Method 1: The outlet valve is adjusted in this way. The pump is connected in series with the outlet line regulating valve. The actual effect is the same as the new pump system. The pump's large output head does not change, but the flow curve is attenuated.
Method 2: Bypass valve adjustment In this method, the valve and the pump are connected in parallel. The actual effect is the same as the new pump system. The pump's large output head changes, and the flow curve characteristics also change. The flow curve is closer. Linear.
Method 3: Adjusting the impeller diameter This method does not use any external components, and the flow characteristic curve varies with diameter.
Method 4: Speed ​​control The impeller speed change directly changes the pump flow curve, and the characteristics of the curve do not change. When the speed decreases, the curve becomes flat, and the indenter and the Zui large flow rate decrease.
The overall efficiency of the pump system, both the outlet valve adjustment and the bypass adjustment method, increases the line pressure loss and the pump system efficiency is greatly reduced. The impeller diameter adjustment has little effect on the efficiency of the whole pump system, and the speed control method basically does not affect the system efficiency, as long as the speed is not lower than 50% of the normal speed.
Energy consumption level:
Assume that the output flow of the pump is adjusted from 60m3/h to 50m3/h by the above four methods, and the power consumption when the output is 60m3/h is 100% (at this time, the indenter is 70m), then several methods for controlling the flow rate are What is the impact of the power consumed by the pump?
(1) The opening degree of the outlet valve is adjusted, the energy consumption is 94%, and the power consumption is large when the flow rate is low.
(2) Bypass adjustment, the bypass valve reduces the pump head to 55M, which can only be achieved by increasing the pump flow, resulting in a 10% increase in energy consumption.
(3) Adjusting the diameter of the impeller, reducing the diameter of the impeller, the output flow and pressure of the pump are reduced, and the energy consumption is reduced to 67%.
(4) Speed ​​control, the speed is reduced, the flow rate and head of the pump are reduced, and the energy consumption is reduced to 65%.
Method 2: Bypass valve adjustment In this method, the valve and the pump are connected in parallel. The actual effect is the same as the new pump system. The pump's large output head changes, and the flow curve characteristics also change. The flow curve is closer. Linear.
Method 3: Adjusting the impeller diameter This method does not use any external components, and the flow characteristic curve varies with diameter.
Method 4: Speed ​​control The impeller speed change directly changes the pump flow curve, and the characteristics of the curve do not change. When the speed decreases, the curve becomes flat, and the indenter and the Zui large flow rate decrease.
The overall efficiency of the pump system, both the outlet valve adjustment and the bypass adjustment method, increases the line pressure loss and the pump system efficiency is greatly reduced. The impeller diameter adjustment has little effect on the efficiency of the whole pump system, and the speed control method basically does not affect the system efficiency, as long as the speed is not lower than 50% of the normal speed.
Energy consumption level:
Assume that the output flow of the pump is adjusted from 60m3/h to 50m3/h by the above four methods, and the power consumption when the output is 60m3/h is 100% (at this time, the indenter is 70m), then several methods for controlling the flow rate are What is the impact of the power consumed by the pump?
(1) The opening degree of the outlet valve is adjusted, the energy consumption is 94%, and the power consumption is large when the flow rate is low.
(2) Bypass adjustment, the bypass valve reduces the pump head to 55M, which can only be achieved by increasing the pump flow, resulting in a 10% increase in energy consumption.
(3) Adjusting the diameter of the impeller, reducing the diameter of the impeller, the output flow and pressure of the pump are reduced, and the energy consumption is reduced to 67%.
(4) Speed ​​control, the speed is reduced, the flow rate and head of the pump are reduced, and the energy consumption is reduced to 65%.
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