WO2011108783A1

WO2011108783A1 - Energy recovery device for seawater desalination system

Info

Publication number: WO2011108783A1
Application number: PCT/KR2010/004793
Authority: WO
Inventors: 최준혁; 전상규; 김현식; 정기철
Original assignee: 효성굿스프링스 주식회사
Priority date: 2010-03-04
Filing date: 2010-07-21
Publication date: 2011-09-09
Also published as: KR20110100471A

Abstract

The present invention relates to an energy recovery device in a seawater desalination system. More particularly, the energy recovery device for a seawater desalination system, delivers pressure energy remaining in condensed water, generated by a membrane, through a low-pressure seawater supply pipe, to seawater that is aspirated into a power recovery chamber, and comprises: a rotor block (150), having an internal passage that selectively controls the condensed water, which passes through the power recovery chamber; a housing (160), which is mounted on the exterior of the rotor block and connects intermittently to an external passage; and fixing blocks (141, 142) to which the rotor block and housing are installed. The device having the above configuration has effective of increase in energy recovery rate, due to a simplified structure that reduces cost and prevents leakage.

Description

Energy recovery device of seawater desalination system

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, as well as freezing method and solar thermal method.

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 seawater 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 salts are removed by reverse osmosis. lost. Recently, an energy recovery device 26 has been developed to recover pressure energy from high pressure concentrated seawater. As indicated by the dashed 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. (34) and a drive spool valve (36) having an actuator for activating the piston in the power recovery chambers (31, 32) to reciprocate alternately.

However, in the energy recovery device of the conventional seawater desalination system, the driving spool valve is provided with a separate actuator. Therefore, additional equipment for driving the actuator is required, and a large amount of energy is consumed for driving the actuator. In addition, the drive spool valve in the energy recovery device of the conventional seawater desalination system is difficult to prevent leakage in the valve is low energy efficiency due to leakage, causing a large noise and vibration by the flow pulsation generated during the spool drive. In addition, there is a problem in that a very large spool valve is required to directly drive the flow path.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide an energy recovery apparatus of the seawater desalination system that has a simple structure, saves cost, reduces consumption power, prevents leakage and increases energy efficiency. There is.

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 It includes a rotary block having an internal flow path for selectively intercepting the concentrated water entering and exit, and a housing provided on the outside of the rotary block to be intermittently connected to the external flow path.

The rotary block has a high pressure inlet formed on the side (rotational axis direction) to allow the high pressure concentrated water to enter and a high pressure outlet formed on the outer circumferential surface, and a low pressure inlet formed on the outer circumferential surface and a low pressure outlet formed on the side to allow the low pressure concentrated water to enter and exit. The housing is provided with a plurality of connectors communicating with the high pressure outlet and the low pressure inlet in accordance with the rotation angle of the rotary block to selectively connect the internal passage and the external passage.

The outer surface of the rotary block is formed with a flow path groove along the longitudinal direction of the rotary block so that the connector and the low pressure inlet communication.

The rotary block is driven by a hydraulic motor, the hydraulic pressure for driving the hydraulic motor is supplied by a hydraulic pressure supply pipe connected to the membrane.

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 an assembly view showing a valve means of the energy recovery device of FIG.

4 is an exploded view of the valve means of the energy recovery device of FIG.

5 is a perspective view of the rotating block of FIG.

Figure 6 is a perspective view of the housing of Figure 3;

7 and 8 is an operational state diagram of the energy recovery device of the seawater desalination system according to a first embodiment of the present invention,

9 is a block diagram showing an energy recovery apparatus of the seawater desalination system according to a second embodiment of the present invention;

10 is an assembly view showing the valve means of the energy recovery device of FIG.

11 is an exploded view of the valve means of the energy recovery device of FIG. 9;

12 is a perspective view showing a rotating block of FIG.

13 is a perspective view showing the housing of FIG. 10;

14 and 15 are operational state diagrams of the energy recovery device of the seawater desalination system according to a second embodiment of the present invention.

