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Lignite Coal Rotary Dryer

Lignite Coal Rotary Dryer

Lignite coals become increasingly important in energy consumption with the deposits of other energy resources decreasing every year. The direct utilization of moist brown coals wit lignite coals become increasingly important in energy consumption with the deposits of other energy resources decreasing every year. The direct utilization of moist lignite coals without drying brings many problems such as low combustion efficiency, high greenhouse gas emissions, and it is not acceptable for coal gasification or liquefaction. Pre-drying lignite coal is necessary and meaningful.hout drying brings many problems such as low combustion efficiency, high greenhouse gas emissions, and it is not acceptable for coal gasification or liquefaction. Pre-drying lignite coal is necessary and meaningful.

Max input size:capacity:0.5-200t/hcapacity:0.5-200t/h

Capacity:discharge moisture:discharge moisture:<=1%

Material:Pulverized coal, coal gangue, flyash, lime powder,sawdust, wood chip, coal slime, bolus alba, silica powder

Whatsapp ID:+8615093378359

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Lignite Coal Rotary Dryer Introduction

Lignite coal rotary dryer is mainly used for drying brown pulverized and other machinery and equipment. Under the condition that the quality of the dried brown pulverized coal remains unchanged, the lignite coal rotary dryer adopts the low-temperature four-stage drying process to evaporate the lignite water to less than 13% of the water content. In the primary drying zone, most of the water is removed at 400℃ under high humidity to ensure that the chemical composition of lignite does not change and is not easy to burn. The room temperature of the secondary drying zone is 300℃, and the water removal is high-yield through the medium-temperature strong induction air to ensure that the lignite does not coking;The indoor temperature of the three-stage drying area is 120℃-210℃. The crushing device in the drum is used to repeatedly impact and disperse the materials and dry them in the flow.The four-level drying area is a high-exhaust area, with a room temperature of 60℃-80℃, and the water is removed by the low-temperature hot gas flow of negative pressure in the induced air system.

The lignite coal , also known as diesel coal, is a mineral coal with a low degree of coalification and large water content. After drying, lignite is mainly used as fuel for power plants, and can also be used as chemical raw materials, catalyst carriers, adsorbent, sewage purification and metal recovery. At present, the lignite dryer is the main equipment for drying lignite. The lignite coal rotary dryer adopts the new technology of crushing and dispersing the lignite coal with high humidity first and then drying it, so that the drying treatment of materials has realized continuity, industrialization and automation.


Images

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Advantages

1. lignite coal rotary dryer has strong overload resistance, large processing capacity, less fuel consumption and low drying cost.

2. the use of down-flow drying method, smoke and wet material from the same side into the dryer, you can use high temperature smoke to obtain high evaporation strength, dryer outlet temperature is low, high thermal efficiency.

3. The operation parameters can be changed according to different material properties, so that the material can form a stable completely broken fabric curtain in the dryer cylinder body, and the mass and heat exchange are more adequate.

4. the new feeding and discharging device, eliminate the drum dryer feed blockage, discontinuity, uneven and return of materials and other phenomena, reduce the load of dust removal system.

5. The new internal structure strengthens the cleaning and heat conduction effect of dispersed materials, eliminates the sticking phenomenon of the inner wall of the cylinder, and has stronger adaptability to the moisture and viscosity of the materials.

6. The lignite coal rotary dryer realizes "zero horizontal thrust", greatly reducing the wear of the retaining wheel, and the cylinder runs smoothly and reliably.

7. The lignite coal rotary dryer adopts "aligning wheel support device", so that the support wheel and the rolling ring are always in linear contact, thus greatly reducing wear and power loss.

8. according to user requirements to control the product particle size and moisture, dry slime product moisture up to 8%, particle size can be controlled below 8mm.


