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Air Heating Plant—Davis-Geneva Mine Thirtieth Annual Meeting by F

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Air Heating Plant—Davis-Geneva Mine Thirtieth Annual Meeting by F PROCEEDINGS [Papers (cont’d)] OF THE LAKE SUPERIOR MINING INSTITUTE AIR HEATING PLANT—DAVIS-GENEVA MINE THIRTIETH ANNUAL MEETING BY F. E. BOYD, DULUTH, MINN.* HELD ON THE The Davis-Geneva Mine is an underground iron mine, GOGEBIC RANGE operated by the Oliver Iron Mining Company and located MICHIGAN about 2½ miles east of Ironwood, Michigan. Prior to SEPTEMBER 14th AND 15th, 1939 1937, it was ventilated chiefly by gravity with a few portable blowers for the working places. In June of that VOL. XXIX year, a complete system of mechanical ventilation was ISHPEMING, MICH. placed in operation. The installation was simplified by PUBLISHED BY THE INSTITUTE. the abandonment some time previously of the Davis AT THE OFFICE OF THE SECRETARY, Shaft as a hoisting shaft, leaving it free for installation of 1939. the ventilation plant at the collar. The flow of air is down the Davis Shaft and up the Geneva Shaft. PRESSES OF IRON ORE, ISHPEMING, MICH. The plant is housed in a steel framed galvanized sheathed structure, erected on concrete foundations and built directly over the shaft collar. The attached photo CONTENTS engraving shows the general view of the plant. Drawing No. 13140, Sheet 3, shows the elevations of the Papers (cont’d).................................................................. 1 building. The walls and roof are of “sandwich” Air Heating Plant—Davis-Geneva Mine, by F. E. Boyd 1 construction, i.e., they consist of an outer and inner An Unusual Connection Survey at the Newport-Bonnie sheet of galvanized steel, separated by 1¼-in. thick Mines, by L. M. Scofield ................................................ 5 spacers, and the space is filled with 2-in. Rockwool bats. A Modern Change House on the Gogebic Iron Range, The details of this construction are shown on Drawing by D. S. Young .............................................................. 7 No. 13140, Sheet 4. Wire Netting in Top Slicing Operations in the Air enters the fan house through a louver opening in the Cleveland-Cliffs Iron Company’s Negaunee District, by south elevation (See Drawing No. 13140, Sheet 3). It F. J. Haller ................................................................... 11 first passes through weather louvers, then through a Economics of Minnesota Iron Ores, by O. A. motor controlled ball bearing; steel framed face damper Sundness..................................................................... 13 and two balanced by-pass dampers, then through two Sinking a Mine Shaft Half a Mile Deep, by J. C. banks of Aerofin Flexitube heating coils each consisting Sullivan ........................................................................ 18 of four 18 tube wide sections 10-ft. long, thence into the Gravity Concentration of Ironwood Formation, by F. J. fan, Aquastats and Webster 026 traps are placed on the drip lines from the coils. The fan is a Clarage Class II, Tolonen........................................................................ 25 double inlet, double width unit of non-overloading type Biographical..................................................................... 36 and designed to deliver 70,000 c.f.m. against a Index of Biographies published in previous Volumes ..... 40 resistance pressure of 5-in. water gauge. It is of the top horizontal discharge arrangement and its shaft is General Index.................................................................. 41 mounted on Fafnir ball bearings. The drive is through Texropes from a 100-h.p., 875-r.p.m. induction motor. The power requirements of the fan were but 75 h.p. under the above-named conditions, but a larger motor was used so that additional air could be provided up to 90,000 c.f.m. if desired. The fan is now operating at the increased capacity. *Steam Engineer, Oliver Iron Mining Company. The heating coils and the fans are housed in an air-light room, contracted of No. 18 U. S. gauge galvanized steel sheets supported on a structural steel frame. The discharge duct of the fan is of the same gauge of material. This duct leads horizontally to the outer wall of the north elevation of the fan house (see Drawing No. 13140, Sheet 3), the opening being provided with a hinged cover. Midway of the length of the discharge duct, a branch turns downward from the underside to Proceedings of the LSMI – Vol. XXX – September 14 and 15, 1939 – Page 1 of 50 connect to the mine shaft. Two hinged gates or dampers are provided, one in the main horizontal portion of the duct to close the branch and so provide a direct discharge from the fan to the outside of the fan house. The other is in a concrete passage leading to the fan room and serves to divert the air under reversed operation into the