JP2009160585A - Ion exchange apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion exchange apparatus capable of distributing regeneration liquid using only one ejector, controlling the amount of raw water flow within a prescribed range, and equally distributing the regeneration liquid. <P>SOLUTION: A group of flow channel control valves 3 comprise a first constant flow valve 25, an ejector 26 to which a brine water supply line 31 is connected on the discharging side of the nozzle, a first orifice 28, all three provided on a first regeneration line 23 connected to a raw water supply line 16 in this order from the raw water supply line 16 side, and further comprise a second orifice provided on a second regeneration line 29 connected to the first regeneration line 23 between the ejector 26 and the first orifice 28. With such a structure, a water passing operation and a regeneration operation are carried out. In the former operation, the raw water is supplied to a resin container 2 from above and collected at its bottom. In the latter, a part of the regeneration liquid from the ejector 26 is supplied to the resin container 2 at its bottom via the first regeneration line 23, while the rest of the regeneration liquid from the ejector 26 is supplied thereto from above via the second regeneration line 29, and both regeneration liquid flows are collected at about the middle of the height of the packed resin 5 layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an ion exchange apparatus that performs shunt regeneration on an ion exchange resin.

  There is known an ion exchange device that adsorbs and removes hardness components (calcium ions and magnesium ions), nitrate nitrogen (nitrate ions and nitrite ions), etc. contained in raw water such as tap water and groundwater by an ion exchange resin. Among these ion exchange devices, those that use cation exchange resin to replace the hardness in water with sodium ions or potassium ions are usually called soft water devices. On the other hand, among the ion exchange devices, those that use anion exchange resin to replace nitrate nitrogen with chloride ions are usually called nitrate nitrogen removal devices.

  In the ion exchange apparatus, an ion exchange apparatus that performs shunt regeneration on an ion exchange resin is known from Patent Document 1.

JP-A-1-307457

  In particular, in an ion exchange apparatus that performs split flow regeneration using raw water, the distribution of the first regenerated liquid from the bottom of the resin container and the distribution of the second regenerated liquid from the top of the resin container are performed as one ejector. It is an object of the present invention to provide an ion exchange device that can adjust the flow rate of raw water to a predetermined range and can distribute the distribution of the first regeneration solution and the distribution of the second regeneration solution equally.

  This invention was made in order to solve the above-mentioned subject, and the invention according to claim 1 includes a resin container filled with an ion exchange resin, a flow path control valve for switching between a water flow operation and a regeneration operation, A salt water tank for storing salt water used for regeneration; and a controller that controls the flow path control valve to switch between a flow path for water flow operation and a flow path for regeneration operation. The ion exchange apparatus is connected to a salt water supply line, wherein the flow path control valve is a constant flow valve provided in order from the raw water line side to the first regeneration line connected to the raw water line, on the discharge side of the nozzle part A second orifice provided in an ejector and a first orifice to which the salt water supply line is connected, and a second regeneration line connected to the first regeneration line between the ejector and the first orifice. And the controller controls the flow path control valve to distribute the raw water from the upper part of the resin container and soften the water in the process of flowing down the packed bed of the ion exchange resin, Filling the ion exchange resin by collecting the water through the bottom of the resin container and distributing a part of the regenerated liquid from the ejector from the bottom of the resin container through the first regeneration line. Passing through the bed in an upward flow to regenerate the lower layer portion of the ion exchange resin, and the remaining portion of the regenerated liquid from the ejector is distributed from the upper portion of the resin containing portion through the second regeneration line, and the ion exchange resin And passing through the packed bed in a downward flow to regenerate the upper layer part of the ion exchange resin and performing the regeneration operation for collecting water near the center of the packed bed height of the ion exchange resin. Yes.

According to the present invention, in an ion exchange device that performs split flow regeneration using raw water, the distribution of the first regenerated liquid from the bottom of the resin container and the distribution of the second regenerated liquid from the top of the resin container are performed as one ejector. The ion exchange apparatus can be provided in which the flow rate of the raw water can be adjusted within a predetermined range and the distribution of the first regeneration solution and the distribution of the second regeneration solution can be evenly distributed.

