Chinese name: dry ice English name: dry ice definition 1: solid carbon dioxide (CO2), white. It will sublimate into gas at -78.5℃ and ambient atmospheric pressure, and serve as Leng Yun catalyst in weather modification, with molecular weight of 44.11 density (solid state) 1561kg/m3(-78℃) melting point -57℃ freezing point-78.5℃ triple point-56.6℃ 5.17 * 11 5 Pascal critical point of 31℃ 7.37 *. Dissolution is in water (volume ratio 1:1), and carbonic acid is partially generated. The liquid-to-gas ratio is 8.726SCF (gas) /LB (liquid -17.8℃, pressure 21kg/cm), and the liquid-to-solid ratio is 1.46 (-17.8℃) and 1.57 (-48℃), which are widely used. Dry ice is widely used in food, health, industry and catering. Mainly include: 1. Application scope of dry ice in industrial molds: tire mold, rubber mold, polyurethane mold, polyethylene mold, PET mold, foam mold, injection mold, alloy die-casting mold, hot core box for casting, cold core box, which can remove residual resin, invalid stripping layer, carbonized film agent and oil stain, and open vent holes. After cleaning, the mold is as bright as new. On-line cleaning does not need to cool down and disassemble the mold, which avoids the corrosion and damage to the mold by chemical cleaning method, the mechanical damage and scratch to the mold by mechanical cleaning method, and the decline of mold accuracy caused by repeated loading and unloading. Crucially, the two most time-consuming steps of disassembling the mold and waiting for the mold to cool down can be omitted, which can reduce the downtime by about 81%-95%. Benefits of dry ice cleaning: dry ice cleaning can reduce downtime; Reduce equipment damage; Very effective cleaning of high-temperature equipment; Reduce or reduce the use of solvents; Improving the safety of staff; Improve maintenance efficiency; Reduce production downtime, reduce costs and improve production efficiency. 2. Application scope of dry ice in petrochemical industry Cleaning of main fans, air compressors, hoods, steam turbines, blowers and other equipment and removal of coking and carbon deposits in various heating furnaces and reactors. Clean the PVC resin on the heat exchanger; Remove oil, rust, hydrocarbons and dirt on the surfaces of various pressure vessels such as compressors, storage tanks and boilers; Clean the reaction kettle and condenser; Complex organism decontamination; Furnace tube cleaning, etc. 3. The application scope of dry ice in food and pharmaceutical industry can successfully remove baking residues, colloidal substances and oil stains in the oven and the mixture of fresh products before baking. Effective cleaning oven, mixing and stirring equipment, conveyor belt, molded products, packaging equipment, stove rack, stove plate, container, roller shaft, refrigerator inner wall, biscuit stove bar, etc. Benefits of dry ice cleaning: eliminating the use of harmful chemicals, avoiding production equipment from contacting harmful chemicals and generating secondary garbage; Prepare or remove salmonella, listeria and other bacteria, and disinfect and clean them more thoroughly; Eliminate the damage of water jet cleaning to electronic equipment; Minimum equipment decomposition; Reduce downtime. 4. Application scope of dry ice in printing industry It is very difficult to remove ink, and the accumulation of ink on gears and guide rails will lead to poor printing quality. Dry ice cleaning can remove all kinds of oil-based and water-based inks and varnishes, clean up oil stains, accumulated inks and dyes on gears, guide rails and nozzles, and avoid the discharge of hazardous wastes and solutions and personal injuries caused by hazardous solvents. 5. The application scope of dry ice in electric power industry can clean electric boilers, condensers and various heat exchangers; It can directly clean indoor and outdoor transformers, insulators, distribution cabinets, wires and cables under live load (below 37KV); Generator, motor, rotor, stator and other parts are cleaned without damage; Cleaning of rust, hydrocarbons and adhesive powder on the turbine, impeller, blades and other parts, without removing the blades, eliminating the need to readjust the dynamic balance of the blades. Benefits of dry ice cleaning: effectively decompose the pollutants to be cleaned; Because these pollutants are removed, the power loss is reduced; The maintenance cost of external equipment and its basic equipment is reduced; Improve the reliability of power system; Non-abrasive cleaning to keep the insulator intact; More suitable for preventive maintenance. 