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Supercritical carbon dioxide coal-fired circulating fluidized bed boiler, power generation system and power generation method

A circulating fluidized bed, carbon dioxide technology, applied in the combustion method, fluidized bed combustion equipment, fuel burning in the molten state, etc., can solve the problem of low system flexibility, limited high temperature strength, high temperature oxidation corrosion resistance, and investment cost. Improve heat transfer and control wall temperature, ensure safe and reliable operation, and improve power generation efficiency

Active Publication Date: 2018-06-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The supercritical carbon dioxide cycle applied in the field of fossil fuels is mostly aimed at pulverized coal boilers, and a few are aimed at circulating fluidized bed boilers, but the temperature of the cooling wall inlet working fluid of these boilers is very high. ℃ / 28Mpa, the designed cooling wall inlet working fluid temperature is 510℃~530℃; at the same time, the proposed main compressor outlet or low-temperature regenerator high-pressure side outlet of the lower temperature working fluid diverts into the economizer, ensuring In the case of hot air temperature, it will cause a large irreversible loss of the economizer, and the inlet pressure of the compressor is closely related to the exhaust pressure of the turbine, and the system flexibility is low
[0006] The improvement of the efficiency of existing thermal power units mainly depends on the improvement of steam parameters. Steam parameters are limited by the high-temperature strength of materials, high-temperature oxidation and corrosion resistance, and welding and processing technology. 700°C high-strength materials need further research and development, and 700°C supercritical units The final boiler superheater, final reheater, main pipeline, steam turbine high-temperature section and other components need to use expensive nickel-based alloy materials, resulting in increased investment costs and reduced overall economic efficiency. The unit is large in size and low-load operating efficiency Low, unable to meet peak shaving requirements

Method used

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  • Supercritical carbon dioxide coal-fired circulating fluidized bed boiler, power generation system and power generation method
  • Supercritical carbon dioxide coal-fired circulating fluidized bed boiler, power generation system and power generation method

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Embodiment 1

[0032] Circulating fluidized bed boiler high-temperature superheater 7 outlet 28Mpa, 600 ℃ high-temperature, high-pressure supercritical carbon dioxide working fluid enters high-pressure turbine 17 and expands to do work to 12.3Mpa, 493 ℃, then enters low-temperature reheater 6, high-temperature reheater 4 Reheat to 620°C, then enter the low-pressure turbine 19 to expand and do work to 5.35Mpa, at 515°C, the exhaust gas from the outlet of the low-pressure turbine 19 enters the low-pressure side of the high-temperature regenerator 21, the low-pressure side of the medium-temperature regenerator 22, and the low-temperature regenerator 23 The low-pressure side is cooled, and then enters the pre-cooler 24 to cool to 32°C, and is compressed by the pre-compressor 25 to 7.65Mpa at 67°C. About 41.7% of the working fluid enters the re-compressor 28 and is compressed to 28.6Mpa at 188°C. Part of the working fluid enters the intercooler 26 to cool to 32°C, is compressed by the main compres...

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Abstract

The invention discloses a supercritical carbon dioxide coal-fired circulating fluidized bed boiler, a power generation system and a power generation method. The supercritical carbon dioxide coal-firedcirculating fluidized bed boiler comprises a hearth, a separator, a tail flue and an externally-arranged type heat exchanger located in a material back section of the separator. A cooling wall and anintermediate-temperature overheater are arranged in the hearth. A high-temperature reheater and a low-temperature overheater are arranged in the externally-arranged type heat exchanger, wherein the low-temperature overheater communicates with the cooling wall and the intermediate-temperature overheater. A low-temperature reheater, a high-temperature overheater, an upper-level economizer, a lower-level economizer and an air preheater are arranged in the tail flue, wherein the high-temperature overheater communicates with the intermediate-temperature overheater, the low-temperature reheater communicates with the high-temperature reheater. The working medium of the boiler is supercritical carbon dioxide. By the adoption of the supercritical carbon dioxide coal-fired circulating fluidized bedboiler, the wall temperature of the cooing wall can be effectively controlled, it is guaranteed that the boiler safely and reliably operates, and the heat efficiency is high; a power generator set tends to be miniature, a higher load response speed is obtained, the deep peak load regulation adaptability is high, the advantages of coal resources are taken into full play, the energy utilization rate is improved, and energy safety is guaranteed.

Description

technical field [0001] The invention relates to a boiler, in particular to a supercritical carbon dioxide coal-fired circulating fluidized bed boiler, a power generation system and a power generation method, belonging to the technical field of clean coal and high-efficiency power generation. Background technique [0002] At present, the primary energy structure dominated by coal determines that the long-term internal coal-fired thermal power generation will still be the mainstream direction in the future. Existing thermal power units have high energy consumption and large emissions of pollutants and greenhouse gases. Critical units are limited by material costs and manufacturing levels, and it is urgent to develop clean and efficient new coal-fired power generation technologies to ensure the sustainable development of the power industry. [0003] Supercritical carbon dioxide has high energy density near the critical point, good flow and heat transfer characteristics, the siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/08F23C10/18F01K25/10F01K13/00F01D15/10
CPCF01D15/10F01K13/00F01K25/103F23C10/08F23C10/18
Inventor 耿晨晨钟文琪邵应娟陈晓乐展锦程
Owner SOUTHEAST UNIV
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