(/), coal-fired power generation belongs to thermal power generation. The first thermal energy production was carried out in the Paris Gare du Nord thermal power station in 1875. China is rich in coal resources and thermal energy production still has enormous potential. So, what is the principle of coal-fired electricity production?
Thermal energy (thermoelectric power generation) refers to the use of thermal energy generated when solid, liquid and gaseous fuels such as coal, oil and natural gas are burned to heat the water through thermal energy, causing the water to become high temperature. High pressure water vapor, then the water vapor drives the generator to produce electricity. Chemical energy of fuel → Thermal energy of steam → Mechanical energy → Electrical energy is simplythe use of fuel (coal) to generate heat, heat water and form superheated steam at high temperature and high pressure. The gas turbine is pushed to rotate, which causes the generator rotor to rotate (electromagnetic field). The stator coil cuts the magnetic lines of force and emits electrical energy. a step-up transformer is then used to increase the system voltage and is connected to the grid to transmit electrical energy outwards.
The heat released by the combustion of coal in the boiler heats the water into steam with a certain pressure and temperature. Then the steam enters the steam turbine along the pipe and continuously expands to do the work. steam turbine rotor and rotates at high speed. The steam turbine drives the generator to produce electricity. The steam which has finished its work in the turbine is discharged into the rchiller and condenses into water, which is then sent to the deaerator by the condensate pump. The water is heated by the turbine extraction steam coming from the extraction pipe into the deaerator and the contained gas is finally amplified by the feed water pump and returned to the boiler to repeat the cycle process. -above. by the generator is amplified by the transformer then entered through the network. There are three types of energy conversion processes in thermal power generation: the chemical energy of coal is converted into thermal energy in the boiler; thermal energy is converted into mechanical energy in the steam turbine; the generator. The main power conversion equipment - boilers, steam turbines and generators - are called the three main hosts of thermal power plants, and the boiler is the most basic power conversion equipment among the three main hosts. .
Due to the shortage of fossil fuels on earth, humans are trying their best to develop nuclear power generation, nuclear fusion power generation and high-efficiency solar power generation, so as to to ultimately resolve energy problems. facing human society. Thermal power generation is divided into those that simply provide electricity and those that generate both electricity and heat depending on their functions. According to the main engine, it is divided into steam turbine power generation, gas turbine power generation and diesel engine power generation. Depending on the fuel used, there are mainly coal, oil and gas power plants. In order to improve overall economic benefits, thermal power generation should be carried out as close to the fuel base as possible. In the bigs cities and industrial areas, combined heat and power production should be implemented.
The relationship between water and coal is inseparable.
The reasons are: First, coal is stored underground, and coal mining will inevitably have some impact on groundwater. Secondly, the coal mining process is also accompanied by mine drainage, and the use of mine water is a side effect of the coal mining process. Third, the different links in the coal mining chainSaving water will have an impact on water resources and the aquatic environment. The coal mining process directly destroys the structure of the groundwater aquifer, changes the recharge, runoff and discharge patterns of the groundwater aquifer, and at the same time affects the water circulation conditions from the aquifgroundwater era; overlying rock formations in the goaf and surrounding areas Collapse zones, fracture zones and flexure zones form, causing land subsidence and soil desertification, changing regional underlying surface conditions, affecting surface water infiltration, runoff production processes and exchange conditions between surface water and groundwater. , thus affecting the region. Water circulation conditions have a significant impact. In addition, land subsidence, groundwater funneling, and water pollution caused by uninterrupted and large-scale coal mining have caused serious damage to regional water resources.