Separation system and method for carbon dioxide in medium-high pressure air source

Abstract

The invention provides a separation system and method for carbon dioxide in a medium-high pressure air source. CO2 rich liquor from an absorption tower is subjected to pressure reduction and regenerated step by step in modes such as flash evaporation, high-pressure desorption and low-pressure desorption, the high-pressure characteristic of a CO2 air source is fully used, and input of external heatconsumption is reduced; the low-energy-consumption and low-cost requirements are met; high-temperature desorbed air of the tower top of a high-pressure desorption tower is introduced into a reboilerof a low-pressure desorption tower and used for a heating desorption heat source, external heat consumption required by the low-pressure desorption tower is reduced, and meanwhile the cooling-water consumption of a desorbed air cooler is reduced; barren liquor and semi-barren liquor from the high-pressure desorption tower and the low-pressure desorption tower enter from an upper-section filler anda lower-section filler of the absorption tower respectively, reaction temperatures at all portions of a tower body can be kept uniform, it is avoided that the local temperature is over high, and degradation and loss of an absorbent are reduced. According to the separation system and method for carbon dioxide in the medium-high pressure air source, the high-pressure characteristic of the CO2 air source is fully used, the input of the external heat consumption is reduced, and the low-energy-consumption and low-cost requirements are met.

Description

technical field [0001] The invention belongs to the technical fields of gas separation technology and carbon dioxide emission reduction, and in particular relates to a separation system and method for carbon dioxide in a medium-high pressure gas source. Background technique [0002] Global climate change has seriously threatened the sustainable development of human society, living environment and economy. In 2013, the "Fifth Climate Change Assessment Report" released by the Intergovernmental Panel on Climate Change (IPCC) pointed out that the increase in the concentration of greenhouse gases is the main driver of climate change, CO 2 It is the greenhouse gas that contributes the most to the temperature rise effect, and the control of climate change requires a substantial and continuous reduction of CO 2 emission. In 2018, the IPCC once again issued a serious warning on global warming, CO 2 It is imperative to control emissions and increase the global warming target from w...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a separation system and method for carbon dioxide in a medium-high pressure gas source, which solves the problem of existing normal pressure CO 2 The separation process cannot achieve medium and high pressure CO 2 removal of

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