Carbon dioxide gathering method combining membrane permeation and low temperature phase transition

Abstract

The invention discloses a carbon dioxide gathering method combining membrane permeation and low temperature phase transition. The method comprises the steps: firstly, feeding a mixed gas of CO2, N2 and H2O into a condenser pipe and placing the condenser pipe in a 60 DEG C environment to liquefy water vapor into liquid water and discharging the liquid water; introducing CO2 and N2 into a hollow fiber gas membrane separator in a gas-state from, placing a permeable gas in a 120 DEG C environment through the membrane penetration, solidifying CO2 into solid, freezing the solid-state CO2 on the surface of a heat exchanger, and discharging a non-permeable gas; then scraping the solid-state CO2 off, placing the solid-state CO2 and the gaseous N2 in a 80 DEG C environment, storing the high-purity solid-state CO2, and discharging the N2 gas. The carbon dioxide gathering method combining the membrane the permeation and low temperature phase transition realizes the separation of H2O and CO2 in different parts by combining the membrane penetration and the low temperature phase transition, improves the purity of CO2 products and avoids the drawbacks of high costs and huge energy consumption in a simple membrane penetration and simple low temperature phase transition process.

Description

technical field [0001] The invention relates to a low-temperature composite gas separation method, in particular to a low-temperature membrane permeation and low-temperature phase change composite CO 2 capture method. Background technique [0002] Global warming and the greenhouse gas CO 2 Emission reduction is currently a hot and difficult issue of global concern. The use of clean energy to replace fossil energy is to control and reduce CO 2 The most ideal way to discharge emissions, but the adjustments to the energy structure in a short period of time are very limited. In this context, scientists from various countries in CO 2 A lot of research has been done in the field of capture, reuse and storage technologies to mitigate issues such as the greenhouse effect caused by the use of fossil fuels. Among them, CO 2 The capture process is the most basic and important link in the entire CCUS (Carbon Capture, Utilization and Storage) process. However, currently CO 2 The ...

AI Technical Summary

Problems solved by technology

For polymer membrane materials, the separation performance is generally not high, and it is easily limited by the "Robeson upper limit", and there is a mutual restriction between the permeability and selectivity of the membrane.

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