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一、前言我厂装有上海锅炉厂制造的两台50412型400t/h锅炉,分别于1980年9月和1981年7月投运。该型锅炉由于尾部受热面设计烟速偏高,结构布置不尽合理等原因,致使低温再热器(以下简称低再)受热面磨损严重。两台锅炉自投运以来,承压部件已发生了多次泄漏及爆管,据统计:水冷壁发生6次,过热器7次,省煤器8次,低温再热器11次,其中低再发生的故障占“四管”故障的30％以上。另外从四管发生泄漏爆管的性质来分析,除低再
I. Preface Our factory is equipped with two 50412 type 400t / h boilers manufactured by Shanghai Boiler Works and put into operation in September 1980 and July 1981 respectively. This type of boiler due to the tail of the heating surface design of high smoke speed, structural arrangement is not reasonable and other reasons, resulting in low temperature reheater (hereinafter referred to as low again) heating surface serious wear and tear. Since the two boilers put into operation, the pressure parts have been leaks and burst pipe many times, according to statistics: water wall occurred 6 times, superheater 7 times, economizer 8 times, low temperature reheater 11 times, of which low Recurring failures account for more than 30% of the “four-tube” failures. In addition, from the four pipe leak burst pipe to analyze the nature, except low again