JPS63209705A - Concentrator using membrane - Google Patents

Abstract

PURPOSE:To increase the effective area of a membrane per unit volume by coiling the membrane through a spacer, passing a fluid to be concd. and the vapor or liq. permeated through the membrane alternately through each coiled stage, and using the integrated membranes as a product. CONSTITUTION:A permeable membrane 1, a spacer 2 having a groove along the coil, the permeable membrane, and a spacer 3 having a groove in the lengthwise direction of the coil are successively laminated and coiled to form the concentrator. The liq. to be concd. is sent to the spacer 2 between two permeable membranes 1 through a liq. inlet nozzle 4, an inlet pipe 5, and a joining part with the permeable membrane 1 furnished in the lengthwise direction of the inlet pipe 5. The liq flows to the center of the coil in the direction as shown by the arrow 6, and the vapor flows to the spacer 3 through the permeable membrane 1. The concd. liq. is discharged from a liq. outlet nozzle 8 through an outlet pipe 7. Meanwhile, the vapor permeated through the permeable membrane 1 flows in the direction as shown by the arrow 6' through the spacer 3, and then flows out to the outside through the open end of the coil.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liquid concentrator using a membrane, and particularly relates to the structure of a concentrator using a membrane suitable for seawater desalination and waste liquid concentration. .

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 50-32564, a conventional device attaches a porous membrane to a cylindrical porous body using a synthetic resin.
Then along the vortex tube groove of the lower support.

A microporous body consisting of a porous body and a membrane was fixed, and an upper support body having spiral grooves similar to that described above was further applied thereon.

However, in the above-mentioned example, the technical model requires a manufacturing method in which a spiral groove is formed, a microporous body made of a porous body and a membrane is fixed thereon, and a support body having a spiral groove is further attached. be. In addition, compared to the conventional single membrane, the effective area has been increased by providing spiral protrusions.
It is about twice to several times as large as the conventional one.

Furthermore, an example is shown in which a filter is constructed by stacking two layers of filter media in which a microporous body consisting of a porous body and a membrane is fixed between the spiral grooves as described above; A pipe connecting certain filter media is required within the filter, and it is thought that sufficient consideration has not been given to installing the filter media and increasing the number of filter media from two stages to multiple stages.

[Problem that the invention seeks to solve]

The above-mentioned prior art requires, firstly, the need to attach the membrane with a resin, and secondly, the need for specially structured molded products with spiral grooves as supports for the upper and lower parts. Thirdly, when using multi-stage filter media, it is necessary to provide a connecting pipe inside the filter to connect the filter media.Fourthly, due to the limitations on throughput due to the properties of the membrane, ilJ! If it becomes necessary to increase or reduce the effective area of the material, there is no consideration given to the need to create a new support with spiral grooves, making the manufacturing method for the filter material difficult. In addition, there were other problems such as an increase in the number of parts, ease of installation when the filter medium is multi-staged, and difficulty in changing the effective area of the filter medium depending on the throughput.

The purpose of the present invention is, firstly, to use the product itself as a single-piece membrane without providing the membrane with a special shape such as a protrusion, and secondly, to improve the effectiveness per volume as a processing container. Thirdly, the effective membrane area can be easily changed depending on the processing container.

[Means for solving problems]

The above object is achieved by the structure shown below.

Two or more sheet-like membranes are stacked on top of each other.

A spacer is provided between the sheets. The spacer is provided to maintain a constant spacing between the membranes in order to facilitate the flow of fluid or vapor between the membranes, and to determine the flow direction of the fluid flowing between the membranes. As a result, the order of stacking the membrane and spacer is, for example, in the case of using two membranes, the order of membrane->spacer->film->spacer.

At this time, the direction of the grooves in which the fluid flows in the overlapping spacers is
Place two spacers on top of each other so that there is a difference of about 90''.

In this state, the membrane and spacer are wound and attached into a coil.

As a result, the order of the film and spacer on the radius when viewed from the top surface of the coil is to overlap from the outside in the order of film -> spacer -> layer -> spacer -> original film.

In this state, flow the fluid toward the spacer with the grooves in the direction of flow along the coiled membrane of the spacer whose flow groove direction has been changed by approximately 90' as described above. The steam that has passed through the membrane flows toward the spacer that has grooves in the longitudinal direction of the coil.

[Effect]

The basic concentrating mechanism of a concentrator using a membrane is to allow the fluid to be concentrated to flow through one side of the membrane, allowing only vapor to pass through the membrane and exit to the other side of the membrane. As a result, the fluid on the side to be concentrated is dehydrated and concentrated.

In the present invention, the basic effect of concentration using a membrane is the same, but the present invention has the following effect on how to increase the effective area of the membrane required for concentration compared to the volume of the concentrator. This was realized by

That is, as described above, although a layered membrane and spacer are wound into a coil, the fluid on the side to be concentrated is poured into the grooves that flow along the coil. Since the membrane is wound into a coil shape with a spacer in between, when viewed from the fluid flow path, the membrane is in contact with both sides with the spacer in between. Thus, while the fluid passes through the coil from the outside to the inside (or vice versa) along the spacer, water in the fluid passes through the membrane and is concentrated as it travels between the coiled membranes. .

On the other hand, the vapor that has passed through the membrane changes direction from the fluid before passing through the membrane, and flows in the longitudinal direction of the coil to exit the membrane.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.

