氢气吸附干燥床层强化传热的数值模拟研究  

Numerical Simulation Investigation of Enhanced Heat Transfer Hydrogen Adsorption Drying Bed

作　　者：曾力丁[1] 朱冬生[1] 彭德其[1] 王春华[1] 谢振[1] 

机构地区：[1]华南理工大学传热强化与过程节能教育部重点实验室,广州510640

出　　处：《武汉理工大学学报》2006年第E02期317-324,共8页Journal of Wuhan University of Technology

基　　金：教育部新世纪优秀人才支持计划（NCET040826）;氢气净化应用纳米技术的研究;广东省重点科技攻关计划项目（2004A10702006）和高等学校博士学科点专项科研基金.

摘　　要：氢气的深度干燥常采用分子筛吸附干燥。在实验的基础上，将分子筛吸附量与时间的关系按照兰格缪尔模型拟合成解吸速率函数。将此函数应用于内置加热器加热再生吸附床层温度分布和吸附量的数值模拟。模拟结果随着表明，由于分子筛的导热性能较差，吸附床层径向温度分布不均匀，分子筛解吸程度不一致，而且解吸功率受到限制。通过采用在吸附床层内加入导热板能够获得均匀的温度场，因而能够获得更好的解吸效果。而且由于降低了加热器表面的热流密度，能够采用较大的功率进行吸附剂解吸。单位水量解吸能耗随着加热时间延长而上升。Adsorption drying is often used in the deeply drying of hydrogen in industry. Based on the experiments, the relationship between adsorption quantity and time is fitted to a desorption velocity function according to the modified Langumuir adsorption model. This function is applied to the numerical simulation of temperature field and adsorption quality in desorption process of adsorption bed which is heated by built-in electric heaters. The result of numerical simulation indicates that the values of temperature on radial direction are not evenly distributed due to the low coefficient of thermal conductivity of molecular sieve. As a result, the desorption of different positions of the bed is done at different levels. The heat power is restricted to a small value in order to avoid damaging the molecular sieve by high temperature. The evenly distributed temperature field could be achieved by add heat conduction plate in the adsorption bed. As a result, the better desorption result could be approaching. The heat conduction plate could decrease the density of heat flow, so the lager heat power can be adopted. When the heat power is fixed, the energy consumption of specific desorption quantity will increase with the heating time.

关 键 词：氢气 吸附 数值模拟 温度场 解吸 

分 类 号：TQ116.2[化学工程—无机化工]