WO2011151883A1

WO2011151883A1 - Power recovery device of liquid treatment apparatus

Info

Publication number: WO2011151883A1
Application number: PCT/JP2010/059220
Authority: WO
Inventors: 高橋　良一; 公一松井
Original assignee: 株式会社東芝
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2011-12-08
Also published as: JP5337301B2; AU2010354672A1; AU2010354672B2; JPWO2011151883A1; US20130094949A1; CN102822449A

Abstract

Disclosed is a power recovery device (24) used for a liquid treatment apparatus which feeds raw water composed of a plurality of components to a reverse osmosis membrane via a pressure increase unit, to extract water by the reverse osmosis membrane. The power recovery device (24) adds the high-density raw water from which water has been extracted, to another raw water supplied from the pressure increase unit using the pressure of the high-density raw water, and feeds the mixed raw water to the reverse osmosis membrane. A fixed center shaft (34) and a rotation member (36) which can rotate about the center shaft are contained in an inner space (30) of a housing (32). The rotation member is comprised of a plurality of passages (36c) which are arranged at regular intervals in the circumferential direction and which extend from the inner peripheral surface to the outer peripheral surface of the rotation member. Raw water (LPF) introduced to a section (38a) of the inner space impinges on the outer peripheral surface of the rotation member, to rotate the rotation member. After that, the raw water is discharged to the outside via the inner ends of the passages and a raw water discharge passage (42a) of the center shaft. A centrifugal force generated by the rotation of the rotation member is applied to high-density raw water (HPB) introduced to the inner ends of the passages via a high-density raw water passage of the center shaft, and the high-density raw water is added via the outer ends of the passages and another section (38b) of the inner space, as described above.

Description

Power recovery device for liquid processing equipment

Embodiments of the present invention relate to a power recovery apparatus for a liquid processing apparatus.

For example, a liquid processing apparatus that processes water containing a plurality of components (hereinafter referred to as raw water) using a reverse osmosis membrane called an RO membrane is known.

Raw water is supplied to the reverse osmosis membrane at high pressure, and water is extracted from the raw water in the reverse osmosis membrane. Meanwhile, the ratio of water extracted by the reverse osmosis membrane tends to increase as the pressure value of the raw water supplied to the reverse osmosis membrane increases. However, in order to increase the pressure value of the raw water, the strength of the raw water pressure raising device necessary to increase the pressure value of the raw water must be increased, and the amount of energy required for improving the pressure of the raw water also increases. Usually, the configuration of the raw water pressure raising device is also complicated.

The raw water after the water is extracted at a certain rate in the reverse osmosis membrane (herein, the high concentration raw water) loses some of its pressure due to the extraction of the water in the reverse osmosis membrane. The raw water maintains most of the high pressure that was loaded on the raw water when it was supplied to the reverse osmosis membrane.

JP 2009-103109 A

[Problems to be solved by the invention]
The high-pressure energy maintained by the high-concentration raw water is recovered with high efficiency and the pressure of new raw water supplied to the reverse osmosis membrane is increased with a simple configuration, and the high-pressure raw water is supplied to the reverse osmosis membrane at high pressure. A power recovery device for a liquid processing apparatus that can reduce the amount of new external energy required for increasing the pressure of new raw water, and thus can reduce the amount of energy required for operation of the liquid processing apparatus, that is, the power. Is to provide.

[Means for solving problems]
According to one embodiment of the present invention, a power recovery device for a liquid processing apparatus sends raw water, which is water supplied from the outside and contains a plurality of components, to a reverse osmosis membrane via a pressure increase unit, and then water from the raw water in the reverse osmosis membrane. Used in a liquid processing apparatus for extracting a part of the raw water, and the raw water whose pressure has been increased by using the pressure of the remaining raw water after the water is partially extracted in the reverse osmosis membrane is added to the raw water from the pressure increasing unit. Power recovery device that feeds the reverse osmosis membrane.

The power recovery apparatus includes: a housing having an internal space; a central shaft having an outer peripheral surface fixed to the internal space of the housing and projecting to the outside of the housing; and a center in the internal space of the housing An inner peripheral surface that is rotatably accommodated around the outer peripheral surface of the shaft and that faces the outer peripheral surface of the central shaft, and an outer peripheral surface that is located radially outward of the central shaft, and so on in the circumferential direction of the central shaft A rotating member including a plurality of passages arranged at intervals and each extending between an inner peripheral surface and an outer peripheral surface.

In the internal space of the housing, at least one set of two-to-one set chambers facing the outer peripheral surface of the rotating member and partitioned from each other is provided.

The central axis is formed on the outer peripheral surface of the central axis and faces at least one pair of chambers in the internal space of the housing via a rotating member, and has at least one pair of two-to-one sets equal to the number of the chambers, and at least one A two-to-one pair of passages extending from the pair of openings in the central axis and opening at the at least one end of the central axis are formed.

One pair of chambers arranged symmetrically with respect to the central axis in the pair of chambers in the internal space of the housing is introduced with the raw water introduced from the outside by introducing the raw water supplied from the outside. The rotating member is configured to rotate by pressing against a plurality of passages on the outer peripheral surface of the rotating member exposed in the pair of chambers in a predetermined circumferential direction of the outer peripheral surface.

