本文以竖直圆管内壁催化剂薄层内发生甲烷水蒸气重整反应强化对流换热作为研究对象,对其进行了数值模拟．结果发现,催化剂薄层内的吸热化学反应可以有效地强化对流换热,降低流体和壁面温度,从而对壁面起到保护作用;极限热流密度的大小与流体的入口温度有关,存在最佳入口温度使极限热流密度最大． In this paper, the steam-water reforming reaction of methane in the inner wall of the vertical tube was used to enhance the convective heat transfer as a research object, and the numerical simulation was carried out. The results show that the endothermic chemical reaction in the catalyst layer can effectively enhance the convective heat transfer and reduce the temperature of the fluid and the wall, thus protecting the wall. The limit heat flux density is related to the inlet temperature of the fluid, and there exists an optimal inlet Temperature limits the maximum heat flux density.