KR20110100472A - Apparatus for recovering energy for desalinization system of sea-water - Google Patents

Abstract

The present invention is an energy recovery device of the seawater desalination system for delivering the residual pressure energy of the concentrated water generated in the membrane to the seawater sucked into the power recovery chambers (131, 132) by the low pressure seawater supply pipe, the power recovery chamber (131) A main valve means 140 having a piston and an inclined plate for selectively controlling the concentrated water entering and exiting the water, 132, a first concentrated water supply pipe 136 for supplying the concentrated water through the membrane to the main valve means; Auxiliary valve means 150 for selectively intermitting the concentrated water entering and exiting the main valve means to operate the main valve means, and a second concentrated water supply pipe 138 for supplying the concentrated water through the membrane to the auxiliary valve means. Equipped. According to this configuration, when the facility of the seawater desalination system is enlarged, the operation stability of the valve system is high, the power consumption is reduced, and the noise due to the change of the flow direction of the concentrated water is reduced.

Description

Apparatus for recovering energy for desalinization system of sea-water}

The present invention relates to an energy recovery apparatus of the seawater desalination system. More particularly, the present invention relates to an energy recovery apparatus for seawater desalination systems using reverse osmosis.

In general, to obtain fresh water from seawater, the dissolved or suspended components in seawater must be removed to meet the water and drinking water standards.

Such seawater desalination methods include reverse osmosis membrane method and electrodialysis method using a special membrane, evaporation method of desalination by converting seawater into steam, and other methods such as freezing and solar heat.

Recently, due to the increase in the price of fossil fuel and the development of high efficiency low energy seawater desalination equipment, the reverse osmosis membrane method and the electrodialysis method using the membrane are mainly used for seawater desalination. However, reverse osmosis is the only alternative for large-scale desalination plants.

The seawater desalination system by the reverse osmosis membrane method is a system that filters the ionic substances dissolved in seawater by using a semi-permeable membrane (membrane) through which pure water passes through, almost ionic substances dissolved in water are ionic. In order to separate the substance and pure water, high pressure energy of seawater osmotic pressure or more is required. The pressure at this time is called reverse osmosis, and seawater requires high pressure of 42 ~ 70 bar depending on salinity.

In the conventional seawater desalination system using reverse osmosis, as shown in FIG. 1, seawater drawn from the sea is stored in the raw water storage tank 12, and then sand filtering is performed in the pretreatment unit 14 to remove turbidity, and then supply. After being stored in the water bath 16, it is pumped by the low pressure pump 18.

Some of the pumped sea water is pressurized by the high pressure pump 22 and then supplied to the membrane 24, which is a reverse osmosis module, and discharged into the treated water from which salt is removed by reverse osmosis. The remaining sea water concentrated at high pressure is discarded. lost. Recently, an energy recovery device 26 has been developed to recover pressure energy from high pressure concentrated seawater. As shown in the dotted line in Fig. 1, the energy recovery device 26 is a key device of the reverse osmosis membrane desalination system.

The energy recovery device 26 pressurizes the seawater supplied by the low pressure pump 18 using the high pressure of the concentrated water supplied through the membrane 24 to provide the membrane 24 to the low pressure pump 18. And the capacity of the high pressure pump 22 can be reduced, or the power of the low pressure pump 18 and the electric motor driving the high pressure pump 22 can be reduced. At this time, the booster pump 28 is further provided to compensate for the pressure lost during the power recovery in the energy recovery device 26.

The energy recovery device 26 includes a pair of power recovery chambers 31 and 32 provided with pistons 31a and 32a, respectively, and a plurality of check valves that intercept seawater entering and exiting the power recovery chambers 31 and 32. And a drive spool valve 36 having an actuator for activating the pistons 31a and 32a in the power recovery chambers 31 and 32 alternately reciprocating.

However, when the facility of the seawater desalination system is enlarged, the driving spool valve of the energy recovery device also increases in size with the facility of the seawater desalination system, and the operation stability of the valve system is lowered. There was a problem that the power consumption used to change the flow direction also increases.

