LNG储罐优化数学模型及其应用

在LNG系统中，LNG储罐设施所占的投资比例较大，为节省投资，基于压力和蒸发率的关系对LNG储罐进行优化。相对于LNG单容罐，全容罐在经济和安全方面的优势更明显。介绍了LNG全容罐保温系统的组成和优化原理，提出通过调整保温层厚度代替储罐的增压系统进行罐内压力调节并达到高压储存的目的，在储罐安全的条件下，利用BOG压缩机对蒸发气进行再冷凝，实现LNG的循环利用。基于此，建立了LNG储罐优化数学模型，并利用VC＋＋语言编写计算程序对其求解，算例分析结果表明：该模型可行且适用于LNG系统的优化。

Mathematical model for optimization of LNG storage tank and its application

In LNG systems,LNG storage tank facilities make up a large proportion of investment.In order to save investments,LNG storage tank can be optimized based on the relationship between pressure and evaporation rate.Compared with single-capacity tank of LNG,full-capacity tank of LNG provides more economic and safety advantages.Structure of insulation system of full-capacity LNG tank and its optimization principle are described.The author considers that it is necessary to change tank pressure and store gas under high-pressure by adjusting the thickness of insulating layer instead of boosting system of tank,and recondensate the BOG with compressor to recycling LNG under safe running of tank.So an optimized mathematical model for LNG tank is built and VC++ language is used to write a calculation program for the solution.Case analysis shows that the model is available to reasonable optimization and use for LNG system.