A composite working fluid thermal power generation system and working method
A technology of working medium and power cycle, which is applied in the direction of machines/engines, steam engine devices, mechanical equipment, etc., can solve the problems of thermodynamic physical property limitations of metal materials, irreversible losses, etc., to improve comprehensive power generation efficiency, reduce irreversible losses, and improve operation The effect of safety and reliability
Active Publication Date: 2018-04-17
XI AN JIAOTONG UNIV
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Problems solved by technology
At present, thermal power plants use steam power cycle, and the method of reducing energy consumption of thermal power plants mainly adopts the method of increasing the parameters of water steam cycle, but this method is limited by the properties of metal materials and the thermodynamic properties of working fluid (water)
In large-capacity power plant boilers, the existing materials in the medium-temperature flue gas section (flue gas temperature is lower than 900°C) fully meet the design requirements, but the temperature difference between the flue gas and the working fluid is above 100°C, even reaching nearly 300°C, resulting in massive irreversible loss
Therefore, in the medium-temperature flue gas section, the existing thermal power generation system design has great energy-saving potential
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[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0013] The working principle of the present invention is described below:
[0014] Irreversible losses in thermal power plants mainly occur in boilers, using Analytical methods are described, i.e. boiler Dissipation mainly occurs in the combustion process and heat transfer process. where the combustion process Dissipation is unavoidable and an inevitable irreversible loss in thermal power plants, which can be reduced by increasing air preheating and other methods.
[0015] overheating The loss can be reduced by increasing the parameters of the main steam, which is mainly limited by the material. With the existing material conditions, the temperature of the main steam is difficult to break through 620°C.
[0016] At present, the heating surface of the boiler is generally arranged in order according to the direction of flue gas temperature drop, the wa...
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The invention discloses a composite working fluid thermal power generation system and its working method. The power generation system uses two working fluids, water and carbon dioxide, and the power generation cycle adopts two cycles: water steam power cycle and supercritical carbon dioxide power cycle; The steam power cycle heating surface is arranged in the high-temperature flue gas area with a gas temperature higher than 900°C, and the steam power cycle heating surface and the supercritical carbon dioxide power cycle heating surface are arranged in a medium-temperature flue gas area with a flue gas temperature between 300°C and 900°C. The heat of the cold-end heat exchanger of the supercritical carbon dioxide power cycle is used to heat the steam power cycle working medium and the boiler air supply, and the boiler air supply air preheater and the water vapor power cycle working medium heater are arranged in the low-temperature flue gas area; the present invention It can greatly reduce the irreversible loss in the middle-temperature flue gas section of the boiler, and improve the comprehensive power generation efficiency.
Description
technical field [0001] The invention relates to the technical field of reducing energy consumption of thermal power generation, in particular to a composite working medium thermal power generation system and a working method. Background technique [0002] Thermal power generation is the main body of my country's electricity production, how to reduce the energy consumption of thermal power plants is an urgent need for energy conservation and emission reduction in my country. At present, thermal power plants use steam power cycles, and the method of reducing energy consumption in thermal power plants mainly adopts the method of increasing the parameters of the steam cycle, but this method is limited by the properties of metal materials and the thermodynamic properties of working fluid (water). In large-capacity power plant boilers, the existing materials in the medium-temperature flue gas section (flue gas temperature is lower than 900°C) fully meet the design requirements, bu...
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IPC IPC(8): F01K25/00
CPCF01K25/00
Inventor 刘明严俊杰李根王进仕种道彤刘继平
Owner XI AN JIAOTONG UNIV