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- Nordell, Bo, et al.
(författare)
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Fracturing of a pilot plant for borehole heat storage in rock
- 1986
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Ingår i: Tunnelling and Underground Space Technology. - : Elsevier BV. - 0886-7798 .- 1878-4364. ; 1:2, s. 195-208
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes research on a pilot plant in Luleå, Sweden. The plant consists of 19 boreholes, 52 mm in diameter, for heat supply and extraction; and 10 boreholes for temperature monitoring. All the boreholes are 21 m deep. The report describes in detail the performance and results of rock mass permeability and borehole permeability tests. It also discusses hydraulic fracturing and explosive fracturing in the boreholes. A simulation model of water flow in the test plant is described. The paper includes conclusions from the test results and recommendations for further study.
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- Rehnberg, Ove, et al.
(författare)
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Controlling diesel emissions underground
- 1982
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Ingår i: World Mining. - 0043-8707. ; 35:6, s. 48-52
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Tidskriftsartikel (refereegranskat)abstract
- An enquiry to the Swedish mining industry included questions concerning planned mine production, mining methods, number and types of diesel-powered equipment, diesel engines, and transmission types of working cycles. The result representing the situation in 1977 in 37 mines are shown. LHD's are the main fuel consumers (50 percent) and the main contaminators of the air. Subsequent work was concentrated on a duty cycle for this type of equipment.
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- Schmidtbauer, Bengt, et al.
(författare)
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Reproduction of transient load cycles of diesel powered mining vehicles by computer control for exhaust emission testing
- 1981
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Ingår i: ISATA 81. - Croydon : Automotive automation.
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Konferensbidrag (refereegranskat)abstract
- A large set of actual load cycles for LHD-machines in hard rock mining was obtained through in field test measurements using automatic monitoring equipment. Based on a statistical analysis of this measurement set, a few representative time records of engine speed and load variations were chosen for emission testing. A dynamic measurement of exhaust emissions during the representative load cycles showed to be in good agreement with corresponding static exhaust emission characteristics. Based on the results of this work, a reference cycle for underground LHD diesel operation has been suggested
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