Xianrun Blower: centrifugal fan

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2017年3月6日星期一

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.

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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.

2017年2月28日星期二

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

2017年2月23日星期四

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.

2017年2月13日星期一

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.

2017年2月7日星期二

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.

2017年1月16日星期一

Xianrun Blower High Pressure Centrifugal Fan Casing

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

2017年1月11日星期三

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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2016年12月5日星期一

Centrifugal Fan Surface Anti-corrosion Measures by Xianrun Blower

A basic thinking of corrosion control is to isolate from corrosion environment. In centrifugal fan, generally using surface anti-corrosion measures, such as galvanization, chromium plating, electroless plating, coating epoxy resin, etc, these measures are effective in many environments.

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But for the rotating parts, please pay attention to an important phenomenon: the basis material and plating are two kinds material, with different coefficient of linear expansion;
the rotating parts will have different deformation during the rotating elastic deformation, resulting in large amount of micro crack; If the phenomenon exist, which will accelerate the corrosion of centrifugal fan impeller. So surface anti-corrosion measures for rotating parts need careful attention.

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2016年12月4日星期日

Large Centrifugal Fans for 5000t/d Cement Production Line by Xianrun Blower

No.5 Cement Raw Material Mill Recirculation Fan

Quantity: 2 Sets

Centrifugal fan impeller diameter: About 2450 mm

Driving Mode: Double suction coupling driving

Airflow: 250000 m3/h

Air pressure: 3500 pa

Air temperature: Normal 70 centigrade degree

Max 150 centigrade degree

Dust content: 120g/Nm3

Speed adjustment: frequency control

Motor: 355 KW

Voltage: 10 KV

High Temperature Fan for Cement Rotary Kilns

No.6 Cement Mill Powder Dust Collecting Fan

Quantity: 2 Sets

Centrifugal fan impeller diameter: About 2330 mm

Driving Mode: Double suction coupling driving

Airflow: 250000 m3/h

Air pressure: 5800 pa

Air temperature: Normal 60~85 centigrade degree

Max 120 centigrade degree

Dust content: ≤ 50g/Nm3

Speed adjustment: frequency control

Motor: 560 KW

Voltage: 10 KV

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2016年12月1日星期四

Large Centrifugal Fans for 5000t/d Cement Production Line by Xianrun Blower

For any needs, contact Xianrun Blower!

No.3 Kiln Head Electric Dust Collecting Fan

Quantity: 1 Set

Centrifugal fan impeller diameter: About 2200 mm

Driving Mode: Double suction double support

Airflow: 740000 m3/h

Air pressure: 3800 pa

Air temperature: Normal 250 centigrade degree

Max 400 centigrade degree

Dust content: ≤ 50g/Nm3

Speed adjustment: frequency control

Motor: 710 KW

Voltage: 10 KV

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No.4 Pulverized Coal Mill Ventilation Fan

Quantity: 1 Set

Centrifugal fan impeller diameter: About 1680 mm

Driving Mode: Single suction coupling driving

Airflow: 90000 m3/h

Air pressure: 8000 pa

Air temperature: Normal 60~85 centigrade degree

Max 120 centigrade degree

Dust content: ≤ 50g/Nm3

Speed adjustment: frequency control

Motor: 280 KW

Voltage: 10 KV

High Temperature Centrifugal Fans for Cement Plant

2016年11月30日星期三

Detail Parameters of Large Centrifugal Fan for 5000 t/d Cement Production Line

For any needs, contact Xianrun Blower.

No.1 Raw Material Grinding Mill Exhaust Fan

Quantity: 2 Sets

Centrifugal fan impeller diameter: About 3000 mm

Driving Mode: Double suction double support

Airflow: 450000 m3/h

Air pressure: 10500 pa

Air temperature: Normal 80~90 centigrade degree

Max 150 centigrade degree (last more than 15 min)

Dust content: ≤100g/Nm3

Speed adjustment: frequency control

Motor: 1800 KW

Voltage: 10 KV

High Temperature Fan for Cement Rotary Kilns

No.2 Kiln End Bag House Fan

Quantity: 1 Set

Centrifugal fan impeller diameter: About 2380 mm

Driving Mode: Double suction double support

Airflow: 950000 m3/h

Air pressure: 3800 pa

Air temperature: Normal 110 centigrade degree

Max 250 centigrade degree

Dust content: ≤ 50g/Nm3

Speed adjustment: frequency control

Motor: 1400 KW

Voltage: 10 KV

High Temperature Fan for Cement Rotary Kilns

2016年11月28日星期一

Centrifugal Fan Driving Modes Advantages and Disadvantages By Xianrun Blower

A Mode: Direct Driving
The impeller of centrifugal fan connects to the motor shaft directly, this is suitable for small airflow and pressure centrifugal blower.
Advantage: saving the parts (such as belt pulley, belt, coupling, etc.), reliable performance.
Disadvantage: fixed speed.

