Y8-39 and Y9-38 boiler ventilators

The Y8-39 and Y9-38 series centrifugal induced-draft fans for boilers have been jointly designed by leading experts from the national fan industry, organized by the Fan Energy-Saving Group of the Ministry of Machine Industry, and are key energy-saving products promoted by the State Economic Commission and the Ministry of Machine Industry. These fans are specifically engineered to ensure that the induced-draft fan operates in the high-efficiency range even under varying operating conditions of industrial boilers, thereby achieving energy savings. They boast advantages such as high efficiency, low noise levels, and a wide high-efficiency performance curve.

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Usage

This fan is suitable for industrial boilers ranging from 0.5 to 35 tons/hour that are equipped with economizers (preheaters) and flue gas desulfurization and dust removal devices. It can be selected for any boiler whose intake conditions are similar and whose performance is compatible; however, the maximum inlet air temperature must not exceed 250℃. Before the induced-draft fan, a dust removal device with a dust removal efficiency of at least 85% must be installed to reduce the dust content in the flue gas entering the fan, thereby minimizing wear on the fan caused by smoke and dust and extending the fan’s service life.

Style

1. This fan is designed with a single-inlet configuration. The fan models available are №4, №4.5, №5, №5.6, №6.3, №7.1, №8, №9, №10, №11.2, №12.5, №14, and №16—altogether thirteen model numbers.

2. This fan can also be manufactured in two rotation directions: clockwise and counterclockwise. When viewed from the drive end, if the impeller rotates clockwise, the fan is referred to as a right-rotating fan and is denoted by “right”; conversely, if it rotates counterclockwise, it is called a left-rotating fan and is denoted by “left.”

3. The outlet position of the fan is indicated by the outlet angle of the fan casing. Both right-rotating and left-rotating fans can be manufactured in six different angles: 0°, 45°, 90°, 135°, 180°, and 225°. If you require other fan models or different outlet angles, our factory is fully capable of providing custom-designed solutions tailored to your specific needs, meticulously crafted until you are completely satisfied.

Features

Currently, there are many different series of industrial boilers available, and the quality of coal used varies significantly. Consequently, the dust collectors and economizers paired with these boilers have differing resistance levels, leading to substantial variations in the required air volume and pressure for the induced draft fans. To take into account both the economic efficiency and adaptability of the fans, we offer two series—Y8-39 and Y9-38—for users to choose from. The connection and installation dimensions of the two series of fans with the same model number are identical.

Structural features

The fan consists of components such as an impeller, a casing, an air inlet, a transmission assembly, and a damper.

① Impeller—Made of 16Mn material, with alternating long and short forward-curved blades welded between an arc-conical front disc and a flat rear disc. After impeller formation, it undergoes rigorous static and dynamic balancing corrections as well as overspeed operation tests, ensuring smooth and reliable operation.

② Casing—welded from high-quality galvanized steel sheet into an integral spiral shape. A dust-cleaning door is provided on the spiral plate for easy removal of accumulated dust from the blades and the casing.

③ Air inlet—Designed as a streamlined, converging integral structure, it is secured to one side of the fan using bolts.

④ Drive assembly—consisting of the main shaft, water-cooled bearing housing, and coupling.

The main shaft is made of high-quality steel and equipped with rolling bearings. The bearing housings are available in two types: monolithic and split. For sizes №4 to 6.3, monolithic bearing housings are used; for sizes №7.1 to 16, split bearing housings are employed. Both types of bearing housings require water cooling, and the water consumption varies depending on the operating temperature and ambient temperature, typically ranging from 0.5 m³/h to 1 m³/h. Each bearing housing is fitted with a thermometer and an oil-level indicator. The bearing housings are lubricated with No. 30 mechanical oil, and the oil level should be maintained according to the markings on the oil-level gauge.

⑤ Damper—used to regulate the airflow rate of the fan. The damper features a petal-type centering mechanism and is axially mounted upstream of the air inlet. It adopts an external-drive design, ensuring flexible and convenient operation. The adjustment range spans from 90° (fully closed) to 0° (fully open). From the perspective of the air inlet, the damper’s handle is located on the right side. For right-rotating fans, pushing the handle from bottom to top corresponds to the transition from fully closed to fully open; for left-rotating fans, pulling the handle from top to bottom achieves the same transition from fully closed to fully open. To ensure proper functioning of all damper components, adequate lubrication is essential. We recommend using high-temperature (260℃) bentonite grease, which will prevent the fan from failing during high-temperature operation. A dust removal device with a dust removal efficiency of at least 85% must be installed to reduce the dust content in the flue gas entering the fan, thereby minimizing wear on the fan caused by smoke and dust and extending the fan’s service life.

Keywords:

Y8-39 and Y9-38 boiler ventilators

Category:

Industrial centrifugal fan