Is the Roots blower a induced draft fan
Roots blower is not a induced draft fan. The following are the specific differences between Roots blower and induced draft fan:
1、 Definition and purpose
1. Roots blower:
Definition: Roots blower is a type of positive displacement blower invented by the American Roots brothers, hence its name. It uses two or three leaf shaped rotors to make relative motion inside the cylinder to compress and transport gas.
Usage: Mainly used for transporting gas or inhaling, commonly used in industrial production for transporting substances such as dust and gas. Widely used in fields such as sewage treatment, water treatment, mining, and chemical engineering.
2. Induced draft fan:
Definition: Induced draft fan is a device that generates negative pressure through the rotation of the impeller, and then extracts air from the system (equipment).
Usage: It is usually installed at the front end of the system or the tail end of the boiler, used for conveying air or flue gas, especially for extracting hot flue gas from the furnace in the boiler system.
2、 Working principle
1. Roots blower: The air inlet is separated by the engagement of a pair of rotors (with a gap between the rotors but not in contact with each other). The rotor is driven by a pair of synchronous gears and moves in the opposite direction, pushing the inhaled gas from the intake port to the exhaust port without internal compression.
2. Induced draft fan: By driving the impeller to rotate through a motor, an airflow is generated, creating negative pressure and extracting air or smoke from the system.
3、 Structure and Characteristics
1. Roots blower:
Structure: It mainly consists of two leaf shaped rotors, cylinders, synchronous gears, etc.
Features: It has the characteristic of forced gas delivery, the air volume delivered is proportional to the number of revolutions, low noise, and reliable operation.
2. Induced draft fan:
Structure: Mainly composed of impeller, motor, casing, etc.
Characteristics: Depending on the usage scenario, induced draft fans may use different materials and design techniques. For example, wear-resistant fans use new fan design techniques and ceramic metal composite manufacturing techniques.
4、 Other differences
1. Power and control: Roots blowers usually use frequency conversion control, which can achieve more accurate air volume and pressure control. The induced draft fan generally adopts traditional resistance speed regulation.
2. Maintenance cost: The Roots blower adopts contactless operation, reducing the use of vulnerable parts such as bearings and mechanical seals, thereby reducing maintenance costs and failure rates.
In summary, there are significant differences between Roots blowers and induced draft fans in terms of definition, purpose, working principle, structural characteristics, and other aspects. Therefore, in practical applications, it is necessary to choose the appropriate type of fan according to specific requirements.
