Meshes and flow fields for the optimum design of autothermal reactors with different flow channel shapes

The meshes and flow fields are illustrated from an autothermal reactors with different flow channel shapes, which can simultaneously carry out exothermic and endothermic reactions in separate flow channels and simultaneously adjust feed composition and flow rates. The state-of-the-art approach for optimizing the heat balance in endothermic processes requires a complex network of reactors and heat ex-changers for heating up the feed, for supplying the heat to the endothermic reaction at the required temperatures and for utilizing the sensible heat of the hot reactor effluents. The flow channels form a variety of cross-sectional shapes ranging from square to ellipse. Corners of the flow channels can be rounded off. Specifically, the cross-sectional shape of the flow channels is defined as follows: an ellipse within a circle, a circle within a larger circle, fillets formed in the corners of a square, a circle within a square, and a square within a larger square. The cross-sectional shape of the flow channels can be defined by means of a number of geometric parameters. A methanol-steam mixture is supplied to the reforming channels to be reformed, and a methanol-air mixture is supplied to the combustion channels to be combusted. The temperatures and pressures of the two streams entering the combustion channels and the reforming channels, respectively, are the same. The temperature of the two streams is 373 degrees Kelvin at the flow inlets. The system operates at a pressure of up to 1.5 megapascals. Typically, high pressure combustion is widely practiced. Although a stoichiometric ratio of fuel to air is sufficient, an equivalence ratio of 0.8 is employed. A steam-to-carbon molar ratio of 1.4 is employed. The fluids flow essentially parallel to the axes of the channels. The velocity of the fluid flowing into the reforming channels is 2.0 meters per second at the flow inlets. In contrast, the velocity of the fluid flowing into the combustion channels varies depending on the desired design requirements. To obtain the solution of the problem, numerical simulations are performed using fluid mechanics.
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

本数据集包含不同流道形状的自热反应器（autothermal reactors）的网格模型与流场数据。该类反应器可在独立流道中同时进行放热与吸热反应，并可同步调节进料组成与流量。当前优化吸热过程热平衡的主流方法，需要构建复杂的反应器与换热器（heat exchangers）网络，用于预热进料、为吸热反应提供所需温度下的热量，并回收热反应器出口物流的显热（sensible heat）。该数据集的流道具有多种截面形状，涵盖方形至椭圆形，流道拐角可进行倒圆角处理。具体而言，流道截面形状包括以下类型：圆内椭圆、大圆内嵌小圆、方形拐角倒圆角、方形内嵌圆、大方块内嵌小方块。流道截面形状可通过若干几何参数进行定义。将甲醇-水蒸气混合物通入重整流道进行重整反应，将甲醇-空气混合物通入燃烧流道进行燃烧反应。进入燃烧流道与重整流道的两股物流的温度与压力均保持一致，入口温度均为373开尔文。该系统的运行压力最高可达1.5兆帕，通常采用高压燃烧工艺。尽管燃料与空气的化学计量比（stoichiometric ratio）即可满足需求，但本数据集采用当量比（equivalence ratio）为0.8的工况，同时采用水碳摩尔比（steam-to-carbon molar ratio）为1.4的配置。流体流动方向基本与流道轴线平行，进入重整流道的流体入口流速为2.0米每秒；而进入燃烧流道的流体入口流速则可根据设计需求灵活调整。为求解该问题，本数据集采用流体力学（fluid mechanics）方法开展数值模拟（numerical simulations）。

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