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某机关生活用蒸汽锅炉为 KZL4-13型,工作压力为0.5MPa,已间断性运行8年,历次检验均未发现锅筒内壁有任何腐蚀现象,于1993年度检验时发现锅筒底部高温区域已形成严重坑状溃疡性腐蚀。(1)锅筒底部距前入孔100～150mm 处,锅筒内壁垂直中心线两侧各45°范围内,环向长1400mm,纵向长1900mm 区域内,发生严重溃疡状选择性区域腐蚀腐蚀面上蚀坑密布,大小由Φ10～25mm 不等,少数深6mm,蚀坑已经连在一起形成溃疡面。锅筒中环缝底面长1400mm 的焊缝上分布有15～18个腐蚀坑,深3～4mm。(2)在后管板高温区和部分烟管上,有少量深
An organ steam boiler for life KZL4-13 type, the working pressure of 0.5MPa, intermittent operation for 8 years, the previous inspection did not find any corrosion of the inner wall of the drum, found in the 1993 inspection at the bottom of the drum high temperature zone has been Serious crater-shaped ulcer corrosion. (1) At the bottom of the drum, 100 ~ 150mm away from the front entry hole, severe corrosion of the corrosive surface of the selective area occurs in the area of 45mm around the vertical center line of the inner wall of the drum, 1400mm in the ring direction and 1900mm in the longitudinal direction Etched pit dense cloth, the size of Φ10 ~ 25mm ranging from a few deep 6mm, pit has been linked together to form ulcers. There are 15 ~ 18 corrosion pits distributed on the weld of 1400mm length bottom of the ring barrel in the drum. The depth is 3 ~ 4mm. (2) a small amount of deep in the rear tube plate high temperature zone and some of the tobacco pipe