JPS602883B2 - Rotary solution concentrator - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary solution concentrator.

Evaporation methods are generally used to concentrate solutions, but
This requires a large amount of energy and may even lead to deterioration of the liquid to be concentrated due to heat.

For this reason, a solution concentrator of the reverse filtration type that performs purification and concentration by a solution separation method that utilizes the reverse filtration phenomenon of a semipermeable membrane is being developed. In the reverse pus-permeation type concentrator, separation modules such as a parallel type, a spiral type, and a hollow fiber type are used, but a tube type separation module is particularly suitable for concentration.

A flat plate laminated separation module, which is a development of this tube separation module, can also be used for concentration. (Please refer to Akiaki Hakama No. 52-6067 and Japanese Patent Application Akihiro No. 35776) Among the reverse horse mackerel purulent solution concentration devices that have been developed so far, there are the following three types.

One method is to supply a high-pressure solution with a high-pressure pump to a plurality of serially connected separation modules, with or without an ascending pump interposed in the middle of the separation module connection pipe. This is a serial system in which the solution is separated into permeated water and concentrated liquid by the reverse permeation effect of each separation module to obtain the concentrated liquid.

This method requires a large number of separation modules, and in addition, since the separation modules are connected in series, the flow rate of the solution on the membrane surface gradually slows down, which not only prolongs the time required for concentration, but also The cleaning effect due to the flow rate also gradually weakens, resulting in deterioration and clogging of the separation module. Therefore, it is not suitable for high concentration. The second method is to supply a solution containing a certain amount of solution to a group of series separation modules connected in parallel via a high-pressure pump, and then lead the separated concentrated liquid to the above-mentioned tank to reach a predetermined concentration. It is a repeated circulation method.

This method requires a relatively small number of separation modules, but
The high pressure solution coming out of the separation module returns to the normal pressure chamber, resulting in a large energy loss. Furthermore, if the number of circulations increases, the temperature of the liquid increases, which affects the quality of the concentrated liquid and the life of the membrane, so there are disadvantages such as the need to use a temperature controller. The third method replaces the solution tank in the second method with a pressure tank, and while maintaining the required pressure in the concentration system, replenishment of the solution equivalent to the amount of permeated water is injected from the supply system into the concentration system. It is a pressure accumulation circulation method. This method prevents the large energy loss caused by returning the high-pressure solution to the normal pressure tank after each circulation as in the first method, but the energy to raise the pressure of the solution to the required pressure and the energy to circulate it are lost and the liquid Since temperature rise is inevitable, a temperature controller is also required, and a robust pressure tank (system) is also required, resulting in a disadvantage of increased equipment costs. The present invention solves the drawbacks of the conventional method as described above, and even if the elements in the separation module are arranged in series, the present invention can be installed so that the solution is diverted from the side (inside) near the center of rotation to the outside. This is advantageous in terms of performance because the working pressure is higher on the outer side where the concentration is higher, and it also has the added advantage of adding heat dissipation effect using rotation.

Therefore, the present invention supplies and collects a solution via a rotating shaft to a selective permeable membrane separation module that rotates with the rotation of the rotating shaft, and repeats this process to circulate the solution and increase the concentration of the solution. Either increase the rotational speed of the rotating shaft according to the situation, or keep the amount of circulating fluid constant, or
It is an object of the present invention to provide a rotary solution concentrator that solves the above-mentioned drawbacks by controlling both of these aspects. A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a rotary solution concentrator 1 of the present invention.

