Types and Development Status of Mechanical and Chemical Process Pumps

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Chemical process pump is the general name of various pumps in the chemical production process. There are many kinds of chemical process pumps, which can be divided into vane pumps according to their working principles, such as centrifugal pumps, axial flow pumps, mixed flow pumps, partial flow pumps, vortex pumps, etc. Positive displacement pumps, such as reciprocating pumps (including plunger pumps, piston pumps, diaphragm pumps, etc.); Rotary pumps (including screw pumps, liquid ring pump gear pumps, sliding vane pumps, Roots pumps, radial piston pumps, etc.); Other types of pumps, such as injection pumps, such as hammer pumps. According to the production process or product characteristics, it can be divided into high-pressure methylamine pump, cryogenic pump, phosphoric acid slurry pump, etc.

In chemical or petrochemical production, pumps work under high temperature, low temperature (or ultra-low temperature), high pressure, flammable, explosive, toxic and strong corrosive media, and some work under high inlet pressure, high lift, high viscosity, small flow and high cavitation conditions, which puts forward quite strict requirements for the performance of chemical pumps, especially for corrosion resistance, no leakage (for toxic media) and wear resistance. In order to meet the special requirements of chemical production, the chemical industry also specializes in the production of special chemical pumps, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shield pumps, magnetic pumps, impurity pumps, etc. The medium to be transported in the process of phosphate fertilizer production mainly includes phosphate ore slurry, phosphoric acid slurry, various filtrate, concentrated phosphoric acid, concentrated sulfuric acid, dilute sulfuric acid and fluosilicic acid, etc. The pump is extremely vulnerable to medium corrosion or corrosion and erosion wear.

Phosphoric acid slurry pump is a general term for various pumps in the production process of phosphate fertilizer, and it is a very representative type of strong corrosion and wear resistant pumps. In the early stage of the development of phosphate fertilizer industry, some of the commonly used chemical corrosion-resistant pumps have a life span of only one week. Therefore, experts in the pump industry at home and abroad have carried out a lot of research and development on the structural design, material testing and sealing research of phosphoric acid slurry pump. In the design of phosphoric acid slurry pump, the first thing to be solved is corrosion resistance or corrosion and erosion wear. Therefore, special consideration should be given to the structural design and the matching between the pump casing and the impeller. The metal materials used in foreign phosphoric acid slurry pumps are different series according to the conditions of the medium. Domestic manufacturers and research units have also studied the corrosion and wear resistance of various materials, creating their own series of ferritic stainless steel, duplex steel, austenitic stainless steel and other materials. There are many professional manufacturers of phosphoric acid slurry pumps in China, and at the same time, Chinese Academy of Sciences, universities, design institutes, research institutes, etc. participate in scientific research and development. The localization of phosphoric acid slurry pumps has been basically solved.

In the large, medium and small phosphate compound fertilizer production projects that have been built in China, there are about 30 to 40 large and medium-sized devices for various slurry pumps, and 20 to 30 small and medium-sized devices for various slurry pumps. According to the average life of each pump, the market space is relatively large. In addition, there are still some large phosphate fertilizer production enterprises in China that have just been completed or infrastructure construction is still in progress. In addition, a number of medium and small ammonium phosphate reconstruction and expansion projects have provided a broad market space for domestic phosphate fertilizer pumps.

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