Taking a 90t/h travelling grate boiler as the research object

the Fluent software was applied to simulate the flowing heat transfer and gas phase combustion in the furnace.The velocity field and temperature field in the furnace was obtained and the middle-upper part of the furnace was identified as the proper area for selective non-catalytic reduction(SNCR)denitration.Considering the furnace space is adequate

the ammonia injection point was located at the place of 5.7mhigh on the front wall and a total of 8ammonia injection points were regularly arranged along the width of the furnace.On this basis

numerical simulation on the SNCR denitration system was carried out.The results show that

under the condition with the ammonia spraying velocity of 40 m/s

the ammonia droplet diameter of 60μm

the molar ratio of NH3 to NO of 1.5and the total NH3 consumption of 0.002 58kg/s

the reaction between NH3 and NO was the most complete and the NO removal rate reached the highest

42.3%.