Mechanical Chemical Process Pump Classification and Development Status

Chemical process pumps are the general term for various pumps in the chemical production process. There are many varieties of chemical process pumps. According to their principle, they can be divided into vane pumps, such as centrifugal pumps, axial pumps, mixed-flow pumps, partial-flow pumps, vortex pumps, etc. Positive displacement pumps, such as reciprocating pumps (including piston pumps, pistons) Pumps, diaphragm pumps, etc.); Swing pumps (including screw pumps, liquid ring pump gear pumps, vane pumps, Roots pumps, radial piston pumps, etc.); other types of pumps, such as jet pumps, electromagnetic pumps, water hammer pumps Wait. According to the production process or product features, it can be divided into high-pressure methylamine pump, cryogenic pump, phosphoric acid slurry pump and so on.

In chemical or petrochemical production, the pump works under high temperature, low temperature (or ultra-low temperature), high pressure, flammable, explosive, toxic and corrosive media, and some are still at high inlet pressure, high lift, high viscosity, small flow, Working under high cavitation conditions places very stringent requirements on the performance of the chemical pump, especially with respect to corrosion resistance, non-permissible leakage (for toxic media) and abrasion resistance. In order to meet the special requirements of chemical production, the chemical industry also specializes in the production of chemical-specific pumps, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, canned pumps, magnetic pumps, and impurity pumps.

Phosphorus fertilizer production process requires the transmission of the medium are mainly phosphate slurry, phosphoric acid slurry, various filtrates, concentrated phosphoric acid dilute phosphoric acid, concentrated sulfuric acid, dilute sulfuric acid and fluorosilicic acid, etc., the pump is susceptible to corrosion or erosion of the media and erosion wear. Phosphoric acid slurry pump is a general term for various pumps in the production of phosphate fertilizers, and it is a representative type of pump that is resistant to corrosion and wear. In the early stage of the development of the phosphate fertilizer industry, some commonly used chemical corrosion-resistant pumps had a life span of only one week. Therefore, experts at home and abroad have conducted extensive research and development on the structure design, material testing, and seal research of the phosphor slurry pump. In the design of a phosphoric acid slurry pump, the first problem to be solved is corrosion resistance or corrosion and erosion. Therefore, special consideration should be given to the structural design and the matching between the pump casing and the impeller. The foreign metal materials used in the phosphoric acid slurry pump are based on different media conditions. Domestic manufacturers and research institutes also conducted research on corrosion resistance and wear resistance of various materials to create their own ferritic stainless steel, dual phase steels, and austenitic stainless steels. There are many professional manufacturers of phosphoric acid slurry pumps in China, as well as Chinese Academy of Sciences, universities, design institutes, and research institutes that are involved in scientific research and development. The localization of phosphate slurry pumps has now been basically solved.

In the large, medium and small-sized phosphorus compound fertilizer production projects that have been completed in China, there are about 30 to 40 slurry pumps for large and medium-sized plants, and about 20 to 30 slurry pumps for medium and small-sized plants. With an average life of six months per pump, the market space is relatively large. In addition, there are still some large-scale phosphate fertilizer production companies have just completed or infrastructure is still in progress, coupled with a number of small and medium-sized ammonium phosphate expansion and expansion projects for the domestic phosphate fertilizer pump provides a broad market space.