* Explanation of Codes *

130, 230: energy recovery device 131, 132: first, second power recovery chamber

133: sea water supply pipe 134: drive motor

137: concentrated water supply pipe 138, 238: concentrated water discharge pipe

140, 240: valve means 150, 250: rotary block

160, 260: housing

Hereinafter, exemplary 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 seawater desalination system to which the present invention is applied, after the seawater drawn in from the sea is stored in the raw water storage tank 112, 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 means 133, the valve means 140 for converting the flow path so that the piston (131a, 132a) in the power recovery chamber (131, 132) alternately reciprocating, and the drive for operating the valve means 140 A motor 134 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. The first check valve 133a and the second check valve 133b are 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 valve means 140 is connected to a concentrated water supply pipe 137 through which the high pressure concentrated water is supplied through the membrane 124, while the low pressure concentrated water is discharged from the valve means 140 through an external flow path (not shown). The brine discharge pipe 138 is connected.

The drive motor 134 is a hydraulic motor and may be an actuator of various types. The hydraulic pressure for driving the driving motor 134 is supplied by the hydraulic pressure supply pipe 139 branched from the concentrated water supply pipe 137. The drive motor 134 is controlled by a pressure sensor and a control means not shown.

3 and 4, the valve means 140 is a rotary block 150 having an internal flow path for selectively controlling the concentrated water entering and exiting the first and second power recovery chambers (131, 132) And a housing 160 provided outside the rotary block 150 to be intermittently connected to an external flow passage (not shown) through the concentrated water discharge pipe 138, and the rotary block 150 and the housing 160. ) Is provided with first and second fixing blocks 141 and 142.

Packings

143 and 144 are in close contact with both sides of the rotary block 150, and the first fixing block 141 and the second fixing block 142 are formed at both sides of the housing 160 and the packings 143 and 144. ) And the valve means 140 is assembled by bolt / nut fastening by the fixing rod 145.

The drive shaft 146 passing through the second fixed block 142 is fitted into the center of the rotary block 150, the drive shaft 146 is supported by a bearing block 147, the bearing (R) is fitted. . And, the high pressure inlet described later of the rotary block 150 is provided with a connector 148 is connected to the concentrated water supply pipe 137, the bearing block 147 is closed by a closing plate 149.

As shown in Figure 5, the rotary block 150 is a solid (solid) cylindrical block, a high pressure inlet 151 is formed in the center of one side so that the high pressure concentrated water flows in, the high pressure inlet 151 The first and second

high pressure outlets

152 and 153 connected to the high pressure inlet 151 through the high pressure internal passage H1 are formed to face the outer circumferential surface so that the concentrated water of the high pressure introduced through the high pressure inlet 151 is discharged. The first and second

low pressure inlets

154 and 155 are formed to face the outer circumferential surface to be introduced therein, and the respective low pressure internal flow paths allow the low pressure concentrated water introduced through the first and second

low pressure inlets

154 and 155 to flow out. First and second

low pressure outlets

156 and 157 connected to the first and second

low pressure inlets

154 and 155 through H2 and H3 are formed at edges of the side surfaces and the other side of the rotary block 150. In the center of the drive shaft 148 is inserted structure 158 is formed to be fixed.

As shown in FIG. 6, the housing 160 is a hollow (hollow) cylindrical housing, and the first and second

high pressure outlets

152 and 153 and the first and second outlets are formed according to the rotation angle of the rotary block 150. The first and

second connectors

161 and 162 communicating with the first and second

low pressure inlets

154 and 155 to selectively connect the inner passage and the outer passage are formed at predetermined angles (90 °) on the outer circumferential surface thereof. to be. The first and second

high pressure outlets

152 and 153 and the first and second low

pressure inlet ports

154 and 155 are first and second connectors 161 of the housing 160 as the rotary block 150 rotates. 162 is selectively communicated with the

brine pots

131c and 132c via a connecting tube.

A concentrated water supply port 141a is formed at the center of the first fixing block 141 to communicate with the high pressure inlet 151, and the rotation of the rotary block 150 is formed at the edge of the first fixing block 141. As a result, the concentrated water outlet 141b communicating with the first and second

low pressure outlets

156 and 157 is formed.

In the energy recovery apparatus of the seawater desalination system according to the first embodiment of the present invention configured as described above, the rotary block 150 is driven by the driving motor 134 driven by the hydraulic pressure supplied through the hydraulic pressure supply pipe 139. When the first high pressure outlet 152 is rotated to communicate with the first connector 161 of the housing 160, the high pressure inlet 151 of the rotary block 150 along the concentrated water supply pipe 137 via the membrane 124. The concentrated water of the high pressure introduced into the internal flow path H1 through the first high pressure outlet 152 and the first connector 161 is discharged through the concentrated water port of the first power recovery chamber 131 along the connection pipe ( It flows into the right space of the piston 131a through 131c, and the piston 131a moves to the left side (A direction) (refer FIG. 7).

