Y5-48 Boiler Ventilator

The Y5-48 boiler centrifugal induced-draft fan is designed specifically to match 1 to 20 t/h industrial boilers that burn various types of coal and are equipped with smoke suppression and dust removal devices. It can be selected for any application where the inlet air conditions are comparable and the performance specifications are compatible. The maximum operating temperature must not exceed 250°C. Before the induced-draft fan, a dust removal device with an efficiency of at least 85% must be installed to reduce the dust content of the flue gas entering the fan, thereby helping to extend the fan’s service life.

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Usage

The Y5-48 boiler centrifugal induced-draft fan is designed specifically to match 1 to 20 t/h industrial boilers that burn various types of coal and are equipped with smoke suppression and dust removal devices. It can be selected for any application where the inlet air conditions are comparable and the performance characteristics are compatible. The maximum operating temperature must not exceed 250°C. Before the induced-draft fan, a dust removal device with an efficiency of at least 85% must be installed to reduce the dust content of the flue gas entering the fan, thereby helping to extend the fan’s service life.

Form

The fan mechanism is designed with a single-inlet configuration. The fan models available are No. 4, 5, 6.3, 8, 10, and 12.5—six models in total.

The induced-draft fan can be manufactured in either right-hand or left-hand rotation. When viewed from the end of the motor, if the impeller rotates clockwise, it is called a right-hand fan and is denoted by “right”; if the impeller rotates counterclockwise, it is called a left-hand fan and is denoted by “left”.

The outlet position of the fan is indicated by the angle of the fan casing’s air outlet. Both “left” and “right” can be manufactured in six angles: 0°, 45°, 90°, 135°, 180°, and 225°.

Structural features

Structural Features: Currently, there are many different series of industrial boilers available, and the quality of coal used varies significantly. Consequently, the dust collectors paired with these boilers exhibit varying resistance levels, leading to substantial differences in the required air volume and pressure for the induced draft fans. To accommodate these diverse conditions and taking into account the economic efficiency of the fans, all units employ V-belt (Type C) transmission. This approach not only allows a single fan model to operate at different speeds, thereby meeting the requirements of various dust collectors for boilers of the same capacity, reducing the number of fan series and models needed; it also enables operating units to select different speeds according to their specific circumstances, thus achieving the most desirable air volume and pressure for their particular applications.

① Impeller—It features 12 backward-curved flat blades made of Q345 (16Mn), welded between the arc-conical wheel cover and the flat impeller disc. After undergoing static and dynamic balancing corrections, it operates smoothly and boasts high strength.

② Casing — Universal for “left” and “right” rotation, No. 8 and above. The蜗plate is also equipped with a dust-cleaning door, facilitating the removal of accumulated dust from the blades and inside the casing, thereby ensuring the balance and aerodynamic performance of the impeller.

③ Air inlet— The air inlet is designed as an integrated, streamlined structure with a converging shape and is secured to the inlet side of the casing using bolts.

④ Adjusting damper—The damper blades are petal-shaped, with 9 blades for Nos. 4 through 6 and 11 blades for No. 8 and above. The damper is axially mounted in front of the air inlet. Thanks to its external-drive design, the damper rotates smoothly and conveniently. The adjustment range spans from 0° (fully open) to 90° (fully closed). When viewed from the direction of the air inlet, the handle of the adjusting damper is located on the right side. For right-hand rotation fans, pushing the handle downward—from bottom to top—moves the damper from fully closed to fully open; for left-hand rotation fans, pulling the handle upward—from top to bottom—achieves the same transition. To ensure proper operation of all parts of the adjusting damper, it must be well-lubricated. A molybdenum disulfide high-temperature grease (operating at up to 260°C) is used as the lubricant, guaranteeing reliable lubrication even when the fan is running at elevated temperatures.

5) The transmission assembly consists of a main shaft, bearing housing, pulley, and other components. The main shaft is made of high-quality steel and equipped with ball bearings and an integral water-cooled bearing housing; therefore, a water supply pipe must be installed. Water consumption varies depending on the ambient temperature but is typically estimated at 0.5 to 1 m³/h. The bearing housing is fitted with a thermometer and an oil-level indicator, and it is lubricated using L-AN46 total-loss system oil. The amount of oil added should comply with the markings on the oil-level indicator.

Run operation

After all installations are completed and the final inspection has been passed, only then can the trial run be carried out. To prevent the motor from overheating and burning out, during the fan’s startup and trial run, it must be conducted under no-load conditions—i.e., with the dampers or regulating valves in the intake duct closed. If everything appears normal, gradually open the regulating valves and proceed with a continuous full-load operation test. For newly installed fans, the trial run duration shall be no less than 2 hours; for repaired fans, the trial run duration shall be no less than half an hour. Only when no abnormal phenomena occur can the fan be put into formal use. During operation, the current must be strictly monitored and must not exceed the specified limit.

Check the clearance dimensions of all parts of the fan to ensure there is no rubbing or even collision between rotating and stationary components. Verify that the oil level in the bearing housing is between the minimum and maximum oil levels. Confirm that the electrical wiring and instruments are properly connected and functioning correctly. Inspect whether the cooling system is operating normally. Close the regulating damper.

Check the vehicle for any abnormal phenomena. If no abnormalities are detected, gradually increase the idling time until the engine reaches its normal operating speed. Once the engine has reached its normal speed, gradually open the regulating valve until the specified load is achieved. Unless otherwise specified, the bearing temperature rise shall not exceed 40℃ above the ambient temperature, and the root-mean-square vibration velocity at the bearing location shall not exceed 6.3 mm/s.

If you detect abnormal conditions such as severe vibration, impact, or a rapid rise in bearing temperature in the fan, you must immediately stop the machine and identify the cause.

Keywords:

Y5-48 Boiler Ventilator

Category:

Industrial centrifugal fan