In addition, in the case of the driving spool valve method of the energy recovery device there is a problem that the noise due to water shock is severe due to the change in the periodic flow direction.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to increase the operation stability of the valve system when the facility of the seawater desalination system to increase the energy consumption of the seawater desalination system while reducing the power consumption and noise To provide.

The present invention for achieving the above object is in the energy recovery apparatus of the seawater desalination system for delivering the residual pressure energy of the concentrated water generated in the membrane to the seawater sucked into the power recovery chamber by a low pressure seawater supply pipe, the power recovery chamber A main valve means having a piston and an inclined plate to selectively control the entering and exiting concentrated water, a first concentrated water supply pipe for supplying the concentrated water through the membrane to the main valve means, and the main valve means to operate the main valve means. And an auxiliary valve means for selectively regulating the entering and exiting concentrated water, and a second concentrated water supply pipe for supplying the concentrated water through the membrane to the auxiliary valve means.

The main valve means is inclined by the inclined plate installed inside the housing and inclined according to the operation of the auxiliary valve means, and the concentrated water supplied through the first concentrated water supply pipe while being provided on one side of the inclined plate. A plurality of first pistons for selectively intercepting the concentrated water entering and exiting the power recovery chamber and a plurality of second inclined plates by the concentrated water supplied through the second concentrated water supply pipe provided on the other side of the inclined plate; It includes a piston.

A first cylinder portion in which the first piston slides is provided inside the housing, and a second cylinder portion in which the second piston slides is formed, and inside the first piston and the second piston, a flow space in which concentrated water flows. It is dug up to form.

A guide part is formed inside the housing to guide the inclined plate so that the inclined plate rotates smoothly.

A first inner flow passage through which the concentrated water is supplied from the first concentrated water supply pipe to the first piston is formed in one side of the housing, and the first inner flow passage includes a fluid silencer that reduces noise as the flow path is narrowed. It is.

The fluid silencer is configured to serve as a silencer by forming the first internal flow path by a large flow path formed in the housing and a plurality of small flow paths formed on an outer circumferential surface of the first piston to communicate with the large flow path.

The auxiliary valve means includes a first block having a valve connecting port communicating with a second cylinder portion of the main valve means, a second block having a supply port communicating with the second concentrated water supply pipe and a discharge port through which the concentrated water is discharged. And a valve flow path formed to change a flow path between the valve connection port, the supply port, and the discharge port, wherein the valve plate is provided between the first block and the second block.

The valve plate is a rotary plate valve, and further includes a drive motor for rotating the valve plate. The drive motor is an electric motor or a hydraulic motor, the hydraulic pressure for driving the hydraulic motor is supplied by the concentrated water supplied through the third concentrated water supply pipe.

According to the energy recovery apparatus of the seawater desalination system according to the present invention, by employing a main valve means having a piston and an inclined plate and an auxiliary valve means operated by concentrated water, and attaching a fluid silencer to the supply passage of the concentrated water supplied to the main valve means. In addition, when the facility of the seawater desalination system is enlarged, the operation stability of the valve system is high, the power consumption is reduced, and the noise due to the change of the flow direction of the concentrated water is reduced.

1 is a block diagram showing an energy recovery device of a conventional seawater desalination system;
2 is a block diagram showing an energy recovery apparatus of the seawater desalination system according to the first embodiment of the present invention;
3 is a detailed cross-sectional view showing the main valve means and the auxiliary valve means of FIG.
4 is a side view of the main valve means of FIG.
5 is a perspective view showing the auxiliary valve means of FIG.
6 and 7 is an operation state diagram of the energy recovery device of the seawater desalination system according to a first embodiment of the present invention,
8 is a block diagram showing an energy recovery apparatus of the seawater desalination system according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a block diagram showing a seawater desalination system using a reverse osmosis to which the first embodiment of the present invention is applied. As shown in the figure, the seawater desalination system to which the present invention is applied is then stored in the raw water storage tank 112 and the turbidity is removed by performing sand filtration in the pretreatment unit 114, and then the supply tank 116. After being stored in and pumped by the low pressure pump 118, some of the pumped seawater is pressurized by the high pressure pump 122 and then supplied to the membrane 124, which is a reverse osmosis module, to remove salts by reverse osmosis. Discharged into the water, the remaining sea water forms a system that is supplied to the energy recovery device 130 as concentrated water of high pressure. At this time, a booster pump 128 is further provided to increase the pressure of the pressurized seawater provided to the membrane 124.

