Adjust the DG type horizontal multi-stage high-pressure centrifugal pump flow method

Through the characteristics of centrifugal pump and piping system graph we can analyze the DG type horizontal multi-stage high-pressure centrifugal pump flow control of several main ways: export valve adjustment, pump variable speed adjustment and pump series, in parallel to adjust. Export was analyzed by using the characteristic curves of regulating valve and pump speed regulating energy loss in two ways, and has carried on the contrast, points out that the centrifugal pump with variable speed regulating flow than with export flow adjusting valve can better save energy consumption, and energy saving efficiency and the size of the flow changes. In practical application, you should pay attention to the range of speed regulation, can better use centrifugal pump variable speed control. DG type horizontal multi-stage high-pressure centrifugal pump flow control of the main ways mainly have three kinds:

1) Change of pipeline characteristic curve

change the simplest method is to use centrifugal pump pump discharge valve to control the opening, the essence of which is the location of the change of pipeline characteristic curve to change pump working point 2)

Centrifugal pump characteristic curve

according to the proportion law and the law of cutting, change the pump rotation speed, the pump structure ( Such as cutting impeller diameter, etc. ) Both methods can change characteristic curve of centrifugal pump, so as to achieve adjusting flow ( At the same time change the head) The purpose of. But for the pump work, has changed the water pump structure method is not very convenient, and because change the structure of the pump, reduces the versatility of the pump, even though it at some point adjustment convenient traffic economy [ 1] , and rarely used in production. Just how changes in centrifugal pump flow of speed adjusting method. From figure 1, when change the pump speed adjusting flow rate decreased from Q1 to Q2, the pump speed ( Or motor speed) Reduced to n2 from n1, speed for the water pump characteristic curve of Q - under n2 H and pipeline characteristic curve He = H0 + G1Qe2 ( Pipeline characteristic curve does not change) In point of A3 ( Q2，H3) A3, point to by speed adjusting flow after new working point. The adjustment method of adjustment effect, quick, safe and reliable, can prolong the service life of the pump, save electricity, reduce speed running also can effectively reduce the NPSH of centrifugal pump NPSHr, away from the pump cavitation area, reduce the risk of deeloping cavitation in centrifugal pump. The disadvantage is that change the pump speed by variable frequency technology are needed to change the prime mover ( Usually the motor, The rotational speed, the principle of complex, investment is bigger, and the flow adjustment range is small.

        3） Pumps in series, and even adjusting method

when a single centrifugal pump can't meet the delivery task, can use of centrifugal pump in parallel or in series operation. With two sets of the same type of centrifugal pump in parallel, although the head changed little, but increased the total transportation flow, the total efficiency of the pump in parallel with a single pump efficiency is the same; Centrifugal pump series when the total pressure head, flow rate change is not big, the total efficiency of the pump with single pump efficiency is the same.

     

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