Explosion pressure characteristics of hydrogen-methane-ethanol mixtures
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摘要: 在初始温度为400 K，不同的初始压力（0.1、0.2、0.4 MPa）、乙醇体积分数（20%，50%，80%）和当量比（0.8～1.4）下，采用定容燃烧弹对氢气-甲烷-乙醇的爆炸特性进行研究。将实验中获得的原始电压信号转换为压力数据并进行高斯滤波降噪处理，通过爆炸压力、压力上升率、爆炸指数和爆炸时间等相关参数来分析爆炸特性，这些参数可以用于评估可燃物爆炸强烈程度，同时对燃料的层流燃烧速度、敏感性和反应路径进行分析。结果表明：随着初始压力的增加，预混燃料的爆炸压力峰值、最大压力上升速率、爆炸指数和爆炸时间均显著增加。乙醇比例的增加会降低最大压力上升速率和爆炸指数，但会增加爆炸压力和爆炸时间。燃料在不同的初始压力和乙醇比例下，总在当量比为1.2～1.3之间达到爆炸压力峰值、最大压力上升速率、爆炸指数的极大值和爆炸时间的极小值。此外，灵敏度分析表明预混燃料的爆炸反应程度与燃烧过程中生成的H和OH自由基数量有很大关系。总体而言，研究获得的爆炸指数在大多数工况下均低于20 MPa·m/s，表明该燃料处于相对安全水平。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.
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图 4 p0=0.4 MPa、
$ \varPhi $ =1时C2H5OH体积分数φ对爆炸压力曲线的影响Figure 4. Effect of the volume fraction of C2H5OH (φ) on explosion pressure while p0=0.4 MPa and
$ \varPhi $ =1
图 5 φ=20%、
$ \varPhi $ =1时初始压力p0对爆炸压力曲线的影响Figure 5. Effect of the initial pressure (p0) on explosion pressure while φ=20% and
$ \varPhi $ =1
图 6 当量比
$ \varPhi $ 对压力峰值pmax的影响Figure 6. Effect of the equivalence ratio
$ \varPhi $ on the peak pressure pmax
图 7 初始压力p0对压力峰值pmax的影响
Figure 7. Effect of initial pressure p0 on the peak pressure pmax
图 9 不同C2H5OH体积分数φ下压力上升速率曲线
Figure 9. Pressure rise rate changing with time at different ethnol volume fractions (φ)
图 10 不同初始压力p0条件下的爆炸压力上升率曲线
Figure 10. Explosion pressure rise rate curve at different initial pressures (p0)
图 12 最大压力上升速率(dp/dt)max和爆炸指数KG
Figure 12. Maximum pressure rise rate ((dp/dt)max) and explosion index (KG)
图 13 初始压力p0对爆炸压力上升率峰值（(dp/dt)max）的影响
Figure 13. Effect of initial pressure (p0) on the peak rate of explosion pressure rise ((dp/dt)max)
图 17 H2/CH4/C2H5OH实验和模拟层流燃烧速度的比较
Figure 17. Comparison of experimental and simulated results of laminar combustion velocity
图 18 不同C2H5OH体积分数φ下的灵敏度数据（400 K, 0.1 MPa, Φ=1.2）
Figure 18. Sensitivity coeffient at different vulume fractions (φ) under the condition of 400 K, 0.1 MPa, Φ=1.2)
图 19 不同初始压力p0下的灵敏度数据（400 K, φ=50%, Φ=1.2）
Figure 19. Sensitivity coeffient of at different pressures under the condition of (400 K, φ=50%, Φ=1.2)
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