基于SMX静态混合器的天然气掺氢流动影响研究
Investigation on the Influence of Natural Gas and Hydrogen Mixing Flow Based on SMX Static Mixer
刘永振 1陈天昊 2赵序海 1Ihsan Shahid 1Anas 1肖秋红 1马凡华1
作者信息
- 1. 清华大学车辆与运载学院,北京 100084
- 2. 中国地质大学(武汉)珠宝学院,湖北武汉 430074
- 折叠
摘要
为了获取均匀的天然气掺氢混合气,确保掺氢燃气管道稳定、安全输送,采用数值模拟与试验相结合的方法研究了天然气与氢气在SMX静态混合器中的掺混特性及影响因素,详细分析了掺混单元数量、运行工况和掺氢体积比等因素对掺混性能的影响.研究结果表明,氢气与天然气的混合主要依赖于混合单元不断改变流动状态,实现左旋和右旋相互交替,达到均匀混合.流动损失主要取决于静态混合器内流动速度,综合考虑SMX静态混合器的压力损失和混合均匀度性能指标,采用4个掺混单元、进口气流速度10m/s是一个优选方案.此外,增大掺氢体积比和加长流经混合器出口下游管道长度均有利于提升氢气和天然气掺混均匀度,要结合燃气管道的具体情况来确定掺氢体积比的合理范围.
Abstract
In order to obtain a uniform mixed fuel of natural gas and hydrogen for the stable and safe transportation of hydrogen mixing gas pipeline,the mixing characteristics and influencing factors of natural gas and hydrogen in SMX static mixer were studied by combining numerical simulation and experiment.The influence factor such as the number of mixing elements,operating conditions,and hydrogen volume ratio on the mixing performance were analyzed in detail.The results indicate that the mixing behavior of hydrogen and natural gas is mainly attributed to the continuous change of flow state by mixing elements,achieving alternating left and right rotation,and ultimately reaching uniform mixing.The flow loss mainly depends on the flow velocity inside the mixer.Four mixing elements with a flow rate of 10 m/s is a preferred scheme taking into account the performance indexes of pressure loss and mixing uniformity of the SMX static mixer.In addition,increasing the hydrogen volume ratio and lengthening the length of the downstream pipeline of the mixer outlet are conducive to improving the mixing uniformity of hydrogen and natural gas.The hydrogen volume ratio should be determined according to the specific situation of the gas pipeline to determine its reasonable range.
关键词
静态混合器/天然气/氢气/掺混单元/混合均匀度/流动损失/掺氢体积比Key words
static mixer/natural gas/hydrogen/mixing element/mixing uniformity/flow loss/hydrogen volume ratio引用本文复制引用
基金项目
汽车安全与节能国家重点实验室开放基金项目(KFY2230)
内蒙古自治区科技重大专项项目(2021ZD0025)
内蒙古自治区科技重大专项项目(2021SZD0083)
出版年
2024
NETL
NSTL
万方数据