Matters Need Attention During the Centrifugal Fan Selection by Xianrun Blower

Matters Need Attention During the Centrifugal Fan Selection by Xianrun Blower

1. The main controls parameters for centrifugal fan: airflow, air pressure, efficiency, noise, speed, motor power and so on. 

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2. Centrifugal fan pressure grade: 
Pressure>3000 pa, high pressure centrifugal fan; 1000pa<=pressure<=3000pa, medium pressure centrifugal fan;Pressure<1000 pa, low pressure centrifugal fan. 

The centrifugal fan selection should be based on the air physical property, chemical property, and different application.

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3. During the centrifugal fan selection, what should be considered is air leakage loss,calculation error of pipeline system, and centrifugal fan airflow and air pressure deviation. In general, airflow safety factor is 1.05~1.1, air pressure safety factor is 1.10~1.15. But the safety factor should not be too big, in case the centrifugal fan works in low efficiency for long time. 

4. If the centrifugal fan service condition is different from centrifugal fan sample (such as air temperature, air pressure), the centrifugal fan should be adjusted appropriatly. 

Xianrun Blower XR-I & XR-II Model High Pressure Centrifugal Blower for Cement Kiln System

Xianrun Blower XR-I & XR-II Model High Pressure Centrifugal Blower  for Cement Kiln System

XR-I, XR-II model high pressure centrifugal blower is specially designed for cement kiln system.The transmission medium, such as air, smoke etc. temperature should not exceed 80 Centigrade; dust and hard particles content in the medium can not be more than 150 mg/m3.

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This model high pressure centrifugal fan is single suction fan, driving mode is direct driving. According to the pneumatic structure, the fan impeller blade is new design forward curved blade impeller with high efficiency; air inlet is convergent streamline structure; good flow performance, stable and reliable running, high efficiency.

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Xianrun Blower High Pressure Centrifugal Blower Parameters

Impeller Diameter	470-550 mm
Airflow	232-1554 m3/h
Air pressure	5028-6918 Pa
Efficiency	Above 80%
Air temperature	20 Centigrade
Driving Mode	A Mode: Direct driving

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The Reasons Analysis of Centrifugal Fan Required Emergency Stop

Centrifugal fan requires emergency stop in the following situations. The operation of the emergency stop is to push the main motor stop button, and then handle the problem of after stop. 

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A. Centrifugal fans break out sudden strong vibration, and vibration amplitude is more than tripping values. 

B. The centrifugal fan body internal parts have touch scraping or abnormal friction sound. 

C. Bearing or sealing parts have smoke, or the bearing temperature rise sharply to the alarm value. 

D. Oil pressure is lower than the alarm value and can not return to normal value. 

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E. The liquid level of oil tank is low, and empty absorption phenomenon has appeared. 

F. Axis displacement values appear obvious sustained growth, and achieve alarm value.

Notes To Centrifugal Blower Selection by Xianrun Blower

As we all know, it needs to get much knowledge before choosing a suitable blower. And the selection methods are different according to different selection standard. 

1.According to physical, chemical properties of different gases, it needs to select different fans. Such as, the explosion-proof fan for conveying explosive and flammable gas; 
coal dust fan is used to convey coal dust; corrosion resistant fan for corrosive gas; heat resistant fans are applied in high temperature gas or high temperature situation.

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2. Understanding the centrifugal blower production and quality are necessary before selecting the industrial fans and blowers. Such as the centrifugal fan varieties, specifications and development and promotion of new products, and the requirements of environmental protection.

3. If there are two models centrifugal blower are available in the performance table, it is better to give preference to higher efficiency, smaller size, larger adjusting range.

4. If the ventilation system have requirement for noise, it is better to select high efficiency, low impeller rotational speed fans. And according to the noise and vibration modes of transmission, adopt corresponding noise elimination and vibration reduction measures. Vibration reduction measures of fan and motor includes spring shock absorber or rubber shock absorber, etc.

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5. If the selected fan impeller diameter fan is larger than the original impeller. In order to advantage of the original motor shaft, bearing and supporting, it is necessary to check
the starting time, strength of the original parts and the shaft critical speed.

6. Try to avoid using the centrifugal fan working in parallel or in series. When the inevitable, it needs to select the same model centrifugal fan, with the same performance. 
When using series operation, there should be certain pipeline connection between the first level fan and second level fan.

7. The new selected fan should make full use of existing equipment, and be suitable for on-site installation and in safe operation.

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Part 5.3 Choose A Narrow Blade by Xianrun Blower

5. Improve the Centrifugal Fan Structure by Xianrun Blower

The fan blade wear degree of blade have close relationship with its own installation angle and air inflow angle. For lower hardness plastic material, the most serious abrasion occur in angle between 15 and 30, and the influence degree is related to the blade shape. 

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When the blade pressure surface is circular arc form, causing the most unfavorable impact angle, strengthening the cutting ability, form the most serious wear parts. 

As for narrow straight blade centrifugal fan, as long as the reasonable design of fan blade, wear is relatively light.

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