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C Mode: Belt Driving
The impeller connects to motor shaft by belt pulley.
Advantage: adjustable speed, motor installation position is flexible.
Disadvantage: Some parts are easy to break down, and need updating maintenance.

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D Mode: Coupling Driving
The impeller connects to motor shaft by coupling, coupling drive centrifugal fan for high temperature, large airflow and high pressure condition.
Advantage: stable operation, high efficiency.
Disadvantage: fixed speed, high cost.

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2016年11月27日星期日

Venturi Scrubber Dust Collector Centrifugal Fan by Xianrun Blower

The venturi scrubber is mainly composed of venturi tube (shrink tube, throat pipe, expanding tube) and the cyclone separator, centrifugal fan.

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Working principle of venturi scrubber dust collector: dusty gas enters into the shrink tube, then the flow speed increases gradually along the pipe; water or other liquid are ejected by the throat pipe, struck by high-speed airflow and atomization; dust particles in the gas contact with liquid drops and lubricate; after entering expanding pipe, the flow speed decreases gradually; the dust particles are bonded to each other; the particles volume increase and easy to remove; then, the gas enters the cyclone separator, due to the centrifugal force, water and dust particles are thrown to the separator wall and outflow cyclone separator; finally, the purified gas is exhausted out by centrifugal fan.

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The advantage: simple structure, high dusting efficiency, good cooling effect.
The disadvantage: big resistance, just used for wet-type dust collecting.

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2016年11月24日星期四

Electrostatic Dust Collector Centrifugal Fan by Xianrun Blower

Electrostatic dust collector is a new way of processing small dust scattered points. This electrostatic dust collector uses the exhaust duct or enclosed hood as counter electrode, which connect high voltage power supply and form electric field.

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When centrifugal fan sends dusty gas to the electric field, the dust under the electric field force, is collected on the cover or wall, after purification, the gas is exhausted out by centrifugal blower.

Coupling Driving FD Fan with High CFM

Ash removal by artificial shaking or falling out self-gravitationally. This dust collector is particularly suitable for scattered dust points of crushing, screening shop and sintering workshop transporting belt, or dust purification for mine tunnel, small boilers.

The electrostatic dust collector has many different models, generally includes bell-type, tube-type, open-type.

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2016年11月23日星期三

Spray Tower Scrubber Centrifugal Fan by Xianrun Blower

Spray Tower Scrubber Working Principle:

In the counter-current spray tower, dusty gas moves upward by centrifugal fan, the droplets by nozzle make downward movement. Because of inertia collision, intercept, cohesion functions between droplets and dust particles, the larger particles are collected by the droplets.

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Spray Tower Scrubber Features:

1. It uses packed tower to purify the waste gas, and is suitable for continuous or intermittent dusty gas discharge.
2. Spray tower scrubber has the features of simple structure, small pressure loss, stable operation, high efficiency, etc.
3. Wide application, and can purify a variety of pollutants and dusty gas.

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Spray Tower Scrubber Application:

In chemical industry, electronics industry, metallurgic industry, electroplating industry, textile factory, food plant, and so on, it can purify and collect acid waste gas, alkaline waste gas, dusty gas in the processing.

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2016年11月22日星期二

Wet-Type Impingement Dust Collector Centrifugal Fan by Xianrun Blower

Impingement wet dust collector is used for high humidity, big discharge, large dust content industrial waste gas, especially suitable to purify the fibrous, non-corrosive, and temperature less than 300 centigrade dusty gas. The impingement wet dust collector has good effect in the dust system of sticky quick lime transportation.

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The smoke exhausting from boiler by centrifugal fan enters into the dust collector, impacts the water at high speed, most dust particles stay in the water due to the weight increase or sticking to water, this is impingement stage.

At this time, because of the gas movement, the water form a parabola-shape drop, spray, and bubble area, then the dusty gas is purified further in this area, and this is a water bath stage.

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What is more, when the high temperature gas enters into the dust collector, the water and gas will form water spray, the dust particles change flow direction, further purification when moving forward, this stage is nebulization dust collector.

Through the above three ways purification, clean gas from dust collector flow to the chimney.

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