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as peat(90% moisture) is not regarded a rank of coal so lignite is the lowest grade of coal containing moisture as high as 30%.
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What forms of coal has the highest carbon content?
Anthracite.
What is the type of coal that contains the highest carbon content?
Anthracite
As coal forms how does its carbon content change?
It compacts and increases as moisture and volatile hydrocarbons are driven off. Coal has a carbon content between 75 and 90 % , lignite (brown coal) hasn't completed the transformation and contains more moisture and nitrogen than bituminous or anthracite coals. Lignite has about 30 to 40% carbon content.
What type of coal has the most desirable burning properties and highest energy content?
Anthracite has the highest energy
What is the highest moisture content allowed in steam turbine?
it is a composition of dryness fraction (1-x) .
Short note on different varieties of coal?
There are four types of coal as under:Lignite coalUsed almost exclusively for electric power generation lignite is a young type of coal. Lignite is brownish black, has a high moisture content (up to 45 %), and a high suphur content. Lignite is more like soil than a rock and tends to disintegrate when exposed to the weather. Lignite is also called brown coal. Lignite has a colorific value of less than 5 kw/kg approximately.Subbituminous coalSubbituminous coal is also called black lignite. Subbituminous coal black and contains 20-30 % moisture. Subbituminous coal is used for generating electricity and space heating. Subbitumnious coal has calorific values ranging from 5 - 6.8 kW/kG approximately.Bituminous coalBituminous coal is a soft, dense, black coal. Bituminous coal often has bands of bright and dull material in it. Bituminous coal is the most common coal and has a moisture content less than 20 %. Bituminous coal is used for generating electricity, making coke, and space heating.Bituminous coal has calorific values ranging from 6.8 - 9 kW/kG approximately.Anthracite coalOften referred to as hard coal, anthracite is hard, black and lustrous. Anthracite is low in suplhur and high in carbon. It is the highest rank of coal. moisture content generally is less than 15 %.Anthracite has a calorfific values of around 9 kW/kG or above.
What is free moisture?
free moisture is defined as moisture which is not absorbed by the coal and can be removed by simply drying the coal in air.
What is a soft brown coal with less moisture called?
A soft brown coal with less moisture is called bituminous coal.
Why you are doing initial moisture content critical moisture content and equilibrium moisture content test?
if we know initial moisture content of the object we can identify how much drying energy required for dry the same moist material. if it is a food material we have to reduce the moisture content upto certain level, otherwise it may be destroyed. if we know the initial moisture content of same food object, we can reduce its moisture content upto 10% of its initial moisture content.
How must brown coal be prepared prior to burning?
It can have a very high moisture content so drying it will produce better fuel performance.
Maximum bulking in sand and in what moisture content?
The maximum bulking of sand is in 13% to 14% moisture content. It's likely to be 13.8% moisture content.
What are the types of Moisture content in coals?
free moisture inherent moisture