1 is an overall configuration diagram of an ion exchange device according to a first embodiment. Explanatory drawing which shows the water flow operation | movement of the ion exchange apparatus which concerns on 1st embodiment. Explanatory drawing which shows the backwashing process of the ion exchange apparatus which concerns on 1st embodiment. Explanatory drawing which shows the reproduction | regeneration process of the ion exchange apparatus which concerns on 1st embodiment. Explanatory drawing which shows the extrusion process of the ion exchange apparatus which concerns on 1st embodiment. Explanatory drawing which shows the washing | cleaning process of the ion exchange apparatus which concerns on 1st embodiment. Explanatory drawing which shows the water replenishment process of the ion exchange apparatus which concerns on 1st embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an overall configuration diagram of an ion exchange apparatus according to the first embodiment. The ion exchange device according to the first embodiment is a so-called soft water device that generates soft water by replacing the hardness contained in raw water such as tap water, ground water, and industrial water with sodium ions. It is used for the purpose of supplying water to the demand point as irrigation water. For this reason, the water softener is connected to water supply sources such as residential buildings such as houses and condominiums, customer collection facilities such as hotels and public baths, refrigeration equipment such as boilers and cooling towers, and water use equipment such as food processing equipment and cleaning equipment Is done.

  In FIG. 1, the ion exchange device 1 mainly includes a resin container 2, a flow path control valve 3, and a salt water supply device 4. The resin container 2 includes a bottomed resin cylinder 6 filled with a cation exchange resin 5 as a treatment material, and an opening of the resin cylinder 6 is closed with a lid member 7. The lid member 7 is integrally mounted with the flow path control valve 3 (not shown), and a controller (not shown) controls the flow path of the ion exchange device 1 and the flow path of the regeneration operation. It can be switched by a command signal from (omitted).

  The lid member 7 is formed with a first flow path 8, a second flow path 9 and a third flow path 10 for supplying and discharging fluid. Each of these flow paths 8, 9, 10 is connected to various lines constituting the flow path control valve 3, as will be described later.

  In the resin housing part 2, a first water collecting pipe 11 extending to the vicinity of the bottom part of the resin cylinder 6 is connected to the first flow path 8. A first screen member 12 that prevents the cation exchange resin 5 from flowing out is attached to the tip of the first water collecting pipe 11. That is, the inside of the first water collecting pipe 11 communicates with the first flow path 8, and the water collecting position by the first screen member 12 is set near the bottom of the resin cylinder 6.

  Further, in the resin housing part 2, a second water collecting pipe 13 extending to the vicinity of the center part of the packed bed height of the ion exchange resin 5 is connected to the second flow path 9. A second screen member 14 for preventing the cation exchange resin 5 from flowing out is attached to the tip of the second water collecting pipe 13. That is, the inside of the second water collection pipe 13 communicates with the second flow path 9, and the water collection position by the second screen member 14 is near the center of the packed bed height of the cation exchange resin 5. Is set.

Here, the inner diameter of the second water collecting pipe 13 is set to be larger than the outer diameter of the first water collecting pipe 11, and the axial centers of both the water collecting pipes 11 and 13 are both the resin housing portion 2. It is set on the same axis as the axis. That is, the two water collecting pipes 11 and 13 are the resin pipes as a double pipe structure water collecting apparatus in which the first water collecting pipe 11 is set as an inner pipe and the second water collecting pipe 13 is set as an outer pipe. It is attached to the housing part 2.

  Further, a third screen member 15 for preventing the cation exchange resin 5 from flowing out is mounted on the lower surface side of the lid member 7 in the resin housing portion 2. That is, the third flow path 10 is communicated with the inside of the resin housing portion 2 through the third screen member 15.

  The raw water line 16 is connected to the third flow path 10 via the flow path control valve 3. Further, a treated water line 17 is connected to the first flow path 8 via the flow path control valve 3. That is, a part of the raw water line 16 and the treated water line 17 are respectively formed in the flow path control valve 3.

