The aluminum mesh washable pre-filter supports reuse after cleaning, but it is necessary to strictly follow the cleaning specifications to ensure stable performance. The following is the detailed description:
I. The core basis for washability
Material characteristics
The main body of the aluminum mesh is made of aluminum alloy (such as 6063-T5), and after anodic oxidation treatment, a dense oxide film is formed on the surface, which has the characteristics of corrosion resistance and wear resistance, and can withstand repeated cleaning.
The frame is usually made of aluminum alloy or stainless steel of the same material, with high structural strength and is not prone to deformation during cleaning.
Filtration mechanism
Aluminum mesh physically intercepts large particle contaminants (such as dust, fibers, insects, etc.). These contaminants adhere to the surface or shallow layer of the mesh and do not penetrate deep into the interior of the filter material. Therefore, they can be effectively removed through cleaning.
Cleaning recovery
Experimental data show that after standard cleaning, the recovery rate of filtration efficiency can reach over 95%, the pressure drop can be restored to 90%-98% of the initial value, and the performance attenuation is controllable.
Ii. Cleaning Methods and Precautions
Recommended cleaning process
Step-by-step operation norms and precautions
Pre-treatment uses compressed air (0.6MPa) for reverse purging to remove surface floating dust. The blowing distance should be ≥30cm to avoid deformation of the aluminum mesh caused by the impact of high-pressure air flow.
Soak in a neutral cleaner (pH 6-8) for 10-15 minutes to soften the oil stains. Strong acid/strong alkali cleaning agents are prohibited to avoid corroding the oxide film.
Rinse gently with a high-pressure water gun (≤0.5MPa) or a soft-bristled brush to ensure that there is no residue in the mesh. The direction of water flow should be consistent with that of air flow to avoid reverse flushing that may cause contaminants to embed.
Dry naturally by air-drying or low-temperature drying (≤80℃) to avoid aging of the oxide film caused by high temperature. Do not dry with open flame or expose to direct sunlight to prevent thermal deformation of the aluminum material.
Before installation, check that the mesh is not blocked and the frame is not deformed. If necessary, use an anemometer to test the pressure drop. When the pressure drop increases by ≥20% compared to the initial value, re-cleaning or replacement is required.
Suggested cleaning frequency
High-dust working conditions (such as steel mills and cement plants) : Clean once every 1 to 3 months.
For medium dust conditions (such as electronics factories and shopping malls) : Clean once every 3 to 6 months.
Low-dust working conditions (such as clean laboratories) : Clean once every 6 to 12 months.
(Specifically, it needs to be monitored in combination with a differential pressure gauge. Clean when the final resistance value reaches twice the initial value.)
Iii. Performance Verification after cleaning
Efficiency test
Use a particle counter to detect the interception efficiency for particles ≥5μm. After cleaning, it should not be less than 90% of the initial value.
The actual measured efficiency of a certain electronics factory after cleaning dropped from 89% to 85%, but it still met the H10 grade requirements.
Pressure drop comparison
The pressure drop after cleaning should be restored to 90%-98% of the initial value. If the pressure drop recovery rate is lower than 90%, it may be due to incomplete cleaning or damage to the aluminum mesh.
Visual inspection
The surface of the aluminum mesh should be free from damage and the shedding of the oxide layer, and the mesh holes should have no permanent deformation.
Iv. Situations that cannot be cleaned or need to be replaced
Structural damage
When the aluminum mesh is perforated, torn or the frame deformation exceeds 5mm, it needs to be replaced immediately.
Performance attenuation
After more than 50 cumulative cleanings, even if the appearance remains intact, the filtration efficiency may still decline by 10% to 15%. It is recommended to replace it.
Special working conditions
In high-temperature oil mist or strongly corrosive gas environments, the oxide film on the aluminum mesh may age more rapidly, and the replacement cycle should be shortened (such as 1-2 years).
V. Economic Efficiency and Environmental Friendliness of Cleaning
Cost comparison
The cost of a single cleaning is approximately 0.5 to 2 US dollars (including labor and water and electricity), while the unit price of disposable filter elements of the same specification is 10 to 30 US dollars.
The average annual maintenance cost can be reduced by 70% to 90%.
Environmental protection benefits
Each aluminum mesh filter element can replace 50 to 100 disposable filter elements throughout its entire life cycle, reducing the discharge of solid waste.
Summary: The feasibility of cleaning and using
Applicable scenarios: Conventional industrial and commercial environments with medium or low dust concentration and no strongly corrosive gases.
Key conditions:
Strictly follow the cleaning process;
Regularly test the performance;
Replace the damaged filter element in time.
Advantages: Significantly reduce operation and maintenance costs, minimize resource waste, and align with the concept of sustainable development.
Through scientific cleaning and maintenance, the aluminum mesh washable pre-filter can achieve a service life of 3 to 5 years or even longer, making it an ideal choice for users who pursue economy, environmental protection and stability.