The main uses of thermal coal in China are:
1) coal for power generation: about 1/3 coal is used for power generation in China. At present, the average coal consumption for power generation is 370g/(kW? H) around. 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 100kg/ (ten thousand tons? Km)。
3) Coal used for building materials: it accounts for more than 10% of thermal coal, with cement coal being 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 coal used for combustion.
6) Metallurgical power coal: The metallurgical power coal is mainly anthracite for sintering and blast furnace injection, and the consumption is less than 65,438+0% of the power coal.
Question 2: What does 5500 kcal thermal coal mean? All coal used for power generation, locomotive propulsion, boiler combustion and other purposes. It belongs to power coal, referred to as power coal for short. 5500 kcal is the calorific value of thermal coal, 5500 kcal/kg.
Question 3: What are thermal coal and electric coal? What's their difference? Broadly speaking, all coal used for power generation, locomotive propulsion, boiler combustion and other purposes. It belongs to power coal, referred to as power coal for short.
The quality of coal used in thermal power plants is an important basis for boiler design and production technology. The characteristics of coal combustion include two aspects: one is the characteristics of coal quality, and the other is the characteristics of ash. The characteristics of coal refer to moisture, ash, volatile matter, fixed carbon, element content (carbon, hydrogen, oxygen, nitrogen and sulfur), calorific value, ignition temperature, grindability and particle size. These indexes are directly related to combustion, processing (such as grinding into pulverized coal), transportation and storage. Ash characteristics refer to the chemical composition, high temperature characteristics and specific resistance of coal ash. These characteristics have great influence on the cleanliness after combustion, the corrosiveness to steel and the removal of coal ash.
From the category, power coal mainly includes lignite, long flame coal, unbonded coal and lean coal; Gas coal and a small amount of anthracite. As far as commercial coal is concerned, there are mainly washed blended coal, washed coal, pulverized coal and pulverized coal. Inferior coal mainly refers to high ash content (above 40%) and low calorific value (less than 15), which is unfavorable for boiler operation. 73 mj/kg) bituminous coal, low volatile anthracite (less than 10%), low moisture and high calorific value lignite, and high sulfur coal (more than 2%). Burning inferior coal is the contribution of thermal power plants to society.
Quality requirements of coal for power generation:
Pulverized coal boilers in power plants have a wide range of applications to coal, and can be designed to burn high volatile lignite or low volatile anthracite. But for an installed boiler, it is impossible to burn all kinds of volatile coal because of the limitation of burner type and furnace structure. The quality indicators of coal for power generation are:
(1) Volatile substances. It is the primary index to identify the ignition characteristics of coal. The higher the volatile content, the easier it is to catch fire. According to the boiler design requirements, the value of volatile matter in coal feed should not change too much, otherwise it will affect the normal operation of the boiler. For example, the original design changed from burning low volatile coal to burning high volatile coal, which may cause the burner to stop because the flame center is close to the burner outlet; If the original design is to burn high volatile coal instead of low volatile coal, it will lead to incomplete combustion and even flameout accident because of late ignition. Therefore, when supplying coal, try to supply volatile coal or similar coal according to the original design.
② Ash. Ash will reduce the flame propagation speed, delay the ignition time, make the combustion unstable and reduce the furnace temperature.
3 moisture. Moisture is one of the harmful substances in the combustion process. It absorbs a lot of heat in the combustion process, and its influence on combustion is much greater than that of ash.
4 calorific value. Heat value is an important basis for boiler design. Due to the strong adaptability of pulverized coal in power plant to coal types, as long as the calorific value of coal generally meets the design requirements of boiler.
⑤ Melting point of ash. Because the flame center temperature of pulverized coal boiler is mostly above 1500℃, at this high temperature, coal ash is mostly in a softened or fluid state.
⑥ Sulfur content of coal. Sulfur is a harmful impurity in coal. Although it has no effect on combustion itself, its content is too high, which is very serious for equipment corrosion and environmental pollution. Therefore, the sulfur content of coal used in power plants should not be too high, and the general requirement is that the maximum sulfur content should not exceed 2.5%.
Coal is a bituminous coal with low volatile matter, medium caking property and strong caking property. Bituminous coal with high coalification degree and good coking property. Also known as main coking coal.
There are two kinds of coking coal. The first is dry ash-free volatile VDAF >: 10% ~ 28%, and the adhesion index g >；; 65, maximum thickness of colloidal layer, y≤25mm. The coking performance of this part of coal is particularly good, and qualified blast furnace coke can be produced independently. The other dry ash-free volatile vdaf >: 20% ~ 28%, and the adhesion index is g >；; 50 ~ 65, coking is more serious than the former. Coking coal is a typical coking coal with medium volatile matter and good cohesiveness, and can form colloid with good thermal stability when heated. Coke with large size, few cracks, high crushing strength and good wear resistance can be obtained when coking alone. However, the generated expansion pressure makes it difficult to push coke, so it is necessary to add gas coal and lean coal to improve the operating conditions and coke quality. In coking coal blending, coking coal can play the role of coke skeleton, reduce shrinkage stress, thus improving the mechanical strength of coke, and is a high-quality coking raw material.
Launell coking coal is the title of bituminous coal with high coalification and good coking performance in China National Coal Classification Standard. The standard stipulates that coking coal consists of two parts. The first coking coal is dry and ash-free. & gt
Question 4: What are thermal coal and electric coal? What's their difference? Both electric coal and power coal are pulverized coal. Electric coal is also called bituminous coal/pulverized coal. Washing mixed coal is the coal in the coal washing plant, which washes away the earth and stone, and the quality is very poor. Raw coal is directly extracted from wells or pits and processed without screening. It is a mixture of lump coal and pulverized coal. The procedure is as follows: raw coal is divided into pulverized coal (power coal, electric coal), washed mixed coal and lump coal. There are many other messy names that vary from place to place.
Question 5: Thermal coal futures information: What does thermal coal mean? Coke futures and thermal coal futures will be listed soon. In order to prepare investors, we will sort out the investment information about thermal coal and coke futures for you. Coal is a solid combustible mineral gradually formed by ancient plants buried underground through complex biochemical and physical-chemical changes. A solid combustible organic rock, commonly known as coal, is mainly transformed from plant remains by biochemical, burial and geological processes. Coal is called black gold and industrial food. Since18th century, it has been one of the main energy sources used in the human world. Although the important position of coal has been replaced by oil now, it will inevitably decline for a long time to come. Because of the huge coal reserves, the rapid development of science and technology, the maturity and wide application of new technologies such as coal gasification, coal will surely become one of the irreplaceable energy sources in human production and life. According to the coalification degree of coal, all coals in China are divided into three categories: lignite, bituminous coal and anthracite. According to its main uses, it can be divided into power coal and coking coal. Broadly speaking, all coal used for power generation, locomotive propulsion, boiler combustion and other purposes. It belongs to power coal, referred to as power coal for short.