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what does carbon dioxide

ChristDora Release Time: 1月 9, 2024, 5:49 下午

MechTech Maven - Dedicated to exploring the intersection of mechanics, technology and industry, delivering thoughtful insights and cutting-edge trends.

Solid carbon dioxide is commonly used to cool dairy, meat, frozen foods and other perishable foods during transportation. Gaseous carbon dioxide is used in soft drink carbonation, chemical processing, food preservation processes, chemical and food processing inert protection, welding gas and plant growth stimulant. Used as chemical solvent. At low temperatures, carbon dioxide easily forms solid dry ice. Dry ice liquefies when the pressure increases to about 10 atmospheres. Even at normal temperature, when the pressure reaches 80 atmospheres, it is still liquid and can be used as a solvent and chemical cleaning agent for gasoline, carbon tetrachloride, ether, etc. It is an excellent environmentally friendly and safe solvent. As a special cleaning agent. The extremely low temperatures of dry ice cause special changes in the solidification and shrinkage of many substances. For example, the condensation and shrinkage of grease on the surface of dirt and fibers are separated to achieve the purpose of secondary pollution-free cleaning. It is a new and efficient cleaning method with special application value in many industries such as aerospace, nuclear energy, ships, automobiles, printing, electric power, and molds; Used to create smoke effects on stage. In the past, when the smoke effect was needed, it was produced through the evaporation of polluting aerosols that can easily cause allergies and respiratory infections. Using dry ice to condense water in the air into "smoke" is completely harmless; Cosmetic and medical applications. Solid dry ice can also be used as a material for cryotherapy. Cryotherapy can reduce inflammation. Frozen anti-acne material is mixed with ground dry ice and ethyl ketone, sometimes with a little sulfur added. This type of cryotherapy can reduce acne scars, but it cannot be used to remove them; Used as a swelling agent. In some production processes, such as the manufacture of foam plastics, the material needs to undergo volume expansion and evaporation under a certain temperature and pressure to form a uniform hollow honeycomb structure. Another function of the expansion agent is similar to the "ironing" effect of water vapor, which can be used in the tobacco manufacturing process under low temperature and water-free conditions. According to the gas expansion process, it can be "smoothed". tobacco. At low temperatures and normal pressure, carbon dioxide can be a solid powder. It can be used as an expansion agent within a certain temperature range and will vaporize and expand as the temperature increases. Compared with other foaming agents, it has the advantages of flame retardancy, environmental protection, and low cost. Used as welding shielding gas. The welding process is usually a high-temperature process. Many high-temperature metals will react with oxygen in the air to produce metal oxides, which will seriously affect the quality of the weld, or even prevent welding. Carbon dioxide, nitrogen, argon and other gases are used to protect the weld surface and isolate oxygen. The inert nature of these gases prevents the formation of oxides as they do not easily react with metals. CO2 is used in some metal welding processes with good protective performance, low cost, environmental protection and safety. Used in chemical industry. Carbon dioxide is also commonly used in organic and inorganic chemicals such as sugar, fertilizers and plastics. With further research into its use in the chemical industry, more applications will be discovered. The underground mineral mining process recharges the medium. For example, in oil production, water and carbon dioxide can be injected into oil wells to maximize oil resource production and extend production life. Carbon dioxide injection is more effective than water, but is relatively expensive, especially at low oil prices. It is not widely used, but it is also a relatively safe and large-capacity storage method. Used as a refrigeration preservative for fruits, vegetables and meats. During the storage and transportation process, carbon dioxide is used to protect fruits, vegetables and meat, isolate air, especially oxygen in the air, reduce the oxidation and respiratory consumption of fruits, vegetables and meat, and achieve freshness; it can also prevent organisms that destroy the oxygen of fruits, vegetables and meat. survival needs. By dispensing dry ice directly, the process is simple, reliable, safe and affordable. It has good cooling effect, long service life and obvious advantages. Plants absorb carbon dioxide to produce fuel. There are currently some plants that can extract bio-oil. Terrestrial plants, aquatic plants and algae absorb carbon dioxide through photosynthesis, and finally output petroleum and bio-oil to realize the carbon dioxide regeneration process as fuel. Used as beverage additive. People often drink carbonated drinks in an attempt to dissolve more carbon dioxide in the drink, improve the taste, increase the amount of carbon dioxide absorbed and excreted by the body, and take away more calories; the food industry consumes a lot; Used to extinguish fire. Carbon dioxide has been widely used to extinguish fires. He is a very good firefighter. It has the advantages of self-pressure, environmental protection, cooling, air insulation, and no residue. In addition to a small amount of special metal fire, it can also be used very flexibly. The only drawback is the higher cost compared to water. Artificial rainfall. In addition to condensation in clouds, dry ice is also used as an artificial precipitant to form condensation nodules. At the same time, it also contributes to cooling, causing the water vapor in the cloud to form condensation nodules. This kind of rain and snow will not pollute the environment. Dry ice itself easily forms into granules and powder. It's also very easy to use and cheap. It is a well-deserved main force; Used as plant gas fertilizer. The three elements required for photosynthesis in green plants are carbon dioxide, water and sunlight. However, the concentration of carbon dioxide in the air is very low, and the efficiency of plant photosynthesis is significantly reduced, especially in places with many green plants. Therefore, in recent years, people have discovered that by increasing the concentration of carbon dioxide in the air, the photosynthesis of plants can be greatly improved, thereby greatly accelerating the growth of plants and doubling their ability to absorb carbon dioxide. Used as a means of working energy. This is a new method of utilizing carbon dioxide. It uses low-temperature dry ice to absorb heat from normal-temperature materials such as air and water, causing it to vaporize and expand into high-pressure carbon dioxide gas that is beneficial to aviation machinery for power generation. This changes the traditional way of converting carbon dioxide into other combustible chemicals and allows heat and electricity to be reused. Used as heat pump refrigerant to replace Freon. The boiling point and critical temperature of carbon dioxide determine that it can be a good refrigerant for heat pump air conditioners, refrigerators and water heaters, replacing most existing refrigerants. In the past, compressor technology was immature, and it was not easy to increase the high pressure difference and maintain stable and efficient operation. However, now the industrial production technology is very mature and will further promote the application of its refrigerants. Used as working fluid for energy storage and power generation. This is another important new use. It uses waste liquid to power a compressor, compresses carbon dioxide gas to release a large amount of heat, and becomes a "boiler" heat source. At the same time, the carbon dioxide is stored in low-temperature dry ice at -78.5 degrees Celsius. When electricity is needed, dry ice can absorb heat from the surrounding medium, evaporate and expand, and generate electricity freely. The energy storage and power generation process is environmentally friendly and efficient. It can radiate heat, cold and electricity at the same time. It is the most potential form of energy storage and release.

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