ZHAO Huichuan1, SUN Biao1, YANG Hongquan2, et al. Current service situation and retrofitting advices for tubes on final superheater in supercritical boilers[J]. Thermal power generation, 2013, 42(1): 1-4.
ZHAO Huichuan1, SUN Biao1, YANG Hongquan2, et al. Current service situation and retrofitting advices for tubes on final superheater in supercritical boilers[J]. Thermal power generation, 2013, 42(1): 1-4.DOI:
超临界600MW机组锅炉末级过热器管材服役现状分析及改造建议
摘要
通过对国产第一代超临界600MW机组锅炉末级过热器T23、T91、TP347H管材服役现状的分析
得出蒸汽氧化是影响锅炉末级过热器管材安全稳定运行的主要因素。对此
提出了基于管材抗蒸汽氧化温度进行设计选材的升级改造建议:T23钢管最高使用壁温应控制在570℃以内
T91钢管最高使用壁温应控制在600℃以内
壁温600~640℃的管段应选用经过内壁喷丸处理的TP347H钢管或细晶TP347HFG钢管。
Abstract
The current service situation of such materials as T23
T91 and TP347H steel used for pipes on final superheater of the first generation domestic 600 MW supercritical boiler was analyzed.Steam oxidation was considered as the major factor that affect the safe and stable operation of the final superheater pipes.The principles for pipe upgrading was proposed:the highest wall temperature of T23 steel pipes should be lower than 570 ℃;that of the T91 steel pipes should be lower than 600 ℃;while for pipe segment where the wall temperature is between 600 ℃ to 640 ℃
the TP347H steel after inner shot peening or fine-crystalline TP347HFG steel should be used.Several advices on material selection for steam oxidation resistance temperature based pipe retrofitting were proposed.