When the impeller of the centrifugal fan of a boiler is rotated by the motor, the gas filled between the blades will rotate with the impeller, and under the action of centrifugal force, the gas will be thrown out of the slot between the blades. The gas is transported through the impeller outlet. When the outflow of gas creates a vacuum in the impeller space, the external gas automatically enters the impeller. Because of the continuous operation of the fan, the gas is sucked in and pressured, and the continuous flow of the gas is formed, thus forming the continuous operation.
The draft fan of the centrifugal fan of boiler will have no difference from the point of view of the fan. In operation, the fan page of the fan driven by the motor rotates to produce the wind, and there is no difference in essence. The role of the draft fan is determined by the location of their installation. The former is located at the back end of the boiler, blowing towards the flue outside the boiler, which produces negative pressure on the furnace and plays a guiding role on the flue gas.
Generally, the noise of blower and induced fan in boiler room is about 90 dB, because the flue gas temperature of boiler is as high as 180 ℃, the process arrangement of boiler room is kept unchanged through practice, and the blower and induced fan are placed separately in the sound insulation room. They are connected with the main engine by ventilation pipes, and air inlet is arranged on the top of the sound insulation chamber or on the wall, and a muffler is installed for the use of the air inlet in the engine room. In plane arrangement, the blower is near the boiler room side, the inlet is in the upper side, and the motor is placed in the middle of the airflow passage.https://www.jnblower.com/