CIESC Journal ›› 2022, Vol. 73 ›› Issue (1): 451-460.DOI: 10.11949/0438-1157.20211256

• Process safety • Previous Articles     Next Articles

Experimental study on explosion characteristics of ternary mixed gas fuel

Shuangming WEI1(),Minggao YU1,2(),Bei PEI1,Shiliang LI1,Yaxiang KANG1,Mengjiao XU1,Jiaqi GUO1   

  1. 1.School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
    2.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
  • Received:2021-08-30 Revised:2021-09-14 Online:2022-01-18 Published:2022-01-05
  • Contact: Minggao YU

三元混合气体燃料爆炸特性实验研究

韦双明1(),余明高1,2(),裴蓓1,李世梁1,康亚祥1,徐梦娇1,郭佳琪1   

  1. 1.河南理工大学安全科学与工程学院,河南 焦作 454003
    2.重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044
  • 通讯作者: 余明高
  • 作者简介:韦双明(1992—),男,博士研究生,weishuangming@163.com
  • 基金资助:
    国家自然科学基金项目(52174164)

Abstract:

The effects of component concentration and equivalence ratio on the explosion characteristics of hydrogen/dimethyl ether/methane ternary mixed gas fuel were systematically studied by using the constant volume combustion bomb explosion experimental platform and high-speed schlieren camera technology. The results show that the average flame propagation speed Sa increases monotonically with the increase of hydrogen concentration XH2 and decreases monotonically with the increase of dimethyl ether concentration XDME. Also Sa decreases monotonically with XCH4. The variation of explosion pressure peak pmax with XH2 is strongly affected by equivalence ratio φ. When φ= 0.8, 1.0 and 1.2, pmax increases slowly and linearly with XH2, and then increases rapidly with XH2; While when φ=0.6, 1.4 and 1.6, pmax continuously increases linearly with XH2. Meanwhile, pmax decreases linearly with the increase of XCH4, but pmax can be divided into two periods with the change of XDME. In addition, XH2 is positively correlated with the maximum pressure rise rate (dp/dt)max, and XCH4 is negatively correlated with (dp/dt)max. However, XDME has little effect on (dp/dt)max. The combustion time tc has a linear relationship with XH2 and XCH4. Conversely, the influence of XDME on tc is more complicated, which is related to φ.

Key words: hydrogen, dimethyl ether, methane, explosion, pressure

摘要:

利用定容燃烧弹爆炸实验平台结合高速纹影摄像技术,系统研究了组分浓度和当量比对氢气/二甲醚/甲烷三元混合气体燃料爆炸特性的影响。结果表明:平均火焰传播速度Sa随氢气浓度XH2的增加单调递增,随二甲醚浓度XDME和甲烷浓度XCH4的增加单调递减。压力峰值pmaxXH2的关系受到当量比φ的强烈影响,当φ=0.8、1.0和1.2时,pmaxXH2先缓慢线性增加然后快速增加;而当φ=0.6、1.4和1.6时,pmax始终线性增加;同时,pmaxXCH4线性递减,而随XDME的变化可分为两个时期。XH2与最大压力上升速率(dp/dt)max呈正相关关系,XCH4与之呈负相关关系,而XDME对(dp/dt)max的影响不大。燃烧时间tcXH2XCH4存在线性关系;而XDMEtc的影响较为复杂,与φ有关。

关键词: 氢气, 二甲醚, 甲烷, 爆炸, 压力

CLC Number: