JP2001120911A - Rotary filtering device with filter medium cleaning function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently catch and recover suspended material contained in a liquid. SOLUTION: A supply means 14 supplies the liquid 12 containing the suspended material 11 into a liquid tank 13 and a double cylindrical body 16 is provided in the liquid tank 13 rotatably around an axial line with a part of an outer cylinder 17 and a part of an inner cylinder 18 projected from a liquid surface. Filter medium 21 is accommodated in a filtration space 19 so as to be able to flow and not to be able to leak therefrom and the filter medium catches the suspended material. A rotating means 43 rotating-drives the double cylindrical body and a draining means 46 discharges the liquid passed through the filter medium from inside of the inner cylinder to outside of the liquid tank. Partition plates partition the filtration space into small spaces, a cleaning nozzle 54 above the outer cylinder sprays a cleaning liquid 60 onto the filter medium in the small space above the liquid surface to remove the suspended material from the filter medium. A liquid collecting vessel 63, which is located inside the inner cylinder and is fixed to the liquid tank 13, collects the cleaning liquid sprayed from the cleaning nozzle together with the suspended material and a guiding tube 64 guides the cleaning liquid containing the suspended material in the liquid collecting vessel 63 to an unfiltered liquid outside the double cylindrical body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary filtration device for capturing and recovering suspended substances such as supersaturated silica contained in a liquid such as geothermal hot water. More specifically, the present invention relates to a rotary filtration device having a function of washing a filtering material having captured suspended substances.

[0002]

2. Description of the Related Art The present applicant has proposed a filter device of this type,
A substantially cylindrical fluid circulating container is disposed so as to be rotatable in the circumferential direction around its axis, and a filtering material for capturing and separating suspended substances in a fluid flowing in from the outside into the container is allowed to flow. A patent has been filed for a fluid filtration device that is accommodated and configured so that the flow of the filter medium is promoted by the flow stirring assisting means (Japanese Patent Application Laid-Open No. H11-90116). In this fluid filtration device, the flow-stirring assisting means is a plate-shaped scraping plate provided at a predetermined interval in the circumferential direction in the fluid-flowable container, or a stirring rice feed and a stirring rod member. An adhering matter removing member or a fluid ejection cleaning mechanism is provided on the outer peripheral surface or above the fluid circulating container. As the attached matter removing member, a brush member that comes into contact with the outer peripheral surface of the fluid circulating container may be mentioned, and as the fluid ejection cleaning mechanism, an injection nozzle disposed above the fluid and directed toward the outer peripheral surface of the fluid circulating container. When,
A pump having a pump for pumping a fluid to the spray nozzle.

[0003] In the fluid filtration device configured as described above,
During rotation of the fluid-flow container, the filter medium comes into contact with the flow-stirring assisting means to promote the flow, so that foreign matter or sludge adhering between the filter materials or on the filter medium surface is discharged out of the fluid-flow container. At the same time, a portion of the filter material is worn and eluted and diffused into the fluid. When the filter media is worn, its physicochemical function is restored, and when the particle size of the filter media becomes smaller, it becomes possible to capture fine suspended substances, and when the filter media becomes smaller than the opening of the fluid-flowable container. Is discharged from this container. On the other hand, extraneous matter such as foreign matter and sludge adhering to the outer peripheral surface of the fluid circulating container is removed by the extraneous matter removing member or the fluid ejection cleaning mechanism. As a result, the suspended substance in the fluid can be separated by filtration, and can be discharged into the fluid together with the filter medium captured and separated by the filter medium.

[0004]

However, in the conventional fluid filtration apparatus described in Japanese Patent Application Laid-Open No. H11-90116, the flow of the filtration material cannot be sufficiently promoted only by the flow stirring assist means. There is a possibility that the ability of the material to capture suspended substances may be reduced. An object of the present invention is to efficiently capture suspended substances contained in a liquid with a filter medium without decreasing the ability of the filter medium to capture suspended substances by sequentially washing the filter medium that has captured the suspended substances. It is an object of the present invention to provide a rotary filtration device with a filtering material washing function. Another object of the present invention is to provide a rotary filtration device with a filtration material washing function that can efficiently collect suspended substances separated from the filtration material.

[0005]

The invention according to claim 1 is
As shown in FIG. 1 and FIG.
A liquid tank 13 for storing the liquid 2, a supply means 14 for supplying the liquid 12 to the liquid tank 13, a liquid-permeable outer cylinder 17, and a liquid-permeable inner cylinder 18 substantially concentric with the outer cylinder 17. A double cylinder provided in the liquid tank 13 so as to be substantially horizontal and part of the outer cylinder 17 and the inner cylinder 18 protruding from the liquid surface of the liquid 12 so as to be rotatable in the liquid 12 in the circumferential direction about the axis. Body 16, outer cylinder 17 and inner cylinder 1
A filter medium 21 that is housed in a filtration space 19 surrounded by the filter 8 so as to be able to flow and cannot leak from the filtration space 19 and captures the suspended substance 11 and separates it from the liquid 12, and a rotation that rotationally drives the double cylinder 16. Means 43 and a drainage means 46 for discharging the liquid 12 supplied to the liquid tank 13 and passing through the filter medium 21 from the inside of the inner cylinder 18 to the outside of the liquid tank 13 while keeping the liquid level in the liquid tank 13 constant. And a rotary filtration device comprising: The characteristic configuration is that a plurality of partition plates 1 are provided radially about the axis to partition the filtration space 19 into a plurality of small spaces 19b.
9a and the suspended substance 11 captured by the filter medium 21 by injecting the cleaning liquid 60 into the filter medium 21 in the small space 19b provided above the outer cylinder 17 or inside the inner cylinder 18 and located above the liquid level.
Cleaning nozzle 54 for removing air from filter medium 21 and inner cylinder 1
The cleaning liquid 60 fixed to the liquid tank 13 and sprayed from the cleaning nozzle 54 is collected together with the suspended substance 11 separated from the filter medium 21 and provided in the interior of the nozzle 8 so as to face the small space 19b located above the liquid surface. Liquid collecting container 63 and liquid collecting container 63
And a guide tube 64 for guiding the washing liquid 60 containing the suspended substance 11 stored in the non-filtration liquid 12 outside the double cylinder 16.

[0006] In the rotary filtration device with the filter material washing function according to the first aspect, when the supply means 14 supplies the liquid 12 to the liquid tank 13, the liquid level of the liquid 12 in the liquid tank 13 gradually rises. When the liquid level reaches the double cylinder 16, the liquid 12 flows from the liquid-permeable outer cylinder 17 into the filtration space 19, and the suspended substance 11 in the liquid 12 is captured and separated by the filter medium 21, Further, the filtered liquid 12 flows into the liquid-permeable inner cylinder 18. When the liquid level of the liquid 12 supplied to the liquid tank 13 reaches near the axis of the double cylinder 16, the filtered liquid 12 inside the inner cylinder 18 is discharged to the outside of the liquid tank 13 by the drainage means 43. You. On the other hand, the double cylinder 1
6, the filter medium 21 in the small space 19b appearing above the liquid level of the liquid 12 is removed from the cleaning nozzle 54.
The filter medium 21 is cleaned by the cleaning liquid 60 injected from the
The suspended substance 11 released from the reservoir collects together with the washing liquid 60 in the liquid collecting container 63. The cleaning liquid 60 containing the suspended substance 11 stored in the liquid collecting container 63 is guided into the liquid tank 13 outside the double cylinder 16 through the guide tube 64, and the suspended substance 11 in the cleaning liquid 60 is transferred to the liquid tank 13. Deposits on the bottom.

The invention according to claim 2 is the invention according to claim 1, and as shown in FIGS. 1 and 2, the rotating means 43 intermittently moves the double cylinder 16 in small space 19b units. It is configured to be driven to rotate. In the rotary filtration device with a filter material washing function according to claim 2,
The liquid 12 is supplied to the liquid tank 13 and the small space 19 is supplied every predetermined time.
When the double cylinder 16 is rotationally driven in units of b, the suspended substance 11
The small space 19b accommodating the filter medium 21 that has captured the liquid 12 appears sequentially above the liquid level of the liquid 12, so that the liquid tank 13
Without stopping the supply of liquid 12 to the
Can be sequentially washed, and the washing solution 60 can be surely collected by the collecting container 63 together with the suspended substance 11 separated from the filtering material 21.

[0008] The invention according to claim 3 is the invention according to claim 1 or 2, further comprising a suspended substance 11 in which a cleaning liquid 60 is supplied to a liquid tank 13 as shown in FIGS. The liquid 12 or the liquid 12 from which the suspended substance 11 has been removed is characterized. In the rotary filtration device with a filter material cleaning function according to the third aspect, the cleaning liquid 60 is supplied to the liquid tank 13 or the liquid 12 filtered by the filter material 21.
Therefore, it is not necessary to newly prepare the cleaning liquid 60.

The invention according to claim 4 is the invention according to claims 1 to 3
The invention according to any of the above aspects, further characterized in that a liquid collecting container 63 is provided so that an upper end is located above a liquid level in the liquid tank 13 as shown in FIGS. 1 and 2. In the rotary filtration device with a filtration material washing function according to the fourth aspect, the liquid 12 filtered by the filtration material 21 and the filtration material 2
It is possible to prevent the washing liquid 60 containing the suspended substance 11 separated from 1 from being mixed.

[0010] The invention according to claim 5 is the invention according to claims 1 to 4.
The invention according to any of the above, further as shown in FIG.
It is characterized in that a pair of closing plates 37 and 38 for closing the both end surfaces respectively are provided on both end surfaces of the outer cylinder 17. In the rotary filtration device with a filtering material washing function according to the fifth aspect, the liquid 12 filtered by the filtering material 21 and the unfiltered liquid 12 in the liquid tank 13 outside the double cylinder 16 are mixed. Can be prevented.

