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在中低压锅炉制造中,采用胀接的方法将管件与锅筒或管板连结起来,这主要是考虑不易损伤管孔、能够较方便地更换管子。但是胀口处的强度和严密性比用焊接方法连结的要差些。在锅炉运行中有时出现这样一种现象:锅炉的液位正常,水位报警装置灵敏,可是胀口却突然发生泄漏。经过调查了解和综合分析,胀口发生泄漏是由于快速升压造成的。 1 快速升压的实例一些单位的锅炉在使用中没有认真执行操作规程中关于点火升压的时间规定,致使锅炉升压的速度太快。如某台KZL4-13型锅炉,停炉三天完成检修任务后,于晚上8点开始点火,要求次日早晨7点半供汽。可是司炉工认为夜间不送汽,点火后就去睡觉,直至第
In the manufacture of medium and low pressure boilers, expansion joints are used to connect the pipe to the drum or tube plate. This is mainly because the pipe is not easily damaged and the pipe can be replaced more conveniently. However, the strength and tightness at the mouth of the bulge are worse than those obtained by the welding method. In the boiler operation sometimes appear such a phenomenon: the boiler level is normal, sensitive water level alarm device, but suddenly a bulging mouth leakage. After investigation to understand and comprehensive analysis, the occurrence of leakage is due to a rapid boost pressure. A rapid boost example Some units of the boiler in use did not seriously implement the operating procedures on the timing of the ignition boost, resulting in booster boost too fast. If a KZL4-13 boiler, shutdown the stove to complete the inspection task after three days, starting at 8:00 ignition, asking for fuel at 7:30 the next morning. However, the fireman believes that the night does not send steam, go to bed after ignition, until the first