JPS5918085B2 - Rotary liquid separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energy-saving rotary liquid separator using a separation module that does not reduce permeation performance due to deformation or blockage even in a field where a strong centrifugal force acts.

Evaporation method is a method for separating liquids to be separated such as seawater and acupuncture water.
There are methods such as the reverse osmosis membrane method, and evaporation methods such as the multi-stage flash method are most commonly used for desalination of seawater.
Since the evaporation method requires a large amount of energy, the advantages of the reverse permeation membrane method have recently been recognized.

However, in the conventional separation method that uses a reverse permeation membrane and applies high pressure to the liquid to be separated using a high-pressure pump, the concentrated liquid that is discharged contains high-pressure energy, but that energy is not used effectively and is wasted. At present, it is released to the outside.

To correct this problem, a separation method has recently been proposed in which high pressure is applied to the liquid to be separated using centrifugal force generated by rotating a reverse permeation membrane module at high speed.

In this method, the liquid is supplied and discharged near the center of the rotation axis, so it has the advantage of almost eliminating energy loss due to wasteful discharge of high-pressure drainage liquid, but it is also known as a reverse permeation membrane module. When using a spiral type module formed by winding a membrane or a hollow fiber type module formed by aggregating multiple hollow fibers in the length direction, the module Because the inside of the membrane is deformed, the normal flow of the liquid to be separated and the permeate is interrupted, and pressure may also be generated on the permeate side, which significantly impedes the separation ability of the membrane. be.

The present invention aims to eliminate the drawbacks of the separation method using the reverse permeation membrane, and uses centrifugal force to obtain the high liquid pressure required for the separation module. By employing a separation module inside that is unlikely to be deformed or blocked, it is configured to minimize energy loss and reduce the drop in separation ability as much as possible.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is a vertical rotary liquid separator main body;
A rotating shaft 2 that is rotatably supported and has a liquid supply hole 2a and a liquid drain hole 2b, and a plurality of flat separation elements that are installed in a radial manner around the rotating shaft and that are equipped with selectively permeable membranes. A closed space C8 through which the liquid to be separated passes through is formed in the longitudinal direction of the rotating shaft, and an open space O8 through which permeated water is led out into the flat separation element is formed in the lateral direction of the rotating shaft. A laminated flat-plate separation module 3, an annular liquid distribution pipe 4b located above the separation module surrounding the rotation axis and communicating with the liquid supply path end 4cl of the separation module, and a ring-shaped liquid distribution pipe 4b located below the separation module. An annular liquid collecting pipe 5b is positioned to surround the rotating shaft and communicates with the drain end 5c1 of the separation module. Piping systems 4a, 4c, 5c, and 5a for returning the liquid (concentrated liquid) that has passed through the module 3 and returning it to the drain hole 2b of the rotating shaft and discharging it to the outside; It mainly consists of a water collector 6 having a fixed annular wall that collects the discharged permeate.

Next, the structure of the above-mentioned main components will be explained in detail.

First, the rotating shaft system will be explained.

The upper end of the rotating shaft 2 is rotatably supported by a bearing 20T, and the bearing 20T is supported by a non-rotating support frame 2d, while the lower end is rotatably supported by a bearing 20B. The bearing 20B is supported by the support frame 2d.

Further, a pulley 9a is installed on the rotating shaft, and a motor 9 installed on the support frame is connected via a transmission bell l-9b.
transmits the rotational force to the rotating shaft.

The liquid supply hole 2a formed in the rotating shaft 2 is connected to a rotary joint 2a1.
It communicates with the liquid to be separated supply port 2a2 through the .

This applies even if the drain hole 2br gets stuck.
Those corresponding to 2a2 are shown as 2b1 and 2b2.

Next, the liquid supply and drainage system will be explained.

The liquid supply path 4 includes a liquid supply pipe 4a, an annular liquid distribution pipe 4b, and a liquid separation pipe 4c.

That is, one end of the liquid supply pipe 4a, which is the starting end of the liquid supply path 4, is communicated with the liquid supply hole 2a provided in the rotating shaft, the other end is communicated with the annular liquid distribution pipe 4b, and the liquid separation pipe 4c One end thereof is communicated with the annular liquid distribution pipe 4b, and the other end, which is the terminal end of the liquid supply path, is communicated with the separation module 3.

The liquid drain path 5 is also constituted by a liquid drain pipe 5a, an annular liquid collecting pipe 5b, and a liquid collecting pipe 5c like the liquid supply path, and the starting end of the liquid drain path 5, that is, one end of the liquid collecting pipe 5c is connected to the separation module. 3
The other end is connected to the annular liquid collecting pipe 5b.

One end of the liquid drain pipe 5a is communicated with an annular liquid collection pipe 5b,
The other end, that is, the terminal end of the drain path is communicated with a drain hole 2b provided in the rotating shaft 2.

The method of installing the separation module is as follows.

