Coalescing filters remove liquid contaminants from compressed air and gas processes. They must be preceded by a general-purpose filter to prevent them from clogging too quickly.
These filters typically have a lower initial pressure drop and work at higher flow rates than particulate filters. They also have a faster response time and require less space for installation.
Difference
The main difference between oil separator filters and coalescing filters is that the latter removes liquid droplets from gas streams. Coalescing filter elements use multiple layers of fibers to capture the oil mist and combine it into larger drops that are susceptible to gravity and flow down into the sump at the bottom of the element.
These droplets are then either collected in a drain system or picked up by the scavenger line and returned back to the compressor package for recirculation. Oil scavenging is an important function that improves compressor performance and reduces the risk of contaminant buildup in the compressed air system.
While sizing an oil coalescing filter, you must consider factors like system pressure, flow rates, type of contaminants to remove, and dirt holding capacity. Also, you should take into account the fixed and incremental pressure drop across the coalescing filter element. Fixed pressure loss results from the new housing and element, and incremental pressure drop comes from a dirty filter element that has to work harder to overcome the drag force of the liquid droplets.
Comparison
Coalescing filters remove liquid contaminants and gas particles from compressed air. They function by screening based on the differences between substances’ molecular weights and density. In water-oil separation, baffle walls in the coalescing filter divert heavier oil molecules to a drain point while allowing lighter water vapor to pass through the element. The resulting vapor and water droplets then coalesce into large drops that get drained by gravity.
Coalescent filter elements can be hydrophilic or oleophilic, depending on your application’s needs. If you choose to use a hydrophilic material, it will speed up the amalgamation of the tiny droplets and improve draining values.
It is important to select the right housing for your coalescing filter element. It must be made of a material that can withstand system pressure and flow rate. It should also be chemically compatible with the contaminants it will be removing. This ensures that the filter can perform effectively and efficiently for a long time.
Functions
Unlike oil separator filters, coalescing filters do not use the separation process to remove oil. This type of filter uses the process of coalescence to eliminate contaminating liquid aerosols from air and gas streams. This is done by combining smaller drops into larger ones. As a result, the heavier droplets are pulled down and drain away from the system. This type of filter is sized to determine the system pressure, flow rates, and types and quantities of contaminants to be removed. It also includes a partitioned inlet to prevent solid particles from entering the filtration unit.
It also has multiple layers of fibrous materials to trap liquid droplets and mist. As the droplets combine, they become big enough to be susceptible to gravity and fall into an extraction chamber at the bottom of the filter. This enables you to easily extract these drops from the gas stream and eliminate them from the system. This is important because it reduces the risk of contaminating other parts of the system and improves drainage values.
Choosing the Right Compressed Air Filter
Air compressor filters must be able to remove both liquid droplets and aerosol particles. They must also be able to handle vapors, gases and odors. Coalescing filter elements work by making small drops of oil and water stick together (coalesce) to form larger drops that are heavy enough to fall to the bottom of the filter where they are drained away.
Air filters come in a variety of phu tung may nen khi sizes and degrees of filtration. It is important to select the right filter for your business needs.
Choosing the wrong air filter can cause serious problems for your business. The wrong kind of filter will not remove the contaminants you need it to and will lead to a costly waste of energy. For example, using a charcoal filter to remove odors and gases can cause the oil to oversaturate the filter and wear it out in a short time. This will require the system to be shut down to change the filter.
