架空纯氢/掺氢管道泄漏扩散模拟  

Simulation of leakage and diffusion in overhead pure hydrogen/hydrogen-doped pipelines

作　　者：胡汪兴 金浩[1] 王华[2] 徐智良 HU Wangxing;JIN Hao;WANG Hua;XU Zhiliang(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;East China Electric Power Design Institute,Shanghai 200063,China)

机构地区：[1]华东理工大学化工学院,上海200237 [2]华东电力设计院,上海200063

出　　处：《化学工程》2024年第8期90-94,共5页Chemical Engineering(China)

基　　金：中电工程科研项目(GSKJ2-D12-2021)。

摘　　要：氢气是被广泛有效利用的清洁能源,管道输运是氢气输送的主要形式,但氢气爆炸范围为4%—75%,极限宽,且由于氢脆现象易发生泄漏,造成严重事故。针对输氢管道破裂后发生的泄漏扩散事故,建立三维架空纯氢/掺氢输送管道泄露模型,利用CFD软件ANSYS-Fluent进行泄露数值模拟计算,得到纯氢/掺氢气体的体积分数和危险范围,分析了管内压力、风速和掺氢比对泄露扩散的影响。模拟结果表明:管道压力增大会导致危险区域增大;风速增大会阻碍氢气向上扩散,同时使氢气向下风向转移,对泄漏呈现先增强后减小的趋势;掺氢比从10%增加到60%,掺氢天然气的爆炸下限下降了0.54%,且掺氢比越大,掺氢天然气的空间分布和扩散范围越广。Hydrogen is a clean energy that is widely and effectively utilized.Pipeline transportation is the main form of hydrogen transportation.However,the explosion range of hydrogen is 4%-75%,which has a wide limit.Moreover,leakage is prone to occur due to hydrogen embrittlement,causing serious accidents.In view of the leakage and diffusion accident that occurred after the hydrogen pipeline ruptured,a three-dimensional overhead pure hydrogen/hydrogen-doped pipeline leakage model was established,and the CFD software ANSYS-Fluent was used to perform leakage numerical simulation calculations to obtain the pure hydrogen/hydrogen-doped gas.Volume fraction and danger range,the influence of internal pressure,wind speed and hydrogen doping ratio on leakage diffusion was analyzed.The simulation results show that an increase in pipeline pressure leads to an increase in the dangerous area.An increase in wind speed hinders the upward diffusion of hydrogen,and at the same time shift hydrogen to the downwind direction,showing a trend of first increasing and then decreasing the leakage.The hydrogen doping ratio increases from 10%to 60%,the lower explosion limit of hydrogen-doped natural gas decreases by 0.54%,and the greater the hydrogen-doped ratio,the wider the spatial distribution and diffusion range of hydrogen-doped natural gas.

关 键 词：氢 泄漏扩散 管道输送 数值模拟 掺氢比 

分 类 号：TE88[石油与天然气工程—油气储运工程]