2. Coal: Power plants use the calorific value of coal to convert thermal energy into electric energy; Coal is an important raw material for producing many fertilizers and other chemical products. The main smokeless fuel plants that produce these products use coal gasification to produce syngas. The main chemical products produced directly from syngas include methanol, hydrogen and carbon monoxide, which are the basic components of chemical products.
3. Charcoal: used for smelting high-quality nonferrous metals and cast iron; Used as carburizing agent for mechanical parts to improve the hardness and wear resistance of steel parts; Preparation of gunpowder with potassium nitrate and sulfur; Can be made into graphite. As a solid lubricant, it is very important for rotating parts (graphite as sliding bearing) that cannot use lubricating oil.
Extended data:
Formation mode and properties of coke;
When the coal is heated above 850℃ in the boiler, with the increase of temperature, the organic matter in the coal is decomposed, and after the volatile matter escapes, the remaining nonvolatile matter is coke. These include combustible fixed carbon and combustion residue-ash.
When burning, it will emit a short blue flame and release a lot of heat. The combustion process is slow and lasting, and the surface is easy to form a gray shell. In order to burn out the coke, we should try to remove its ash shell in time. Physical properties of coke (such as cohesiveness, etc. ) has a great influence on the operation of layer combustion furnace.
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