The other pair of chambers arranged symmetrically with respect to the central axis in the pair of chambers are connected to the raw water passage between the pressure raising unit and the reverse osmosis membrane.

One pair of openings opposed to the one pair of chambers through the rotating member in the pair of openings on the outer peripheral surface of the central axis is connected to the outside through one pair of passages corresponding to the central axis. It is communicated to.

The other pair of openings facing the other pair of chambers through the rotating member in the pair of openings on the outer peripheral surface of the central axis is connected to the other pair of passages corresponding to the central axis via the other pair of passages. The remaining raw water is introduced.

FIG. 1 is a diagram schematically showing an entire example of a liquid processing apparatus in which a power recovery apparatus according to the first embodiment of the present invention is used. FIG. 2 is a perspective view schematically showing the external appearance of the power recovery apparatus according to the first embodiment of the present invention. FIG. 3 is a schematic exploded perspective view of the power recovery device of FIG. 2. FIG. 4 is a schematic perspective view from below of the case with the central axis of the power recovery device of FIG. FIG. 5 is a perspective view schematically showing a horizontal cross section of the rotating member of the power recovery apparatus of FIG. 3. FIG. 6 is a schematic perspective view of the central axis of the power recovery apparatus of FIG. FIG. 7 is a schematic perspective view of a lower portion after the central axis of FIG. 6 is cut along line IV-IV. 8 is an exploded perspective view similar to FIG. 3 for explaining the operation of the power recovery apparatus of FIG. FIG. 9 is a schematic plan view of a combination of the case of FIG. 8, the central shaft, and the rotating member for explaining the operation of the power recovery apparatus of FIG. FIG. 10 is a schematic exploded perspective view of a power recovery apparatus according to the second embodiment of the present invention. FIG. 11 is a perspective view showing a half of the rotating member of the power recovery device of FIG. 10 in a horizontal section. FIG. 12 is a perspective view of the central axis of FIG. FIG. 13 is a schematic perspective view of the lower part after the central axis of FIG. 12 is cut along the line XIII-XIII. FIG. 14 is a schematic perspective view of the lower end portion after further cutting the lower portion of the central axis in FIG. 13 along the line XIV-XIV.

First, an overall schematic configuration of an example of a liquid processing apparatus in which the power recovery apparatus according to the first embodiment of the present invention is used will be described with reference to FIG.

An example of a liquid processing apparatus is a seawater desalination apparatus. In this seawater desalination apparatus, the raw water that is supplied from the outside and contains a plurality of components is seawater. Seawater SW pumped up from the sea is supplied to the pretreatment unit 10. The pretreatment unit 10 performs pretreatment by adding, for example, a bactericide 10a, a flocculant 10b, a scale inhibitor 10c, a dechlorinating agent 10d, and the like to the seawater SW supplied thereto. The pretreated seawater (pretreated seawater) PSW is guided by a pipe so as to pass through the water pump 12 and the security filter 14. The pretreated seawater PSW after passing through the security filter 14 is branched into two by a branch pipe.

One branch pipe is connected to the reverse osmosis membrane unit 18 storing the reverse osmosis membrane 18a through the pressure raising unit 16. In this embodiment, the pressure raising unit 16 is provided by a high pressure pump. The pretreated seawater PSW loaded with a predetermined high pressure by the pressure raising unit 16 is sent to the reverse osmosis membrane unit 18 through one branch pipe. A part of the water (fresh water) FW is extracted from the high-pressure pretreated seawater HPSW by the reverse osmosis membrane unit 18 in the reverse osmosis membrane unit 18.

Extracted water FW is guided to the water purification tank 20 by piping. In the water purification tank 20, for example, a hardness adjusting agent 20 a, a ph adjusting agent 20 b, a disinfecting agent 20 c, and the like are added to the water FW to create the purified water CW. The purified water CW created in the purified water tank 20 is supplied to the water pipe 23 via the purified water supply pump 22.

The other branch pipe is connected to the power recovery device 24 according to the first embodiment. The low-pressure pretreatment seawater PSW sent to the power recovery device 24 via the other branch pipe is called a low-pressure feed LPF. Seawater (high-concentration seawater) in which a part of the water FW is extracted in the reverse osmosis membrane unit 18 and the concentration of various components including salt is increased and the pressure is somewhat reduced is led to the power recovery device 24 by piping. ing. High-concentration seawater sent from the reverse osmosis membrane unit 18 to the power recovery device 24 is called high-pressure brine HPB.

The power recovery device 24 increases the pressure of the low-pressure feed LPF by increasing the pressure of the high-pressure brine HPB with the energy of the low-pressure feed LPF and then the high-pressure brine HPB having the increased pressure pushes out the low-pressure feed LPF. And discharged as a high-pressure feed HPF. That is, the energy of the high pressure feed HPF is generated by using a part of the energy of the low pressure feed LPF in addition to using most of the energy of the high pressure brine HPB. ing.

The high-pressure feed HPF is led from the power recovery device 24 to a pipe between the pressure raising unit 16 and the reverse osmosis membrane unit 18 by a pipe. The high-pressure feed HPF is added to the high-pressure pretreated seawater HPSW from the pressure increasing unit 16 toward the reverse osmosis membrane unit 18 in this pipe, and goes to the reverse osmosis membrane unit 18 together with the high-pressure pretreated seawater HPSW.

