CH4/N2、CH4/CO2二元和CH4/N2/CO2三元混合气体爆炸极限的实验与估算

孙俊芳; 张可; 郭保玲; 杨小莉; 常旭宁; 吴江涛

doi:10.11883/1001-1455(2015)05-0747-06

CH₄/N₂、CH₄/CO₂二元和CH₄/N₂/CO₂三元混合气体爆炸极限的实验与估算

doi: 10.11883/1001-1455(2015)05-0747-06

1.
北京市燃气集团有限责任公司, 北京 100035
2.
西安交通大学热流科学与工程教育部重点实验室, 陕西西安 710049

基金项目: 国家自然科学基金项目(51276142);北京市科技计划重点资助项目(D12110900040000)；江苏省自然科学基金项目(SBK201122327)

详细信息

作者简介:
孙俊芳(1980—), 男, 硕士

通讯作者:
张可, k.zhang@mail.xjtu.edu.cn

中图分类号: O381
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- 被引次数: 0
出版历程
- 收稿日期: 2014-01-16
- 修回日期: 2014-06-06
- 刊出日期: 2015-10-10

Measurement and estimation for the flammability limits of binary mixtures of CH₄/N₂, CH₄/CO₂and ternary mixtures of CH₄/N₂/CO₂

1.
Beijing Gas Group Co.Ltd, Beijing 100035, China
2.
Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China

摘要

摘要: 为了获取甲烷与不可燃组分组成的混合物的爆炸极限，采用一种基于绝热火焰温度的混合物爆炸极限估算方法，对CH₄/N₂和CH₄/CO₂这2种二元混合气体及3种不同阻燃剂体积分数的CH₄/N₂/CO₂三元混合气体的爆炸极限进行实验研究，并将实验结果与估算值进行比较。CH₄/N₂与CH₄/CO₂二元混合物实验值与估算值在爆炸上限处的平均绝对偏差为0.34%，在爆炸下限处的平均绝对偏差为0.15%。3种不同比例的三元混合物实验值与估算值在爆炸上限处的平均绝对偏差为0.43%，在爆炸下限处的平均绝对偏差为0.20%。结果表明，估算方法对甲烷与不可燃组分的二元混合物与三元混合物爆炸极限的估算均具有较高的准确度。
- 爆炸力学 /
- 爆炸极限 /
- 绝热火焰温度 /
- 混合气体 /
- CH₄ /
- 阻燃剂
Abstract: Flammability limits for the binary mixtures of CH₄/N₂ and CH₄/CO₂ were measured, and the ternary mixtures of CH₄/N₂/CO₂ with three different diluent volume ratios were studied. A method based on the adiabatic flame temperature was introduced to estimate the flammability limits of the mixtures, and the experimental results were compared with the estimated values. The average absolute deviation between the experimental results and estimated values of the lower flammability limit for the two binary mixtures is 0.15%, and for the upper flammability limit is 0.34%. The average absolute deviation between the experimental results and estimated values of the lower flammability limit for the three ternary mixtures is 0.20%, and for the upper flammability limit is 0.43%. The results showed that the method is available for estimating the flammability limits of the binary and ternary mixtures of methane with diluent gases.
- mechanics of explosion /
- flammability limit /
- adiabatic flame temperature /
- mixture /
- CH₄ /
- diluent

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图 1 实验装置

Figure 1. The experimental apparatus

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图 2 二元混合物爆炸极限实验值与估算结果对比

Figure 2. Comparison of flammability limits of binary mixtures between experimental and estimated results

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图 3 三元混合物爆炸极限实验值与估算结果对比

Figure 3. Comparison of flammability limits of ternary mixtures between experimental and estimated results

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表 1 CH₄与N₂/CO₂组成的二元和三元混合物的爆炸极限实验和估算结果

