AshScan - Online Coal Analyzer
The AshScan Online Coal Analyzer provides realtime, continuous data on total ash content in coal. Using DUET (duel energy transmission) technology, also known as LET (low energy transmission), the AshScan is a tried and proven performer suitable for most coal types.Ash consists mainly of oxides of Silicon (Si), Iron (Fe), Aluminium (Al) and Calcium (Ca).
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The AshScan measures the combined total of these elements which directly correlates to the total ash content in coal.The DUET technique uses two radioactive sources; Am-241 and Cs-137. Am-241 is a low energy gamma radiation. Absorption of Am-241 gamma rays occurs due to the presence of Si, Fe, Al and Ca, and the amount of coal on the conveyor. Cs-137 is a high energy gamma radiation. Absorption of Cs-137 gamma rays is due only to the amount of coal on the conveyor. This allows the Am-241 measurement to be normalised for bed depth. The normalised Am-241 absorption is then correlated to total Ash content by calibrating against laboratory reported ash sample results.The AshScan is suitable for both raw coal and washed coal where ash chemistry is relatively stable and where the bed depth of the coal does not exceed 350mm.Its practical design incorporates many unique features not available in other through belt ash gauges. The AshScan on-belt coal analyser’s modern electronics, communications and human machine interface makes set-up, calibration and ongoing verification of accuracy simple and straightforward.The AshScan is commonly used in the coal and power industries for:
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