LNG接收站蒸发气量计算方法

Calculation method of evaporating volume for LNG receiving station

采用LNG接收站蒸发气量单元计算方法,将LNG接收站再冷凝工艺流程划分为储罐蒸发、管道吸热、储罐闪蒸、大气压变化、泵做功等11个基本流程单元,结合珠海LNG接收站一期的设计方案,进行了各个流程单元的蒸发气量计算。比较各个单元的蒸发气量计算结果,得出结论:卸料置换单元产生的蒸发气量和返回LNG船的蒸发气量较大,二者与LNG船的尺寸密切相关,是蒸发气量计算的关键参数;大气变化亦对蒸发气量产生较大影响,在设计过程中应充分考虑气候因素。该方法使LNG接收站设计考虑的因素更加全面,且站内与蒸发气量相关的所有设备和管路均可基于单个或组合单元的计算结果进行选型,因此亦使设计更加灵活高效。

By means of the unit calculation method of evaporating volume for LNG receiving station,the re-condensation technological process of LNG receiving station is divided into 11 primary technology units such as tank evaporation,pipeline decalescence, tank flash vaporization,atmospheric pressure change,working of pump,etc.. Evaporating volume in each technology unit is calculated based on the first-period design scheme of Zhuhai LNG Receiving Station. Through comparing the computational results of evaporating volume in each technology unit,it could be concluded that evaporating volume produced in unloading displacement unit and returning LNG ship unit are more than that of other units,and both of them are closely related to the LNG ship's size,which are the key parameters to calculate the evaporating volume. Atmospheric pressure change is also an important parameter,so the climate factors should adequately be considered in the design. This method makes the factors considered in design of LNG receiving station more perfect,and all equipments and pipes related to evaporating volume in the station could be selected on basis of computational results for a single unit or combination units. Therefore,the design is more flexible and effective.