: The main production process of thermal power plants (taking coal-fired power plants as an example) is: the raw coal stored in the coal storage farm (or coal storage tank) is sent from coal storage yard to raw coal hopper from boiler by coal transport equipment, then sent to coal crusher by coal feeder to be crushed into pulverized coal. The pulverized coal is sent to the separator for separation, and the qualified pulverized coal is sent to the pulverized coal bin for storage (storage boiler). The pulverized coal in the pulverized coal bunker is sent to the burner of the boiler body from the pulverizer and is pulverized from the burner into the furnace for combustion (direct blown boilers separate the pulverized coal and send it directly to the furnace) . Burning pulverized coal releases a large amount of energythermal power to heat water in water-cooled wall tubes around the furnace and form a steam-water mixture. The mixture is separated by the steam-water separator in the boiler drum. The separated water is sent to the water-cooled wall tube through the downspout for additional heating. The separated steam is sent to the superheater and heated into superheated steam which meets the. specified temperature and pressure. Through the pipe sent to the steam turbine for work. The superheated steam works in the steam turbine to push the steam turbine to rotate. The steam turbine drives the generator to produce electricity. The three-phase alternating current generated by the generator passes through the wire at the end of the generator and is discharged. to the electrical network via the transformer. The superheated steam which has finished its work in the steam turbine is cooled by the condenser into condensed water. WaterCondensed is sent to the low pressure heater to be heated via the condensing pump, then sent to the deaerator for deoxygenation, and then sent. to the high pressure heater for heating via the feed water pump, sent to the boiler to continue the thermal cycle. The reheating unit adopts intermediate reheating process, that is, the steam after the high pressure cylinder of the steam turbine has done its work is sent to the boiler heater to be reheated, so that the steam temperature is raised to a certain (or initial steam) and then sent to the medium pressure steam turbine. The cylinder continues to operate.
How many parts does a thermal power plant consist of?
Classification standards for large power plants are generally defined based on the total installed capacity or the capacity of 'a single unit.
In a mannerGenerally, power plants with a total installed capacity between 600 MW and 1,000 MW are called large power plants, while those with a unit capacity above 125 MW are generally called large and medium-sized thermal power plants, power plants with a total installed capacity of less than 100 MW are called small power plants.
In addition to the total installed capacity, factors that may also be considered in power plant classification criteria include power generation technology, energy sources, geographic location and operating conditions.
Category: Science and engineering
Analysis:
Thermal power plant, called thermal power plant, uses coal and oil. , natural gas or other Plant that produces electrical energy from the chemical energy of a fuel. THEs main components of a thermal power plant are:
(1) Boiler and auxiliary equipment to ensure that the chemical energy of the fuel is converted into thermal energy.
(2) The steam turbine and auxiliary equipment ensure that thermal energy is converted into mechanical energy.
(3) Generators and exciters ensure that mechanical energy is converted into electrical energy.
(4) The main transformer transforms electrical energy into high voltage electricity and transmits it to the transmission line. According to their capacity size, power plants can be divided into large thermal power plants, medium-sized thermal power plants and small thermal power plants. However, the terms large, medium and small mentioned here are relative terms. For example, in the 1970s they were considered large thermal power plants, while inBy the 1990s, they were considered medium-sized or even small power plants.
Depending on the initial parameters of the working fluid, power plants can be divided into several types of thermal power plants: low pressure, medium pressure, high pressure, ultra high pressure, pressure subcritical and supercritical pressure; Different fuels can be divided into several types of thermal power plants such as coal, oil and gas power plants according to the different engines, they can be divided into steam turbine power plants; , gas turbine power plants, steam turbine-gas turbine power plants, etc. depending on the construction and construction of the main power plant. The structural characteristics can be divided into closed thermal power plants, semi-open thermal power plants and open-air thermal power plants. power plants;according to their different functions, they can be divided into condensing power plants and thermal power plants. The first is equipped with a condensing unit and the second is equipped with a heating unit (also called a heating unit).
Although there are many types of thermal power plants, from the point of view of energy conversion, their basic processes are the same, namely: chemical energy fuel → thermal energy → mechanical energy → electrical energy.