What is ash fusion in coal?
Understanding how ash or slag will behave in a furnace or boiler is important because both may cause clogging or fouling of equipment (van Krevelen, 1993). Ash fusion, also called fusibility, is a test to determine how the ash residue remaining from combustion of a coal will react in a furnace or boiler.
What is initial deformation temperature of ash?
The ash deformation temperature is an important property of ash melting behaviour. It is defined as the temperature at which the first signs of rounding of the edges of the ash test piece occurs due to melting.
What is the melting point of ash?
For reliable operation of boilers is important to know melting temperature of ash. Melting temperature for low meltable ashes is from 1000 to 1200 °C, for medium meltable ashes from 1200 to 1450 °C and for heavy meltable ashes over 1450 °C.
What is the furnace temperature used for making ash?
Ash samples, for most cases, were prepared at temperatures of 600, 800, 1000, 1200, and 1400OC. Most of the ash types did not show any sign of melting when heated. At temperatures over 800OC, the ash showed signs of sintering but the lump of ash formed would crumble under a slight pressure.
What is aft in coal?
Ash fusion temperatures (AFT) are widely used as a guide to ash agglomeration, clinkering, and slag behavior resulting from the mineral matter transformations of coal sources during gasification.
Does Indian coal has high Sulphur content?
Studies show that the sulphur content in Indian coal is hardly 0.7%, which is not uniformly distributed in the coal but concentrated in the pyritic bands which are visible to the naked eye. The best solution to get rid of sulphur from Indian coal is to wash it.”
What is initial deformation temperature of coal?
Its analysis consists of the determination of four temperatures signifying four phases in the melting of the ash, as described below. Initial deformation temperature (IDT): Temperature at which ash just begins to flow. Softening temperature (ST): Refers to the temperature at which the ash softens and becomes plastic.
How melting point is different from fusion?
Question 1) What is the Difference Between Melting and Fusion? … Change of the solid-state to the liquid state is called fusion solid to liquid, whereas the minimum temperature at which the solid-state shifts to the liquid state at the normal atmospheric pressure is termed the melting point.
What is the composition of coal ash?
Coal ash, a waste product, generated from the combustion of coal, consists of fly ash, bottom ash, boiler slag, and flue gas desulfurization material. Fly ash, which is the main component of coal ash, is composed of spherical particulate matter with diameters that range from 0.1 μm to >100 μm.
Can ash Burn?
Ash: One of the best woods for a steady fire and good heat. Although ash will burn when green, it burns better when seasoned. … It will also burn unseasoned, but can cause gum deposits in chimneys over time. So, don’t use the green wood too often.