The invention according to claim 6 is the invention according to claims 1 to 5
The invention according to any of the above, further as shown in FIG.
The liquid 12 containing the suspended substance 11 is geothermal hot water. In the rotary filtration device with a filtration material washing function according to the sixth aspect, the supersaturated silica (suspension substance 11) contained in the geothermal hot water 12 can be efficiently captured and separated by the filtration material 21.

The invention according to claim 7 is the invention according to claims 1 to 6
The invention according to any of the above, further as shown in FIG.
Discharge means 68 is provided at the bottom of the liquid tank 13 for discharging a slurry produced by precipitation of the suspended substance 11. In the rotary filtration device with a filter material washing function according to the seventh aspect, the slurry of the suspended substance 11 settled and deposited at the bottom of the liquid tank 13 does not stop the supply of the liquid 12 to the liquid tank 13. The liquid is discharged from the liquid tank 13 by the discharging means 68.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2,
The rotary filtration device 10 includes a liquid tank 13 in which a liquid 12 containing a suspended substance 11 is stored, a supply unit 14 for supplying the liquid 12 to the liquid tank 13, a liquid-permeable outer cylinder 17, and substantially concentric with the outer cylinder 17. And a filter medium 21 housed in a filtration space 19 surrounded by the outer cylinder 17 and the inner cylinder 18. In this embodiment, the liquid tank 13 has an upper tank portion 13a formed in a square tubular shape, and a lower tank portion 13b formed in a quadrangular pyramid shape and connected to the lower end of the upper tank portion 13a. In this embodiment, the liquid 12 is geothermal hot water, and the suspended substance 11 is supersaturated silica contained in the geothermal hot water 12.

The supply means 14 is, as shown in detail in FIG.
A supply pipe 22 having one end immersed in the geothermal hot water 12 spouted from the ground and the other end inserted into the lower tank portion 13b;
And a supply pump 23 provided at A seed tank 27 and a chemical tank 28 are connected to the supply pipe 22 downstream of the supply pump 23 via a seed supply pipe 24 and a chemical supply pipe 26, respectively. The above-mentioned seed tank 27
One or both of a crystal nucleus growth promoting material for promoting the growth of the crystal grains of the suspended substance 11 and a coagulated sedimentation material for promoting the coagulated precipitation of the crystal grains of the suspended substance 11 are stored. It is preferable that the crystal nucleus growth promoting material is silicon dioxide or a silicate compound having a specific surface area of 1 m ² / g or more. The reason why the silicon dioxide or the silicate compound is added to the geothermal hot water is that they serve as nuclei (seeds) to further promote the crystal nucleus growth of the supersaturated silica as the suspended substance 11.

The coagulated sedimentation material is selected from the group consisting of metal compounds containing aluminum, magnesium, iron, calcium, copper or manganese, and nitrogen-containing cation compounds.
It is preferably a species or a mixture of two or more species. The above-mentioned metal compound and nitrogen-containing cation compound are added because these compounds are dissolved in the geothermal hot water 12 and the supersaturated substance 11 is suspended by polyvalent cations or substances generated secondarily. This is because silica is easily aggregated. Further, the chemical liquid tank 28 stores a pH adjuster such as sulfuric acid (H ₂ SO ₄ ) or caustic soda (NaOH) for adjusting the pH of the geothermal hot water 12. Reference numerals 29 and 31 in FIG. 1 are a seed pump and a flow meter, and reference numerals 32 and 33 are a chemical pump and a flow meter. Reference numerals 34 and 36 denote a pressure gauge and a flow meter for measuring the pressure and flow rate of the geothermal hot water 12 flowing through the supply pipe 22, respectively.

The axis of the outer cylinder 17 and the inner cylinder 18 of the double cylinder 16 is substantially horizontal, and a part of the outer cylinder 17 and the inner cylinder 18 is made to protrude from the liquid surface of the geothermal hot water 12. 12 is provided in the liquid tank 13 so as to be rotatable in the circumferential direction around the axis (FIGS. 1 and 2). More specifically, the inner cylinder 18 is accommodated in the outer cylinder 17 so as to have the same axis, and a pair of closing plates 37 and 38 are attached to both end surfaces of the outer cylinder 17 and the inner cylinder 18 (FIG. 1). First and second rotating shafts 41 and 42 extending along the axis are projected from centers of the pair of closing plates 37 and 38, respectively, and these rotating shafts 41 and 42 are opposed to each other of the upper tank portion 13a. It is rotatably attached to the pair of side walls 13c and 13d (FIGS. 1, 3 and 4). First rotating shaft 41
Is loosely inserted into the first through hole 13e of the one side wall 13c, and is rotatably held via the first bearing 41b by the first bracket 41a attached to the one side wall 13c (FIG. 3). Further, the second rotating shaft 42 is loosely inserted into the second through hole 13f of the other side wall 13d, and is rotatably held by the second bracket 42a attached to the other side wall 13d via the second bearing 42b (FIG. 4).

