Chemical process pump is a general term for various pumps in the chemical production process. There are many types of chemical process pumps, which can be divided into vane pumps according to their function principle, such as centrifugal pumps, axial flow pumps, mixed flow pumps, partial flow pumps, vortex pumps, etc. Positive displacement pumps such as reciprocating pumps Pump, diaphragm pump, etc.), rotary pump (including screw pump, liquid ring pump gear pump, vane pump, Roots pump, radial piston pump, etc.); other types of pumps, such as jet pump, electromagnetic pump, Wait. According to the production process or product characteristics, can be divided into high-pressure methylamine pump, cryogenic pump, phosphor slurry pump. In chemical or petrochemical production, the pump is working under high temperature, low temperature (or ultra-low temperature), high pressure, flammable, explosive and toxic corrosive media, and some are still under high inlet pressure, high lift, high viscosity, low flow, High cavitation conditions, the performance of the chemical pump made quite demanding requirements, especially for corrosion resistance, leakage is not allowed (for toxic media) and wear resistance demanding. In order to meet the special requirements of chemical production, the chemical industry also specializes in the production of chemical pumps, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shielded pumps, magnetic pumps and impurity pumps. The main media that need to be transported in the process of phosphate fertilizer production are phosphate slurry, phosphate slurry, various filtrates, concentrated phosphoric acid, phosphoric acid, concentrated sulfuric acid, dilute sulfuric acid and fluorosilicic acid. The pump is highly susceptible to medium corrosion or erosion and erosion. Phosphoric acid slurry pump is a generic term for all kinds of pumps in the production process of phosphate fertilizer and is a very representative type of pump resistant to strong corrosion and abrasion. In the early stage of development of phosphate fertilizer industry, commonly used chemical corrosion-resistant pump, and some life expectancy is only one week, so the pump industry experts at home and abroad in the phosphate slurry pump structure design, material testing, sealing research conducted a lot of research and development. In the phosphor slurry pump design, the first thing to be solved is corrosion or corrosion and erosion problems. Therefore, special consideration should be given to the structural design and the matching between the pump housing and impeller. Foreign phosphoric acid slurry pump used in metal materials, is based on the media using different series. Domestic manufacturers and research institutes also conducted research on the corrosion performance and wear resistance of various materials to create their own ferritic stainless steel, dual-phase steel, austenitic stainless steel and other materials. Many domestic phosphate slurry pump professional manufacturer, but also the Chinese Academy of Sciences, universities, design institutes, research institutes involved in scientific research and development, phosphoric acid slurry pump localization problem has been basically solved. Among the large, medium and small-sized phosphate compound fertilizer production projects in China, there are about 30 to 40 slurry pumps for large and medium-sized plants, 20 to 30 slurry pumps for medium and small-sized plants, The average life expectancy of each pump 6 months, the market space is relatively large. In addition, there are still some large-scale phosphate fertilizer production companies in China that have just completed their construction or are still under construction. Coupled with a number of small and medium-sized ammonium phosphate expansion and expansion projects, they provide a vast market for domestic phosphate fertilizer pumps. High-pressure methylamine pump and high-pressure liquid ammonia pump is urea plant suffered strong corrosion, the most technically difficult pump. Reciprocating plunger structure is often used in medium and small urea plants. Multistage centrifugal and high-speed partial flow are often used in large urea plants. In recent years, reciprocating structure pumps have also emerged. Reciprocating pump unit volume, complex structure, repair inconvenient, prone to fatigue cracking of the pump body, but more reliable operation, higher efficiency. High-speed part of the flow pump with two radial impeller, speed up to 14,000 more rev / min, compact structure, operation is relatively stable, but the sealing and wear problems more prominent, not easy to solve. Multistage centrifugal pump is between the two, its manufacturing is relatively low difficulty, the sealing structure is better, and more reliable. The three types of high-pressure methylamine pump have been developed domestically, in the manufacture and use of less serious problems, but the current product is still mainly rely on imports. At present, China has been able to develop and produce various types of pumps, so the problem is not technology, and in the market. There are generally two kinds of equipment that can not be manufactured domestically: one is the patented equipment, which is manufactured by a specialized manufacturer in a foreign country. The patented technology developed in China is not technically worth the effort. The other is the insufficient quantities, mostly single machines and domestic ones. Profitably For the above two cases, it is generally recommended that users introduce foreign products. Some domestic equipment in the price is very advantageous, especially in spare parts prices and timeliness more advantages, the price ratio has become the main basis for the user to choose to introduce or domestic equipment. In general, the price of domestic pump equipment is only 50% of the imported equipment of the same kind, while the price difference of spare parts is larger. There are also some users who do not understand or prejudice domestically produced equipment and do not analyze it in a concrete way. They subjectively think that foreign equipment is advanced, reliable and blindly introduced, which is an undue obstacle in the process of equipment localization.
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