我厂DHF8—39/450沸腾炉,自1997年1月投运以后,因燃料、操作等原因,一直不能正常运行,平均每周至少停炉一次。点火时,炉料外喷,常引起点火枪皮管爆裂、着火;抽枪时,红料也易飞溅伤人,威胁操作人员的人身安全,操作环境极差。抽枪、关闭炉门时,炉温下降较快,操作条件变化较大,操作困难,点火成功率仅有60％,时间也长,每次都在90min左右。 为保证锅炉的正常运行,决定对点火结构进行改造,改造前后结构参见图1、图2。根据沸腾炉的结构特点,在炉门下方增设三根φ57mm×3.5mm钢管,改弯枪点火为直枪点火。钢管水平中线要求与风帽表面有50～70mm的距离,以利于底料的加热, I plant DHF8-39 / 450 boiling furnace, put into operation since January 1997, due to fuel, operation and other reasons, has been unable to operate normally, the average shutdown at least once a week on average. Ignition, the charge outside the spray, often caused by point pipe burst skin fire, fire; pumping gun, the red material is also easy to splash wounding, threatening the personal safety of the operator, the operating environment is extremely poor. Lifting the gun, the furnace door closed, the furnace temperature dropped rapidly, the operating conditions changed greatly, the operation is difficult, the ignition success rate of only 60%, the time is long, each time in about 90min. In order to ensure the normal operation of the boiler, it is decided to rebuild the ignition structure, see Figure 1 and Figure 2 before and after the transformation. According to the structural characteristics of the boiling furnace, an additional three φ57mm × 3.5mm steel pipe below the door, turn the gun firing gun fire. Steel pipe horizontal centerline requirements and hood surface 50 ~ 70mm distance, in order to facilitate the end of the material heating,