The raw water line 16 is provided with a pressure switch 18 and a first on-off valve 19 in order from the upstream side. Here, the pressure switch 18 is provided in order to detect the presence or absence of raw water pressure in a regeneration operation to be described later. For example, the pressure switch 18 is turned on and off at a pressure of about 0.1 MPa necessary for normally performing the regeneration operation. It is the type to do. On the other hand, the treated water line 17 is provided with a second on-off valve 20. The pressure switch 18, the first on-off valve 19, and the second on-off valve 20 constitute the flow path control valve 3, respectively.

  Here, the configuration of the flow path control valve 3 will be described in more detail. In the flow path control valve 3, the raw water line 16 on the upstream side of the first on-off valve 19 is connected to the treated water line 17 on the downstream side of the second on-off valve 20 by a bypass line 21. The bypass line 21 is provided with a third on-off valve 22.

  The raw water line 16 upstream of the first on-off valve 19 is connected to the treated water line 17 upstream of the second on-off valve 20 by a first regeneration line 23. In the first regeneration line 23, a strainer 24, a first constant flow valve 25, an ejector 26, a fourth on-off valve 27, and a first orifice 28 are provided in this order from the raw water line 16 side. Here, the strainer 24 is for removing suspended substances contained in the raw water and preventing the first constant flow valve 25 and the ejector 26 from being clogged. The first constant flow valve 25 is for adjusting the raw water supplied to the ejector 26 to a flow rate within a predetermined range.

  The first regeneration line 23 between the ejector 26 and the fourth on-off valve 27 is connected to the raw water line 16 and the second regeneration line 29 on the downstream side of the first on-off valve 19. The second regeneration line 29 is provided with a second orifice 30. Here, the first orifice 28 and the second orifice 30 are used to evenly distribute the regenerated liquid or raw water to the first flow path 8 and the third flow path 10 in the regeneration process and the extrusion process described later. belongs to.

  A salt water supply line 31 extending from the salt water supply device 4 is connected to the ejector 26 on the discharge side of the nozzle portion (reference number omitted), and a fifth on-off valve 32 is connected to the salt water supply line 31. Is provided. That is, the ejector 26 is configured to be able to suck salt water (for example, a saturated aqueous solution of sodium chloride) from the salt water supply device 4 using negative pressure generated when raw water is discharged from the nozzle portion. Yes. In the ejector 26, the salt water from the salt water supply device 4 is diluted with raw water to a predetermined concentration (for example, 8 to 12% by weight).

A first drain line 33 extending to the outside of the flow path control valve 3 is connected to the treated water line 17 upstream of the second opening / closing valve 20. The first drainage line 33 is provided with a sixth on-off valve 34 and a second constant flow valve 35 in order from the treated water line 17 side. The second regeneration line 29 on the downstream side of the second orifice 30 is connected to the first drain line 33 and the second drain line 36 on the downstream side of the sixth on-off valve 34. The second drain line 36 is provided with a seventh open / close valve 37. Further, the second flow path 9 is connected to the first drain line 33 and the third drain line 38 on the downstream side of the sixth on-off valve 34. The third drain line 38 is provided with an eighth on-off valve 39. Here, the second constant flow valve 35 is for adjusting the amount of drainage from the resin container 2 to a predetermined range of flow rate.

  In the flow path control valve 3, each of the on-off valves 19, 20, 22, 27, 32, 34, 37, 39 can employ various operating mechanisms and valve structures. Specifically, a lift type or diaphragm type channel opening / closing valve operated by a cam mechanism, a slide piston type channel opening / closing valve operated by a link mechanism, and the like are particularly suitable.

  Next, the configuration of the salt water supply device 4 will be described in detail. The salt water supply device 4 includes a salt water tank 40. In the salt water tank 40, a cylindrical salt water well 41, a salt water storage section, and a regenerated salt 42 (for example, granular or pellet sodium chloride). And a water-permeable salt water plate 43 that divides the storage section. Here, a communication hole 44 is provided in a lower side wall of the salt water well 41 so that salt water or makeup water can freely flow therethrough.

  A salt water strainer 45 is accommodated in the salt water well 41. The salt water strainer 45 incorporates an air check ball 46 and a valve seat portion 47 against which the air check ball 46 abuts or separates. The valve seat portion 47 is connected to the salt water supply line 31. ing. That is, the flow path control valve 3 is connected to the salt water tank 40 and the salt water supply line 31.

