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Overview:Laser cleaning is a surface engineering technology that uses the high-energy characteristic of laser to remove attachments on the substrate. It was first applied in the field of microelectronics. Because of its green environmental protection, high efficiency, high precision, and wide application range, it has been gradually promoted in the fields of mould, building, ship, aerospace, high-speed railway, and so on. It is regarded as the most potential cleaning technology in the 21st century. As a pillar industry of national economy, there are rare reports on the application of laser cleaning technology in petrochemical industry. During the operation of petrochemical equipment, many kinds of dirt (such as atmospheric dirt, water scale and the dirt generated by chemical reaction) are deposited, and defects (such as wear and corrosion) may be generated in critical areas and parts of the equipment. Whether it is dirt removal or surface cleaning before defect detection, cleaning technology is needed. Petrochemical industry now commonly uses chemical cleaning technology and physical cleaning technology. Chemical cleaning technology produces waste liquid and waste water, which will cause the problem of environmental protection. The physical cleaning technology includes traditional poking, brushing, grinding, shoveling and so on, which is highly labor intensive and inefficient. Later, PIG cleaning technology and jet cleaning technology (such as sandblast cleaning, shot peening cleaning, dry ice cleaning, and high-pressure water jet cleaning) are developed. The former is only applicable to the internal cleaning of pipes and equipment, and the latter may cause accidental mechanical damage and wear to the cleaned objects. In addition, ultrasonic cleaning technology is harmful to human health due to its noise pollution, and drying process is needed after the cleaning. The demand of cleaning technology has become increasingly urged in modern petrochemical industry, the cleaning costs should be reduced and cleaning efficiency, and the quality should be improved. Moreover, the cleaning technology must be environmentally friendly. Obviously, chemical cleaning technology and traditional physical cleaning technology cannot fully meet these new requirements. Hence, it is necessary to explore and introduce new green cleaning technology, such as laser cleaning technology. In recent years, the work of mechanism research, experimental verification, process optimization, and practical applications conducted by domestic and foreign colleges, enterprises and research institutes has provided a theoretical basis and ideal reference for the application of laser cleaning in the petrochemical field. In this paper, the cleaning needs and technology status of petrochemical industry and the development of laser cleaning technology are introduced, and the application occasions of laser cleaning technology in petrochemical field are analyzed. In addition, the specific research directions and application prospect are pointed out.
The schematics of laser cleaning
(a) Chemical cleaning; (b) PIG cleaning; (c) Sandblast cleaning; (d) High-pressure water jet cleaning[12]
Different objects for laser cleaning. (a) Attachment; (b) Gas in attachment layer; (c) Matrix; (d) Pre-coated membrane
Micrograph and infrared spectrum of laser cleaning sample. (a) Micrograph after cleaning; (b) Infrared spectrum before and after cleaning[20]
(a) 200 W laser cleaning machine; (b) Laser cleaning wheel; (c) Laser cleaning mold
Three-dimensional morphology of substrate surface after de-painting at different laser powers. (a) 10 W; (b) 15 W; (c) 20 W[34]
Photographs of the smoking smudges before laser cleaning (a) and after laser partly cleaning (b)[5]
Surface composition (a) and three-dimensional morphology (b) of 304 stainless steel sample after 400 W laser cleaning[45]
(a) Plate heat exchanger[12]; (b) High-pressure water cleaning heat exchange plates[12]; (c) Laser cleaning heat exchange plates
(a) Boiler steam drum[12]; (b) Cleaning and maintenance[12]; (c) Laser cleaning equipment weld