The oil fume purification system is composed of fan, smoke collecting hood, smoke exhaust pipe and oil fume purifier. The importance of fire smoke exhaust pipe to the whole kitchen smoke exhaust system is obvious. So, as such an important component, how to choose the material of fire smoke exhaust pipe?
At present, the commonly used materials of kitchen smoke exhaust pipes are stainless steel plate and galvanized steel plate. A layer of zinc is coated on the surface of the smoke exhaust pipe through the galvanized steel plate. Because zinc is more chemical than iron, zinc often oxidizes before iron, so as to protect the iron layer from damage. Stainless steel is alloyed with chromium and forms a very thin, firm, fine and stable chromium rich oxide film on its surface. This closely attached chromium rich oxide protects the surface and can prevent the continuous oxidation of oxygen atoms, so as to obtain corrosion resistance. It should be said that both have good anti rust ability.
In contrast, I suggest you choose stainless steel plate, so why? This should start with the composition of oil fume. The composition of oil fume is very complex, which is related to many factors, such as fuel type, edible oil type, ingredients, cooking time, cooking temperature, cooking method and so on.
There are more than 200 pyrolysis products of different kinds of edible oil at high temperature, including hydrocarbons, aldehydes, ketones, alcohols, hydrocarbons, fatty acids, aromatic compounds and heterocyclic compounds. Some products will combine with water to form corrosive substances such as nitrite, nitric acid and carbonic acid, which will inevitably corrode the smoke exhaust pipe when passing through the smoke exhaust pipe. Therefore, in addition to rust prevention, the material of smoke exhaust pipe should also have a certain degree of weak acid resistance.
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