Although not shown, the inner cylinder 18 and the outer cylinder 17 are preferably formed by superposing two stainless steel nets, one of which has a relatively small wire diameter and an opening of about 1 mm. The other mesh is formed to have a relatively large wire diameter and a relatively large mesh size of about 5 mm to prevent deformation of the one mesh. Further, the filtration space 19 surrounded by the outer cylinder 17, the inner cylinder 18, and the pair of closing plates 37, 38 is divided into a plurality of small spaces 19b by a plurality of partition plates 19a provided radially around the axis (FIG. 2). In this embodiment, the filtering space 19
Is divided into twelve small spaces 19b by twelve partition plates 19a.
, But is not limited to these numbers.

The filtering material 21 is provided in each small space 19 of the filtering space 19.
b, it is formed in a size that can flow and cannot leak from the filtration space 19, for example, the particle size is in the range of 2 to 5 mm, and captures the suspended matter 11 in the geothermal hot water 12 and separates it from the geothermal hot water It has a function to do. The material of the filter material 21 may be a material conventionally used for the filtration treatment, but may be a soil component mainly composed of a hydrous silicate mineral (zeolite group), a natural or artificial silicate mineral (lightweight foamed concrete (AL
C) etc.) Agglomerated and granular materials, granular materials of polymeric materials, 3D network aggregates of polymeric materials, brush-like aggregates of polymeric materials, hollow cylindrical materials of inorganic or organic materials, inorganic It is preferable to use a hollow sphere material of a material or an organic material, and these can be used alone or in a mixed state. In particular, if a light-weight material having a specific gravity of 1 or less is used as the filter medium 21, the filter medium 21 is easily flow-stirred by the self-buoyancy of the filter medium 21 itself, and the handling and transport of the filter medium 21 itself is facilitated. . Further, the filter medium 21 is accommodated so as to have a certain space volume with respect to the volume of the small space 19b. As a result, the filter medium 21 is placed in each small space 1
9b so that they can flow and come into contact with each other.
In addition, if iron hydroxide is mixed with the filter material 21, geothermal hot water 1
2 is accumulated in the filter medium 21 and can be removed from the geothermal hot water 12.

The double cylinder 16 is driven to rotate by a rotation means 43. As shown in detail in FIG. 3, the rotating means 43 includes a cylindrical drive motor 43a mounted on the outer surface of one of the side walls 13c of the upper tank portion 13a, and an output shaft 43b of the motor 43a.
, And a driven gear 43d meshed with the drive gear 43c and fitted to the second rotating shaft 42. As the cylinder driving motor 43a, an electric motor such as a stepping motor or a servomotor, a fluid pressure motor using hydraulic pressure or air pressure, or the like is used. Rotating means 4
Numeral 3 is configured to intermittently drive the double cylinder 16 in small space 19b units. Reference numeral 44 in FIG. 3 denotes a seal member for preventing the geothermal hot water 12 in the liquid tank 13 from leaking.

A drainage means 46 for keeping the level of the geothermal hot water 12 supplied into the liquid tank 13 constant is attached to the outer surface of one side wall 13c of the upper tank 13a (FIGS. 1 and 3). As shown in detail in FIG. 3, the drainage means 46 has one side wall 13c.
A drainage tank 46a mounted on the outer surface;
6a and an overflow pipe 46b inserted into the inside. The first rotating shaft 41 is formed to be hollow, and the tip of the first rotating shaft 41 is inserted into a lower part of the drainage tank 46a. Thereby, the inside of the inner cylinder 18 and the drainage tank 46 a are configured to communicate with each other through the first rotation shaft 41, and the geothermal hot water 1 supplied to the liquid tank 13 and filtered through the filter medium 21 is formed.
2 is discharged from the inside of the inner cylinder 18 to the outside of the liquid tank 13. The upper end of the overflow pipe 46b extends to near the upper end of the drainage tank 46a.
The liquid level of the geothermal hot water 12 in the liquid tank 13 is determined by the position of the upper end of 6b. Reference numeral 53 in FIG. 3 denotes a third bracket that rotatably holds the first rotary shaft 41 via a third bearing 53a and is attached to the drainage tank 46a.
Is a seal member for preventing the geothermal hot water 12 in the drainage tank 46a from leaking.

