Coal
Coal is one type of fossil fuel that is still widely used today. In general, coal is used as an alternative fuel in industry, especially large-scale industries that require affordable resources.
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In its meaning, this fossil fuel is a sedimentary rock formed from organic deposits. The main components of these deposits are plant remains which are then formed through a long process. The main elements of coal are carbon, oxygen and hydrogen. These elements are what make coal reliable as an energy source.
Although it can be used as an affordable alternative energy source, coal itself has several different types. The difference in coal types is influenced by its quality.
Calories Determine Coal Quality One element that greatly influences the quality of coal is the calorie content in it. This is because of the important role of calories which will create heat energy when the coal is used.
In this case, the higher the calorie content of a coal, the better the quality of the coal. Therefore, the classification process of the types of coal available is based on their calorie content.Types and Quality of Coal According to SNI One of the indicators used to determine the quality of coal is to refer to the Indonesian National Standard. In this case, according to the standardized standards, coal with SNI indicators is divided into two, namely:
Brown Coal
Brown coal or low energy coal is the first type of coal referred to as SNI. As the name implies, this type of coal has a low ranking and has characteristics that tend to be soft, brittle, and contain quite high water content.In addition, brown coal consists of soft low energy coal and lignite coal which shows a wood structure. Judging from the number of calories, brown coal has a calorific value of <7000 per gram in dry-ASTM form.
Hard Coal
Another type of coal according to SNI is hard coal or high energy coal. In this case, all types of coal that have a higher ranking than brown coal which have compact, harder characteristics, and have relatively low water content are included in the hard coal category.Other characteristics of hard coal include the wood structure is no longer visible and is relatively resistant to physical damage that occurs due to handling. When viewed from the calorific value, hard coal has calories >7000 per gram in dry-ASTM form. It can be said that cslories determine the quality of the coal used. Types and Quality of Coal According to ASTM
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