金属氢化物热压缩机吸放氢传热传质的对称性研究  

Study on Heat and Mass Transfer Symmetry Characteristic of Metal Hydride Thermal Compressor During Absorption/Desorption Process

作　　者：马进成[1] 杨福胜[2] 王玉琪[1] 吴震[2] 鲍泽威[2] 张早校[2] 曹建党 

机构地区：[1]西北大学化工学院,西安710069 [2]西安交通大学化学工程与技术学院,西安710049 [3]西安西骏新材料有限公司,西安710086

出　　处：《西安交通大学学报》2013年第9期119-125,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(21276209);西安市科技局技术转移促进工程项目(CX1245-7);西安市碑林区科技计划资助项目(GX1204);西北大学研究生自主创新资助项目(YZZ12041)

摘　　要：针对金属氢化物热压缩机(MHTC)在实际应用过程中存在的吸放氢非对称性限制,开展了MHTC传热传质对称性的研究和优化。根据局部热平衡模型,以2D圆环剖面为计算区域,对MHTC多管束反应器实施了模拟,并对模拟过程中的参数及结构进行了优化。优化结果表明:以4层管的多管束反应器为基准,改变吸放氢反应条件能改善反应过程的不对称性特征,即吸、放氢压力分别为2、0.05MPa,温度为293、393K,传热系数为1 000 W/(m2·K)时,吸氢反应分率由0.1上升到0.9;放氢反应分率由0.9降至0.1时,所用时间分别为350和360s,温度变化幅度分别为40和43K,显示出明显的对称性。在反应前20s内,放氢过程中平衡压力的变化剧烈,占平衡压力总变化量的50%以上,为反应过程中的高效反应阶段。Research and optimization were conducted on heat and mass transfer symmetry of metal hydride thermal compressor （MHTC） between absorption/desorption during the operation of MHTC. On the basis of the local thermal equilibrium model, numerical simulation was performed on a domain with 2D annulus in multi-tube MHTC reactors, and the parameters of the simulation process and structure were also optimized. The results show that for the 4-layer multi-tube reactor, it expends 350 s for the reaction fraction to increase from 0.10 to 0.90 during absorption and 360 s to drop from 0.90 to 0.10 during desorption when the hydrogen pressure, temperature, and heat transfer coefficient are 2/0.05 MPa （absorption/desorption）, 293/393 K, 1 000 W · m-2 · K-1, respectively. The largest temperature differences are 40 K and 43 K, respectively, showing a clear asymmetry between absorption/desorption. The equilibrium pressure inside the multi-tube reactor changes significantly and more than 50% of its total variation occurs in the first 20 s during desorption.

关 键 词：金属氢化物 热压缩机 反应器 传热传质 

分 类 号：TG139.7[一般工业技术—材料科学与工程]