Table 1. Flammability limits of binary and ternary mixtures of CH₄ with N₂/CO₂

φ(N₂, CO₂)/%	φ_l/%(φ(N₂):φ(CO₂)=0:1)			φ_u/%(φ(N₂):φ(CO₂)=0:1)
φ(N₂, CO₂)/%	实验	估算	Δ	实验	估算	Δ
0	5.25	5.25	0.00	14.10	14.10	0.00
20	5.33	5.30	-0.03	13.50	12.90	-0.60
40	5.33	5.38	0.05	11.80	11.40	-0.40
60	5.62	5.54	-0.08	9.60	9.15	-0.45
75	6.16	5.87	-0.29	7.38	6.77	-0.61
77	6.53	5.95	-0.58	6.83	6.39	-0.44
78	6.65	5.99	-0.66	6.65	6.19	-0.46
φ(N₂, CO₂)/%	φ_l/%(φ(N₂):φ(CO₂)=1:0)			φ_u/%(φ(N₂):φ(CO₂)=1:0)
φ(N₂, CO₂)/%	实验	估算	Δ	实验	估算	Δ
0	5.25	5.25	0.00	14.10	14.10	0.00
20	5.28	5.25	-0.03	13.40	13.20	-0.20
40	5.18	5.25	0.07	12.10	12.00	-0.10
60	5.28	5.24	-0.04	10.30	10.10	-0.20
80	5.23	5.24	0.01	7.38	6.86	-0.52
85	5.29	5.23	-0.06	6.23	5.65	-0.58
87	5.40	5.23	-0.17	5.40	5.10	-0.30
φ(N₂, CO₂)/%	φ_l/%(φ(N₂):φ(CO₂)=1:3)			φ_u/%(φ(N₂):φ(CO₂)=1:3)
φ(N₂, CO₂)/%	实验	估算	Δ	实验	估算	Δ
0	5.25	5.25	0.00	14.10	14.10	0.00
30	5.35	5.31	-0.04	12.50	12.30	-0.20
60	5.57	5.46	-0.11	9.93	9.37	-0.56
70	5.73	5.59	-0.14	8.65	7.90	-0.75
75	5.89	5.70	-0.19	7.75	7.02	-0.73
78	6.50	5.79	-0.71	6.50	6.43	-0.07
φ(N₂, CO₂)/%	φ_l/%(φ(N₂):φ(CO₂)=1:1)			φ_u/%(φ(N₂):φ(CO₂)=1:1)
φ(N₂, CO₂)/%	实验	估算	Δ	实验	估算	Δ
0	5.25	5.25	0	14.10	14.10	0.00
30	5.36	5.29	-0.07	12.80	12.40	-0.40
60	5.39	5.39	0.00	10.20	9.60	-0.60
75	5.65	5.53	-0.12	8.01	7.28	-0.73
80	5.98	5.64	-0.34	6.89	6.27	-0.62
81	6.50	5.66	-0.84	6.50	6.05	-0.45
φ(N₂, CO₂)/%	φ_l/%(φ(N₂):φ(CO₂)=3:1)			φ_u/%(φ(N₂):φ(CO₂)=3:1)
φ(N₂, CO₂)/%	实验	估算	Δ	实验	估算	Δ
0	5.25	5.25	0.00	14.10	14.10	0.00
30	5.28	5.27	-0.01	13.00	12.60	-0.40
60	5.32	5.32	0.00	10.40	9.80	-0.60
80	5.59	5.43	-0.16	7.25	6.55	-0.70
83	5.85	5.47	-0.38	6.44	5.86	-0.58
84	6.00	5.49	-0.51	6.00	5.61	-0.39

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表 2 混合物爆炸极限估算中的系数及临界可燃体积分数

Table 2. Parameters in the estimation equations and the critical flammability ratio

φ(N₂):φ(CO₂)	α_l	α_u	φ_c/%
φ(N₂):φ(CO₂)	α_l	α_u	实验	估算
0:1	-6.667×10^-3	2.559×10^-2	79	78
1:3	-4.966×10^-3	2.387×10^-2	81	78
1:1	-3.266×10^-3	2.214×10^-2	82	81
3:1	-1.566×10^-3	2.042×10^-2	84	84
1:0	1.338×10^-4	1.870×10^-2	87	87

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