初始压力对合成气爆炸下限的影响研究*

doi:10.16265/j.cnki.issn1003-3033.2022.08.1555

中国安全科学学报 ›› 2022, Vol. 32 ›› Issue (8): 120-125.doi: 10.16265/j.cnki.issn1003-3033.2022.08.1555

初始压力对合成气爆炸下限的影响研究*

尚融雪(), 庄紫喧, 杨悦, 牛江宇, 李刚

东北大学火灾 & 爆炸防治实验室,辽宁沈阳 110819

收稿日期:2022-01-07 修回日期:2022-05-10 出版日期:2022-09-05 发布日期:2023-02-28
作者简介:
尚融雪 (1987—),女,辽宁沈阳人,博士,讲师,主要从事工业爆炸机制及防治技术方面的科研及教学工作。E-mail: rongxue.shang@foxmail.com。
李刚,教授。
基金资助:
国家自然科学基金资助(51804065); 中国博士后科学基金资助(2018M631811); 中央高校基本科研业务专项资金资助(N2001023)

Effect of initial pressures on lower explosion limits of syngas

SHANG Rongxue(), ZHUANG Zixuan, YANG Yue, NIU Jiangyu, LI Gang

Fire & Explosion Protection Laboratory, Northeastern University, Shenyang Liaoning 110819, China

Received:2022-01-07 Revised:2022-05-10 Online:2022-09-05 Published:2023-02-28

摘要/Abstract

摘要：

利用8 L圆柱型爆炸罐试验测量不同初始压力下合成气爆炸下限 (LEL),通过Chemkin-Pro软件模拟研究初始压力对合成气近下限燃烧的影响效应,并校核Le Chatelier(L-C)计算式、二次多项式、线性及对数函数拟合关系式对加压宽含氢比合成气LEL的适用性。结果表明:合成气LEL随含氢比的升高呈下降趋势,随初始压力的升高近线性下降;加压条件下,H自由基及OH自由基的摩尔分数发生变化,导致H+O₂=O+OH等重要支链反应的敏感性系数发生变化,进而使合成气LEL显著降低;与L-C计算式相比,二次多项式对高压下合成气LEL的估算更准确;线性函数关系式可准确计算不同初始压力下的合成气LEL。

关键词: 初始压力, 合成气, 爆炸下限 (LEL), 含氢比, Le Chatelier(L-C)计算式

Abstract:

The lower explosion limit (LEL) of syngas under different initial pressures was measured by 8 L cylindrical explosion tank. The effect of initial pressure on the near-low limit combustion of syngas was simulated by Chemkin-Pro software, and the applicability of Le Chatelier (L-C) calculation formula, quadratic polynomial, linear and logarithmic function fitting relationship to the LEL of pressurized syngas with wide hydrogen content ratio was checked. The experimental results show that the LEL of syngas decreases with the increase of H₂ content ratio, and decreases linearly with the increase of initial pressure. Under the high pressure condition, the mole fraction of H radical and OH radical changed, resulting in the change of the sensitivity coefficient of important branched-chain reactions such as H+O₂=O+OH, which further reduced the LEL of syngas. Compared with the L-C calculation formula, the quadratic polynomial is more accurate in estimating the LEL of syngas under high pressure. Furthermore, the linear function relationship can accurately calculate the syngas LEL under different initial pressures.

Key words: initial pressure, syngas, lower explosion limits(LEL), hydrogen ratio, Le Chatelier(L-C) formula

尚融雪, 庄紫喧, 杨悦, 牛江宇, 李刚. 初始压力对合成气爆炸下限的影响研究*[J]. 中国安全科学学报, 2022, 32(8): 120-125.

SHANG Rongxue, ZHUANG Zixuan, YANG Yue, NIU Jiangyu, LI Gang. Effect of initial pressures on lower explosion limits of syngas[J]. China Safety Science Journal, 2022, 32(8): 120-125.

图/表 9

图1

表1

不同含氢比下合成气的LEL

$x H 2$	P /MPa
$x H 2$	0.1	0.2	0.3
0	12.77	12.13	11.65
0.25	8.28	7.90	7.23
0.50	6.48	5.54	5.11
0.75	5.09	4.88	4.23
1.00	4.22	3.95	3.13

表1

图2

图3

图4

图5

图6

表2

试验数据线性拟合

$x H 2$	表达式	R²
0	LEL=-5.6P+13.30	0.993 2
0.25	LEL=-5.3P+8.85	0.975 2
0.50	LEL=-6.9P+7.08	0.955 9
0.75	LEL=-4.3P+5.59	0.919 7
1.00	LEL=-5.5P+4.74	0.992 0

表2

表3

试验数据对数拟合

$x H 2$	表达式	R²
0	LEL=-2.32lg(10P) +12.79	0.995 4
0.25	LEL=-2.10lg(10P) +8.35	0.908 0
0.50	LEL=-2.90lg(10P) +6.46	0.996 2
0.75	LEL=-1.68lg(10P) +5.17	0.820 7
1.00	LEL=-2.26lg(10P) +4.23	0.996 4

表3

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初始压力对合成气爆炸下限的影响研究*

Effect of initial pressures on lower explosion limits of syngas

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