Centrifugal fan have a wide range of uses. We need to select different centrifugal fans according to the nature of the gas being transported. When the dust concentration of clean air or dust-containing gas does not exceed 150mg/m3, general centrifugal fans can be selected. When transporting corrosive gases, it is necessary to use anti-corrosion centrifugal fans, and when transporting flammable and explosive gases, explosion-proof centrifugal fans are required. In the case of gas with high dust content, it is necessary to use a dust exhaust centrifugal fan. When choosing a specific centrifugal fan model and specification, it must also be determined according to the performance table or characteristic curve on the centrifugal fan product sample.
It is also necessary to take into account the possible air leakage in the piping system, resulting in an inaccurate calculation of resistance. In order to ensure reliable operation, the air volume and air pressure of the centrifugal fan should be greater than the air volume and air pressure calculated by the ventilation system. According to the selected air volume L 'Air pressure H', select the type of centrifugal fan on the product sample of the centrifugal fan, and determine the machine size, speed and motor power of the centrifugal fan.
In order to facilitate the connection and installation, it is necessary to select the appropriate fan outlet position and transmission mode. The selected working point of the centrifugal fan should be within the economic range. 105 Pa, temperature of 20 ℃, relative humidity of 50%) performance parameters, if the actual operating state is not the standard state, the actual performance of the centrifugal fan will change (except air volume).
Therefore, when selecting a centrifugal fan, the parameters in the actual operating state should be converted into the parameters in the standard state, unless any centrifugal fan can not meet the requirements, or the wind pressure and air volume of the fan are required to change greatly during use. Otherwise, try to avoid using two or more centrifugal fans in parallel or in series, because when two or more fans work together, the role of each centrifugal fan will be worse than when it is used alone.