What is dry ice?
Dry ice is a fascinating white solid form of carbon dioxide (CO2), existing at an incredibly cold temperature of -78.5 ºC. It starts as a colorless liquid under a hefty pressure of 62.50 bar and is quickly transformed into a solid form under decreased pressure levels, using the process of throttling and depressurization.
Physical properties: This crystal-clear white substance sublimates effortlessly at room temperature, releasing a high heat of vaporization. When exposed to atmospheric pressure, dry ice has the remarkable ability to drastically reduce surrounding temperatures. Consequently, it can liquefy and further condense airborne moisture when undergoing sublimation.
The ethereal white smoke you see is steam formed by water vapor droplets or small ice crystals clinging to dust in the atmosphere. This phenomenon is due to dry ice's simple cubic crystal structure, categorizing it as a molecular crystal. It's essentially a single carbon dioxide molecule in structure.
Dry ice crystals are adeptly stacked in varying orientations at both the vertices and centers of the cube, producing its unique structure.
Chemical properties: Dry ice is renowned for its chemical stability. It is completely odorless, non-toxic, non-combustible, and doesn't support combustion. However, excessive carbon dioxide levels in the air can potentially irritate the respiratory system, accelerating breathing and posing a suffocation hazard.
This condition is known as hypoxia. Carbon dioxide's thermal stability is notably high (with only 1.8% decomposition at a scorching 2000 ºC). Dry ice is classified as an acidic oxide, exhibiting properties specific to such compounds, and reacts with water to form carbonic acid.
How is dry ice made?
The production of dry ice begins with the extraction of liquid carbon dioxide from its storage tank. This liquid is then introduced into the ice pressing chamber of the dry ice machine. A nozzle creates a throttling effect, converting the liquid into a substantial quantity of gas and snowflake-like dry ice solids. As these solids accumulate,
Once a specific quantity is achieved, a hydraulic system is triggered, pushing a piston to compress the delicate snowflake-shaped dry ice into sturdy cubes. These are then extruded from the die end. A rotating blade at the machine's end comes into play, expertly shattering the elongated dry ice column into smaller pieces.
This process results in the formation of dry ice pellets, tailored to the required length for various applications.
There are three main principles of dry ice cleaning:
Energy transfer: When dry ice impacts a surface at high velocity, it dissipates its kinetic energy. This energy transfer leads to rapid heat exchange, causing the dry ice to sublime instantaneously. As the dirt cools, it contracts, becoming brittle and easily removable.
Allowing the dirt to be effectively washed away.
Low temperature cracking: When two materials have differing thermal expansion coefficients, a temperature disparity can weaken the bond between them. Dry ice pellets at -78.5 ºC hit the surface, freezing contaminants until they become fragile.
As the dirt melts and bursts, it forms 'cracks' that compromise its adhesion, causing it to detach and fall away.
Micro explosion: Dry ice particles infiltrate dirt cracks, sublimating in milliseconds. This rapid expansion, increasing volume by 600-800 times, forces dirt to peel away from the object's surface.
Brief explanation of the industry application of dry ice cleaning
Dry ice cleaning boasts extensive applications, adeptly removing surface stains from metals, molds, production equipment, and even ancient artifacts. Its non-invasive process eliminates the need for cooling or mold disassembly, preventing corrosive and damaging effects associated with chemical cleaning methods.
Traditional mechanical cleaning methods can inflict damage, causing scratches and reducing mold precision due to repeated handling. Here are more specific examples of dry ice cleaning applications:
1.Petrochemical industry: Unlock the potential of cutting-edge Dry Ice Cleaning technology to effortlessly remove rust and dust from pivotal equipment like main fans, air compressors, exhaust fans, steam turbines, and blowers in petrochemical processes. Remarkably, there's no need to dismantle the blades, thus eliminating the hassle of recalibration for dynamic leveling.
Embrace seamless cleaning of coking deposits in heating furnaces and reactors; efficiently cleanse polyvinyl chloride resin from heat exchangers; and eradicate oil and rust from complex machinery, compressors, storage tanks, boilers, reactors, and condensers. This advanced method simplifies weighing steps, amplifying operational efficiency.
