Fan is based on the input of mechanical energy, improve the gas pressure and send gas side by side of the machine, it is a driven fluid machinery. Fan in the usual sense includes ventilator, blower and wind generator. Fans are widely used in mines, tunnels, cooling towers, vehicles, ships and other places, especially in boilers and supporting burners. The problems of high fan failure rate and low reliability have been plaguing boiler operators. Today, we will briefly introduce the common faults of burner fans.
1.Excessive fan noise
Vibration can be caused by problems in the dynamic balance of the fan or damage to the blade of the fan during operation. When the fan is started, the water in the dust collector will boil violently and interact with the fan to produce a large amplitude. Vibrations are bound to cause loud noises. In addition, the fan is a centrifugal fan, which makes a huge roar and noise during operation.
Auxiliary dust removal measures can be appropriately added to solve the problem of excessive dust. The fan outlet pipe is connected to the wet dust collector through a long metal pipe. The dust collector first removes large particles of dust, and then enters the dust removal and sound insulation chamber. The technical measures combined with the expansion tube and the expansion chamber can reduce the gas flow, so that the small particles of dust with the condensation of water vapor in the flue gas fall naturally, and play a role of resistance and noise reduction. When the low flow gas enters the noise reduction chamber for further expansion, the noise is reduced through the resistance material absorption, and the resistant muffler at the bottom of the chimney is introduced through the pipe, and the flue gas is discharged into the atmosphere through the expansion pipe at the top of the chimney. Boiler drum and induced draft fan can be arranged in the same sound insulation air room. The blower draws in the air inside the room while taking away the drum. Induced draft fans and smoke pipes dissipate heat in the room, and the cold air replenished in the room enters the room through the intake muffler. The boiler exhaust pipe is fitted with silencer. Generally, the small hole muffler or multi-layer hole plate throttling and small hole injection compound muffler is used. In addition, can use low speed fan, increase the induced draft fan impeller, reduce the fan speed, fan pressure coefficient remains unchanged, the fan runs normally, to reduce the purpose of noise, but also use the hermetic cooling flue to increase the distance between the induced draft fan and residential buildings, reduce the impact of the boiler fan on residents.
2.Severe blade wear
The reasons for the wear of the boiler fan blade are various, including: there is no design condition in the operation of the boiler fan, the arc cutting line of the blade inlet is different from the inlet direction of the impeller, resulting in the inlet flushing Angle; Dust particles wear and wash the inlet position of the blade; The air inlet of the fan is set with cyclone dust removal equipment, which has good dust removal effect. But if the dust removal equipment is not cleaned in time, the fan is easy to enter the dust accumulation. The air flow generated by the boiler fan will drive the dust particles to the vicinity of the blade, which has the same function as the file blade and improves the degree of blade wear. In addition, the welding or composition material of the fan blade does not reach a certain hardness, and once the dust enters a higher hardness, it will accelerate the speed of blade wear and scouring.
For blade wear fault, the solutions are as follows: first, strengthen the dust cleaning in the dust removal equipment, reduce the amount of dust; Starting from the operation of boilers and coal, dust accumulation of dust removal equipment should be carried out at least once every 2 hours, which can effectively reduce the wear degree of dust particles. Second, the exhaust resistance is reduced to keep the arc cutting line at the blade inlet consistent with the blade airflow direction. Third, the boiler fan to strengthen the transformation of the impeller, improve the service life of the impeller. After modification, bending blade of veneer can increase motor load to a certain extent, but can effectively avoid the balance damage of equipment dust and prolong the service life of impeller. Fourth, high hardness materials can be used to effectively improve the wear resistance of boiler fan blades.
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