The energy recovery device 130 is a device for transferring the residual pressure energy of the concentrated water generated in the membrane 124 to the seawater sucked into the power recovery chamber by the low pressure seawater supply pipe, the piston (131a, 132a) is provided respectively Seawater having a pair of power recovery chambers 131 and 132 and a plurality of check valves 133a, 133b, 133c, and 133d for controlling the seawater entering and exiting the power recovery chambers 131 and 132. Supply pipe 133, the main valve means 140 for converting the flow path so that the pistons (131a, 132a) in the power recovery chamber (131, 132) alternately reciprocating, and the auxiliary valve for operating the main valve means 140 The valve means 150 is provided.

The power recovery chambers 131 and 132 are formed in two pairs, but may be several in number if necessary. Hereinafter, the pair of power recovery chambers will be described as a first power recovery chamber 131 and a second power recovery chamber 132. On each side of the first power recovery chamber 131 and the second power recovery chamber 132, seawater ports 131b and 132b through which seawater is introduced and discharged are formed, and the first power recovery chamber 131 and Concentrated water ports 131c and 132c are formed at each other side of the second power recovery chamber 132 to allow inflow and outflow of concentrated water (concentrated water through a membrane).

The pistons 131a and 132b in the first and second power recovery chambers 131 and 132 are reciprocated in the first and second power recovery chambers 131 and 132 without a piston rod. While preventing the mixing of the high pressure concentrated water to transfer the pressure to the seawater serves to. In the present embodiment, the pistons 131a and 132b protrude convexly on the side of the concentrated water ports 131c and 132c and the pistons of the seawater ports 131b and 132b are concave and concavely recessed. The first and second power recovery chambers 131 and 132 may be formed of ball pistons or hemispherical pistons which respectively perform rolling motions, or may be formed of various types of pistons such as cylindrical pistons.

The seawater supply pipes 133 branched from both sides of the low pressure pump 118 to the seawater ports 131b and 132b form a waste flow path. The first and second check valves 133a and 133b and the third and fourth check valves 133c and 133d are installed in the seawater supply pipe 133 on the seawater ports 131b and 132b in opposite directions. Between the first check valve 133a and the second check valve 133b is in communication with the seawater port 131b of the first power recovery chamber and between the third check valve 133c and the fourth check valve 133d. Is in communication with the seawater port 132b of the second power recovery chamber. In addition, a seawater discharge tube 135 is connected between the second check valve 133b and the third check valve 133c to discharge seawater toward the membrane 124 through the booster pump 128.

The main valve means 140 is connected to a first concentrated water supply pipe 136 through which the high pressure concentrated water is supplied through the membrane 124, while the low pressure concentrated water is discharged from the main valve means 140 to an external flow path (not shown). The first concentrated water discharge pipe 137 discharged through is connected, the auxiliary valve means 150 is connected to the second concentrated water supply pipe 138 to which the high-pressure concentrated water is supplied through the membrane 124 while the In the auxiliary valve means 150, a second concentrated water discharge pipe 139 through which the low pressure concentrated water is discharged through an external flow path (not shown) is connected.

3 and 4, the main valve means 140 is installed in the housing 141 and is inclined according to the operation of the auxiliary valve means 150 and the inclined plate 142, the inclined plate 142 Is provided on one side (left side) of the inclined plate 142 by the concentrated water supplied through the first concentrated water supply pipe 136 while entering and exiting the first and second power recovery chambers 131 and 132. Upper and lower first pistons 143 and 144 for selectively cracking down the concentrated water and the other side (right side) of the inclined plate 142 to supply the second concentrated water supply pipe 138 (shown in FIG. 2). The upper and lower second pistons 145 and 146 tilt the inclined plate 142 by the concentrated water supplied therethrough.