  The salt water supply line 31 is provided with a flow rate detecting means 48 for detecting the flow rate in the salt water supply direction and the flow rate in the makeup water supply direction. The detection signal from the flow rate detection means 48 is input to the control unit. The flow rate detection means 48 is a flow rate sensor configured to be able to detect a bidirectional instantaneous flow rate and an integrated flow rate. For example, a tangential flow rate sensor or an axial flow rate flow sensor can be preferably used. The flow rate detecting means 48 may use two flow rate sensors configured to detect an instantaneous flow rate and an integrated flow rate in a single direction. In this case, the tangential flow rate sensor and the axial flow rate flow rate are used. In addition to the sensor, a Karman vortex flow sensor, an electromagnetic flow sensor, or the like can be used.

  Hereinafter, the water flow operation and the regeneration operation of the ion exchange device 1 according to the first embodiment will be described in detail with reference to FIGS.

  In the water flow operation, as shown in FIG. 2, the first on-off valve 19 and the second on-off valve 20 are each set to an open state by a command signal from the controller (not shown). On the other hand, the third on-off valve 22, the fourth on-off valve 27, the fifth on-off valve 32, the sixth on-off valve 34, the seventh on-off valve 37, and the eighth on-off valve 39 are set in a closed state. Is done. Raw water such as tap water, groundwater, and industrial water flowing through the raw water line 16 is supplied through the third flow path 10 and then distributed from the third screen member 15 in the upper part of the resin container 2. .

The raw water distributed from the third screen member 15 is softened by being replaced with sodium ions in the course of flowing down the packed bed of the cation exchange resin 5 with sodium ions. The soft water that has passed through the packed bed of the cation exchange resin 5 is collected on the first screen member 12 at the bottom of the resin container 2, and then the first water collecting pipe 11, the first flow path 8, and the It distributes via the treated water line 17 and is supplied to the demand point. When the cation exchange resin 5 cannot replace the hardness by collecting a predetermined amount of soft water, the regeneration operation is performed.

  In the regeneration operation, in order to recover the hardness removal capability of the cation exchange resin 5, a back washing process, a regeneration process, an extrusion process, a washing process, and a water replenishing process are performed in this order. Incidentally, the regeneration operation is normally set to be performed at midnight without using soft water. However, at a demand point that requires soft water at night, a plurality of the ion exchange devices 1 are connected in parallel or in series. Install and set the water flow operation alternately.

  In the backwashing step, as shown in FIG. 3, the second on-off valve 20, the third on-off valve 22, and the seventh on-off valve 37 are set in an open state by a command signal from the controller. The On the other hand, the first on-off valve 19, the fourth on-off valve 27, the fifth on-off valve 32, the sixth on-off valve 34, and the eighth on-off valve 39 are set in a closed state. The raw water flowing through the raw water line 16 is supplied via the bypass line 21, the treated water line 17, the first flow path 8, and the first water collecting pipe 11, and then the bottom of the resin container 2 is Water is distributed from one screen member 12.

  The raw water distributed from the first screen member 12 flowed in an upward flow through the resin container 2, and was generated by suspended suspended matter or crushing while developing the packed bed of the cation exchange resin 5. Wash out fine resin. The raw water that has passed through the packed bed of the cation exchange resin 5 is collected on the third screen member 15 at the upper part of the resin container 2, and then the third flow path 10, the raw water line 16, It is discharged out of the system from the first drainage line 33 via the second regeneration line 29 and the second drainage line 36. After the backwashing process is started, when the accumulated time in the state where the pressure switch 18 is on, that is, with the raw water pressure reaches a predetermined time and a predetermined amount of backwashing is secured, the process proceeds to the regeneration process.

  In the regeneration step, as shown in FIG. 4, the third on-off valve 22, the fourth on-off valve 27, the fifth on-off valve 32, and the eighth on-off valve 39 are in response to a command signal from the controller. Each is set to the open state. On the other hand, the first on-off valve 19, the second on-off valve 20, the sixth on-off valve 34, and the seventh on-off valve 37 are set in a closed state. The raw water flowing through the raw water line 16 is supplied as dilution water to the primary side of the ejector 26 via the first regeneration line 23. At this time, suspended substances in the raw water are removed by the strainer 24, and the flow rate of the raw water is adjusted to a predetermined range by the first constant flow valve 25.

