# US 12,179,150 B2 · Pressure exchanger unit for saving energy in desalination plants

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- Number: US 12,179,150 B2
- Document ID: US12179150B2
- Status: Granted
- Kind: B2
- Application number: 17/437,550
- Filed: 2019-03-26
- Published: 2022-05-19
- Granted: 2024-12-31
- Earliest claimed: 2019-03-26
- Assignees: Mohamed Abdelwahab Wahby Swidan
- Applicants: Mohamed Abdelwahab Wahby Swidan
- Inventors: Mohamed Abdelwahab Wahby Swidan
- Web page: https://patentgrep.com/patent/US12179150B2

## CPC

- B01D 61/06: Energy recovery
- F04F 13/00: Pressure exchangers
- Y02A 20/131: Reverse-osmosis
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- F04F: PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED {(evacuating by sorption F04B)}; SIPHONS {(conveying materials in bulk by flows of gas, liquid of foam B65G53/00)}
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

The present invention relates to a energy recovery unit in desalination plants or other applications as (oil & gas), wherein the energy of the pressure exchanger PE is provided by the exchange of pressure between the 1st fluid, which can be the high-pressure concentrated water from the desalination plant output, and the 2nd fluid, which can be the low-pressure feeding water to the desalination plants, wherein the 1st fluid enters into the pressure exchanger through HPI and the pressure is transferred to the 2nd fluid through the pressure exchanger. Thus, the pressure of the 2nd flow is raised and pushed through HPO to RO desalination membrane. The course of this cycle is as follows: (HPI/E/44/X45/46/C/55/X56/57/A/HPO) and 2nd fluid is entered into pressure exchanger through LPI and 1st fluid is swiped out with low pressure (after exchanging pressure with 2nd fluid) from the pressure exchanger through LPO. The course of this cycle is as follows: (LPI/A/54/X52/Y52/Z52/51/C/47/Z48/Y48/X48/50/E/LPO). PE consists of stationary cylinder “C” and rotating disc “A,B,D&E”.

## Claims

### Claim 1

A fluid pressure exchanger for converting a first high-pressure fluid stream to a second low-pressure fluid stream and a first low-pressure fluid stream to a second high-pressure fluid stream, the fluid pressure exchanger comprises a stator cylinder, side rotary discs, side-end casings, and a source of rotor motion;
wherein the side rotary discs comprise at least a first rotary disc and a second rotary disc;
longitudinal tubes in which pressure is exchanged between the first high-pressure fluid and the first low-pressure fluid;
wherein the first rotary disc and the second rotary disc are connected by a rotor shaft;
wherein the first rotary disc is covered by a first end casing, the first end casing having an inlet for entrance of the first high-pressure fluid and a first outlet for exit of the second low-pressure fluid stream;
wherein the second rotary disc is covered by a second end casing, the second end casing having a second inlet for the entrance of the low-pressure fluid and a second outlet for the exit of the second high-pressure fluid stream;
wherein the front face of the first rotary disc is provided with an internal circular channel, and an external circular channel, wherein the internal circular channel and the external circular channel are arranged in concentric spaced circles, the center thereof is the center of the front face of the first rotary disc;
wherein the back face of the first rotary disc is provided with an upper semi-circular channel opposing a lower semi-circular channel;
wherein the front face of the second rotary disc is provided with an internal circular channel and an external circular channel wherein said internal circular channel and said external circular channel are arranged in concentric spaced circles, the center thereof is the center of the front face of the second rotary disc;
wherein the back face of the second rotary disc is provided with an upper semi-circular channel opposing a lower semi-circular channel;
wherein the external circular channel of the front face of the first rotary disc, and the upper semicircular channel of the back face of the first rotary disc are connected via at least one hole;
wherein the internal circular channel of the front face of the first rotary disc is connected to the lower semicircular channel of the back face of the first rotary disc via at least one duct, wherein the at least one duct has an open end in the internal circular channel of the front face of the first rotary disc and another open end in the lower semi-circular channel of the back face of the first rotary disc;
wherein the external circular channel of the front face of the second rotary disc, and the upper semicircular channel of the back face of the second rotary disc is connected via at least one hole; and
wherein the internal circular channel of the front face of the second rotary disc, and the lower semicircular channel of the back face of the second rotary disc is connected via at least one duct, wherein the at least one duct has an open end in the internal circular channel of the front face of the second rotary disc, and another open end in the lower semicircular channel of the back face of the second rotary disc.

### Claim 2 (depends on 1)

The pressure exchanger according to claim 1, wherein the source of the rotor motion is an external motor that is coupled to the rotor shaft.

