Chemical process pump types and mechanical development present situation
Chemical process pump is the floorboard of chemical production process all sorts of pumps. Chemical process pump breed is many, according to their function principle can be divided into vane pump, such as centrifugal pump, axial pump, mixed pump, division shunt pump, vortex pumps, etc; Displacement pumps, such as reciprocating pump (including piston pumps and piston pumps, diaphragm pumps, etc.), Rotary pump (including screw pump, liquid ring pump gear pump, sliding-vane pump, Roots pump, radial piston pumps, etc.), Other types pumps, such as injecting pump, electromagnetic pump, water hammer pumps, etc. According to production process or product characteristic, can be divided into high-pressure armour amine pump, cryogenic pumps, phosphoric acid pulp pumps, etc.
In chemical or petrochemical production, pump in high temperature, low temperature (or ultra-low temperature), and high pressure, inflammable, explosive, toxic, corrosive medium still work, some works under high inlet pressure, high head, high viscosity, small flow, high cavitation conditions, proposed quite stringent requirements to chemical pump performance, especially for corrosion resistance, not allowed to leak (toxic medium) and highly demanding of wear resistance. In order to adapt to the chemical production special requirements, in chemical industry also specialized in the production of special chemical pump, such as plastic pump, glass pump, ceramic pump, graphite pump, canned motor pump, magnetic pump, impurities pumps, etc
Phosphate production process needs transmission medium basically has phosphate ore pulp, phosphate pulp, various filtrate, concentrated phosphoric acid dilute sulfuric acid, phosphoric acid, dilute sulphuric acid and fluorine silicate, pump is easy medium corrosion or corrosion and erosion wear. Phosphoric acid pulp pump is phosphate production process, is the general term of various pump is representative of the strong corrosive resistance and wear resistance pump. In the early development of phosphate fertilizer industry, the commonly used chemical corrosion resistant pump, some life only one week, therefore the domestic and foreign pump industry experts in phosphoric acid pulp pump structure design, material experiment, sealing research and other aspects massive development research. In phosphoric acid pulp pump design, the first to solve the corrosion or corrosion and erosion wear problem. Therefore, the structure design and pump impeller and shell match should be special considered. Foreign phosphate pulp pump used metal materials, according to media status adopt different series. Domestic manufacturers and research units are respectively research various materials corrosion resistance and wear resistance performance, create their own ferritic stainless steel, duplex steel, austenitic stainless steel series. The domestic many phosphate pulp pump specialized factory, simultaneously also has the design institute, Chinese academy of sciences, universities, scientific research, development, participate in research institute of phosphoric acid pulp pump localization is now basically resolved.
Domestic currently has been built large, medium and small compound phosphate fertilizer production project, large and medium-sized device has all kinds of pulp pump 30 ~ 40 sets, medium and small device almost has all kinds of pulp pump 20 ~ 30 sets, according to each pump life of expectancy six months to count, market space is bigger. In addition, there are some big domestic phosphate production enterprise newly built or infrastructure was still underway, plus a batch of medium and small expansion project, ammonium phosphate pumps for domestic provide a broad market space.