The solution concentrator 1 is rotatably supported on a support horizontal body 2 by a bearing 3c, and has a rotating shaft 3 having a liquid supply section 3a and a liquid storage section 3b.
and to the liquid supply section 3a and the liquid collection section 3b.The selective permeable membrane separation module 4 passed through the circulation path 5 formed between the liquid collection section 3b and the liquid supply section 3a rotates according to the concentration level. Interposed between the rotation speed control means 7 for controlling the rotation speed of the shaft 3 and the circulation path 5,
It mainly consists of liquid supply amount constant means 8 that controls the amount of liquid supplied to the liquid supply section 3a according to the concentration level, and a liquid supply path 9 to the circulation path 5.
A mulberry water means 10 for collecting permeated water from the separation module 4 is also provided. The liquid supply part 3a of the rotating shaft 3 has a liquid passage hole 3a formed in the upper part of the rotating shaft 3, an annular liquid supply pipe 3a2 supported by a support arm 3f fixed to the rotating shaft 3, a liquid passage hole 3a, and an annular liquid passage hole 3a. A required number of liquid supply pipes 3a3 and an annular liquid supply pipe 3a that pass through the liquid supply pipe 3a2.
2 and a connecting pipe 3a4 that passes between the liquid inlet 4a of each separation module 4. The recovery section 3b of the rotating shaft 3 includes an annular liquid collection pipe 3Q, a reach pipe 3b4 that allows the passage between the liquid outlet 4b of each separation module 4 and the annular liquid collection pipe 3b2, a liquid passage hole 30, and an annular liquid collection pipe 3b2. It consists of a liquid collection pipe 3b3 that allows the liquid to pass between the liquid passage hole 3b and the liquid passage hole 3b.

The arms 3d and 3e provided for each separation module to be installed between the annular liquid supply pipe 3a2 and the annular liquid collection pipe 3b2 and the arms 4c and 4c provided at the longitudinal ends of each separation module are connected with pins, respectively. Each separation module 4 is connected by P and rotates together with the rotating shaft 3, making it possible to supply and collect liquid. The separation module 4 used for this is constructed as follows, but the separation module that can be used in the present invention is not limited to this, and the flat plate laminated type separation module described above can also be used. The separation module 4 is shown in FIGS. 3-5. An upper weight body 4z and a lower weight body 4x are fixed between two supporting members 4t provided with an arm 4c. An outer cylinder 4g that can withstand the applied pressure is passed through the hole 4w in the bottom 4y of the upper bonito body 4z and the hole 4w in the upper wall 4u of the lower weight body 4x, and the outer cylinder 4g, the bottom 4y, and the upper wall 4u are connected to each other. to fix. These are also fixed by some fixing plates 4s. The upper blind body 4z has a liquid inlet 4a and a partition wall 4e, and by fixing the lid 4d to the bulge 4z, the lid 4f.・4
f2/4 is also partitioned into each part of f4/4f4. 41. By similarly fixing the lid 4d to the lower body 4x.・412
・The inlet port 4a is assembled in such a way that the solution can flow between the inner surface of the outer cylinder 4g and the outer surface of the membrane separation element 4h forming the inner cylinder, which are partitioned into the respective parts 413 and 414.
The solution flowing from 4f, 41, 4f2-412
-4f3-413-4 The liquid flows out of the module through the liquid outlet 414 and the liquid outlet 4b. The nape of the pus separation element 4h is partially supported by an outer cylinder 4g, and the intermediate part is supported by, for example, spiral sections 4i at predetermined intervals, and the lower end 4m of the element is attached to a support plate 4n. , to which intermediate plate 4
By inserting the cap 4x and fixing the lower body 4x and the lid 4d as described above, they are all fixed watertight and the solution passage 4 is secured.
f, 41, 4f2-412-4f3-413-4f
4-414, and the permeated water introduced into the element inner hole 4h can be guided to the outlet 4r via the permeation collection channel 4o formed by the intermediate plate 4p and the support plate 4n. The circulation path 5 that sends the concentrated liquid collected from the liquid outlet 4b of the separation module 4 through the liquid collection part 3b to the liquid supply part 3a includes a rotary joint 5a, and first and second tanks 5b and 5c.
, a pipe 5d connected to the rotary joint 5a, pipes 5e and 5f conveyed to the first and second pots, a pipe 6d and a pipe 5e
and 5f, the first and second control valves are interposed between
The pipes 5h and 5i are transported to the pipes 5b and 5c, and the pipe 5i is connected to the pipe 5k via the liquid supply pump 8 Ze.
, a switching valve 51 interposed between the pipes 5h and 5i and the pipe 5j, and a rotary joint 5m connecting the pipe 5k to the liquid supply section 3a.

