According to the material flow direction of the die head and the angle between the center line of the screw, the extruder can divide the die head into right angle die head and oblique angle die head.
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The latest centrifugal pump energy saving tips
Centrifugal pump is widely used in chemical industry system, a universal fluid machinery. It has a wide range of functional habits (including flow, pressure head and the nature of the transport media habits), small size, layout is simple, simple operation, operating costs and many other advantages of one level. In general, the selected centrifugal pump flow, pressure head may be inconsistent with the needs of the pipeline, or because of the production mission, skills needs seizure changes, now require the pump flow conditioning, the essence is to change the centrifugal pump operation point. Centrifugal pump operating point is determined by the pump characteristic curve and piping system characteristic curve together, therefore, to modify any one characteristic curve can reach the intention of the flow regulation. At present, the centrifugal pump flow conditioning methods are mainly conditioning valve control, variable speed control and the pump and the series conditioning. Because the principle of various conditioning methods is not the same, in addition to personal advantages and disadvantages, the formation of energy loss is not the same, in order to find the best, the least energy consumption, the most energy-efficient flow regulation.
Pump flow regulation of the first solution
(1) change the pipeline characteristic curve
The most simple way to change the centrifugal pump flow is to use the pump outlet valve opening to control, its essence is to change the orientation of the pipeline characteristic curve to change the pump operation
point.
(2) change centrifugal pump characteristic curve
According to the law of the share and cut open, changing the pump speed, changing the pump layout (such as cutting impeller diameter method, etc.) are two ways to change the centrifugal pump characteristic curve, and then reach the conditioning flow (together with the change indenter) intent. However, with respect to pumps that are already in operation, it is inconvenient to change the layout of the pump, and due to a change in the layout of the pump, the versatility of the pump has been reduced. Although it is economically convenient to regulate the flow of traffic at certain times1, it is also rarely produced Use. Here only analyze changes in centrifugal pump speed conditioning flow approach. When the pump speed conditioning flow changes from Q1 to Q2, the pump speed (or motor speed) from n1 down to n2, the speed of n2 pump curve QH and the pipeline characteristics curve He = H0 + G1Qe2 The curve does not change) to point A3 (Q2, H3), point A3 after the governor flow rate after the new operating point. This conditioning conditioning effect is significant, convenient, safe and reliable, can extend the pump life, save energy, and other descending speed operation can also be useful to reduce centrifugal pump NPSHr, pump away from the cavitation zone, reducing Possibility of centrifugal pump attack cavitation 2. Defects are the need to change the speed of the pump After the frequency conversion skills to change the original motivation (usually the motor) speed, the principle of chaos, a larger investment, and the flow of small-scale regulation.
(3) pump string, and even conditioning
When a single centrifugal pump can not meet the delivery mission, can choose centrifugal pumps in parallel or in series operation. With two centrifugal pumps of the same type in parallel, although the pressure head changes little, but increased the total delivery flow, the total power of parallel pumps and single pump power; centrifugal pump in series when the total pressure head increases, Little change in traffic, tandem pump total power and single pump power the same.
About the current centrifugal pump outlet valve conditioning and pump variable speed regulation of two primary traffic conditioning methods, variable speed pump governor saves much more energy than the outlet valve conditioning, which can be both from the power analysis and power consumption According to analysis. After centrifugal pump flow and lift of the contact map, can more intuitively reflect the energy consumption under the two conditioning methods. After the pump speed control to reduce the flow rate is also beneficial to reduce the possibility of centrifugal pump attack cavitation. When the flow rate decreases, the greater the energy saving power of the speed regulation, that is, the greater the valve conditioning loss power, however, the pump power is too large will form a decline in pump power, exceeding the pump size of the law, so that in practice Probably think in many ways, in between the two out of the best traffic conditioning.