Questions about dry-method boiler maintenance
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The desiccant method involves, after the boiler is shut down and the temperature of the boiler water drops to 100–120°C, draining all the water from the boiler. The residual heat inside the boiler is then used to dry the metal surfaces, as well as to remove scale and sediment accumulated in the boiler’s water system. Then, a desiccant is placed inside the boiler to keep the metal surface dry and prevent corrosion. The above information is taken from the methods of dry maintenance. My question is: My plant uses a fire-tube type waste heat boiler, and the rising tubes inside the drum extend to the middle of the drum, which makes it impossible to drain all the water from the drum; in other words, it’s not possible to use the waste heat to dry everything completely. How should the drying method be applied in this situation? If long-term maintenance is done using wet methods, which one is simpler?
Is there no other method besides “waste heat drying”? From a philosophical standpoint, wet long-term maintenance is certainly inferior to dry method, but the operating level required for the dry method is much higher.