513
5 CONCLUSIONS
In the paper a selected issues of efficiency of underground machines have been discussed.
The main purpose of the work was to propose a procedure to confirm that utility of the
installation of lock-up system in underground machines operated in deep copper ore mine is
technically and economically reasonable. We have proposed the plan of an experiment and
procedure of data analysis to obtain a set of performance indicators, that could confirm
benefits of using lock up system.
It has been found that the indicators extracted based on operating parameters, in particular related to fuel consumption, are significant smaller (8.93% overall) for used lockup. If
one consider the machine regime “driving” only, savings are at a level of 10.74%. It allows to
achieve real economic effects (there are more than 1000 machines in the taken into consideration company). It is also important that decreased fuel consumption results also in reducing
the amount of exhaust gas emitted by the machine. It might be considered as a significant
benefit taking into account ventilation cost and geometry of mining works (tunnels).
It was also confirmed, that while using lock up, RPM engine speed is higher, that means
more efficient engine-based brake.
Figure 8. Influence of lock up system on oil temperature.
Table 2. Comparison of results for WO 168L, CB4 20TB with lockup.
Parameter
Lockup off
Lockup on
Engine operation [h]
70,13
57,04
distance[km]
101,45
129,70
Fuel consumption in total [l]
411,33
478,91
Fuel consumption (idle) [l]
38,82
53,85
Averaged fuel consumption/1 km [l/1 km]
4,05
3,69
Averaged fuel consumption/1 km without idle [l/1 km]
3,67
3,28
Averaged fuel consumption/ h of engine operation [l]
10,86
9,8
Averaged operation time/day (24h) [h]
13,06
12,76
Operation with lockup [%]
0
68%
Averaged save in total
8,93%
Averaged save for driving machine only
10,74%
Averaged temperature of oil
60,14
54,74
-
GROILT -
SPEED -
RPM
70 ~--------------------------------------------------------------------------------T '~
30
2019-01-29
locku p off
2019-02-01
lockup on
2000
I~
1000
500
5 CONCLUSIONS
In the paper a selected issues of efficiency of underground machines have been discussed.
The main purpose of the work was to propose a procedure to confirm that utility of the
installation of lock-up system in underground machines operated in deep copper ore mine is
technically and economically reasonable. We have proposed the plan of an experiment and
procedure of data analysis to obtain a set of performance indicators, that could confirm
benefits of using lock up system.
It has been found that the indicators extracted based on operating parameters, in particular related to fuel consumption, are significant smaller (8.93% overall) for used lockup. If
one consider the machine regime “driving” only, savings are at a level of 10.74%. It allows to
achieve real economic effects (there are more than 1000 machines in the taken into consideration company). It is also important that decreased fuel consumption results also in reducing
the amount of exhaust gas emitted by the machine. It might be considered as a significant
benefit taking into account ventilation cost and geometry of mining works (tunnels).
It was also confirmed, that while using lock up, RPM engine speed is higher, that means
more efficient engine-based brake.
Figure 8. Influence of lock up system on oil temperature.
Table 2. Comparison of results for WO 168L, CB4 20TB with lockup.
Parameter
Lockup off
Lockup on
Engine operation [h]
70,13
57,04
distance[km]
101,45
129,70
Fuel consumption in total [l]
411,33
478,91
Fuel consumption (idle) [l]
38,82
53,85
Averaged fuel consumption/1 km [l/1 km]
4,05
3,69
Averaged fuel consumption/1 km without idle [l/1 km]
3,67
3,28
Averaged fuel consumption/ h of engine operation [l]
10,86
9,8
Averaged operation time/day (24h) [h]
13,06
12,76
Operation with lockup [%]
0
68%
Averaged save in total
8,93%
Averaged save for driving machine only
10,74%
Averaged temperature of oil
60,14
54,74
-
GROILT -
SPEED -
RPM
70 ~--------------------------------------------------------------------------------T '~
30
2019-01-29
locku p off
2019-02-01
lockup on
2000
I~
1000
500