As is clear from FIG. 2, a plurality of said separation modules 3
are arranged radially around the rotating shaft 2, and each separation module 3 has an annular liquid distribution pipe 4b and an annular liquid collecting pipe 5b.
Module mounting arms 4b1 and 5b protruding from
1 and a mounting arm 3a provided on the separation module 3.
and 3b are connected with pins T to be fixed between the annular liquid distribution pipe 4b and the annular liquid collecting pipe 5b.

Therefore, these annular pipes 4b and 5b serve as support members for the separation module, and as a result, they serve both as a liquid path forming member and a support member for the separation module.

Further, the annular tubes 4b and 5b are supported by support arms 8U and 8L fixed to the rotating shaft 2.

Next, the laminated flat plate type separation module 3 will be explained based on FIGS. 3 to 10.

A large number of thin water guide holes a shown in FIG. 9 are raised to match the water guide grooves of a separator 3c2□, which will be described later, and a liquid supply hole i and a drain liquid guide hole 0 are provided at both ends in the longitudinal direction.
A thin rectangular supporting member 3c22 is formed of a rectangular plate material having a liquid supply hole i and a liquid draining hole 0 at the same position as the supporting member shown in FIG. An open space O8 is created by providing a large number of water guide grooves that open to the
The separators 3c2 formed with a
11 and a water guiding material 3c2□.

] are brought into close contact to constitute one plate-like separation element 3c equipped with a selectively permeable membrane.

Then, a large number of these flat separation elements are stacked in a stacked manner by inserting spacer plates 3d shown in FIG.
Tighten up with Natsuto N.

In this way, a multilayer closed space C8 is formed in the gap between each element.

This multilayer closed space passes through each separation element and is communicated with a liquid supply hole i and a liquid discharge hole 0 provided near both ends of the separation module.

These guide holes communicate with a liquid supply hole i and a liquid drain hole 0' provided in the two holding plates 3e, respectively.

The periphery of the guide hole of each separation element 3c is an adhesive member 3c.
13 to prevent the liquid to be separated from flowing into the open space from the closed space through the peripheral wall of the guide hole. Align with the axial direction of (
If necessary, the side of the drain hole may be tilted outward.

) The lateral axis (horizontal axis) of the separation module is aligned perpendicularly to the axis of the rotating shaft (an inclined angle may be provided as necessary).

) The above-mentioned mounting is fixed according to the direction. The operation of the rotary liquid separator of the present invention constructed as described above will be explained below using an example in which it is used for desalination of seawater in which the liquid to be separated is seawater.

Seawater enters the annular liquid distribution pipe 4b from the liquid supply hole 2a of the rotating shaft 2 via the liquid supply pipe 4a, and is then supplied to the laminated flat plate type separation module 3 via the liquid separation pipe 4c, and after passing through there, it is concentrated. The drained water is led to the annular liquid collection pipe 5b via the liquid collection pipe 5c, and is then discharged through the liquid drainage hole 2b via the liquid drainage pipe 5a.

At this time, since the separation module 3 is rotating around the rotation axis, the seawater passing through the separation module is made high pressure by the action of centrifugal force.

That is, the high-pressure seawater introduced into the closed space C8 through the guide hole i of the separation module descends in the axial direction of the rotating shaft while contacting the selectively permeable membrane body, such as the reverse permeation membrane 3c11, on the surface of the separation material 3c1. .

A portion of the high-pressure seawater flowing on the surface of the reverse permeation membrane 3c11 passes through the separation material 3C1l as a result of the reverse permeation phenomenon.

That is, salt classification and pure water in seawater are separated, and seawater is desalinated.

The permeated water (pure water) that has passed through the separation material reaches the open space O8 in the flat separation element 3c, flows laterally due to the action of centrifugal force, is released from the side of the separation module to the outside, hits the fixed annular wall, and descends. The water is finally collected in a water collector 6.

On the other hand, the concentrated seawater is drained from the drain hole 0 to the drain pipe 5.
The pressure gradually decreases as it progresses toward the center of the rotating shaft along a, and finally the pressure gradually decreases as it progresses from the drain hole 0 of the rotating shaft to the center of the rotating shaft along the drain pipe 5a. When the liquid is discharged from the drain hole 2b of the rotating shaft, almost no pressure is maintained.

Therefore, there is no wasteful energy loss unlike the conventional method of draining water under high pressure.

In the above explanation, it was mentioned that the laminated flat plate type separation module performs the separation action by effectively utilizing the high water pressure generated by the centrifugal force caused by the rotation of the rotating shaft, but in this case, what is important is the configuration of the separation module. However, even in the field of strong centrifugal force, internal deformation or blockage is almost impossible.

In other words, the separation materials and elements that make up the separation module are plate materials, which are stacked and arranged in the direction of centrifugal force, making them less susceptible to centrifugal force. This is because the gas is immediately discharged from the rotating system without increasing the pressure.