The rotational speed control means 7 includes a signal generator 7a that generates a rotational speed control signal according to a preset concentration time schedule or a signal from the detection means 6 via or without the switch 6a. A three-phase shunt-wound commutator motor including a motor 7b capable of forward and reverse rotation in response to a signal from the motor 7a, a transmission mechanism 7C connected to the rotating shaft of the motor 7b, and a commutator moving mechanism 7d connected to the transmission mechanism 7c. 7d, and a transmission mechanism for transmitting the rotation of the electric motor 7d to the rotating shaft 3, such as a belt mechanism 7e.

The liquid supply amount constant means 8 includes a signal generator 8a that generates a control signal according to a concentration time schedule or a signal from the detection means 6 with or without the switch 6a.
, an electric motor 8b capable of forward and reverse rotation in response to a signal from a signal generator 8a, a transmission mechanism 8c connected to the rotating shaft of the electric motor 8b, and a three-phase shunt winding device in which a commutator moving mechanism 8d is connected to the transmission mechanism 8c. type commutator motor 8d, and a liquid supply pump 8e connected to the rotating shaft of the motor 8d via a joint 8d2.
Consists of.

The detection means 6 includes, for example, concentration detectors 6b and 6c disposed in the first and second tanks 5b and 5c, or a permeated water amount detector.The liquid supply path 9 is connected to a liquid supply source (not shown). A switching valve 9d is interposed between the pipe 9a and the pipes 9b and 9c which extend through the first and second tanks 5b and 5c.

The permeated water building means 10 includes an annular permeated water receiver 10a and a permeated water tank 1.
A pipe 10c is passed between the permeated water tank 10b and the permeated water tank 10b, and the pipe 10d is transported to a drainage ditch or to a refurbished facility.

The operation of the solution concentrating device 1 of the present invention configured as described above will be explained below. The switching valve 9d is switched so as to connect the pipe ga to the pipe 9b, and the solution to be concentrated (liquid to be concentrated) is supplied from a supply source (not shown) to the first tank 5b to fill it.

Further, the switching valve 51 is also switched to connect the first tube 5b to the pipe 5i. Upon completion of such start-up operations,
It is assumed that the circulation system of the solution concentrator 1 is filled with the solution by known means. The signal generator 7a controls the electric motor 7b to set the commutator moving mechanism 7d to a position where the rotating shaft 3 can be rotated at a predetermined rotational speed.

At the time when the rotational speed of the rotary shaft 3 reaches a predetermined rotational speed, the liquid supply pump 8e is activated.

The amount of liquid supplied from the liquid supply pump 8e is a value that allows the flow velocity from the liquid inlet 4a into the module 4 to be a predetermined flow velocity, and this value is determined by the signal generator 8a to the three-phase shunt type commutator fin motor 8.
An electric motor 8 that controls the positioning of the commutator moving machine 8d of d.
It can be set by controlling b. Thus, the first
The liquid to be concentrated (solution) flowing from the sap 5b through the circulation path 5 and the liquid supply section 3a into the separation module 4 at a predetermined flow rate flows through the liquid passages 4f, → 41, → 4f2 → 412 → 4f3 → 413 →
During each liquid passage from 4f4 to 414 (see Figure 4),
Element 4) Maintains a predetermined pressure due to centrifugal force due to rotation.
h and is separated into permeate and concentrate.

The separated permeated water flows down the inner hole 4h of the element 4h, flows radially outward through the blind waterway 4o, and is discharged from the permeated water outlet 4r to the outside of the module 4, where it is sent to a permeated water collection consisting of a permeated water receiver 10a, etc. Water is sent to a predetermined location via means 10.

On the other hand, the solution (concentrated liquid) that has been concentrated by acting on each element 4h as described above flows from the liquid outlet 4b to the liquid collecting section 3.
b and is returned into the circulation path 5.