  In the ejector 26, when a negative pressure is generated on the discharge side of the nozzle portion (reference number omitted) due to the passage of raw water, the salt water supply line 31 also has a negative pressure. As a result, the salt water in the salt water tank 40 is sucked into the ejector 26 through the regenerant supply line 31. In the ejector 26, salt water is diluted with raw water to a predetermined concentration to prepare a regenerating solution.

  Part of the regenerated liquid from the ejector 26 is supplied through the first regeneration line 23, the treated water line 17, the first flow path 8, and the first water collecting pipe 11, and then the resin container 2. Water is distributed from the first screen member 12 at the bottom. On the other hand, the remaining portion of the regenerated liquid from the ejector 26 is supplied via the second regeneration line 29, the raw water line 16, and the third flow path 10, and then the third portion is formed above the resin container 2. Water is distributed from the screen member 15. At this time, the regenerated liquid from the ejector 26 is evenly distributed by the first orifice 28 and the second orifice 30.

The regenerated liquid distributed from the first screen member 12 passes through the packed bed of the cation exchange resin 5 in an upward flow, and regenerates the lower layer portion of the cation exchange resin 5. On the other hand, the regenerated liquid distributed from the third screen member 15 passes through the packed bed of the cation exchange resin 5 in a downward flow and regenerates the upper layer portion of the cation exchange resin 5. That is, in the first embodiment, split-flow regeneration is performed on the packed bed of the cation exchange resin 5. At this time, the regenerative liquid in the downward flow presses the packed bed of the cation exchange resin 5 downward to suppress the development and flow of the cation exchange resin 5 by the regenerative liquid in the upward flow. The regenerated liquid that has passed through the packed bed of the cation exchange resin 5 is collected in the second screen member 14 in the vicinity of the center of the packed bed height of the cation exchange resin 5, and then is The water is discharged out of the system from the first drainage line 33 through the water collecting pipe 13, the second flow path 9 and the third drainage line 38.

  In the salt water tank 40, salt water is consumed as the regeneration process proceeds, and the water level falls with time. On the other hand, in the salt water strainer 45, the air check ball 46 descends as the water level falls. When the salt water is consumed up to the position of the valve seat portion 47, the air check ball 46 comes into contact with the valve seat portion 47 to block out the salt water outflow and air suction (see FIG. 5).

During the regeneration step, the flow rate detecting means 48 detects the instantaneous flow rate in the salt water supply direction, that is, the instantaneous flow rate of salt water flowing from the salt water tank 40 to the ejector 26 via the salt water supply line 31. When the detected value exceeds zero and is less than the predetermined flow rate, a regeneration abnormality is notified. Here, the predetermined flow rate is set based on the instantaneous flow rate of salt water flowing through the salt water supply line 31 when the raw water pressure is 0.1 MPa, for example, which is necessary for normally performing the regeneration step.

  In the ion exchange apparatus 1, when a salt water supply system, for example, the ejector 26 or the salt water strainer 45 is clogged, a predetermined amount of salt water is not consumed in the regeneration process, and the quality of treated water is deteriorated due to regeneration failure. cause. For this reason, in the first embodiment, by notifying regeneration abnormality based on the instantaneous flow rate in the salt water supply direction, early maintenance is promoted, and the reliability of the regeneration operation is enhanced. In this case, notification of regeneration abnormality is performed by, for example, a buzzer, a liquid crystal display, or a lamp connected to the controller, and requests the user to contact the maintenance site. Further, the notification of regeneration abnormality may be performed directly from the controller to the maintenance site using a communication line, for example.

  Moreover, at the time of the regeneration process, when the detected value of the instantaneous flow rate becomes zero, the regeneration process is finished and the process proceeds to the extrusion process. As described above, when a predetermined amount of salt water is consumed and the air check ball 46 comes into contact with the valve seat 47, the outflow of salt water is blocked. Then, since the instantaneous flow rate of the salt water flowing through the salt water supply line 31 is also zero, it is possible to detect the transition time to the extrusion process.

