At present, in domestic and foreign equipment, the main parts are made of stainless steel, especially the drum and spiral parts are all made of stainless steel. Only a few foreign manufacturers can use suitable materials for different treatment objects and media requirements, such as municipal sewage treatment And in non-corrosive occasions, the use of high-strength carbon steel anti-corrosion avoids excessive design and greatly reduces manufacturing costs. Through more than ten years of practice, it has been proved that it is completely feasible to use carbon steel anti-corrosion materials in municipal sewage treatment.
The so-called high-drying (efficiency) model is more commonly used in foreign countries, and it is commonly used in China as a concentrated dehydration integrated machine. It can dehydrate the unconcentrated sludge directly, and can usually process municipal and industrial sludge with solid content of about 0.4 to 0.8%.
At present, only some domestic manufacturers have this technology. The technology mainly comes from the technical cooperation and introduction with foreign companies. Only a few manufacturers are innovative technologies that have absorbed and improved foreign technologies, but they are different. A small number of companies have absorbed Alfa Laval's BD baffle technology, or other companies' squeeze screw design, that is, a special baffle is set at the spiral discharge end of the centrifuge cone section, or BD baffle, or Increasing the spiral design of the cone section (inner cone) can make the centrifuge in the state of an ultra-deep liquid pool, make the liquid level in the pool run above the solid discharge surface, and reduce the volume of the sludge space in the cone section and increase The pressure on the mud cake, and only the lower sediment is transported, and the sludge with high water content in the upper part is trapped outside the press cone section to achieve press dehydration (similar to a screw press dehydrator) to make the sludge more dry.
The spiral blade of the screw conveyor is designed in the form of a gradual pitch change, the pitch gradually decreases from the large end to the small end of the drum, so that the sediment is compressed by the radial centrifugal force during transportation, and it is also subjected to the axial two-way squeezing , To produce squeezing force along the axial direction. As a result, the capillary pores of the sediment are reduced, and the moisture contained is discharged outward, thereby reducing the moisture content of the sediment.
Another design is to provide a press plate with an Archimedes spiral cross section on the spiral cylinder. When the sludge is pushed from the spiral cylindrical section to the cone section, the spiral press plate gradually compresses the sludge. Since the press plate and the drum body form a wedge-shaped channel, the slag pressing pressure gradually increases, reaching the maximum at the outlet, and the filtrate is discharged from the wider direction along the tangential direction of the wedge gap.
In addition to the above two, the high-dry design of foreign centrifuges, recently, Swedish NOXON (NOXON) company launched a new patented technology, called Lamella technology, that is, using the principle of inclined plate precipitation, the centrifuge screw push The blades are designed to be inclined, and the blade inclination angle, pitch, blade spacing and other parameters have been optimized to achieve the best treatment effect. The solid settling time is shortened by several times, and the disturbance of the spiral pushing blade to the clarifying liquid pool is greatly reduced. The consumption of flocculant is 30% to 40% lower than that of the ordinary centrifuge, and the processing capacity is increased by 40%. Especially suitable for processing some ultra-fine or gel-like solids. The lowest feed concentration currently processed can reach 0.2%.
China's decanter centrifuge industry started late, but some manufacturers have reached international advanced levels in certain technologies and performances, and even exceeded some foreign brand centrifuges in certain special technologies. However, from the overall view of China's centrifuge manufacturing industry, it is undeniable that the overall level of China's centrifuge manufacturing industry and foreign centrifuge manufacturing, new technology research and development, especially in the reliability, stability, service life, assembly accuracy of the whole machine , The flexibility of operation, humanization, and the application of certain new technologies (mainly the application of new concepts) and other aspects, there are still certain gaps. It is suggested that the domestic centrifuge manufacturer can consider design and improvement from various aspects, so that the new technology application and production technology of the decanter centrifuge in China can be further improved.
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