Y5-47 Boiler Draft Fan

The Y5-47Ⅱ type boiler centrifugal induced draft fan is suitable for industrial boilers fueled by various types of coal and equipped with smoke suppression and dust removal devices, with capacities ranging from 0.2 t/h to 20 t/h. It can be adopted by any system that has comparable inlet air conditions and matching performance characteristics; however, the maximum operating temperature must not exceed 250℃.

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Usage

While central air conditioning is certainly convenient, the astronomical price tags have compelled us in certain situations to opt for the Y5-47 boiler centrifugal induced draft fans. The Y5-47Ⅱ fan has undergone a series of improvements compared to the original Y5-47 model, resulting in a significant reduction in noise levels. Moreover, to better meet the requirements for boiler compatibility, seven additional model numbers have been newly introduced: №3.15C (for boilers ranging from 0.2t/h to 0.5t/h), 4D (for boilers ranging from 0.7t/h to 1t/h), 5D (for boilers rated at 2 t/h), 6D (for boilers rated at 4t/h), 7C (for boilers rated at 4t/h and 6t/h), 10D (for boilers rated at 6t/h), and 11D (for boilers rated at 10t/h).

The Y5-47Ⅱ type boiler centrifugal induced-draft fan is suitable for industrial boilers ranging from 0.2 t/h to 20 t/h that burn various types of coal and are equipped with smoke suppression and dust removal devices. It can be adopted by any system where the intake air conditions are comparable and the performance is compatible; however, the maximum operating temperature must not exceed 250℃.

Form

1. The fan mechanism features a single-inlet design, and the model numbers are №3.15, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 12.4—a total of eleven models.

2. The induced draft fan can be manufactured in both left-hand and right-hand rotation types. When viewing the fan from the drive end, if the impeller rotates clockwise, the fan is classified as a right-hand rotation. 3. The outlet position of the fan is indicated by the angle of the casing’s outlet port. Both “left” and “right” versions can be configured with three angles: 0°, 90°, and 180°.

4. The fan drive methods are Type C and Type D. The motor is connected to the fan either via belt pulleys or directly through an elastic coupling.

5. If the aforementioned transmission method, outlet angle, and machine model fail to meet your plant’s production requirements, our factory is capable of designing and modifying equipment based on the specific conditions at your site.

Structural features

① The impeller—composed of 12 backward-swept, flat blades made of 16Mn steel welded between an arc-conical shroud and a flat disc—is subjected to dynamic balancing and overspeed operation tests, ensuring smooth and reliable operation. Its key performance indicators—including strength, wear resistance, and service life—are unmatched among all types of fans.

② Casing — Welded from ordinary steel plates into a volute shape. From No. 8 and above, both “left” and “right” hand threads are universally applicable.

③ Air inlet— The converging-type air inlet is designed as an integral structure and secured to the fan inlet side using bolts.

④ Adjusting Damper— Fans of the Y5-47 series are all equipped with adjusting dampers used to regulate the airflow of the fan. For fans of No. 6 and smaller, the dampers feature a three-blade, louver-type design that is flexible in closing and boasts a simple structure. For fans of No. 7 and larger, the dampers adopt a petal-shaped, self-centering type, offering high adjustment efficiency and reliable construction. The adjusting damper is mounted axially upstream of the air inlet. Its adjustment range spans from 90° (fully closed) to 0° (fully open). When viewed from the direction of the air inlet, for right-rotating fans, turning the damper handle counterclockwise moves it from fully closed to fully open; for left-rotating fans, the opposite is true.

To ensure the proper operation of all components of the damper, lubrication must be performed effectively. Given that the induced-draft fan operates at relatively high temperatures, a high-temperature (260℃) lithium-based grease is used for lubrication, guaranteeing that it will not lose its effectiveness even under high-temperature operating conditions.

⑤ Drive Assembly—The main spindle is made of high-quality steel and features two parallel bearing housings equipped with ball bearings (bearings of low-noise type are used for models No. 3.15–7). The bearings are lubricated with No. 2 calcium-sodium-based grease. The impeller is air-cooled, and the overall structure is simple.

Features

The Y5-47Ⅱ fan is an improved version based on the original Y5-47 fan. At its optimal operating point, the fan achieves a total pressure internal efficiency of 85.6%, and its noise level (A-weighted sound level) is 12.5 dB.

Currently, there are many different models of industrial boilers available, with significant variations in the quality of coal used. The accompanying dust collectors and pipeline resistances also differ considerably, leading to substantial differences in the required air volume and pressure for induced draft fans. To accommodate these varying conditions, this fan is designed with two types of transmission systems: D-type and C-type (i.e., coupling and V-belt drive). Specifically, boilers ranging from 0.7 t/h to 20 t/h are matched with D-type transmission-induced draft fans, while boilers ranging from 0.2 t/h to 10 t/h are matched with C-type transmission-induced draft fans. For units using V-belt drives, they can adjust the spindle speed according to their actual operating conditions to achieve more optimal air volume and pressure.

Keywords:

Y5-47 Boiler Draft Fan

Category:

Industrial centrifugal fan