The development of seawater desalination technology has driven the synchronous development and technological progress of energy recovery devices. Existing energy recovery devices are mainly used in large and medium-sized seawater desalination projects, greatly reducing the desalination cost per ton of water. However, for small-scale seawater desalination systems, due to the structure and cost factors of existing energy recovery devices, the equipment is expensive, the initial investment is large, and the energy recovery efficiency is low. As a result, energy recovery devices are seldom or not used at all in small systems, leading to high cost per ton of water, while also restricting the application of small-scale desalination equipment and the development of miniaturized energy recovery devices.
To address this issue, our company has developed an energy recovery pump unit specifically for small-scale seawater desalination systems, filling the gap of supporting energy recovery devices for such systems and reducing the cost of seawater desalination.
For miniaturized seawater desalination units, based on energy recovery and coaxial booster technology, further optimization has been carried out to reduce the structural size. The energy recovery and booster components are integrated into a single housing, and all inlet/outlet ports are integrated on one end cover, making connection, use and maintenance convenient while providing excellent sealing performance. Using imported duplex stainless steel and imported sealing materials, combined with advanced manufacturing equipment and processes, the unit offers long service life, good sealing performance, low noise and high energy recovery efficiency even under complex fluid conditions such as high pressure, high speed and high corrosiveness.
The product has been successfully applied in small-scale reverse osmosis seawater desalination treatment systems, operating stably for a long time and receiving positive feedback from users.
The product has passed inspection by the National Center for Quality Supervision and Testing of Seawater and Brackish Water Desalination Utilization and has obtained a product inspection report.
Energy Recovery Pump Unit
The main technical specifications of our energy recovery pump unit are as follows:
| No. | Parameter | Value | No. | Parameter | Value |
|---|---|---|---|---|---|
| 1 | Inlet flow rate (m3/h) | 0.8~17 | 2 | Working pressure (MPa) | 8 |
| 3 | Raw water flow rate (m3/h) | 0.6~10.2 | 4 | Recovery rate (%) | 28~40 |
| 5 | Product water flow rate (m3/h) | 0.22~6.7 | 6 | Maintenance‑free period (h) | >8000 |
| 7 | Operating voltage/frequency (V/Hz) | AC380/50 | 8 | Speed range (rpm) | 1500~3000 |
Our energy recovery pump unit offers the following competitive advantages over similar products:
ERI does not have a model dedicated to small-scale seawater desalination units. Using a large-flow device would result in high equipment and operating costs as well as low operating efficiency. Therefore, using a PX device for small-scale projects is not feasible for cost reduction or energy saving.
Energy recovery and booster components are integrated into a single housing; motor selection is flexible without requiring a special motor with double-ended shafts as in the APM; fewer external piping connections mean fewer leakage points, easier installation and maintenance; higher recovery rate (28~40%) vs APM's 29~32%, further reducing the water production cost of small-scale desalination systems; advanced materials, processes and design concepts fill a domestic gap, completely replacing imported products and lowering the total cost of desalination systems; as a local enterprise, delivery time and service are guaranteed.
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