Roughly 24 Megajoules per kilogram-it obviously varies in quality. 1 MJ = 947.8 BTU.
1 kg = 2.2 lb. So in US units, calorific heat of coal = 10,340 BTU/lb
The calorific value of lignite coal ranges from 4,000 to 8,300 kilocalories per kilogram.
Anthracite has the highest calorific value. and South African coal is best in the world.
Calorific Value of Coal can be determined by employing an apparatus called the Bomb Calorimeter. However, this instrument is expensive. Alernatively, you can send the sample to an INDEPENDENT laboratory who normally carry out the test for a certain fee. Less accurate measurements can be made using a thermometer, an insulated contained and a known amount of coal.
Volatile substances in coal tend to increase the calorific value as they can release more energy during combustion. On the other hand, high moisture content in coal reduces the calorific value by absorbing some of the heat energy during combustion to evaporate the water. Overall, the presence of volatile substances can have a greater impact on the calorific value compared to water content.
The calorific value of coal varies depending on the type of coal, but on average it is around 24-35 million joules per kilogram (MJ/kg). This means that coal can release a significant amount of heat energy when burned, making it a valuable source of energy for power generation and heating.
The calorific value of lignite coal ranges from 4,000 to 8,300 kilocalories per kilogram.
Anthracite has the highest calorific value. and South African coal is best in the world.
Coal
Gross calorific value of coal
what is the differnence between gross calorific value and useful heat value
gross calorific value
NCV means Net Calorific Value. The lower calorific value or Net calorific value (NCV) which supposes that the products of combustion contain the water of combustion to the vapor state. The heat contained in this water is not recovered.
To calcualte NCV you need calorific value on GAR, H on gar and Total moisture.
Calorific Value of Coal can be determined by employing an apparatus called the Bomb Calorimeter. However, this instrument is expensive. Alernatively, you can send the sample to an INDEPENDENT laboratory who normally carry out the test for a certain fee. Less accurate measurements can be made using a thermometer, an insulated contained and a known amount of coal.
Coal-peat-lignite-dried wood
Useful heat value(UHV) pricing mechanism of coal deducted ash and moisture content from standard formula and in this coal is categorised into 7 grades. Gross calorific value(GCV) of coal has 17 grades and prices are linked to the actual calorific value/quality of coal-by latika joshi
Volatile substances in coal tend to increase the calorific value as they can release more energy during combustion. On the other hand, high moisture content in coal reduces the calorific value by absorbing some of the heat energy during combustion to evaporate the water. Overall, the presence of volatile substances can have a greater impact on the calorific value compared to water content.