A washing nozzle 54 is provided above the outer cylinder 17, and the washing nozzle 54 is provided so as to be able to reciprocate along the axial direction of the double cylinder 16 by the nozzle conveying means 56 (FIGS. 1 and 2). ). The nozzle transfer means 56 includes a pair of support members 56a, 56a erected at the upper end of the liquid tank 13, a screw rod 56b rotatably supported by the pair of support members 56a, 56a, and a pair of support members 56a at both ends. , 56
a, and a pair of guide rods 56c, 56c arranged in parallel with the screw rod 56b, and a nozzle holder 56d screwed to the screw rod 56b and slidably fitted in the pair of guide rods 56c, 56c. And a nozzle drive motor 56e that rotationally drives the screw rod 56b. Cleaning nozzle 5
Reference numeral 4 denotes a nozzle main body 54a which is attached to the lower surface of the nozzle holder 56d via the connecting member 55 and which is curved so as to correspond to the outer peripheral surface of the outer cylinder 17, and a plurality of small spaces 19.
b, the small space 1 located above the liquid level of the geothermal hot water 12
9b, and a plurality of injection holes 54b formed toward 9b.

The supply pipe 2 upstream of the supply pump 23
2, one end of a cleaning pipe 57 is branched and connected, and the other end of the cleaning pipe 57 is provided so as to extend to the vicinity of a nozzle drive motor 56e (FIG. 1). The nozzle holder 56d and the connecting member 55 have communicating holes 56f, 55a communicating with the injection holes 56f.
Is formed (FIG. 2), and the other end of the cleaning pipe 57 and the communication hole 56f of the nozzle holder 56d are connected by a flexible hose 58 (FIGS. 1 and 2). Also hose 58
Is held by the hose holding means 59. The hose holding means 59 is a rail 5 provided above the screw rod 56b.
9a and a plurality of hooks 59b slidably fitted to the rail 59a, and the hose 58 is held at a predetermined interval by the hooks 59b. Thereby, the hose 58 is configured to smoothly follow the nozzle holder 56d without coming into contact with the threaded rod 56b or the like. The cleaning liquid 60 injected from the injection holes 54 b is the geothermal hot water 12 before passing through the filtration space 19. Reference numeral 61 in FIG. 1 denotes an opening / closing valve for opening and closing the cleaning pipe 57, and reference numeral 62 denotes a cleaning pump for pumping the cleaning liquid 60 to the cleaning nozzle 54.

A liquid collecting container 63 is provided inside the inner cylinder 18 so as to face the small space 19 b located above the liquid level of the geothermal hot water 12. The geothermal hot water 12 in the liquid tank 13 with a predetermined interval
(FIGS. 1 to 4). One end of the liquid collecting container 63 is fixed to the liquid tank 13 via the first stay 71 and the drain tank 46a (FIG. 3).
The other end is fixed to the liquid tank 13 via the second stay 72 and the second bracket 42a (FIG. 4). The first stay 71 is formed in a substantially L-shape, passes through the inside of the first rotating shaft 41, and is fixed to the inner surface of the drainage tank 46a (FIG. 3). The second stay 72 is formed in an inverted L-shape, passes through the inside of the second rotating shaft 42, and is fixed to the second bracket 42a (FIG. 4). The liquid collecting container 63 is configured to collect the cleaning liquid 60 sprayed from the cleaning nozzle 54 together with the suspended substance 11 separated from the filter medium 21. The second stay 72 also has a function as a guide tube 64 for guiding the cleaning liquid 60 containing the suspended substance 11 stored in the liquid collecting container 63 to the unfiltered geothermal hot water 12 outside the double cylinder 16 (FIG. 4). ). That is, the second stay 72 includes a vertical portion 72a extending in the vertical direction and a vertical portion 7 extending in the horizontal direction.
2b, and a guide hole 72c is formed in the second stay 72 and extends from the upper end of the vertical portion 72a to near the tip of the horizontal portion 72b. Liquid collection container 6 facing the upper end of vertical portion 72a
3, a first through hole 63a is formed at the bottom of the horizontal portion 72b.
A second through-hole 72d is formed in the center of the second rotary shaft 42, and a third through-hole 42c is further formed in the second rotating shaft 42. Reference numeral 66 in FIG.
Represents the filtered geothermal hot water 12 inside the inner cylinder 18 and the double cylinder 1
Reference numeral 67 denotes a seal member for preventing the unfiltered geothermal hot water 12 outside from being mixed, and reference numeral 67 denotes a seal member for preventing the geothermal hot water 12 in the second rotating shaft 42 from leaking.

A discharge means 68 is provided at the bottom of the liquid tank 13 (FIGS. 1 and 2). The discharge means 68 includes a discharge pipe 68a having one end connected to the bottom of the liquid tank 13, and a discharge pipe 68a.
Opening / closing valve 6 provided at the
8b and a slurry discharge pump 68c provided in a discharge pipe 68a downstream of the on-off valve 68b. The slurry discharge pump 68c is configured to discharge the slurry of the suspended substance 11 deposited on the bottom of the liquid tank 13. To the other end of the discharge pipe 68a, a filter press (not shown) for collecting the slurry as a solid and a spray dryer for collecting the slurry as a powder are connected.

