What are the energy-saving technologies for large-scale circulating water pumps?

A variable-frequency one would be better, I guess. . . Changing the impeller probably won’t save that much either

Each case must be analyzed on its own; both flow rate and head will change after frequency conversion, and the operational requirements must be met first.

Typically, for the energy-saving renovation of circulating water pumps, from the perspective of the equipment, common methods include the use of high-efficiency impellers such as three-dimensional flow impellers, impeller trimming, and frequency conversion. Of course, if the existing process flow is not optimized enough, it is also possible to approach the issue from a process perspective and optimize details such as water usage patterns and flow rates by making changes to the process flow. It ultimately depends on what the original poster’s main needs are.

This post was last edited by WSRYLONG on 2018-9-14 09:33. If the flow rate needs to be adjusted frequently, variable frequency drives offer advantages. However, the flow rate of circulating water generally does not need to be adjusted frequently; using energy-saving pumps and impellers is better than using frequency converters. Energy-saving pumps and energy-saving impellers can improve the efficiency at the operating point, whereas frequency converters cannot do so ； Moreover, the inverter itself consumes about 5% of the electrical energy. Moreover, high-power high-voltage frequency converters are not cheap. As for circulation water pumps, as long as there is no need for frequent adjustments, everything that can be achieved by other frequency converters can also be accomplished by energy-saving pumps and energy-saving impellers, with higher efficiency and better energy-saving effects.

Energy saving is approached from three aspects. The first is suitability, meaning that all requirements are met, with the input power being minimized; flow rates and head values are set at the level just sufficient to satisfy the usage requirements, without any excess or waste. 2. It is to improve efficiency by adjusting the hydraulic components and transmission components to achieve the highest level of efficiency, thereby saving energy. For operating conditions with variable loads or fluctuations between peak, valley, and average levels, a regulated operation mode is employed – such as variable frequency control, adjustment of hydraulic components, or modification of the pipeline openings – to ensure that the pump always meets the requirements of the current operating conditions, thereby avoiding energy waste and achieving energy savings

We can use polymer-based super-hydrophobic cerametal coatings, which possess super-hydrophobic properties that reduce the flow resistance on the surface through which fluid flows. This lowers the amount of electrical energy wasted as useless work, alters the flow pattern of the fluid, allowing it to pass more smoothly over that surface. As a result, more of the electrical energy is utilized effectively, thereby achieving energy savings and reduced consumption. It is currently being used in industries such as electricity, water supply, and chemicals, with very good results. What type is your circulation pump?

Provide services for repairing defects such as cavitation, as well as energy-saving and consumption-reduction technologies.

It can be changed to be driven by a turbine, making use of excess steam, and the flow rate can also be adjusted.

Energy recovery turbines are a field in energy conservation

In favor of the pro side’s view{:1_90:}