Keynote Address 14 th US/North American Mine Ventilation Symposium
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Transcript of Keynote Address 14 th US/North American Mine Ventilation Symposium
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Keynote Address14th US/North American Mine Ventilation SymposiumChristopher J Pritchard MS PE
Mining EngineerTeam Leader (Acting)Ventilation GroupFires & Explosions BranchNIOSH – OMSHRSpokane, WA
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Introduction
Ventilation Experiences
•MSHA
•Graduate School
•Tg Soda Ash
•FMC
•NIOSH
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MSHA1978-1980
MSHA – Coal Mine Safety and Health
District 9
Denver, CO
MSHA Denver Tech Support Ventilation Group:
Rich Kline, Bill Bruce, Warren Andrews,
Jerry Fuller, Ralph Foster
Ventilation Surveys, Ventilation Plan approvals,
Mine Inspector training, Ground Support, Special Investigations
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Graduate School
Michigan Technological University 1980-81
Professor Rudolf E Greuer
Developed MFire program with USBM
Thesis: Mine Ventilation and Emergency Planning for the Transition between Surface and Underground Mining at the Republic Iron Ore Mine
Temperature pre-calculations
Natural ventilation
Fire simulation - MFire
Escape planning
Capital costs analysis
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Texasgulf / Tg Soda Ash / FMC Granger 1981-2001Mine Ventilation, Mine Planning, Production Engineer,
Engineering Supervisor
1.2M TPY trona mine in southwest Wyoming
2 Shafts, 1 Main Fan @500k cfm Exhausting
Room and pillar, shortwall mining, continuous miner, diesel haulage
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Shortwall Mining System
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Advancing Tailgate Ventilation Design
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Section Air Recirculation Detail
With Andy Cecala, Bob Timko, USBM Pittsburgh
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Section Recirculation Tests
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District Recirculation
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Dust Settling Rates/Reduction in a Recirculation System
With Bhaskar and XuUniversity of Utah
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Shop Air Reuse Instead of Sending Directly to Return
Return Shaft
Intake Shaft With Linn Laage,Bill Pomroy, USBM Minneapolis
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Modified Submain DevelopmentResults:
32 stoppings eliminated in 5000 ft development
Ventilation gain – 30,000 cfm
Operational cost savings - over $15,000Note: Diesel haulage allowed longer belt moves. Stubs mined for roof control.
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Styrofoam Stoppings Introduced to Combat Damage from Poor Ground
Ventilation Engineer’s Motto: You can fix almost everything with polyurethane!
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Intake/Return Isolation
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FMC 2001-2008Mine Ventilation Coordinator, Rock Mechanics, Project Manager
• 4.5M TPY, 1.5M cfm, opened 1947• Longwall / Borer Miner Operation• 8 shafts, 3 Main Fans (Blowing)
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Plan, Sink 9 Shaft, Move Longwall to New Block 2002-2004
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2 EAST 20 F PANEL
1 EAST BLEADER
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423 WEST DEV.
452 WEST DEV.
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3 NORTHEAST DEVELOPMENT
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3 NORTHEAST DEVELOPMENT
3 Main East Dev.3 Main East Dev.3 Main East Dev.
3 E
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ou
th B
leed
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3 Main East Dev. 3 Main East Dev.
New Return 9 shaft
Old LW Block
New LW Block 2004
Future Block 2007
Intake Shaft
Old Return Shaft
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Ventilation issues: Mine Closure for Solution Mining - Tg Soda Ash, 2006
• Bulkhead shaft bottom to protect pillars below plant for solution mining
• Maintain mine ventilation during process
• Diesel Equipment/CH4• Short circuit main fan air on
surface and at shaft bottom – reduce pressure, mine flow 150k to 60k cfm
• Sealing Sequence – East, South (1BH), North (3BH)
Return
Intake
MainReturn
Bulkheads
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Move to NIOSH Spokane 2008
• Thanks to Jurgen Brune, Floyd Varley• Research Metal Non-metal ventilation and mine fires
Validate VentgraphProgram using 1972 USBM SunshineMine Fire Data
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Booster Fan/Recirculation Study at Large Room and Pillar Longwall Trona Mine
(Martikainen)
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Test panel detail
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District Recirculation Fire Simulation
Boxes -Airflow m3/s
Fan Airflow 17.8 m3/s , 38k cfm
Smoke - RED
RecirculationFan Location
Program –Ventgraph
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Remember:
• Every day you make a difference in miner’s health, safety and quality of work
environment.