For a long time, the use of water-based paint to repair bruises must be carried out by professionals. In addition, many people know that there is no way to avoid "water". The above situation has led to the implementation of laws on environmental protection in body shop.
One of the key factors is air purification: special emphasis should be placed!
Air is one of the main energy carriers in body shop. It is produced by the compressor and then sent to the gas supply line. At the same time, pollutants such as lubricating oil are also brought to the user. They usually do not affect pneumatic tools such as screwdrivers or polishers.
However, for high-quality spraying work, residual oil and condensed water, even a very small amount of residual oil or condensed water, can cause coating defects. They usually produce very small craters, which inevitably lead to complaints about the quality of the film. At this time, it is necessary to rework, resulting in huge cost waste. Not only do traditional solvent coatings cause these problems, but water-soluble coatings can also cause these problems.
Filter systems with multi-section filters (eg SATA0/444) are now a must-have for auto repair shops. They separate contaminants from the required compressed air (eg, residual oil, condensate, suspended matter, etc.) with a filtration rating of less than 0.01 microns. When particularly fine oil vapors are flushed into the gas stream, there is usually an odor, which indicates that the above equipment has reached its limit. These tiny oil residues can cause trouble.
In this case, adding an activated carbon filter will solve the problem. Media must be used (eg using a supplied-air breathing mask) to ensure that the user does not come into contact with oil residues, even a very small amount of oil residue.
Activated carbon filters can also be used to purify the spray air without any restrictions. They isolate the various oil residues from the required air in an absolutely reliable manner. After the filter element of the activated carbon filter is saturated, it must be replaced immediately.
The activated carbon filter is modular in construction and can be easily connected to any existing and past SATA filter unit. There is a small glass plate in front of the display bar. It is able to consistently display performance levels and lifetime on SATA activated carbon filter 0/464 by changing color. This makes maintenance easy and safe, so you don't miss the proper filter cartridge replacement time.
How the activated carbon filter works:
The working process of activated carbon can be simply summarized as:
I Water collection: Raw water flows from above the activated carbon tower tank and flows out under the activated carbon filter device to obtain water quality such as impurities and odor.
II Backwash: The purpose is to expel the deposit above the activated carbon. After a period of filtration, a number of impurities are deposited on top of the activated carbon and removed.
III sinking: The activated carbon will float when backwashing, and all the valves will be closed after the backwashing is completed to cause the activated carbon to sink due to gravity.
IV Washing: In the backwash, there is fear that impurities will be attached to the activated carbon and washed with positive washing to avoid contamination of the water during water harvesting.
The working mode of activated carbon is to operate in the above five steps. However, there are certain differences in the timing of each step.
Design parameters of pressure activated carbon filter:
The main design parameters of the pressure activated carbon filter include: filtration rate (m / h) or hydraulic load (m3 / m3 • • min), the height of the activated carbon layer and backwash strength. An on-site carbon column test shall be carried out to verify the relevant design parameters according to the raw water quality. If there is no condition for on-site testing, there is no special requirement for the effluent water quality. One filter speed is 3~10m/h, the activated carbon layer height is 2~3m, and the backwashing strength is 4~12L/s•m2.
From the conclusions of the previously published carbon column test report, some basic laws can be analyzed for design reference. First, reduce the filtration rate (ie, reduce the hydraulic load, people can increase the utilization rate of carbon, extend the regeneration cycle of carbon, but under the condition that the water production is constant, reducing the filtration speed will increase the area of ​​development, that is, increase the no filter. The diameter of the carbon is increased once, and the area of ​​the machine room is required. Similarly, increasing the thickness of the carbon layer (multi-column series is also equivalent to increasing the thickness of the carbon layer) can improve the utilization of the carbon layer and improve the safety of the effluent. However, this will increase the amount of carbon used once and the height of the machine room is high. In the actual design, under the premise of ensuring the quality of the effluent, the conditions of the machine room (including area, height), the utilization rate of carbon, and the carbon change should be considered. The technical factors such as the cycle, determine the design parameters.
In addition, the removal of organic matter by activated carbon is an adsorption process, rather than a mechanical shut-off process like sand filtration. Backwashing can remove the impurities in the surface of the sand column and the gap of the filter material, but can not remove the organic matter adsorbed by the activated carbon. Instead, it will move the saturated carbon particles from the upper layer to the lower layer than the change of the density of the old carbon particles, which will affect the treatment effect. Therefore, before entering the activated carbon filter, mechanical impurities should be filtered out as much as possible; in the process of carbon filtration, it is necessary to backwash as little as possible, instead of surface washing.
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