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Ventilation system - SME

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14th U.S./North American<br />

Mine <strong>Ventilation</strong> Symposium<br />

<strong>Ventilation</strong> on demand for a high productivity<br />

<strong>Ventilation</strong> on demand for a high productivity<br />

longwall mine project


Location of the mines


Coal Basins of Coahuila<br />

N<br />

1.- Sabinas<br />

W<br />

E<br />

2.- Las Esperanzas<br />

2 1 10<br />

3.- Saltillito<br />

5<br />

6<br />

3<br />

4<br />

S<br />

4.- San Patricio<br />

5.- San Salvador<br />

6.- Adjuntas<br />

9<br />

8<br />

7<br />

7.- Monclova<br />

8.- Castaños<br />

9.- Cuatro Cienegas<br />

10.- Fuentes-Rio Escodido


Company Overview<br />

Minerales Monclova, (MIMOSA) operates three<br />

underground longwall coal mines in the North of Mexico.<br />

Besides these mines, the company has an open pit working<br />

near to the outcrops. The coal is medium to high volatile in<br />

rank and is used to supply the company blast furnace<br />

operations in the city of Monclova, located 120 kilometers far<br />

from the mines.<br />

The three mines develop approximately 35,000 meters/year<br />

and the longwall retreat rate is an average of 4,000<br />

meters/year for a total coal production in 2011 of 6500,000<br />

tons. ( run of mine. )<br />

Each mine is equipped with one longwall and the<br />

development of the longwall panels is performed with 17<br />

roadheaders using a dual-entry <strong>system</strong>.


Company Overview<br />

2011 Coal production 6,500,000 tons R.O.M.<br />

Product Metallurgical coal<br />

Mining method Longwall<br />

Longwalls size 3.0 km long and 300 meters<br />

wide<br />

Current Operation depth 350 meters<br />

Future operation depth 500 meters<br />

Conditions High methane content<br />

CH4 drainage <strong>system</strong>s Horizontal directional,<br />

and rotary drilling, gob<br />

wells


Coal production and methane generation<br />

250 7.0<br />

CH4 vent. m3/year ( millions ) CH4 deg. m3/year ( millions )<br />

ions )<br />

CH4 m3/ /year ( mill<br />

R.O.M. tons/year ( millions )<br />

200<br />

5.6<br />

150<br />

4.2<br />

100<br />

2.8<br />

50 1.4<br />

R.O.M. Tons s./year ( mi llions )<br />

0<br />

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011<br />

0.0


Methane drainage drilling statistics<br />

60,000<br />

50,000000<br />

Met ters/year r<br />

40,000<br />

30,000<br />

20,000<br />

Methane drainage drilling<br />

10,000<br />

0<br />

1,992<br />

1,994<br />

1,996<br />

1,998<br />

2,000<br />

2,002<br />

2,004<br />

2,006<br />

2,008<br />

2,010


MIMOSA’S Mine VII Project<br />

• Is the newest mine of the company<br />

• It is located in the Saltillito coal basin<br />

• The mine started in 2001 and since then trough December<br />

2011 it has driven 80,500 meters of developments.<br />

• Four longwall panels have been mined for a total coal<br />

production of 12.3 millions of tons R.O.M.<br />

• The project has a total of 30 million tonnes of recoverable<br />

coal resources remaining.<br />

• The operation depth goes from 120 to 500 m.<br />

• The main access is through three slopes supported with<br />

steel arches with a cross section of 16 m 2 .


MIMOSA’S Mine VII Project<br />

• This slopes are the intake of fresh air of the mine and also<br />

one of them is used to bring the coal to the surface with the<br />

main belt, other one is used for materials supply and the<br />

last is used for people transportation.<br />

• The seam thickness is 3.2 meters and the longwall panels<br />

length in the east side of he mine is 3.0 kilometers and in<br />

the west side 2.2 kilometers.<br />

• The current longwall width is 250 meters but in the short<br />

term it will be 300 meters.<br />

• The coal seam has an inclination of 9 degrees.<br />

• The in seam methane concentration goes from 8 to 22<br />

m 3 /ton.


