high pressure grinding roll 1112
TRANSCRIPT
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HIGH PRESSURE GRINDING ROLL
HPGR) MACHINE CONTROL METHODS
Michael Uliana
Technical Sales Manager
2012 WMEA San Antonio Meeting and Technical Symposium
San Antonio, TX, November 16, 2012
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Page 2< Confidential to TMEIC Corporation>
Who is TMEIC?
TOSHIB
Since 1896MITSUBISHI ELECTRIC
Since 1921
Industrial Systems
TOSHIBA MITSUBISHI-ELECTRIC
INSUSTRIAL SYSTEMS CORP.
Industrial Systems
TMA Electric Corporation
Since 1999
Since 2003
Power
Electronics
Motor Motor
Power
Electronics
TMEIC Corp.
Roanoke, VA, USA
Houston, TX, USA
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Presentation/Paper outline
HPGR Machine Design
Control Methods
Conclusion
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What is an HPGR Machine?
A
R1 R2
P
Material is crushed between two independently driven rolls
Hydraulic pressure is applied to maintain a specified gap
An autogenous layer forms on the rolls to protect the roll
surface
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HPGR Machine Design
Maintaining the same roll tangential velocity is important:
Helps maintain the autogenous layer
Minimizes roll wear
Increases uptime
R1 R2
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Industries using this technology:
Cement (very common, mostly fixed speed)
Mining (becoming more common, variable speed)
Why?
Potential energy savings v/s other grinding methods
Roll life becoming longer
HPGR Machine Design (cont.)
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Control Concerns:
When starting the mill, no connection between the rolls
How do you maintain speed?
While running, rolls are essentially connected by orebeing crushed
How do you share load?
Rolls are not absolutely identical and can wear atdifferent rates.
How do you keep the tangential velocity the same?
HPGR Machine Design (cont.)
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Potential Control Solutions
1. Independent Speed Regulators
2. Torque Regulation
3. Master-Follower Arrangement
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Independent Speed Regulation
A
R1 R2
P
M2M1 Drive 2Drive 1
Speed
Reference
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Independent Speed Regulation
Benefits:
Speed control during startup
Concerns:
Load sharing
Tangential Velocity
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Torque Regulation
A
R1 R2
P
M2M1Drive 2
Drive 1
Torque
Reference
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Torque Regulation
Benefits:
Even Load sharing
Concerns:
Speed control
How is the torque reference generated?
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MasterFollower Arrangement
A
R1 R2
P
M2M1
Drive 2
(Follower)Drive 1
(Master)
Speed
Reference Torque Reference
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MasterFollower Arrangement
The master drive operates as a speed regulator
The follower drive operates as a torque follower
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MasterFollower Arrangement
Benefits:
Even Load sharing
Good at maintaining tangential velocity
Utilizes a speed reference
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MasterFollower Arrangement
Sequencing: Uses different control schemes for
startup and operation.
1. Mill starts up with both drives in speed regulation
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MasterFollower Arrangement
2. Drives monitors torque and shifts to master-follower
mode when the load threshold is met
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MasterFollower Arrangement
Additional Functionality: OR Regulator
Monitors actual drive speed v/s the speedreference.
If measured speed diverges from reference speed
the follower drive will shift back to speed regulate
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MasterFollower Arrangement
Additional Functionality: Master Drive Selection
Either drive can be designated as the master
Selector switch on Drive #1 cabinet used in this
example
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MasterFollower Arrangement
Master Drive Designation
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After analyzing various control methods for HPGR
machines we determined an effective way to control the
system is via a Master-Follower arrangement
Conclusions
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Page 22< Confidential to TMEIC Corporation>
TMEIC Drive Line
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Customer Success, Every
Project Every Time!
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