Accordingly, the low pressure seawater in the left space of the piston 131a of the first power recovery chamber 131 is compressed to sequentially open the seawater discharge pipe 135 through the seawater port 131b and the second check valve 133b. Via the booster pump 128 to the membrane 124.

Meanwhile, the first low pressure inlet 154 of the rotary block 150 communicates with the second connector 162 of the housing 160 and the first low pressure outlet 156 of the rotary block 150 is the first fixed block 141. Since it is in communication with the concentrated water outlet 141b of (), 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 installed in the seawater supply pipe 133. Piston 132a moves to the right side (B direction) by the low pressure seawater which flowed in (refer FIG. 7).

Therefore, 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 to open the second connector 162 and the first low pressure inlet 154. After entering the inner flow path (H2) through the discharge through the first low pressure outlet 156 and the concentrated water outlet 141b to the external flow path (not shown) along the concentrated water discharge pipe 138.

In this case, the second high pressure outlet 153 and the second low pressure inlet 155 of the rotary block 150 are blocked by the housing 160.

Continuously, the rotary block 150 is further rotated so that the first low pressure inlet 154 of the rotary block 150 communicates with the first connector 161 of the housing 160 and the second high pressure of the rotary block 150. When the outlet 153 communicates with the second connector 162 of the housing 160, the first power recovery chamber 131 through the first check valve 133a and the seawater port 131b installed in the seawater supply pipe 133. The piston 132a is moved to the right side (C direction) by the low pressure seawater flowing into the left space of the piston 131a (see Fig. 8).

Accordingly, 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 to open the first connector 161 and the first low pressure inlet 154. After entering the inner flow path (H2) through the discharge through the first low pressure outlet 156 and the concentrated water outlet 141b to the external flow path (not shown) along the concentrated water discharge pipe 138.

Then, the high pressure concentrated water introduced into the internal flow path H1 through the high pressure inlet 151 of the rotary block 150 along the concentrated water supply pipe 137 via the membrane 124 is the second high pressure outlet 153 and It flows out through the second connector 162 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 connecting pipe, so that the piston 132a is left (D direction). (See Fig. 8).

Accordingly, the low pressure seawater in the left space of the piston 132a of the second power recovery chamber 132 is compressed to sequentially open the seawater discharge pipe 135 through the seawater port 132b and the third check valve 133c. Via the booster pump 128 to the membrane 124.

At this time, the first high pressure outlet 152 and the second low pressure inlet 155 of the rotary block 150 is blocked by the housing 160.

After the rotation block 150 continues to rotate so that the second high pressure outlet 153 communicates with the first connector 161 of the housing 160, the rotation block along the concentrated water supply pipe 137 via the membrane 124. The concentrated water of high pressure introduced into the internal flow path H1 through the high pressure inlet 151 of 150 is discharged through the second high pressure outlet 153 and the first connector 161 to recover the first power along the connection pipe. It flows into the space to the right of the piston 131a through the concentrated water port 131c of the chamber 131, and the piston 131a moves to the left side (A direction) (refer FIG. 7).

Meanwhile, the second low pressure inlet 155 of the rotary block 150 communicates with the second connector 162 of the housing 160 and the second low pressure outlet 157 of the rotary block 150 is the first fixed block 141. Since it is in communication with the concentrated water outlet 141b of (), 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 installed in the seawater supply pipe 133. Piston 132a moves to the right side (B direction) by the low pressure seawater which flowed in (refer FIG. 7).

Therefore, 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 to open the second connector 162 and the second low pressure inlet 155. After entering the inner passage H3 through the second low pressure outlet 157 and the concentrated water outlet 141b is discharged to the external passage (not shown) along the concentrated water discharge pipe 138.

In this case, the first high pressure outlet 152 and the first low pressure inlet 154 of the rotary block 150 are blocked by the housing 160.

Continuously, the rotary block 150 is further rotated so that the first high pressure outlet 152 of the rotary block 150 communicates with the second connector 162 of the housing 160 and the second low pressure of the rotary block 150. When the inlet 155 communicates with the first connector 161 of the housing 160, the first power recovery chamber 131 through the first check valve 133a and the seawater port 131b installed in the seawater supply pipe 133. The piston 132a is moved to the right side (C direction) by the low pressure seawater flowing into the left space of the piston 131a (see Fig. 8).

