摘要
采用FLACS软件对天然气掺氢在临街餐厅受限空间中的爆炸行为进行研究,模拟中改变掺氢比例(氢气-天然气混合气中氢气体积分数分别为0%、10%、20%、30%)、点火位置(靠近封闭侧点火、中部点火、靠近餐厅门点火)、餐厅门启闭状态分析掺氢对爆炸特性的影响。模拟结果表明:4种掺氢比例、餐厅门关闭条件下:靠近餐厅门点火时,随着掺氢比例增加,爆炸压力峰值增大,达到爆炸压力峰值时间缩短,最高温度增加;中部点火时,掺氢对天然气爆炸起到加速作用,掺氢比例越大,爆炸强度越大,爆炸压力上升速度越快;3种点火位置下,靠近封闭侧点火达到爆炸压力峰值时间最长。掺氢比例为20%、餐厅门开启条件下:点火位置不同,相同监测点爆炸压力差别较大。4种掺氢比例、中部点火条件下:餐厅门关闭状态餐厅门外4 m处监测点爆炸压力峰值明显高于餐厅门开启状态。
FLACS software is used to study the explosion behavior of hydrogen-blended natural gas in the restricted space of restaurant facing street.In the simulation,the influence of hydrogen blending on the explosion characteristics is analyzed by changing the hydrogen blending ratios(the volume fraction of hydrogen in the mixture of hydrogen and natural gas is 0%,10%,20%and 30%,respectively),ignition positions(ignition near the closed side,ignition in the middle and ignition near the restaurant door)and the opening and closing state of the restaurant door.The simulation results show that under the conditions of four hydrogen blending ratios and restaurant door closing,when igniting near the restaurant door,with the increase of hydrogen blending ratio,the peak explosion pressure increases,the time to reach the peak explosion pressure decreases,and the maximum temperature increases.When igniting at the middle part,hydrogen blending accelerates the explosion of natural gas.The greater the hydrogen blending ratio,the greater the explosion intensity and the faster the rise speed of explosion pressure.Under the three ignition positions,the ignition near the closed side takes the longest time to reach the peak explosion pressure.When the hydrogen blending ratio is 20%and the restaurant door is opened,the explosion pressure at the same monitoring point varies greatly with different ignition positions.Under the conditions of four hydrogen blending ratios and ignition in the middle,the peak explosion pressure at the monitoring point 4 m outside the restaurant door in the closing state of the restaurant door is significantly higher than that in the opening state of the restaurant door.
作者
李亮
臧子璇
漆琦
李杜
黄小美
LI Liang;ZANG Zixuan;QI Qi;LI Du;HUANG Xiaomei
出处
《煤气与热力》
2022年第5期I0033-I0038,共6页
Gas & Heat
关键词
掺氢天然气
临街餐厅
爆炸特性
掺氢比例
hydrogen-blended natural gas
restaurant facing street
explosion characteristics
hydrogen blending ratio
