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The boiler in our facility is undergoing a drying process. (Second baking after deactivation) Pressure retention is used to save energy. No special phenomena occurred during the holding period at pressures below 8. When the pressure was increased to 10 atmospheres, air leakage occurred at the manhole of the lower box. Because during the pressure holding period, there was also a slight leak and no immediate pressure relief was carried out. On the second day, red lumpy deposits appeared at the edge of the handhole. There are also shiny dry bubbles at the same time. It’s still brittle when pressed with a finger. Please analyze what components they are. You’ll get wealth if you answer correctly! ! !
Hehe, is it a compound or mixture formed by chemicals and iron? Edit: I guess I answered wrong; I thought it referred to a cooking stove. This post was last edited by Qin Yu on 2009-3-21 at 14:36.]
There must be iron, and H2O as well; I’m not sure what else is there
Fe(oH)3 and iron oxide, I guess
The red color is likely due to iron oxide and dirt
My judgment is that it’s an iron oxide mixture; removing it should be possible.
Our unit’s boilers have experienced this phenomenon: the shiny, dry bubbles resemble a gel-like substance, which is actually a mixture of salts and alkaline substances present in the boiler water. The red substance contains rust. Does your plant use flexible graphite composite gaskets for sealing the boiler access holes? I think you should test whether the quality of the boiler water exceeds the specified limits!
Reply to floor 10. Your answer is very correct. The red substance is rust. Shiny dry bubbles are a mixture of salt and alkali. Graphite gaskets are used as the shims. The slightly leaking steam caused the mixture and some of the graphite to be ejected. It dries under the heating of the junction box to form a shiny gel-like substance. The water quality remains within acceptable limits because there are few waste discharges during the pressure maintenance period. At the same time, the water circulation inside the boiler drum is essentially at a standstill, due to the formation of sludge.
The iron oxides carried away by the air leakage from the hand hole accumulate together
It should be the residues left after the evaporation of boiler water, such as Na3PO4, Fe(OH)3, Na2CO3, and so on