水平浓淡风煤粉燃烧器调节特性的数值模拟及工业性试验研究

采用近流线数值计算方法,对具有复杂喷嘴形状的水平浓淡风燃烧器在四角切圆流场中一次风射流的刚性进行了详细的数值模拟计算,并结合在300MW四角切圆煤粉燃烧锅炉上的应用和工业性试验研究,得出了通过调节侧二次风与一次风的动量比,来调节一次风射流刚性、控制一次风射流的偏斜,进而改善炉内燃烧两相流场、水冷壁壁面附近的烟气气氛,同时实现了防水冷壁高温腐蚀,提高了煤粉的着火、稳燃的燃烧性能的结论。

NUMERICAL SIMULATION AND INDUSTRIAL EXPERIMENTAL STUDY OF THE REGULATION CHARACTERISTICS OF HBC-SSA BURNERS

In this paper, a new closed to streamline numerical simulation method has been developed. With this method, numerical study has been performed in detail on `rigidity' of primary air jet in three dimension tangentially fired aerodynamic field of a furnace in which the complicated structural horizontal bias combustion pulverized coal burners with side secondary air nozzle(HBC-SSA burners)were used. In the mean time,mdustrial experimental study of the HBC-SSA burner has been carried out in a 300MW tangentially fired boiler of a large power plant. Through this experimental study and numerical research, it has been proved that the HBC-SSA burner can regulate the `rigidity' of primary air jet, control the deflection of primary air jet, improve the combustion two-phase flow filed in furnace and gas ingredients near the water-cooled wall by way of regulating the ratio of SSA dynamic pressure and the primary air dynamic pressure. It was demonstrated that the HBC-SSA burner can strongly resist water-cooled wall high temperature corrosion, improve the performances of pulverized coal ignition and flame stabilization.