A pressurized fluidized bed boiler s-co 2 Cycle power generation system and method

Abstract

The invention discloses an efficient heat exchange pressurized fluidized bed boiler S-CO2 cycle power generating system and method, and belongs to the field of efficient power generating equipment. The system is composed of a pressurized boiler system, a waste heat recovery system and a single reheat re-compression cycle system. The three systems jointly act to efficiently convert heat generated through coal burning into work. The pressurized boiler system, a hearth of a tail flue system and the interior of a tail flue can achieve a 1-2 MPa high-pressure state. Meanwhile, in order to guaranteethat heat of flue gas in the tail flue is fully absorbed by a CO2 working medium in an overheater and a reheater, compact heat exchangers are adopted for the overheater and the reheater. The waste heat recovery system is characterized in that the flue gas applies work in a flue gas turbine, and the temperature of the flue gas on an outlet of the flue gas turbine can be about 120 DEG C. By means of the power generating system, the boiler size problem generated when S-CO2 cycle is applied to the field of coal-fired power generation is solved, and the advantages of being efficient, simple and small of the S-CO2 cycle are exerted while the boiler size is reduced.

Description

technical field [0001] The invention belongs to the field of high-efficiency power generation equipment, in particular to a high-efficiency heat exchange pressurized fluidized bed boiler S-CO 2 Cycle power generation system and method. [0002] technical background [0003] Supercritical carbon dioxide Brayton cycle (S-CO 2 In recent years, extensive research has been carried out in the fields of sodium-cooled fast reactor power generation, tower-type solar thermal power generation, and waste heat utilization of gas turbine flue gas. This study was carried out under the conditions of relatively mature technology related to the steam Rankine cycle because compared with the steam Rankine cycle S-CO 2 Loops can offer some very attractive advantages. [0004] For example, at the same turbine inlet temperature, S-CO 2 Compared with the steam Rankine cycle, the cycle can have higher efficiency in the medium isothermal region (550°C-700°C). In addition CO 2 It is chemically in...

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Problems solved by technology

The increase of mass flow will increase the pressure drop of the internal parts of the boiler, which will affect the thermal efficiency of the unit

If the tube bundle is increased to reduce the mass flow rate of the working medium, the size of the boiler will be increased. On the one hand, the increase in the size of the boiler is difficult to ensure the stable combustion of the boiler, and on the other hand, the cost of the boiler will increase.

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