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过热器的作用是将从锅筒出来的饱和蒸汽加热成工艺要求温度的过热蒸汽,而锅筒里的锅水是pH值>7的弱碱性水,如果锅筒内的汽水分离装置设计不合理、制造、安装有缺陷,蒸汽会将锅水携带进入过热器受热面管子,逐渐浓缩成高浓度的碱性水,易引起碱腐蚀。如果锅炉在煮炉时,不慎将含有氢氧化钠、磷酸三钠药液的锅水带入过热器受热面管子,将很快引起过热器管子失效破坏。1锅炉及事故概况1)该锅炉型号为:QC2.35—10-1.57/250,为单汽包自然循环余热锅炉。电石尾气将热量依次传递给炉
The function of the superheater is to heat the saturated steam coming out of the drum into superheated steam at the temperature of the process requirement, whereas the pot water in the drum is a weak alkaline water with a pH value of> 7. If the design of the steam-water separator inside the drum is not designed Reasonable, manufacturing, installation defects, steam will be brought into the pot superheater heating surface tube, and gradually concentrated into a high concentration of alkaline water, can cause alkaline corrosion. If the boiler in the boiler, inadvertently containing sodium hydroxide, sodium trisodium phosphate liquid pot heating pipe into the heating surface, will soon lead to superheater tube failure failure. 1 Overview of Boilers and Accidents 1) The boiler model is: QC2.35-10-1.57 / 250, single drum natural circulation waste heat boiler. Calcium carbide exhaust heat will be passed to the furnace in turn