Accordingly, 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 to open the first connector 161 and the second low pressure inlet 155. After entering the inner passage H3 through the second low pressure outlet 157 and the concentrated water outlet 141b is discharged to the external passage (not shown) along the concentrated water discharge pipe 138.

Then, the high pressure concentrated water introduced into the internal flow path H1 through the high pressure inlet 151 of the rotary block 150 along the concentrated water supply pipe 137 via the membrane 124 is the first high pressure outlet 152 and It flows out through the second connector 162 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 connecting pipe so that the piston 132a is left (D direction). (See Fig. 8).

In this case, the second high pressure outlet 153 and the first low pressure inlet 154 of the rotary block 150 are blocked by the housing 160.

As described above, the valve means 140 takes a flow path formed in four steps sequentially and repeatedly according to one rotation of the rotation block 150 by the drive motor 134, and accordingly, the first power recovery chamber ( 131 and the second power recovery chamber 132 is repeatedly made of high pressure concentrated water and low pressure concentrated water discharge.

Figure 9 is a block diagram showing a seawater desalination system using a reverse osmosis to which the second embodiment of the present invention is applied. As shown, the energy recovery device 230 of the second embodiment of the present invention, the rotary block 250 of the valve means 240 and the housing 260 of the rotary block 150 of the valve means 140 of the first embodiment ) And the housing 160, the position of the brine discharge pipe 238 connected to the valve means 240 is a different structure from the connection position of the brine discharge pipe 138 of the first embodiment. Since the rest of the configuration of the second embodiment is the same as that of the first embodiment, the same reference numerals are used, and detailed description thereof will be omitted.

10 and 11, the valve means 240 is a rotary block 250 having an internal flow path for selectively controlling the concentrated water entering and exiting the first and second power recovery chambers (131, 132) And a housing 260 provided outside the rotary block 250 to be intermittently connected to an external flow passage (not shown) through the concentrated water discharge pipe 238, and the rotary block 250 and the housing 260. ) Is provided with first and second fixing blocks 241 and 242.

Packings

243 and 244 are in close contact with both sides of the rotary block 250, and the first fixing block 241 and the second fixing block 242 are attached to both sides of the housing 260 and the

packings

243 and 244. The valve means 240 is assembled by bolt / nut coupling by the fixing rod 245 in contact with each other.

The drive shaft 246 passing through the second fixing block 242 is fitted into the center of the rotary block 250, the drive shaft 246 is supported by a bearing block 247 is fitted with a bearing (R) . In addition, a high pressure inlet of the rotary block 250 to be described later is provided with a connector 248 is connected to the concentrated water supply pipe 137 (shown in Figure 9), the bearing block 247 by the closing plate 249 Is closed.

As shown in Figure 12, the rotary block 250 is a solid (solid) cylindrical block, a high pressure inlet 251 is formed in the center of one side so that the high pressure concentrated water flows, the high pressure inlet 251 The first and second

high pressure outlets

252 and 253 connected to the high pressure inlet 251 through the high pressure inlet 251 are formed to face the outer circumferential surface of the high pressure inlet 251 so that the concentrated water introduced through the high pressure inlet flows out. The first and second

low pressure inlets

254 and 255 are formed to face the outer circumferential surface, and the first and second

low pressure inlets

254 and 255 are provided so that the low pressure concentrated water introduced through the first and second

low pressure inlets

254 and 255 flows out through the low pressure internal flow path. The first and second

low pressure outlets

256 and 257 connected to the second

low pressure inlets

254 and 255 are formed to face the outer circumferential surface, and the driving shaft 246 is fitted to the center of the other side of the rotary block 250. It is a structure in which the insertion hole (M) is fixed.

As shown in Figure 13, the housing 260 is a hollow (hollow) cylindrical housing, the first, second

high pressure outlets

252, 253 and the First, second, and

third connectors

261, 262, and 263 communicating with the first and second

low pressure inlets

254 and 255 to selectively connect the internal passage and the external passage have a predetermined angle (90 °). ) It is a structure formed in interval and length direction. The first connector 261 and the second connector 262 are formed at 90 ° intervals in the circumferential direction, and the third connector 263 is formed on the same line as the first connector 261 in the longitudinal direction of the housing. do. The concentrated water discharge pipe 238 is connected to the third connector 263.

The outer surface of the rotary block 250 has a first for forming a flow path between the second connector 262 and the first and second

low pressure inlets

254 and 255 and the first and second

low pressure outlets

256 and 257. The

second channel grooves

258 and 259 are formed along the longitudinal direction of the rotary block 250.