The low-pressure feed LPF after being used to increase the pressure of the high-pressure brine HPB in the power recovery device 24 further increased the pressure using a part of the energy of the low-pressure feed LPF in the next cycle. The pressure is increased by the high-pressure brine HPB to become a high-pressure feed HPF. At this time, the high-pressure brine HPB increases the pressure of the low-pressure feed LPF, then loses the pressure, and is discharged from the power recovery device 24 to the outside as the low-pressure brine LPB.

[First Embodiment]
Next, the configuration of the power recovery device 24 of the first embodiment will be described with reference to FIGS. 2 to 7.

The power recovery device 24 includes a housing 32 having an internal space 30 as shown in FIGS. In this embodiment, the housing 32 includes a case 32a having a substantially circular recess that provides the internal space 30, and a lid 32b that liquid-tightly covers an opening on one side of the recess of the case 32a. . The lid 32b is detachably fixed to the case 32a by known fixing means (not shown).

The power recovery device 24 further includes a central shaft 34 that is fixed to the internal space 30 of the housing 32 and has an outer peripheral surface and at least one end protruding outside the housing 32. Specifically, the central shaft 34 is elongated, and a part of the outer peripheral surface thereof is liquid-tightly fixed to a through hole 32c formed at the center of the bottom surface of the recess of the case 32a. One end portion of the central shaft 34 located on one side along the longitudinal center line of the central shaft 34 projects from the through hole 32c into the external space below the case 32a. The other end portion of the central axis 34 located on the other side along the longitudinal center line projects from the through hole 32d at the center of the lid 32b into the external space above the lid 32b.

The power recovery device 24 also includes a rotating member 36 that is housed in the inner space 30 of the housing 32 so as to be rotatable around the outer peripheral surface of the central shaft 34. The rotating member 36 has an inner peripheral surface 36a facing the outer peripheral surface of the central shaft 34 and an outer peripheral surface 36b positioned radially outward of the central shaft 34, as shown in FIG. It includes a plurality of passages 36c that are arranged at equal intervals in the circumferential direction of the shaft 34 and each extend between the inner peripheral surface 36a and the outer peripheral surface 36b.

As shown well in FIG. 3, the internal space 30 of the housing 32 is provided with at least one pair of

chambers

38 a and 38 b that are two-to-one and face each other and face the outer peripheral surface 36 b of the rotating member 36. It has been. In this embodiment, a pair of

chambers

38a and 38b are provided.

In the pair of

chambers

38a and 38b of the internal space 30 of the housing 32, a pair of chambers 38a disposed symmetrically with respect to the central axis 34 are provided with power as shown in FIG. The low pressure feed LPF supplied to the recovery device 24 is introduced as shown in FIG. One pair of chambers 38a has a predetermined circumferential direction of the outer peripheral surface 36b with respect to the outer peripheral surface 36b of the rotating member 36 exposing the introduced low-pressure feed LPF in the one pair of chambers 38a (in FIG. 3). It is shaped to follow (counterclockwise direction).

In the pair of

chambers

38a and 38b, the other pair of chambers 38b arranged symmetrically with respect to the central axis 34 is supplied with pressure from the power recovery device 24 as shown in FIGS. It is connected to a pipe for high pressure feed HPF that goes to the pipe between the ascending unit 16 and the reverse osmosis membrane unit 18.

6 and 7, the central shaft 34 is formed on the outer peripheral surface of the central shaft 34, and at least one pair of

chambers

38 a and 38 b in the inner space 30 of the housing 32 is interposed via a rotating member 36. At least one pair of

openings

40a and 40b, which are the same number as the

chambers

38a and 38b. In this embodiment, two-to-one sets of

openings

40 a and 40 b are formed on the outer peripheral surface of the central shaft 34 at equal intervals in the circumferential direction of the outer peripheral surface.

From one pair of openings 40a corresponding to one pair of chambers 38a of the internal space 30 of the housing 32, the other end located above the center axis 34 in FIG. A pair of passages 42a (see FIG. 7) extend to the portion, and the pair of passages 42a open to the end face of the other end. The pair of passages 42a can be integrated into the central shaft 34 before reaching the other end as shown in FIGS. The opening of the integrated passage 42a at the end face of the other end of the central shaft 34 is connected to a conduit for the low pressure brine LPB extending from the power recovery device 24 as shown in FIGS. Has been.

From the other pair of openings 40b corresponding to the other pair of chambers 38b of the internal space 30 of the housing 32, one end portion of the center shaft 34 located below the center shaft 34 in FIG. A pair of passages 42b (see FIG. 7) extends to the end, and the pair of passages 42b opens at the end face of the one end. The pair of passages 42b can be integrated into the central shaft 34 before reaching the one end as shown in FIG. The opening of the integrated passage 42b at the end face of one end of the central shaft 34 is made of high-pressure brine HPB extending from the reverse osmosis membrane unit 18 toward the power recovery device 24 as shown in FIGS. Is connected to the pipeline.

