Explosion pressure characteristics of hydrogen-methane-ethanol mixtures

GUO Hongzhan; ZHANG Yan; WANG Xiaorong

doi:10.11883/bzycj-2023-0224

Volume 43 Issue 12

Dec. 2023

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GUO Hongzhan, ZHANG Yan, WANG Xiaorong. Explosion pressure characteristics of hydrogen-methane-ethanol mixtures[J]. Explosion And Shock Waves, 2023, 43(12): 125403. doi: 10.11883/bzycj-2023-0224

Citation:

GUO Hongzhan, ZHANG Yan, WANG Xiaorong. Explosion pressure characteristics of hydrogen-methane-ethanol mixtures[J]. Explosion And Shock Waves, 2023, 43(12): 125403. doi: 10.11883/bzycj-2023-0224

GUO Hongzhan, ZHANG Yan, WANG Xiaorong. Explosion pressure characteristics of hydrogen-methane-ethanol mixtures[J]. Explosion And Shock Waves, 2023, 43(12): 125403. doi: 10.11883/bzycj-2023-0224

Citation:

GUO Hongzhan, ZHANG Yan, WANG Xiaorong. Explosion pressure characteristics of hydrogen-methane-ethanol mixtures[J]. Explosion And Shock Waves, 2023, 43(12): 125403. doi: 10.11883/bzycj-2023-0224

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Explosion pressure characteristics of hydrogen-methane-ethanol mixtures

doi: 10.11883/bzycj-2023-0224

College of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China

Received Date: 2023-06-28
Rev Recd Date: 2023-08-30

Available Online: 2023-10-25

Publish Date: 2023-12-12

Abstract

Abstract

In the future, the use of bioethanol for hydrogen production in integrated hydrogen production and hydrogenation stations, along with its transportation through natural gas pipelines, will become the mainstream approach. However, the mixture of fuels poses risks related to storage and pipeline transportation, and in the presence of an ignition source, it can lead to explosive accidents. Therefore, studying the explosion characteristics of hydrogen-methane-ethanol mixture fuels is of paramount importance. In this study, the explosion characteristics of hydrogen-methane-ethanol mixtures were investigated using a 1.94 L constant-volume combustion bomb. Experiments were conducted under various initial conditions, including an initial temperature of 400 K, different initial pressures (0.1, 0.2, 0.4 MPa), and equivalence ratios (0.8−1.4). Mixtures with ethanol volume fractions of 20%, 50%, and 80% were examined. Detailed data analysis involved parameters such as explosion pressure, pressure rise rate, explosion index, and explosion time. These parameters were used to assess the intensity of combustible material explosions. Additionally, fundamental combustion characteristics were explored, including laminar burning velocity, sensitivity, and reaction pathways of the fuel. The results revealed that with an increase in initial pressure, the explosion pressure peak, maximum pressure rise rate, explosion index, and explosion time of the premixed fuel significantly increased. An increase in ethanol content lowered the maximum pressure rise rate and explosion index but raised the explosion pressure and time. Regardless of initial pressure and ethanol content, the fuel consistently reached its peak explosion pressure, maximum pressure rise rate, explosion index, and minimum explosion time within an equivalence ratio range of 1.2−1.3. Moreover, sensitivity analysis indicated that at high pressures and low ethanol ratios, more H and OH radicals were produced during the fuel reaction process. From the reaction pathway diagram, it is evident that the radical quantity decreases with an increase in ethanol content, explaining the increased explosion index at high pressure and low ethanol ratios. Overall, the obtained explosion index remains below 20 MPa∙m/s in most operating conditions, signifying that the fuel operates at a relatively safe level.
- hydrogen methane ethanol,
- explosion characteristics,
- explosion pressure,
- explosion index,
- sensitivity coefficient

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References

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