Causes of Ash Accumulation in Finned Tube
The presence of unburned carbon particles and ash in the flue gas when it reaches the air preheater(Air Heat Exchanger with Fin Tubes) , with the heat exchange, the temperature gradually decreases, when in the dew point temperature near the carbon particles and ash will adsorb the flue gas and play the formation of play and play's and then react with metal oxides to generate sulfite sulfate, but also with the outer wall of the heat pipe reaction, generating ferrous sulfate and iron sulfate, easily deposited in the heat pipe fins between the formation of ash scale .
Loose ash accumulation due to tiny dust unburned carbon particles and the existence of gravitational force between the heat pipe wall (dust carbon particles with an electric charge), they will be adsorbed on the heat pipe wall to form loose ash, this accumulation of ash is easier to blow off.
If the blowing is not timely or there is a lot of steam in the flue gas, it will cause the deposition of loose ash and eventually lead to the transformation of the ash scale form.
High-temperature ash accumulation heat pipe failure causes acidic corrosion medium formation in the atmospheric furnace fuel combustion, all contain a certain amount of sulfur.