Desalination Energy Recovery Device for Efficient Pressure Energy Conversion

The desalination energy recovery device is a core energy-saving component in reverse osmosis seawater desalination systems. It recovers residual pressure energy from high-pressure brine discharge and directly transfers it to incoming fresh seawater, significantly reducing the power consumption of the high-pressure pump. This device primarily utilizes pressure exchanger energy recovery technology. Through efficient "pressure energy to pressure energy" conversion without phase change, the overall system energy consumption is reduced, making it a key technology for promoting the large-scale and low-carbon development of seawater desalination.

Specification
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Specification

iERD Series – Integrated Exchanger and Booster
iMPE Series – Active Pressure Energy Recovery

The iERD series desalination energy recovery device is designed for reverse osmosis seawater desalination systems of all sizes (including land-based, offshore, and mobile applications), ensuring stable membrane feed water flow under various operating conditions. This series equipment achieves an energy recovery efficiency of up to 92%. By directly transferring the residual high-pressure energy from the reverse osmosis wastewater to the feed water side, without requiring an additional high-pressure flow meter, it significantly reduces system energy consumption. The iERD is the industry's first 3-in-1 isobaric energy recovery system, integrating a rotary isobaric pressure exchanger, a high-pressure booster pump, and an electric motor.

iERD Series Catalogue

Specifications

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Table 1: iERD Series Desalination Energy Recovery Device Specifications
Type		iERD 21 Plus	iERD 40	iERD 50	iERD 70	iERD 90
Flow range	m³/h	6–22	21–41	42–52	50–70	70–90
Flow range	gpm	26–96	92–181	184–228	220–308	308–396
Max. outlet pressure	barg	83	83	83	83	70
Max. outlet pressure	psig	1203	1203	1203	1203	1015
Max. differential pressure:	barg	5	5	5	5	5
Max. differential pressure:	psig	72	72	72	72	72
Speed	rpm	500–1500	600–1200	525–650	625–875	625–875

The iMPE, constructed from a combination of stainless steel and polymer materials, is an active pressure energy recovery device designed for seawater desalination and industrial zero liquid discharge applications, offering several technical advantages. Its intelligent design eliminates the risk of rotor over-speeding, reduces mixing, and ensures efficient rotor operation even under step-out and torque impact conditions, thereby improving energy recovery efficiency, control performance, and system reliability. Moreover, the iMPE reduces the need for redundant traditional ERD configurations in large-scale plants, effectively lowering overall costs.

Furthermore, this device establishes a solid foundation for intelligent and automated systems, as well as more proactive maintenance.

iMPE Series Catalogue

A seawater desalination energy recovery device placed at an angle

Specifications

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Table 2: iMPE Series Desalination Energy Recovery Device Specifications
Type	Flow	Maximum Outlet Pressure	(Hp In-Hp Out) max.	(Lp In-Lp Out) max.	Speed
iMPE 21	6–22 m³/h	1203 psig	0.66 barg	0.8 barg	500–1500 rpm
iMPE 21	26–96 gpm	1203 psig	9.6 psig	11.6 psig	500–1500 rpm
iMPE 40	21–41 m³/h	1203 psig	0.7 barg	0.8 barg	600–1200 rpm
iMPE 40	92–181 gpm	1203 psig	10.15 psig	11.6 psig	600–1200 rpm
iMPE 50	42-52 m³/h	1203 psig	0.7 barg	0.8 barg	525–650 rpm
iMPE 50	184–228 gpm	1203 psig	10.15 psig	11.6 psig	525–650 rpm
iMPE 70	50–70 m³/h	1203 psig	0.7 barg	0.8 barg	625–875 rpm
iMPE 70	220–308 gpm	1203 psig	10.15 psig	11.6 psig	625–875 rpm
iMPE 90	70–90 m³/h	1203 psig	0.7 barg	0.8 barg	625–875 rpm
iMPE 90	308–396 gpm	1203 psig	10.15 psig	11.6 psig	625–875 rpm
iMPE 110	80–110 m³/h	1203 psig	1 barg	1 barg	625–875 rpm
iMPE 110	352–484 gpm	1203 psig	14.5 psig	14.5 psig	625–875 rpm
iMPE 140	100–140 m³/h	1203 psig	1 barg	1 barg	625–875 rpm
iMPE 140	440–616 gpm	1203 psig	14.5 psig	14.5 psig	625–875 rpm
iMPE 21H	6–22 m³/h	120 barg	1 barg	1 barg	500–1500 rpm
iMPE 21H	26–96 gpm	1740 psig	14.5 psig	14.5 psig	500–1500 rpm
iMPE 40 H	21–41 m³/h	120 barg	1 barg	1 barg	600–1200 rpm
iMPE 40 H	92–181 gpm	1740 psig	14.5 psig	14.5 psig	600–1200 rpm
iMPE 50 H	42–52 m³/h	120 barg	1 barg	1 barg	525–650 rpm
iMPE 50 H	184–228 gpm	1740 psig	14.5 psig	14.5 psig	525–650 rpm
iMPE 70 H	50–70 m³/h	120 barg	1 barg	1 barg	625–875 rpm
iMPE 70 H	220–308 gpm	1740 psig	14.5 psig	14.5 psig	625–875 rpm
iMPE 90H	70–90 m³/h	120 barg	1 barg	1 barg	625–875 rpm
iMPE 90H	308–396 gpm	1740 psig	14.5 psig	14.5 psig	625–875 rpm
iMPE 50L	42–52 m³/h	8–20 barg	0.7 barg	0.8 barg	525–650 rpm
iMPE 50L	184–228 gpm	116–290 psig	10.15 psig	11.6 psig	525–650 rpm
iMPE 70L	50–70 m³/h	8–20 barg	0.7 barg	0.8 barg	625–875 rpm
iMPE 70L	220–308 gpm	116–290 psig	10.15 psig	11.6 psig	625–875 rpm
iMPE 90L	70–90 m³/h	8–20 barg	0.7 barg	0.8 barg	625–875 rpm
iMPE 90L	308–396 gpm	116–290 psig	10.15 psig	11.6 psig	625–875 rpm
iMPE 110L	80–110 m³/h	8–20 barg	0.7 barg	0.8 barg	625–875 rpm
iMPE 110L	352–484 gpm	116–290 psig	10.15 psig	11.6 psig	625–875 rpm
iMPE 140L	100–140 m³/h	8–20 barg	0.7 barg	0.8 barg	625–875 rpm
iMPE 140L	440–616 gpm	116–290 psig	10.15 psig	11.6 psig	625–875 rpm