Coke is a kind of solid fuel. The coal is obtained by dry distillation under the condition of about 1000 ℃. The main components are fixed carbon, followed by ash, the volatile and sulfur content are very small. Silver-gray, metallic luster. Hard and porous.

　　Coke is also known as "Coke Block", "Coke slag". When the coal is heated to more than 850 ℃ in the boiler furnace, as the temperature rises, the organic matter in coal is decomposed, and after the volatile products escape, the nonvolatile products are coke. These include the burning of fixed carbon and burning residue-ash. The fire emits a very short blue flame and emits a lot of heat. The combustion process is slow and durable, and it is easy to form a gray shell on the surface. Coke can also be used in the fertilizer industry, the use of coke and water vapor, air action, made of half a gas, and then the hydrogen and the air nitrogen combined to generate ammonia. Coke is also the production of acetylene, melamine, carbon and electrodes and other reactants, but also the city's gas industry is an important raw material. From the distribution of coke production in China, the regional distribution of coking enterprises in China is unbalanced, which mainly distributes in north China, east China and northeast region.