Optimization The Full Premixed Burner Burning Tempered Air And Low Caloric Value Gas

The low calorific coal gas had lots of species,most of them were scattered distribution.The calorific value of low calorific coal is relatively low,which lead to lighting fire difficult and the flame is hard to stabilize during combustion.Besides,the fuel also had a viscous tar component that is likely to cause the burner to clog.All of these features limited the recovery and the use of low calorific value gas.In order to utilize the low calorific value gas well,in this paper,the optimal design of full premixed high speed jetting fu rnace was carried out,which would improving the gas utilization and avoiding the tar clogged for burner.This paper optimized the structure and operating parameters of the perforated plate burner,and got the variation regularity of combustion performance of burner when the structural parameters and operating parameters are changed.Firstly,high temperature air combustion technology was used to improve the furnace's energy utilization efficiency.When the temperature of air reached 450 ?,the furnace could save 20% of the fuel's usage.Under specific air temperature and fuel species,in order to made the furnace acquire production condition,this paper built the specific distribution scheme for the gas and the air.The one-dimensional laminar flame propagation model and one-dimensional turbulent flame propagation model of the combustion was created by mathematical derivation.The one-dimensional laminar flame propagation model was solved by Chemkin,and got the specific value of the laminar flame propagation velocity and the laminar flame thickness.With this two parameters,the turbulent flame propagation velocity could also been solved.And then,the length of flame could also been solved,too.And the length of the combustion chamber could easily been designed with these parameters.The value between the turbulent flame propagation velocity and the unburned gas is about 20m/s.And the stability of the turbulent flame propagation is good.Secondly,the structure parameters of combustor was optimized by Fluent,which using realizable k-? model and eddy dissipation model.Three parameters was optimized--length,pore diameter and pore shape.The single-variable research method was adopted to analyze the variation of the combustion's ignition position,pollutant emission,burning efficiency,under the variation of the specific parameter.Then choose the best value of each parameter to design new combustor.When the length of the burner was 45 mm,the structure of the pore was circular table,which had the taper of 1:15 and the smaller diameter is 4.5mm,the burner has the best performance.Finally,three operating parameters—the air temperature,the fuel species and the combustor's material,was also optimized by Fluent using the same method,and got the best value of each parameter for the combustor to operate.Come to the conclusion the mullite brick is the best material for the burner,and the burner could got best performance when working with the air temperature be 400?.The coke oven gas had the better burning performance than LAN carbon gas and generator gas.