In the interior (left) of the housing 141, upper and lower first cylinders 141a and 141b, in which the upper and lower first pistons 143 and 144 slide, are formed, and the housing 141 The upper and lower second cylinders 141c and 141d, which slide the upper and lower second pistons 145 and 146, are formed in the inside (right side), and the inclined plate 141 is formed in the middle of the housing 141. ), Upper and lower guide parts 141e and 141f are formed to guide the ends of the inclined plate 141 so as to smoothly rotate. The upper and lower guide parts 141e and 141f form an arcuate surface which the end of the inclined plate 141 is in contact with.

The first pistons 143 and 144 and the second pistons 145 and 146 form a recessed concave space portion 143a, 144a, 145a, and 146a so that one side thereof is open and a flow space in which the concentrated water flows is formed. Protruding rod portions 143b, 144b, 145b, and 146b are formed to contact the inclined plate 142 so as to push the inclined plate 142. In addition, a plurality of holes are formed in the outer circumferential surfaces of the end portions of the first pistons 143 and 144 to form first and second flow passages FS1 and FS2 (see FIG. 4) through which the concentrated water passes through the concave space portions 143a and 144a. 143c and 143d and 144c and 144d are formed. The holes 143c and 143d and the holes 144c and 144d are formed at positions shifted from each other in the longitudinal direction of the piston.

Guide parts (not shown) are formed in the first cylinder parts 141a and 141b so that the sliding first pistons 143 and 144 do not rotate. The first piston and the first cylinder may be formed in a rectangular cross-sectional shape so that the first piston does not rotate.

The inclined plate 142 is rotated at a predetermined angle with a central axis to the left and right directions of the housing 141. The inclined plate 142 is provided on both side surfaces 142 of the inclined plate 143b, 144b, and 145b. 146b) is formed with a curved guide surface concaved to be guided in contact with.

A first internal flow path H1 through which the concentrated water is supplied from the first concentrated water supply pipe 136 to the first pistons 143 and 144 is formed in one side (left side) of the housing 141. The internal passage H1 is provided with a fluid silencer that reduces noise as the passage narrows. The fluid silencer may be formed of a fluid silencer having a separate component inserted therein. In the present embodiment, the fluid silencer may be formed on the main passage FL formed in the housing 141 and on the outer circumferential surfaces of the first pistons 143 and 144. The first internal passage H1 is formed by the first passage FS1 communicating with the large passage FL to serve as a silencer.

In addition, the concave spaces 143a and 144a and the second channel FS2 of the first pistons 143 and 144 also form a fluid silencer as the flow path is narrowed.

In addition, the first concentrated water supply port 136 is connected to one side (left side) of the housing 141 so that the high-pressure concentrated water flows in and communicates with the first internal flow path H1 ( PH1 is formed, and first and second connection ports PC1 and PC2 are formed to communicate with the concentrated water ports 131c and 132c of the first and second power recovery chambers 131 and 132 by a connecting pipe. The first concentrated water discharge ports PL1 and PL2 are connected to the first concentrated water discharge pipe 137 so that the low pressure concentrated water flowing out from the first and second power recovery chambers 131 and 132 is discharged. do. In addition, on the other side (right side) of the housing 141, third and fourth connection ports PC3 and PC4 communicating with the valve connection ports described later of the auxiliary valve means 150 are formed.

3 and 5, the auxiliary valve means 150 is connected to the first and second valves communicating with the second cylinder portions 141c and 141d of the main valve means 140 by connecting pipes, respectively. A first block 151 having ports 151a and 151b formed therein, a second concentrated water supply port 152a communicating with the second concentrated water supply pipe 138, and the second concentrated water discharge pipe 139 to discharge concentrated water; A second block 152 having a second concentrated water discharge port 152b communicating therewith, the first and second valve connection ports 151a and 151b, the second concentrated water supply port 152a, and the Valve plates provided between the first block 151 and the second block 152 by forming first and second valve flow paths 153a and 153b to change the flow path between the second concentrated water discharge ports 152b. 153).

