The hottest rotating coal-fired power generation t

Rotary coal-fired power generation technology

Abstract: rotary power generation refers to the traditional power generation method that converts the chemical energy of fuel into heat energy, and then into mechanical energy, driving the generator to produce electric energy. This new technology of efficient and clean coal-fired power generation includes circulating fluidized bed, external combustion, combined cycle, high-efficiency power generation system, etc

key words: circulating fluidized bed coal-fired power generation rotary power generation mode refers to the traditional power generation mode that converts the chemical energy of fuel into heat energy and then into mechanical energy to drive the generator to produce electric energy. This new technology of efficient and clean coal-fired power generation includes circulating fluidized bed, external combustion, combined cycle, high-efficiency power generation system, etc. 1 circulating fluidized bed circulating fluidized bed boiler is characterized by fluidized combustion of the boiler, the combustion particles rise and fall repeatedly to form an internal circulation, and the unburned small particles are collected by the cyclone separator and sent back to the furnace to form an external circulation. The two cycles increase the heat and mass transfer rate and combustion efficiency in the combustion process. The best combustion temperature (850 ℃) is achieved by controlling the air volume, common faults 4: furnace charge (coal, limestone) and ash return volume, so as to form the best desulfurization and denitrification effect. The main advantages of this bed are strong fuel adaptability, high combustion efficiency (99%), good load regulation adaptability (25% ~ 100%), and high desulfurization and denitrification efficiency. With the development of fluidized bed technology, pressurized fluidized bed appears after atmospheric fluidized bed. 4. When installing zigzag bearings on hydraulic universal testing machine, pay attention to calculate the distance between the bearings. The pressurized bed is the combustion chamber, cyclone separator, ash return system, etc. sealed in the pressure vessel (1.2 ~ 1.6Mpa). The coal and limestone are sent to the lower part of the bed, and the primary air mixes and fluidizes the furnace charge and compressed air, and controls the furnace temperature to reduce the NOx generation of the first potential customer who has received the test sample. Unburned small particles leave the combustion chamber and enter the cyclone separator. Most of them are separated and sent back to the combustion chamber to realize recirculation combustion. Pressurized fluidized bed is characterized by high thermal cycle efficiency (up to 44%), compact structure and miniaturization. The fluidized bed is suitable for power plant reconstruction and can increase efficiency by 5% and output by 20%. Now the United States, Britain and other countries have successively put forward the idea of a more advanced second-generation pressurized fluidized bed, which is a combination of the first-generation pressurized bed and integral coal gasification. The feature is to add a high-temperature coal cracking furnace in the original system, so that the gas temperature generated by the pressurized bed can be increased to 1160 ℃ for use by the gas turbine. The flue gas discharged after the gas turbine works is sent to the waste heat boiler to produce steam for the steam turbine to generate electricity, so as to improve efficiency. The outstanding advantages of the second generation pressurized fluidized bed are high efficiency, circulation efficiency of 45% - 46%, efficiency of 49% after gas turbine transformation, low coal consumption and less pollutants; However, its commercialization still needs to solve problems such as improving the operating life of the dust collector, corrosion prevention of steam turbine blades, and improving the heat resistance of bed parts. 2 in recent years, the integrated coal gasification combined cycle combines the steam turbine cycle and the gas turbine cycle to form the most effective thermal cycle, which realizes the cascade utilization of work and heat and the optimal allocation of different grade forms of energy in the process of all energy conversion, so as to obtain the thermal efficiency and energy conversion effect far greater than that of the single Rankine cycle. In the process of integrated coal gasification combined cycle power generation, the fuel coal is first decomposed and gasified in the gasifier to generate medium heat or low heat gas. After reheating, this high-temperature and high-pressure gas is used as the working medium to drive the gas turbine generator set to generate electricity. The high-temperature gas (600 ℃) after work is sent to the waste heat boiler to produce steam, and then the steam is used to drive the steam turbine generator set to generate electricity. The main advantages of this system are high thermal efficiency (general circulation efficiency can reach 42% - 45%, even 52% - 55%), less investment, fast construction, low pollution, high desulfurization rate (98% - 99%), less land occupation, water conservation, etc. 3 high efficiency power generation system

following the above two technologies, the United States recently proposed the research topic of high efficiency power generation system. The biggest feature of its technology is based on indirect coal-fired technology. Its thermal efficiency can reach 47%, which is comparable to natural power generation. The high-efficiency power generation system consists of a set of indirect coal-fired gas turbine pre cycle and a set of traditional post cycle. The high-temperature combustion chamber indirectly heats the air, and then burns the clean fuel to further raise the air temperature to the inlet temperature of the gas turbine (1160 ℃), which is used by the gas turbine. The exhaust gas after the work is sent to the waste heat boiler to produce steam and drive the steam turbine to generate electricity. The most important feature of high-efficiency power generation system is that the working medium (air) is not directly heated, which avoids the complex purification problem of general gas turbine working medium (such as gas), and correspondingly solves the thorny problem of turbine blade corrosion and wear. High efficiency power generation system is still in the research and development stage, commercial 2 The measurement must not pay attention to the average and repetitive operation, which will take about 5 years. What is LCD TV? LCD is the cutting-edge product of high-tech display and the development direction of display market in the future. The structure of the LCD TV screen is simply to clamp the liquid crystal with two special glasses, and adjust the imaging through an 8-bit driving circuit and an efficient backlight system

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