High and medium pressure regeneration system for flue gas decarbonization

Abstract

The invention discloses a high and medium pressure regeneration system, which comprises a medium pressure regeneration tower and a high pressure liquid pump which are connected with an absorption device, a lean-rich liquid heat exchanger connected with the high pressure liquid pump, a high pressure regeneration tower and a medium pressure regeneration tower which are connected with the lean-rich liquid heat exchanger, a carbon dioxide supercharger connected with the medium pressure regeneration tower, a carbon dioxide cooler which is merged and communicated with the top of the high pressure regeneration tower and the carbon dioxide outlet of the carbon dioxide supercharger, and a carbon dioxide compressor communicated with the carbon dioxide cooler. The system can be used for boilers in coal-fired power plants and the field of chemical engineering, and has a characteristic of regenerating carbon dioxide under high and medium pressure; the regenerated carbon dioxide only requires low compression work and can be compressed to have the pressure suitable for storage, while the energy consumed by the high pressure pump for improving liquid pressure is much less than compressed air; meanwhile, the medium pressure regeneration tower is added behind the high pressure regeneration tower, the regeneration degree of a solution is further improved and the desorption of the carbon dioxide is promoted.

Description

technical field [0001] The invention relates to the technical field of flue gas carbon dioxide capture, in particular to a high- and medium-pressure regeneration system for flue gas decarbonization. Background technique [0002] In recent years, the pressure of global warming on governments and energy companies has increased rapidly, and many western countries have begun to promote substantial decarbonization work. With my country's carbon emissions surpassing that of the United States and the calls for international emission reductions to be strengthened, carbon dioxide capture and storage technology in power plants is likely to become a technology that my country needs in the short and medium term. More than 70% of the existing power stations in our country are traditional thermal power generation. Therefore, it is the most urgent need to develop an alcohol amine absorption carbon capture technology suitable for traditional power plants. [0003] The technology of carbon...

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Problems solved by technology

At the same time, due to the regeneration under normal pressure, a large amount of water vapor will be generated simultaneously with the desorption of carbon dioxide gas. The volume ratio of water vapor accounts for more than 50% of the entire regeneration gas, and its latent heat consumes a large amount of steam, resulting in system energy consumption. Large, and this part of water vapor is then condensed through the condenser and sent back to the system, resulting in energy loss

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