Hydraulics Operation_Coal_Mill.pdf
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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
31-Oct-14
1
Main assembly groups Hydraulic system HSLM : N2 accumulators Illustration Bladder accumulator
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
2
Main assembly groups Hydraulic system HSLM : ring pipeline Connecting pipeline to HSLM
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
3
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
31-Oct-14
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
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
000538
[kN/mm]
Main assembly groups Hydraulic system HSLM - Spring stiffness
31-Oct-14
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Main assembly groups Coal: Hydraulic system HSLM - function • operating pressure
• counter pressure • flow direction
Ball valve 5.4
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
6
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
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
31-Oct-14
7
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table Increase operating pressure
Pump motor
Closure device 5.3
5.4
5.5
Solenoid control valves 7.1
7.2
b
0
7.3 7.5 7.6
7.10
Running 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
31-Oct-14
8
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table
Pump motor
Reduce operating pressure
Closure device 5.3
5.4
5.5
Solenoid control valves 7.1
7.2
0
I
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
31-Oct-14
9
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table Raising rollers
Pump motor
Closure device 5.3
5.4
5.5
Solenoid control valves 7.1
7.2
a
0
7.3 7.5 7.6
7.10
Running Closed Open Closed
I*
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
31-Oct-14
10
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table
Pump motor
Keep rollers in top position
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
31-Oct-14
11
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table
Pump motor
Lowering rollers
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
I
I
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
31-Oct-14
12
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table
Pump motor
Increase counterpressure
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
I
Position “0“ dead Postion “I“ live Position “I (a,b)“ live * Temporary Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
13
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Function table
Pump motor
Reduce counterpressure
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
I
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
31-Oct-14
14
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • partial flow filter
• flow direction
Function table Partial flow filter
Pump motor
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
Running 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
31-Oct-14
15
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Service
Pump motor
Nitrogen pressure test in accumulator
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 Open
Open Open
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
31-Oct-14
16
Main assembly groups Coal: Hydraulic system HSLM – hydraulic scheme • operating pressure
• counter pressure • flow direction
Service
Pump motor
Keep rollers in top position for service
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 Closed 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
31-Oct-14
17
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
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
18
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
31-Oct-14
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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
31-Oct-14
20
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)
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
21
Main assembly groups Swinging device - structure The swinging device consists of: Hydraulic cylinder HSAV pump unit
Illustration Drawing
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
22
Main assembly groups Swinging device – HSAV Pump unit Illustration
HSAV Pump unit
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
23
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
Process and operation – LOESCHE Vertical Roller Mill - Type Coal and Raw material
31-Oct-14
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