Does anyone know the main system process of the boiler steam engine electrical of the thermal power

The main processes of coal-fired thermal power plants are as follows:

Boiler (pulverized coal): After burning coal to make pulverized coal, it enters the furnace from all around the furnace body under the carrying of preheated air. After the softened water in the heating surface of the furnace body is vaporized, it is separated by the gas drum and then heated into dry steam by the reheater and superheater at the top of the furnace;

Steam turbine: After the dry steam enters the steam turbine, it flows out through the nozzle of the high-pressure cylinder, medium-pressure cylinder and low-pressure cylinder to drive the rotation of the steam turbine blades;

Generator: The rotor of the steam turbine drives the rotor of the generator to rotate and cut the magnetic field lines to generate electricity.

Let's start with the deaerator.

The water of the deaerator is condensate and the demineralized water is added through the feed pump, and then enters the boiler economizer after heating and enters the boiler steam drum. This goes into the boiler, where a series of heating is carried out to produce high-temperature and high-pressure steam (main steam). The main steam enters the steam turbine from the main steam pipe, works in the steam turbine and then enters the condensate (n) or is discharged to the pressure pipe (b).

The condensing unit is condensed into condensate through the condenser, and then enters the low addition through the condensate pump, and the low addition enters the deaerator for a cycle. There is also a Ningsheng pump after the condensate pump of the large unit. Back pressure machine, that is, the exhaust gas enters the heater or heat user, and then condenses into water, which is pumped back to the deaerator.

The cycle is all over.

Since I have not been in the steam engine post for a long time, I don't know much about the boiler, and there are fewer furnace side letters, I hope it will help you.

Boiler professional operators need to inspect the equipment in the boiler body, and there are many high-altitude operations. The dust pollution of the working environment of maintenance personnel is relatively serious, and they often need to work in high-temperature areas.

Professional operators of steam turbines need to inspect the steam engine room and steam and water system equipment, and the main work is the valve operation of various pipelines and pumps. Maintenance personnel are mainly responsible for the replacement of pipeline valves and the repair of pumps. The working environment is humid.

Electrical operators need to inspect the work conditions of power distribution devices and transformers, and operate switches according to the command of the chief. The main work of maintenance personnel is motor maintenance and power distribution device maintenance, which is generally indoor work, which is a little better than the working environment.

Since your major is not right, from the perspective of personal progress, you can choose the steam engine major, if you want to learn more things, it is convenient to change jobs in the future, it is recommended to choose electrical.

The boiler profession is dirty and tiring. The steam engine major is similar to the boiler. The electrical profession is an easy but dangerous job, and electrical operation requires a certain amount of professional knowledge, and if you don't have the right counterpart, you can't get started for 10 years.

The steam engine and electrical can work in a better environment.

Brother, what's wrong, is it still in the power plant? Ask a question.

The boiler is to transfer the heat released by the combustion of coal (pulverized coal) to the feed water of the boiler through conduction, convection, and radiation, and generate steam (high temperature and high pressure or ultra-high pressure, subcritical, critical) after heating, and the steam is sent to the steam turbine through the steam pipe that can withstand high pressure, and the expansion does work, and the steam turbine is driven to rotate (3000rpm or 3600rpm), the steam turbine drives the generator rotor to rotate, and the rotating magnetic field is generated under the action of the excitation current, and the generator stator coil cuts the magnetic field lines, according to Faraday's principle, Induction produces alternating current.

To burn pulverized coal, the boiler needs a coal mill, an igniter, a blower, a suction fan, and a powder exhaust fan, a primary fan, a fire pick-up fan, and a burner. There are large heating pipes, steam drums, joint boxes, as well as air preheaters, soot blowers, electrostatic precipitators, feed pumps, slag removal machines, ash pumps and other equipment.

Steam turbines mainly include high-pressure cylinders, medium-pressure cylinders, low-pressure cylinders, deaerators, condensers, low-pressure heaters, high-pressure heaters, vacuum pumps, shaft seal systems, cooling water systems, lubricating oils, top shaft oil systems, hydrogen systems, and chemical water treatment systems.

Electrical includes generators, exciters, switchboards, switching stations, busbars, transformers, medium-voltage plant buses and low-voltage plant buses, as well as DC power supplies and uninterruptible power supplies for control.

It is necessary to study heat transfer, engineering thermodynamics, fluid mechanics, water chemistry, thermal automation, electrical fundamentals, circuit analysis, electrical principles, mechanical drawing, general physics, college English, professional English, advanced mathematics, etc.

Do you need an agreement between master and apprentice? Are there any stakes? Some of the raw points are ......

The following is the approximate water vapor circulation process of the drum furnace condensing steam turbine:

Feed water pump--- heater--- economizer--- boiler inlet water --- water wall heating (to saturated steam) - steam drum (steam-water separation) - superheater heating (to superheated steam) - main valve ---speed control valve--- steam turbine to do work--- condenser (** condensate) - condensate pump--- deaerator water tank --- feed pump.

If the unit is larger, it needs to be heated with a low-temperature heater before entering the deaerator (the steam source is the medium pressure or low pressure cylinder of the steam turbine to pump steam, and the heated drain is sent to the deaerator or condenser) and then enters the deaerator, and the water coming out of the deaerator is pressurized by the feed pump, and then enters the economizer after being heated by the high-temperature heater (the steam source is the steam turbine high-pressure cylinder pumping steam, and the water is sent to the deaerator). The economizer heats the feed water to a certain level and sends it to the boiler drum. The steam drum sends the water into the water wall through the descending pipe to heat it into a steam-water mixture, and then sends the water back to the steam drum, there is a steam-water separator in the steam drum, and the wet saturated steam enters the superheater after coming out of the steam drum and heats it into dry saturated steam, and the dry saturated steam is high-temperature and high-pressure steam, which enters the steam turbine to do work. The condensing unit sends the exhaust steam into the condenser to condense into water and send it to the deaerator for recycling, while the pressed unit discharges the exhaust steam for industrial steam or heating steam, and does not do recycling.

