Carbon dioxide capture and storage technology (CCUS) refers to the carbon dioxide from large sources (such as power plants, chemical plants, etc.) to capture, transport and deep underground reservoirs for permanent storage technology is to achieve clean and efficient use of coal, One of the effective technical means of climate change. The captured carbon dioxide is injected into the reservoir at supercritical pressure. The multiphase flow in the porous structure of the reservoir and the chemical reaction between the reservoir water and the rock directly affect the occurrence of carbon dioxide in the reservoir, which is the carbon dioxide geological storage The key to long – term safety evaluation. However, it is difficult to predict the high-pressure visualization experiment, which can not predict the influence of deep reservoir pressure variation on long-term storage safety.
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National key research and development program “Clean and efficient use of coal and new energy-saving technology” key special 2016 project “CO2 low energy consumption and geological storage and utilization of key basic scientific research” project made important progress. Tsinghua University, Professor Jiang Peixue team established a porous and mesoscale high pressure visualization experimental system to achieve the supercritical pressure (greater than 7.4MPa) two-phase interface real-time tracking and quantitative measurement, revealing the interface and structural changes on the two-phase flow Micro mechanism. The team found that mineral dissolution was changed by expanding the pore throat diameter and reducing the specific surface area to alter the pore structure, causing changes in the carbon dioxide / water capillary pressure curve and relative permeability. Meanwhile, when the reservoir pressure was reduced, the first experiment found that CO2 The combination of chemical reaction and porous multiphase flow produces a self-sealing mechanism that prevents the rapid movement of CO2 in the reservoir.
(“Effect of Mineral Dissolution / Precipitation and Precipitation and CO2 Exsolution on CO2 Transport in Geological Carbon Storage”) on August 16th in the paper “The results of the study” The effect of mineral dissolution / precipitation and CO2 precipitation on carbon dioxide Journal of Chemical Industry (Topics: Chemistry in Carbon Geological Enclosures) published online.
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