  Here, the conventional ion exchange apparatus has controlled the said reproduction | regeneration process and the said extrusion process only by both total time. In this case, for example, when the raw water pressure to the ejector 26 is lowered, it takes time to consume the salt water, and the amount of extrusion is reduced by reducing the time of the extrusion process. And the deterioration of the quality of treated water is caused by poor extrusion. For this reason, in the first embodiment, a predetermined amount of extrusion is secured from the start of the extrusion process by detecting the transition time to the extrusion process based on the instantaneous flow rate in the salt water supply direction, and the regeneration operation To improve the reliability.

Further, during the regeneration process, the flow rate detecting means 48 detects the integrated flow rate in the salt water supply direction, that is, the integrated flow rate until the detected value of the instantaneous flow rate becomes zero from the start point of the regeneration step. When the detected value does not increase by a predetermined amount or more than the detected value at the previous water replenishment step, that is, the amount of makeup water supplied to the salt water tank 40, the lack of the regenerated salt 42 is notified. The detection of the integrated flow rate in the water replenishment step will be described later.

  In the replenishing step, when a certain amount of make-up water is supplied, and when sodium chloride as the regenerated salt 42 is dissolved in the make-up water to generate saturated salt water, the saturated salt water capacity at this time is determined by the supply amount of make-up water. In contrast, it increases by 12 to 13%. This increase rate is almost constant regardless of the temperature. On the other hand, when the regenerated salt 42 disappears and saturated salt water cannot be generated, the increase rate is less than 12%. Therefore, for example, when it is set to supply 10 liters of make-up water each time during the replenishing step, the reclaimed salt 42 is insufficient when the salt water consumption during the regeneration step is less than 11.2 liters. Can be determined.

  In the ion exchange apparatus 1, when the regenerated salt 42 is insufficient, the quality of treated water is deteriorated due to regeneration failure. Therefore, in the first embodiment, early replenishment is performed by notifying the shortage of the regenerated salt 42 based on the integrated flow rate in the salt water supply direction and the integrated flow rate in the makeup water supply direction at the previous water replenishment step. To improve the reliability of the regeneration operation. Here, the user is notified of the shortage of the regenerated salt 42 by, for example, a buzzer, a liquid crystal display, or a lamp connected to the controller.

  In the extruding step, as shown in FIG. 5, the third on-off valve 22, the fourth on-off valve 27, and the eighth on-off valve 39 are each set to an open state by a command signal from the controller. . On the other hand, the first on-off valve 19, the second on-off valve 20, the fifth on-off valve 32, the sixth on-off valve 34, and the seventh on-off valve 37 are set in a closed state. The raw water flowing through the raw water line 16 is supplied to the primary side of the ejector 26 through the first regeneration line 23 as extruded water. At this time, suspended substances in the raw water are removed by the strainer 24, and the flow rate of the raw water is adjusted to a predetermined range by the first constant flow valve 25. The supply of salt water to the ejector 26 is stopped.

  Part of the raw water from the ejector 26 is supplied through the first regeneration line 23, the treated water line 17, the first flow path 8, and the first water collecting pipe 11, and then the resin containing portion 2. Water is distributed from the first screen member 12 at the bottom. Meanwhile, the remaining raw water from the ejector 26 is supplied through the second regeneration line 29, the raw water line 16, and the third flow path 10, and then the upper portion of the resin storage unit 2 is used for the third screen. Water is distributed from the member 15. At this time, the raw water from the ejector 26 is evenly distributed by the first orifice 28 and the second orifice 30.

