1. Overview of chemical process pumps
There are many types 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, etc.) pumps, diaphragm pumps, etc.); rotary pumps (including screw pumps, liquid ring pumps, gear pumps, sliding vane pumps, Roots pumps, radial piston pumps, etc.); other types of pumps, such as production process or product characteristics, can be divided into It is high pressure methylamine pump, cryogenic pump, phosphoric acid slurry pump, etc. In chemical or petrochemical production, pumps operate under high temperature, low temperature (or ultra-low temperature), high pressure, flammable, explosive, toxic and strong corrosive media, and some still have high inlet pressure, high lift, high viscosity, small flow, Working under high cavitation conditions puts forward very 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, chemical special pumps are also produced in the chemical machine work, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shielded pumps, magnetic pumps, impurity pumps, etc. The media that need to be transported in the process of phosphate fertilizer production mainly include 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 easily corroded by the medium or corroded and washed away.
Second, chemical process pump operation requirements
In chemical or petrochemical production, pumps operate under high temperature, low temperature or ultra-low temperature, high pressure, flammable, explosive, toxic and strong corrosive media. Working under the conditions of small flow and high cavitation, the performance of the chemical pump has very strict requirements, especially for corrosion resistance, leakage and wear resistance. In the work, we also specialize in the production of special chemical pumps, such as plastic pumps, glass pumps, ceramic pumps, graphite pumps, shielded pumps, magnetic pumps, impurity pumps, etc.
3. Working conditions of chemical process pump
It is suitable for conveying neutral or corrosive, clean or liquid medium containing solid particles, low temperature or high temperature.
Working pressure: higher 2.5Mpa;
Working medium temperature: -70℃-180℃;
Maximum flow: 2000m3/h; higher lift: 160m;
Speed: 1450r/min and 2900r/min;
Matching motor maximum power: 315Kw.
Fourth, the benefits of chemical process pumps
1. The impeller can be closed, semi-open and open. It can transport clean, particle-containing, and a small amount of gaseous media. It can also transport high temperature, low temperature and strong corrosive media. The impeller is equipped with a balance hole and an anti-corrosion ring to balance the axial force.
2. The pump body and the bearing frame are connected by the central connecting section. According to different working conditions, different materials can be used for the central connecting section to avoid serious corrosion of the bearing frame and bearing when transporting strong corrosive media. A water-cooling cavity is arranged in the central connecting section, and the circulating water is cooled to block the high-temperature medium and transmit the high temperature to the bearing.
3. The sealing method can choose packing seal, single or double-end mechanical seal, and cartridge type single-end mechanical seal. According to different conditions and the user's requirements for cooling and flushing, the seal can be selected from the case according to the API682 design specification.
4. There are three methods for bearing erection: air-cooled heat sink, air-cooled fan, and water-cooled cavity. Users can choose according to the operating conditions. The bearings are lubricated by the oil ring splashing thin oil from the oil tank. The oil in the oil tank is cooled by the water in the water cooling chamber, and the heat in the bearing is taken away by the cold water to ensure that the bearing is in normal working condition at any time.
5. According to the temperature and pressure of the medium, the support method is to use the center support and the tripod support.