The valve plate 153 is a rotary plate valve, and the valve plate 153 is driven (rotated) by a drive motor 154 which is an electric motor. The first and second valve flow paths 153a and 153b formed in the valve plate 153 are formed in an arc-shaped band groove shape so that the flow direction of the concentrated water changes according to the rotation of the valve plate 153.

In the energy recovery apparatus of the seawater desalination system according to the first embodiment of the present invention configured as described above, as shown in FIG. 6 (the auxiliary valve means is shown rotated by 90 °) to drive the drive motor 154. Accordingly, the valve plate 153 rotates so that the second concentrated water supply port 152a and the first valve connection port 151a communicate with the first valve flow path 153a, and the second concentrated water discharge port 152b is formed. When the two-valve connection port 151b communicates with the second valve flow passage 153b, the high pressure concentrated water flowing into the auxiliary valve means 150 along the second concentrated water supply pipe 138 via the membrane 124 is The second concentrated water supply port 152a, the first valve flow path 153a, and the first valve connecting port 151a through a connecting pipe through a third connecting port PC3 of the main valve means 140 through a connecting pipe; It flows into the 2 cylinder part 141c.

Accordingly, the upper second piston 145 is moved to the left side so that the inclined plate 142 is rotated by a predetermined angle (about 25 °) in the counterclockwise direction and inclined, and the upper first piston 143 on the opposite side of the inclined plate 142. Will be pushed to the left. At the same time, the lower first piston 144 and the lower second piston 146 move to the right side, and the low pressure concentrated water in the lower second cylinder portion 141c moves the fourth connection port PC4. Through the second concentrated water discharge pipe 139 via the second valve connecting port 151b and the second valve flow path 153b and the second concentrated water discharge port 152b of the auxiliary valve means 150 along the connecting pipe. Discharged.

On the other hand, when the inclined plate 142 is rotated counterclockwise to the inclined state, the first internal flow path (H1) communicates with the lower first cylinder portion (141b) and the first concentrated water discharge port (PL1) It communicates with the upper 1st cylinder part 141a.

Therefore, the high pressure concentrated water flowing into the main valve means 150 along the first concentrated water supply pipe 136 via the membrane 124 may be connected to the first concentrated water supply port PH1 and the first internal flow path H1 and the lower side. Flows out through the first cylinder portion 141b and the first connection port PC1 and flows into the right space of the piston 131a through the concentrated water port 131c of the first power recovery chamber 131 along the connection pipe. The piston 131a moves to the left side (A direction). When the concentrated water flows into the main valve means 150, the noise is reduced while the concentrated water passes from the large flow path FL of the first internal flow path H1 to the first flow passages FS1 and 144c to reduce noise. do.

By this action, the seawater of the low pressure in the left space of the piston 131a of the first power recovery chamber 131 is compressed to sequentially discharge the seawater discharge pipe through the seawater port 131b and the second check valve 133b. Via the booster pump 128 to the membrane 124.

Then, the piston (by the low pressure seawater introduced into the left space of the piston 132a of the second power recovery chamber 132 through the fourth check valve 133d and the seawater port 132b provided in the seawater supply pipe 133). 132a moves to the right side (B direction).

Accordingly, the low pressure concentrated water in the right space of the piston 132a of the second power recovery chamber 132 flows out through the concentrated water port 132c and is connected to the second connection port PC2 of the main valve means 140 through a connecting pipe. Inflow into the first cylinder portion 141a of the upper side through a) and is discharged to the external flow path (not shown) along the first concentrated water discharge port (PL1) and the first concentrated water discharge pipe (137). At this time, while the concentrated water of low pressure passes through the second oil passages FS2 and 143d in the first cylinder portion 141a, a noise reduction effect occurs and noise is reduced.

As shown in FIG. 7 (the auxiliary valve means is shown rotated by 90 °), the valve plate 153 is further rotated in accordance with the driving of the driving motor 154 to supply the second concentrated water supply port 152a. And the second valve connection port 151b communicate with the first valve flow passage 153a, and the second concentrated water discharge port 152b and the first valve connection port 151a communicate with the second valve flow passage 153b. When the high pressure concentrated water flowing into the auxiliary valve means 150 through the second concentrated water supply pipe 138 through the membrane 124 is formed, the second concentrated water supply port 152a and the first valve flow path 153a and Through the second valve connection port 151b is introduced into the lower second cylinder portion 141d through the fourth connection port PC4 of the main valve means 140 through a connecting pipe.

