Coal is a black, inhomogeneous, organic fuel, formed largely from partially decomposed and metamorphosed plant materials. Formation has occurred over long time periods, often under high pressures of overburden and at elevated temperatures.
What are the characteristics and uses of coal?
Coal is black in colour and hard as stone. It is one of the fuels use to cook food. Earlier it was used in railway engines to produce steam to run the engine. It is used as fuel in thermal power plants to produce electricity and in various other industries.18 мая 2018 г.
What are the characteristics of a good quality coal?
Characteristics of Coal
- Anthracite – contains between 86% and 98% carbon by weight and it burns in boilers slowly.
- Bituminous – contains between 69% & 86% carbon by weight.
- Sub-bituminous – contains less carbon, more water and is a less efficient source of heat for boilers.
- Lignite – contains up to 70% water by weight.
What are the 4 grades of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.
What are the uses of coal?
Coal is primarily used as fuel to generate electric power in the United States. The coal is burned and the heat given off is used to convert water into steam, which drives a turbine.
What are the physical properties of coal?
Coal is slightly denser than water (1.0 megagram per cubic metre) and significantly less dense than most rock and mineral matter (e.g., shale has a density of about 2.7 megagrams per cubic metre and pyrite of 5.0 megagrams per cubic metre).
What type of rock is coal?
Coal is a combustible sedimentary rock formed from ancient vegetation which has been consolidated between other rock strata and transformed by the combined effects of microbial action, pressure and heat over a considerable time period. This process is commonly called ‘coalification’.
What is the content of coal?
(Sustainable Energy Strategy, 1995) Page 2 114 CHAPTER 7 Coal is an organic rock (as opposed to most other rocks in the earth’s crust, such as clays and sandstone, which are inorganic); it contains mostly carbon (C), but it also has hydrogen (H), oxygen (O), sulfur (S) and nitrogen (N), as well as some inorganic …
Which coal has highest ash content?
What is the youngest form of coal?
Which country has the cleanest coal?
What is the cleanest type of coal?
Which is the best quality of coal?
Anthracite: The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
What does coal look like?
Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning).
What is the size of coal?
Anthracite CoalProductSize (Inches)%Volatile (DryBasis)Stove2-7/16 X 1-5/84.0 – 4.5Nut1-5/8 X 13/164.0 – 4.5Pea13/16 X 9/164.0 – 4.5Buckwheat#19/16 X 5/164.0 – 4.5Ещё 4 строки