  The raw water distributed from the first screen member 12 passes through the packed bed of the cation exchange resin 5 in an upward flow while pushing out the regenerated liquid, and subsequently regenerates the lower layer portion of the cation exchange resin 5. On the other hand, the raw water distributed from the third screen member 15 passes through the packed bed of the cation exchange resin 5 in a downward flow while pushing out the regenerated liquid, and continuously regenerates the upper layer portion of the cation exchange resin 5. At this time, the downward flow of raw water presses the packed bed of the cation exchange resin 5 downward, and suppresses the development and flow of the cation exchange resin 5 by the upward flow of raw water. The regenerated liquid and raw water that have passed through the packed bed of the cation exchange resin 5 are collected in the second screen member 14 near the center of the packed bed height of the cation exchange resin 5, and then the It is discharged out of the system from the first drainage line 33 through the second water collecting pipe 13, the second flow path 9 and the third drainage line 38. After the extrusion process is started, when the integrated time when the pressure switch 18 is on, that is, with the raw water pressure reaches a predetermined time, and a predetermined amount of extrusion is secured, the process proceeds to the cleaning process.

In the cleaning step, as shown in FIG. 6, the first on-off valve 19, the third on-off valve 22, and the sixth on-off valve 34 are set in an open state by a command signal from the controller. . On the other hand, the second on-off valve 20, the fourth on-off valve 27, the fifth on-off valve 32, the seventh on-off valve 37, and the eighth on-off valve 39 are set in a closed state. The raw water flowing through the raw water line 16 is supplied as cleaning water through the third flow path 10, and then distributed from the third screen member 15 in the upper part of the resin container 2.

  The raw water distributed from the third screen member 15 passes through the packed bed of the cation exchange resin 5 in a downward flow while washing away the regenerated liquid remaining in the resin container 2. The raw water that has passed through the packed bed of the cation exchange resin 5 is collected on the first screen member 12 at the bottom of the resin container 2, and then the first water collection pipe 11 and the first flow path 8. , The treated water line 17 and the first drainage line 33 are discharged out of the system. After the cleaning process is started, when the integrated time in the state where the pressure switch 18 is on, that is, with the raw water pressure reaches a predetermined time and a predetermined amount of cleaning is secured, the process proceeds to the water replenishment process.

  In the water replenishing step, as shown in FIG. 7, the third on-off valve 22 and the fifth on-off valve 32 are each set to an open state by a command signal from the controller. On the other hand, the first on-off valve 19, the second on-off valve 20, the fourth on-off valve 27, the sixth on-off valve 34, the seventh on-off valve 37, and the eighth on-off valve 39 are set in a closed state. Is done. The raw water flowing through the raw water line 16 is supplied as make-up water to the primary side of the ejector 26 via the first regeneration line 23. At this time, suspended substances in the raw water are removed by the strainer 24, and the flow rate of the raw water is adjusted to a predetermined range by the first constant flow valve 25.

  The makeup water from the ejector 26 is supplied into the salt water tank 40 through the regenerant supply line 31. At this time, the air check ball 46 is separated from the valve seat portion 47 by the pressure of makeup water. As a result, makeup water can flow into the salt water tank 40. And in the said salt water tank 40, makeup water is supplied with progress of the said water replenishment process, and a water level rises with time.

  At the time of the water replenishment step, the flow rate detecting means 48 detects the integrated flow rate in the makeup water supply direction, that is, the integrated flow rate of makeup water flowing from the ejector 26 to the salt water tank 39 via the salt water supply line 31. And when this detected value reaches predetermined amount, the said water replenishment process is complete | finished. When the water replenishment step is completed, the water flow operation is performed again. The makeup water supplied into the salt water tank 40 dissolves the regenerated salt 42 during the water flow operation to generate saturated salt water.

  Here, the supply amount of makeup water is set based on the necessary amount of the regenerated salt 42 that can restore the exchange capacity of the cation exchange resin 5 to a predetermined value, and saturated salt water is generated from this necessary amount. Set to an amount that can be. Further, the detected value of the integrated flow rate from the start point to the end point of the water replenishment step, that is, the supply amount of makeup water is used to determine the shortage of the regenerated salt 42 in the next regeneration step.

  Here, in the conventional ion exchange device, the supply amount of makeup water is controlled by a salt water valve having a complicated structure. In this case, when the float valve that determines the replenishment stop position is fixed by the crystalline salt, a predetermined amount of makeup water is not supplied, and the amount of salt water is insufficient. And the quality of treated water is deteriorated due to poor regeneration. For this reason, in the first embodiment, the configuration of the salt water supply device 4 is simplified by supplying a certain amount of makeup water based on the integrated flow rate in the makeup water supply direction.