A concentrated water supply port 241a communicating with the high pressure inlet 251 is formed at the center of the first fixing block 241.

In the energy recovery apparatus of the seawater desalination system according to the second embodiment of the present invention configured as described above, the rotary block 250 rotates so that the first high pressure outlet 252 communicates with the first connector 261 of the housing 260. Then, the high pressure concentrated water introduced into the inner flow passage through the high pressure inlet 251 of the rotary block 250 along the concentrated water supply pipe 137 via the membrane 124 is the first high pressure outlet 252 and the first connector Outflow through the 261 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 connecting pipe to move the piston 131a to the left (A direction) (See FIG. 14).

Meanwhile, the first low pressure inlet 254 of the rotary block 250 communicates with the second connector 262 of the housing 260 through the first channel groove 258 and the first low pressure outlet of the rotary block 250 ( Since the 256 communicates with the third connector 263 of the housing 260, the piston of the second power recovery chamber 132 is provided through the fourth check valve 133d and the seawater port 132b installed in the seawater supply pipe 133. Piston 132a moves to the right side (B direction) by the low pressure seawater which flowed into the left space of 132a (refer FIG. 14).

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 the second connector 262 and the first flow path groove 258 and After entering the internal flow path through the first low pressure inlet 254, it is discharged through the first low pressure outlet 256 and the third connector 263 to the external flow path (not shown) along the brine discharge pipe 238.

At this time, the second high pressure outlet 253, the second low pressure inlet 255, the second low pressure outlet 257 and the second flow path 259 of the rotary block 250 are blocked by the housing 260. .

Continuously, the rotary block 250 is further rotated so that the first high pressure outlet 252 of the rotary block 250 communicates with the second connector 262 of the housing 260 and the second low pressure of the rotary block 250. When the inlet 255 communicates with the third connector 263 of the housing 260 and communicates with the first connector 261 of the housing 260 through the second channel groove 259, the inlet 255 is connected to the seawater supply pipe 133. The piston 131a is turned to the right (C direction) by the low pressure seawater flowing into the left space of the piston 131a of the first power recovery chamber 131 through the installed first check valve 133a and the seawater port 131b. (See Fig. 15).

Accordingly, 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 to allow the first connector 261 and the second flow path groove 259 and The third connector 263 is discharged to an external flow path (not shown) along the brine discharge pipe 238.

Then, the high pressure concentrated water introduced into the internal flow passage through the high pressure inlet 251 of the rotary block 250 along the concentrated water supply pipe 137 via the membrane 124 is the first high pressure outlet 252 and the second connector. 262 flows out through the condensed water port 132c of the second power recovery chamber 132 along the connecting pipe into the right space of the piston 132a, and the piston 132a moves to the left side (D direction). (See FIG. 15).

In this case, the second high pressure outlet 253, the first low pressure inlet 254, the first low pressure outlet 256, the second low pressure outlet 257, and the first flow path 258 of the rotary block 250 may include a housing ( The flow path is blocked by 260.

Continuously, the rotary block 250 is further rotated so that the second high pressure outlet 253 of the rotary block 250 communicates with the first connector 261 of the housing 260 and the second low pressure of the rotary block 250. When the inlet 255 communicates with the second connector 262 of the housing 260 through the second channel groove 259, the high pressure of the rotary block 250 along the brine supply pipe 137 via the membrane 124 The concentrated water of the high pressure introduced into the internal flow path through the inlet 251 flows out through the second high pressure outlet 253 and the first connector 261, and the concentrated water port of the first power recovery chamber 131 along the connection pipe. It flows into the space to the right of the piston 131a through 131c, and the piston 131a moves to the left side (A direction) (refer FIG. 14).

On the other hand, the second low pressure inlet 255 of the rotary block 250 communicates with the second connector 262 of the housing 260 through the second flow path groove 259 and the second low pressure outlet of the rotary block 250 ( Since the 257 communicates with the third connector 263 of the housing 260, the piston of the second power recovery chamber 132 is provided through the fourth check valve 133d and the seawater port 132b installed in the seawater supply pipe 133. Piston 132a moves to the right side (B direction) by the low pressure seawater which flowed into the left space of 132a (refer FIG. 14).

