Questions regarding automatic cleaning filters

As provided by the original poster, an automatic filter is more than sufficient to meet the requirements. The control of waste discharge is handled by the differential pressure controller associated with the filter; with 3–6 KG of dry impurities present, backwashing is generally required every 2 days or so. It’s best to set the differential pressure so that waste discharge can be carried out automatically.

Thank you very much. :) I wonder if there’s a formula that can be used to estimate it roughly?

Generally, there is no specific formula for estimation. The specific filter medium parameters of the owner (physical properties, temperature, flow rate, etc.) are required to proceed with the design. The design of such filters falls under the category of custom-made equipment; the specific conditions vary from one factory to another, making it difficult to establish a uniform standard – only reference values can be provided. You can contact Prin Company (under Beijing Aerospace Petrochemical Engineering Company).

It’s better to address the issue at its source; identify points in the process where manual grids can be added to catch cotton fibers and other debris, thereby extending the lifespan of the filters. Automatic cleaning filters are expensive, and the cotton fibers and debris can get stuck to the brushes on these filters. During the cleaning process, it may not be possible to remove all of this debris, and it could even cause the motor of the automatic cleaning filter to overheat and get damaged.

I also think that automatic filtration isn’t very suitable; as mentioned above, substances like cotton fibers can easily clog the filter. I suggest using filter bags for filtration, as it’s a cost-effective option. If there are many impurities, a two-stage filtration system is advisable. When the particle size distribution is such that more than 50% of the particles are of a certain size, this approach is used – the first stage filters out larger impurities, while the second stage removes finer ones. This makes it less likely for the filter to get clogged. For applications that require continuous operation, a parallel setup with a valve in between could be considered. For more information, visit Flychao Filtration at www.feature-tec.com. If needed, our company can also help you collect liquid samples for analysis, conducting tests to determine the most suitable filtration method.

If the impurity particles are large, membrane filters commonly used for filtering suspended solids may not be effective (water consumption will be high, and it may not be possible to remove them). The poster could consider filters similar to water treatment resin traps, with a filter pore size that can be increased appropriately; if the substances to be filtered are heavier than water, a vertical design should be used, with a drain valve installed at the bottom. Two in parallel (one in use, one as backup). Block one, replace it with another. (The core can be designed in a structure that is easy to clean.) If it can be washed away with water, then, as mentioned on the 2nd floor, implement differential pressure control (set the pressure difference between the inlet and outlet by yourself, increasing it from low to high until an appropriate pressure difference is achieved). An outlet pressure can also be set depending on the circumstances). Control can be achieved using just two electrical contact pressure gauges, a time relay, an intermediate relay, and an electric or pneumatic valve, resulting in low costs. Personally, I don’t like cleaning tanks that use motors for rotation (mechanical failures are likely to occur).