The operation of the rotary filter constructed as above will be described. When the supply pump 23 is started, the geothermal hot water 1
2 is supplied to the lower part of the liquid tank 13 through the supply pipe 22.
At this time, when the seed pump 29 is started, the crystal nucleus growth promoting material and the coagulated sedimentation material in the seed tank 27 are mixed with geothermal hot water and supplied to the liquid tank 13, so that the crystal nucleus growth promoting material is nucleated (seed). As a result, the crystal nucleus growth of the supersaturated silica as the suspended substance 11 is promoted, and the supersaturated silica as the suspended substance 11 is aggregated by the coagulating sedimentation material. As a result, the particle size of the supersaturated silica as the suspended substance 11 increases. When the chemical pump 32 is started, the pH adjusting agent in the chemical tank 28 is mixed with the geothermal water 12 to adjust the pH of the geothermal water 12 supplied to the liquid tank 13.

The liquid level of the geothermal hot water 12 in the liquid tank 13 gradually rises, and when the liquid level reaches the double cylinder 16, the geothermal hot water 12 flows from the outer cylinder 17 into the filtration space 19, Filter material 21
Suspended matter 11 in the geothermal hot water 12 when passing through the gap between
Are captured and separated by the filter material 21, and the filtered geothermal hot water 12 flows into the inner cylinder 18. Geothermal hot water 1
Since the particle size of the suspended substance 11 contained in 2 is larger than the gap between the filter media 21, the suspended substance 11 cannot be passed through the gap and is captured by the filter media 21. Further, the minute suspended substance 11 that has passed through the gap collides with the filter medium 21 due to a difference in inertial force based on a difference in mass between the suspended substance 11 and the geothermal hot water 12, and the flow velocity thereof decreases, or It is captured by the surface tension of the geothermal hot water 12 on the surface of the filter medium 21. When the liquid level of the geothermal hot water 12 supplied to the liquid tank 13 reaches the vicinity of the axis of the double cylinder 16, the filtered geothermal hot water 12
When the liquid level of the geothermal hot water 12 supplied to the liquid tank 13 reaches the upper end of the overflow pipe 46b, the filtered geothermal hot water 12 is stored in the drain tank 46a through the first rotary shaft 41. The water is returned to the ground through the overflow pipe 46b and further through an underground reduction well for geothermal power generation.

At this time, since the geothermal hot water 12 passing through the underground reduction well does not contain supersaturated silica as the suspended substance 11, this supersaturated silica does not adhere to the inner wall of the underground reduction well as silica scale. No flow reduction of underground return wells will occur. The discharge amount of the geothermal hot water 11 by the supply pump 23 is determined in the liquid tank 13 and the drain tank 46a.
The liquid level of the geothermal hot water 12 is adjusted so as to substantially coincide with the upper end of the overflow pipe 46b. Drainage tank 4
By examining the filtered geothermal hot water 12 in 6a, the quality of the geothermal hot water 12 returned to the underground reduction well can be checked.

When a predetermined time elapses after the supply pump 23 is started, the cylinder driving motor 43a is started to rotate the double cylinder 16 by a predetermined angle (in units of the small space 19b: 30 degrees in this embodiment). Stop after When the opening and closing valve 61 is opened and the cleaning pump 62 is started after the cylinder driving motor 43a is stopped, the cleaning liquid 60 is discharged from the injection hole 54b of the cleaning nozzle 54 into the small space 19b located above the liquid level of the geothermal hot water 12. Injected toward the filter medium 21, the filter medium 2
The suspended substance 11 captured by 1 is separated from the filter medium 21 and accumulates together with the cleaning liquid 60 in the liquid collecting container 63. Here, when the nozzle drive motor 43a is started, the cleaning nozzle 54 reciprocates with the nozzle holder 56d over the entire length of the small space 19b.
Everything can be washed. The cleaning liquid 60 containing the suspended substance 11 stored in the liquid collecting container 63 is supplied to the first through hole 63a of the liquid collecting container 63, the guide hole 72c of the second stay 72, and the second stay 7.
The second through hole 72d of the second rotary shaft 42 and the third through hole 42 of the second rotary shaft 42
The liquid 11 is guided into the liquid tank 13 outside the double cylinder 16 through c, and the suspended substance 11 in the cleaning liquid 60 is deposited on the bottom of the liquid tank 13.

When a predetermined time elapses after stopping the cylinder driving motor 43a, the motor 43a is started again to rotate the double cylinder 16 intermittently in small space 19b units. The filter medium 21 in the small space 19b located above the level of the water 12 is washed. Further, the slurry of the suspended substance 11 precipitated and deposited on the bottom of the liquid tank 13 is supplied to the liquid tank 13.
Without stopping the supply of the geothermal hot water 12 to the tank, the gas is discharged from the liquid tank 13 by opening the on-off valve 68b and the slurry discharge pump 68c, and is guided to a filter press, a spray dryer, or the like. By repeating the above operation, it is possible to sequentially wash the filter medium 21 capturing the suspended substances 11 without stopping the supply of the geothermal hot water 12 to the liquid tank 13. As a result, the suspended substance 11 contained in the geothermal hot water 12 can be efficiently captured by the filter medium 21 without reducing the ability of the filter medium 21 to capture the suspended substance 11. The above operations are performed by the controller using the supply pump 23, the cylinder drive motor 43a, the nozzle drive motor 56a.
e, It is preferable that the cleaning is automatically performed by controlling the cleaning pump 62 and the like.

