In recent years, with the development and widespread application of reverse osmosis seawater desalination technology, energy recovery from the high‑pressure concentrate (more than 60% of the feed) has become a key concern in the industry. Discharging the high‑pressure concentrate directly after reverse osmosis would cause significant energy waste and increase the cost of producing fresh water from seawater. Therefore, a device is needed to transfer the high pressure from the concentrate to the feed seawater that requires reverse osmosis treatment, without directly mixing the concentrate with the feed. Currently, there is no such device in China; main options are imported from ERI (PX series) in the U.S. and Danfoss (iSave, APM) in Denmark. Inevitable pressure losses occur during the desalination and recovery processes, and direct recovery cannot meet the inlet pressure requirement of the reverse osmosis membrane. The problem with the aforementioned imported devices is that they require a separate booster pump to raise the pressure, which increases equipment investment, including space occupation, equipment cost, maintenance cost, and also leads to many external piping connections, complex pipe networks, and high leakage risk. Moreover, imported devices are expensive and have long after‑sales service cycles.
To address this, our company has specially developed a new type of energy recovery device that uses integrated rotor pressure exchange technology. It not only solves the energy recovery problem for concentrate but also addresses pressure compensation, eliminates external piping connections, and offers better sealing performance. Additionally, it features low noise, a small overall footprint, and easy installation. It breaks the monopoly of imported products, reduces overall equipment cost, shortens delivery and after‑sales maintenance cycles, and has good market prospects.
The rotor energy recovery and coaxial booster device features an integrated design with compact structure, high energy recovery efficiency, fewer external piping connections, and excellent sealing performance. The energy recovery pump unit technology further reduces device dimensions by integrating energy recovery and boosting components into a single housing, and integrating all inlet/outlet ports on one end cover, making connection, use and maintenance convenient while providing superior sealing properties.
Seawater Desalination Rotor Energy Recovery and Coaxial Booster Device
The product has been successfully applied in 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.
The product has obtained the Zhejiang Provincial Industrial New Product (New Technology) appraisal certificate.
Together with the pure water‑lubricated axial piston pump project, the product was included in the 2015 Central Budget Investment Project Catalogue for Energy Conservation, Circular Economy and Resource Utilization of the National Development and Reform Commission, and received corresponding allocated funds.
The main technical specifications of the rotor energy recovery and coaxial booster device are shown in the table below:
| No. | Parameter | Value | No. | Parameter | Value |
|---|---|---|---|---|---|
| 1 | Flow rate range (m³/h) | 13~40 | 2 | Working pressure (MPa) | 8 |
| 3 | Speed range (rpm) | 600~1200 | 4 | Energy conversion efficiency (%) | 97.7 |
| 5 | Maintenance‑free period (h) | >8000 | 6 | Boosting power (kW) | 7~11 |
| 7 | Operating voltage/frequency (V/Hz) | AC380/50 | 8 | Mixing ratio (%) | <5.8 |
Our rotor energy recovery and coaxial booster device offers the following competitive advantages over similar products:
Our device is an integrated energy recovery and booster unit, eliminating external piping connections, making installation and maintenance convenient, reducing leakage risk, occupying a small footprint, and simplifying construction and use of the complete system. It breaks the monopoly, replaces imports, increases the localization rate of seawater desalination projects, enhances the security of national strategic projects, and significantly reduces the cost of seawater desalination systems. As a local enterprise, delivery time and service are guaranteed.
Our company has made structural adjustments to the booster device, resulting in higher energy conversion efficiency and further reducing water production cost. Advanced materials, processes and design concepts enable full replacement of imported products and lower the total cost of desalination systems. As a local enterprise, delivery time and service are guaranteed.
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