Installation and Maintenance of High Temperature Fan by Xianrun Blower

Installation and Maintenance of High Temperature Fan by Xianrun Blower

Introduction

High temperature fan is widely used in iron and steel plant, metallurgy industry, chemical industry, electric power plant and other industries, and compared with normal centrifugal fan, high temperature fan has higher failure rate, and shorter service life. So, the installation and maintenance technical requirements is relatively higher, as well as more difficult.

High Temperature Fan for Cement Rotary Kilns

1.1 Centrifugal Fan Main shaft Installation 

Thermal expansion of the high temperature fan main shaft is achieved by the positioning end bearing axial direction moving. The main shaft thermal expansion under high temperature working condition has been considered during the designation, generally, the installation location dimension of bearing house and centrifugal fan impeller will be marked clearly in the drawing. 

High Temperature Fan for Cement Rotary Kilns

During on-site installation, the below two points needs attention: 

(1) according to the main shaft expansion direction, select the load end as positioning end;

(2) according to the cover difference to confirm locating bearing and non - locating bearings.

High Temperature Centrifugal Fan by Xianrun Blower

High Temperature Centrifugal Fan by Xianrun Blower

The high-temperature centrifugal fan consists of the motor, the variable speed device, the centrifugal fan body, the inlet flow control device, the slow-moving device and lubrication system.

1. the motor: generally, it is high temperature motor.
2. the variable speed device: generally, using hydraulic coupling, SCR cascade frequency control and frequency control, speed ratio is more than 2: 1.

High Temperature Fan for Cement Rotary Kilns

3. the centrifugal fan body: mainly includes the rotor group (mainshaft, impeller), casing and air inlet. The rotor is key component of centrifugal fan, so it must be processed with non-destructive inspection strictly and high-precision dynamic balance test to ensure the centrifugal fan smooth operation.

4. inlet flow control device: controlling the airflow by the adjusting door and electric actuator.
5. slow-moving device: composed of motor and high-speed ratio gear box, to ensure the rotor won't bend when the high-temperature fan stop operation.

High Temperature Fan for Cement Rotary Kilns

Centrifugal Fan Application for Gas System of Iron and Steel Plant

Centrifugal Fan Application for Gas System of Iron and Steel Plant by Xianrun Blower

Centrifugal fans are widely applied in iron and steel plant gas system, and play an important part in steel plant development. 

In general, iron and steel plant generates three kinds by-product coal gas, blast furnace gas, converter gas, coke oven gas, these three gas are important energy to steel industry. While the three gas have different features. 

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1. Blast Furnace Gas
Blast furnace gas are produced in blast furnace process, large capacity, low calorific efficiency. At present, blast furnace dust collector in dry method is very common, compared with wet dust collection, the condensate water of blast furnace gas has stronger acidity. 

2. Converter Gas
Converter gas are produced in converter steelmaking process, high content CO, high toxicity. 

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3. Coke Oven Gas

Coke oven gas is generated in coke oven smelting process, has the features of high calorific efficiency, easy to explosive, high content of impurities and so on. 

Centrifugal Fan Selection Matters Need Attention by Xianrun Blower---Part 2

Centrifugal Fan Selection Matters Need Attention by Xianrun Blower

5. In the centrifugal fan selection, the most important is long-term economic operation quality and efficiency, other than one-time investment. 

6. In the centrifugal fan selection, be seriously compared with each other, give preference to higher efficiency, samller size, lighter weight, larger adjusting range one. 

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7. For the frequency conversion centrifugal fan, please note that the system calculated total pressure losses are rated pressure, and centrifugal fan power needs to append 15%~20% on calculated value. 

8. Pay attention to the matching relation of pipe system resistant characteristics and centrifugal fan characteristics. For stable operation, centrifugal fan needs to work around the highest efficiency point, and the working point is right of the pressure peak point in the performance curve (in larger airflow side, in general, the working pressure is 80% of pressure peak point). 

Centrifugal fan design point efficiency should not be less than 90% of the highest efficiency. 

High Temperature Fan for Cement Rotary Kilns

9. For more than one centrifugal blowers working in parallel or in series, it is better to select the same model centrifugal fans. 

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 High Pressure Centrifugal Fan Casing

Xianrun Blower High Pressure Centrifugal Fan Casing, for any needs, contact www.lxrfan.com, xrblower@gmail.com

Abandoned Power Plant Becoming Science Fiction Movies Location by Xianrun Blower

Abandoned Power Plant Becoming Science Fiction Movies Location by Xianrun Blower

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This coal fired power plant came into use since the year of 1920, owned by Exelon Generation, one energy company. In 1985, after working 65 years, the power plant was out of service. And the waste machines in this power plant got rusty heavily, so there was a special beauty in this power plant. 

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This power plant was established after World War I. At first, it was a shipyard in 19 century, covering about 16 acre (About 6.5 hektare), part buildings under the water. Main buildings included several large sky window, 350 thousand square foot (about 0.3 hektare), and 55 foot (about 16.7 meter) height ceiling, this power plant looked most magnificent. 

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Although this place was very old and shabby, Bart Blatstein and Joseph Volpe were still willing to pay about 3 million USD to buy this waste power plant, which included 1000 foot (about 300 meter) river and wharf. The two buyers planed to develop this place to hotel, banquet hall and restaurant. 

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Abandoned Power Plant Becoming Science Fiction Movies Location by Xianrun Blower

Abandoned Power Plant Becoming Science Fiction Movies Location by Xianrun Blower

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According to Daily Mail reported, Bob Thissen, a photographer based in Netherlands, took the pictures of abandoned power plant inner scene, which is located in Philadelphia, America. 

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Since the power plant shut down 30 years ago, many film makers were attracted to this place by its reputation as a scenic location, and many movies were shooted in this rusting power plant, such as Transformers, Twelve Monkeys, The Last Airbender by M. Night Shyamalan. 

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Xianrun Blower Cement Kiln High Temperature Centrifugal Fan

Xianrun Blower Cement Kiln High Temperature Centrifugal Fan

The Reason of Centrifugal Fan Impeller Ash Deposition

The main reason of the centrifugal fan impeller ash deposition is that, when the waste exhaust flow through the impeller, a large number of fine dust particles collide with impeller non-working surface and blade trailing edge near the working face in impeller, then deposite in the centrifugal fan impeller; what's more, dust particles are more sticky under high temperature, so the deposition chance increase. 

High Temperature Fan for Cement Rotary Kilns

Thus, the waste exhaust gas temperature and airflow speed play an important role in the ash deposition process, when the exhaust temperature of the cement kiln preheater reach over 300 centigrade degrees, then high temperature centrifugal fan will begin to happen dust deposition and crust frequently.

High Temperature Fan for Cement Rotary Kilns