How to choose the material for mining fans?
Mining fan manufacturers to transport high temperature gas fan the primary consideration of high temperature when the material changes, can not choose the general material. When the general temperature of carbon steel exceeds 300 ℃, its mechanical properties will drop sharply. Therefore, when the medium temperature is greater than 300 ℃, heat-resistant materials should be selected. When the medium temperature is greater than 700℃, high temperature resistant alloy steel should be selected, i.e. the steel containing nickel and chromium should be chosen.
In order to avoid accidents, the fan in the transport of flammable and explosive grade lower gas medium, the fan shell can choose steel, impeller can choose aluminum. In this way, when the aluminium impeller and steel shell collision or friction, there will be no sparks to form an accident. However, when the fan is transporting flammable and explosive grade gas media, the impeller and shell of the fan must be made of aluminium.
If the fan transport medium contains a certain amount of dust, sand or particulate matter, such as coal dust, sand and ash and similar substances, mining fan manufacturers if the use of general fans, it is necessary to install dust removal devices in front of the fan inlet, so that the dust content of the gas is less than 150g/m3. if the dust removal effect does not meet the requirements, or because the system planning requirements dust directly through the fan, should consider the use of wear-resistant fans.
Wear-resistant fans solve the problem of wear resistance of the blades first and foremost. In order to make the blade wear-resistant, in the blade surface carburization, spraying alumina or overlay welding tungsten carbide wear-resistant layer, in order to increase the use of impeller life.
The primary transport medium for corrosion resistant centrifugal fans is corrosive substances, such as acids, alkali, salts and other corrosive chemical gases. The primary problem of the fan is the corrosion resistance of the raw material. Generally, silicon iron alloy or aluminium alloy and ductile iron can be used, but also can choose the spray plating process.
Explosion-proof fans, as the fan transported gas media for carbon monoxide, LPG and chemical gas, the media contains flammable and explosive components. The rotor of this type of fan is made of general carbon steel material, mining fan manufacturers due to the collision between the parts or the absorption of impurities such as sand and iron filings in the rotor, sparks will occur, resulting in gas combustion and blasting, forming an accident.
When using the fan, you should pay attention to the selection of materials. If the selection is not appropriate, may occur blasting, equipment damage, endangering personal safety and other incidents.