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我局一台HG—220/100-5型锅炉在1985年大修检查发现汽包内壁3号环焊缝处有可见裂纹,省煤器再循环管靠汽包内壁管孔处有放射裂纹。汽包由封头和四节简身组成,材质19Mn5,壁厚90mm,有4条纵焊缝,5条环焊缝。省煤器再循环管开孔位置距汽包底部116mm且紧靠3号环焊缝,孔径65mm。该炉投产至本次大修累计运行约8万小时。一、裂纹分布情况经检查,3号环焊缝裂纹总长约1200mm,主裂纹长350mm,分布在靠近省煤器再循环管孔侧的焊缝热影响区上。以管孔中心为界,靠炉前侧主裂纹长约100mm,炉后侧主裂纹长约250mm,裂纹最深处达15.8mm。如图所示。
I Bureau of a HG-220 / 100-5-type boiler overhaul in 1985 found that there are visible cracks in the No. 3 ring weld at the inner wall of the drum, and the economizer recycle pipe has radiation cracks on the inner wall of the drum. Drum from the head and four simple components, material 19Mn5, wall thickness 90mm, there are 4 longitudinal welds, 5 ring weld. Economizer recycle pipe opening location 116mm away from the bottom of the drum and close to the No. 3 girth weld, bore 65mm. The furnace put into operation over the cumulative operation of about 80,000 hours overhaul. First, the crack distribution After inspection, No. 3 girth weld crack length of about 1200mm, the main crack length 350mm, located near the economizer heat pipe weld side of the heat affected zone. Taking the center of the tube hole as a boundary, the main crack near the front of the furnace is about 100mm long, the main crack length about 250mm behind the furnace, and the deepest crack reaches 15.8mm. as the picture shows.