CO2/海泡石抑爆剂对氢气/甲烷爆炸特性参数的影响

doi:10.16085/j.issn.1000-6613.2022-0044

摘要/Abstract

摘要：

为了氢气/甲烷预混气体的安全使用，选用CO₂-海泡石粉体气固两相材料作为抑爆材料，通过20L球形爆炸装置测试了海泡石粉体及其浓度对氢气/甲烷预混气体的爆炸特性参数及抑制效果进行实验研究。结果表明，在不同的喷气压力下，粉体的分散性是不同的，造成了粉体最佳抑爆浓度的产生。二氧化碳单独作用下，氢气/甲烷预混气体在氢气添加比例较低时具有较好的抑制效果，对50%以上氢气添加下的氢气/甲烷预混气体的抑制效果较差。而CO₂和海泡石粉体两相抑制剂作用下复合抑爆剂对含氢气较高的氢气/甲烷预混气体具有较好的抑制效果。此外，本文结合海泡石粉体的元素组成及热解特性分析其氢气/甲烷抑爆机理。

关键词: 氢气/甲烷, 海泡石粉体, 两相抑制剂, 抑爆性能

Abstract:

For the safe use of hydrogen/methane premixed gas, the deflagration characteristics of hydrogen/methane premixed gas were studied by using gas-solid two-phase inhibitor. Using CO₂-sepiolite powder gas-solid two-phase material as explosion suppression material, the explosion characteristic parameters and inhibition effect of sepiolite powder and its concentration on hydrogen/methane premixed gas were tested by 20L spherical explosive device. The dispersibility of the powder was different under different jet pressure, which resulted in the production of the optimum explosion suppression concentration of the powder. Under the action of carbon dioxide alone, the hydrogen/methane premixed gas had a better inhibition effect when the hydrogen addition ratio was low, and the inhibition effect was poor for more than 50% hydrogen/methane premixed gas. Under the action of CO₂ and sepiolite powder two-phase inhibitor, the compound explosion sup-pressant had a good inhibitory effect on the hydrogen/methane premixed gas with high hydrogen content. In addition, the mechanism of gas explosion suppression was analyzed based on the element composition and pyrolysis characteristics of sepiolite powder.

Key words: hydrogen/methane, sepiolite powder, biphasic inhibitor, explosion suppression performance

中图分类号:

苏洋, 罗振敏, 王涛. CO₂/海泡石抑爆剂对氢气/甲烷爆炸特性参数的影响[J]. 化工进展, 2022, 41(11): 5731-5736.

SU Yang, LUO Zhenmin, WANG Tao. Effect of CO₂/sepiolite explosion suppressant on hydrogen/methane deflagration characteristic parameters[J]. Chemical Industry and Engineering Progress, 2022, 41(11): 5731-5736.

图/表 12

图1 20L球形抑爆实验系统示意图

表1 氢/甲烷/空气混合气的体积分数

φ	H₂/%	CH₄/%	空气/%
0	0	9.5	90.5
0.1	1.02	9.18	89.80
0.3	3.36	8.36	88.28
0.5	7.19	7.19	85.62
0.7	12.67	5.43	81.90
0.9	21.98	2.44	75.58
1	29.58	0	70.42

图2 海泡石粉体粒径图

图3 海泡石粉体SEM图

图4 纯甲烷条件下不同湍流强度的压力峰值变化图

图5 CO2作用下氢气/甲烷预混气体压力峰值变化情况

表2 二氧化碳作用下预混燃料的层流速度变化

CO₂添加比例/%	GRI Mech 3.0模型计算/m·s^-1
CO₂添加比例/%	φ=0	φ=0.1	φ=0.3	φ=0.5	φ=0.7	φ=0.9	φ=1
0	0.375	0.401	0.464	0.599	0.863	1.55	2.34
5	0.261	0.28	0.327	0.426	0.63	1.24	2.05
10	0.166	0.179	0.215	0.283	0.434	0.947	1.78
15	0.0837	0.0913	0.117	0.159	0.263	0.667	1.52

图6 CO2和海泡石粉体作用下氢气/甲烷预混气体压力峰值

图7 CO2和海泡石粉体作用下氢气/甲烷预混气体抑制效果

图8 CO2作用下氢气/甲烷预混气体到达压力峰值时间图

图9 海泡石粉体的热重、热差示扫描量热分析曲线

图10 CO2-海泡石粉体抑制机理图

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CO₂/海泡石抑爆剂对氢气/甲烷爆炸特性参数的影响

Effect of CO₂/sepiolite explosion suppressant on hydrogen/methane deflagration characteristic parameters

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