### Claim 3 (depends on 1)

The pressure exchanger according to claim 1, wherein the source of rotor motion comprises third and forth rotary discs.

### Claim 4 (depends on 3)

The fluid pressure exchanger according to claim 3, wherein each of the third rotary disc and the fourth rotary disc having an internal plurality of holes and an external plurality of holes, arranged in two spaced concentric circles, wherein the external plurality of holes is configured for passing the first or second high pressure stream, and the internal plurality of holes is configured for passing the first or second low pressure stream.

### Claim 5 (depends on 4)

The fluid pressure exchanger according to claim 4, wherein the external plurality of holes of the third rotary disc is opposing the external circular channel of the front face of the first rotary disc, and the internal plurality of holes of the third rotary disc is opposing the internal circular channel of the front face of the first rotary disc.

### Claim 6 (depends on 4)

The fluid pressure exchanger according to claim 4, wherein the external plurality of holes of the fourth rotary disc is opposing the external circular channel of the front face of the second rotary disc, and the internal plurality of holes of the fourth rotary disc is opposing the internal circular channel of the front face of the second rotary disc.

### Claim 7 (depends on 4)

The fluid pressure exchanger according to claim 4, wherein the first high-pressure fluid stream passes through the external plurality of holes of the third rotary disc with an inclination angle, causing the rotation of the third rotary disc; and
wherein the first low-pressure fluid stream passes through the internal plurality of holes of the fourth rotary disc with an inclination angle, causing the rotation of the fourth rotary disc;
wherein the rotation of the third rotary disc and the fourth rotary disc causes the rotation of the rotor shaft, and consequently rotates the first and second rotary discs.

### Claim 8 (depends on 1)

The pressure exchanger according to claim 1, wherein the front face of the first rotary disc is manufactured as a separate disc, and the back face of the first rotary disc is manufactured as a separate disc, then the two separate discs are assembled; and
wherein the front face of the second rotary disc is manufactured as a separate disc, and the back face of the second rotary disc is manufactured as a separate disc, then the two separate discs are assembled.

### Claim 9 (depends on 1)

The pressure exchanger according to claim 1, wherein the stator cylinder contains a central channel, through which the rotor shaft passes, without rotation of the stator cylinder.

### Claim 10 (depends on 1)

The pressure exchanger according to claim 1, each of the longitudinal tubes contains a free piston for the purpose of pressure exchange without direct contact between the fluids; and,
wherein each free piston moves freely within the longitudinal tube thereof, and each longitudinal tube contains bumpers that prevent the piston from escaping thereout.

### Claim 11 (depends on 1)

The pressure exchanger according to claim 1, wherein the stator cylinder part and side rotor discs are manufactured from a material non-permeable to water.

### Claim 12 (depends on 1)

The pressure exchanger according to claim 1, wherein extension parts of the stator cylinder are added or the middle part of the stator cylinder is replaced by a plurality of outer tubes or to increase the length of the stator cylinder.

### Claim 13 (depends on 1)

The pressure exchanger according to claim 1, wherein the external circular channel of the front face of the first rotary disc, and the upper semicircular channel of the back face of the first rotary disc are connected via a plurality of holes; and
wherein the internal circular channel of the front face of the first rotary disc is connected to the lower semicircular channel of the back face of the first rotary disc via a plurality of ducts.

### Claim 14 (depends on 13)

The pressure exchanger according to claim 13, wherein the plurality of holes that connects the external circular channel of the front face of the first rotary disc with the upper semicircular channel of the back face of the first rotary disc are merged resulting in merging the upper portion of the external circular channel of the front face to the upper semicircular channel of the back face of the first disc as one channel; and
wherein the plurality of ducts, that connects the internal circular channel of the front face of the first rotary disc is connected to the lower semicircular channel of the back face, are merged in one duct.

### Claim 15 (depends on 1)

The pressure exchanger according to claim 1, wherein the external circular channel of the front face of the second rotary disc, and the upper semicircular channel of the back face of the second rotary disc is connected via a plurality of holes; and
wherein the internal circular channel of the front face of the second rotary disc, and the lower semicircular channel of the back face of the second rotary disc is connected via a plurality of ducts.

### Claim 16 (depends on 15)

The pressure exchanger according to claim 15, wherein the plurality of holes that connects the external circular channel of the front face of the second rotary disc, and the upper semicircular channel of the back face of the second rotary disc, are merged, resulting in merging the upper portion of the external circular channel of the front face to the upper semicircular channel of the back face of the second disc as one channel; and
wherein the plurality of ducts, that connects the internal circular channel of the front face of the second rotary disc to the lower semicircular channel of the back face of the second rotary disc, are merged in one duct.