Numerical Analysis of Reaction for Catalytic Combustion. Reaction Model Dependent on Temperature for Natural Gas.

Abstract

New analysis model for catalytic combustion of natural gas in honeycomb was developed. In the new model heat of reaction, thermal radiation, heat conduction, and heat transfer were taken into consideration and temperature dependent reaction model based on the evaluation of catalytic activity was introduced. With the new model numerical analyses were performed to explain the effect of fuel consumption rate, air excessive ratio, diameter of honeycomb cells, axial length of honeycombs and base materials of honeycombs on the characteristics of catalytic reaction. The results prove the propriety of the new model and clarify the effect as follows. (1) The axial position of maximum catalyst temperature shifts dependent on the fuel consumption rate and air excessive ratio. (2) The axial temperature profile of catalyst and burning rate were controlled by the most suitable selection of the diameter of honeycomb cells, axial length of honeycombs. (3) The conductivity of base material has much influence on the characteristics of thermal radiation and heat conduction.