What is high volatile coal?

They are a medium-rank coal. High volatile bituminous C coals have calorific values of 11,500 to 13,000 Btu/lb. High volatile bituminous B coals have calorific values of 13,000 to 14,000 Btu/lb. Above the high volatile bituminous rank, however, calorific values are less distinctive for increasing rank.

What is the definition of coal for kids?

Kids Definition of coal 1 : a piece of glowing or charred wood : ember. 2 : a black solid mineral substance that is formed by the partial decay of plant matter under the influence of moisture and often increased pressure and temperature within the earth and is mined for use as a fuel.

What does high grade coal mean?

High grade They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles). High grade and ultra high grade anthracite are harder than standard grade anthracite, and have a higher relative density.

Is high-volatile matter in coal Good?

The most common volatile matter in coal is water, carbon dioxide, and sulfur dioxide. High-volatile matter may also be associated with spontaneous combustion, especially in low-rank coals (Fierro and others, 1999). Hence, knowledge of volatile matter is important for safety, handling, and transporting coal.

What are the pros and cons of coal?

The Pros of Coal Energy

• The availability of coal makes it very affordable.
• The energy infrastructure supports coal.
• The cost of coal is quite cheap.
• There is no lag time with coal energy.
• Clean coal technologies help to limit the emissions that are released.
• It can be converted into different forms of fuel.

What are 3 interesting facts about coal?

The List

• It takes roughly 1 million years to form coal.
• There are 2 methods to mine coal: surface and underground.
• Coal is mined in 27 US states.
• More than 90% of US coal is used for electricity.
• Coal must be relatively dry before it can be burned successfully.

Which is the highest grade coal?

Anthracite
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. Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite.

What is the dirtiest type of coal?

The combustion of lignite produces less heat for the amount of carbon dioxide and sulfur released than other ranks of coal. As a result, environmental advocates have characterized lignite as the most harmful coal to human health.

What is the role of volatile matter in coal?

Volatile matter is directly related to coal rank; as rank increases, volatile matter content decreases (Stach and others, 1982). Volatile matter has the opposite trend of fixed carbon with rank. As volatile matter is driven from the coal matrix with increasing rank, the relative carbon percentage tends to increase.

Which coal has highest water content?

Anthracite is low in sulphur and high in carbon. It is the highest rank of coal. Moisture content generally is less than 15 %. Anthracite has calorific values around 9 kW/kg or above.

Which is the best definition of high volatile coal?

Definition of high volatile A bituminous coal. The rank of coal, within the bituminous class of the Classification D 388, such that on the dry and mineral-matter-free basis, the volatile matter content of the coal is greater than 31% (or the fixed carbon content is less than 69%), and its gross calorific value is equal to or greater…

How is volatile matter used in coal analysis?

Along with moisture and ash contents, the percentage of volatile matter in a coal sample is needed to calculate the fixed-carbon content of a coal. Many electric utilities prefer coals within a narrow range of volatile matter (25 to 35 percent) for optimal flame stability in the boiler (Thomas, 1992).

Why do electric utilities use high volatile matter?

Many electric utilities prefer coals within a narrow range of volatile matter (25 to 35 percent) for optimal flame stability in the boiler (Thomas, 1992). High-volatile matter may also be associated with spontaneous combustion, especially in low-rank coals (Fierro and others, 1999).

Which is the highest rank of coal in the world?

Anthracite Coal. This is 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.