In order to improve the operation efficiency of multistage centrifugal pump and reduce the energy consumption of equipment, the factors affecting the efficiency of multistage centrifugal pump group are analyzed and the improvement measures are put forward. First, the impact of multistage centrifugal pump efficiency of several factors Multistage centrifugal pump efficiency is the mechanical, volume and hydraulic efficiency of the three products. Pump efficiency is the product of multistage centrifugal pump efficiency and motor efficiency. The main reasons for the low efficiency of multistage centrifugal pumps are the following. 1. Multi-stage centrifugal pump efficiency is the most fundamental impact. The same working conditions of the pump, the efficiency may differ by more than 15%. 2. Multistage centrifugal pump operating conditions lower than the rated pump conditions, low pump efficiency, high energy consumption. 3. Motor efficiency in the use of the basic remain unchanged. So it is important to choose a high efficiency motor. 4. The main impact of mechanical efficiency and design and manufacturing quality. After the pump is selected, the latter part of the management has little effect. 5. Hydraulic losses include hydraulic friction and local resistance loss. Pump running for a certain period of time, inevitably cause impeller and vane and other parts of the surface wear and tear, hydraulic loss increases, reducing hydraulic efficiency. 6. Multi-stage centrifugal pump volume loss, also known as leakage losses, including the impeller seal ring, interstage, axial force balance of three kinds of leakage losses. The level of volumetric efficiency is not only related to the design and manufacture, but also related to the latter part of management. Multistage centrifugal pump continuous operation for a certain period of time, due to the friction between the various components, the gap increases, reducing the volumetric efficiency. 7. As the filter cylinder is clogged, pipeline intake and other causes of centrifugal pump exhaust and idling. 8. Multistage centrifugal pump start before the staff do not pay attention to the preparatory work before the start of the centrifugal pump, pump, pump, perfusion pump and other basic operating procedures are not thoroughly implemented, often causing cavitation pump, causing pump noise, vibration Large, multi-stage centrifugal pump efficiency. Second, reduce the multistage centrifugal pump energy consumption and improve the efficiency of the pump measures to be taken Multistage centrifugal pump 1. Replacement of 14 low-efficiency multistage centrifugal pump. Replacement, the selection of parameters and the actual operating conditions close to the centrifugal pump to ensure that the replacement of multi-stage centrifugal pump is always running in an efficient state. We made a centrifugal pump before and after the replacement efficiency comparison experiments show that the replacement of inefficient, high consumption centrifugal pump, pump efficiency can be increased by about 10%. 2. Frequency energy-saving technologies. On the design parameters greater than the actual operating conditions of centrifugal pumps, installation of frequency control device, always running in the high-efficiency zone. 3. Promote new energy-saving products such as high-efficiency and energy-saving permanent magnet speed regulating motor and dual-power motor on the main centrifugal pump. 4. Multistage centrifugal pump selection. Selection of new pump, the pump should be selected large manufacturers to ensure high efficiency centrifugal pumps. 5. Centrifugal pump maintenance (1) The shaft end seal of the centrifugal pump should always be checked and adjusted to reduce the volume loss; (2) When the multistage centrifugal pump runs for 10,000 hours, it should be overhauled and pump efficiency restored; more Centrifugal pumps (3) Promote the use of bellows sealing technology in multistage centrifugal pumps to completely eliminate the leakage of multistage centrifugal pumps and improve the volumetric efficiency. 6. Regularly clean the filter cylinder, check the pipeline connection, to ensure that the centrifugal pump into the fluid pipeline. 7. In strict accordance with the centrifugal pump operating procedures, pump the pump to open the previous one, open the inlet valve, close the outlet valve, exhaust venting, check the pump inlet pressure meets the requirements. Prevent cavitation of the pump from occurring due to low fluid pressure and insufficient flow rate. 8. Pumps on a regular basis for the pump test, pump low pump group, to find out the reasons in time to take appropriate measures to be resolved. When a centrifugal pump is used to pump a slurry flow containing large, medium, and small sizes of material in a liquid, the liquid is tangentially injected into the cylindrical chamber to form a swirling flow and a portion of the liquid is tangentially removed from the chamber ; Axially injecting the slurry into the chamber, the vortex separating the oversized material from the remainder of the slurry and liquid; axially removing the remaining slurry and liquid from the chamber and injecting it into the inlet of the centrifugal pump; The material from the centrifugal pump acts as a spray liquid forming the vortex to reduce the wear of the centrifugal pump impeller and increase the efficiency of the centrifugal pump.When a multistage centrifugal pump is used to pump a slurry flow containing large to small size material in a liquid A method of reducing the wear of a centrifugal pump impeller and increasing the efficiency of a centrifugal pump, characterized in that it comprises: a directing the liquid into the vortex chamber to form a vortex and tangentially removing a portion of the liquid from the chamber; Axial injection into the chamber, the vortex separating the large size of the material from the remaining slurry and liquid; and (c) axially displacing the remaining slurry and liquid from the chamber and spraying Centrifugal pump imports; d use from The material discharged from the centrifugal pump serves as a spray liquid for forming the vortex flow; therefore, the large-sized material moves toward the outer circumference of the vortex flow to be discharged, and as a result, medium and small-sized materials and liquids are injected into the centrifugal pump , Reducing wear on the impeller and allowing the pump to run at high speeds, thus increasing efficiency.
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