Dry Ice Cleaning Research Articles

Dry Ice Cleaning of Electrical Equipment: Revitalize Electrical Assets with Precision Cleaning

Dry Ice Cleaning of Electrical Equipment: Revitalize Electrical Assets with Precision Cleaning

Research on cleaning technology and damage assessment of single-stage compressor rotating blades with dry ice as agent

Numerical investigations based on the Euler-Lagrange approach were carried out first to verify the efficiency of the on-wing cleaning of the compressor blades of aero engines by taking dry ice instead of aqueous solvents as agent. The coupling between particles and the gas phase as well as the interaction between particles and blades were considered by means of comprehensive simulations of the movement of dry ice in the blasting device and the rotating blade channel of the single-stage compressor. Then, the factors that influence dry ice cleaning efficiency were verified and analyzed through dry ice cleaning test on single-stage compressor rotating blades. Finally, the damage assessment of the blade surface and coating under low temperature and impact force was completed. According to the results, the erosion rate cloud map obtained by simulation calculations and the cleaning effect image obtained by the test both showed that the interaction between particles and blades was mainly in the area near the leading edge of the blade. The main variables that affected the cleaning efficiency were the blade rotating speed, the dry ice mass flow rate and the cleaning angle. Furthermore, the highest cleaning efficiency was acquired when the blade rotational speed was 2500 r/min, the dry ice mass flow rate was 6 kg/min and the cleaning angle was 90°. Under these conditions, the blade surface and the coating are not damaged. Dry ice cleaning is a feasible technology in terms of on-wing aero engines, which has broad prospects of applications.

Principle, application and development trend of dry ice cleaning hub fixture

As an engineering technology, industrial cleaning plays an increasingly important role in industrial production; The development of the cleaning industry not only provides effective technical services for the whole society, but also has become an important symbol of today’s social civilization. With the industrialization process of the country and the needs of social production and life, the application field of the cleaning industry is becoming more and more extensive. As an emerging technology, dry ice cleaning has the characteristics of high efficiency, wide application range and no pollution, and is widely used in mold, power electronics, petrochemical and automotive industries. Dry ice cleaning is an advanced and efficient industrial cleaning technology, which has advantages over other cleaning methods in terms of cleaning effect, cleaning applicability, and environmental protection.

Principle, application and development trend of laser cleaning

Many areas of industrial production are inseparable from cleaning technology, and traditional cleaning technology is increasingly unable to meet the requirements of modern industry. Laser cleaning technology is a new cleaning technology with high efficiency and no chemical pollution. It has the characteristics of non-contact, environmental protection, high efficiency, flexibility, energy saving and wide application range. Compared with mechanical friction cleaning, chemical corrosion cleaning, ultrasonic cleaning, dry ice cleaning and other technologies, it has obvious advantages. At present, laser cleaning technology has been widely used in the fields of aerospace body paint removal, cultural relics sample cleaning, mold and mechanical parts product cleaning, mainly used for paint treatment, rust removal, oil removal and particles. This paper discusses the development trend of laser cleaning technology compared with the traditional laser cleaning technology.

Ionic contamination reduction with dry ice cleaning

Compared with routine methods, dry ice cleaning is an innovative, inexpensive and green technology, which efficiently cleans printed circuit boards (PCBs) and decreases levels of ionic contamination. Due to its outstanding performance, dry ice cleaning is suitable for removing flux residues. In this study, boards that have been artificially contaminated by flux were blasted by dry ice with different parameters. The influence of dry ice cleaning on different surface finishes was comprehensively investigated. It was shown that the efficiency of dry ice cleaning is comparable with other methods and is quantifiable. Furthermore, dry ice cleaning can effectively remove pollution on PCB surfaces, yielding a noticeable and ideal cleaning effect without decreasing the solderability of different surface finishes.

Study on Multi-influence Factors of Dry Ice Cleaning Effect Based on Orthogonal Test Method

In order to apply dry ice to the insulator cleaning in power systems, it is necessary to obtain the optimal parameter range of each of the influencing factors. In this paper, a six-factor, five-level orthogonal test method is used to obtain a representative test plan. The influence level of air pressure, dry ice flow rate, cleaning distance, cleaning time, nozzle rotation speed and cleaning time on the cleaning effect were obtained. Results revealed that the optimal range for each cleaning parameter is: air pressure 0.7MPa∼0.8MPa, dry ice flow rate 2.5kg/min∼3.0kg/min, cleaning distance 10cm∼15cm, cleaning angle 10°∼20°, nozzle rotation speed 5∼15r/min, cleaning time 30s∼36s.

