Fans are widely used in various industrial sectors. Generally speaking, centrifugal fans are suitable for places with small flow and high pressure, while axial ventilation fan are often used for large flow and low pressure. Different types should be selected according to different situations. Fan classification.
1. Fan for boiler
The fan for the boiler can be centrifugal or axial according to the specifications of the boiler. According to its function, it is divided into boiler fan-conveying air into the boiler; boiler induced draft fan evacuates the flue gas in the boiler.
2. Fans for ventilation
This type of fan is generally used for ventilation and heating and ventilation in factories and various buildings. The pressure is not high, but the noise requirement is low. Centrifugal or axial fans can be used.
3. Fans for industrial furnaces (chemical iron furnaces, forging furnaces, metallurgical furnaces, etc.)
This kind of fan requires high pressure, generally 2940～14700N/m2, which is the range of high-pressure centrifugal fan. Due to the high pressure and the large circumferential speed of the impeller, the impeller must have sufficient strength during design.
4. Fan for mine
It has two types: one is the main fan (also known as the main fan), which is used to deliver fresh air to the well. Its flow rate is relatively large. The axial flow type is more appropriate, and the centrifugal type is also useful; Also known as local fan), it is used for ventilation of mine working face, its flow and pressure are small, and explosion-proof axial fan is mostly used.
5. Pulverized coal fan
Centrifugal fans are mostly used to transport pulverized coal in the boiler combustion system of thermal power stations. There are two types of pulverized coal fans according to different purposes: one is the storage pulverized coal fan, which blows the pulverized coal in the storage silo into the furnace from its side. The pulverized coal does not directly pass through the fan, and the exhaust of the fan is required. The pressure is high; the other is a direct blowing pulverized coal fan, which directly sends the pulverized coal to the furnace. As the pulverized coal wears severely to the impeller and the body shell, wear-resistant materials should be used.