How coal is Analysed?

There are two methods to analyze coal which are called proximate analysis and ultimate analysis. The proximate analysis determines only the fixed carbon, volatile matter, moisture and ash percentages and it can be determined with a simple apparatus.

Is coal a method of analysis?

1.1 This standard (Part 1 ) prescribes the methods of test for coal and coke relating to proximate analysis including determination of moisture under different conditions. … Besides, the laboratory samples to be used for the analysis of coal and coke, special samples are recommended for moisture.

What are the types of coal analysis?

Some of the Common Tests conducted on Coal include

  • Calorific value(Gross/net)
  • Proximate analysis- Moisture,Volatile matter, Ash and Fixed Carbon.
  • Ultimate analysis – C,H, O, N, S and Ash.
  • Ash analysis – Al2O3, SiO2, CaO, MgO,TiO2, Na2O, K2O, S etc.,
  • Ash Fusion Temperature.
  • Coke Reactivity.
  • Hard-grove Grindability Index.

What is proximate analysis of coal?

Proximate analysis is formally defined by a group of ASTM3 test methods and is an assay of the moisture, volatile matter, fixed carbon, and ash content of a coal sample. … The moisture content is determined by the mass loss that a coal sample undergoes after it has been heated to 110 °C under a N2 atmosphere.

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What are the 4 grades of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.

How is coal GCV calculated?

Calculate a) Gross calorific value, moist basis b) Net calorific value, dry basis c) Net calorific value, moist basis d) Gross calorific value, dry basis using Dulong formula. = 32060.2 KJ/Kg NCV = GCV – 24.44(9×%H + %M) = 30630.26 KJ/Kg Thus NCV = 0.955 times GCV in this case.

How is the quality of coal determined?

The most common classification is based on rank, referring to the degree of coalification that has occurred. The rank of a coal is determined primarily by the depth of burial and temperature to which the coal was subjected over time. With increasing temperature, peat is converted to lignite, a very soft, low-rank 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.

Which country has the best quality coal?

Experts told Fact Check that Australia’s coal is on average high quality as a result of its low moisture and ash content, and high carbon content, compared with other countries, particularly Indonesia, the largest coal exporter in the world.

What is the difference between anthracite and coal?

Anthracite differs from ordinary bituminous coal by its greater hardness (2.75–3 on the Mohs scale), its higher relative density of 1.3–1.4, and luster, which is often semi-metallic with a mildly brown reflection. It contains a high percentage of fixed carbon and a low percentage of volatile matter.

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What are the properties of coal?

Other properties, such as hardness, grindability, ash-fusion temperature, and free-swelling index (a visual measurement of the amount of swelling that occurs when a coal sample is heated in a covered crucible), may affect coal mining and preparation, as well as the way in which a coal is used.

What is the GCV of coal?

The gradation of non-coking coal is based on Gross Calorific Value (GCV), the gradation of coking coal is based on ash content and for semi coking /weakly coking coal it is based on ash plus moisture content, as in vogue as per notification.

What is VM in coal?

Volatile matter is one of the most common parameters measured in coal. … It is measured as the weight percent of gas (emissions) from a coal sample that is released during heating to 950 C° in an oxygen-free environment , except for moisture (which will evaporate as water vapor), at a standardized temperature.

Which country has the cleanest coal?

Russia’s

Which type of coal is best quality of coal Why?

Anthracite

Which coal has highest ash content?

lignite

Coal mine