By Jerzy Kicki, Jacek Sobczyk
This ebook includes technical papers that have been offered on the foreign Mining discussion board 2004. This occasion goals to assemble scientists and engineers in mining, rock mechanics, and laptop engineering, with the intention to discover and speak about foreign advancements within the box. The ebook is addressed to researchers and pros who paintings within the fields of underground mining expertise, rock engineering and administration of mines.Topics mentioned during this e-book are:- traits within the mining undefined- New suggestions and developments in underground mines- Rock engineering difficulties in undeground mines- usage and exploitation of methane- Prevention measures for the regulate of rock bursts in Polish mines- present difficulties in Ukrainian coal mines.
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Extra info for International Mining Forum 2004
Closer alliances will be formed between equipment manufacturers, coal producers and electricity generating companies. Only the fittest of the fittest companies will survive in the future, and for those, the future looks very bright. REFERENCES Department of Energy—Energy Information Administration Website. National Mining Association Website. Coal Age—February 2003. Joy Mining Machinery. Dychkovsky National Mining University. Dnipropetrovsk, Ukraine International Mining Forum 2004, Kicki & Sobczyk (eds) © 2004 Taylor & Francis Group, London, ISBN 90 5809 607 6 The increase of an overall performance of mines requires consecutive and economically justified complex change of coal extraction technologies according to possibilities given by the modern mechanized longwall sets.
Since motor torque varies with the square of the voltage, any voltage drop has a drastic effect on motor performance. In addition to the increased torque and power, more stable voltage leads to reduced heating of cables, motors and electrical components, positively impacting maintenance and repair costs. International mining forum 32 Figure 10. JOY 12CM27 high voltage Continuous Miner Increased power of motors and related increased size of gearcases allowed for increased total weight of the machine that in turn improved its stability and reduced number of vibration related failures.
Almost without exception, the highest total productivity in terms of total output, output/man/shift, or cost/ton results from longwall mining systems. While the number of longwall faces in the United States is declining steadily, total longwalls keep growing in size, power and output. The average longwall panel is 280 m wide and 2900 m long. The best longwalls produce on average 500,000 to 600,000 tons per month, and 25,000 tons production days are quite common. Continuous miners working in Room and Pillar systems have been achieving high cutting rates, but the system itself is plagued by bottlenecks in the form of inadequate haulage and roof bolting techniques.