FIG. 5 shows a second embodiment of the present invention.
5, the same reference numerals as those in FIG. 2 indicate the same parts. In this embodiment, a cleaning nozzle 94 is provided inside the inner cylinder 18 and a small space 19 located above the liquid level of the geothermal hot water 12.
It is configured to inject the cleaning liquid 60 to the filter medium 21 in b. The cleaning nozzle 94 is located in the liquid collecting container 63 and is formed on the upper surface of the nozzle body 94a, which is formed slightly smaller than the width of the small space 19b and slightly shorter than the entire length of the liquid collecting container 63. It has a large number of injection holes 94b. The nozzle body 94a is fixed to the liquid collecting container 63, and the injection hole 94b is connected to the washing pipe by a hose (not shown). Except for the above, the configuration is the same as that of the first embodiment. In the rotary filter configured as described above,
With the cleaning liquid 60 sprayed so as to blow up from the injection holes 94b of the cleaning nozzle 94, the suspended substance trapped by the filter medium 21 is separated from the filter medium 21, and the cleaning liquid 60 containing the suspended substance is removed.
The operation is the first except that is stored in the collection container 63.
Since the third embodiment is almost the same as the first embodiment, the description thereof will not be repeated.

In the first and second embodiments, geothermal hot water is used as the liquid. However, if the liquid contains a suspended substance such as an organic substance or an inorganic substance, water from a lake or marsh, water from a river,
Sewage, muddy water, etc. may be used. Further, in the first and second embodiments, the liquid containing the suspended substance supplied to the liquid tank is used as the cleaning liquid sprayed from the cleaning nozzle, but the geothermal hot water after passing through the filtration space 19 is used. That is, geothermal hot water from which suspended matter has been removed by filtration with a filter material may be used,
Further, river water or other liquids may be used.

[0032]

As described above, the suspended substance contained in the liquid is contained in the filtration space surrounded by the liquid-permeable outer cylinder and the liquid-permeable inner cylinder which are rotatable about the axis. The filter medium to be captured is accommodated, and a plurality of partition plates radially provided around the axis divide the filtration space into a plurality of small spaces, and the washing nozzle provided above the outer cylinder or inside the inner cylinder is above the liquid surface. The cleaning liquid is sprayed onto the filter medium in the small space located at the position to separate suspended substances from the filter medium, and the liquid collecting container located inside the inner cylinder and fixed to the liquid tank discharges the cleaning liquid sprayed from the cleaning nozzle. The liquid is collected together with the suspended substance, and further the washing liquid containing the suspended substance stored in the liquid collecting container is configured to be guided to the unfiltered liquid outside the double cylinder by the guide tube, and is supplied to the liquid tank by the supply means. The liquid that has flowed into the filtration space from the liquid-permeable outer cylinder, Separated are more captured and further discharged filtered fluid then flows into the liquid permeability inner cylinder, the outside of the liquid tank by drainage means. On the other hand, since the double cylinder is rotated by the rotating means, the filtering material in the small space that appears above the liquid level of the liquid is washed by the washing liquid ejected from the washing nozzle, and the suspended matter captured by the filtering material is After being separated from the filter material, it collects in the liquid collecting container together with the washing liquid, is guided to the liquid tank outside the double cylinder through the guide tube, and the suspended solids in the washing liquid precipitate and deposit on the bottom of the liquid tank to form a slurry. Becomes As a result, it is possible to wash the filter medium that has captured the suspended substance without stopping the supply of the liquid to the liquid tank, and to reduce the ability of the filter medium to capture the suspended substance without decreasing the ability to capture the suspended substance. Suspended substances can be efficiently captured by the filter material.

Further, if the rotating means is configured to intermittently drive the double cylinder in small space units, the small spaces containing the filter medium capturing the suspended matter are sequentially raised above the liquid level. Therefore, the filter medium capturing the suspended substance can be sequentially washed without stopping the supply of the liquid to the liquid tank, and the washing liquid is surely removed by the collecting container together with the suspended substance separated from the filter medium. Can be collected. Further, if the cleaning liquid is a liquid containing a suspended substance to be supplied to the liquid tank or a liquid from which the suspended substance has been removed, the cleaning liquid is the same as the liquid supplied to the liquid tank or the liquid filtered by the filter material. ,
There is no need to prepare a new cleaning solution. In addition, if the upper end of the liquid collecting container is provided above the liquid level in the liquid tank, the liquid filtered by the filter medium and the washing liquid containing suspended substances separated from the filter medium are prevented from being mixed. it can.

