The Study Of Numerical Simulation Of Combustion And Heat Transfer In The WNS Gas-fired Boiler

With the proportion of nature gas in the energy structure constantly raised and environmental protection request enhanced, gas-fired boiler in the domestic developed quickly. Therefore, it is necessary to do a research to the combustion in the gas-fired boiler, which can be used to guide the designation and practical operation of the gas-fired boiler. The study of the combustion of nature gas, coke-oven gas and liquefied petroleum gas in the WNS gas-fired boiler will be done by the FLUENT software.During the study of numerical simulation of combustion in different working situations, the influence of factors to the temperature at furnace exit is showed through the numerical simulation of combustion of nature gas, coke-oven gas, and liquefied petroleum gas when the excess air coefficient respectively is 1.0, 1.1, 1.2 and 1.3. Finally, the appropriate working situation for practical operating gas-fired boiler is sure.During the study of numerical simulation of combustion in furnace at different thermal load, it showed that the temperature at furnace exit, temperature field, and velocity field and fuel concentration distribution can be controlled by adjusting thermal load through the analysis of temperature field, velocity field and fuel concentration distribution.During the study of numerical simulation of combustion at the condition of preheating air, the influence of preheating to the temperature at furnace exit and others is obvious.Through the analysis for the thermal state of smoke tube and tube plate and the environment where they are in, the reasons why smoke tube and tube plate are easily broken and prevention measures can be obtained.The result of the theoretical analysis can be used to guide the designation and operation of gas-fired boiler, which has definite application value.