Mine Layout<br />

and coal seam depth curves in meters


Main <strong>Ventilation</strong> <strong>system</strong><br />

• The primary fan is a SPENDRUP 335-184-880 with a 2,000<br />

horsepower and 900 rpm electric motor and the backup fan<br />

is other fan of the same model equipped with a 800 h.p.<br />

diesel engine.<br />

• The current air volume handled for the main fan is 350<br />

m 3 /swith apressureof 1.97 Kpa and amethane generation<br />

of 3.2 m 3 /s. ( June 2012 )<br />

• The mine uses exhausting ventilation <strong>system</strong> with the<br />

main fan on the surface connected to the mine trough a<br />

vertical shaft with 6 meters diameter.


Main <strong>Ventilation</strong> <strong>system</strong><br />

• All the electric ect c equipments e underground d are aepermissible<br />

e<br />

• There are methane monitors installed at the main returns,<br />

at the development faces and the tailgate in the longwall.<br />

• These monitors shut down the electric power if the<br />

methane concentration in the environment reaches more<br />

than 1.0% at the working faces and 1.5% or more at the<br />

main returns.<br />

• All the monitors are connected to a computer on the<br />

surface continuously recording all the measurements.


50 5.0<br />

Main fan performance curves<br />

40 4.0<br />

ressure KPa<br />

P<br />

30 3.0<br />

20 2.0<br />

10 1.0<br />

00 0.0<br />

Current mine resistance<br />

( June 2012 )<br />

0 100 200 300 400 500 600<br />

Q m 3 /s


Main ventilation <strong>system</strong> and longwall<br />

equipment upgrade<br />

• Since the mine started in 2002 until 2004 a medium size<br />

fan was used ( JOY M7236 ), this fan supplied 100 m3/s,<br />

after that a bigger fan ( JOY M9650 ) was installed in one of<br />

the slopes, with this second fan the ventilation of the mine<br />

was gradually increased from 100 to 260 m3/s 2004 to 2010.<br />

• In that way the mine started the first longwall panel in<br />

2007.


Main ventilation <strong>system</strong> and longwall<br />

equipment upgrade<br />

• The first three longwall panels were mined with used<br />

equipment but because the production requirements were<br />

expected to be bigger, a new longwall equipment was<br />

planned to be in operation.<br />

• The ventilation requirements for this were reviewed and a<br />

ventilation shaft with 6 meters diameter was planned and<br />

also the purchasing of a bigger main fan. The new longwall<br />

equipment, the shaft and also the bigger main ( SPENDRUP<br />

335-184-880 ) fan started operations at the beginning of<br />

2011.


Results of the Main ventilation <strong>system</strong> and<br />

longwall equipment upgrade<br />

ROM R.O.M. Tons.<br />

Developments Longwall <strong>Ventilation</strong> Vent. CH 4<br />

mts. meters m 3 /s m 3 /s<br />

2002 19,644 669 0 24 0.000<br />

2003 27,329 899 0 36 0.028028<br />

2004 162,618 5,176 0 96 0.367<br />

2005 353,649 10,844 0 175 1.108<br />

2006 297,361 8,859 0 214 1.017<br />

2007 1,126,650 6,773 836 242 1.205<br />

2008 1,116,914116 13,981 567 268 1.693<br />

2009 2,209,039 11,223 1,043 263 2.036<br />

2010 2,822,490 10,017 1,931 260 1.759<br />

2011 4,132,279 12,001 2,383 340 3.256


Results of the Main ventilation <strong>system</strong> and<br />

longwall equipment upgrade<br />

• The coal production of the mine went from 2.8 million<br />

tons in 2010 to 4.1 million tons in 2011 ( 46% more ).<br />

• The methane generation in the ventilation <strong>system</strong> was<br />

increased from 1.7 to 3.2 m3/s ( 85% more ).<br />

• The total ventilation volume changed from 260 m3/s to<br />

340 m3/s ( 31% more ).


<strong>Ventilation</strong> Project<br />

• The ventilation projections for the mine have been<br />

reviewed using the VNETPC simulation software, this<br />

software has been in use in MIMOSA since 1989 for the<br />

ventilation planning of all the mines and also for analyzing<br />

any major change in the ventilation <strong>system</strong>s.<br />

• The average friction factors for MIMOSA’S entries have<br />

been obtained from ventilation surveys performed in all the<br />

mines using the gauge and tubing method.<br />

• For this case the analysis of the ventilation situation ti for<br />

July 2014 will be reviewed.


