These are also water pumps, but they use “multi-stage pumps”. In the industry, this type of pump is called a “low flow, high lift” water pump. The water pump is made up of several or even dozens. sections. According to the working principle of series water pump, that is, the working pressure of series water pumps can be accumulated, so that very high pressure can be obtained.
Use fuel to generate heat and heat water to form superheated steam at high temperature and high pressure. Then the steam enters the steam turbine along the pipe and continuously expands to do the work. rotor of the steam turbine and rotates at high speed, causing the generator rotor to rotate (electromagnetic field) and the stator to rotate. The coil cuts the magnetic lines and emits electrical energy, which is then portconnected to the system voltage using a step-up transformer. , connected to the network and transmitted externally. Finally, the cooled steam is further boosted by the feed water pump and returned to the boiler to repeat the above cycle process.
Thermal power generation is a method of generating electricity that uses thermal energy generated when combustible materials are burned and converts it into electrical energy through a power generation device. China is rich in coal resources. In 1990, it produced 1.09 billion tonnes of coal, of which only 12% was used for electricity generation. Thermal energy production still has enormous potential.
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The production of electricity from thermal power plants brings many other products and produces numerous environmental impacts. Selon the principle of the Carnot cycle, there always remains a part of the waste heat which must be evacuated into the atmosphere via cooling towers or cooled by bodies of water such as natural rivers. Flue gases after burning fossil fuels will be emitted into the atmosphere. Its main components are carbon dioxide, water vapor and other components such as nitrogen, nitrogen oxides, sulfur oxides, etc. If it's a coal-fired power plant, there will be some as well. be pulverized coal, mercury, etc. The residue after coal combustion also needs to be removed from the boiler, and part can be recycled to make construction materials.
Thermal power generation from Baidu Encyclopedia