Reverse osmosis system

Patent metadata

Field	Value
Publication number	US-9416795-B2
Application number	US-200913060736-A
Country	US
Kind code	B2
Filing date	Aug 28, 2009
Priority date	Aug 29, 2008
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

The invention concerns a reverse osmosis system ( 1 ) with a membrane unit ( 2 ) comprising an inlet ( 3 ), a permeate outlet ( 4 ) and a concentrate outlet ( 5 ), a high-pressure pump ( 8 ) that is connected to the inlet ( 3 ), a pressure exchanger ( 11 ) connected on its concentrate side ( 10 ) to the concentrate outlet ( 5 ), and a booster pump between the pressure exchanger ( 11 ) and the inlet ( 3 ). It is endeavored to make the energy consumption as small as possible. For this purpose, the booster pump is made as a displacement pump.

First claim

What is claimed is:

1. A reverse osmosis system with a membrane unit comprising an inlet, a permeate outlet and a concentrate outlet, a high-pressure pump that is connected to the inlet, a pressure exchanger connected on its concentrate side to the concentrate outlet, and a booster pump that is a displacement pump having its inlet connected to a high-pressure feed water connection of the pressure exchanger and its outlet connected to the inlet of the membrane unit, the booster pump boosting pressure of, and acting directly upon the feed water exiting the pressure exchanger through the high-pressure feed water connection to correspond to a pressure of feed water exiting the high-pressure pump, wherein the pressure exchanger and the displacement pump have a common drive shaft and mutually adapted throughput volumes.

2. The reverse osmosis system according to claim 1 , wherein a measuring motor is arranged between the concentrate outlet and the pressure exchanger.

3. The reverse osmosis system according to claim 1 , wherein the displacement pump is made as a variable displacement pump.

4. The reverse osmosis system according to claim 3 , wherein a concentrate sensor is connected in series after the displacement pump, said concentrate sensor being connected to an adjustment device of the displacement pump.

5. The reverse osmosis system according to claim 1 , wherein the displacement pump and the pressure exchanger have a common shaft sealing area.

6. The reverse osmosis system according to claim 1 , wherein the displacement pump has a pump inlet at a front side, with which it is arranged at the pressure exchanger.

7. The reverse osmosis system according to claim 6 , wherein the pump inlet is placed opposite an inlet (HPC) of the pressure exchanger.

8. The reverse osmosis system according to claim 1 , wherein the high-pressure pump has a common drive shaft with the displacement pump.

9. The reverse osmosis system according to claim 8 , wherein the high-pressure pump, the pressure exchanger and the displacement pump are combined into one component.

10. The reverse osmosis system according to claim 9 , wherein the displacement pump is arranged between the pressure exchanger and the high-pressure pump.

11. The reverse osmosis system according to claim 10 , wherein the displacement pump and the high-pressure pump have a common outlet (HPFB) from the component.

12. The reverse osmosis system according to claim 1 , wherein the concentrate side of the pressure exchanger has a concentrate influencing arrangement that comprises at least one of the following elements: a bypass valve, a pressure relief valve and a throttle valve.

13. The reverse osmosis system according to claim 1 , wherein a safety valve is arranged in parallel to the displacement pump.

14. A reverse osmosis system with a membrane unit comprising an inlet, a permeate outlet and a concentrate outlet, a high-pressure pump that is connected to the inlet, a pressure exchanger connected on its concentrate side to the concentrate outlet, a booster pump that is a displacement pump having its inlet connected to a high-pressure feed water connection of the pressure exchanger and its outlet connected to the inlet of the membrane unit, the booster pump boosting pressure of, and acting directly upon the feed water exiting the pressure exchanger through the high-pressure feed water connection to correspond to a pressure of feed water exiting the high-pressure pump, and a concentrate sensor connected in series after the displacement pump and before the membrane unit, said concentrate sensor being connected to an adjustment device of the displacement pump, wherein the pressure exchanger and the displacement pump have a common drive shaft and mutually adapted throughput volumes.

Assignees

• Friedrichsen Welm
• Olsen Palle
• Haugaard Erik
• Danfoss As

Inventors

• Friedrichsen Welm
• Olsen Palle
• Haugaard Erik

Classifications

• B01D61/025

  Reverse osmosis; Hyperfiltration · CPC title

• B01D61/10

  Accessories; Auxiliary operations · CPC title

• Y02A20/131

  Reverse-osmosis · CPC title

• B01D2311/246

  Concentration control · CPC title

• B01D2313/243

  Pumps · CPC title