Next, the operation of the power recovery device 24 described above with reference to FIGS. 2 to 7 will be described with reference to FIGS.

The high-pressure brine HPB fed from the reverse osmosis membrane unit 18 shown in FIG. 1 toward the power recovery device 24 is connected to the central shaft 34 of the power recovery device 24 as shown in FIGS. The other pair of openings 40b on the outer peripheral surface of the central shaft 34 is reached via a passage 42b (see FIG. 4) that opens to the end face of the lower end portion, and the other one of the plurality of passages 36c of the rotating member 36 It flows into some of the passages 36c with the inner ends exposed at the pair of openings 40b. During this time, the low pressure feed LPF sent from the pretreatment unit 10 shown in FIG. 1 to the power recovery device 24 via the water pump 12 and the safety filter 14 is shown in FIGS. As shown in the figure, the air flows into the pair of chambers 38 a of the case 32 a of the housing 32 of the power recovery device 24. The low-pressure feed LPF that has flowed into the pair of chambers 38a has a predetermined circumference on the outer circumferential surface of the rotating member 36 with respect to the portion of the outer circumferential surface of the rotating member 36 exposed in the pair of chambers 38a. Pressed along the direction. As a result, the low-pressure feed LPF in one pair of chambers 38a has the side surfaces of several passages 36c that expose the outer ends in one pair of chambers 38a in the plurality of passages 36c of the rotating member 36. It flows into these several passages 36c while pushing. A part of the energy of the low-pressure feed LPF is consumed to rotate the rotating member 36 in the predetermined direction R.

As the rotary member 36 rotates, the low pressure feed LPF in the passage 36c is located between one pair of chambers 38a and the other pair of chambers 38b, and one pair of openings 40a and the other opening 40b of the central shaft 34. Between the passage 36c and the other pair of chambers 38b and the other opening 40b of the central shaft 34 by the high-pressure brine HPB flowing into the passage 36c from the other opening 40b. Are pushed into a pair of chambers 38b. During this time, the pressure energy of the high-pressure brine HPB that has flowed into the passage 36c from the opening 40b is applied to the low-pressure feed LPF in the passage 36c, and the low-pressure feed LPF in the passage 36c becomes the high-pressure feed HPF. Extruded.

The high-pressure brine HPB that has flowed into the passage 36c from the other opening 40b gives pressure energy to the low-pressure feed LPF in the passage 36c, and the pressure energy is greatly reduced or eliminated to become the low-pressure brine LPB. Further rotation of 36 in the passage 36c between the other pair of chambers 38b and one pair of chambers 38a and between the other pair of openings 40b and one pair of openings 40a of the central shaft 34. The central shaft is driven by the low-pressure feed LPF that is confined to the pair of chambers 38a and the pair of openings 40a of the central shaft 34 and then flows into the passage 36c from the pair of chambers 38a. 34 is discharged to the outside of the power recovery device 24 through one pair of passages 42a corresponding to one pair of openings 40a.

The high-pressure feed HPF in the other pair of chambers 38b is led from the power recovery device 24 to the piping between the pressure increasing unit 16 and the reverse osmosis membrane unit 18 by piping as shown in FIG. The high-pressure feed HPF is added to the high-pressure pretreated seawater HPSW from the pressure increasing unit 16 toward the reverse osmosis membrane unit 18 in this pipe, and goes to the reverse osmosis membrane unit 18 together with the high-pressure pretreated seawater HPSW.

As a result, if the amount of fresh water FW extracted in the reverse osmosis membrane unit 18 per unit time is constant, the high pressure that must be sent from the pressure increase unit 16 toward the reverse osmosis membrane unit 18 per unit time. The amount of pretreated seawater HPSW can be reduced. This can reduce the amount of energy required for the operation of the seawater desalination apparatus, which is a kind of liquid processing apparatus using the power recovery device 24, that is, the power.

Further, in the power recovery device 24 of this embodiment, the two-to-one set of

chambers

38a and 38b provided in the internal space 30 of the case 32a of the housing 32 are mutually separated with the central shaft 34 interposed therebetween. The same low-pressure feed LPF is introduced into one pair of chambers 38a arranged symmetrically with respect to each other, and at the same time, the same with the other pair of chambers 38b arranged symmetrically with respect to each other across the central axis 34. High pressure brine HPB has been introduced. Accordingly, the low pressure feed LPF in one pair of chambers 38a and the rotating member 36 rotatably accommodated in the case 32a of the housing 32 and the inner space 30 of the case 32a with respect to the outer peripheral surface of the central shaft 34 The force applied by the high pressure brine HPB in the other pair of chambers 38 b is canceled in the radial direction of the central shaft 34.

Further, the mixture of the low-pressure brine LPB and the high-pressure brine HPB that have entered the gap between the outer peripheral surface of the central shaft 34 and the inner peripheral surface 36 a of the rotating member 36 causes the rotation of the rotating member 36 on the outer peripheral surface of the central shaft 34. Accordingly, it functions as a radial dynamic pressure bearing between the outer peripheral surface of the central shaft 34 and the inner peripheral surface 36 a of the rotating member 36. Further, the area excluding the two-to-one pair of

chambers

38a and 38b on the inner peripheral surface facing the outer peripheral surface 36b of the rotating member 36 in the inner space 30 of the case 32a of the housing 32 and the outer peripheral surface 36b of the rotating member 36. The mixture of the low-pressure feed LPF and the high-pressure feed HPF entering the gap between the outer peripheral surface of the central shaft 34 and the inner space of the outer peripheral surface 36b of the rotating member 36 and the case 32a of the housing 32 as the rotating member 36 rotates on the outer peripheral surface of the central shaft 34. It functions as a radial dynamic pressure bearing between the above-described regions on the inner peripheral surface of 30.

