论文部分内容阅读
对甲烷和丙烷的二元混合气在流向变换催化燃烧器中的反应特性进行了模拟研究.选取总绝热温升作为基准参数,研究了混合气中甲烷所占比例和表观气速等运行条件对燃烧器运行规律和燃烧器熄火极限的影响.结果表明:甲烷和丙烷均在燃烧器入口附近迅速反应,且甲烷的总体反应速率低于丙烷;燃烧器内的温度水平随甲烷所占比例的增大而升高,流向变换催化燃烧器表现出床层最高温度随反应速率下降而上升的逆响应特性;甲烷和丙烷的催化燃烧过程均由本征反应动力学和传质过程共同控制;甲烷或丙烷单独反应时,燃烧器的熄火极限基本接近;甲烷-丙烷二元混合气的熄火浓度高于单一反应物,且当混合气中甲烷和丙烷的比例接近时,燃烧器的熄火极限最高.
The reaction characteristics of binary mixed gas of methane and propane in the flow direction shift catalytic combustor were simulated.The total adiabatic temperature rise was taken as the reference parameter to study the operating conditions of the methane in the mixed gas and the apparent gas velocity The results show that both methane and propane react rapidly near the burner entrance, and the overall methane reaction rate is lower than that of propane. The temperature in the burner increases with the proportion of methane Increases and increases, and the flow-direction catalytic converter exhibits a reverse response characteristic that the maximum temperature of the bed increases with the reaction rate. The catalytic combustion process of both methane and propane are jointly controlled by intrinsic reaction kinetics and mass transfer processes. Methane or When the propane is reacted alone, the flameout limit of the burner is basically close. The flameout concentration of the methane-propane binary mixture is higher than that of the single reactant. When the ratio of methane and propane in the mixture is close, the flameout limit of the burner is the highest.