Meaning of various indicator symbols for coal
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What do MM%, Mt%, Aad%, Vad%, Vdaf%, STd%, and Gr1 each represent?
Mad%—moisture, Ad%—ash, Vdaf%—volatile matter, Fcd%—fixed carbon, Std%—total sulfur (on an air-dried basis). G—binding index, X (mm)—thickness of the coking layer, Y (mm)—thickness of the coking layer
In order: Mt%39.8-- The total moisture content is 39.8%； Mad%7.28--Water content on an air-dry basis is 7.28% ； Aad%8.31--Ash on an air-dry basis is 8.31% ； Ad%8.96 -- Ash on a dry basis: 8.96% ； Vdaf%--Volatiles on a dry, ash-free basis ； sT,d%0.30--Total sulfur content is 0.30% ； Qnet,ar%(cal/g) 3513 ---- The lower heating value on a received-base basis is 3513 (cal/g) ； Had%3.20--Hydrogen content on an air-dry basis is 3.20% ； For more detailed information, you can look into books on coal chemistry and similar topics.
ad (air dry) —— air-drying basis； d (dry) —— dry basis ； daf (dry ash free) – dry, ash-free basis, combustible basis ； ar (as received) —— on receipt basis ； Application base ； t (total) —— the whole ； A (ash) —— Ash content ； FC (fixed carbon) —— Fixed carbon ； M (moisture) —— Moisture ； Mt——Total moisture content ； Mad — Moisture on a dry-air basis ； V (volatile) — Volatile components ； Vd——Volatiles on a dry basis ； Vdaf — volatile matter of combustible bases …… and so on for the others.