Therefore, an independent radial bearing is not required between the outer peripheral surface of the central shaft 34 and the inner peripheral surface 36a of the rotating member 36, and the configuration of the power recovery device 24 of this embodiment can be simplified and the manufacturing cost can be reduced. I can do it.

Furthermore, the low-pressure brine LPB that has entered a gap between the inner surface of the lid 32b of the housing 32 and one side surface of the rotating member 36 in the inner space 30 of the case 32a of the housing 32 that faces the inner surface. The mixture of the high-pressure brine HPB and the mixture of the low-pressure feed LPF and the high-pressure feed HPF is formed between the inner surface of the lid 32b and the one side surface of the rotary member 36 as the rotary member 36 rotates on the outer peripheral surface of the central shaft 34. It functions as a thrust bearing. At the same time, the low pressure brine that has entered the gap between the lower surface of the internal space 30 of the case 32a of the housing 32 and the other side surface of the rotating member 36 in the internal space 30 of the case 32a of the housing 32 facing the bottom surface. A mixture of LPB and high-pressure brine HPB and a mixture of low-pressure feed LPF and high-pressure feed HPF are produced by the rotation of the rotary member 36 on the outer peripheral surface of the central shaft 34 and the other surface of the internal space 30 of the case 32a and the other side of the rotary member 36. Acts as a thrust bearing between the sides.

Therefore, an independent thrust bearing is not required between the inner surface of the lid 32b and the one side surface of the rotating member 36 and between the lower surface of the internal space 30 of the case 32a and the other side surface of the rotating member 36. The configuration of the power recovery device 24 of this embodiment can be simplified and the manufacturing cost can be reduced.

[Second Embodiment]
Next, instead of the power recovery device 24 of the first embodiment described above with reference to FIGS. 2 to 9 with reference to FIGS. 10 to 14, in the liquid processing apparatus of the example described with reference to FIG. A configuration of a power recovery device 24 'according to the second embodiment of the present invention that can be used will be described.

The power recovery device 24 ′ includes a housing 43 having an internal space 41 as shown in FIGS. 10 to 14. In this embodiment, the housing 43 includes a case 43a having a substantially circular recess that provides the internal space 41, and a lid 43b that liquid-tightly covers the opening on one side of the recess of the case 43a. . The lid 43b is detachably fixed to the case 43a by known fixing means (not shown).

The power recovery device 24 ′ includes a central shaft 44 that protrudes from the center of the inner space 41 of the housing 43 to the outer space above the lid 43 b through the central through-hole 43 c of the lid 43 b. Specifically, the central shaft 44 is elongated, and a part of the outer peripheral surface thereof is liquid-tightly fixed to the central through hole 43c of the lid 43b. One end of the central shaft 44 located on one side along the longitudinal center line of the central shaft 44 protrudes from the through hole 43c of the lid 43b to the external space above the lid 32b. The other end of the central shaft 44 located on the other side along the longitudinal center line is located slightly above the center of the bottom surface of the internal space 41 of the housing 43.

The power recovery device 24 ′ also includes a rotating member 46 that is rotatably accommodated in the inner space 41 of the housing 43 around the outer peripheral surface of the other end portion of the central shaft 44. Specifically, a bottomed hole 46 a that receives the other end of the central shaft 44 is formed in the center of the rotating member 46. The inner peripheral surface 46b and the bottom surface of the bottomed hole 46a face the outer peripheral surface and the end surface of the other end of the central shaft 44 received in the bottomed hole 46a so as to be rotatable relative to each other. The rotating members 46 are arranged at equal intervals in the circumferential direction of the bottom hole 46a as shown in FIG. 11 and the outer peripheral surface 46c positioned radially outward of the bottom hole 46a. A plurality of passages 46d extending between the surface 46b and the outer peripheral surface 46c are included.

As is well shown in FIG. 10, the internal space 41 of the housing 43 is provided with at least one pair of

chambers

48a and 48b that are two-to-one and face each other and face the outer peripheral surface 46c of the rotating member 46. It has been. In this embodiment, a two-to-one set of

chambers

48a, 48b is provided.

In the pair of

chambers

48a and 48b of the internal space 41 of the housing 43, one pair of chambers 48a disposed symmetrically with respect to the central axis 44 is connected to the power recovery device 24 'in FIG. The low pressure feed LPF being supplied is introduced as shown in FIG. One pair of chambers 48a has a predetermined circumferential direction of the outer peripheral surface 46c (in FIG. 10) with respect to the outer peripheral surface 46c of the rotating member 46 exposing the introduced low-pressure feed LPF in the one pair of chambers 48a. It is shaped to follow (counterclockwise direction).

