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What are the concepts of Wuzi coal and Sanba coal?
25 grains: refers to the size and specifications of lump coal, and the unit is cm. 25- seed coal: generally speaking, it refers to granular coal larger than 2CM-5CM. Therefore, Erwuzi coal generally refers to 2CM-5CM granular coal. 25- seed coal is pure granular coal screened by coal screening machine from various producing areas, and large coal and pulverized coal such as gangue are removed in the middle.

March 38: refers to the size and specification of lump coal, in cm cm. Lump coal: generally refers to lump coal larger than 1.5cm, therefore, March 8th lump coal refers to lump coal with specifications of 3cm-8cm. In addition, the volatile matter of smokeless March 8 coal is basically below 10.

Extended data:

Lump coal use

1. Coal for power generation: about 1/3 of coal in China is used for power generation. At present, the average coal consumption for power generation is about 370 g/(kW h). Power plants use the calorific value of coal to convert thermal energy into electric energy.

2. Coal for steam locomotives: accounting for about 2% of power coal, and the average coal consumption index of steam locomotive boilers is about 100kg/ (ten thousand tons km).

3. Coal used for building materials: accounting for more than 10% of thermal coal, coal used for cement is the most, followed by glass and brick.

4) Coal for general industrial boilers: In addition to thermal power plants and large-scale heating boilers, there are many types of industrial boilers for general enterprises and heating, and the coal consumption accounts for about 30% of thermal coal.

5. Domestic coal: The amount of domestic coal is also relatively large, accounting for about 20% of fuel coal.

6. Metallurgical power coal: Metallurgical power coal is mainly anthracite for sintering and blast furnace injection, and its consumption is less than 65,438+0% of that of power coal.

Baidu Encyclopedia-Erwu Seed Coal

Baidu encyclopedia-sanba lump coal