FIG. 1 is a diagram showing one element of a concentrator. This has a structure in which a permeable membrane 1 and a spacer 2 with grooves along the coil are further provided with a permeable membrane, and then a spacer 3 with grooves along the longitudinal direction of the coil is layered and wound into a coil shape. There is.

Here, of both ends of the coil, both ends having spacers 2 on the side through which the fluid flows along the permeable membrane are sealed so that the fluid does not flow out from these ends. In addition, on the contrary, both ends of the spacer 3 in the direction in which the permeable membrane flows along the longitudinal direction of the coil shape are open, and can freely come out of the coiled permeable membrane.

Due to this structure, the liquid to be concentrated enters through the liquid inlet nozzle 4 and enters the inlet tube 5. The introduction pipe 5 has a joint with the permeable membrane 1 in the longitudinal direction of the pipe, and the liquid entering from the liquid inlet nozzle 4 is sent from here to the spacer 2 sandwiched between the two permeable membranes 1.

The liquid sent between the two permeable membranes 1 flows between the permeable membranes 1 in the direction of arrow 6 in detail B, and heads toward the center of the permeable membrane wound into a coil. During this time, vapor continues to flow from the liquid toward the other spacer 3 via the permeable membrane 1. In this way, the liquid entering from the liquid inlet nozzle 4 is concentrated as it moves toward the center of the coil, and then collected in the outlet pipe 7 and exits from the liquid outlet nozzle 8.

On the other hand, the vapor that has passed through the permeable membrane flows between the permeable membranes 1 along the spacer 3 in the direction of arrow 6' in detail B, and exits from the open end of the coil.

According to this embodiment, the time for the fluid to be concentrated to contact the permeable membrane for concentration is longer than in the conventional technique. That is, the effective area of the membrane can be increased. In the case of this example, since the flow flows while simultaneously contacting the membranes on both sides of the flow, and since the membrane is wound in a coil shape, by changing the length of the membrane wound in a coil shape, the liquid to be concentrated can be concentrated. It is possible to adjust the degree.

In addition, the vapor that has passed through the permeable membrane flows along the length of the coil and exits from the end of the coil, so the time it takes for the vapor to remain between the coiled membranes is opposite to that of the concentrated liquid. It is shorter and can be removed faster than conventional techniques.

FIG. 2 is an embodiment of a concentrator in which one element of the concentrator is attached to a container. Here, the liquid to be concentrated enters through the liquid inlet nozzle 4 and the concentrated liquid exits through the liquid outlet nozzle 8. On the other hand, the dry air that enters from the air inlet nozzle 9 flows between the membranes in the longitudinal direction of the coil, entrains the steam that comes out from the liquid to be concentrated through the membrane, and exits from the steam outlet nozzle 10. Get out.

The coiled permeable membrane is attached to the container body of the concentrator by a flange, and can be easily replaced by removing the flange.

FIG. 3 shows an embodiment in which the concentrator shown in FIG. 2 is made into a multistage type. The liquid to be concentrated enters through the liquid inlet nozzle 4, passes through the permeable membrane of the first stage concentrator, exits from the liquid outlet nozzle, enters the liquid inlet nozzle of the second stage concentrator, and is passed through the liquid inlet nozzle of the second stage concentrator. The stages are repeated and concentrated. By connecting multiple stages of concentrators in this manner, the contact area of the liquid to be concentrated with the permeable membrane can be further increased. Even in this case, the vapor is removed by dry air in each stage and does not directly enter the concentrators in other stages.

FIG. 4 shows the entire concentration system including the concentrator. The liquid stored in the waste liquid tank 11 enters the concentrator 12 and is concentrated, and then stored in the concentrated waste liquid tank 13.

On the other hand, the steam is sent to the concentrator 12 by the blower 14,
It enters the condenser 15 with steam, is concentrated and enters the condensation tank 16.

According to this embodiment, the membrane 1 and the vapor flow in the longitudinal direction of the coil and exit from the ends of the coil, so that the contact time with the membrane is minimized.

In this way, a concentrator with a small capacity and good concentrating effect can be obtained.

The area can be increased several times to several tens of times in a given container, and sufficient contact time with the membrane can be obtained, and the effective area of the membrane can be reduced by reducing the length of the membrane wound around the coil. It can be easily changed by changing.

[Brief explanation of the drawing]

Figure 1 is a perspective view (a) of an embodiment of the present invention and a detailed view of part B (
b) Figure 2 is a longitudinal cross-sectional view of one embodiment when it is assembled into a container, Figure 3 is a system diagram of the embodiment when the containers shown in Figure 2 are stacked in several stages, and Figure 4 is a diagram of the embodiment when the containers shown in Figure 2 are stacked in several stages. 1 is a system diagram showing the entire concentration system using the present invention. 1... Permeable membrane, 2... Spacer, 9... Air inlet nozzle, 1o... Steam outlet nozzle.

Claims (1)

[Claims] 1. A concentrating device comprising a membrane having the property of permeating vapor or liquid, a fluid to be concentrated on one side of the membrane, and a chamber in which the vapor or liquid that has permeated through the membrane flows on the other side. , characterized in that the membrane is wound into a coil, a spacer is provided between the membranes, and the liquid to be concentrated and the vapor or liquid that has permeated through the membrane flow alternately through each stage of the coil. A concentrator that uses a membrane that