In the pair of

chambers

48a and 48b, the other pair of chambers 48b arranged symmetrically with respect to the central axis 44 is connected to the power recovery device 24 'as shown in FIGS. It is connected to a pipe for high pressure feed HPF that goes to the pipe between the pressure raising unit 16 and the reverse osmosis membrane unit 18.

The center shaft 44 has at least one set of chambers in the inner space 41 of the housing 43 formed on the outer peripheral surface of the other end portion of the center shaft 44 as well shown in FIGS. 10 and 12 to 14. 48a and 48b are opposed to each other with the rotation member 46 therebetween, and at least one pair of

openings

50a and 50b of the same number as the

chambers

48a and 48b is formed. In this embodiment, two-to-one sets of

openings

50a and 50b are formed on the outer peripheral surface of the other end portion of the central shaft 44 at equal intervals in the circumferential direction of the outer peripheral surface.

From one pair of openings 50a corresponding to one pair of chambers 48a in the internal space 41 of the housing 43, the center axis 44 is located above the central axis 44 toward the one end. A pair of passages 52a (see FIG. 14) extends, and the pair of passages 52a are open at the end face of the one end. The pair of passages 52a can be integrated into the central shaft 44 until reaching the one end as shown in FIGS. The opening of the integrated passage 52a at the end face of the one end of the central shaft 44 is a low-pressure brine extending from the power recovery device 24 (24 'in this embodiment) as shown in FIGS. It is connected to the pipeline for LPB.

From the other pair of openings 50b corresponding to the other pair of chambers 48b of the internal space 41 of the housing 43, the inside of the central shaft 44 is directed to the one end located above the central shaft 44. A pair of passages 52b (see FIG. 14) extends, and the pair of passages 52b open to the end face of the one end. The pair of passages 52b can be integrated into one in the central shaft 44 before reaching the one end as shown in FIGS. In this embodiment, the pair of passages 52b are concentrically integrated with the integrated passage 52a as described above on the end face of the one end portion of the central shaft 44. The opening of the integrated passage 52b at the end face of the one end portion of the central shaft 44 extends from the reverse osmosis membrane unit 18 to the power recovery device 24 (24 ′ in this embodiment) as shown in FIGS. Is connected to the line for the high-pressure brine HPB extending to

A through hole 43d is formed in the center of the bottom surface of the internal space 41 of the housing 43 of this embodiment (ie, the bottom surface of the case 42a), and the output shaft 54a of the motor 54 is rotatable and liquid-tight in the through hole 43d. Has been inserted. Such a rotatable and liquid-tight insertion of the output shaft 54a of the motor 54 is, for example, an O-ring or an oil seal between the inner peripheral surface of the through hole 43d and the outer peripheral surface of the output shaft 54a of the motor 54. This is possible by interposing a known annular sealing member.

The protruding end of the output shaft 54 a of the motor 54 inserted into the through hole 43 d is concentrically fixed from the outside to the bottom wall of the bottom hole 46 a in the center of the rotating member 46 in the internal space 41 of the housing 43.

Next, the operation of the power recovery device 24 ′ described above with reference to FIGS. 10 to 14 will be described with reference to FIG.

The high pressure brine HPB sent out from the reverse osmosis membrane unit 18 shown in FIG. 1 toward the power recovery device 24 (24 ′ in this embodiment) is a power recovery device 24 as shown in FIG. A plurality of passages of the rotating member 46, reaching the other pair of openings 50 b on the outer peripheral surface of the other end portion of the central shaft 44 via a passage 52 b opened on the end face of one end portion above the central shaft 44 ′. In 46d, the other pair of openings 50b flows into some of the passages 46d in which the inner ends are exposed. During this time, the low-pressure feed LPF sent from the pretreatment unit 10 shown in FIG. 1 to the power recovery device 24 (24 ′ in this embodiment) via the water pump 12 and the security filter 14 is shown in FIG. As shown in the figure, it flows into one pair of chambers 48a of the case 42a of the housing 43 of the power recovery device 24 '. The low-pressure feed LPF that has flowed into the pair of chambers 48a has a predetermined circumference on the outer peripheral surface of the rotating member 46 with respect to the portion of the outer peripheral surface of the rotating member 46 exposed in the pair of chambers 48a. Pressed along the direction. As a result, the low-pressure feed LPF in one pair of chambers 48a has the side surfaces of several passages 46d exposing the outer ends in one pair of chambers 48a in the plurality of passages 46d of the rotating member 46. It flows into these several passages 46d while pushing. A part of the energy of the low pressure feed LPF is consumed to rotate the rotating member 46 in the predetermined direction R.

As the rotary member 46 rotates, the low pressure feed LPF in the passage 46d is between one pair of chambers 48a and the other pair of chambers 48b, and one pair of openings 50a and the other opening 50b of the central shaft 44. Between the passage 46d and the other pair of chambers 48b and the other opening 50b of the central shaft 44 by the high-pressure brine HPB flowing into the passage 46d from the other opening 50b. Into a pair of chambers 48b. During this time, the pressure energy of the high-pressure brine HPB flowing into the passage 46d from the opening 50b is applied to the low-pressure feed LPF in the passage 46d, so that the low-pressure feed LPF in the passage 46d becomes the high-pressure feed HPF in the other pair of chambers 48b. Extruded.

