Numerical Simulation Of Reburning Of Biomass Gas In 660MV Lignite Opposed Firing Boiler

Biomass gas reburning effective to reduce formation of NOx pollutants and efficient utilization of biomass energy,pollution control,and to reduce the consumption of fossil energy are of great significance.In this paper,the 660 MW lignite opposed firing boiler of a power plant is taken as the research object.The FLUENT software is used for numerical simulation.The effect of graduated material gas reburning on the combustion performance of large-capacity boiler under different loads and the distribution of smoke components.The thermal calculation of reburning conditions was carried out by means of segmental thermal calculation and compared with numerical simulation results.The results show that:(1)When the boiler is under rated load and 75% load,the gas reburning has little effect on the velocity field and temperature field of the furnace,and the distribution is roughly the same.The removal rate of NO under reburning conditions is 20% and 21%,respectively;(2)When the boiler is at 50% load,the reburning technology increases the flame position and effectively improves the boiler temperature distribution.The removal rate of NO reached 18% under 50% load.(3)Based on the segmental thermal calculation,the segmental thermal calculation method for reburning conditions is derived,which provides ideas for the calculation of the flue gas temperature of the lignite boiler in the reburning condition,and simultaneously produces different loads for the large-capacity coal-fired boiler in the future.Provide reference for the reburning combustion performance of material gas.