Numerical Simulation And Experimental Study Of SNCR In City Life Garbage Furnace

In this article,through the combination of numerical simulation and experimental study methods,relying on the 12 th five-year plan of national science and technology support plan of tasks,researching the combustion process of 700 t/d garbage furnace and SNCR denitration process,a thorough understanding of the grate type incinerator combustion and denitration characteristics.Firstly,through numerical simulation of thermal state obtain the temperature field,velocity field and discrete phase distribution,and through post-processing to obtain the distribution of furnace NO_x.At the same time explore the secondary air volume,boiler load change and the impact of garbage residence time of flue gas temperature,analysis the variation of the temperature and quality of bed particles,then statistics the garbage furnace burning rate.The results showed that: After increase secondary air volume,the furnace exit CO₂ concentration and smoke temperature decreases;under high load operation,boiler furnace of CO₂ and flue gas temperature is increased,decreased O₂ and CO concentration;there are more suitable residence time of 80 min,which can maintain the high smoke temperature in the same time.;bed temperature in garbage particles bed high direction gradually rise,show the characteristics of the garbage incinerator single firing;quality of large size particles changes more than the quality of small particle size;garbage incinerator overall burning rate is about 88%,volatile precipitation begin to raise at 2 m grate length and coke began to burn at 3 m,ash export location of coke burning rate is about 82.87%.Then,intercept elevation Y=14.65 m cross section and import the boundary conditions into a new model.,combined with the components of transport model of vortex dissipation model to simulate the garbage furnace SNCR denitration numerical simulation.Investigated the ammonia nitrogen ratio,atomized particle size,atomizing angle,jet velocity and jet angle affect denitration rate,the conclusion is: ammonia nitrogen ratio is higher,the denitration rate is higher;when the atomized particle size is 500 ?m,denitration rate reached 66.23%;The atomization angle increases,the denitration rate is decreased;jet velocity increased from 15 m/s to 40 m/s,denitration rate increased by 4.83%;spray gun downward sloping appropriate help to extend the reductant in the retention period of furnace,denitration rate can be improved.Finally,experimental study on the garbage furnace for the SNCR denitration,getting the temperature distribution of each measuring point.SNCR spray gun is arranged at the elevation of 20.0 m,the arrangement of the front wall and the left and right sides,the denitration rate is 52.36%.