Steam mole fraction data pertaining to the oxidation process in heterogeneously catalyzed reforming reactors with different catalyst support porosity

The steam mole fraction data are presented for illustrating the oxidation process in heterogeneously catalyzed reforming reactors with different catalyst support porosity. The steam mole fraction data are directed to a parallel reaction system, especially a chemical processing micro-system, which can simultaneously carry out exothermic and endothermic reactions in separate micro-channels and simultaneously adjust feed composition and flow rates. Specifically, the present study relates to a catalytic process of steam-methanol reforming for the production of hydrogen in a heterogeneous reactor system. The steam reforming process has several drawbacks, the primary ones being that the porosity of the catalyst supports is not as high as would appear to be optimum. To obtain the solution of the problem, numerical simulations are performed using fluid mechanics. The thermal conductivity of the wall material is 18.0 watts per meter-kelvin at room temperature. To assure that adequate temperatures are provided for endothermic reforming, operating flow conditions are specified for the reactor by giving the gas velocity. The gas velocity is 2.0 meters per second at the reforming channel inlets and 0.6 meters per second at the oxidation channel inlets, thereby assuring sufficient heat in the reactor to carry out endothermic reforming of methanol. The effective thermal conductivity of the catalyst layers is 16 watts per meter-kelvin at room temperature. The cross-sectional configuration of the channels is square. The channels are 0.7 millimeters in height and in width and 30.0 millimeters in length. Channel height refers to the inside height of a channel. To ensure the mechanical strength at elevated pressures, the thickness of the uncoated walls is 0.7 millimeters. The oxidation catalyst consists essentially of oxides of copper, zinc and aluminum. The reforming catalyst consists essentially of copper and oxides of zinc and aluminum. The exothermic and endothermic processes are conducted at a pressure of 0.8 megapascals, with a methanol-air equivalence ratio of 0.8 and a steam-to-methanol molar ratio of 1.17. The inlet temperature of the mixtures is 373 degrees kelvin. The temperature of the reactor can be regulated by the balance of the flow rates so that the catalyst is not overheated by the exothermic process and thus damaged. To facilitate computational modeling of transport phenomena and chemical kinetics in the reactor system, steady-state analyses are performed and fluid mechanics is used. ANSYS FLUENT is applied to the problem involving surface chemistry. Contributor: Junjie Chen, E-mail address: [e-mail], ORCID: 0000-0002-5022-6863, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China

本数据集提供蒸汽摩尔分数数据，用于阐释不同催化剂载体孔隙率的多相催化重整反应器内的氧化过程。该蒸汽摩尔分数数据针对平行反应体系，尤其是可在独立微通道内同时进行放热与吸热反应，并可同步调节进料组成与流量的化工微处理系统。具体而言，本研究针对多相反应器体系中用于制氢的蒸汽甲醇重整催化过程。蒸汽重整工艺存在若干缺陷，其中最主要的问题为催化剂载体的孔隙率未达到最优水平。为解决该问题，本研究采用流体力学方法开展数值模拟。反应器壁材在室温下的导热系数为18.0 W/(m·K)。为确保吸热重整反应所需的足够温度，本研究通过设定气体流速来明确反应器的运行工况：重整通道入口处的气体流速为2.0 m/s，氧化通道入口处为0.6 m/s，以此保证反应器内具备足够热量以开展甲醇吸热重整反应。催化剂层在室温下的有效导热系数为16 W/(m·K)。通道的截面构型为正方形，高度与宽度均为0.7 mm，长度为30.0 mm，其中通道高度指通道内部的净高。为保证高压工况下的机械强度，未涂层通道壁的厚度为0.7 mm。氧化催化剂主要由铜、锌与铝的氧化物组成，重整催化剂主要由铜以及锌、铝的氧化物组成。放热与吸热反应均在0.8 MPa的压力下进行，甲醇-空气当量比为0.8，蒸汽与甲醇的摩尔比为1.17。进料混合气的入口温度为373 K。可通过调节流量配比来调控反应器温度，避免催化剂因放热反应过热而受损。为便于对反应器体系内的传递现象与化学动力学开展计算建模，本研究采用稳态分析方法并结合流体力学理论，并使用ANSYS FLUENT软件处理涉及表面化学的相关问题。数据集贡献者：陈俊杰，电子邮箱：[e-mail]，ORCID（开放研究者与贡献者身份识别码）：0000-0002-5022-6863，河南理工大学机械与动力工程学院能源与动力工程系，中国河南省焦作市世纪大道2000号，邮编454000。