What is coal-classification?
Classification of coal based on volatile matter and cooking power of clean material. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Coal - Classification Classification of coal based on volatile matter and cooking power of clean material. Sponsored Links
Why is it important to classify coal?
Most classifications are based on the results of chemical analyses and physical tests, but some are more empirical in nature. Coal classifications are important because they provide valuable information to commercial users (e.g., for power generation and coke manufacturing) and to researchers studying the origin of coal.
What are the different types of coal?
The international classification (for both hard and soft coal—i.e. anthracite, bituminous coal, sub-bituminous coal, and lignite or brown coal) and the new international codification of medium and high rank coals are also covered.
What is the classification of coal by National Board?
CLASSIFICATION BY NATIONAL COAL BOARD Specifically designed for commercial use Rank based Uses 3 digit code to identify main class, class and subclass to which a coal belongs Applicable to vitrinite rich coal Volatile matter in dmmf basis and Gray-King coke type values are considered. 21.
What is coal classified as?
Classification of coal based on volatile matter and cooking power of clean material. Coal is a readily combustible rock containing more than 50 percent by weight of carbonaceous material formed from compaction and indurations of variously altered plant remains similar to those in peat.
What is the last classification of coal?
If improperly fired bituminous coal is characterized with excess smoke and soot. Anthracite coal is the last classification, the ultimate maturation. Anthracite coal is very hard and shiny.
Why is lignite considered an immature coal?
Lignite is considered to be "immature" coal at this stage of development because it is still somewhat light in color and it remains soft.
Is anthracite coal shiny?
Anthracite coalis the last classification, the ultimate maturation. Anthracite coal is very hard and shiny.
Is lignite a bituminous coal?
Lignite increases in maturity by becoming darker and harder and is then classified as sub-bituminous coal. After a continuous process of burial and alteration, chemical and physical changes occur until the coal is classified as bituminous - dark and hard coal.
What is the color of coal?
Subbituminous: Subbituminous coal is black in color and is mainly dull (not shiny). Subbituminous coal has low-to-moderate heating values and is mainly used in electricity generation.
What is the lowest rank of coal?
A sample of lignite, the lowest rank of coal. It is primarily mined for burning in steam-generation power plants. Read more about our coal research here: https://www.usgs.gov/centers/cersc/science/us-coal-resources-and-reserves-assessment
What is the biggest coal deposit in the United States?
The biggest coal deposit by volume is the Powder River Basin in Wyoming and Montana, which the USGS estimated to have 1.07 trillion short tons of in-place coal resources, 162 billion short tons of recoverable coal resources, and 25 billion short tons of economic coal resources (also called reserves) in 2013. The coal in the Powder River Basin is...
What is the name of the coal that is formed by pressure and heat?
This sample is of bituminous coal, a middle rank coal (between subbituminous and anthracite) formed by additional pressure and heat on lignite. Usually has a high Btu value and may be referred to as "soft coal." Read more about USGS coal research here:
What is bituminous coal?
Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. Bituminous coal usually has a high heating (Btu) value and is used in electricity generation and steel making in the United States.
What is coal used for?
Coal is primarily used as fuel to generate electric power in the United States. In coal-fired power plants, bituminous coal, subbituminous coal, or lignite is burned. The heat produced by the combustion of the coal is used to convert water into high-pressure steam, which drives a turbine, which produces electricity.
What is a canning coal?
Cannel coal is a type of bituminous coal that is also sometimes referred to as a type of oil shale. It's name likely came from the word " candle ." Cannel coal was once used as a source for kerosene. Read more about our coal research here:
What are the four types of coal?
The four ranks are: Anthracite : The highest rank of coal.
What is the lowest rank of coal?
A sample of lignite, the lowest rank of coal. It is primarily mined for burning in steam-generation power plants. Read more about our coal research here: https://www.usgs.gov/centers/cersc/science/us-coal-resources-and-reserves-assessment
What is the name of the coal that is formed by pressure and heat?
