A cartridge filter is a tube thing that people use in all sorts of industries to get rid of stuff they don’t want in their water. It’s got a housing around it, and it takes all the chemicals and pollutants out of the water so you can have clean and safe water.
Concept
Most cartridge filters we usually refer to are used to filter gases and are called air cartridges filters(after this, referred to as cartridge filters), used mainly in cartridge-type dust collectors or industrial dust collector.
The filter cartridge is a surface filtration element that uses the tiny permeable tissue formed on the surface of the filter material to block out airborne particulate matter.
The filter cartridge is made of a certain length of stiff filter material folded into pleats and glued at the beginning and end. The filter cartridge has no cage bone and is easy to install.
The cartridge filter is a commonly used dust capture device with a high capture rate, low resistance, easy to put into the flue for sampling, etc. It is widely used to filter pollutants such as particulate matter, catering fumes, asphalt fumes, chromic acid mist, sulfuric acid mist, etc.
According to the filter material, there are two kinds of filter cartridges: fiber cartridges and corundum cartridges. The most widely used daily is synthetic fiber cartridges.
Very few cartridges are made of ultra-fine glass fibers to achieve higher filtration efficiency, which can capture dust particles with a diameter of 0.3μm and below by more than 99.997%. Cartridges made of glass fiber are relatively more difficult and costly to produce.
Structure of the filter cartridge
The structure of the filter cartridge is divided into four parts: top cover, metal frame, pleated filter material, and base.
The filter cartridge is made of synthetic, glass, or wood pulp fiber folded into pleats, the first and last glued into a cartridge.
A metal frame supports the inside and outside of the cartridge, and the top cover and the base fix the top and bottom.
The top cover has set bolts and washers. When the filter cartridge of the dust collector is made, the adhesion of the upper and lower end caps of the filter cartridge and the guard net should be reliable, and there should be no defects such as debonding, leakage, and flow hanging.
The metal parts on the filter cartridge should meet the requirements of rust prevention; the outer surface of the filter cartridge should have no apparent defects, such as scars, bumps, bristles, and burrs.
Types of filter cartridges
There are wide varieties of filter cartridges. Generally speaking, there are thin and long and thick and short.
Long and narrow filter cartridge (such as φ ≤ 160mm, L = 1 ~ 2m), its pleat spacing gap is large (such as 45 pleats), the angle is large, pleat less and shallow, filtering area than the same diameter and length of the filter bag 2 ~ 5 times larger, easy and effective dust cleaning; suitable for concentration ≥ 15g/m2 dust filtration and dust removal, filtering airspeed 0.6 ~ 1.2m / min.
Thick and short filter cartridge (such as φ350mm, L = 0.66m) Large diameter, short length, more pleats (120 ~ 350 pleats) and deep, the small gap between pleats, large filtration area, compared with the same diameter and length filter bag area 14 ~ 35 times larger, suitable for small site area; but because the pleat angle is small, dust is easy to accumulate and challenging to clean, it is ideal for concentration ≤ 5g/m2 dust filtration and dust removal, filtration air speed should not be > 0.6m/min.
The volume of the dust collector filter is highly related to the volume of the cartridge-type dust collectors.
When designing or purchasing filter cartridges, notes the following points.
- The total height of the dust collector and the distance between the inlet and outlet (width).
- The design and installation method of the upper and lower end caps of the filter cartridge.
- Size of the filter cartridge.
- Performance requirements related to filtration accuracy and filtration characteristics.
- What air quality is expected?
Filter materials for cartridge dust collector filters
There are two types of filter materials for filter cartridges: one is synthetic fiber filter material, and the other is paper filter material.
Synthetic fiber spunbond material for filter material can be divided into continuous fiber spun-bond polyester hot press and short fiber spun-bond polyester hot press according to the processing technology. For high temperatures, high humidity, and other special conditions, the choice of filter cartridge filter material should meet the application requirements.
The paper filter material can be divided into two types: low permeability and high permeability. In addition, there are synthetic fiber non-woven PTFE-coated filter material and paper PTFE-coated filter material.
Some technical requirements for the filter material of the cartridge collector filter
1. When using a continuous fiber spunbond hot pressing process, the microporous structure of the filter material should be tight, and the stiffness should be not less than 20mN and have a surface filtration mechanism.
2. When using the spun-bond polyester hot rolling process, the stiffness of the filter material should meet the designed requirements, and the filter material should not change color and have no color difference.
3. When the filter material is used for moist dust conditions, the filter material should be treated with surface waterproofing, the infiltration angle of the treated filter material should not be less than 100 degrees, and the level of water contamination should not be less than IIV.
4. When the filter material is used for oil-containing dust conditions, the material should be treated with an oil-proof surface.
5. When the filter material is used for anti-static dust removal, the material should be anti-static treated.
6. The highest continuous working temperature of synthetic fiber non-woven filter material is 120℃.
7. Polyphenylene sulfide (Ryton), aromatic polyamide (Nomex) fiber sticky filter material maximum continuous working temperature is 190 ° C.
Installation of filter cartridges in pulse dust collector
There are three ways to install the filter cartridge in the pulse dust collector: vertical, inclined, and horizontal installation.
When the filter cartridge is installed vertically, the dust can easily fall and settle into the dust hopper when the filter is cleaned, so the effect is good.
When installed at an angle, the filter cartridges are stacked above and below each other, which is compact, covers a small area, and is easy to change cartridges. Still, when cleaning the dust, the dust from the upper cartridges settles on the lower cartridges and is difficult to remove.
If installed horizontally, the dust in the upper part of the lower cartridge is more challenging to remove.
Tilt installation of the cartridge dust collector is suitable for small and medium-sized dust removal systems, filtering non-viscous, intense concentration, coarse particles of dust, but also ideal for the transformation of some old bag dust collectors.
Comparison with baghouse dust collectors in the industrial dust collection system
- The filtering area increases 3-5 times. Filtering air speed decreases significantly.
- The dust removal rate is increased up to 99.99%.
- The length of the filter cartridge is short, and there is a larger excess space, which is conducive to dust settling.
- The filter life of the cartridge is longer.
- Venturi and cage are all dispensed.
- Short and few filter elements, easy to install (top loading), easy to maintain and replace.
A cartridge filter for cartridge type dust collector is an excellent choice for people who are looking for an effective way to reduce dust and other air contaminants in the workplace. Not only do they capture and retain airborne particles, but they are also easy to maintain and replace when needed.