The more you repeat the circulation and concentration of such a solution, the more you repeat the circulation, the more concentrated the solution becomes, and the more concentrated the solution becomes. In this way, even if the concentration of the solution progresses, the signal generating device 7a will rotate the solution according to a preset time schedule or in response to the concentration signal from the detection means. The rotational speed of the commutator motor 7d is increased so as to rotate the separation module at a rotational speed (rotational speed) that provides the separation module with an operating pressure corresponding to the speed or concentration. Similarly, even if the solution becomes concentrated, the amount of liquid supplied is kept approximately constant so as to maintain a flow rate suitable for separation, that is, a predetermined flow rate that does not cause deterioration of separation performance within the separation module 4. In order to maintain this, the signal generator 8a controls the rotational speed of the liquid supply pump 8e, in other words, the commutator crab motor 8d.

While such concentration control is in progress, liquid is supplied to the other sieve, in the case of the above example, the second sieve 5c, by switching the switching valve 9d.

Then, when a concentrated liquid having a predetermined concentration level is obtained, the switching valve 51 is switched so that the solution in the second sieve 5c is
While the concentration progresses as described above, the switching valve 9d is switched to the first
The concentrated liquid is transferred to another storage tank or the like from the cassette 5b.

After the concentrated liquid from the tank 5b is sent to another storage tank, the liquid is supplied to the tank 5b in preparation for the next concentration process as described above.

Such alternating concentration processing enables continuous concentration of the liquid to be concentrated.

Also, before and after the concentration process, the first and second tanks 5b and 5
By supplying a cleaning liquid such as water, detergent, etc. to one or both of the pumps 8e and 8e and operating the liquid supply pump 8e without or with rotation, the apparatus can be cleaned without any other means.

This cleaning can also be incorporated into a time schedule and run automatically and continuously. In the above embodiment, a case has been described in which the separation module 4 is provided in a single layer, but the present invention can also be applied to a case in which the separation module 4 is provided in multiples at different radial positions.

Further, the rotational speed control means may use another variable remote electric motor as its transmission means, or may connect the rotational shaft of a prime mover with a fixed rotational speed to the rotational shaft via a transmission mechanism.

As is clear from the above explanation, according to the present invention, (1) the rotational speed of the separation module is increased as the concentration of the liquid to be concentrated progresses; Reasonable concentration can be achieved at an appropriate operating pressure, and even if the concentration of the liquid to be concentrated progresses, the amount of liquid supplied is controlled to remain constant, so there is no drop in separation performance as with conventional equipment. ■ Therefore, high concentration is possible, ■ Continuous automatic operation including cleaning is possible, resulting in labor savings, and ■ Since energy recovery is also performed in the present invention, it is much more energy efficient than conventional equipment. Excellent effects such as the following are achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view of the device of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a sectional view taken along line m-m in Fig.
The figure is a sectional view taken along the line N-W in Figure 3, and Figure 5 is a cross-sectional view taken along the line N-W in Figure 3.
- It is a sectional view taken along the line V. In the figure, 1 is a solution concentrator, 3 is a rotating shaft, 3a is a liquid supply part,
3b is a liquid collection part, 4 is a separation module, 5 is a circulation path, 7 is a rotation speed control means, and 8 is a liquid supply amount constant means. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Supply liquid through a liquid supply portion of the rotating shaft to a selectively permeable membrane type separation module that is provided at a predetermined position in the radial direction of the rotating shaft so as to be able to rotate together with the rotating shaft, and in the selectively permeable membrane type separation module. A rotary solution concentrator that collects a concentrated solution through a liquid collecting section of the rotating shaft and circulates the solution to the liquid supply section via a circulation path until the solution reaches a predetermined concentration level. a rotational speed control means for increasing the rotational speed of the rotating shaft according to an increase in the concentration of the solution; and a liquid supply that is interposed in the circulation path and that keeps the amount of liquid supplied constant even if the concentration of the solution increases. 1. A rotary solution concentrator, characterized in that it is provided with a volume constant means.