Centrifugal pump operating point and flow regulation
When the centrifugal pump is installed in a specific piping system, the flow and head pressure that the pump should provide should be determined by the piping requirements. The curve of the required pressure head and flow rate of the pipeline is called the pipeline characteristic curve, and the equation is expressed by the following formula: He=A+BQe2
Second, the working point of the centrifugal pump
When the pump is installed in a certain pipeline system, the characteristic curve of the pump and the intersection of the pipeline and the curve are the working points of the pump. The flow and head shown at the operating point are both the flow and head provided by the pump and the flow and head required for the line. The centrifugal pump only works at the working point and the flow in the tube can be stabilized. The operating point of the pump is preferably within the high efficiency of the pump.
Third, the flow adjustment of the centrifugal pump
For a pump, the characteristic curve does not change and the line characteristic curve is variable. When the flow rate provided by the operating point of the pump does not meet the required flow rate under the new conditions, the position of the pump operating point should be changed, that is, the flow adjustment is required.
The methods of flow regulation are as follows:
(1) Install a regulating valve on the outlet line of the centrifugal pump to change the opening degree of the valve, that is, change the B value in the pipeline characteristic curve He=A+BQe2, the valve is opened, and the working point is away from the vertical axis; the valve is closed and works. The point is near the vertical axis.
The advantage of this adjustment method is that it is easy and flexible to operate. The disadvantage is that when the valve is closed, the resistance in the pipeline is increased, and the energy loss is increased, so that the pump cannot work in the high efficiency region of the Zui, which is uneconomical. The method of changing the valve opening degree to adjust the flow rate is often used when the flow adjustment range is not large and the adjustment is often required.
(2) Change the speed of the pump, that is, change the characteristic curve of the pump.
(3) The outer diameter of the turning impeller also changes the characteristic curve of the pump. The above two methods can be used to change the curve of the pump. Using these methods to adjust the flow rate within a certain range can ensure that the pump works in a high efficiency zone. The energy utilization is economical, but inconvenient, and the flow regulation range is not large, so the application is not extensive.
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