Give the characteristics of good coal sample
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Coal properties have a major influence on the process and gasifier design; they include moisture, ash, volatile matter, and fixed carbon content, caking tendencies, reactivity, ash fusion characteristics, and particle size distribution. Coal is a sedimentary rock composed principally of two basic classes of materials: inorganic crystalline minerals and organic carbonaceous mackerels. The mackerels form the combustible part of the coal and are, in turn, divided into three mackerel groups—vitrinite, exinite (or liptinite), and inertinite.
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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
.Anthracite – contains between 86% and 98% carbon by weight and it burns in boilers slowly.
Bituminous – contains between 69% & 86% carbon by weight
Sub-bituminous – contains less carbon, more water and is a less efficient source of heat for boilers.
Lignite – contains up to 70% water by weight.