Therefore, the lower second piston 146 moves to the left side, and the inclined plate 142 rotates clockwise at a predetermined angle (about 25 °) to incline and lower the first piston 144 opposite the inclined plate 142. It will be pushed to the left. At the same time, the first piston 143 on the upper side and the second piston 145 on the upper side move to the right side, and the low pressure concentrated water in the second cylinder portion 141c on the upper side is connected to the third connection port PC3. It is discharged through the second concentrated water discharge pipe 139 via the first valve connection port 151a, the second valve flow path 153b and the discharge port 152b of the auxiliary valve means 150 through the connection pipe.

On the other hand, when the inclined plate 142 is rotated in a clockwise direction to the inclined state, the first internal flow path (H1) communicates with the upper first cylinder portion (141a) and the first concentrated water discharge port (PL2) is lower Communicates with the first cylinder portion 141b.

Therefore, the high pressure concentrated water flowing into the main valve means 150 along the first concentrated water supply pipe 136 via the membrane 124 is upper side of the first concentrated water supply port PH1 and the first internal flow path H1. Flows out through the first cylinder portion 141a and the second connection port PC2 and flows into the right space of the piston 132a through the concentrated water port 132c of the second power recovery chamber 132 along the connection pipe. The piston 132a moves to the left side (D direction). When the concentrated water flows into the main valve means 150, the noise is reduced while the concentrated water passes from the large passage FL of the first internal passage H1 to the first holding passages FS1 and 143c, thereby reducing noise. do.

By this action, the seawater of low pressure in the left space of the piston 132a of the second power recovery chamber 132 is compressed to sequentially pass through the seawater port 132b and the third check valve 133c. Via the booster pump 128 to the membrane 124.

Then, the piston (by the low pressure seawater introduced into the left space of the piston 131a of the first power recovery chamber 131 through the first check valve 133a and the seawater port 131b provided in the seawater supply pipe 133). 131a moves to the right side (C direction).

Therefore, the low pressure concentrated water in the right space of the piston 131a of the first power recovery chamber 131 flows out through the concentrated water port 131c, and the first connection port PC1 of the main valve means 140 through the connection pipe. Inflow into the first cylinder portion (141b) of the lower side through the) is discharged to the external flow path (not shown) along the first concentrated water discharge port (PL2) and the first concentrated water discharge pipe (137). At this time, while the concentrated water of low pressure passes through the second oil passages FS2 and 144d in the first cylinder portion 141b, a noise reduction effect occurs and noise is reduced.

Next, as the driving motor 154 is driven, the valve plate 153 is further rotated so that the second concentrated water supply port 152a and the first valve connection port 151a communicate with each other by the second valve flow path 153b. When the second concentrated water discharge port 152b and the second valve connection port 151b communicate with each other by the first valve flow path 153a, a flow path as shown in FIG. 6 is formed and operates.

Next, as the drive motor 154 is driven, the valve plate 153 is further rotated so that the second concentrated water supply port 152a and the second valve connection port 151b communicate with each other by the second valve flow path 153b. When the second concentrated water discharge port 152b and the first valve connection port 151a communicate with each other by the first valve flow path 153a, a flow path as shown in FIG. 7 is formed and operates.

As described above, the auxiliary valve means 150 takes the flow path form consisting of four steps sequentially and repeatedly according to one rotation of the valve plate 153 as the valve plate 153 rotates by the driving motor 154. Accordingly, the high pressure concentrated water is introduced into the first power recovery chamber 131 and the second power recovery chamber 132, and the concentrated water is discharged at a low pressure.

Figure 8 is a block diagram showing a seawater desalination system using a reverse osmosis to which the second embodiment of the present invention is applied. In this embodiment, the drive motor 254 for driving the valve plate in the auxiliary valve means 250 is a hydraulic motor, the hydraulic pressure for driving the drive motor 254 is a hydraulic pressure supply pipe 255 in communication with the membrane 124. The drive motor 254 is controlled by a pressure sensor and a control means (not shown).

