Hot metal spraying dust pollution is not something to be ignored, it must be taken seriously!
Release time:
2019/07/09
Source:
Thermal metal spraying dust,忍无可忍，无需再忍 (Suffering to the limit, no need to endure any longer)
Three words:“Get rid of it”
Thermal spraying refers to heating and melting coating materials, atomizing them into extremely fine particles using a high-speed air stream, and spraying them onto the workpiece surface at a high speed to form a coating. By selecting different coating materials as needed, one or several properties such as wear resistance, corrosion resistance, oxidation resistance, and heat resistance can be obtained.
Some common thermal spraying processes include plasma arc spraying, combustion spraying, arc spraying, wire flame spraying, high-velocity oxy-fuel spraying, cold spraying, and powder flame spraying.
Thermal spraying of metals is used across a wide range of industries and is a common application in metalworking, including automotive, agriculture, aerospace, gas turbines, gas, or petrochemicals.
/ Characteristics of Thermal Metal Spraying Dust /
The process of pollutant or fume generation varies, as does the consumption of materials. The particle size range can be from more than 50 µm to far below 1 µm. Dust and fume generation rates are high. Pollutants from arc wire spraying have a high proportion of fine particles and a higher fume generation rate compared to other processes.
In addition, when these materials are exposed to high temperatures, complex metal compounds such as hexavalent chromium are generated, and the particles can also be abrasive, especially those used in metal spraying.
/ Hazards of Thermal Metal Spraying Dust /
The materials used in thermal spraying are thermal spraying powders. A large amount of dust is generated during the thermal spraying process, which includes fumes and dust. Particles with a diameter of less than 0.1μm are called fumes, and particles with a diameter between 0.1μm and 10μm are called dust.
The temperature of thermal spraying is very high. The temperature of flame spraying is above 3000℃, the temperature of arc spraying is above 6000℃, and the plasma temperature is as high as tens of thousands of degrees. Such high temperatures cause the evaporation of metal elements, and the metal vapor rapidly condenses and oxidizes in the air to form thermal spraying dust of different particle sizes. The dust remains in the air for a relatively long time and floats in the working environment air in the form of aerosols.
The harm of metal dust to the human body depends on the physical and chemical properties of the dust, the amount of dust inhaled by the human body, the route of dust invasion, and the deposition site of the dust. Among them, it can cause respiratory diseases such as asthma and bronchitis (as shown in the figure below).
/ Control Methods for Thermal Metal Spraying Dust /
(1) Source Control
Capturing and controlling the source of thermal spraying dust and fumes. Source capture involves using various types of hoods to extract pollutants to achieve or near source protection of workers and prevent fume migration to other facilities.
Source capture is the most effective and requires the least energy and initial investment to accomplish. Source capture can be achieved using exhaust arms or local fixed hoods.
(2) Ventilation Isolation
A safety enclosure isolates the thermal spraying process from the rest of the equipment and protects the contained area. Safety enclosures are commonly used where hoods near the spraying area are impractical, but the process can be isolated from other parts of the factory. An example is a booth or a zoned area where ventilation is used to control and collect dust, fumes, and gases from the process.
(3) Dust Removal Equipment
In the powder coating process, especially in thermal metal coating systems, powder coating recovery devices and dust filtration dust removal systems must be installed. Whether the air discharged to the atmosphere or the air used in the cycle should meet national environmental protection emission standards, which is currently the most effective way to control dust.
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