And dust;
2.Power system: Revolutionize your maintenance routine with our solution for direct cleaning of transformers, insulators, distribution cabinets, wires, and cables with live load (below 37 kV). Ensure pristine conditions for generators, motors, rotors, and stators without inflicting any damage.
3.Food production: Seamlessly eliminate baking residue, gelatinous substances, oil stains, and fresh product mixtures pre-baking. Optimize the cleanliness of ovens, mixing equipment, conveyor belts, and molded products with unmatched efficacy.
Meticulously cleanse packaging equipment, furnace racks, furnace plates, containers, rollers, refrigerator inner walls, and biscuit grates to maintain impeccable hygiene standards.
4.Automotive and shipping industry: Effortlessly cleanse car door covers, canopies, carriages, and bottom oil stains without residual water, thus averting water pollution. Expedite the cleansing of car carburetors and paint removal from surfaces; swiftly address engine carbon deposits in vehicles and ships, avoiding harmful chemical agents.
Experience unprecedented efficiency with dry ice cleaning, resolving carbon deposition within a swift 10 minutes, marking a significant reduction in time and cost with a descaling rate of up to 100%.
Efficiently clean the hull, seawater intake valve, seawater condenser, heat exchanger, engine room, mechanical and electrical equipment, ensuring optimal performance and maintenance.
5.Aerospace field: Optimize pre-production processes for missile and aircraft painting and final assembly; facilitate paint removal for composite molds and special aircraft; execute precise engine carbon cleaning, maintenance, and cleaning, especially in the intricate landing gear wheel compartment area.
The Jet engine conversion system offers direct application on the body, significantly reducing time. This method ensures a streamlined process in aerospace maintenance.
6.Printing industry: Employ dry ice cleaning to adeptly remove oil-based and water-based inks and varnishes; effectively clean oil stains and ink deposits on gears, rails, and nozzles, ensuring pristine printed product quality.
Guarantee the longevity and non-wear of printing equipment, preserving its functionality and precision.
Cultural relic cleaning: Dry ice cleaning technology is a game-changer for non-invasive and efficient cleaning of soil, soluble salts, mold, and sedimentary films on cultural relics. Compared to traditional methods, it enhances efficiency, quality, and is environmentally friendly, safeguarding worker health.
This approach elevates cleaning efficiency and quality while being more environmentally considerate and protective of worker health.
Cleaning method and working principle of CHIRUI pellet dry ice cleaning
Parallel to methods like spraying steel sand or glass sand, dry ice blasting propels dry ice particles in a high-pressure stream towards the target surface. The uniqueness of dry ice cleaning lies in its innovative approach.
Upon impact, dry ice particles vaporize instantaneously. The momentum halts, and a rapid heat exchange occurs between the particles and the surface, initiating a transformative cleaning process.
Solid CO2 vapidly sublimes into gas, with particles expanding nearly 800 times in mere milliseconds, instigating a 'micro explosion' at the impact site. This CO2 volatility ensures a meticulous and effective cleaning process.
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| Model |
GT05 |
GT10 |
| Compressed air flow rate |
> 1.1³ /min |
> 2.5³ /min |
| air supply pressure |
0.4-1.0Mpa |
0.6-1.0Mpa |
| Dry ice blasting rate |
0-0.5KG/min |
0-1.0KG/min |
| Dry ice capacity |
5-7.5KG |
12-15KG |
| Dry ice state |
3mm granular |
3mm granular |
| Motor power |
0.37kw |
0.37kw |
| Dimensions (L x W x H) |
512 * 643 * 800 (mm) |
650 * 693 * 900 (mm) |
| Equipment weight |
65KG |
80KG |
| Power supply equipped with |
AC220V/50HZ |
AC220V/50HZ |
| Standard accessory 1 (air connection pipe) |
8m Φ 12mm compressed |
8m Φ 12mm compressed |
| Standard accessory 2 |
Gun handle |
Gun handle |
| Standard accessory 3 |
straight nozzle |
straight nozzle |
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