Problem of tube blockage in waste heat boilers
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After the waste heat boiler (fire tube) in our company’s waste acid recovery system had been in operation for some time, the system pressure drop increased. Upon shutting down the system for inspection, it was found that the furnace tubes were severely clogged; tests showed that the main substances causing this blockage were iron oxides and silicon oxides, with relatively high levels of nickel as well as Na and calcium. The furnace ash in the high-temperature section is relatively hard, while that in the low-temperature section is more viscous and adheres to the tube walls. May I ask how the experts handle this issue?
There is no other good solution for a clogged furnace tube – replace it. Additionally: Add a corrosion inhibitor during operation to prevent scaling.
Can the boiler design be changed? The interval between blockages is too short. As for whether this kind of furnace ash can be used in water-tube boilers
In my opinion, you first need to figure out what is causing the problem; otherwise, even after replacing it, the same issues will arise. Is the excessive amount of oxides due to too much oxygen in the furnace or low temperatures that lead to severe corrosion?
As for the regeneration of spent acid through cracking using fire-tube boilers, I have yet to see one that doesn’t get clogged