Device for removing CO2 of flue gas by highly active potassium-base absorbing agent dry method and method thereof

Abstract

The invention discloses a device and a method for removing CO2 in flue gas by dry process and using a highly active potassium based absorbent. The device essentially consists of two circulating fluidized bed reactors, two sets of buried pipe type heat exchangers, two sets of materiel cycle devices and a gas generating, mixing and delivery device. After desulfurization, flue gas and steam generated by the exhausted spare heat of a steam turbine are mixed and sent into a first circulating fluidized bed reactor and react with the highly active potassium based absorbent in the reactor to remove CO2 in the flue gas; after reaction, the absorbent is sent to the other circulating fluidized bed reactor and regenerated in the reactor through the buried pipe by using the heat of hot flue gas generated in a station boiler. Mixed gas generated is dehydrated by a condenser and high purity of CO2 is obtained. Part of CO2 is taken as a fluidizing medium for a regeneration reactor and the rest is collected and disposed. The device is organically integrated with a coal power generation system and utilizes coal flue gas to provide heat needed by the device, which is a prioritization scheme with low energy consumption and investment.

Description

technical field [0001] The present invention relates to CO in flue gas produced by fossil fuel combustion 2 removal and concentration methods, especially a dry removal of CO in flue gas using high-activity potassium-based absorbents 2 devices and methods. The invention belongs to the technical field of carbon dioxide capture and emission reduction. Background technique [0002] Carbon dioxide is a typical "greenhouse effect" gas. Because of its huge amount of emissions and its increasing trend, its impact on the increase of the earth's near-surface temperature has become increasingly prominent and has become a hot issue of global concern. The use of fossil fuels such as coal, oil, and natural gas is CO 2 major sources of greenhouse gases. According to statistics, in 2006 my country's coal consumption accounted for 69.7% of the total energy consumption. From the perspective of the composition of my country's primary energy geological reserves, the price of primary energ...

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Problems solved by technology

The carbonation reaction is a highly exothermic reaction. If the heat in the carbonation reactor cannot be dissipated in time, the temperature of the carbonation reaction system will rise until it exceeds the optimum reaction temperature zone, thereby affecting the normal progress of the carbonation reaction.

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