HIGH PRESSURE GRINDING ROLL (HPGR) MACHINE … Papers/High_Pressure... · HIGH PRESSURE GRINDING...
Transcript of HIGH PRESSURE GRINDING ROLL (HPGR) MACHINE … Papers/High_Pressure... · HIGH PRESSURE GRINDING...
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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?
TOSHIBA
Since 1896
MITSUBISHI 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 ore being crushed
How do you share load?
•Rolls are not absolutely identical and can wear at different 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
M2M1 Drive 2Drive 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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Master – Follower Arrangement
A
R1 R2
P
M2M1Drive 2
(Follower)Drive 1
(Master)
Speed
Reference Torque Reference
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Master – Follower Arrangement
•The “master” drive operates as a speed regulator
•The “follower” drive operates as a torque follower
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Master – Follower Arrangement
Benefits:
•Even Load sharing
•Good at maintaining tangential velocity
•Utilizes a speed reference
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Master – Follower Arrangement
Sequencing: Uses different control schemes for
startup and operation.
1. Mill starts up with both drives in speed regulation
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Master – Follower Arrangement
2. Drives monitors torque and shifts to master-follower
mode when the load threshold is met
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Master – Follower Arrangement
Additional Functionality: OR Regulator
•Monitors actual drive speed v/s the speed
reference.
•If measured speed diverges from reference speed
the follower drive will shift back to speed regulate
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Master – Follower 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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Master – Follower 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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