid-mounted LNG stations.In view of this,an optimal design is made of the refueling and metering systems for a LNG fueling station.First,the fittings and reflow joints of gas guns,and joints of return gas guns are designed in the gas dispenser.Then,according to the concept of the minimum LNG loss,the standby mode and the refueling mode are respectively designed for the gas fueling process.Finally,the gas refueling metering system is designed by use of the dual-metering method,and its accuracy is verified by the quality detection method.Pilot tests show that this developed gas refueling system is under steady operation in the skid-mounted LNG gas fueling stations,and the metering error is less than 1%,which means that it will be popularly applied in actual uses.