On which factor does the value of coal depend on?

On what factor does the percentage of carbon in coal depend?

Formation of Coal

Percentage of carbon in coal depends upon the duration and intensity of heat and pressure on wood. [carbon content also depends on depth of formation. More depth == more pressure and heat == better carbon content].

On which factor does the calorific value of coal depend on * Ash content B size of coal particles C moisture content D volatile material?

The calorific value of the coal depends upon its ash content. Less the ash content present, more is the calorific value of the fuel i.e. the fuel which has less ash content produces more energy on burning.

How is the heat value of coal determined?

Calorific value is a measure of the amount of energy produced from a unit weight of coal when it is combusted in oxygen. A measured sample of coal is completely combusted in a bomb calorimeter, which is a device for measuring heat (ASTM method D5865-12; American Society for Testing and Materials, 2013, p. 648–666).

When the calorific value of coal sample is higher?

Higher the Calorific Value lesser the amount of the coal required per unit of electricity. Higher calorific value also means the cost of the coal is higher but is offset by the lower cost of logistics, storage and ash disposal. The calorific value of coal is the heat liberated by its complete combustion with oxygen.

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What are the 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.

Which coal has highest ash content?

Coking coal– the carbon content is around 43%-86%. It is a type of bituminous coal. Hence, lignite has the least carbon content which means that it has the highest ash content.

What is the percentage of ash content in Indian coal?

Indian coals typically have ash content in excess of 40 percent. Attaining an ash content of 34 percent or less after washing at reasonable yields may be extremely difficult for the majority of Indian coal mines.

What does calorific depend on?

The calorific value of a fuel depends upon the nature of the fuel and the relative proportions of the elements present . it increases with increase amounts of hydrogen and decreases with the moisture content present in the fuel.

What is the GCV of coal?

The gradation of non-coking coal is based on Gross Calorific Value (GCV), the gradation of coking coal is based on ash content and for semi coking /weakly coking coal it is based on ash plus moisture content, as in vogue as per notification.

Coal Grades.

GCV BAND (K.Cal./Kg.) GRADE
Exceeding 2200 and not exceeding 2500 G-17