Numerical Simulation Of Biomass Gas Reburning In 600MW Supercritical Tangential Boiler

The reburning of Biomass gas can reduce the fuel NOX generation and realize the efficient utilization of biomass energy,which has positive significance to control the pollution and reduce chemical energy consumption.With numerical simulation method,this paper took the 600 MW supercritical tangential boiler as the research object,studied the influence of biomass gas reburning on large capacity supercritical tangential boiler combustion performance and composition distribution under different load,then used the thermal calculation method in sections to complete thermodynamic calculation under reburning conditions and compared with the results of numerical simulation.The results show that when the boiler is under rated load and 75% load,biomass gas share was 15%,biomass gas reburning has less affected on the velocity distribution and the temperature distribution,meanwhile the boiler is under 50% load,reburning technology can improve the flame position and the boiler temperature field distribution;the NO emissions can be obviously decreased by biomass gas reburning.When the boiler is under rated load,75% load and 50% load,the removal rate of NO is 22%,23% and23%.The reburning condition calculation method is deduced on the basis of the in sections furnace thermal calculation,which provides ideas for calculation of the reburning supercritical coal-fired boiler flue gas temperature,it also provides reference to the biomass gas combustion performance of the large capacity supercritical coal-fired boiler under different load.