Study On Characteristic Simulation And Application Of Methanol Catalytic Combustion

Methanol is a clean fuel.Compared with traditional flame combustion,catalytic combustion has the characteristics of high efficiency,low pollution and safety.Combining clean fuel methanol with catalytic combustion can effectively improve fuel utilization and reduce pollutant emissions.In addition,due to its technical characteristics,this heating technology is also very suitable for special buildings without open fire and low pollution requirements.In order to deeply explore the characteristics of methanol catalytic combustion,the effects of operating parameters and structural parameters on methanol catalytic combustion were studied by numerical simulation.A catalytic combustion methanol heat generator for heating was designed,and the effect of relevant parameters on its performance was investigated.At the same time,the economy of the heat generator was analyzed.Firstly,a single channel model was established to investigate the effects of operating parameters including inlet concentration,inlet flow rate,and inlet temperature under adiabatic conditions,as well as structural parameters including pore shape,length,and diameter on methanol catalytic combustion.The results show that the temperature field and concentration field of the reaction will change regularly with the change of operating parameters.Increasing the inlet concentration and temperature,and reducing the inlet speed can improve the methanol conversion.The structure parameters also have a significant impact on the reaction.The methanol conversion can be improved by using triangular channels or increasing the channel length and reducing the pore size.Secondly,the model of the integrated reactor is established and compared with the single channel model.It is proved that the calculation results of the single channel model under adiabatic conditions can represent the integrated reactor model.When there is heat transfer outside the reactor,the single channel model is no longer applicable and the integral reactor model needs to be used.On this basis,the effects of external heat transfer coefficient,catalyst matrix material,reactor tube diameter and tube length on the reaction were investigated.The results show that the change of heat transfer coefficient leads to the change of temperature field in the reactor,which affects the reaction rate of methanol catalytic combustion.The main influencing factor of the catalyst substrate material on the reaction is the thermal conductivity of the material;Heat exchange area,reaction heat,and radial thermal resistance are the main factors affecting the reaction.The main factors affecting the reaction are the heat exchange area and the catalytic reaction area of the reactor.Finally,a methanol heat generator based on catalytic combustion was designed,and the effects of four parameters,namely fuel inlet concentration,catalytic substrate material,heat generator power and working medium inlet speed,on the performance of the heat generator were investigated,and the economy of the heat generator was analyzed.The results show that stainless steel is more suitable to be used as the catalytic substrate material of the heat generator;The fuel inlet concentration,heat generator power,and working fluid inlet speed all have a significant impact on the performance of the heat generator,and each has a limit value.The economic analysis shows that the methanol catalytic combustion heat generator has superior economic efficiency,and also has significant advantages in the emission of nitrogen oxide pollutants.