Weather short circuit

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In mining, a weather short circuit is the amount of weather that is lost due to various conditions for the downstream mine workings. Such weather currents that have been lost due to a short-circuit are also referred to as loss weather currents.

Basics and origin

The ventilation of the mine building must be planned precisely so that all mine structures are supplied with sufficient weather. The miner must ensure that the fresh weather and the downweather are separated from each other by a suitable system of weather doors , weather locks , weather bridges and weather screens so that no increased weather compensation currents arise. Inadequate separation of the individual weather routes can mean that part of the amount of weather does not flow over the calculated and planned weather route and the individual mine structures are supplied with sufficient fresh weather, but instead is diverted directly into the weather flow. Leaky weather doors, weather crosses and weather sluices lead to losses in the weather flow. Insufficient tightness of the manhole sluices leads to increased weather compensation currents , particularly in the area of chimneys . But also through cracks and fissures in the mountains or through unsealed mining areas , weather short- circuits can occur.

Effects

A short-circuit in the weather leads to a changed distribution of the weather flow, depending on the location in the mine. The weather current always takes the path of least resistance. Due to a short-circuit in the weather, the mine workings behind the short-circuit are no longer adequately supplied with fresh weather. In hard coal mines in particular, this brings with it the risk that firedamp will form in the less well-ventilated mine workings . In addition, a short circuit in the weather can lead to a major overload of the pit ventilator motor .

Individual evidence

  1. ^ A b Walter Bischoff , Heinz Bramann, Westfälische Berggewerkschaftskasse Bochum: The small mining dictionary . 7th edition, Verlag Glückauf GmbH, Essen 1988, ISBN 3-7739-0501-7 .
  2. ↑ Alois Riman, Friedrich Lockert: Project planning and rationalization of coal mines . Springer Verlag Wien GmbH, Vienna 1962, pp. 29, 30, 238.
  3. ^ A b Ernst-Ulrich Reuther: Textbook of mining science. First volume, 12th edition, VGE Verlag GmbH, Essen 2010, ISBN 978-3-86797-076-1 .
  4. ↑ a b c B. W. Boki, Gregor Panschin: Bergbaukunde. Kulturfond der DDR (Ed.), Verlag Technik Berlin, Berlin 1952, p. 600.
  5. ↑ Technical requirements for shaft and inclined conveyor systems (TAS) . Verlag Hermann Bellmann, Dortmund 2005.
  6. ^ F. Giesa: Influence of short circuits in the weather routes . In: Glückauf, Berg- und Hüttenmännische magazine. Association for Mining Interests in the Upper Mining District Dortmund (Ed.), No. 42, Volume 67, October 17, 1931, pp. 1305–1307.
  7. ↑ Remote control and automation in the underground operation of the coal mines in Great Britain and the European Coal and Steel Community . In: Commission of the European Communities (Ed.): Research books coal. No. 18, Luxembourg 1970, p. 14.
  8. ^ Sächsisches Oberbergamt (Hrsg.): Yearbook for the mining and metallurgy industry in Saxony . 105th year, Craz & Gerlach Verlag, Freiberg 1931, pp. 67, 68.