催化剂薄层内甲烷水蒸气重整反应强化管内对流换热的数值模拟
首发时间:2005-12-28
摘要:本文选取竖直圆管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;在本文计算的情况中,浮升力对换热的影响可以忽略不计;变物性对对流换热的影响很大,不能忽略其影响;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。
关键词: 甲烷水蒸气重整反应 催化剂薄膜 混合对流 浮升力 变物性
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Numerical simulation of enhanced convection heat transfer using methane-steam reforming in catalyst films in vertical tubes
Abstract:Convection heat transfer accompanied with steam reforming of methane in catalyst films in vertical tube was investigated in this paper with numerical simulation. The numerical results showed: endothermic chemical reaction in catalyst films can enhance convection heat transfer effectively and decrease the temperature of the coolant and surface to protect it. In this paper, the influence of buoyancy on heat transfer is not found and the influence of variable properties is significant, which cannot be neglected. The burned heat flux is related to the inlet temperature and the best inlet temperature exists to get the maximum burned heat flux.
Keywords: steam reforming of methane catalyst films mixed convection buoyancy variable properties
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