Mar 06, 2015· Coal, as it is commonly known, is a solid fossil hydrocarbon fuel material. The gross calorific value of coal is frequently used when determining the total calorific value for a specific amount of coal for fuel value purposes or when establishing the rank of classification of the coal material.
Anthracite Coal is more normally known as "hard coal". Anthracite coal is a highlycarbonated fossil fuel that will generate the highest heat of all the fossil fuels available, and the low sulfur content in Anthracite makes it an extremely cleanburning fuel. New technology and engineering design changes to burners have made it even easier to use.
Currently, Indian coal is classified on the basis of UHV (useful heat value) into seven grades from AG. UHV is based on ash and moisture contents for noncoking coals in line with the Centre directive. "Now," notes Jha, "these seven grades have seven different prices.
Jun 15, 2019· Lower heating value or gross calorific value (LHV) is calculated under the assumption that water produced turns into vapor. These two different values are used to determine how calorific values apply in the real world with different types of systems.
Gross CVor 'higher heating value' (HHV) is the CV under laboratory conditions. Net CV or 'lower heating value' (LHV) is the useful calorific value in boiler plant.
•In the case of coal having moisture less than 2 percent and volatile content less than 19 percent, the useful heat value are arrived as above reduced by 150 kilo calories per kilogram for each 1 percent reduction in volatile content below 19 percent
Uses of coal. Coal has many important uses worldwide. The most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Different types of coal have different uses. Steam coal also known as thermal coal is mainly used in power generation.
It is considered the lowest rank of coal due to its relatively low heat content. It has a carbon content around 60–70 percent. It is mined all around the world, is used almost exclusively as a fuel for steamelectric power generation, and is the coal which is most harmful to health.
Dec 30, 2018· Anthracite is considered the cleanest burning coal available. It produces more heat and less smoke than other coals and is widely used in handfired furnaces. Some residential home heating stove systems still use anthracite, which burns longer than wood.
Bituminous Bituminous coal contains anywhere from 45 to 86 percent carbon, giving it an even higher heating value than subbituminous. High heat and pressure and between 100 and 300 million years are required to produce this type of coal.
The most common heat transfer method for coalfired boilers is the watertube method in which the hot combustion gases contact the outside of the heat transfer tubes, while the boiler water and steam are contained within the tubes. Coalfired watertube boilers include pulverized coal, cyclone, stoker, fluidized bed, and handfed units.
Surface mining can be used when the coal is buried less than 200 feet underground. In surface mining, giant machines remove the topsoil and layers of rock to expose large beds of coal. Once the mining is finished, the dirt and rock are returned to the pit, the topsoil is replaced, and the area is replanted.
Jan 18, 2017· Answer Wiki. In GCV ( Gross calorific Value) it is asumed that moisture other elements present in coal (besides coal) can be used for generation of Heat and hence ' gross'. While in UHV ( useful heat value) it is assumed that those elements cant produce heat and so are eleminated for the purpose of heat calculation.
Sep 24, 2014 The gradation of noncoking coal is based on Useful Heat Value (UHV), the gradation of coking coal is based on ash content and for semi . Standard Grade Coal Heat Value Engineering ToolBox. Standard grades coal and heating values. Approximate Lower Heating values of standard grades of coal: Coal Grade, Heating Value.
The calorific value of coal is the heat liberated by its complete combustion with oxygen. Most applications which burn fuel produce water vapor which is not used, and thus wasting its heat content.
Coal is classified according to its heating value and according to the percentage of carbon it contains. For example, anthracite contains the highest proportion of pure carbon (about 86 to 98 percent) and has the highest heat value (13,500 to 15,600 Btu/lb; British thermal units per pound) of all forms of coal.