Why is moisture undesirable in coal?
Why is the high percentage of moisture undesirable for coal? Explanation: Moisture acts as a barrier in combustion which consequently decreases the calorific value of the coal. Moisture can be removed by drying the coal and the transportation of coal becomes easy.
What is moisture of coal?
Moisture is an important property of coal, as all coals are mined wet. … Surface moisture: water held on the surface of coal particles or macerals. Hygroscopic moisture: water held by capillary action within the microfractures of the coal. Decomposition moisture: water held within the coal’s decomposed organic compounds.
What is equilibrated moisture in coal?
n) “Equilibrated Moisture” means moisture content, as determined after equilibrating at 60% relative humidity (RH) and 40 degree Celsius as per the relevant provisions (relating to determination of equilibrated moisture at 60% RH and 40 degree Celsius) of BIS 1350 of 1959 or amendment thereof.
Is moisture in coal wasteful?
Moisture absorbs heat, so high moisture content in coal reduces the relative efficiency of heating when a coal is combusted. This is why low-rank, high-moisture coals have lower calorific values (Btu/lb) than high-rank, low-moisture coals.
Does coal absorb moisture?
Charcoal will absorb moisture from the air. Punch holes in the sides of the coffee can, as well as in the lid, with a small screwdriver or ice pick. Place charcoal in the can and put the lid on. Place in the areas of your house that get the most humidity, such as bathrooms, basements, closets, attics or sun rooms.
What are 4 types of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.
How is coal moisture determined?
Total moisture =X+Y*(1-X/100), Where, X: percentage loss in mass of original in air-drying, Y: percentage loss in mass of air dried sample on oven drying.
What is the ash content of coal?
Ash content of coal produced in the country is generally 25 to 45 % whereas average ash content of imported coal varies from 10 to 20 %. Indian Coal has comparatively higher ash content than imported coal due to drift theory of formation of coal deposits in India.
How do you improve the quality of coal?
(1) Improve Heat Rates The higher the ash content of coal, the lower the heating value of that coal . By removing the ash through washing, the coal’s heating value can be improved dramatically . This means that less coal must be burned to produce a comparable amount of electricity .