Hydraulics Operation_Coal_Mill.pdf

COAL MILL HYDRAULICS, RAW MLL LUBRICATION SYSTEM & SWING DEVICE OPERATION

Hydraulic cabinet HSLM

Illustration

Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material

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Main assembly groups Hydraulic system HSLM : N2 accumulators Illustration Bladder accumulator


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Main assembly groups Hydraulic system HSLM : ring pipeline Connecting pipeline to HSLM


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Main assembly groups Hydraulic system HSLM - function The rollers crush the grinding material through their own weight and additionally applied hydraulic pressing force. The pressing force of the rollers on the grinding material is generated by the hydro-pneumatic spring assembly system.

Coal mill: A stop buffer on the rocker arm prevents the tires from coming into direct contact with the grinding plates.

Illustration Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material

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4

8,0

7,0

6,0

Cwf Spring stiffness of the roller

5,0

p1 Charging pressure of the hydraulic accumulator

cwf

Spring stiffnes

A

3

4

p2 Operating pressure 4,0

A Operating range 3,0

p2 p1max = 0.8 * p2min p1min = 0.25 * p2max

2,0

1 1,0

0,0

2 20,0

40,0

60,0

p1

80,0

100,0

120,0 [bar]

Pressure bladder accumulator


000538

[kN/mm]

Main assembly groups Hydraulic system HSLM - Spring stiffness

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Main assembly groups Coal: Hydraulic system HSLM - function • operating pressure

• counter pressure • flow direction

Ball valve 5.4


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Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure


Function table

Pump motor

Mill in operation

Closure device 5.3

5.4

5.5

Solenoid control valves 7.1

7.2

0

0

7.3 7.5 7.6

7.10

Stop Closed Open Closed

0

0

0

0

Position “0“ dead Postion “I“ live Position “I (a,b)“ live * Temporary Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material

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Function table Increase operating pressure

Pump motor

Closure device 5.3

5.4

5.5


7.2

b

0

7.3 7.5 7.6

7.10

Running Closed Open Closed

0

0

0

0


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Function table

Pump motor

Reduce operating pressure

Closure device 5.3

5.4

5.5


7.2

0

I

7.3 7.5 7.6

7.10


0

0

0

0


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Function table Raising rollers

Pump motor

Closure device 5.3

5.4

5.5


7.2

a

0

7.3 7.5 7.6

7.10


I*

0

0

0


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Function table

Pump motor

Keep rollers in top position

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10


0

0

0

0


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Function table

Pump motor

Lowering rollers

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10


0

I

I

0


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Function table

Pump motor

Increase counterpressure

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10


0

0

0

I


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Function table

Pump motor

Reduce counterpressure

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10


0

I

0

0


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• counter pressure • partial flow filter

• flow direction

Function table Partial flow filter

Pump motor

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10


0

0

0

0


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Service

Pump motor

Nitrogen pressure test in accumulator

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10

Stop Open

Open Open

0

0

0

0


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Service

Pump motor

Keep rollers in top position for service

Closure device 5.3

5.4

5.5


7.2

0

0

7.3 7.5 7.6

7.10

Stop Closed Closed Closed

0

0

0

0


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Main assembly groups RM mill: Roller lubrication system HSMS – structure and function The roller lubrication system HSMS is an oil circulating system and consists of:

Hydraulic cabinet HSMS

 Hydraulic cabinet HSMS  Connecting pipeline  LM lubrication line The roller lubrication system HSMS serves to:  lubricate the rollers

Illustration


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Main assembly groups RM mill: Roller lubrication system HSMS - structure

 lubrication hydraulic cabinet  connecting pipeline from the hydraulic cabinet to the roller

 roller with bearings to be lubricated Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material

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Main assembly groups RM mill: Roller lubrication system HSMS - function

 the grinding rollers are lubricated by the oil circulation system. The HSMS hydraulic cabinet grinding roller lubrication forms the oil supply system.  ensures a stable oil level in the roller and a continuous lubrication of the roller bearings to keep the oil temperature stable. Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material

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Main assembly groups RM mill: Roller lubrication system HSMS - interlocks

Interlocks

 a certain oil temperature in the tank is required to start the system

 starting the lubrication pumps after 30 minutes grinding operation

 stopping the pumps 1 hour after mill stop (to avoid the overheating of the bearings)


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Main assembly groups Swinging device - structure The swinging device consists of:  Hydraulic cylinder  HSAV pump unit

Illustration Drawing


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Main assembly groups Swinging device – HSAV Pump unit Illustration

HSAV Pump unit


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Main assembly groups Swinging device - function The swinging device serves to:  swing out the rollers

A

B 1 6

2

3

5

Illustration 000540

4

1 Grinding roller, swung out

4 Hydraulic cabinet, HSAV

2 Hydraulic cylinder

5 Pedestal

3 Joint seating

6 Grinding roller, swung in


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Hydraulics Operation_Coal_Mill.pdf

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