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Working principle and Application requirement of Boiler centrifugal Fan

Jun 20, 2018

When the impeller of a boiler centrifugal fan is rotated by the motor during operation, the gas between the blades will rotate with the impeller to a certain extent. Generally speaking, under the action of centrifugal force, The gas will be thrown out of the vane channel, which will effectively transfer the gas from 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 the boiler is no different from the angle of the fan. In operation, the wind is mainly produced by the rotation of the fan page driven by the motor. The different role of the induced draft fan and blowing fan is determined by the location in which they are installed. The former is located at the back end of the boiler, blowing to the flue outside the boiler, which produces negative pressure on the furnace and plays a guiding role on the flue gas, so it is called the induced fan. The latter, on the contrary, is located at the front end of the boiler, blowing into the boiler, so it is called a blower.

The noise of blower and induced fan in boiler room is generally about 90 decibels during the operation of centrifugal fan, mainly because the flue gas temperature of the boiler is as high as 180 . Therefore, combining noise reduction and energy saving of fan in process. Through practice, the comprehensive treatment scheme for energy saving and noise reduction of boiler fan is as follows: the process arrangement of boiler room remains unchanged, the blower and inducer are placed in the sound insulation room separately, and they are connected with the main engine by air vent pipe. Air inlet is provided on the top of the sound insulation chamber or on the wall, and muffler is installed for air inlet in the machine room.

When the boiler centrifugal fan is arranged in plane, 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. When the boiler is in operation, a large amount of outdoor fresh air will automatically enter the sound insulation chamber due to the negative pressure produced by the blower in the sound insulation room. Firstly, heat is exchanged with the induction fan motor to cool it down, and the indoor temperature remains about 50 .