The factors influencing the efficiency of centrifugal pump are analyzed, and the improvement measures are put forward to improve the operation efficiency of centrifugal pump and reduce the energy consumption of the equipment.
First, the centrifugal pump efficiency of several factors Centrifugal pump efficiency is the product of mechanical, volume and hydraulic efficiency of the three. Pump efficiency is the product of pump efficiency and motor efficiency. Centrifugal pump group caused by the low efficiency of the following factors.
1. Pump efficiency itself is the most fundamental effect. The same working conditions of the pump, the efficiency may differ by more than 15%.
2. 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 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. 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. 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. Before starting the pump, the staff did not pay attention to the preparatory work before the start of the centrifugal pump. The implementation of basic operating procedures such as warm pump, disk pump and perfusion pump was not implemented thoroughly, often resulting in the cavitation of the pump, causing large pump noise, large vibration and low pump efficiency.
Second, reduce centrifugal pump energy consumption, improve pump efficiency measures to be taken 1. Replace 14 low efficiency centrifugal pumps. Replacement, the selection of parameters and the actual operating conditions close to the centrifugal pump to ensure that the replacement of the 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 of centrifugal pumps, pump efficiency can be increased by about 10%.
2. Application of Frequency Conversion Energy Saving Technology. 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 and apply 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. 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) Check and adjust the shaft end seal of the centrifugal pump often to reduce the volume loss; (2) Overhaul and restore the pump efficiency after the centrifugal pump has been operated for 10,000 hours; (3) Promote the application of corrugation Tube sealing technology, the complete elimination of centrifugal pump leakage, improve 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, the pump must be preceded by a pump, 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. Centrifugal pump on a regular basis to test the pump, 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 discharged from the centrifugal pump serves as a spray liquid for forming the vortex, thereby reducing the wear of the centrifugal pump impeller and increasing the efficiency of the centrifugal pump.
Centrifugal pump for pumping liquid containing a large size to a small size of the material flow of the mud to reduce centrifugal pump impeller wear and improve the efficiency of the method, characterized in that it comprises:
a. injecting a liquid tangentially into the vortex chamber to form a vortex and tangentially removing a portion of the liquid from the chamber;
b. injecting the slurry axially into the chamber, the vortex separating the large size of the material from the remaining slurry and liquid;
c. axially displacing the remaining slurry and liquid from the chamber and injecting it into the inlet of a centrifugal pump;
d. Utilizing the material pumped out of the centrifugal pump as the ejection liquid forming the vortex flow; therefore, the large-sized material moves toward the outer circumference of the vortex flow to be discharged, with the result that medium and small-sized material and liquid are ejected The centrifugal pump, therefore, reduces wear on the impeller and allows the pump to operate at high speed, thus increasing efficiency.