Centrifugal Blower Selection Principle by Xianrun Blower

How to select a suitable blower to you?  By Xianrun Blower

1. Selecting high efficiency, small size, large adjusting range centrifugal fans, meet acceptable performance, efficiency and quality requirements;

2. The centrifugal blower working point need to be near efficiency running point, to ensure the stable operation, avoid the fan works in surge area;

Xianrun Blower centrifugal fan performance curve

3. Reducing noise by decreasing the centrifugal fan speed and selecting bigger size blower;

4. If selecting oversize blower, the blower will works in small air volume area, pressure difference is big between air inlet and outlet, causing operation instability and high impulsive noise;

5. If selecting undersize blower, the fan will increase rotation speed, the air will have higher speed after leaving the blades, also causing higher noise;

Xianrun Blower warehouse

6. In general, the average wind speed in fan air outlet is at 10 ~ 15 m/s, can not be more than 17 m/s;

7. The fan speed is less than 450 RPM, selecting 8 poles motor; 451 ~ 799 RPM, selecting 6 poles motor; 800 ~ 1500 RPM, selecting 4 poles motors; more than 1500 RPM, selecting 2 poles motors.

Xianrun blower centrifugal fan delivery 

The design requirements of centrifugal fans by Xianrun Blower

Xianrun Blower centrifugal fan design requirements

(1) The operating point which meets the required airflow and air pressure should be near the highest efficiency point; 
(2) The efficiency is high, while the efficiency curve should be smooth;
(3) The stable workspace of the pressure curve have wide range;
(4) Simple structure, good technical capability;
(5) Enough strength, rigidity, working safely and reliable;

xianrun blower centrifugal fan

(6) Low noise;
(7) Excellent regulation performance;
(8) The centrifugal fan size should be as small as possible, and weight should be as light as possible;
(9) Easy operation and simply maintenance. 

xianrun blower centrifugal fan accessories

Industrial Fans And Blowers Types in Cement Plant by Xianrun Blower

Different Models Industrial Fans And Blowers in Cement Production Line by Xianrun Blower

According to different used parts in the cement production line, the industrial fans and blowers can be divided into: high temperature preheater fan, raw material grinding mill circulation fan, kiln head exhaust fan, kiln tail exhaust fan, cement grinding mill circulation fan, roller press circulation fan, grate cooler cooling fan.

cement plant industrial fans and blowers by xianrun blower

 According to the different content and characteristics of circulation fan, which are applied in roller press, raw material grinding mill, cement grinding mill of cement production line, 
Xianrun Blower industrial fans and blowers process different strength wear-resistant treatment,such as overlaying, plasma welding, spraying, spraying welding, wear resistant high polymer material, stickup ceramic chip, and so on. 

wear resistant centrifugal fan by xianrun blower

Part 6 Conclusion of Centrifugal Fan Wear Proof Measures in Cement Plant By Xianrun Blower

Xianrun Blower Application in Cement Plant

There are many causes for gas-solid two phase flow fan wear; some are the cause of the fan itself, such as fan structure, material, etc.; some are dust removal system causes, such as dust characteristics, dust concentration, etc. 

cement plant centrifugal fan by xianrun blower

Generally, fan wear resistant measures can be divided into two categories: passive anti-wear and driving anti-wear. 

Passive anti-wear is selecting appropriate wear-resisting material for fan or process wear resistant treatments to the fan parts.  
Although the passive anti-wear method has played a certain role in wear resistant measures, but it can not fundamentally eliminate and reduce wear. 

cement factory centrifugal fan by xianrun blower 

Driving anti-wear, also known as aerodynamic anti-wear, mainly from the dynamics gas-solid two phase flow characteristics, designs optimally to the fluid machinery itself anti-wear,more over, control and configure optimally the flow parameters. 

Aerodynamic anti-wear is the fundamental measures to solve the dust particles wear problems.

xianrun blower centrifugal fan in cement plant

Using the front wear resistant blade cascade or increasing the guide vane by Xianrun Blower

5. Improve the Centrifugal Fan Structure by Xianrun Blower

The reasons why wear parts of the fan is not uniform is that the uneven distribution of solid particles in the air. 

wear resistant centrifugal fan impeller by xianrun blower

In general, the wear is serious in big concentration place, while the wear is light in small concentration places.

Using the front wear resistant blade cascade or increasing the guide vane are based on the perspective of gas dynamics, control particle motion to uniform distribution, and then reduce the wear and tear. 

After the impeller installed front wear resistant blade cascade or increasing the guide vane, and they will rotate with the impeller rotation. In this case, generate airflow to dispel the particle beam; force to reduce their orbit radius; prevent the particle move back to rear plate and the blade root; make the solid particles uniform distribution along the impeller; thus convert the particle concentration wear to even wear; finally, improve centrifugal fan impeller wear ability and prolong the service life.

wear resistant centrifugal fan impeller by xianrun blower

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. 

narrow blade centrifugal fan by xianrun blower

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.

high pressure centrifugal fan by xianrun blower

Part 5.2 Change the Hollow Blade to Solid Blade by Xianrun Blower

Part 5. Improve the Centrifugal Fan Structure by Xianrun Blower

5.2 Change the Hollow Blade to Solid Blade

This method is mainly aimed at airfoil blade. Due to the airfoil blade are hollow, so when the blades are worn through, dust particles will go into the blade, destroying the fan impeller balance, further more, reducing the service life. 

xianrun blower wear resisting centrifugal fan

In order to avoid this phenomenon, it is better to change the hollow blade to the equal thickness straight solid blade. But when the blade width is too large, changing to straight solid blades will decrease the strength and stiffness,even more causing deformation. In this case, it needs to add stiffener plate between front disc and rear disk in two adjacent blades.

wear resisting centrifugal fan impeller by xianrun blower

In order to increase the blade wear resisting performance, welding wear-resisting welding wire in blade is a good measures.