The high-pressure brine HPB that has flowed into the passage 46d from the other opening 50b gives pressure energy to the low-pressure feed LPF in the passage 46d so that the pressure energy is greatly reduced or eliminated to become the low-pressure brine LPB. 36 further rotation in the passage 46d between the other pair of chambers 48b and one pair of chambers 48a and between the other pair of openings 50b and one pair of openings 50a in the central shaft 44. And then the central shaft by the low-pressure feed LPF that flows from one pair of chambers 58a into the passage 56d when corresponding to one pair of chambers 48a and one pair of openings 50a of the central shaft 44. One pair of openings 50a of 44 is discharged to the outside of the power recovery device 24 (24 ′ in this embodiment) through one pair of corresponding passages 52a.

The high pressure feed HPF in the other pair of chambers 48b is connected to the pressure raising unit 16 and the reverse osmosis membrane unit by piping from the power recovery device 24 (24 'in this embodiment) as shown in FIGS. 18 to the pipe between the two. The high-pressure feed HPF is added to the high-pressure pretreated seawater HPSW from the pressure increasing unit 16 toward the reverse osmosis membrane unit 18 in this pipe, and goes to the reverse osmosis membrane unit 18 together with the high-pressure pretreated seawater HPSW.

As a result, if the amount of fresh water FW extracted in the reverse osmosis membrane unit 18 per unit time is constant, the high pressure that must be sent from the pressure increase unit 16 toward the reverse osmosis membrane unit 18 per unit time. The amount of pretreated seawater HPSW can be reduced. This can reduce the amount of energy required for the operation of the seawater desalination apparatus, which is a kind of liquid processing apparatus using the power recovery apparatus 24 (24 ′ in this embodiment), that is, power.

In this embodiment, the rotation of the rotating member 46 in the inner space 41 of the housing 43 can be controlled using the motor 54. In other words, the power recovery device 24 ′ provides the high pressure feed HPF that is led from the power recovery device 24 ′ to the piping between the pressure increasing unit 16 and the reverse osmosis membrane unit 18 by the rotation of the rotating member 46. The amount of energy applied can be controlled independently of the value of the rotational force applied to the rotating member 46 by the low pressure feed LPF supplied to the power recovery device 24 '.

Further, in the power recovery device 24 ′ of this embodiment, the two-to-one set of

chambers

48 a and 48 b provided to be mutually partitioned in the internal space 41 of the case 42 a of the housing 43 sandwich the central shaft 44. The same low-pressure feed LPF is introduced into one pair of chambers 48a arranged symmetrically with respect to each other, and at the same time, the other pair of chambers 48b arranged symmetrically with respect to each other with the central axis 44 interposed therebetween. The same high pressure brine HPB is introduced. Therefore, the low pressure feed LPF in one pair of chambers 48a and the rotating member 46 rotatably accommodated in the case 42a of the housing 43 and the inner space 41 of the case 42a with respect to the outer peripheral surface of the central shaft 44 and The force applied by the high pressure brine HPB in the other pair of chambers 48 b is canceled in the radial direction of the central shaft 44.

Further, the mixture of the low-pressure brine LPB and the high-pressure brine HPB that have entered the gap between the outer peripheral surface of the other end of the central shaft 44 and the inner peripheral surface 46 b of the bottomed hole 46 a of the rotating member 46 is the outer periphery of the central shaft 44. Along with the rotation of the rotating member 46 on the surface, it functions as a radial dynamic pressure bearing between the outer peripheral surface of the other end of the central shaft 44 and the inner peripheral surface 46b of the bottomed hole 46a of the rotating member 46. Further, the area excluding the two-to-one pair of

chambers

48a and 48b on the inner peripheral surface facing the outer peripheral surface 46c of the rotating member 46 in the inner space 41 of the case 42a of the housing 43 and the outer peripheral surface 46c of the rotating member 46. The mixture of the low pressure feed LPF and the high pressure feed HPF that has entered the gap between the outer peripheral surface of the central shaft 44 and the outer peripheral surface 46c of the rotating member 46 and the case of the housing 43 along with the rotation of the rotating member 46 on the outer peripheral surface of the other end portion of the central shaft 44. It functions as a radial dynamic pressure bearing between the above-mentioned area | region of the internal peripheral surface of the internal space 41 of 42a.

Therefore, an independent radial bearing is not required between the outer peripheral surface of the other end of the central shaft 44 and the inner peripheral surface 46b of the bottomed hole 46a of the rotating member 46, and the configuration of the power recovery device 24 'of this embodiment. The manufacturing cost can be reduced.