Electrical, steam engine, the key is what is your own specialty? And which is closer? The steam engine is close to the machine specialty.

Mainly put some steam turbines, generators, condensers, as well as various pumps, water pumps, air pumps, etc.

Thermal power plant is referred to as thermal power plant, is the use of coal, oil, natural gas as fuel to produce electric energy plant, its basic production process is: fuel in the boiler burning heating water to generate steam, the chemical energy of the fuel into heat energy, steam pressure to drive the steam turbine rotation, heat energy into mechanical energy, and then the steam turbine to drive the generator to rotate, the mechanical energy into electrical energy.

The main facilities are steam turbines, generators, condensers, as well as various pumps, water pumps, air pumps...

It is divided into steam turbine operating layer platform, including steam turbine, generator and small steam turbine. Zero-meter equipment platform, there are many small equipment such as feed pumps, electric pumps, etc. The middle level platform is equipped with equipment rooms for piping and electrical thermal control.

Refers to boilers, steam turbines, generators.

Thermal power plant special:

Thermal power plant is referred to as thermal power plant, is the use of coal, oil, natural gas as fuel production of electric energy plant, its basic production process is: fuel in the boiler burning heating water into steam, the chemical energy of the fuel into heat, steam pressure to drive the steam turbine rotation, heat energy into mechanical energy, and then the steam turbine to drive the generator to rotate, the mechanical energy into electrical energy.

Composition: A modern thermal power plant is a large and complex plant for the production of electricity and heat. It consists of the following 5 systems: Fuel system.

Combustion system. Soda system. electrical system.

Control system. In the above system, the main equipment is boilers, steam turbines and generators, which are installed in the main building of the power plant. The main transformer and power distribution device are generally installed in an independent building or outdoors, and other auxiliary equipment such as water supply system, water supply equipment, water treatment equipment, dust removal equipment, fuel storage and transportation equipment, etc., some are installed in the main plant, and some are installed in auxiliary buildings or in open spaces.

The basic production process of thermal power plants is that the fuel is burned in the boiler, and its heat is released and transferred to the water in the boiler, so as to produce high-temperature and high-pressure steam; The steam passes through a steam turbine and converts heat energy into rotational power to drive a generator to output electrical energy. By the 80s, the world's best thermal power plants were 40% efficient, converting 40% of the thermal energy in the fuel into electricity.

Boiler units, steam turbine units, generator sets.

They are boiler units, steam turbine units, and generator sets.

Boilers, steam turbines, generators.

The role of equipment and the process of each system of thermal power plant.

The thermal power system of thermal power plant mainly includes steam intermediate reheat system, feed water recovery system, external heating system, waste heat utilization system, evaporator system, bypass system and water drainage system.

1.Steam intermediate reheat system.

A system that draws steam from the intermediate stage of the turbine, reheats it in the boiler reheater, and then sends it back to the next stage of the turbine to continue working. Its purpose is to increase the initial pressure, so that the humidity of the steam at the tail of the steam turbine will not be too large, and ensure the long-term safe operation of the steam turbine. Depending on the degree of pressure increase, a primary or secondary intermediate reheat system can be installed.

In order to improve the thermal economy of modern thermal power plants, the boiler steam turbine units are mostly at ultra-high pressure (13 megapascals) or above, so the steam intermediate reheat system is mostly used.

2.Feed water recuperation system.

A system in which part of the steam is extracted from the intermediate stage of the turbine at different pressures and used to heat the condensate and feedwater. There is no loss of cold source in the work of extraction for this part of the heat recovery, which is one of the main measures to improve the thermal economy of thermal power plants. Modern thermal power plants usually use 7 or 8 (or even 9) recuperation heating systems.

3.External heating system.

The steam used by the steam used by the steam turbine to supply heat to the outside world is mostly used in thermal power plants.

4.Waste heat utilization system.

**A system for exhausting steam and discharging heat in a power plant. The aim is to reduce working fluid and heat loss. It mainly includes the shaft seal cooler of the steam turbine, the continuous blowdown expansion device and the blowdown water cooler of the natural circulation drum furnace.

5.Evaporator system.

A system that uses an evaporator to produce make-up water for a power plant's boiler. High-pressure drum boilers and through-flow boilers require highly pure make-up water, which has traditionally been distilled from evaporators. That is, the intermediate steam extraction of the steam turbine is used to heat the softened water and evaporate it, and the generated secondary steam is cooled and condensed into water in the heat recovery system as make-up water.

Because this system increases the complexity of the thermal system and the investment in equipment, it reduces the thermal economy, and is now gradually being replaced by chemical water treatment technology.

6.Bypass system.

A system that allows all or part of the steam produced by the boiler to bypass the steam turbine or superheater and be discharged directly into the condenser or atmosphere after deheating and depressurization. Its function is to coordinate the imbalance between boiler steam production and steam consumption when the unit starts and stops and accidents, protects the steam turbine and reheater, and improves the starting and load characteristics of the unit. Bypass systems are typically of the type of overheater bypass, steam turbine bypass, and tri-valve bypass.

7.Hydrophobic system.

A system for removing condensate from steam equipment and pipelines and overflow water from water containers. It can ensure the normal working condition of each equipment and reduce the loss of working fluid in the thermal system. There are two types: start-type hydrophobic and frequent hydrophobic.