Working Principles

When the lignite coal rotary dryer is working, the wet material is sent to the hopper by the bucket elevator or belt conveyor, and then enters the feed end through the feed pipe by the feed machine of the hopper. The slope of the feeding pipe should be greater than the natural inclination of the material, so that the material can flow smoothly into the dryer. The material is added from the higher end, the heat carrier enters from the lower end, and the material is in counter current contact, and the heat carrier and the material flow into the cylinder together. As the cylinder rotates the material is moved by gravity to the bottom end. In the process of moving the wet material forward in the cylinder body, the heat transfer of the heat carrier is directly or indirectly obtained, so that the wet material can be dried, and then sent out by the belt machine or screw conveyor at the discharge end. The inner wall of the cylinder is equipped with a copy plate, which is used to copy the material and scatter it, so that the contact surface between the material and the air flow is increased, so as to improve the drying rate and promote the progress of the material.

Technical parameters

specification(m)
(直径diameter×长度length)

筒体容积
cylinder volume(m³)

原始水份

Initial moisture

生产能力
capacity(t/h)

安装斜度
dip angle(%)

最高进气温度
Maximum intake air temperature(℃)

主电动机
main motor(kw)

总重量
main motor(t)

Φ1.2×8.0

9.0

>87%

1.9-2.4

3-5

700-800

7.5

9

Φ1.2×10

11.3

>87%

2.4-3.0

3-5

700-800

7.5

11

Φ1.5×12

21.2

>87%

4.5-5.7

3-5

700-800

15

18.5

Φ1.5×14

24.7

>87%

5.3-6.6

3-5

700-800

15

19.7

Φ1.5×15

26.5

>87%

5.7-7.1

3-5

700-800

15

20.5

Φ1.8×12

30.5

>87%

6.5-8.1

3-5

700-800

18.5

21.5

Φ1.8×14

35.6

>87%

7.6-9.5

3-5

700-800

18.5

23

Φ2.2×12

45.6

>87%

9.7-12.2

3-5

700-800

22

33.5

Φ2.2×14

53.2

>87%

11.4-14.2

3-5

700-800

22

36

Φ2.2×16

60.8

>87%

13.0-16.2

3-5

700-800

22

38

Φ2.4×14

63.3

>87%

13.5-16.9

3-5

700-800

37

45

Φ2.4×18

81.4

>87%

17.4-21.7

3-5

700-800

37

49

Φ2.4×20

90.4

>87%

19.3-24.1

3-5

700-800

45

54

Φ2.4×22

99.5

>87%

21.2-26.5

3-5

700-800

45

58

Φ2.6×24

127.4

>87%

27.2-34.0

3-5

700-800

55

73

Φ3.0×20

141.3

>87%

30.1-37.7

3-5

700-800

75

85

Φ3.0×25

176.6

>87%

37.7-47.1

3-5

700-800

75

95

Φ3.2×25

201

>87%

42.9-53.6

3-5

700-800

90

110

Φ3.6×28

285

>87%

60.8-76.0

3-5

700-800

160

135



  • Indirect heat transfer dryer


  规格

 specification

外筒内径Outer diameter of cylinder(mm)

内筒内径Inside diameter of cylinder mm)

筒体长度cylinder lengthm)

筒体容积cylinder volumem³)

筒体斜度dip angle

扬料板型式Lifting plate type

最高进气温度Maximum intake air temperature℃)

外形尺寸Dimensions(m)

Φ1.5×15m

1500

500

15

20.27

3-5%

升举式

· 

Lift plate

· 

 

850

16.2×2.7×2.7

Φ1.5×17m

17

22.97

18.2×2.7×2.7

Φ1.5×19m

19

25.68

20.0×2.9×2.9

Φ1.8×21m

1800

650

21

35.91

3-5%

升举式

· 

Lift plate

· 

 

850

22.5×2.7×2.7

Φ1.8×23m

23

39.33

24.5×2.9×2.9

Φ1.8×25m

25

42.75

26.5×2.9×2.9

Φ2.2×21m

2200

800

21

58.10

3-5%

升举式

· 

Lift plate

· 

 

850

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The capacity is determined by the moisture and gravity of the material.

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