Contributions of homogeneous and heterogeneous reactions to the catalytically supported thermal combustion of methane-air mixtures in microchannel reactors

The homogeneous and heterogeneous contributions directed to the catalytically supported thermal combustion of methane-air mixtures in microchannel reactors. The microchannel reactor comprises a concentric annular channel, wherein the concentric annular channel further comprises an inner annular channel and an outer annular channel. A platinum catalyst is deposited only upon the interior surface of the inner channel, and the wall of the outer channel is chemically inert and catalytically inactive. The reactant stream flows through the catalytically-coated inner channel and the product stream flows out of the outer non-catalytic channel. Fuel is present for combustion in both the catalytic and non-catalytic channels. The concentrically arranged annular channel is 5.0 millimeters in inner channel length, 5.6 millimeters in outer channel length, 0.8 millimeters in innermost diameter, 2.6 millimeters in outermost diameter, 0.1 millimeters in catalyst layer thickness, and 0.2 millimeters in wall thickness. The spacing between the inner channel and the outer channel is 0.4 millimeters and remains constant. The system can have any dimension unless restricted by design requirements. All the walls have the same thickness. One of the potential problems associated with the system, as with all micro-scale combustion systems, continues to be combustion stability. The maximum Reynolds number is less than 360 at the flow inlet and 960 when the velocity of the flow of the fluid is highest in the channels. The model is implemented in commercially available software FLUENT to obtain the solution of the problem. Detailed chemistry is included in the model. Detailed chemical mechanisms are playing an increasingly important role in developing chemical kinetics models for combustion. Detailed chemical mechanisms are incorporated into the reacting flow for the system. The homogeneous combustion is modeled with the detailed chemical mechanism for methane oxidation in CHEMKIN format. Detailed heterogeneous chemistry in SURFACE-CHEMKIN format is included in the model. The rates of the elementary reactions involved in the combustion process are determined by Arrhenius kinetic expressions. Numerical simulations with the detailed chemical mechanism are typically computationally expensive. The detailed chemical mechanism is invariably stiff and therefore its numerical integration is computationally costly. 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

本数据集聚焦于微通道反应器内负载催化剂辅助的甲烷-空气混合物热燃烧过程中的均相与非均相反应贡献。该微通道反应器采用同心环形通道结构，该通道分为内环形通道与外环形通道。仅在内通道内壁表面沉积铂催化剂，外通道壁面呈化学惰性且无催化活性。反应物流经涂覆催化剂的内通道，产物由外非催化通道排出。催化通道与非催化通道内均含有用于燃烧的燃料。该同心环形通道的内通道长度为5.0毫米，外通道长度为5.6毫米，内通道内径为0.8毫米，外通道外径为2.6毫米，催化剂层厚度为0.1毫米，壁面厚度为0.2毫米。内外通道的径向间距恒定为0.4毫米。除设计约束外，该系统可采用任意尺寸，且所有壁面厚度一致。与所有微型燃烧系统类似，该系统面临的核心潜在问题之一仍是燃烧稳定性。流体入口处的最大雷诺数小于360；当通道内流体流速达到峰值时，最大雷诺数为960。本模型采用商用软件FLUENT搭建以求解该问题，模型中纳入了详细化学反应机理。详细化学反应机理在燃烧化学动力学模型的开发中占据愈发重要的地位，本模型的反应流场同样引入了详细化学反应机理。均相燃烧过程采用CHEMKIN格式的甲烷氧化详细化学反应机理进行建模，模型中同时引入了SURFACE-CHEMKIN格式的详细非均相化学反应机理。燃烧过程涉及的基元反应速率由阿伦尼乌斯动力学表达式确定。采用详细化学反应机理的数值模拟通常计算成本高昂，这类详细化学反应机理往往具有刚性特征，因此其数值积分过程的计算开销极大。数据集贡献者：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，河南省焦作市世纪大道2000号，454000，中华人民共和国