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BBD double inlet and double outlet tube coal mill

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Description

BBD Double Inlet & Double Outlet Tube Coal Mill

BBD double inlet and double outlet tube coal mill is the major equipment for direct blow pulverizing system which is used in the power plant, cement factory and papermaking factory. This coal mill can continuously work, fast response and flexibly be operated, the easy-maintain, stable output and fitness, big storage, low ratio of air to coal, widely used in different varieties of coal, coal gangue interfused non-disturbing the normal operation can satisfy with the applicable in grinding different hardness and high corrosion coal, thus so as to save purchasing more standby coal mill for unexpected need.

BBD double inlet and double outlet tube coal mill is equivalent to which the pulverizing system of tube coal mills are paralleled together to increase the pulverizing system efficiency.

The raw coal is carried to the entrances of coal mill at two sides by the automatical coal feeder and is delivered into the in-rotating tube by the screw conveyer then the freely dropping and throwing steel balls inside the tube impact and grind the coal into the fine powder.

The hot air is blown into the mill through blowpipe located in the quill shaft at the two sides of coal mill, the coal grinded will be blown up and dried, and also be carried by hot air to pass through the annular interval between the quill shaft and blowpipe and coal conveying pipe to enter into the separator, then the heavy coarse coal is separated to the back coal tube and come into the coal pipe where the coarse coal and raw coal meet, afterwards these coal will be screw-conveyed back the rotating tube for grinding again, the fine coal is transmitted into the powder tube system in the top of separator and delivered to burner nozzle in the boiler.

This series of tube coal mill adopts asymmetrical operation. The coal can be fed in one side, and extracted from the other side or two sides, which can flexible the coal mill operation, especially the coal mill can be operated freely by option.

BBD Tube coal mill is comprised of separator, tube, transmission, main bearing, bellows, screw conveyer, electrics parts, lubricant and other auxiliary parts.

According to the arrangement of separator at site the mill has two options of separated structure or compact structure for customer.

There is also other configurations with options of hydraulic roof tank, or steel ball feeder or slow driver and every specifications of steel ball for customers.

The lubricant system of this series of is comprised of main bear which is be lubricated with static and dynamic pressure and gears which is lubricated with dry oil sprayed.

The feeding level inside of this type series of mill is controlled by the micro-computer interlocking through the differential pressure and electronic ears, and the variation from the boiler load to mill load leading to changing the coal feeder speed can be achieved the auto control.

The technology parameter for the BBD double inlet and double outlet coal mill is listed as below:

Thermal Value 2500-6000 kcal/kg
Moisture 8~20% (Due to the coal character, which can reach 30% at special condition)
Grindable 40~70HGI
Ash (anhydrous) 18~49%
Feeding Granularity 0~30mm
Output Granularity 75~85% (200 mesh screen is used)


Figure

The fired double inlet and outlet coal mill: Inner diameter is 4560,tube length is 6140
Remark: BBD4760 Coal mill

Type and Specifications


Parameter

Item

Type

BBD
2536

BBD
2942

BBD
3448

BBD
3854

BBD
4060

BBD
4062

BBD
4366

BBD
4760

BBD
4772

Inner DiameterInside scaleboardmm

2450

2850

3350

3750

3950

3950

4250

4650

4650

Tube length mm

3740

4340

4940

5540

6140

6340

6740

6140

7340

Double-cone Separator Diameter mm

1600

1800

2100

2400

2900

2900

3050

3200

3500

Mill Rotation r/min

20.4

19

18

17

16.6

16.6

16

15.3

15.3

Motor

Rate (kw)

280

500

830

1200

1400

1600

1800

2140

2550

Rotation r/min

1000

Voltage v

6000

Steel ball load (Max) t

20

32

48

67

76

88

97

106

127

Weight
Motor, Feeder, Steel ball, Valve is not includedt

119

196.7

235

236.1

242

245

263

Output
t/h

The data is given based on standard coal HGI=50  H2O=8%
(75% of quantities is passing the 200 mesh screen)

13

22

35

53

60

62

79

90

105

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