锅炉给水加氧对奥氏体管汽侧氧化皮形成剥落的影响.pdfVIP

锅炉给水加氧对奥氏体管汽侧氧化皮形成剥落的影响 蔡晖 ，唐丽英，殷尊 西安热工研究院有限公司，西安市兴庆路136 号，710032 Effects of becoming and peeling of boiler feed water plus oxygen to form on austenitic pipe steam side oxide CAI Hui, Tang liying, Yin Zun Xi’an Thermal Power Research Institute, Xi’an 710032, Shaanxi Province, China ABSTRACT: It was studied on final superheater 剥落的影响和规律，对某电厂1、2 、3、4 号炉 and reheater tubes operated on different time of a power 在不同的加氧方式下的末级过热器和末级再热 plant in different ways plus oxygen samples by means of the 器的TP347H 管样进行了管内壁氧化层对比分析 microstructure analysis, grain size measurement, internal 研究，主要研究加氧对于内壁氧化层微观组织和 oxide layer metallurgical analysis, typical SEM and EDS 剥落倾向的影响。 analysis of the structure of the inner wall of the oxide layer. 该电厂4×600MW 超临界机组锅炉为北京巴 The results showed that plus oxygen promoted the formation of the outer tube wall Fe2O3 oxide layer; the final 威公司按美国BW 公司SWUP 系列锅炉技术标 reheater tubes of a plus oxygen boiler had been the most 准设计，过热器出口蒸汽压力25.40MPa 、571℃； serious oxidized ，meanwhile, there was the most fine 再热器出口蒸汽压力4.526MPa 、569℃；末级过 grain-free zone in the inner wall of these tubes. One of the 热器位于折焰角上方，沿炉宽方向共有 72 屏， main reason for its earlier peeling occurs was to fail to form 横向节距为 300mm，每屏分前后两部分、共由 a uniform continuous inner wall Cr-rich oxide layer, and it 10 管圈并绕，把出口段管束夹在中间，材料 was plus oxygen that lead to oxide layer shedding. TP347H 、T91 ，规格为 Φ42×6.5(7.5)mm。末级 KEY WORDS: Boilers; plus oxygen; inner wall; 再热器由进口和出口两个管组组成，出口管组由 Cr-rich oxide layer; shedding 摘要：本文针对某电厂末级过热器和再热器锅炉 Φ51×4mm 的TP347H 组成，横向节距225mm ， 管在不同的加氧方式下所取的不同时间段管样进行了管 沿炉宽方向共有97 屏，每屏