Friction factors used for airways<br />

Airway type Friction factor Kg/m 3<br />

Belt entry 15 6 m 2 0.0228<br />

0228<br />

Materials 15 16 m 2 0.0106<br />

Return 16 15 m 2 0.0141<br />

Belt & materials in parallel 16m 5m 2 0.0037<br />

2 returns in parallel 15 16 m 2 0.0035<br />

0035


<strong>Ventilation</strong> simulaton assumptions<br />

• Friction factors for entries according to the table showed.<br />

• Entries cross section 13 m 2 . (The original size is 16 m 2 ,<br />

but the reduction was considered necessary due to<br />

possible floor heaving).<br />

• Entries perimeter 13.5 m.<br />

• Cross section for overcasts 13 m 2 .<br />

• Fan data supplied to the software SPENDRUP 335-184-<br />

880.<br />

• Vertical Shaft diameter 6 meters.<br />

• 1 Longwall and 5 developments sections with 10<br />

roadheaders in operations.


Longwall ventilation requirement<br />

Across the face an air volume of 15 to 20 m 3 /s is used and for methane dilution of the<br />

gas coming out of the gob opening 30 m 3 /s, in this way a total of 50 m 3 /s at the longwall<br />

return are utilized.<br />

This requirement with the statistics of the longwall methane generation with the<br />

current equipment and production rate.


Developments ventilation requirement<br />

In each development section with two roadheaders advancing the dual entry <strong>system</strong><br />

and crosscuts every 120 meters, the ventilation of the faces is performed with<br />

SPENDRUP 112-80-1760 bifurcated auxiliary fans with a 111 kilowatts ( 150 hp.) electric<br />

motor, blowing <strong>system</strong> and 1.0 m diameter layflat ducting.<br />

With this arrangement an air volume of 35 to 45 m3/s at the last open crosscut is<br />

required.


<strong>Ventilation</strong> simulation results<br />

• Total air volume for the mine 396.71 m3/sec.<br />

• Fan pressure 2.606 Kpa.<br />

• Total air volume in the longwall return was 53.56 m3/sec.<br />

• Development sections were supplied with an average of<br />

40 m3/sec. each.<br />

• The total airflow and pressure are according to the main<br />

fan capacity.<br />

• The brake power requirement will be 1292 KW ( 1,739<br />

horsepower ).<br />

• The projected air volumes for the different sections of the<br />

mine are according to the requirements.


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July 2014 ventilation simulation results<br />

42.80<br />

<<br />

396.71<br />

< < < <<br />

< < <<br />

36.90<br />

37.30<br />

43.20<br />

47.00<br />

46.20<br />

R<br />

50.00 00<br />

235.41<br />

85.79<br />

161.30<br />

72.01<br />

(2.606 KPa)<br />

396.71<br />

< < < < <<br />

< <<br />

< <<br />

32.80<br />

65.80<br />

33.00<br />

134.83<br />

129.63<br />

166.17 17<br />

R<br />

R<br />

><br />

50.00<br />

71.46<br />

< <<br />

36.39<br />

188.39<br />

67.66<br />

65.16<br />

66.41<br />

< < < <<br />

< <<br />

< < <<br />

41.49<br />

R<br />

58.61<br />

< < <<br />

84.55<br />

49.55<br />

36.54<br />

57.56<br />

17.03<br />

< <<br />

R<br />

35.00<br />

R<br />

54.11<br />

< <<br />

4 7 .9 4<br />

45.05<br />

36.54<br />

17.03<br />

52.66<br />

5.62<br />

< <<br />

53.56 56<br />

< <<br />

41.21<br />

43.81<br />

22.83<br />

23.38<br />

< <


Conclusions<br />

• The ventilation and longwall equipment upgrade provided for Mine 7<br />

allowed MIMOSA to accomplish the coal production goal of 4.1 million<br />

tons in 2011.<br />

• The coal production increase from 2010 to 2011 was almost 50%<br />

more.<br />

• The main ventilation <strong>system</strong> improvement allowed the mine to deal<br />

with the higher methane generation. ( 85% more from 2010 to 2011 ).<br />

• The projected layout of the mine will be enough to ventilate the<br />

developments and longwall equipments projected to be in operation<br />

for the future years.<br />

• Themethanedrainageprojectoftheminemustbeinplaceforthe<br />

remaining life of the mine.


Methane drainage boreholes location


Mine VII surface instalations

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