System and technology for trapping CO2 in smoke

Abstract

The invention discloses an absorbent for trapping CO2 in smoke and a trapping regeneration technology, and belongs to the technical field of smoke purification. The CO2 trapping technology includes the absorbent, a CO2 absorbing system and a regeneration system. The absorbent is an aqueous solution of N-methyldiethanolamine (MDEA) and piperazine (PZ), the concentration of the PZ is 10wt.% to 20wt.%, and the concentration of the MDEA is 30wt.% to 40wt.%. The absorbing system comprises an absorbing tower and an intermediate cooling system, and rapid and high-capacity absorption can be achieved; the distributed rich liquor feeding technology is adopted for the regeneration system, a poor-rich-liquor heat exchange unit is designed in the middle of a desorption tower, high integration of system energy is achieved, the energy consumed in the regeneration process of the absorbent is greatly reduced, and the energy efficiency of the whole process is effectively improved. The absorbent and the trapping regeneration technology are suitable for flue gas of coal-fired power plants and the like and the fields in which the requirements for decarburization efficiency are not high in the chemical industry.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a high-efficiency, low-energy absorption-desorption CO 2 capture system. Background technique [0002] High CO 2 Emissions and CO 2 Accumulation in the atmosphere is considered to be the main cause of global warming, and my country's CO 2 There is a huge and urgent need in the field of emission reduction technologies. my country is a country rich in coal and poor in oil and gas, and the proportion of coal-fired power plants in my country exceeds 50%. Moreover, coal has a higher CO2 relative to natural gas and oil 2 emission factor. Flue gas CO 2 Capture mainly includes pre-combustion capture, oxygen-enriched combustion and post-combustion capture technologies. Pre-combustion capture is mainly used in IGCC power plants. Oxygen-enriched combustion technology requires the addition of oxygen production equipment and the transformation of existing pow...

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Problems solved by technology

However, MEA has a strong alkalinity, resulting in high regeneration energy consumption during the rich liquid regeneration process.

Li Kangkang et al. (Li K. Applied Energy. 2016) pointed out that the minimum heat load of the reboiler in the MEA regeneration process is 3.11 GJ / t CO 2 , resulting in a 9.13% reduction in thermoelectric efficiency for a coal-fired thermal power plant (650 MW, net electrical efficiency 38.9%)

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