By the way, during the regeneration operation, raw water that bypasses the resin container 2 is supplied in response to a demand point request. During the regeneration operation, since the third on-off valve 22 is always set to the open state, the raw water flowing through the raw water line 16 on the upstream side of the first on-off valve 19 passes through the bypass line 21. It is supplied to the treated water line 17 on the downstream side of the second on-off valve 20. Therefore, it is possible to use water at the demand point even during the regeneration operation. In particular, when the ion exchange devices 1 are installed in series, when the upstream side is in the regeneration operation, soft water is supplied by the water flow operation on the downstream side. On the other hand, when the downstream side is in the regeneration operation, soft water is supplied by the upstream water flow operation.

  According to the first embodiment described above, it is possible to realize an ion exchange device that can improve the reliability of the regeneration operation. As a result, defective regeneration and extrusion failure of the ion exchange resin can be effectively prevented, and treated water adjusted to a predetermined water quality can be stably supplied. Moreover, according to this invention, the ion exchange apparatus which can simplify the structure of a salt water supply apparatus is realizable. As a result, the time required for assembly and maintenance of the ion exchange apparatus can be shortened, and the costs for manufacturing and maintenance can be suppressed.

(Second embodiment)
In the first embodiment, the salt water in the salt water tank 40 is supplied using the ejector 26, but other means may be used. For example, a pump (not shown) may be provided in the salt water supply line 31 so that salt water in the salt water tank 40 is supplied to the first regeneration line 23 by this pump. In this case, the pump is driven at the start of the regeneration step, and is controlled to stop when the instantaneous flow rate in the salt water supply direction detected by the flow rate detection means 48 becomes zero.

(Third embodiment)
Although said 1st embodiment and said 2nd embodiment demonstrated the case where the said ion exchange apparatus 1 was used as a soft water apparatus, it can also be used as another ion exchange apparatus. For example, in the ion exchange device 1, if the cation exchange resin 5 is replaced with an anion exchange resin, it can be used as a nitrate nitrogen removal device.

DESCRIPTION OF SYMBOLS 1 Ion exchange apparatus 2 Resin accommodating part 3 Flow path control valve 5 Cation exchange resin (ion exchange resin)
16 Raw Water Line 23 First Regeneration Line 25 Constant Flow Valve 26 Ejector 28 First Orifice 29 Second Regeneration Line 30 Second Orifice 31 Salt Water Supply Line 40 Salt Water Tank

Claims (1)

The resin container 2 filled with the ion exchange resin 5, the flow path control valve 3 for switching between the water flow operation and the regeneration operation, the salt water tank 40 for storing the salt water used for regeneration, and the flow path control valve 3 are controlled. An ion exchange apparatus comprising a controller for switching between a flow path for water flow and a flow path for regeneration, wherein the flow path control valve 3 is connected to the salt water tank 40 via a salt water supply line 31;
The flow path control valve 3 is connected to the first regeneration line 23 connected to the raw water line 16 in order from the raw water line 16 side, and to the salt water supply line 31 on the discharge side of the nozzle portion. An ejector 26 and a first orifice 28, and a second orifice 30 provided in a second regeneration line 29 connected to the first regeneration line 23 between the ejector 26 and the first orifice 28,
The controller controls the flow path control valve 3,
The water supply operation in which raw water is distributed from the upper part of the resin container 2, softened in the process of flowing down the packed bed of the ion exchange resin 5, and collected at the bottom of the resin container 2,
A portion of the regenerated liquid from the ejector 26 is distributed from the bottom of the resin container 2 through the first regeneration line 23, passes through the packed bed of the ion exchange resin 5 in an upward flow, and the ion exchange resin. 5, the remaining portion of the regenerated liquid from the ejector 23 is distributed from the upper part of the resin container 2 via the second regeneration line 29, and the packed bed of the ion exchange resin 5 flows downward. The ion exchange device is characterized in that the ion exchange apparatus performs the regeneration operation of passing through and regenerating the upper layer portion of the ion exchange resin 5 and collecting water in the vicinity of the center portion of the packed bed height of the ion exchange resin 5.

Images