Reason analysis of laboratory centrifuge surge

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1: condenser fouling condenser in heat exchanger tube sheet (water fouling of cooling water system of open circulation of the most easy scale), incurred heat transfer thermal resistance increases, reducing the effect of heat transfer, the condensing temperature increases or the evaporating temperature lower, in addition, laboratory centrifuge to understand because the water quality without disposal and poor maintenance, the same form of heat exchanger inside and outside the tube packing sand table, impurity, algae and other objects, the formation of condensing pressure and bring about produce centrifuge surge.
2 refrigeration system with air: when the operation experiment of centrifugal compressor, evaporator and laboratory centrifuge understanding because of low pressure pipeline are in the vacuum state, so the connection is extremely easy infiltration air, air is also non condensable gas, adiabatic index is very high, to 1.4, when the air in the upper part of the condenser condensate product, form the condensing pressure and condensation temperature, and bring about produce centrifuge surge.
3 cooling tower cooling water circulation quantity deficiency, water temperature is too high. Due to poor cooling effect of cooling tower and the formation of condensation pressure is too high, and lead to the onset of surge.
The 4 evaporator through the low temperature refrigerant, refrigeration system: due to lack of volume load is reduced, the ball valve is opened through the formation of small, evaporating pressure is too low and surge.
5 shutdown is not closed small guide vane angle and reduce experimental centrifuge outlet pressure. Laboratory centrifuge is recommended when the centrifuge shutdown, because the pressurization suddenly disappeared, the high pressure refrigerant vapor condenser in the volute and the intrusion, easy surge.