Combined cycle generation system of high-pressure oxygen-enriched combustion fluidized bed

Abstract

The invention relates to a combined cycle generation system of a high-pressure oxygen-enriched combustion fluidized bed, which is used for solving the problem of economy of oxygen-enriched combustion. The invention has the technical scheme that the combined cycle generation system of the high-pressure oxygen-enriched combustion fluidized bed comprises a working medium circulating system, an oxygen gas supply and flue gas recirculation system and a fuel conveying device, wherein the overall process of the whole system from the oxygen preparation of air separation, the combustion and the heat exchange of a boiler, the work applying of a high-pressure gas turbine until the CO2 trapping of flue gas is persistently finished at high pressure, and the compression energy consumption and the decompression loss are greatly reduced. The invention can condense water in the flue gas which is unserviceable originally in combustion at normal pressure into liquid water, thereby utilizing the released latent heat of vaporization, which lowers the flue gas loss to about 1%, enhances the efficiency of the boiler greatly and can also enhance the output of the gas turbine by about 3-5%. Because of high pressure in an exhaust-heat boiler, liquid-state CO2 can be obtained only by cooling the flue gas to about 25 DEG C through cooling water. Compared with a normal-pressure oxygen-enriched combustion mode adopting multistage compression and refrigeration, the energy saving of the invention is larger.

Description

technical field [0001] The invention relates to a coal-fired power generation technology, in particular to a high-pressure fluidized bed combined cycle power generation system, which belongs to the technical field of boiler combustion power generation. Background technique [0002] As we all know, CO 2 The resulting greenhouse effect has seriously affected the global environment, and has brought a great negative impact on the survival of some coastal countries. In response to this problem, countries are actively developing technically feasible, economically affordable CO 2 emission reduction methods. The oxygen-enriched combustion technology introduced in the 1980s (O 2 / CO 2 Combustion technology, also known as O 2 / CO 2 Flue gas recirculation coal combustion technology), CO in the flue gas produced by combustion 2 The concentration is very high (above 80%), N 2 The content is very small, which is convenient for compression and cooling to obtain liquid CO 2 , and s...

AI Technical Summary

Problems solved by technology

[0003] The pressurized fluidized bed combined cycle power generation technology, because of its unique characteristics of high energy utilization efficiency, has now appeared in commercial demonstration power plants since the laboratory-scale research began in the late 1960s. Among them, the British CRE proposed The ToppingCycle is the technical representative. However, the current pressurized fluidized bed combined cycle power generation technology uses air for combustion, which is not efficient and does not consider CO 2 emission reduction

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