ideal boiler fan assembly

This ideal boiler fan assembly is a forced and induced drought fan for the GY4-68 boiler. It is commonly used in boiler ventilation and drought systems. Its evaporation capacity is 230t / h. In addition, it can also be used for mine ventilation and general ventilation. This type of fan has the advantages of high efficiency, low noise and high strength.
Product description

Product introduction:

1. This ideal boiler fan assembly is a forced and induced drought fan for the GY4-68 boiler. It is commonly used in boiler ventilation and drought systems. Its evaporation capacity is 230t / h. In addition, it can also be used for mine ventilation and general ventilation. This type of fan has the advantages of high efficiency, low noise and high strength.

2. The medium handled by the ideal boiler fan assembly is air, and the maximum temperature of the treated air generally does not exceed 80 °C. The medium treated by the induced draft fan is flue gas, and the maximum temperature of the treated flue gas generally does not exceed 250 °C. A dust control unit must be added to the machine when in use. In order to reduce the dust content of the flue gas entering the fan, the efficiency of adding the dust collector is not less than 85%.

Product features:

1. The ideal boiler fan assembly is single-suction and has 2 types of rotation. The drive mode of the fan uses mode D and uses a flexible coupling connection. The fan is mainly composed of an impeller, a casing, an air inlet, a damper and a driving device.

2. The impeller is made of twelve rear-tilted vane blades welded between the arc conical wheel cover and the flat disc. Generally speaking, the fan impeller is 16Mn, and an anti-wear backing plate is connected between the blade and the wheel cover, and the blade head is a solid body, and the surfacing is added in a place where the wear is easy, so the service life is longer.

3. This product is detachable. For dry fans, the ash door is opened on the rolling plate and thickened as appropriate to prevent soot wear. Its damper is used to regulate the flow of the fan. It is axially mounted in front of the air inlet and is easy to operate because the external drive structure can be used. In order for all parts of the adjustment door to function properly, care must be taken to lubricate.

Performance and selection:

The optional performance of the fan should be calculated based on the dimensionless characteristic graph and the dimensionless performance table.

11.jpg

22(001).jpg

G4−68(left fig.) and Y4−68 (right fig.) centrifugal fan for boiler nondimensional characteristic curve chart.

G4-68 centrifugal fan for boiler nondimensional performance table

Operating condition point/
Code

1

2

3

4

5

6

7

Flow coefficient 111.jpg

Full pressure coefficient 222.jpg

Full pressure efficiency 22.33.jpg 
Internal power coefficient 333.jpg

0.155
0.493
0.858
0.0891

0.175
0.483
0.887
0.0953

0.195
0.467
0.909
0.100

0.215
0.445
0.915
0.105

0.235
0.415
0.904
0.108

0.255
0.377
0.880
0.109

0.275
0.335
0.843
0.109

Y4-68 induced drought centrifugal fan for boiler non dimensional performance table

Operating condition point/
Code

1

2

3

4

5

6

7

Flow coefficient 111.jpg

Full pressure coefficient 222.jpg

Full pressure efficiency 22.33.jpg

Internal power coefficient 333.jpg

0.145
0.492
0.836
0.0853

0.165
0.483
0.870
0.0916

0.185
0.465
0.892
0.0964

0.205
0.443
0.900
0.101

0.225
0.415
0.893
0.105

0.245
0.380
0.865
0.108

0.265
0.338
0.822
0.109

When fig. and table above are only applicable for Re≥5×106, at Re<5×106, corresponding modification is carried out acc. to experiment result

33.jpg

Considerations for choosing such a fan:

1. The fan number is selected by engineering and user based on flow and full pressure. The specific performance and motor used should be found in the “Performance and Optional Parts List”, and other types of motors can be selected, but the power and speed should be appropriate and noted when ordering.

2. Each speed performance of the "Performance and Optional Parts List" is an average of the performance within 90% of the maximum efficiency assigned to the seven calculated performance points. In order to flow, it will use the performance table as the mainstream of the order.

3. The performance of the qualified product delivered by the fan is that the full pressure does not exceed ±8% at rated flow.

4. In the performance characteristic chart and optional table:

The performance of the ventilator is calculated. Air medium t = 20 ° C, atmospheric pressure Pa = 101325 Pa, air density γ = 1.2 kg / m 3. The standard state of the induced draft fan indicates atmospheric pressure Pa = 101325 Pa, atmospheric temperature t = 140 ° C, air density ρ = 0.85 kg / m 3. The performance curve and table represent the parameters that adjust the door to fully open (0°).

5. If the operating conditions of the fan do not meet the operating conditions of item 4, the performance is calculated using the following formula:

44.jpg

6. In performance table:

55.jpg

7. When air inlet condition is not changed, Q(flow), P(full pressure, N(power) and n (rev) have the following relation:

66.jpg

When capacity of motor does noty change, the draught fan can not be operated at full opening under cold state or rev is incresed at will, otherwise the motor takes the risk of overloading and being burnt out.

77(001).jpg

Relation of pipe grid performance and full pressure windage to flow

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