一、锅炉概况谏壁电厂~#7—~#10炉均为SG—1000/170—M306型1000t/h亚临界压力一次上升直流锅炉,炉膛结构为单炉体双炉膛П型布置,该炉型的特点是:无汽包,采用强迫循环方式,即采用压差强迫循环,其水冷壁采用φ22×5.5、20A钢的小口径管,为了防止内壁局部汽化引起管壁超温,内壁采用内螺纹结构。由于水冷壁管径太小(内径仅11mm),容易引起堵塞。焊接时也容易因焊瘤而影响给水流量,以致造成管子长期或短期 First, the boiler overview Jianbi Power Plant ~ # 7- ~ # 10 furnace are SG-1000/170-M306 1000t / h subcritical pressure once the rise of the DC boiler, the furnace structure is a single furnace body double heart П arrangement, the furnace Type is characterized by: no steam bag, the use of forced circulation, that is forced circulation with pressure, the water wall with φ22 × 5.5,20 A small diameter steel pipe, in order to prevent partial wall vaporization caused by over-temperature wall, the wall within Thread structure. As the water wall diameter is too small (diameter of only 11mm), easily lead to blockage. Welding is also easily affected by welding and feed water flow, resulting in long-term or short-term pipe