双炉膛炉内空气动力场的数值模拟研究

A Numerical Simulation Study of Aerodynamic Field Characteristics in a Double Furnace

本文对１０００ｔ／ｈ直流炉单炉体双炉膛的炉内空气动力场进行了数值模拟研究。数值模拟预示结果与现场实际测量结果基本一致。分析认为切向燃烧方式中，直流燃烧器前后墙矩形布置是造成烟气冲刷水冷壁的主要原因，一次风喷口高而窄、二次风喷口扁而宽是一二次风分离的主要原因，进而产生水冷壁烟侧高温腐蚀。

A numerical simulation study is conducted of the aerodynamic field characteristics of a 1000 t/h once through boiler double furnace.The results of the simulation study basically agree with the measured results on site.Through analysis it is shown that the front and rear wall rectangular arrangement of impellerless burners in a tangentially fired furnace constitutes a major cause of the water walls being swept by flue gases.The separation of primary air and secondary air can be mainly attributed to a high and narrow primary air nozzle and a thin and wide secondary air nozzle,resulting in a high temperature corrosion of the water walls on the gas side.