“International Society of Electrostatic Precipitation
On the Choice of ESP Design for a Multitude of World Low Sulphur coals
…
A specified coal should cover a deviation on some critical parameters in order to give the customer flexibility and to maintain guaranteed emissions when the fired coal varies somewhat from the specified one.”
( http://www.isesp.org/ICESP IX PAPERS/ICESP 09 B04.pdf )


“International Atomic Energy Agency (IAEA)
Analysis of a wire-duct electrostatic precipitator under dust loading conditions
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Smoke of fired coal is used as a source of seed particles of PM10 category (with 75-80% of particles lying below 10 μm). A group of experiments were carried out under laboratory conditions.”
( http://inis.iaea.org/search/search.aspx?orig_q=RN:42073767 )


“ASTM International - ASTM D5759 - 12
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1.1 This guide recommends standards for the characterization of fly ash from the combustion of coal, fly ash from coal combusted in the presence of alkaline materials, and fly ash from combusted coal in which the flue gases have been treated with alkaline materials in the presence of the fly ash.”
( http://www.astm.org/Standards/D5759.htm )


“United States Environmental Protection Agency
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Fly ash is the fraction of combusted coal that becomes suspended in plant flue gases. The fly ash available for beneficial use is captured primarily by mechanical particulate collection devices, such as an electrostatic precipitator or baghouse.”
( http://www.epa.gov/wastes/conserve/imr/ccps/pdfs/ccr_bu_eval... )