How to calculate the pressure difference of the orifice plate
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Release Time：2020-08-03
Wuhan Xiete Valve Technology Co., Ltd. is mainly committed to the technological innovation of high-pressure water descaling valve and high-pressure hydraulic press. Its main products include descaling injection valve, liquid filling valve, throttle orifice plate, electric heat tracing leak-proof gas drain, coking screw feeder, sintered roller distributor, balanced pneumatic stop valve, high-pressure pneumatic gate valve, etc.
In order to calculateThrottle orifice plateA new concept of bai, the blocking flow du differential pressure Δps, needs to be introduced. When it is necessary to introduce a new concept of bai, the pressure difference p between the two ends of the blocking flow du, the pressure difference Δps, increases, the flow rate qm also increases. When the pressure difference p increases to a certain value, the pressure pvc at the constriction drops below the saturated vapor pressure pv of the fluid, part of the fluid evaporates, and the pipe flow no longer increases with the increase of the pressure difference, forming the so-called blocking flow phenomenon. At this time, the pressure difference between the two ends of the orifice plate is called the blocking flow pressure difference PS. WhenThrottle orifice plateFlashing or cavitation can be avoided when the actual pressure difference p is less than its corresponding pressure difference ps. When the pressure difference between the two ends of the pipeline is large, multi-stage pressure reduction can be used, but the actual pressure difference p of each stage of orifice plate should be less than the corresponding ps of the inlet of the stage.
According to the literature, the pressure drop of the multi-stage orifice plate decreases geometrically. When the actual pressure drop of the first stage orifice plate is P1, the second stage orifice plate is depressurized to P1/2, and the third stage orifice plate is depressurized to P1/22. Decompression of stage 4 orifice plate to P1/23,..., Decompression of the first stage orifice plate to P1/2n until the last stageThrottle orifice plateAfter the pressure is close to the required pressure.
Taking the condensate pump recirculation pipe of a plant as an example, it is found that the pipe vibrates greatly during the operation of the unit. The analysis reasons are as follows: when the condensate pump is in normal operation, the outlet pressure is about 1.5 MPa, and the inlet pressure of the make-up water tank is about 0.12 MPa. When the softened water at the outlet of the pump flows back to the make-up water tank through the recirculation pipe, the pressure difference is very large, and only an electric gate valve is installed on the pipeline, but no regulating valve is installed, causing vibration. In order to reduce vibration, in the first design change, an orifice plate was added. After the actual operation, the pump outlet pipe vibration has improved,Throttle orifice plateCavitation in rear pipe. It shows that the idea of reducing pressure by increasing the throttle orifice plate is correct, but the choice of orifice plate needs to be adjusted. Considering that the pipeline is affected by 44.01 2千帕 static pressure difference,Throttle orifice plateMaximum pressure difference between the two ends.
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