Based on the different methods of gas compression, blowers can be divided into three main types:
Centrifugal Blowers: These compress gas by using centrifugal force generated by the rotation of an impeller, suitable for medium to high-pressure applications. A multi-stage centrifugal blower used in a sewage treatment plant, with four impellers in series, can increase the air pressure to 100 kPa, used in deep-water aeration systems. Its advantage lies in stable flow rate, but it has operating limitations due to surge conditions.
Roots Blowers: These use two "figure-eight" shaped rotors to transport gas, belonging to the positive displacement type of machinery. A three-lobe Roots blower used in a cement plant, with a rotational speed of 980 rpm, has a discharge volume of 60 m³/min, making it particularly suitable for dusty environments. Its outstanding feature is that the flow rate is strictly proportional to the rotational speed, but it produces significant pulsating noise.
Axial Flow Blowers: Gas flows axially, suitable for high-flow, low-pressure applications. An axial flow fan used in a power plant's cooling tower has a diameter of 8 meters and an airflow exceeding 1000 m³/s, reducing energy consumption by 18% compared to traditional models. New adjustable blade technology allows it to maintain high efficiency under varying operating conditions.
