Optimization design of oilfield regenerative heating furnace burner based on response surface method

Key words:  response surface method  numerical simulation  structural optimization  regenerative burner  NO_x emission

Abstract:

In order to improve the thermal efficiency of the jacket heater and reduce the pollutant concentration, it is aimed to design a regenerative burner which is suitable for water jacket furnaces, and the purpose is also to determine the optimal structural parameters. Based on the response surface method (RSM) with the central composite design (CCD) of 3 factors and 5 levels and in combination with the ridge analysis method, the numerical simulation was carried out. The relative height, radial distance between the fuel nozzle and secondary air nozzle and the spray angle of secondary air nozzles on the NO emission of the burner were analyzed, then the optimal structural parameters can be obtained. The result shows that the variation of the angle of secondary air nozzles has the most significant effect on the responsive values, and the smaller angle can reach more homogeneous temperature distribution and lower NO emission concentration (volume fraction). It is also found that the NO emission concentration of the burner has been reduced greatly after optimization, and the theoretical efficiency is also enhanced. It indicates that the numerical simulation is consistent with the RMS model result, and the route to optimize the structures of the regenerative burner in the jacket heater is possible to realize.