CO2 chemical absorption system and method based on water vapor mass transfer reinforced afterheat recovery

Abstract

The invention relates to a CO2 chemical absorption system based on water vapor mass transfer reinforced afterheat recovery. The system comprises CO2 absorption equipment, CO2 regeneration equipment, a rich liquor pump, a barren liquor pump, a barren liquor cooler, a three-way shunt valve, a barren liquor and rich liquor exchanger, a pressurization fan and a hollow fiber film contactor assembly. Before the barren liquor and rich liquor heat exchange of cold rich liquor, partial cold rich liquor is shunted to be used for recovering heat regeneration tower top CO2 and H2O (g) regenerated gas afterheat; meanwhile, a high-temperature-resistant inorganic hollow fiber film contactor with nanometer film holes is used as a heat exchange medium between the shunting cold rich liquor and the regenerated gas for replacing an original regeneration tower top regenerated gas external water cooler; the capillary condensation of H2O (g) in the film holes is used for realizing the H2O (g) mass transfer reinforcement and CO2 mass transfer blockage; the convection heat exchange quantity of regeneration gas on the cold rich liquor can be reinforced; the afterheat recovery efficiency of the regenerated gas is greatly improved, so that the regenerated heat loss of the unit CO2 can be greatly reduced.

Description

technical field [0001] The present invention relates to enriched CO 2 CO in gas 2 The technical field of chemical absorption process energy saving and consumption reduction, specifically related to a CO 2 Chemical absorption systems and methods. Background technique [0002] CO based on the principle of gas-liquid chemical reaction 2 Chemical absorption technology is the current CO-rich gas such as biogas, landfill gas, biomass pyrolysis gas and coal combustion 2 Mainstream CO in the gas 2 One of the separation technologies, which has mature technology, wide commercial application, strong adaptability to gas, simple operation and CO 2 It has the advantages of high separation efficiency and high purity of target gas. Traditional rich CO 2 CO in gas 2 The main bottleneck faced by chemical absorption technology is CO 2 High separation cost, which can be attributed to rich CO 2 Absorbent solution regeneration consumes a lot of heat, so CO 2 Regeneration process optimi...

AI Technical Summary

Problems solved by technology

To achieve a higher reduction in consumption, the heat transfer temperature difference must be reduced to 5-10K, but this will inevitably lead to a substantial increase in the heat transfer area, resulting in a large footprint and high investment

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