RAC System - Rotary Air Curtain

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The RAC system is water based, and uses high pressure water, at a nominal pressure of 100bar to form air movers. A series of air movers are displaced equally around the inside barrel of the shearer drum and force air away from the coal face towards the shearer machine, which has the following beneficial effects.

1. As coal is cut, methane gas is naturally released; the RAC system draws the methane gas through the air moving tubes and dilutes the gas to below an explosive level.
2. As the water saturated air is forced out of the air moving tubes, it is directed across the cutter picks/bits of the shearer drum, this induces fresh air into the cut, it also forms an air curtain around the shearer drum containing any dust that is made, within the cutting zone.
3. The water saturated air, moving across the cutter picks/bits is attracted to any airborne respirable dust and captures the dust turning into slurry.
4. The slurry falls to the floor with the cut product, and
5. The process continues.

The design of the shearer drum will accommodate the appropriate number of air moving tubes, dependent on the predicted methane gas release.