Temperature and reaction rate data with high exterior heat losses pertaining to catalytically supported thermal combustion in continuous flow reactors
Description
The temperature and reaction rate data with high exterior heat losses are obtained for catalytically supported thermal combustion in continuous flow reactors. Catalytically supported thermal combustion surmounts the mass transfer limitation. Sustained catalytically-supported thermal combustion occurs at a substantially lower temperature than conventional adiabatic thermal combustion. Combustion is no longer limited by mass transfer. The wall thermal conductivity and exterior convective heat loss coefficient are taken as independent parameters to understand how important thermal management is. The continuous flow 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 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 continuous flow reactor can have any dimension unless restricted by design requirements. All the walls have the same thickness. One of the potential problems associated with the reactor 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 continuous flow reactor. 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. Natural parameter continuation is performed by moving from one stationary solution to another. Contributor: Junjie Chen, E-mail address: koncjj@gmail.com, 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
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Steps to reproduce
The mathematical formalism developed to describe chemical kinetics and transport phenomena is implemented into ANSYS FLUENT. Numerical simulations are performed within ANSYS FLUENT.