Describe the production process of a thermal power plant?

Power generation: Four new power generation technologies IGCC technology: mature clean and efficient coal power technology IGCC (Integrated Gasification Combined Cycle), that is, the integrated gasification combined cycle power generation system, is an advanced power system combining coal gasification technology and efficient combined cycle. It consists of gasification and purification of coal and gas-steam combined cycle power generation. The main equipment of the first part is gasifier, air separation device, gas purification equipment (including sulfur recovery device); The main equipment in the second part includes gas turbine power generation system, waste heat boiler and steam turbine power generation system. Compared with traditional coal power technology, IGCC integrates coal gasification and gas-steam combined cycle power generation technology with the advantages of high power generation efficiency, low pollutant emission, low carbon dioxide capture cost, and is currently verified internationally, capable of industrialization, and the most promising clean and efficient coal power technology. Supercritical and ultra-supercritical units: with high energy saving and environmental protection performance, supercritical units and ultra-supercritical units in thermal power plants refer to the pressure of the working medium in the boiler. The working medium in the boiler is water, the critical pressure of water is 22.115MPa, the critical temperature is 374.15°C; At this pressure and temperature, the density of water and steam is the same, it is called the critical point of water, the working medium pressure in the furnace is lower than this pressure is called subcritical boiler, greater than this pressure is supercritical boiler, the steam temperature in the furnace is not less than 593°C or steam pressure is not less than 31MPa is called ultra-supercritical. In engineering, it is often called ultra-supercritical above 25MPa. Large air cooled power generation technology: widely used in water shortage areas air cooled generator set is the use of forced flow of air as a heat source carrier, to achieve the purpose of equipment heat dissipation. At present, there are three kinds of air cooling systems used in power plants, namely direct air cooling, external condenser indirect air cooling system and hybrid condenser indirect air cooling system. The direct air cooling mainly adopts mechanical ventilation. Under the same conditions of water resources, the use of air cooling units can expand the installed capacity several times, air cooling units have been widely used in the new thermal power units in water shortage areas, to save water resources in the new thermal power units in water shortage areas, to meet the development of power industry. CFB power station: Improve the efficiency of coal use Circulating fluidized bed (CFB) is to suspend a large number of solid particles in the moving fluid, so that the particles have some apparent characteristics of the fluid, this fluid-solid contact state is called solid fluidization. The circulating fluidized bed boiler has excellent low load operation capacity and is suitable for power grid load peak regulation. Construction of large CFB power stations, combustible coal gangue, coal, peat, inferior coal, improve the comprehensive use of coal efficiency, while reducing waste coal gangue, inferior coal and other land occupation, reduce environmental pollution.

Energy storage frequency modulation: with broad development prospects Traditional firepower unit power adjustment to chemical energy, heat, kinetic energy, electric energy through a series of conversion, adjustment process is long, slow response, difficult to respond to the frequency modulation needs of up to 100 times a day. The frequency modulation of the unit is assisted by energy storage technology such as lithium battery, which can reduce the response time from the minute level to the second level, greatly improve the frequency modulation performance index K value, stabilize the unit output, and reduce the unit loss and energy consumption. According to the calculation of international institutions, the replacement effect of energy storage frequency modulation on thermal power units can reach 25 times. In addition, thermal power additional energy storage can reduce coal consumption and unit wear in thermal power plants. The good effect of energy storage participation in frequency modulation has made it large-scale application in the world's major power markets. The development of thermal power energy storage frequency modulation has played a positive demonstration role for new energy energy storage. With the increase of the penetration rate of new energy, the way of energy storage participation in new energy frequency modulation is expected to become an important means of power frequency modulation and has broad development prospects.

Flue gas treatment technology: flue gas desulfurization

In the flue gas desulfurization technology route, according to the different reactants and the material form of the product, it can be divided into wet method, semi-dry method and dry method. The application of limestone-gypsum wet method is the most popular, and the technical advantages are wide sources of absorbent, strong adaptability of coal, low price and recyclable by-products.