The dimensionless Nusselt number data at different flow rates pertaining to the oxidation catalyst segmentation methods employed for continuous flow reactors

The dimensionless Nusselt number data at different flow rates are presented associated with the oxidation catalyst segmentation methods employed for continuous flow reactors. The reforming process proceeds in one set of the channels through which the endothermic reactants flow, and the exothermic oxidation process proceeds in the second set of the channels. Heat transfer occurs via conduction through the walls of the continuous flow reactor. For the endothermic reaction, the structure is especially effective because both the internal surfaces of the walls are coated with structured catalysts, which is capable of providing more efficient heat exchange and minimizing the problem of loss of catalytic activity. 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 and the catalyst layers is 0.7 millimeters and 0.1 millimeters, respectively. The oxidation catalyst consists essentially of oxides of copper, zinc and aluminum. The oxidation catalyst allows for initial start-up and the heat-up of the continuous flow reactor system. 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 continuous flow reactor can be regulated by the balance of the flow rates so that the catalyst is not overheated by the exothermic process. To assure that adequate temperatures are provided for endothermic reforming, operating flow conditions are specified for the continuous flow reactor by giving the gas velocity. The boundary conditions relate macroscopic fluid flow at a catalytically active surface to the rates of surface reactions. Heterogeneous reactions at a catalytically active surface affect the heat and mass balance at the surface. In each reforming channel, the catalyst layer is reduced by half in amount. The catalyst segments have a uniform distribution of length, and the spacing between catalyst segments is equal to their length. The porous media model is applied to the computational domains of the catalytically active layers. Each porous medium is modeled by the modification of a heat conduction flux term to the standard gas phase energy balance equation. 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

本数据集提供了不同流量下的无量纲努塞尔数（Nusselt number）数据，相关研究针对连续流反应器采用的氧化催化剂分段方法展开。重整反应在一组通道中进行，该通道内流通吸热反应物；而放热氧化反应则在另一组通道中开展。热量通过连续流反应器的壁面传导实现传递。对于吸热反应而言，该反应器结构尤为高效：反应器壁面的内表面均涂布有结构化催化剂，可实现更高效的热交换，并最大程度降低催化活性流失的问题。通道的高度与宽度均为0.7毫米，长度为30.0毫米；通道高度指的是通道内部的高度。为保证高压环境下的机械强度，未涂布壁面与催化剂层的厚度分别为0.7毫米与0.1毫米。该氧化催化剂主要由铜、锌与铝的氧化物组成，可用于连续流反应器系统的初始启动与升温过程。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0.8兆帕的压力下进行，甲醇-空气当量比为0.8，水醇摩尔比为1.17。反应物混合气的入口温度为373开尔文。可通过流量平衡调节连续流反应器的温度，避免催化剂因放热反应而过热。为确保吸热重整反应所需的充足温度，本数据集通过给出气体流速来限定连续流反应器的运行工况。边界条件将催化活性表面的宏观流体流动与表面反应速率关联起来。催化活性表面的多相反应会影响该表面的热质平衡。每条重整通道内的催化剂负载量均减半。催化剂分段的长度分布均匀，且分段之间的间距等于其自身长度。将多孔介质模型应用于催化活性层的计算域。通过对标准气相能量平衡方程的热传导通量项进行修正，来构建各多孔介质的模型。贡献者：陈俊杰，电子邮箱：[e-mail]，ORCID：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。