This sample is of bituminous coal, a middle rank coal (between subbituminous and anthracite) formed by additional pressure and heat on lignite. Usually has a high Btu value and may be referred to as "soft coal." Read more about USGS coal research here:
What is a canning coal?
Cannel coal is a type of bituminous coal that is also sometimes referred to as a type of oil shale. It's name likely came from the word " candle ." Cannel coal was once used as a source for kerosene. Read more about our coal research here:
What is coal used for?
Coal is primarily used as fuel to generate electric power in the United States. In coal-fired power plants, bituminous coal, subbituminous coal, or lignite is burned. The heat produced by the combustion of the coal is used to convert water into high-pressure steam, which drives a turbine, which produces electricity.
What is the USGS coal resource assessment?
The U.S. Coal Resources and Reserves Assessment Project, as part of the U.S. Geological Survey (USGS) Energy Resources Program, conducts systematic, geology-based, regional assessments of significant coal beds in major coal basins in the United States.
Where is the largest coal deposit in the world?
The biggest coal deposit by volume is the Powder River Basin in Wyoming and Montana, which the USGS estimated to have 1.07 trillion short tons of in-place coal resources, 162 billion short tons of recoverable coal resources, and 25 billion short tons of economic coal resources (also called reserves) in 2013. The coal in the Powder River Basin is...
Why is the rank of coal used?
The rank of coal can be used to infer the approximate dry, mineral-matter-free heat value, fixed carbon, and volatile matter in a coal, because the amounts of the constituents vary little within each coal rank. (See table 1 and rank calculation .) rank calculation .--The determination of the rank of a coal.
What is an assessment of coal?
assessment .-- A critical analysis based on integrating, synthesizing, evaluating, and interpreting all available data aimed at a judgment of the geologic nature or economic potential of the coal resources and reserves of an area, field, district, basin, region, province, county, state, nation, continent, or the world. An assessment differs from an estimate, which is a determination of the amount of coal in an area. An estimate or estimates may be the principal data used to assess the coal resources and reserves of an area. See economic assessment and geologic assessment .
What is anthracitic coal?
anthracite or anthracitic .-- A rank class of non agglomerating coals as defined by the American Society for Testing and Materials having more than 86 percent fixed carbon and less than 14 percent volatile matter on a dry, mineral-matter-free basis. (Anthracite is preferred usage). This class of coal is divisible into the semi anthracite, anthracite, and meta-anthracite groups on the basis of increasing fixed carbon and decreasing volatile matter. (See table 1 ).
What is coal agglomerating?
agglomerating .-- Coal that, during volatile matter determinations, produces either an agglomerate button capable of supporting a 500-gram weight without pulverizing, or a button showing swelling or cell structure.
How is coal produced?
Coal is produced by boring into the coal bed much like a carpenter's wood bit bores into wood. An auger consists of a cutting head and screw-like extensions. bed .--. All the coal and partings lying between a roof and floor. The terms "seam" and "vein" should not be used. bench .--.
What is ash free?
ash free .-- A theoretical analysis calculated from basic analytical data expressed as if the total ash had been removed.
What is ash content?
ash .-- The inorganic residue remaining after complete incineration of coal. ash content.--The percentage of a laboratory sample of coal remaining after incineration to a constant weight under standard conditions following D-2795-69 (ASTM, 1981, p. 335-342).
What is coal grade?
Coal grade is an economic or technological classification of the relative quality of a coal for a particular use. A variety of grades of coal are defined for different uses or markets in different industries and countries, and for the needs of a particular process or by regulations concerning the process or end-use product.
Is coal a high grade?
For example, a coal which can be used to generate steam for electricity, may not be a high-grade coal for metallurgical uses. Terms such as low-ash or low-sulfur are also examples of grade terms. Different quality grades are used in different coal markets.
