Ventilation system - SME
Ventilation system - SME
Ventilation system - SME
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
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.
><br />
><br />
><br />
><br />
><br />
><br />
><br />
<<br />
<<br />
><br />
><br />
><br />
><br />
><br />
><br />
><br />
<<br />
><br />
<<br />
><br />
><br />
><br />
><br />
><br />
<<br />
<<br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
><br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
><br />
><br />
<<br />
<<br />
><br />
><br />
><br />
<<br />
<<br />
><br />
<<br />
><br />
><br />
<<br />
><br />
><br />
<<br />
><br />
><br />
<<br />
><br />
<<br />
<<br />
><br />
<<br />
><br />
><br />
<<br />
><br />
><br />
<<br />
<<br />
><br />
><br />
><br />
<<br />
<<br />
><br />
<<br />
><br />
<<br />
<<br />
><br />
><br />
><br />
<<br />
><br />
<<br />
<<br />
<<br />
><br />
<<br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
><br />
<<br />
><br />
><br />
<<br />
><br />
><br />
<<br />
><br />
<<br />
<<br />
><br />
><br />
<<br />
<<br />
<<br />
><br />
<<br />
><br />
><br />
<<br />
><br />
<<br />
<<br />
><br />
><br />
<<br />
><br />
<<br />
><br />
><br />
><br />
><br />
<<br />
<<br />
><br />
><br />
><br />
><br />
<<br />
><br />
><br />
><br />
><br />
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