Filter washing and drying three-in-one selection points

- Apr 18, 2019-

Such as filter washing and drying three-in-one such customized products, the most basic customer needs in the selection, such as filtration speed, washing effect, drying efficiency and so on. Such requirements are often matched from the most basic aspects. The quality of the equipment must not be neglected. Repeating the above mentioned mechanical seal spindle, and a suitable selection of equipment reasonable match the other sealing portion can dramatically increase performance, to prevent contamination of the most important properties and stable life.


Equipment selection, various grades of stainless steel alloys to meet most requirements of the production. But the strong corrosive materials (extreme pH, high levels of chloride ion, etc.) in the production of some inevitable selection of such cases would need to be more cautious, weigh the considerations set out general three aspects:

1. [Material corrosion resistance] General chloride ion content materials, from normal to high temperature drying, titanium material has excellent corrosion resistance, and even stable to hydrochloric acid with a concentration below 1%; high concentration hydrochloric acid, hydrofluoride Has strong corrosion solution such as acid, Hastelloy is the preferred material for mature application in the market; non-metallic materials such as PTFE, etc., the corrosion resistance is also relatively stable, but it is easy to cause coating peeling and other problems during the application of the device. The third point will be elaborated;

2. The difficulty of its processing technology, titanium material is special, the typical problem is that it can not be directly welded with other materials; but from the application cost consideration, pure titanium material is not accepted, Dingchang for such applications for process development, Formed a set of "composite titanium processing" process program, based on a variety of alloys on the composite titanium material for the overall processing of equipment, from the successful application of titanium for the first time has accumulated 16 years of process experience. The processing of precious metals such as Hastelloy is close to that of stainless steel alloys, but in the processing of complex structures, the control of details is crucial, such as the screw-type stirring for the temperature-controlled medium, the mature processing technology in the equipment. The service life and stability can be reflected above (if the processing technology is not mature, the stirring may cause leakage and excessive deflection when the equipment is used for less than one year). The processing of non-metallic coating materials is widely used in the reactor industry. Coatings for slightly complex structures have greatly reduced the adaptability and stability of the process.

3. [Lifetime, performance and stability] Under the premise of ensuring authentic materials, the equipment manufacturing process is the most critical factor in determining the service life and stability of the later equipment. The heat transfer effect of metal materials is similar, which is the preferred material in the heat exchange process; and even when different temperatures are used alternately, even different alloy materials have close shrinkage ratios, which are generally stable. The coating type equipment firstly affects the heat exchange effect and greatly reduces the drying effect; furthermore, due to the large difference between the thermal expansion and contraction properties of the base material and the coating material, the coating is easily peeled off during the alternating use of hot and cold, And the repair effect of post-repair work is not ideal; in the case of having to choose non-metallic materials, it is recommended to separate the drying process alone; but it is worth noting that non-metallic materials have some choices in filter media. Disadvantages, general metal filter media will not be applicable, non-metal filter media must use media protection structure, this configuration is porous structure, whether it is pure non-metallic material (poor strength) or coating process (complex structure coating process difficulty Large, unsatisfactory stability) has the problem of high maintenance costs in the later period (the service life is generally several months, the coating repair effect is not satisfactory).


In summary, the balance considerations of the three aspects can also be attributed to the most cost-effective problem of customer selection. The high-quality equipment obtained by the high-precision machining process of durable materials will bring predictable feedback to customers in the later stages: Stable operation and long service life (Dingchang customer feedback has been used for up to 10 years), low maintenance cost; high process efficiency, energy saving, increased output; high product purity, quality improvement, etc.