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 to allow the second connector 262 and the second flow path groove 259 and After entering the internal flow path through the second low pressure inlet 255, the second low pressure outlet 257 and the third connector 263 are discharged to the external flow path (not shown) along the brine discharge pipe 238.

At this time, the first high pressure outlet 252, the first low pressure inlet 254, the first low pressure outlet 256, and the first flow path 258 of the rotary block 250 are blocked by the housing 260. .

Continuously, the rotary block 250 is further rotated so that the second high pressure outlet 253 of the rotary block 250 communicates with the second connector 262 of the housing 260 and the first low pressure of the rotary block 250. When the inlet 254 communicates with the third connector 263 of the housing 260 and communicates with the first connector 261 of the housing 260 through the first channel groove 258, the inlet 254 is connected to the seawater supply pipe 133. The piston 131a is turned to the right (C direction) by the low pressure seawater flowing into the left space of the piston 131a of the first power recovery chamber 131 through the installed first check valve 133a and the seawater port 131b. (See Fig. 15).

Accordingly, 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 to allow the first connector 261 and the first flow path groove 258 and The third connector 263 is discharged to an external flow path (not shown) along the brine discharge pipe 238.

Then, the high pressure concentrated water introduced into the inner flow passage through the high pressure inlet 251 of the rotary block 250 along the concentrated water supply pipe 137 via the membrane 124 is the second high pressure outlet 253 and the second connector. 262 flows out through the condensed water port 132c of the second power recovery chamber 132 along the connecting pipe to the right space of the piston 132a, and the piston 132a moves to the left side (D direction). (See FIG. 15).

In this case, the first high pressure outlet 252, the first low pressure inlet 255, the first low pressure outlet 256, the second low pressure outlet 257 and the second flow path 259 of the rotary block 250 may include a housing ( The flow path is blocked by 260.

As described above, the valve unit 240 sequentially and repeatedly takes the form of a flow path consisting of four steps according to one rotation of the rotation block 250 by the driving motor 134, and accordingly the first power recovery chamber ( 131 and the second power recovery chamber 132 is repeatedly made of high pressure concentrated water and low pressure concentrated water discharge.

According to the energy recovery apparatus of the seawater desalination system according to the present invention, the eccentric force of the block by the high pressure by supplying the concentrated water through the center of the rotary block with a valve for supplying the concentrated water to the power recovery chamber as a cylindrical rotary valve structure In order to suppress the leakage and minimize leakage, improve the energy recovery efficiency and improve the durability, and by driving the valve using a part of the high pressure concentrated water, there is no need for a separate actuator driving power.

Claims

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,

Energy of the seawater desalination system comprising a rotary block having an internal flow path for selectively intermitting the concentrated water entering and exiting the power recovery chamber, and a housing provided on the outside of the rotary block to be intermittently connected to the external flow path. Recovery device.
The method according to claim 1,

The rotary block has a high pressure inlet formed on the side (rotational axis direction surface) and a high pressure outlet formed on the outer circumferential surface to allow the high pressure concentrated water to come in and out, and a low pressure inlet and the side (rotational center axis direction surface) on the outer circumferential surface so that the low pressure concentrated water enters the Has a low pressure outlet formed in

The housing is the energy recovery device of the desalination system of the seawater desalination system characterized in that it comprises a plurality of connections in communication with the high pressure outlet and the low pressure inlet in accordance with the rotation angle of the rotary block to selectively connect the internal passage and the external passage.
The method according to claim 1,

The rotary block has a high pressure inlet formed on the side (rotational axis direction surface) and a high pressure outlet formed on the outer circumferential surface to allow the high pressure concentrated water to come in and out, and a low pressure inlet and a low pressure outlet formed on the outer circumferential surface of the low pressure concentrated water.

The housing is connected to the high pressure outlet, the low pressure inlet and the low pressure outlet according to the rotation angle of the rotary block has a plurality of connections for selectively connecting the internal flow path and the external flow path energy recovery apparatus of the seawater desalination system .
The method according to claim 3,

The outer surface of the rotary block is an energy recovery device of the seawater desalination system, characterized in that the flow path groove is formed along the longitudinal direction of the rotary block so that the connector and the low pressure inlet communication.
The method according to claim 2 or 3,

The rotary block is an energy recovery device of the seawater desalination system, characterized in that driven by a hydraulic motor.
The method according to claim 5,

The hydraulic pressure driving the hydraulic motor is supplied by a hydraulic pressure supply pipe connected to the membrane energy recovery device of the seawater desalination system.