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COAL SCANNING
Loy Yang Power is the largest electricity producer and coal mining operation in Victoria, Australia. Its mine supplies two power stations (Loy Yang Power's Loy Yang A and the Edison Mission Energy Loy Yang B) and produces up to 90,000 tpd of brown coal (30 million tpa).
To aid with the management of coal quality to the Loy Yang B power station, an online Coalscan 9100 unit has been installed at the station's coal delivery point. This unit provides valuable real-time feedback to the mine and power station regarding levels of sodium, ash, moisture and energy.
The Coalscan data is fed into the mine's plant control and monitoring system, which has display terminals at the mine control centre, coal plant operator's office and the power station control room. Information gained from the unit can be used to alter blend mixes of the coal to avoid problems later. It is also used to validate the coal quality data used by the mine to determine the coal quality mix.
While the Coalscan 9100 has local digital displays, in order for the information to be accessed outside the switchroom the calculated data can be fed through a MODBUS link into the mine's telemetry network and displayed as part of its Macroview SCADA system. This system is located 6 km away from the sampling plant and is communicated with via dedicated modem lines.
The sampling plant's operation is also monitored via this link, with Coalscan modes, coal levels and conveyor status information being displayed. Data regarding coal qualities can then be referred to the station chemists to be compared with their chemical analyses carried out in the laboratory,
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