fan room. By removing the cover from the end of the main duct, closing the branch damper and opening the damper in the concrete passage, the direction of air flow into the mine is reversed. Normally this flow is clown the Davis Shaft and up the Geneva Shaft. Under the conditions of reversed flow, the fan room is under sub-atmosphereic pressure so that it is necessary to seal the entrance louvers with canvas closures which are provided for the purpose. Air locks are also provided so that one can enter the fan house and also the mine shaft when the fan is in operation. For details of the reversing dampers, see Drawing No. 13179, and for details of the concrete passage from the shaft into the fan house, see Drawing No. 13139. Air Heating Plant—Davis-Geneva Mine Proceedings of the LSMI – Vol. XXX – September 14 and 15, 1939 – Page 2 of 50 It is delivered in tank cars and unloaded into four reservoirs, converted from old 72-in. x 18-ft. H. R. T. boilers that originally stored oil for use in shop forges. The oil is piped by gravity from these reservoirs to the supply tank in the boiler room and its flow is regulated by a float valve. For location of the oil reservoirs relative to the fan house, see Drawing No. 13696, and for the arrangement of the boiler plant, steam piping, oil supply tank and miscellaneous details, see Drawing No. 13153. Gas for the ignition is furnished by cylinders of Pyrofax, located outside the fan house convenient for connection to the oil burner. (See photographic cut of ventilating plant). The control of air temperature is effected by Barber Coleman apparatus consisting of a ductstat mounted in a dust and moistureproof case located in the mine shaft and operating reversible oil immersed damper motors having built-in relays. Current is 110 volt, 60 cycle. This control is supplemented by a Bristol 2-pen recording thermometer, Model 340-M, which simultaneously records temperatures of cold air and heated air. The following tabulation gives operating data of the Davis heating plant for a typical cold weather month: A test was made to determine the length of time required to reverse the flow of air into the mine and it was found that this could be done in 2½ minutes. Steam for the heater coils is furnished by one No. 421 Kewanee firebox boiler designed for operating at 15 lbs. per sq. in. The boiler is fed by a Chicago Pump Company’s No. 1667 vertical condensation pump which receives the water from the hearting coils and discharges it directly to the boiler. The pump is located in the fan room. The boiler is also equipped with a McDonnel & Miller No. 306 safety boiler feeder. The stack is of steel 33-in. in diameter x 70-ft. high, of self- supporting construction. The boiler is fired by an S. T. Johnson Company’s size 5½, Type 30-AV heavy duty rotary oil burner, having electric gas ignition and operated by a 2-h.p., 3-phase, 60-cycle, 440-volt motor. The controls are Minneapolis Honeywell. The fuel, which is of the type known as Placedo or Refugio, and which comes from South eastern Texas, is of the following average specifications: Proceedings of the LSMI – Vol. XXX – September 14 and 15, 1939 – Page 3 of 50 enclosed on three sides by a tubular post woven wire fence, the hoist house encloses it on the fourth side. Geneva Headframe and Drill Shop—Change House in Background Davis Hoist, Headframe and Fan House This hoist house is a frame, galvanized sheathed structure, 17-ft. 3-in. wide x 21-ft. 6-in. long x 8-ft. join, inside height, and is located 115 ft south of the air shaft. It contains a 48-in. diameter x 36-in. face geared hoist driven by a 150-h.p. 440-volt, 3-phase wound rotor motor equipped with a 440-volt solenoid brake on the motor shaft, and the necessary control equipment. This equipment consists of a contactor panel operated by a drum controller, motor secondary resistors, a Model “D” Lilly hoist controller, together with the necessary telephone, signal and safety equipment. This hoist is used only for shaft inspection and repair, and a foot- operated switch is used to allow the hoistman to Geneva Headframe and Change House energize the solenoid brake to lower the cage slowly on the hand band brake. The 100-h.p. squirrel cage fan motor in the fan house is controlled by a magnetic compensator, pushbutton starter, and interlocked with the no-volt surface contact aquastats mounted on the Aerofin heating coils. The arrangement is such that if the temperature of the return pipe from any of the heating coils drops below 180 degrees the fan will stop. Switches are inserted in this circuit so that the fan can be operated independently of these aquastats for summer use. The 350,000-c. m. rubber insulated, lead covered cable from the hoist house serving this fan also provides power for the 2-hp. oil burner motor, the 1½-h.p. condensation pump., and the 5-KVA lighting and control transformer.
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