Reducing the operating temperature difference of the centrifugal compressor unit The difference between the energy consumption of the centrifugal compressor unit and the condensing temperature and the evaporating temperature is the operating temperature difference. The smaller the working temperature difference, the smaller the energy consumption of the unit. Therefore, in order to meet the user's requirements, to obtain a smaller working temperature difference, we should try to reduce the unit's condensation temperature and increase its evaporation temperature. The use of high-efficiency heat exchangers is an effective method. At present, high heat flow porous heat exchange tubes have been widely used in foreign countries for evaporators. Compared with the traditional finned tube, the evaporation temperature can be increased by about 3 °C, so that by reducing the working temperature difference, the unit can reduce the energy consumption by about 10%. In addition, timely removal of non-condensable gases in the unit can reduce the operating temperature difference of the unit. According to calculation, when the non-condensable gas content in the refrigerant is 5%, the energy consumption of the unit will be reduced by more than 50%. Therefore, the centrifugal compressor unit must be equipped with an automatic purification device to reduce the energy consumption of the unit and save energy.
Energy-saving retrofit of centrifugal compressors. Designing the impeller with ternary flow In order to improve the stage efficiency of the impeller, the existing impeller can be transformed into a ternary flow impeller through a ternary flow design to improve the impeller performance. The data shows that the new impeller with ternary flow design can increase the efficiency of the original impeller by 3% to 10%. The energy saving effect is very obvious in the case of single machine transformation. The impeller wheel resistance loss is reduced and the wheel surface roughness is reduced. The main way to resist losses is to grind and polish on the basis of precision casting or finishing. The wheel and the wheel cover are planes with a large surface area, which are suitable for the method of sanding and polishing to obtain low surface roughness, while for the impeller flow channel, liquid polishing is preferred. After domestic and foreign scholars polish and polish the impeller The energy-saving analysis proves that its energy-saving effect is remarkable, and the energy consumption can be reduced by about 5%.
Ensure that the vane diffuser and the impeller match each other. Under variable operating conditions, the flow stall at the exit of the compressor impeller at high speed will affect the inlet of the vane diffuser, resulting in increased losses and reduced stage efficiency. Therefore, the matching between the vane diffuser and the impeller must be achieved to ensure that the centrifugal compressor operates at a higher efficiency. There are many ways to increase the flow rate of the compressor to increase the flow rate of the centrifugal compressor, such as re-engineering the entire design or performing partial modifications.
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