The outstanding characteristics of chemical centrifugal pump.
Centrifugal pump is our industrial production of the most commonly used pump, chemical centrifugal pump is one of them, it through the impeller impeller liquid flows by the effect of centrifugal force, improve the mechanical energy of the liquid, thus for liquid transportation, it is an increase of liquid energy machine. Due to the special requirements of chemical production for pumps, the chemical centrifugal pump has the following characteristics compared with other centrifugal pumps:
(1) it can adapt to chemical process needs.
Pump in the chemical production, not only to transport liquid materials and provide the necessary pressure process requirement, also must ensure that the amount of material conveying, in a certain chemical unit operations, requires the capacity and head of the pump to stability, keep the pump efficiency and reliable operation.
(2) corrosion resistant stainless steel chemical pump.
The medium of chemical pump conveying, including raw material, reaction intermediate and so on are often corrosive medium. This requires the material of the pump to choose proper and reasonable, ensure the safe, stable, long life operation of the pump.
(3) high temperature and low temperature.
The high temperature medium of the centrifugal pump of chemical industry has the process liquid material, and also has the need of the reaction process and the generated hot liquid. For example: condensate pump, boiler feed water pump, heat conduction pump. Many kinds of low temperature medium, the chemical pump such as: liquid oxygen, liquid nitrogen, methane, etc., low working temperature of pump are mostly in a 20 ~ 10 ℃. Regardless of conveying high temperature or low temperature chemical pump, material selection and structure must be appropriate, must have sufficient strength, design and manufacture of pump parts to heat shock, heat expansion and cold deformation and brittle at low temperatures, etc.
(4) wear resistance and erosion resistance.
Due to chemical centrifugal pump is suspended solid particle in the logistics, at the same time, pump impeller, cavity is also some work under high pressure high velocity, pump parts surface protective layer are destroyed, its life is short, so you have to improve the chemical pump wear resistance, erosion resistance, which requires the material selection of pump wear resistant manganese steel, ceramics, cast iron, etc., and selects the scour resistance of titanium, manganese steel, etc.
(5) reliable operation
The operation reliability of chemical pump consists of two meanings: one is that the long period can not run the fault; The second is the smooth operation of various parameters. The reliability of operation is critical to chemical production. If the pump frequently fails, it will not only cause frequent production shutdown, but also affect the production and economic benefits, and sometimes may cause accidents in chemical systems. Chemical pump rotation speed fluctuation, can cause flow and pump outlet pressure fluctuations, make chemical production can't normal response affected by or in the system, the material can not balance, wasteful, or even cause the loss of the quality of the product or make products to be scrapped.
(6) no leakage or leakage.
Chemical pump is medium most of inflammable, explosive, poisonous and harmful liquid, once the leak will seriously pollute the environment, endanger personal safety and health of body and mind of the worker, the more don't accord with the requirement of no leak factory clean and civilized factory, it must ensure that the chemical pump run time does not leak, on the sealing of pump adopts new technology, new materials, according to the rules of operation, the high quality maintenance.
(7) liquid that can transport the critical state.
A liquid in a critical state usually vaporizes when the temperature increases or the pressure decreases. The chemical pump sometimes transports the critical state liquid, and once the liquid is vaporized in the pump, it is easy to produce cavitation damage, which requires the pump to have high cavitation resistance. At the same time, the vaporization of the liquid may cause the friction and gluing of the moving parts in the pump, which requires the clearance to be larger. In order to avoid the failure of mechanical seal, packing seal, labyrinth seal and other dry friction due to the vaporization of the liquid, such chemical pump must have a structure that fully eliminates the gas that occurs in the pump.
The pump with the critical state liquid can be used for self-lubricating material, such as ptfe, graphite, etc. For shaft seal structure, besides packing seal, double end mechanical seal or labyrinth seal can be used. When the double-end mechanical seal is used, the cavity between the two ends is filled with external sealing liquid. Sealing gas with certain pressure can be introduced from the outside when the labyrinth seal is used. When sealing liquid or sealing gas leak into the pump, it should be harmless to pump medium, if leakage into the atmosphere is not harmful. If the liquid helium of the critical state is transported, methanol can be used as the sealing liquid in the cavity of the double-end mechanical seal. Nitrogen is introduced into the labyrinth seal when conveying liquid hydrocarbon.
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