To protect the environment and reduce carbon dioxide emissions, humans have come up with all kinds of methods. Today, the young player Newredite introduced the methods of capturing carbon dioxide gas. At present, capturing carbon dioxide is a mature technology and compressing it is not difficult. However, abandoned oil fields and natural gas mines or salt layers are transported and stored by ships or pipelines. (saline formation), it still requires assessment and development. This is a stopgap measure, merely a transitional practice before the mature development and formation of low-carbon technologies. Even so, commercialization still has a long way to go, and such large-scale recycling and storage facilities have not yet emerged. The following are some practices related to chemistry.
The gas (or smoke) produced after combustion :flue gas is not only carbon dioxide, but also nitrogen, oxygen and water vapor, and therefore needs to be separated. The common method is to use amine as a solvent to absorb carbon dioxide and then release it by heating. In this way, carbon dioxide is pure enough and can be stored directly without treatment. However, this approach requires energy consumption. Currently, approximately 25% of the power plant’s energy is needed, so there are still no large-scale commercial transfer facilities. Other methods include the use of thin-film technology to separate gases or the use of solid adsorbents, all of which require the development of new materials and are still in the research stage. Another potential new technology (chemical looping) that adopts the chemical cycling method is that metal oxides are first produced by the reaction of metal powder particles with oxygen, and then the metal oxides are introduced into the combustion chamber. When coal reacts, carbon oxidizes to produce carbon dioxide, and metal oxides return to the metal. Not only is very pure carbon dioxide produced, but the metal can also be recycled. This method can prevent the entry of air or pure oxygen and indirectly utilize metal oxides to provide oxygen, thereby avoiding the problem of gas purification. If petroleum or natural gas is used, the water vapor produced is not difficult to separate. However, this method still requires engineers to design and overcome the damage caused by the friction of solid metals and metal oxides in the reaction chamber and the conveying pipeline. Chemical recycling involves the reaction of metals with oxygen in the air to form oxides. These metal oxides are then introduced into the combustion chamber where they undergo oxidation-reduction reactions with coal, generating pure carbon dioxide and recyclable reduced metals.
Pre-combustion capture method
This method involves not completely burning coal first to produce carbon monoxide and hydrogen (referred to as water gas), and then introducing steam and carbon monoxide for a water gas conversion reaction. (water-gas shift reaction;) Hydrogen and carbon dioxide are produced. Carbon dioxide is removed through adsorption, and the remaining hydrogen is used as fuel. The theme of this method includes the separation of carbon dioxide to reduce the energy consumed by this method. It is still necessary to develop a tool suitable for hydrogen as fuel.
National Standard for Carbon dioxide
This method basically requires the combustion of pure oxygen, petroleum or natural gas. Flue gas still contains excessive oxygen and can be recycled. The advantage is that only carbon dioxide and water vapor are ultimately produced. However, manufacturing pure oxygen is very energy-consuming and the design of the furnace needs to be improved.
Post time: May-06-2025