Liquid-liquid split-phase type carbon dioxide absorption and desorption system

Abstract

The invention provides a liquid-liquid split-phase carbon dioxide absorption and desorption system, which comprises an absorption tower, a desorption tower and a heat exchange device, and also comprises a plurality of liquid-liquid separation tanks, a plurality of two-phase mixing tanks, a rich phase mixing tank and a barren liquor mixing tank. A plurality of stages of absorption towers are connected in series; the plurality of liquid-liquid separation tanks and the plurality of two-phase mixing tanks are used for gradually decreasing the flow of the absorption liquid, the CO2 load and the viscosity; the CO2 rich phase in the rich phase mixing pool enters a desorption tower for regeneration after being subjected to thermal induction layering, cold rich liquid shunting and the like; each path of CO2 barren liquor in the barren liquor mixing pool is returned to the absorption tower for cyclic utilization; the absorption liquid is a water-poor mixed amine solvent and contains active ingredients, a phase-promoting separating agent, an anti-sticking agent and a small amount of water. According to the liquid-liquid split-phase type carbon dioxide absorption and desorption system, after CO2 is loaded on the solvent, the viscosity is low, the absorption rate and the capacity are high, rich-phase CO2 is concentrated, the desorption pressure is high, the liquid holdup of each unit is small, the energy consumption is low, the equipment size is small, and the overall carbon capture cost is reduced.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide capture, in particular to a liquid-liquid phase separation type carbon dioxide absorption and desorption system. Background technique [0002] Carbon capture is the most expensive link in the CCUS chain. In the existing capture technology route, post-combustion capture does not require new projects, but only needs to install capture devices on the existing carbon emission sources, and the requirements for facility renovation are low. It is a more feasible promotion plan. Among the technical means of post-combustion capture, the absorption method has good process operability and engineering scalability, and is most expected to achieve large-scale commercial application. The absorption method utilizes the CO absorbed from the solvent 2 CO in the mixed gas of lean liquid and carbon emission source flue gas at low temperature and low pressure 2 A chemical reaction occurs, it is selectively a...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of system is that due to intermolecular interactions such as hydrogen bonds and van der Waals forces, CO 2 The viscosity of the rich phase increases, and can reach more than 100cp at the absorption operating temperature, which is not conducive to CO 2 Mass transfer also significantly increases the energy consumption of the process (such as for solution transportation, heat exchange, etc.); in addition, the existing phase change process is relatively simple, and the potential of phase change to reduce process energy consumption has not been fully utilized

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