6. Application scope of dry ice in automobile industry Cleaning doorskins, roofs, carriages, car bottoms and other oil stains will not cause water pollution; Car carburetor cleaning and car surface paint removal; Remove carbon deposits from the engine. If carbon deposit is treated, it takes a long time to treat it with chemical agents, at least for more than 48 hours, and the agents are harmful to human body. Dry ice cleaning can completely solve the problem of carbon deposition within 11 minutes, which saves time and reduces the cost, and the scale removal rate reaches 111%. 7. Application scope of dry ice in electronic industry Cleaning grease and dirt inside robots and automation equipment; Removal of integrated circuit board, post-weld flux, contaminated coating, resin, solvent coating, protective layer and photosensitive corrosion inhibitor on printed circuit board. 8. The application scope of dry ice in aerospace: the pre-process of painting and assembly of missiles and aircraft; Paint removal of composite molds and special aircraft; Engine carbon cleaning; Maintenance and cleaning (especially landing gear-wheel cabin area); Depainting of aircraft shell; Jet engine conversion system. Can work directly in the machine body, saving time. 9. Application scope of dry ice in shipbuilding industry: hull; Seawater suction valve; Seawater condenser and heat exchanger; The machine room, machinery and electrical equipment are cleaner than the general high-pressure water jet cleaning. 11. Application scope of dry ice in nuclear industry If traditional cleaning methods such as water, sand blasting or chemical decontaminating agent are used to clean nuclear industry equipment, the media such as water, sand blasting or chemical decontaminating agent are also polluted by radioactive elements, so it takes time and money to treat these media which are polluted twice. However, with the dry ice cleaning process, dry ice particles are directly sprayed to the cleaned object, which instantly sublimates, and there is no problem of secondary pollution. What needs to be treated is only the cleaned wastes with nuclear pollution and scale. 11, the scope of application of dry ice in the beauty industry Some dermatologists use dry ice to treat acne, which is called cryotherapy. Because it will slightly freeze the skin. There is a kind of frozen material for treating acne, which is mixed with ground dry ice and ethyl ketone, sometimes with some sulfur. Liquid nitrogen and solid dry ice can also be used as cryotherapy materials. Cryotherapy can reduce inflammation. Some time ago, the news reported that Liu Xiang used this cryotherapy to treat acne on his face. This method can reduce the generation of acne scars, but it is not used to remove scars. 12. Application scope of dry ice in food industry A Adding dry ice to wine, cocktail or beverage is cool and delicious when drinking, and the cup is full of smoke, which is very pleasant. B when making ice cream, dry ice is added, and the ice cream is not easy to melt. Dry ice is especially suitable for cold storage of takeaway ice cream. The seafood specialty dishes made by C-star hotels and restaurants, when served with dry ice, can produce white smoke landscape and improve the banquet level, such as making lobster sashimi. D seafood such as lobster, crab and shark's fin are frozen and refrigerated. Dry ice will not change water, and it is cleaner and cleaner than water-cooled storage. It is widely used in Europe, America, Japan and other countries. 13. Application scope of dry ice in the field of refrigeration and transportation A Low-temperature refrigeration medical use and low-temperature transportation of special drugs such as plasma and vaccines. B Long-distance and short-distance transportation of electronic cryogenic materials and precision components. C preservation and transportation of high-grade food such as high-grade beef and mutton. 14. The application of dry ice in the entertainment field is widely used for making smoke on stage, theater, film and television, wedding, celebration, party effect, etc. For example, some programs in the National Theatre are made of dry ice. 15. Application scope of dry ice in fire fighting industry Dry ice is used for fire fighting and extinguishing, such as some low-temperature fire extinguishers, but the application of dry ice in this area is less, that is, the market level is low.