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锅炉省煤器出口集箱上设置安全阀的主要作用是防止省煤器超压,保护省煤器。这对可分式省煤器尤其重要,因其制造材料一般选用灰铸铁,性脆不耐冲击。虽然在设计时考虑其出水温度控制在比锅筒饱和温度低40～50℃,以防止产生蒸汽,但实际上由于附属装置的不完善和操作上失当,有时还会产生汽化;另外给水泵有时也会夹抽进空气,这样在进水时容易产生水冲击,轻者会把弯头法兰撞松,重者使省煤器击破。为防止水击和汽化超压,除在出口处装设放空阀外,设置安全阀是保护省煤器的主要对策。有时由于操作失当,在给水泵开着的情况下关闭了省煤器出水阀,使其在给水泵全扬程下工作而导致超压破坏,这是省煤器需设置安全阀的另一个原因。
Boiler economizer outlet set on the safety valve set the main role is to prevent over-pressure economizer, protect the economizer. This is especially important for separable economizers because of the gray cast iron used in the manufacture of materials, impatience and impatience. Although the design of its control of the outlet temperature is 40 ~ 50 ℃ lower than the saturation temperature of the drum in order to prevent the generation of steam, in fact, due to the improper attachment and improper operation, and sometimes produce vaporization; In addition, the feed pump sometimes Will also be pumped into the air, so easy to produce water impact on the water, the light will bend the elbow flange loose, the more the economizer to break. To prevent water hammer and vaporization overpressure, in addition to the installation of vent valve at the exit, the installation of safety valve is the main countermeasures to protect the economizer. Sometimes due to misoperation, the water pump is turned off in the case of the economizer outlet valve to full head in the feed pump resulting in overpressure damage, which is the economizer to set the safety valve another reason.