Filter washing and drying three-in-one selection points

- Oct 06, 2018-

Such as filter washing and drying three-in-one such customized products, the most basic customer demand points in the selection, such as filtration speed, washing effect, drying efficiency and so on. Such requirements are often matched from the most basic aspects, and the quality of the equipment must not be neglected. The spindle seals mentioned above, the proper selection and the reasonable matching of other parts of the equipment can greatly improve the sealing performance, eliminate the pollution performance and the most important stable service life.


Equipment selection, all grades of stainless steel alloy materials can meet most production and use requirements. However, corrosive materials (extreme acid and alkali, high content of chloride ions, etc.) are inevitable in some productions. The selection of such conditions needs to be cautious. The trade-offs are generally based on three aspects:


The first [material corrosion resistance] general chloride ion content material, from normal to high temperature drying, titanium material has excellent corrosion resistance, 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;


The second [material manufacturing process] and titanium alloy excellent corrosion resistance stability is also known as 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 research and development of such applications, forming a set of "composite titanium processing" process, on the basis of various alloys, composite titanium for equipment processing, the first successful application of titanium Has accumulated 16 years of craft experience.


The processing of precious metals such as Hastelloy is similar 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. For the coating of slightly complicated structures, the adaptability and stability of the process are greatly reduced.


Third [life, performance and stability] Under the premise of authentic materials, the equipment manufacturing process is the most critical factor in determining the service life and stability of the 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 transfer 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, separating the drying process alone is a recommended solution;


However, it is worth noting that non-metallic materials have some drawbacks in the selection of filter media. Generally, metal filter media will not be applicable. Non-metal filter media must use a dielectric protection structure. This configuration is a porous structure, whether pure or not. Non-metallic materials (poor strength) or coating process (complex structure coating process is difficult, stability is not ideal) have the problem of high maintenance costs in the later period (usually a few months of service life, coating repair effect is not ideal).


In summary, the balance considerations of the three aspects can also be attributed to the most cost-effective issue of customer selection. The high-quality equipment obtained from the durable materials with high-precision machining process will bring predictable feedback to customers in the later stages: The equipment runs stably and has a long service life (the longest use of Dingchang customer feedback has been for 10 years), low maintenance cost, high process efficiency, energy-saving energy, increased output, high product purity and quality improvement.