Purpose

The purpose of this paper is to investigate the heat and mass transport characteristics in microchannel reactors with non-uniform catalyst distributions.

Design/methodology/approach

A two-dimensional model is developed to study the heat and mass transport characteristics in microchannel reactors. The heat and mass transport processes in the microchannel reactors with non-uniform catalyst distribution in the catalytic combustion channel are also studied.

Findings

The simulated results are compared in terms of the distributions of species mole fraction, temperature and reaction rate for the conventional and new designed reactors. It is found that the chemical reaction, heat and mass transport processes are significantly affected and the maximum temperature in the reactor is also greatly reduced when a non-uniform catalyst distribution is applied in the combustion catalyst layer.

Practical implications

This study can improve the understanding of the transportation characteristics in microchannel reactors with non-uniform catalyst distributions and provide guidance for the design of microchannel reactors.

Originality/value

The design of microchannel reactors with non-uniform catalyst distributions can be used in methane steam reforming to reduce the maximum temperature inside the reactor.

中文翻译：

---

催化剂分布不均匀的微通道反应器产氢传热传质特性分析

目的

本文的目的是研究具有非均匀催化剂分布的微通道反应器中的传热和传质特性。

设计/方法/方法

开发了一个二维模型来研究微通道反应器中的传热和传质特性。还研究了催化燃烧通道中催化剂分布不均匀的微通道反应器的传热传质过程。

发现

模拟结果比较了传统反应器和新设计反应器的物种摩尔分数、温度和反应速率的分布。研究发现，在燃烧催化剂层采用不均匀的催化剂分布时，化学反应、传热和传质过程受到显着影响，反应器最高温度也大大降低。

实际影响

该研究可以加深对催化剂分布不均匀的微通道反应器中传输特性的理解，为微通道反应器的设计提供指导。

原创性/价值

具有非均匀催化剂分布的微通道反应器的设计可用于甲烷蒸汽重整以降低反应器内的最高温度。