Compressor application in carbon dioxide gas industry
Carbon dioxide (carbon dioxide), a kind of carbon oxygen compound, has a chemical formula of CO2 and a chemical formula weight of 44.0095. It is a colorless, odorless or colorless odorless gas at room temperature and pressure, and its aqueous solution has a slightly sour gas. It is also a common Greenhouse gases are also one of the components of the air (0.03%-0.04% of the total volume of the atmosphere). In terms of physical properties, carbon dioxide has a melting point of -56.6°C and a boiling point of -78.5°C. It has a higher density than air (under standard conditions) and is soluble in water. In terms of chemical properties, carbon dioxide is chemically inactive, has high thermal stability (only 1.8% decomposition at 2000°C), cannot burn, and usually does not support combustion. It is an acidic oxide with the generality of acidic oxide. Because it reacts with water to produce carbonic acid, it is an anhydride of carbonic acid.
Carbon dioxide can generally be produced by high-temperature calcined limestone or by the reaction of limestone and dilute hydrochloric acid. It is mainly used for refrigerating perishable food (solid), as a refrigerant (liquid), manufacturing carbonized soft drinks (gaseous) and as a solvent for homogeneous reaction ( Supercritical state) and so on. Regarding its toxicity, studies have shown that low-concentration carbon dioxide is not toxic, and high-concentration carbon dioxide can poison animals.
main application:
High-purity carbon dioxide is mainly used in the electronics industry, medical research and clinical diagnosis, carbon dioxide lasers, calibration gas for testing instruments and the preparation of other special mixed gas, and it is used as a regulator in polyethylene polymerization. Solid carbon dioxide is widely used in refrigerating dairy products, meat, frozen food and other foods that are perishable during transportation. It is used as a refrigerant in many industrial processes, such as crushing heat-sensitive materials, rubber polishing, cold metal processing, and shrinking assembly of mechanical parts , Vacuum cold trap, etc. Gaseous carbon dioxide is used for carbonized soft drinks, pH control in water treatment processes, chemical processing, food preservation, inert protection in chemical and food processing, welding gas, plant growth stimulant, used in hardening molds and cores and used in casting Pneumatic devices are also used as a diluent for sterilization gas (that is, a mixture of ethylene oxide and carbon dioxide is used as a sterilization, insecticide, and fumigant. It is widely used in the sterilization of medical appliances, packaging materials, clothing, fur, bedding, etc. , Bone meal disinfection, fumigation of warehouses, factories, cultural relics and books). Liquid carbon dioxide is used as a refrigerant, low-temperature tests of aircraft, missiles and electronic components, to improve oil well recovery, rubber polishing and control chemical reactions, and can also be used as a fire extinguishing agent. Supercritical carbon dioxide can be used as a solvent to dissolve non-polar, non-ionic and low molecular weight compounds, so it is widely used in homogeneous reactions.
The carbon dioxide compressor refers to a compressor used to pressurize and deliver carbon dioxide gas. Mainly used in urea synthesis equipment. When designing and using, it should be noted that the critical temperature of carbon dioxide is high, and it can be liquefied at 31.3℃ and 7.14MPa. When used in winter, the inter-stage cooling temperature cannot be too low; when the carbon dioxide is below 60MPa, it is conducive to gas compression; due to carbon dioxide gas The relative density is relatively large, it is not suitable to use too large average piston speed, otherwise the valve resistance will be large; carbon dioxide gas contains a small amount of water and is highly corrosive, so the valve, cooler and buffer tank must be made of stainless steel.
