What does a power station use to generate electricity?

Answer: combustion gas system-coal: it is sent to the mill by automatic conveyor belt-hopper and meter, and then it is mixed with high-temperature steam in a certain proportion after being crushed, and then it is blown into the boiler by nozzle for combustion. The circulating pure water in the whole drainage pipe forming the lining of the furnace wall is heated and boiled to generate steam. After burning, the ash falls into the ash outlet and is discharged. The flue gas in the flue is driven to the superheater, and then heated by the steam in the heater, so that the boiler in the economizer is reheated, and the combustion gas in the warm water and air heater is used, and finally discharged into the atmosphere through the precipitation dust collector and chimney.

B. Steam system-superheated high-pressure and high-temperature steam is initially sent to the high-pressure turbine to make it rotate, and then sent to the medium-pressure turbine and the low-pressure turbine in turn after the reheater supplements the heat energy, so that the heat energy is completely exhausted and then sent to the condenser to be restored to raw water, which is circulated through the heater and economizer.

C cooling water system-the cooling water in the cooling tower (cooling tower) is supplied by the river, well, sea and tap water system, and returns to the cooling tower for cooling through the condenser.

D. Power generation system-the engine connected with the turbine rotor generates power, which is boosted by the transformer and enters the power system.

Classification for power generation:

Hydroelectric power plant is a plant that uses kinetic energy and potential energy of water flow to generate electric energy, which is referred to as hydropower plant for short. The size of water flow and the level of water head determine the size of water flow energy. From the perspective of energy conversion, this process is: water energy → mechanical energy → electric energy.

Garbage power plant

As a kind of thermal power generation, by the end of 2007, the total number of garbage incineration power plants in China has reached 75, of which 50 have been built. The 25 waste incineration power plants under construction have stable income, low operating cost and certain preferential tax policies, which can bring stable income to investors, but the environmental problems brought by waste incineration power generation can not be ignored.

nuclear power plant

A factory that use nuclear energy to produce electric energy is also called a nuclear pow plant. There is a strong binding force between nuclei (neutrons and protons). When heavy nuclear fission and light nuclear polymerization occur, huge energy will be released, which is called nuclear energy. The technology is relatively mature and has been put into operation on a large scale. From the point of view of energy conversion, it is the conversion process of nuclear energy → thermal energy → mechanical energy → electrical energy in heavy nuclear fission.

Solar power plant

Solar power plant is a kind of power plant that uses renewable energy-solar energy to generate electricity. It uses photoelectric technology to convert solar energy into electric energy. Germany uses solar energy to generate electricity for 550,000 households, and is the world champion in using solar energy to generate electricity.

Wind power plant

By the end of 2003, 40 wind farms had been built in 14 provinces (autonomous regions) with abundant wind energy resources, and 1042 wind turbines were in operation, with a total capacity of 567.02MW (subject to the completion of the hoisting of the whole machine).

Geothermal power plant

Basic principles of hydropower station power generation:

Hydroelectric power generation is to use water power (with water head) to drive hydraulic machinery (water turbine) to rotate and convert the potential energy of water into mechanical energy. If another machine (generator) is connected to the turbine, it can generate electricity with the rotation of the turbine, and then the mechanical energy is converted into electrical energy. In a sense, hydropower is a process in which the potential energy of water is converted into mechanical energy and then into electrical energy.

A comprehensive engineering facility that converts water energy into electric energy. Also known as hydroelectric power plant. It includes a series of hydropower station buildings and various hydropower station equipment built for producing electric energy by using water energy. The head is formed by collecting and adjusting the flow of natural water by using the drop of concentrated natural water flow in these buildings and transmitting it to the hydraulic turbine. Through the joint operation of hydraulic turbine and generator, the concentrated water energy is converted into electric energy, which is then input into the power grid through transformers, switching stations and transmission lines. In addition to the buildings needed for power generation, some hydropower stations often have other buildings that serve the purposes of comprehensive utilization such as flood control, irrigation, shipping, tree crossing and fish farming. The complex of these buildings is called hydropower station hub or water conservancy hub.

Related knowledge:

China has built various conventional hydropower stations, such as the Three Gorges, Gezhouba, Wujiangdu, Baishan, Longyangxia and Yili River Cascades, and built large pumped storage power stations, such as Panjiakou (see Panjiakou Water Control Project) and Jiangxia Tidal Test Power Station.