G6-51 and Y6-51 type boiler ventilators

G、Y6-51 boiler induced-draft fans are primarily used in the air supply and exhaust systems of steam boilers with capacities ranging from 2 t/h to 670 t/h in thermal power plants, and they also meet the high-head performance requirements of fluidized-bed boilers. This series of fans can also be applied to dust removal, mine ventilation, and general ventilation systems.

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Usage

The medium conveyed by the supply fan is air, while the medium conveyed by the induced-draft fan is flue gas or gas containing particulate impurities. When the concentration of impurities is less than 200 mg/m³, the fans can be used for more than four years. Even if the concentration of impurities is higher, the fans can still be used, though their service life will be relatively shortened. The maximum operating temperature for both supply and induced-draft fans must not exceed 250℃.

Style

1. The forced-draft fans and induced-draft fans are typically designed in single-suction configurations. There are 20 model numbers for each of the fan sizes from №8D to №29.5D, totaling 40 specifications.

2. Each type of fan can be manufactured in either a left-hand or right-hand rotation configuration. When viewed from the motor end, if the impeller rotates clockwise, the fan is referred to as a “right-hand” fan and denoted by “right”; conversely, if it rotates counterclockwise, the fan is called a “left-hand” fan and denoted by “left.”

3. The position of the fan’s air outlet is indicated by the outlet angle of the fan casing:

① The fan drive method is Type D, meaning it features a cantilever structure, and both the motor and the fan are connected via direct coupling with an elastic coupling.

② Examples of full product names are as follows: G6-51-1 No. 18 D Right 90°, Y6-51-1 No. 18 D Left 0°.

Among these, G and Y respectively represent the boiler supply fan and the boiler induced draft fan; 6 is the pressure coefficient at the point of maximum efficiency, rounded to the nearest tenfold; 51 is the specific speed; 1 indicates the first design stage; №18 denotes an impeller diameter of 1800 mm; and 90° refers to the outlet air angle.

Structural features

1. The fan series is designed based on an aerodynamic profile that has been finalized through more than a year of model testing, and incorporates the patented technology of “adjustable air inlets.” It also features advanced proprietary technologies such as a high-strength, wear-resistant impeller, oil-tight bearing housing, and self-aligning axial adjustment damper.

2. High-strength, wear-resistant impeller: The impeller features close-diameter, backward-curved single-blade blades that reduce airflow impact, ensuring excellent stability and preventing the motor from easily becoming overloaded. This design overcomes the drawbacks of the original 4–73 model, such as internal dust accumulation after the wing-shaped hollow blades wore through, as well as vibrations caused by dust buildup on non-working areas. The parts of the induced draft fan blades most prone to wear are specially coated with a wear-resistant weld overlay designed specifically for fans, significantly extending the fan’s service life. This fan model boasts a high pressure coefficient, low peripheral velocity, and low noise levels, making it highly practical and versatile.

3. Oil-leak-proof bearing housing: It employs a lap-type oil-flinging ring that throws the oil lifted by the high-speed rotating bearing onto the inner wall of the bearing housing, where it flows back into the oil sump. The semi-open aluminum oil seal not only facilitates maintenance and prevents friction-related accidents but also increases axial resistance to trap some of the diluted oil and return it to the sump. The external pressurized packing effectively seals off a small amount of diluted oil. The bearing housing is equipped with a vent plug at its upper part, which reduces the slight positive pressure inside the housing, ensuring no oil leakage and providing excellent dust-proof performance.

4. Self-aligning axial regulating damper: All support points of the guide vanes in this regulating damper are equipped with self-aligning bearings, ensuring that there are no “dead” points during operation and adjustment. As a result, the adjustment is flexible, effortless, safe, and reliable, effectively preventing overloading of the actuator. It can also be used outdoors.

5. The fan is available in either an integral or modular assembly configuration: For fans with impeller diameter No. 16 D and below, the transmission unit, electric motor, and coupling cover are pre-assembled on a single, complete base prior to shipment; the casing, air inlet, and damper are mounted on another separate base. For smaller-sized fans, the components are pre-assembled into two bases before delivery; for larger-sized fans, they are disassembled and assembled into three separate bases (with the motor forming yet another independent base). 6. This fan is easy to install and maintain: The fan features two complete bases—the casing and the transmission unit—and the casing has either a horizontal or vertical parting surface, making disassembly and reassembly exceptionally convenient. The rotor can be lifted out vertically, and if only the impeller needs replacement, it can be removed axially.

7. Key measures to ensure product quality:

① When the diameter of a fan impeller exceeds 2 m or its peripheral speed exceeds 100 m/s, nondestructive testing shall be conducted according to the standard.

② When the impeller peripheral speed is high, use reinforced blades. For the parts of induced-draft fan blades that are prone to wear, apply a weld overlay using wear-resistant welding electrodes specifically designed for fans. After on-site wear occurs, users can perform the weld overlay themselves.

③ Both the air inlet and outlet of the fan are equipped with flexible connectors to prevent stress interference caused by deformation of the ductwork and the fan itself.

④ No. 14 D ~29.5 D fans all use SKF imported rolling bearings.

⑤ No. 16 D and above are all equipped with vibration protection devices to prevent damage to the unit caused by vibration.

Keywords:

G6-51 and Y6-51 type boiler ventilators

Category:

Industrial centrifugal fan