Coal

1. Brown coal: mostly in block shape, appearing black brown, with a dark luster and loose texture; It contains about 40% volatile matter, has a low ignition point, is easy to catch fire, burns quickly, has a large flame, and emits black smoke; The carbon content and calorific value are relatively low (due to different coal grades in different regions, the calorific value varies greatly), and the combustion time is short, requiring frequent addition of coal.

2. Bituminous coal: Generally in the form of granules, small pieces, or powders, mostly black and shiny, with a fine texture and a volatile content of over 30%. It has a low ignition point and is easy to ignite; High carbon content and heat generation, fast ignition during combustion, long flame, large amount of black smoke, and longer combustion time; Most bituminous coal has stickiness and is prone to slagging during combustion.

3. Anthracite: There are two kinds of coal: powder and small pieces, which are black and shiny with metallic luster. Less impurities, compact texture, high fixed carbon content, up to 80% or more; Low volatile content, below 10%, high ignition point, and less prone to ignition; But it has high heat output, slow ignition at the beginning of combustion, relatively large power after ignition, strong firepower, short flame, less smoke, long combustion time, weak adhesion, and is not easy to slag during combustion. An appropriate amount of coal and soil should be added for combustion to reduce the firepower intensity.

4. Peat: It has the shallowest carbonization degree, low carbon content, and high moisture content, with a Mar value of up to 90%, so it needs to be air dried in the open air before use; The ash content of peat is easily melted, with low heat generation and high volatile content, making it highly susceptible to ignition and combustion.

Peat has good flammability, is easy to ignite and burn, has strong reactivity, low sulfur content, low ash melting point, but low mechanical strength. Therefore, peat has low industrial value and is not suitable for long-distance transportation. It is generally only used as local fuel. Production areas are distributed in southwestern provinces and Zhejiang (West Lake peat) and other places

As of 2011, China is the country with the largest coal production in the world, with a coal production of 3.24 billion tons, equivalent to 1.8004 billion tons of oil equivalent, accounting for 48.3% of the world's total; Secondly, the United States accounts for 14.8% of world production; Australia ranks third, accounting for 6.3% of world production; India and Indonesia rank fourth and fifth respectively, accounting for 5.8% and 5.0% of world production, respectively.

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