1.φ870 circulation pump deficiencies Yingcheng Salt Mine in Hubei Province is a large salt companies, a total of three sets of salt equipment. Among them, a group is the annual output of 200,000 t imported Switzerland (SULZER) salt and nitrate co-production equipment, the other two groups with an annual output of 150,000 t of the old equipment. Circulating pump is outside the heating vacuum salt system key equipment, its performance, quality and operating conditions directly related to the production of crude salt production, quality. Running in the introduction of the production line circulation pump, reliable quality, excellent performance, strong corrosion resistance, lightweight modeling, low energy consumption, small maintenance, long cycle intervals, low maintenance costs. The φ870 circulating pump running on the other two old domestic lines has unstable performance, poor corrosion resistance, bulky shape and large energy consumption, especially the short maintenance period, large amount of maintenance, and high maintenance cost. Every 100 days on average The impeller must be changed once in a while, often causing the shutdown, resulting in a series of problems such as low output and poor efficiency. To solve these problems, we must digest and absorb the introduction of equipment, development and production of new and efficient circulating pump to make up for the lack of the old circulating pump. To this end, we introduced the circulation pump in 1990, localization, developed a QL800-1 circulating pump, instead of φ870 circulating pump, received a great deal of economic benefits. 2.QL800-1 circulating pump structural characteristics QL800-1 circulating pump design, we fully consider the actual situation of domestic salt equipment, carefully absorb the essence of the introduction of equipment. First in the design, the use of new technologies. In order to meet the needs of different types of evaporation cans, the circulation pump speed, power, head, flow and other major parameters made the appropriate changes. The design speed from the original 420r / min increased to 450r / min, 460r / min, 465r / min three levels. Head raised from the original 2.2m to 2.7m, 2.9m, 3.0m three levels. Flow from the original 6800m3 / h to 7500m3 / h, 9000m3 / h, 9500m3 / h three levels, supporting motor power from the original 110kW to 132kW, 160kW, 180kW three levels. The digestion and absorption of the QL800-1 circulating pump production capacity than the introduction of circulating pump increased by 20% to 50%. In the structure and φ870 circulating pump, with light weight, small size. The weight of only φ870 circulating pump 1/4, only 1/3 its volume, using a cantilevered structure, reducing a set of seals, reducing a set of bearings. The use of suspended installation, to solve the problem of thermal expansion stress compensation, neither the basic equipment, nor the expansion of compensation section. Pulley and shaft coupling, the new tapered sleeve structure, easy to disassemble, large pulley for axial adjustment, installation or maintenance, you can easily disassemble the size pulley. Bearing box increased storage space, the total amount of oil is 15kg, can guarantee a year without changing the lubricating oil. The overall casting box, good strength, beautiful appearance. Double-packing with a sealed structure, the use of two sealed water, fresh water from the sealing effect, the brine from the isolation. Double seal structure can effectively prevent fresh water into the brine layer, to avoid the evaporation efficiency is affected, but also when replacing the filler, do not need to rule out the tank of the mother liquor. In the material selection on the use of new materials. The introduction of circulating pump is Monel alloy material, we design QL800-1 circulating pump selection, taking into account the actual situation of the vast majority of manufacturers in the salt industry in the current financial situation, to give up the high price of Monel alloy, and All parts of the media contact with the right price, good corrosion resistance 316L stainless steel. The long-term by the Salt Mine in Na2SO4 brine environment, the use of 316L stainless steel material is very suitable, superior to other stainless steel materials. Size pulley with rare earth ductile iron casting, both for easy processing, but also to make the pulley with steel performance strength. The transmission uses a high-strength, narrow V-belt and the belt model is reduced by two levels, reducing the pulley weight by half. Sealed with a new double PTFE packing, compared with the sealing materials used in the past, longer service life, more convenient maintenance. Bearings using a single row radial ball bearings, this bearing has the ability to withstand greater axial load and radial load. Therefore, long service life, low operating temperature, without cooling water, easy to adjust the gap. Ah efficient motor selection of full-sealed motor, usually very simple to maintain, to overcome the past shutdown, the need to power baking motor problems. In the production, using a new technology. The first is that we have the advantage of casting ability, the impeller and impeller hub using 316L stainless steel precision casting, to ensure accurate geometric shape, the process of ensuring accuracy and balance of movement to meet the requirements of the impeller and impeller hub both wear-resistant corrosion-resistant, Smooth operation. The second is the flange to eliminate the previous splicing and lining technology, the use of straight stainless steel straight blanking, roll forming process, less welded joints, anti-corrosion ability. The third is blanking plasma cutting process, welding using arc welding and argon arc welding methods, both to maintain the stability of the material properties, but also increased the appearance of beautiful. 3. Application Introduction In January 1995, a QL800-1 circulation pump was installed on the â… effect of a group of homemade equipment of Yingcheng Salt Mine. After 6 months of use, all the performances meet the design requirements, which can meet the requirements of long-term safety and high efficiency Need for operation Therefore, in June 1995 again in this group â…¡ â…¢ â…£ effect on the replacement of three QL800-1 circulating pump. After a year of use proved that the pump is easy to install, start flexible, smooth operation, no plugging phenomenon, salt production, quality has been effectively improved, there is almost no maintenance. Opened a few months after the opening manhole inspection, did not find potential corrosion and stress cracks and other issues, the impeller and internal clean as new, greatly saving costs and improve economic efficiency. In view of the good condition of QL800-1 circulation pump after its use in a group of domestic production lines of our mine, Yingcheng Salt Mine decided to phase out the four φ870 circulating pumps on another group of domestic-made old lines in July 1996, all Replaced by QL800-1 circulation pump, so that digestion and absorption equipment in mine production of salt play a greater role. At this point, Yingcheng Salt Mine two sets of domestic production lines have all been installed using the QL800-1 circulating pump. Currently, QL800-1 circulating pump is operating normally.
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