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Ceramic Dip Tube Of Preheater Cyclone

Ceramic Dip Tube Of Preheater Cyclone have significant influence on the separation efficiency of a cyclone. In modern suspension preheaters it is standard to use cyclones with a dip tube for improved separation.

Overview

Ceramic Dip Tube Of Preheater Cyclone have significant influence on the separation efficiency of a cyclone. In modern suspension preheaters it is standard to use cyclones with a dip tube for improved separation. Especially the design of a lower stage dip tube requires know-how and expertise in order to achieve a low pressure drop of the cyclone by retaining the best possible separation efficiency (to avoid too high dust circulation). The choice of material is of great importance due to high operating temperatures, abrasive material and often existing chemical conditions.

Key function:

1. To increase separation efficiency

2. To enhance thermal exchange rate between gas and raw meal

Working conditions:

1. 1200℃ oxide etch

2. Corrosion from chlorine, sulfur and alkalis vapor

3. Abrasion from high-speed material flow 16- 30m/s

The shortest life is 4-6 months with traditional heat resistant materials according to China’s cement industry statistics.


Hasle Refractories (Danmark Solution)

1. Unreasonable structure

2. Al-Si series materials are fragile after 1500℃ burned

3. Weak corrosion resistance to K2O and Na2O vapors

4. Al2O3: 65% SiO2:35%

5. Commonly used: 1Cr18Ni9Ti / Cr35Ni12

 

Raw material: Silicon-carbide Advantages:

Remarkable perofrmance in abrasion & corrosion resistance and high strength in high temperature

Ceramic design which avoids clogging of the inlet chamber caused by brokage of the dib tube


Structure: Bar-type Advantages:
Ceramic inner dip tube shape

1. Easy installation and maintenance due to the light weight of ceramics and bar-type shape

2. It is more safety for assembly

Case Study

Comparision between Ceramic dip tube and HR steel dip tube in operation

Item

Unit HR steel DT Ceramic DT

Feed rate

Ton/Hour 76 83-85

Output

Ton/hour

48.7

52.53

Raw coal consumption

kg/t.cl

165

165

Daily capacity

Ton

1169

1260

Operating time ratio %

85

88

Cost comparison between HR steel DT and Ceramic DT

Item85

HR steel dip tube

Ceramic dip tube

Investment

USD/Unit

Life 

Months

Annual Cost

USD/Unit

Investment

USD/Unit

Life

Months

Annual Cost

USD/Unit

5th stage dip tube

71,500

9

95,333 55,710 36

18,570

4th stage dip tube

67,100

12 67,100 55,710 36

18,570

3rd stage dip tube

33,500

19 21,157 55,710 36

18,570

2nd stage dip tube

54,200

30

21,679 55,710 36

18,570

Total

205,269

92,850

Other benefits:

1. Service life : 2-3 times of traditional HR steel dip tube

2. Lower replacement frequency: it would be reduced that result in maintenance cost drop further,and safety status improved.

3. Premium integrity: higher efficiency in separation and thermal exchange between metal and gas, which greatly reduce the heat consumption

4. Environmental friendly: completely chrome free

 

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