Introduction and application of filter aid filtration system

First, the basis of filter filtration purification principle

1 meaning of filtering

If the traditional filtration method improves the filtration precision, the flow rate is too small, and it is easy to block. Frequent slag backwashing not only makes the production impossible, but also seriously affects the production efficiency, and also causes waste and pollution. If the accuracy is not enough or not stable, it will affect the quality, and will increase the burden on the subsequent process, even causing a large consumption of macroporous resin or film, and the filtrate loss of the conventional filtration process, so that the production cost is greatly increased.

Shenyang Wuheng Industrial Co., Ltd. specially developed the ultrafiltration filter equipment for extracting liquid dynamic filtration, which combines the advanced filter aid theory with the advanced mechanical design and manufacturing process to solve the filtration process problem that has been plaguing the extraction liquid production industry for a long time. It provides an advanced and efficient filtration process for extract production.

2 filter filter principle

In the filtration process, the filter aid is used as the actual filter medium instead of the filter element and the like, and the filter aid has a high void ratio (ε>0.7) and a low compression ratio (compression index n<0.3). The dynamic addition of the filter allows the filter layer to be adjusted from time to time, avoiding the formation of the coating layer on the surface of the filter layer. By dynamically adding a filter aid in the stock solution, a filter aid is used to form a coating (ie, a filter aid layer). Filtration, as the filtration proceeds, the impurities in the raw liquid are overhead on the filter layer, so that while the filtration is being carried out, a new filter aid layer is continuously formed, thereby ensuring constant permeability, high precision and stable large Flow rate, greatly extending the continuous working time, so that continuous high-precision filtration of solid particles.

Second, the scope of application

It can be installed in other filters with low filtration accuracy (such as plate and frame filter press, centrifuge, vane filter, drum filter, etc.) for precision re-filtration. It is suitable for membrane pre-treatment of membrane separation technology and macroporous resin adsorption technology to reduce costs.

Third, technical characteristics

Constant Accuracy: Most of the filter layers of traditional filtration equipment are vertical structures. It is difficult to balance the liquid pressure to support the filter cake. Under the action of gravity, the filter cake falls off and causes filtration, resulting in lower precision. The dynamic filter filter system horizontal layer structure, the filter cake is directly supported by gravity, supplemented by the full precision liquid flow design to ensure stable high precision throughout the process (optional filtration of solid particles of nominal diameter 0.5μm ~ 5μm) ).

Constant flow rate: adopts the advanced filter-assisted filtration principle, the filter aid is dynamically added with the equal proportion of the filtrate, so that the construction of the filter layer is dynamically adjusted, and sufficient permeability is maintained at all times to ensure continuous and stable large flow rate. Greatly improve production efficiency;

Long filtration period : Because of the dynamic filter-assisted filtration principle, there is no filter element and other components. The filter aid captures various impurities in the overhead, avoids the formation of the paint-like blocking layer, and the flow attenuation is extremely slow, which greatly prolongs the continuous working time. Therefore, in ensuring high precision, large flow conditions greatly extend the filtration cycle;

No backwashing and no tailings: Traditional filtering equipment usually requires liquid backwashing, which requires a large amount of cleaning fluid to be vented or recirculated to the system, and the remaining tail liquid in the chamber's cavity must also be drained or recirculated. Inevitably increase operating costs and labor intensity and cause environmental pollution. Wuheng's filter-filter system slag cake is dried and discharged without washing or tail liquid discharge.

Unique sealing : the filter main unit is open structure, there is no seal between the filter plates, and the patented dynamic sealing technology is used to completely eliminate the capillary phenomenon without any leakage, avoiding waste of filtrate and pollution of the working environment.

No loss: no leakage of the whole system, no need for backwashing, no residue of filtrate, dry discharge of filter residue, so there is no loss of filtrate throughout the process;

Simplification: the entire system can be operated automatically, saving labor and improving efficiency;

Long maintenance-free life: The mainframe is a fully rigid structure with no wearing parts and no maintenance. All parts are heat treated twice, no deformation during use, and the service life is more than 20 years.

Environmental protection burden: There is no liquid leakage during the work process, and the filter residue is dried and discharged, which is conducive to environmental protection.

In summary, the filter-filter system changes the traditional liquid purification ideas, overcomes the drawbacks of the traditional technology, and makes the advantages of the filter-filter technology well reflected in the liquid ultra-fine purification.