甲醇供给系统氮气吹扫过程的数值研究  

A Numerical Study on Nitrogen Purging Process in Methanol Supply System

作　　者：顾辰辰 张富毅 钱正华 马宁 杨鹏 GU Chenchen;ZHANG Fuyi;QIAN Zhenghua;MA Ning;YANG Peng(Shanghai Marine Diesel Engine Research Institute,Shanghai 200090,China;National Engineering Laboratory for Marine and Ocean Engineering Power System,Shanghai 200090,China)

机构地区：[1]上海船用柴油机研究所,上海200090 [2]船舶与海洋工程动力系统国家工程实验室,上海200090

出　　处：《船舶与海洋工程》2023年第6期35-39,共5页Naval Architecture and Ocean Engineering

基　　金：上海船用柴油机研究所所发基金项目(Z2019Z2-012/002)。

摘　　要：氮气吹扫是甲醇供给系统工作流程中的重要环节,为探究不同氮气压力条件下的氮气吹扫时间(即排净时间)和氮气消耗量,结合均相流模型、标准k-ε湍流模型和VOF(Volume Of Fluid)多相流模型对0.7 MPa、0.9 MPa和1.1 MPa等3种氮气压力工况进行数值研究。通过计算稳态氮气单相工况验证网格无关性,确定网格节点数量为822万个。研究结果表明:排净时间与氮气压力呈线性关系,且随氮气压力的增大而缩短;氮气消耗量与氮气压力呈非线性关系,且随氮气压力的增大而增加。通过函数拟合得到排净时间和氮气消耗量的计算公式,并对比0.8 MPa和1.0 MPa 2种氮气压力工况下的数值计算结果与公式预测结果,发现排净时间的误差均小于0.5%,氮气消耗量的误差均小于2.0%,说明该计算公式是准确的。Nitrogen purging is an important step in the workflow of methanol supply system.In order to determine the purging time and nitrogen consumption under different nitrogen pressures,the homogeneous model,the standard turbulence model and the Volume of Fluid(VOF)multiphase flow model are used to carry out the numerical calculations on the nitrogen pressure conditions of 0.7 MPa,0.9 MPa and 1.1 MPa.The grid independence is verified by calculating steady-state nitrogen singe-phase operating conditions,and the number of grid nodes is determined to be 8.22 million.The results show that the purging time is linear with nitrogen pressure and decreases with the increase of nitrogen pressure,while the nitrogen consumption is nonlinear with nitrogen pressure and increases with the increase of nitrogen pressure.The specific formulas of purging time and nitrogen consumption are obtained by function fitting.The results of numerical calculation and formula prediction under nitrogen pressure of 0.8 MPa and 1.0 MPa are compared,which comes to the conclusion that the error of purging time is less than 0.5%and that of nitrogen consumption is less than 2.0%.This verifies the accuracy of the formulas.

关 键 词：甲醇供给系统 氮气吹扫 氮气压力 排净时间 氮气消耗量 

分 类 号：U664.1[交通运输工程—船舶及航道工程]