论文部分内容阅读
闵行电厂8、9号炉是上海锅炉厂1971年和1972年的产品,根据煤油两用的方案设计。炉膛设计高度较低,炉膛容积比燃烧煤的锅炉容积小得多,故炉膛热负荷很高,达到182×10~3kcal/m~3·h,以致屏式过热器处的烟温高达1100～1200℃,并使高温氧化和高温腐蚀对屏式过热器的管子和管夹产生了严重的危害,尤其是对屏式过热器的管夹,氧化和腐蚀更为严重。使用时间达不到一个大修周期,甚至连一个小修周期也很难维持,其中后屏过热器的管夹高温氧化和腐蚀使中间管吊架全部烧断,管夹大部分烧蚀脱落。由于管夹、管吊架烧蚀断裂后,使中间弯头自由落下,碰磨后墙折烟角水冷壁管,管圈任意变形,中间管圈自由移动至外圈保护管的外侧,内圈管得不到外圈管的保护(内圈管的材料为10CrMo910,外圈
No. 8 and No. 9 furnaces of Minhang Power Plant are the products of Shanghai Boiler Works in 1971 and 1972, and are designed according to the dual-use of kerosene. The furnace design height is lower, the furnace volume is much smaller than the boiler burning coal, so the furnace heat load is very high, reaching 182 × 10 ~ 3kcal / m ~ 3 · h, so that the smoke temperature of the screen superheater up to 1100 ~ 1200 ℃, and the high temperature oxidation and high temperature corrosion of the screen superheater tube and pipe clamp had a serious hazard, especially for the screen superheater pipe clamp, oxidation and corrosion more serious. The use of time less than an overhaul cycle, and even a minor repair cycle is difficult to maintain, including post-screen superheater tube clamp high temperature oxidation and corrosion of the middle pipe hanger all blown off most of the pipe clip off. As the pipe clip, pipe hanger ablation fracture, so that the middle of the elbow free fall, after grinding friction wall angle of the water wall pipe, pipe deformation, the free movement of the middle of the outer ring to the outer tube protection tube, the inner ring Tube can not get the protection of the outer tube (Inner tube material is 10CrMo910, outer ring