Burner Design And Numerical Simulation On The Heat Flow Field In Regenerative Oil Heating Furnace

As a kind of indirect heating device,water jacket furnace is widely used in oil and gas gathering and transferring system.Water jacket furnace in active use has problems about low heat efficiency and pollutant emissions due to the limitation of burner structure and operation mode.New regenerative combustion technology is a kind of ideal combustion technology for improving thermal efficiency and reducing the pollutant emission significantly.Regarding one 800 kW water jacket furnace as the research object,this paper has done regenerative reconstruction to burner,and studied the effects on temperature distribution,NO emission,thermal efficiency,etc.in the radiant tube,by using numerical simulation method.Based on response surface methodology(RSM),this paper has studied the effect of structural factors including the relative height(h)and relative radial distance(L)between fuel nozzle and the secondary air nozzles,the angle between secondary air nozzles(?)on temperature distribution and NO emission in the tube.The results showed that optimization burner structure parameters are:(h,L,?)=(96mm,130 mm,29o).In order to determine the effects of operation parameters,orthogonal experimental design was used to study the effects of factors including air-staged proportion,air preheat temperature and air excess ratio on NO emission.The results proved that furnace works at the optimizing condition when air-staged proportion 2:8,air excess ratio 1.05,and air preheat temperature 900°C.Considering the various working conditions,final furnace NO emission concentration was 18.0 ppm,which decreased 74.3%,while thermal efficiency increased 11.97%,reaching to 91.67%.