Process parameters selection of insulator contamination cleaning by dry ice

The dry ice cleaning was applied to the charged cleaning of the insulators in the power distribution room. On the basis of the system parameters optimization experiments of the insulator dry ice cleaning, setting the air pressure to 0.6 MPa and the dry ice flow rate to 2.5 kg/min, the process parameters optimization experiments of the insulator dry ice cleaning were carried out, and the optimal cleaning process parameters of the insulator were obtained through experiments. Using multi-physics simulation software Comsol to analyze the force distribution of external surface of the insulator when spraying dry ice at different distances and different angles in the dry ice cleaning, the experiment results were verified and the following conclusions were obtained: the cleaning angle and cleaning distance of the nozzle are affecting dry ice cleaning effect. The main process factors of the cleaning effect are most effective when the nozzle cleaning angle is from 15° to 25° and the cleaning distance is from 18 cm to 24 cm.

Investigation on the Process of Dry Ice Cleaning Insulators

Compared with routine methods, the dry ice cleaning as an innovative, inexpensive and green cleaning technology, has excellent insulation and will not cause the pollution flashover accident. Due to the outstanding performance, the dry ice cleaning is very suitable for the insulator cleaning. In this study, the insulators were cleaned by dry ice with different cleaning parameters. The influence of different cleaning parameters on the dry ice cleaning was studied comprehensively. It is shown that reasonable air pressure, cleaning angle, dry ice mass flow, nozzle speed will improve the dry ice cleaning quality greatly, produce a high-efficiency performance. Furthermore, the dry ice cleaning can wash off the pollution of insulator surface effectively, give an obvious and ideal cleaning effect.

Making archaeology cool with dry-ice cleaning

Conservators can use the conceptually simple technology to remove corrosion on wrought-iron objects such as the gun turret recovered from the wreck of the USS Monitor.

The Design of Wireless Control System for Dry Ice Cleaning Device

With a dry Ice cleaning device, a control system is designed based on micro controller module, applying to charged dry ice cleaning operation of exterior insulation in power substation. Micro controller module and wireless communication module is the core of control system. One pipe line upward introduces branch, instead of the traditional 8 pipe lines. It optimizes the pipeline design and reduce the complexity of the device. Electromagnetic compatibility and field operation test were carried out for wireless control system of dry ice cleaning device. The results show that the control system can meet the requirements of electromagnetic compatibility and electromagnetic interference, and meet the requirements of the field operation function and insulation.

Physical Methods for Cleaning and Disinfection of Surfaces

Cleaning and disinfection are important opera- tions in food processing because of the significant contri- butions to product hygiene and food safety. The transfer of residues from surfaces into a product and the contamination with adhering microorganisms must therefore be avoided with sufficient certainty. Traditional methods for the removal of adherents and inactivation of microorganisms are based on thermal, mechanical, or chemical principles and are known to be time- and energy-consuming. This has resulted in a search for alternative methods that show pro- spective potential for their use in food-processing plants. This review gives an overview on such methods, which are based on physical principles. In dry-ice cleaning, for example, carbon dioxide snow pellets are blasted onto a surface to remove adherents through a combined action of thermal and mechanical effects, followed by dissolution of these adherents. Ice-pigging is a procedure where an ice/ water mixture is forced through pipes, heat exchangers, or other equipment to carry off adhered substances. Another method for physical cleaning, mainly described in context with membrane filtration, is to use vibration in the ultra- sonic frequency domain to reduce fouling and to stabilize permeate flux. Radiation from various sources (UV lamps, radionuclides, X-ray tubes) differs in its applicability and disinfection efficiency because of differences in energy and penetration depth. Cold plasma treatment is another prom- ising technology that is currently under investigation for cleaning and disinfection of surfaces of inorganic and organic materials.

Effective removal of field-emitting sites from metallic surfaces by dry ice cleaning

Systematic results of the field emission properties of polycrystalline copper and niobium and single-crystal Nb are reported. Dry ice cleaning (DIC) is found to suppress enhanced field emission from metallic surfaces. The cleaning effect on the emitting sites was investigated by means of field emission scanning microscopy up to fields of 250 MV/m and high-resolution scanning electron microscopy with energy dispersive x-ray analysis. The number density of emitters at given fields was drastically reduced by dry ice cleaning. Current-voltage measurements and derived Fowler-Nordheim parameters are partially discussed with respect to the morphology and impurity content of localized emitters. No emission from grain boundaries on large-grain Nb samples was observed. The microscopy results prove the effective removal of field-emitting particulates down to 400 nm as well as the partial smoothing of surface protrusions by DIC.