Regarding the issue of impeller cutting
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Our factory has one multi-stage high-pressure amine pump, model TDJ50-150×10. It has 10 impellers, a rated head of 1500 m, a rated flow rate of 41.28 m3/h, a net positive suction head of 3.2 m, a rated efficiency of 47%, a rated speed of 2980 r/min, a motor power of 500 Kw, an inlet diameter of 100 mm, and an outlet diameter of 80 mm. In the process flow, the amine solution is pressurized to 13.9 Mpa by the amine pump and then enters the 23.2-m-high circulating hydrogen desulfurization tower from the top, where it comes into contact with the gas coming from the bottom in a counter-current manner to carry out desulfurization. The actual process flow rate of the pump of 20 m3/h is sufficient to meet the requirements. Now, in order to save energy, is it possible to cut the impeller of the entire pump by cutting the impeller itself? What precautions should be taken during such cutting, and which parameters will be affected? How much would it cost to add another inverter to the motor, and which method is better? Is there a better way besides this?
It’s a shame to cut it; it’s better to get a set with variable frequency. Wouldn’t it be better to have the pump manufacturer replace the set of impellers, or to purchase a set of rotors with a smaller diameter that suits you? . If you find evidence of cutting here, would you dare to accept it? :lol
This multi-stage pump incorporates a cut-out impeller or other methods, primarily for the purpose of saving energy and reducing consumption; the outlet flow rate of this pump can be adjusted using other methods.
Replace it with another set of impellers, of different hydraulic characteristics. This allows for better efficiency within the range of traffic you need
Firstly, the power consumption of the inverter itself is 5%, which is 25 kilowatts. It will also generate second harmonics, which may affect your circuit. Secondly, impeller cutting leads to a decrease in pump efficiency and reduced flow rate, and may even cause vibrations under abnormal operating conditions. Once again, even if you adopt the above two solutions, efficiency will still decline. It is recommended that you order a new pump with a capacity of 20 cubic meters, for a range of 1500 meters. The power-saving effect achieved in this way is the best and also the safest.