ABSTRACT

An experimental study on the catalytic combustion of dimethyl ether under various oxidation conditions through a preheated tubular catalytic reactor filled with a lab-made Pt-γ-Al₂O₃ catalyst is presented in this paper. Both the transient variance of temperature distribution during the ignition process and the stationary results as the reactor reaches stable are delineated. The catalytic reactor is mounted in a tubular furnace to preheat and maintain an isothermal boundary. The reaction profiles and ignition processes are characterized by monitoring the temporal temperature traces, which is the steady-state axial distribution of temperature in the reactor. The average axial reaction temperature for different fuel quantities with various isothermal boundaries of the reactor was also evaluated. During the light-off process, the main exothermal reaction zone shift is found. The results demonstrate that a higher equivalence ratio of reactants produces a higher temperature, resulting in more heat transferring upstream and causes a higher conversion ratio. For the same equivalence ratio, a higher isothermal boundary temperature will result in a higher conversion ratio. The more extended reactor is required in one of the two conditions of a lower equivalence ratio of reactants and a lower isothermal boundary of the reactor. Finally, the energy balance and exergy analysis for the reactor was also performed; the results will be the basis for improving and optimizing designs.

摘要

实验室制备的Pt-γ-Al ₂ O ₃填充的预热管式催化反应器在不同氧化条件下催化燃烧二甲醚的实验研究本文介绍了催化剂。描绘了点火过程中温度分布的瞬态变化和反应堆达到稳定时的平稳结果。催化反应器安装在管式炉中以预热并保持等温边界。反应曲线和点火过程的特征在于监测时间温度轨迹，这是反应器中温度的稳态轴向分布。还评估了具有不同反应器等温边界的不同燃料量的平均轴向反应温度。在起燃过程中，发现主要的放热反应区移动。结果表明，较高的反应物当量比会产生较高的温度，导致更多的热量向上游传递并导致更高的转化率。对于相同的当量比，较高的等温边界温度将导致较高的转化率。在反应物的较低当量比和反应器的较低等温边界的两个条件之一中需要更多扩展的反应器。最后，还进行了反应堆的能量平衡和火用分析；结果将成为改进和优化设计的基础。还进行了反应堆的能量平衡和火用分析；结果将成为改进和优化设计的基础。还进行了反应堆的能量平衡和火用分析；结果将成为改进和优化设计的基础。