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催化燃烧可增强微型燃烧器的工作稳定性。对石英玻璃、刚玉陶瓷、紫铜3种不同材料制作的微尺度催化燃烧器,在0.12～0.36L/min、当量比浓度下进行实验比较。利用贵金属Pt为催化剂,石棉为催化剂载体,氢气/空气预混气体为燃料。实验结果显示,催化燃烧器具有很高燃烧稳定性。使用数值模拟观察燃烧器内部燃烧过程。模拟结果显示石英玻璃和刚玉陶瓷燃烧器存在明显的热点,其在0.12L/min时分别达到约1475K和1427K,而紫铜燃烧器内部的温度较低,一般不超过1200K,且分布均匀。对燃烧器散热分析发现,导热率较低的材料反而散热较高,如石英玻璃燃烧器散热在0.12L/min时高于紫铜燃烧器2.61W。由于不同燃烧器中的反应模式不同,石英玻璃和刚玉陶瓷中主要为气相反应,紫铜燃烧器中主要为两相反应,因此产生上述现象。
Catalytic combustion can enhance the working stability of the micro-burner. The microscale catalytic burners made of three different materials, quartz glass, corundum ceramic and copper, were compared at 0.12-0.36 L / min, equivalent specific concentration. Pt as precious metal catalyst, asbestos catalyst carrier, hydrogen / air premixed gas fuel. Experimental results show that the catalytic burner has high combustion stability. Use the numerical simulation to observe the internal combustion process in the burner. The simulation results show that there are obvious hot spots in quartz glass and corundum ceramic burners, which reach about 1475K and 1427K respectively at 0.12L / min, while the internal temperature of copper burners is lower, generally not exceeding 1200K, and the distribution is even. Analysis of the burner cooling found that the lower the thermal conductivity of materials on the contrary higher heat, such as quartz glass burner heat dissipation at 0.12L / min higher than copper burner 2.61W. Due to the different reaction modes in different burners, the gas phase reaction mainly occurs in quartz glass and corundum ceramics, and the two-phase reaction mainly occurs in the copper burner, thus the above phenomenon occurs.