Corrosion and leakage prevention issues for the partition walls in phosphatic ammonium fertilizer exhaust gas systems
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Dear experts, please help me analyze this: Our company plans to upgrade the exhaust gas treatment system used in the production of ammonium phosphate. The walls of the dust collection chamber are made of hollow bricks, and the temperature inside is high, sometimes exceeding 100 degrees. In the past, we used glass fiber sheets to separate these walls from the hollow brick structure, but after a few months of operation, severe corrosion and leakage problems occurred in those partitions. Do you have any other suggestions for materials that can withstand high temperatures, as well as the corrosion caused by ammonium phosphate exhaust gases, and that are also resistant to leakage? Thank you!
What is a temperature of over 100 degrees? Let me see if I can come up with a solution!
Under normal conditions, it’s 70/80 degrees
During start-up and shutdown, when there is no material present, the temperature reaches around 120 degrees
During start-up and shutdown, when there is no material present, the temperature reaches around 120 degrees
Acid-resistant tiles lined with siliceous clay are used to replace the original corrosion prevention method of hollow bricks lined with fiberglass.
This post was last edited by Anhui Dabang Anti-corrosion on 2015-12-1 at 12:50: Exhaust gas collection, filtration, and emission system.
It’s not practical to remove the hollow brick walls, as the entire framework of the building is made up of such walls. Is there any good anti-corrosion material that can be used to line these walls, one that won’t peel off in high temperatures and that can also provide protection against corrosion?
What are the main media used in the phosphoric acid ammonium fertilizer exhaust gas system? Could you introduce it? The substrate is a brick wall, with a maximum temperature of 120°C. How large is it? It would be best to know the main media in the phosphoric ammonium exhaust system, so as to choose the appropriate materials. The preliminary plan involves using a polymer fiber coating. Construction is convenient and fast. This type of coating is generally used for the anti-corrosion of absorption towers, flues, and chimneys in power plant desulfurization and denitrification systems. But it also depends on the medium.
The wall is made of hollow bricks with a mortar coating on the outside; when exposed to heat, the coating tends to peel off. The main material used is a thermophosphoric ammonium slurry with an acidic pH of around 4