基于响应面法的油田蓄热式加热炉燃烧器优化设计

为提高水套加热炉热效率,降低污染物排放浓度,设计适用于油田水套加热炉的蓄热式燃烧器,并确定最优结构参数。基于响应面法采用三因素五水平的中心复合试验设计和岭嵴分析方法,通过数值模拟分析加热炉燃烧器燃料气喷口与二次空气喷口之间相对高度、二者之间径向距离和二次空气大直径喷口间夹角三因素对辐射管内NO浓度的影响机制,确定燃烧器最优结构参数。结果表明:二次空气大直径喷口间夹角的变化对响应值的影响最为显著,较小的夹角能够获得更均匀的温度分布和更低的NO排放浓度(体积分数);采用优化后燃烧器的加热炉NO浓度明显降低,理论热效率也有一定提高。数值模拟结果与建立的响应函数模型预测值基本一致,采用响应面法优化水套加热炉蓄热式燃烧器结构的方法是可行的。

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

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.