Cement kiln flue gas carbon dioxide capture and storage system based on hydrate method

Abstract

The invention discloses a cement kiln flue gas carbon dioxide capture and storage system based on a hydrate method, which comprises a waste gas pre-treatment unit and a gas inlet pressurization refrigeration unit which are connected in sequence, and the outlet of the gas inlet pressurization refrigeration unit is connected with the inlet of a hydration reaction tank first-stage chamber for a first-stage hydration reaction; an outlet of the hydration reaction tank first-stage chamber is connected with an inlet of the hydration decomposition tank first-stage chamber for first-stage separation, the outlet of the hydration decomposition tank first-stage chamber is connected with an inlet of a hydration reaction tank second-stage chamber for a second-stage hydration reaction, and an outlet of the hydration reaction tank second-stage chamber is connected with an inlet of the hydration decomposition tank second-stage chamber for second-stage separation; an outlet of the hydration decomposition tank second-stage chamber is connected with a CO2 cooling recovery unit; and a liquid supply unit is used for respectively supplying liquid to the hydration reaction tank first-stage chamber and the hydration reaction tank second-stage chamber for hydration reaction. The continuous release of CO2 is achieved through two-stage hydration reaction and two-stage hydration decomposition, CO2 gas with the concentration as high as 99% is obtained, and the CO2 gas is stored through cooling, drying and compression.

Description

technical field [0001] The invention relates to a cement industry carbon capture system, in particular to a cement kiln flue gas carbon dioxide capture and storage system based on a hydrate method. Background technique [0002] The production of cement is a high-energy-consuming process, and energy consumption accounts for about 2% of the global primary energy consumption. Since the production process mainly uses carbon-intensive fuels, such as coal, the cement industry has become a huge source of carbon dioxide emissions. In addition to the energy consumption process, the calcination process of cement clinker also produces a large amount of carbon dioxide. [0003] Carbon capture and storage technology (CCS) is one of the core strategies of the comprehensive carbon dioxide management program. The advantage of this technology is that it can not only effectively reduce carbon emissions, but also generate economic benefits, and does not require large-scale production systems. ...

AI Technical Summary

Problems solved by technology

At present, the hydrate method has achieved certain results in the field of carbon capture, but there are still some problems, such as the inability to operate continuously in a large flow of flue gas, the slow nucleation of hydrates, and the formation of heat that cannot be dissipated in time and accumulates in droplets. wait

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