Release time：2022.12.06
Source: This website
Coal-fired power generation is the most important way of thermal power generation and the pillar industry of China's economic construction, which can meet the electricity supply demand of enterprise operation and residents' daily life to the greatest extent.
In recent years, the national and social groups' awareness of environmental protection has been continuously enhanced. Under the concept of sustainable development, environmental protection and energy saving have become an important direction for the structural adjustment of China's power industry. A large number of small thermal power units with low energy efficiency and heavy pollution have been shut down across the country. We are experiencing a transition period of upgrading domestic thermal power equipment. The environmental compliance requirements for the discharge of wastewater, exhaust gas and solid waste from coal-fired power plants have been urging enterprises to continuously improve their internal management.
Coal-fired power plants are mainly composed of combustion system (with the boiler as the core), soda water system (mainly composed of various pumps, feedwater heaters, condensers, pipes, water wall, etc.), electrical system (mainly turbine generators, main transformers, etc.), control system, etc. In the main production process of coal-fired power plants, the following transformations are realized successively:
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Chemical energy is converted into heat energy
The power plant will be coal as raw material, using belt transmission technology and pulverized coal processing technology, to transport the treated pulverized coal to the boiler, and then with the help of hot air into the boiler full combustion, so that the chemical energy stored in the fuel into heat energy.
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Thermal energy is converted into mechanical energy
After the water in the boiler absorbs heat, it becomes saturated steam under a certain pressure. The saturated steam continues to be heated into superheated steam in the superheater, enters the steam turbine along the steam pipe, expands and does work in the steam turbine, drives the steam turbine generator set to rotate, and converts the steam heat energy into the mechanical energy rotating in the rotor system of the steam turbine generator set.
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Mechanical energy is converted into electrical energy
When the generator rotor rotates, the magnetic field formed by the excitation current in the generator rotor also rotates accordingly, so that the flux of the stator coil is periodically changed, the induction potential is generated in the stator coil, and the electric energy is sent to the industrial and mining enterprises and other users along the power network.
In the whole transformation process, the key equipment involved includes coal mill, boiler, steam turbine, generator, desulfurization and denitrification link, dust collector and cooling tower of circulation cooling. There will be various process media or pollution sources in the process flow, so the selection of good seals for these equipment and Diweices has a crucial role in effectively reducing pollution emissions and improving operational efficiency.
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