Ni/Rh催化剂下微通道甲烷自热重整制氢特性研究

Characteristic Study of Micro-channel Auto-thermal Reforming of Methane with Ni/Rh Catalysts

针对微细通道内甲烷自热重整反应,采用活性位浓度比为10∶1的Ni/Rh催化剂建立了数学物理模型,通过数值模拟方法研究了绝热工况下温度、流量、氧碳比及水碳比等因素对催化重整特性的影响规律。结果表明:催化反应的温度阈值为750K,当温度超过750K时甲烷转化率迅速升高;在纯氧条件下随着甲烷流量的增大,制氢功率增大,而在空气条件下制氢功率减小;随着氧碳比的增加,甲烷的转化率升高,制氢功率先增大后逐渐减小;随着水碳比的增加,甲烷转化率降低;当入口反应气中氧碳比控制在0.5以下、水碳比为3.5且入口温度为900K时,可实现微通道内甲烷催化重整的高效转化。

Micro-channel auto-thermal reforming（ATR） of methane with Ni/Rh catalysts （the concentration ratio of surface active sites is 10 ： 1） was investigated. A mathematical-physical model was implemented to simulate the affection on adiabatic boundary condition and constraints, such as temperature, mass flow rate, oxygen/methane ratio and water/methane ratio. The results show that the reaction threshold temperature is 750K, once the inlet gas temperature exceed 750K, the ATR can carry out and accelerate; On the constant inlet mass flow rate of methane and pure oxygen environment, power of hydrogen production can be significantly improved; Raising the oxygen/methane ratio can effectively enhance the molar conversion of methane, the hydrogen power will increase, and then reduce; When oxygen/methane ratio below 0. 5, water/methane ratio around 3. 5, and temperature at 900K, the catalytic ATR of micro-channel can have high efficienev.