Since the rest of the configuration of the second embodiment is the same as that of the first embodiment, the same reference numerals as in the first embodiment will be given, and detailed description thereof will be omitted.

130: energy recovery apparatus 131, 132: first and second power recovery chamber
133: seawater supply pipe 136: first concentrated water supply pipe
137: first concentrated water discharge pipe 138: second concentrated water supply pipe
139: second concentrated water discharge pipe 140: main valve means
141: housing 142: inclined plate
143, 144: first piston 145, 146: second piston
150, 250: auxiliary valve means 151: first block
152: second block 153: valve plate
154, 254: drive motor 255: hydraulic pressure supply pipe
H1: First internal flow path FL: Large flow path
FS1, FS2: Own PC1, PC2: 1st, 2nd connection port
PC3, PC4: 3rd and 4th connection ports PH1: 1st concentrated water supply port
PL1, PL2: first concentrated water discharge port

Claims (10)

In the energy recovery device of the seawater desalination system for delivering the residual pressure energy of the concentrated water generated in the membrane to the seawater sucked into the power recovery chamber by the low pressure seawater supply pipe,
A main valve means having a piston and an inclined plate for selectively controlling concentrated water entering and exiting the power recovery chamber;
A first concentrated water supply pipe for supplying the concentrated water through the membrane to the main valve means;
Auxiliary valve means for selectively intermitting the concentrated water entering and exiting the main valve means to operate the main valve means;
And a second concentrated water supply pipe for supplying the concentrated water through the membrane to the auxiliary valve means. The method according to claim 1,
The main valve means,
An inclined plate installed inside the housing and inclined according to the operation of the auxiliary valve means;
A plurality of first pistons provided at one side of the inclined plate to tilt the inclined plate by the concentrated water supplied through the first concentrated water supply pipe and to selectively control the concentrated water entering and exiting the power recovery chamber;
And a plurality of second pistons provided on the other side of the inclined plate to incline the inclined plate by the concentrated water supplied through the second concentrated water supply pipe. The method according to claim 2,
The first cylinder portion in which the first piston slides and the second cylinder portion in which the second piston slides are formed in the housing.
The energy recovery device of the desalination system of the seawater desalination system, characterized in that the interior of the first piston and the second piston is formed so as to form a flow space in which the concentrated water flows. The method according to claim 2,
The energy recovery device of the seawater desalination system, characterized in that the guide portion for guiding the inclined plate is formed in the housing to smoothly rotate the inclined plate. The method according to claim 2,
A first internal flow path is formed inside one side of the housing to supply concentrated water from the first concentrated water supply pipe to the first piston.
The energy recovery device of the seawater desalination system, characterized in that the first internal passage is provided with a fluid silencer that reduces the noise as the passage narrows. The method according to claim 5,
The fluid silencer,
A large flow path formed in the housing,
The energy recovery device of the seawater desalination system formed on the outer circumferential surface of the first piston to form the first inner flow path by a plurality of small flow passages communicating with the large flow passage to serve as a silencer. The method according to claim 2,
The auxiliary valve means,
A first block having a valve connection port communicating with the main valve means;
A second block having a second concentrated water supply port communicating with the second concentrated water supply pipe and a second concentrated water discharge port through which the concentrated water is discharged;
A valve flow path is formed to change a flow path between the valve connection port, the second concentrated water supply port, and the second concentrated water discharge port, and comprises a valve plate provided between the first block and the second block. Energy recovery device for seawater desalination system. The method according to claim 7,
An energy recovery apparatus of the seawater desalination system, further comprising a drive motor for rotating the valve plate. The method according to claim 8,
The drive motor is an energy recovery device of the seawater desalination system, characterized in that the electric motor or a hydraulic motor. The method according to claim 9,
The hydraulic pressure driving the hydraulic motor is supplied through a hydraulic pressure supply pipe in communication with the membrane energy recovery device of the seawater desalination system.

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