Furthermore, the low-pressure brine LPB that has entered a gap between the inner surface of the lid 43b of the housing 43 and the one side surface facing the inner surface in the rotating member 46 in the inner space 41 of the case 42a of the housing 43, and The mixture of the high-pressure brine HPB and the mixture of the low-pressure feed LPF and the high-pressure feed HPF are rotated on the outer peripheral surface of the other end of the central shaft 44 and the inner surface of the lid 43b and the one side surface of the rotary member 46 are rotated. It functions as a thrust bearing between. At the same time, the mixture of the low-pressure brine LPB and the high-pressure brine HPB entering the gap between the end surface of the other end portion of the central shaft 44 and the bottom surface of the bottomed hole 46 a of the rotating member 46 is the outer periphery of the other end portion of the central shaft 44. Along with the rotation of the rotating member 46 on the surface, it functions as a thrust bearing between the end surface of the other end portion of the central shaft 44 and the bottom surface of the bottomed hole 46 a of the rotating member 46. Further, the low pressure feed that has entered the gap between the lower surface of the inner space 41 of the case 42a of the housing 43 and the other side surface of the rotating member 46 in the inner space 41 of the case 42a of the housing 43 facing the bottom surface. The mixture of the LPF and the high pressure feed HPF is formed between the lower surface of the internal space 41 of the case 42 a and the other side surface of the rotating member 46 as the rotating member 46 rotates on the outer peripheral surface of the other end portion of the central shaft 44. It functions as a thrust bearing.

Therefore, between the inner surface of the lid 43b and the one side surface of the rotating member 46, between the end surface of the other end of the central shaft 44 and the bottom surface of the bottomed hole 46a of the rotating member 46, and the internal space of the case 42a. An independent thrust bearing is not required between the lower surface of 41 and the other side surface of the rotating member 46, and the configuration of the power recovery device 24 'of this embodiment can be simplified and the manufacturing cost can be reduced.

Claims

Raw water (SW), which is water supplied from the outside and containing a plurality of components, is sent to the reverse osmosis membrane (18a) via the pressure increase unit (16), and part of the water (HPSW) from the raw water (HPSW) in the reverse osmosis membrane. Raw water (HPF) that is used in the liquid processing apparatus to be extracted and is pressure-enhanced using the pressure of the remaining raw water (HPB) after a part of the water is extracted in the reverse osmosis membrane is supplied from the pressure increasing unit. In addition to (HPSW), a power recovery device that sends to a reverse osmosis membrane:
A housing (32, 43) having an internal space (30, 41); a central shaft having an outer peripheral surface (36b, 46c) fixed to the internal space of the housing and at least one end projecting to the outside of the housing ( 34, 44); and an inner peripheral surface (36a, 46b) which is rotatably accommodated around the outer peripheral surface of the central axis in the inner space of the housing and faces the outer peripheral surface of the central axis, and the radial direction of the central axis A plurality of passages (36c, 46c, 36b, 46c) having outer peripheral surfaces (36b, 46c) located on the outer sides and arranged at equal intervals in the circumferential direction of the central axis, each extending between the inner peripheral surface and the outer peripheral surface. A rotating member (36, 46) including 46d),
The interior space of the housing is provided with at least one pair of chambers (38a, 38b; 48a, 48b) which are two-to-one pairs facing the outer peripheral surface of the rotating member and partitioned from each other.
The central axis is formed on the outer peripheral surface of the central axis and faces at least one pair of chambers in the inner space of the housing through a rotating member, and has at least one pair of openings (40a, 40b) of the same number as the chambers. : 50a, 50b) and at least one pair of passages (42a, 42b: 52a, 52b) extending from the at least one set of openings into the central axis and opening at the at least one end of the central axis And formed,
One pair of chambers (38a; 48a) arranged symmetrically with respect to the central axis in the pair of chambers in the internal space of the housing is introduced with the introduction of raw water (LPF) supplied from the outside. Configured to rotate the rotating member by pressing the raw water in a predetermined circumferential direction of the outer peripheral surface against a plurality of passages on the outer peripheral surface of the rotating member exposed in the one pair of chambers,
The other pair of chambers (38b; 48b) disposed symmetrically with respect to the central axis in the pair of chambers is the raw water between the pressure raising unit (16) and the reverse osmosis membrane (18a). (HPSW) is connected to the passage,
One pair of openings (40a; 50a) facing the one pair of chambers (38a; 48a) through the rotating member in the pair of openings on the outer peripheral surface of the central axis corresponds to the central axis. Communicated to the outside through one pair of passages (42a; 52a),
The pair of openings (40b; 50b) facing the other pair of chambers (38b; 48b) through the rotating member in the pair of openings on the outer peripheral surface of the center axis corresponds to the center axis. The remaining raw water (HPB) is introduced through the other pair of passages (42b; 52b).
A power recovery device for a liquid processing apparatus.
The central axis (34) is elongated and has another end projecting out of the housing (32) on the opposite side of the central axis along the longitudinal centerline of the central axis;
The one pair of passages (42a) of the central axis (34) open to the one end of the central axis;
The other pair of passages (42b) of the central axis is open to the other end of the central axis;
The power recovery apparatus for a liquid processing apparatus according to claim 1.
The central axis (44) is elongated and is located on the opposite side of the one end along the longitudinal center line of the central axis and is accommodated in the internal space (41) of the housing (43). Has two ends,
The power recovery apparatus for a liquid processing apparatus according to claim 1.
The power recovery apparatus for a liquid processing apparatus according to claim 1, further comprising an electric motor (54) connected to the rotating member (46) and having an output shaft (54a) that rotates together with the rotating member. .
The power recovery apparatus for a liquid processing apparatus according to any one of claims 1 to 4, wherein the raw water (SW) is salt water.