Further, if a pair of closing plates for closing the both end surfaces are provided on both end surfaces of the outer cylinder, the liquid filtered by the filtering material and the unfiltered liquid in the liquid tank outside the double cylinder are provided. Can be prevented from being mixed. If the liquid containing the suspended substance is geothermal hot water, supersaturated silica (suspended substance) contained in the geothermal hot water can be efficiently captured and separated by the filter material. Further, if a discharging means is provided at the bottom of the liquid tank for discharging the slurry generated by the precipitation of the suspended substance, the slurry of the suspended substance deposited and deposited at the bottom of the liquid tank can be used to transfer the slurry to the liquid tank. The liquid can be discharged from the liquid tank by the discharging means without stopping the supply.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view taken along the line AA of FIG. 2, showing a rotary filtration device with a filter material washing function according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is an enlarged sectional view of a portion C in FIG. 1;

FIG. 4 is an enlarged sectional view of a portion D in FIG. 1;

FIG. 5 is a sectional view of a main part including an upper portion of a double cylinder, a washing nozzle, and a liquid collecting container according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Rotary filtration device 11 Suspended substance 12 Geothermal hot water (liquid) 13 Liquid tank 14 Supply means 16 Double cylinder 17 Liquid-permeable outer cylinder 18 Liquid-permeable inner cylinder 19 Filtration space 19a Partition plate 19b Small space 21 Filter material 37, 38 Closing plate 43 Rotating means 46 Drainage means 54, 94 Cleaning nozzle 60 Cleaning liquid 63 Liquid collecting container 64 Guide tube 68 Discharge means

Continued on the front page (72) Inventor Koichi Kato 1-297 Kitabukuro-cho, Omiya-shi, Saitama F-term in Mitsubishi Materials Corporation Research Laboratory 4D026 BA01 BB01 BC22 BC24 BC29 BD03

Claims (7)

[Claims] 1. A liquid tank (13) for storing a liquid (12) containing a suspended substance (11), and a supply means (14) for supplying the liquid (12) to the liquid tank (13).
And a liquid-permeable outer cylinder (17) and a liquid-permeable inner cylinder (1
8) having an axis in a substantially horizontal direction and projecting a part of the outer cylinder (17) and the inner cylinder (18) from the liquid surface of the liquid (12) to move the axis in the liquid (12). A double cylindrical body (16) provided in the liquid tank (13) so as to be rotatable in the circumferential direction around the center, and a filtration space (1) surrounded by the outer cylinder (17) and the inner cylinder (18).
9) a filter medium (21) housed so as to be able to flow and not leak from the filtration space (19) and trapping the suspended substance (11) to separate it from the liquid (12); Rotating means (43) for rotating and driving the 16), and the liquid tank (13) while keeping the liquid level in the liquid tank (13) constant.
Liquid (12) supplied to the inner cylinder
Drainage means for discharging from the inside of (18) to the outside of the liquid tank (13)
(46), and a plurality of partition plates (19a) radially provided around the axis and dividing the filtration space (19) into a plurality of small spaces (19b), Filtering material (21) in a small space (19b) provided above the outer cylinder (17) or inside the inner cylinder (18) and located above the liquid level
The washing nozzle (5) which injects the washing liquid (60) into the filter medium (21) to separate the suspended substance (11) captured by the filter medium (21) from the filter medium (21).
4); and a small space located above the liquid level inside the inner cylinder (18).
The cleaning liquid (60) provided opposite to (19b) and fixed to the liquid tank (13) and jetted from the cleaning nozzle (54) together with the suspended substance (11) separated from the filter medium (21). A liquid collecting container (63) for collecting liquid, and a washing liquid (60) containing the suspended substance (11) stored in the liquid collecting container (63) is supplied with an unfiltered liquid (12) outside the double cylinder (16). ), And a guide pipe (64) leading to the filter material washing function. 2. The rotating means (43) moves the double cylinder (16) into a small space (1).
The rotary filtration device with a filter material washing function according to claim 1, wherein the rotary filtration device is configured to intermittently drive in units of 9b). 3. The cleaning liquid (60) is a liquid (12) containing a suspended substance (11) supplied to a liquid tank (13) or a liquid (12) from which the suspended substance (11) has been removed. Item 3. A rotary filtration device with a filter material washing function according to item 1 or 2. 4. A liquid collecting container (63) having an upper end located above a liquid level in the liquid tank (13).
The rotary filtration device with a filter material washing function according to any one of the above. 5. A pair of closing plates (37, 38) for closing both end surfaces of the outer cylinder (17), respectively.
5. The rotary filtration device with a filter material washing function according to any one of items 4 to 4. 6. The rotary filtration device with a filter material washing function according to claim 1, wherein the liquid (12) containing the suspended substance (11) is geothermal hot water. 7. A discharge means (68) for discharging a slurry produced by precipitation of a suspended substance (11) at the bottom of a liquid tank (13). Rotary filtration device with filter material washing function.