Coal uses the principle of energy conversion to produce electricity.
When fuel is burned, it heats water to generate steam, which converts the chemical energy of the fuel into thermal energy. The steam pressure causes the steam turbine to rotate and the thermal energy is converted into mechanical energy. The steam turbine then drives the generator to rotate, converting the mechanical energy into electrical energy.
Coal has a wide range of uses, which can be summarized into three main uses depending on its purpose: thermal coal, coking coal and coal for the chemical industry, including coal gasification, low temperature carbonization coal, and hydrogenation coal. Liquefied coal, etc.
(1) Coal for electricity generation: more than a third of Chinese coal is used for electricity generation, and consumptionAverage ion of coal for electricity generation is about 370 g/(kW·h) of standard coal. Power plants use the calorific value of coal to convert thermal energy into electrical energy.
(2) Coal consumption for steam locomotives: accounts for approximately 3% of electric coal consumption. The average coal consumption index of steam locomotive boilers is approximately 100 kg/(10,000 tonnes·km).
(3) Coal for construction materials: It accounts for more than 13% of coal energy, with cement using the largest amount of coal, followed by glass, bricks, tiles, etc.
(4) Coal used in general industrial boilers: In addition to thermal power plants and large heating boilers, there are many types of industrial boilers used in general businesses and heating, and their quantities are important and availableersed. Coal consumption accounts for approximately 26% of thermal coal.
(5) Domestic Coal: The amount of domestic coal is also large, accounting for about 23% of the coal used as fuel.
(6) Thermal coal for metallurgy: Thermal coal for metallurgy is mainly anthracite coal for sintering and injection in blast furnaces, and its consumption is less than 1% of the quantity thermal coal.
Detailed information
Although China is relatively rich in coal resources, its coking coal reserves are still relatively small, accounting for only 27 .65% of coking coal reserves. China's total coal reserves.
Coking coal includes gaseous coal (accounting for 13.75%), fatty coal (accounting for 3.553%), main coking coal (accounting for 5.26%), lean coal (accounting for 4.01%) and others unclassified. coals (representing 0.55%).
Non-coking coal includes anthracite coal (accounting for 10.93%), poor coal (accounting for 5.55%), low-caking coal (accounting for 1.74%), non-coking coal (accounting for 1.74%), coke (representing 13.8%). and long flame coal (accounting for 13.8%), lignite (accounting for 12.76%), natural coke (accounting for 0.3%), unclassified coal (accounting for 13.80%) and coal unclear mark (representing 1.06%).
The main use of coking coal is the manufacture of coke. Coke is melted from coking coal or mixed coal at high temperatures. Typically, about 1.3 tons of coking coal can be used to make one ton of coke. Coke is mainly used in steel manufacturing and is the main raw material for the steel industry and other industries. It is known as the "staple food" of the industeel streak.
Baidu Encyclopedia - Coal (word definition)
Thermal energy production requires a large amount of coal. Analyze the principles of the following practices or phenomena (1) Coal cannot. be used in hot summers. Long-term dense accumulation should be carried out regularly.
People use the thermal energy generated when coal is burned to generate electricity through electricity generation devices (including production method of electricity that converts power plant boilers, steam turbines and generators and their auxiliary devices) into electrical energy. Among all methods of generating electricity, thermal power generation is the oldest and most important.
Coal has been used as fuel for 800 years. Coal has been widely used as a fuel for productionindustrial development, since the industrial revolution at the end of the 18th century. With the invention and use of the steam engine, coal was widely used as a fuel for industrial production, bringing unprecedented productivity to society and promoting the development of industry. Thus, coal, steel, chemicals, mining and metallurgy developed. industries. Coal has a high calorific value and the calorific value of standard coal is 7000 kcal/kg. In addition, coal has abundant reserves on earth, is widely distributed, and is generally relatively easy to extract, so it is widely used as a fuel in various industrial production.
(1) In hot summer, coal cannot be densely packed for a long time and must be turned over regularly to avoid oxidation and spontaneous combustion in the air
>(2) Coal; must be crushed before entering the oven. After entering, increase the amount of air inlet appropriately to allow it to burn completely;
(3) The pulverized coal is transported to the furnace by air, so that the particles of Pulverized coal cannot be too fine to prevent them from being carried away by the air.