What Are The Energy-saving Technologies Of Slurry Pumps?

What are the energy-saving technologies of slurry pumps?

The main energy-saving technologies in China include the following energy-saving technologies. Slurry water pump technology manufacturers briefly talk about the main energy-saving technologies of slurry pumps. Currently, there are four energy-saving technologies: cutting impeller, frequency conversion technology, ternary flow technology and energy-saving pump. Let’s analyze the characteristics of these energy-saving technologies below.

Energy saving for cutting impeller*, In the structure of a centrifugal slurry pump, an important component that determines the amount of water and the height of the head is the impeller. Its working principle is that the high-speed rotating impeller drives the liquid inside it to rotate, thereby generating centrifugal force. We learned in junior high school physics class. An important factor that determines the magnitude of centrifugal force is the rotation radius. From this we can see that once the impeller of a centrifugal pump is cut, that is, the diameter of the impeller is reduced, the centrifugal force of the liquid inside the impeller will definitely decrease. The consequence can only cause the flow rate and head parameters of the slurry pump to drop, which may cause hidden dangers to safe production.

Frequency Converter Energy Saving Technology The main working principle of frequency conversion is to rely on frequency conversion to change the frequency of the slurry pump driving motor and reduce the motor speed to achieve energy saving effect. The main application range is:

① The load of the motor changes periodically with the needs of the production conditions. In this operating conditions, when the production load decreases, the load of the motor also decreases. Using frequency conversion technology can reduce the speed of the motor at this time, thereby achieving the energy saving effect. However, in a system with relatively stable operating conditions, the energy saving rate of the frequency conversion technology will significantly decrease.

② It is only when adapted to some slurry pumps with large design parameters due to the so-called "big horse pulling cart" that have a certain effect. In this working condition, relying on frequency conversion to change the frequency of the pump motor, reduce the speed of the pump, adjust the Q and H values of the slurry pump, so that the actual flow value of the slurry pump is lower than the rated flow value of the slurry pump, so as to achieve the purpose of energy saving.

Centrifugal pumps are designed with the specific speed under good hydraulic characteristics as a similar criterion. The geometric dimensions of the flow channel hydraulic model of each pump must correspond one by one to its design parameters Q (flow), H (head), and r/min (speed) to produce the final efficiency of the slurry pump. Therefore, the hydraulic model and geometric dimensions of the pump impeller cannot be changed accordingly with the change of rotational speed. Therefore, frequency conversion speed regulation reduces the rated rotational speed of the pump, and the output flow of the pump decreases, the head of the pump decreases, the actual pump efficiency decreases, and is much lower than the original efficiency value of the pump.

When the performance parameters Q and H values of the circulating slurry pump selected for industrial circulation water systems are not large, if frequency conversion speed regulation is used to reduce the actual parameters Q and H values of the pump, it may cause the slurry pump flow reduction value to be too large, the system cooling water volume is insufficient, and the cooling water system water temperature increases.

Triple flow technology Triple flow technology is to infinitely divide the three-dimensional space inside the impeller, and establish a complete and real mathematical model of flow in the impeller through the analysis of each working point in the impeller flow channel. Through this method, the impeller flow path analysis can be done accurately, reflecting the flow field and pressure distribution of the fluid are also close to reality. The flow characteristics of the impeller outlet are jets and trails (vortexes), which are reflected in the design calculations. Therefore, the designed impeller can better meet the working conditions requirements and significantly improve efficiency.

However, if the impeller of the ordinary slurry pump is simply replaced with a ternary flow impeller, its energy saving effect may not be as expected, because when the pump housing and other components have been set, the individual ternary flow impeller cannot change the water resistance and water loss of all overflow components inside the entire slurry pump.

Energy-saving slurry pumps Energy-saving slurry pumps are specially tailored for various types of circulating water systems. They comprehensively utilize various technologies to combine siphon principle and ternary flow technology, and control the energy-saving slurry pumps from the entire process of design, mold opening, casting, and processing, so that their design is reasonable and the mold opening meets the design requirements. Then, advanced casting technology is applied to reduce casting errors. Finally, through careful processing and polishing, the final product is consistent with the design concept and achieves a good state.

When the fluid circulates internally in the energy-saving slurry pump, it can present a relatively regular flow state, reducing losses such as inlet shock and outlet tail deflow, greatly avoiding the occurrence of turbulence, reducing the impact and deflow of fluid in the single-channel hydraulic model design of ordinary pumps, and preventing water from forming a return between the blades, making the flow of water between the impellers closer to the design state, increasing the flow of the slurry pump, reducing useless work, reducing energy consumption, and improving the efficiency of the slurry pump.

The slurry pump using this technology can significantly reduce the effective shaft power of the slurry pump without any change in the flow rate. Moreover, the industrial system is fully loaded and will not increase the water temperature of the cooling water system, and it will not change the operating parameters of the system, and will have no impact on normal production work.