In the above embodiments, a device using a liquid supply hole and a liquid drain hole provided on the rotating shaft as the liquid supplying means and liquid draining means was exemplified, but the present invention is not limited to this. Alternatively, any type may be adopted as long as the liquid can be supplied and drained from the vicinity.

Further, although this embodiment shows a vertical type in which the rotating shaft is vertical, it goes without saying that similar effects can be obtained even if the rotating shaft is made horizontal in a horizontal type.

As is clear from the above description, the present invention exhibits the following excellent effects.

(1) It is possible to recover the energy of the high-pressure liquid and reduce energy loss as much as possible, and to obtain a stable separation effect without damaging the separation function even in the field of strong centrifugal force. Furthermore, the annular distribution/liquid collection pipe forming part of the liquid path also serves as a support member of the separation module.

Therefore, the structure can be simplified, which is extremely valuable in practice.

(2) A large number of laminated flat separation modules are mounted on the outer circumference of the rotating shaft, and spacer plates and flat separation elements are alternately stacked between two holding plates, and the holding plate Since the flat separation elements are attached along the longitudinal direction and radial direction of the rotating shaft, a closed space can be easily formed between the flat separation elements.

Moreover, the liquid to be demineralized supplied to the closed space generates a turbulent flow and moves in the longitudinal direction of the rotating shaft while cleaning the reverse permeation membrane surface of the flat separation element, and during that time, the fresh water flows along the membrane surface. It can pass approximately at right angles to the radial direction.

(3) By providing the flat separation elements in the radial direction, the membrane area of the flat separation elements can be increased, and a large amount of seawater can be desalinated.

(4) A flat separation element consists of a separator having a water guide groove that opens outward in the radial direction, sandwiched between support plates having water guide holes that align with the water guide grooves of the separator, and a reverse permeation membrane placed on the support plate. Since the separator is provided with the separator, even if high pressure is applied to the separator, the pressure can be received by the support plate, and the pressure resistance of the separator can be improved.

(5) Since the water guide grooves of the separator are opened radially outward, an open space is formed therein, and the fresh water that has passed through the separation material can be easily discharged radially outward.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the rotary liquid separator of the present invention, FIG. 2 is a plan view of the device shown in FIG. 1, and FIG. 3 is a side view of a laminated flat plate separation module used in the device shown in FIG. , FIG. 4 is a plan view of the laminated plate-like separation module shown in FIG. 3, FIG. 5 is a sectional view taken along the line ■-v in FIG. 4, and FIG.
7 is a cross-sectional view of a flat separation element equipped with a selectively permeable membrane constituting the laminated flat plate separation module shown in FIG. 3; FIG. 8 is a sectional view of the laminated flat plate separation module shown in FIG. 3. FIG. 9 is a plan view of a support plate used in the flat separation element of FIG. 7; FIG. 10 is a plan view of a spacer used in the flat separation element of FIG. 7. It is a diagram. In the figure, 1 is a rotary liquid separator, 2 is a rotating shaft, 3 is a laminated flat plate type separation module, 3c is a flat plate type separation element, C
8 is a closed space, O8 is an open space, 4a is a liquid supply pipe, 4b is an annular liquid distribution pipe, 5a is a drain pipe 5b is an annular liquid collection pipe, and 6 is a water collector.

Claims (1)

[Claims] 1. A large number of laminated flat plate separation modules are installed on the outer circumference of a rotating shaft rotatably supported within a support frame, and an annular liquid distribution pipe and each laminated flat plate supply the liquid to be treated into each of the laminated flat plate separation modules. Annular liquid collecting pipes for collecting the concentrated liquid from the laminated plate-like separation module are provided along the upper and lower sides of the laminated plate-like separation module, respectively, and a liquid supply for sending the liquid to be separated to the annular liquid distribution pipe from the rotating shaft or the vicinity thereof. In the rotary liquid separator, the rotary liquid separator is provided with a pipe, a discharge pipe is provided for discharging the concentrated liquid of the annular liquid collection pipe from the rotating shaft or the vicinity thereof, and a water collector is provided on the inner periphery of the lower part of the support frame. A laminated flat module is formed by alternately stacking spacing plates and flat separation elements between two holding plates, and the holding plates and flat separation elements are arranged along the longitudinal direction of the rotating shaft and in the radial direction. The flat separation element is formed by stacking support plates having a large number of water introduction holes on both sides of the separator, and then stacking a separation material made of a reverse permeation membrane on the support plate surfaces on both sides. Further, a large number of water guide grooves are formed in the separator to align with the water guide holes of the support plate, and the water guide grooves are opened outward in the radial direction of the rotating shaft to form an open space, and the adjacent flat separation element A rotary liquid separator characterized in that a closed space is formed in the spacer plate between them, and the closed space is communicated with the annular liquid distribution pipe and the annular liquid collection pipe.