JP6022194B2 - TOC reduction device and TOC reduction method - Google Patents

Description

  The present invention relates to a TOC reduction device and a TOC reduction method for reducing the TOC concentration of raw water and plant water.

  For example, in a nuclear power plant, rain water or mountain stream water is stored as raw water, and after the raw water is filtered, pure water produced by processing with a pure water device is used as primary cooling water. The raw water obtained by storing rainwater and mountain stream water has a high TOC concentration of several thousand to several tens of thousands of ppb. On the other hand, a method using ozone or ultraviolet rays is known as a method for lowering the TOC concentration water having a low TOC concentration of several hundred ppb.

  A technique related to a pure water production apparatus that more effectively removes a TOC that has been difficult to remove with a conventional pure water production apparatus is known (for example, see Patent Document 1). In addition, it is possible to efficiently obtain a distillate that can be reused or discharged in normal or existing facilities from radioactive waste liquid, and a method for removing radioactive substances and TOC that can reduce the volume of radioactive waste and removal A technique related to the apparatus is known (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 6-063546 JP 2009-244089 A

  By the way, when rainwater or mountain stream water is stored and used as raw water, the TOC concentration of the stored raw water changes depending on the increase or decrease in rainfall and turbidity. Therefore, there has been a demand for a TOC reduction device and a TOC reduction method that can appropriately reduce the TOC concentration with existing equipment even when the TOC concentration of the raw water changes. Moreover, even when the effect of reducing the TOC concentration of a water treatment device such as a filtration device or a pure water device is unknown, a TOC reduction device and a TOC reduction method that can appropriately reduce the TOC concentration of raw water and plant water are desired. It was.

  So, even if this invention changes the TOC density | concentration of the raw water and plant water with high TOC density | concentration obtained by storing water and stream water, or the case where the reduction effect of the TOC density | concentration of a water treatment apparatus is unknown. An object of the present invention is to provide a TOC reduction device and a TOC reduction method that appropriately reduce the TOC concentration.

In order to solve the above-mentioned problem, the invention of claim 1 is a TOC reduction device for reducing the TOC concentration of raw water and plant water, a water storage tank for storing the raw water and plant water, and a downstream of the water storage tank. The filtration device installed in the filter for filtering the raw water and plant water and the filtrate filtered by the filtration device can be stored, and the stored filtrate can be returned to the filtration device and returned to the water storage tank. , and the the filtrate tank can be disposed of, the disposed downstream of the filtered water tank, a pure water device for generating a desalted by pure water filtered water transferred from said filtered water tank, the pure water device with storing the pure water produced in a possible reflux of pure water was stored in the pure water device is transmitted back to the reservoir, and the pure water tank capable of disposal, the TOC concentration of the filtered water Past Compared with the first predetermined value based on the TOC concentration of the peroxide, the first case is higher than the predetermined value, until said TOC concentration of the filtered water falls below the first predetermined value, said filtering the filtered water The apparatus is refluxed and the filtration is repeated, and the TOC concentration of the filtrate is compared with a first threshold value based on the TOC concentration of the past filtrate water. Returning or discarding to the water tank, comparing the TOC concentration of the pure water with a second predetermined value based on the TOC concentration of the pure water in the past, and if it is higher than the second predetermined value, the TOC concentration of the pure water until but equal to or less than the second predetermined value, the pure water by refluxing the pure water device to repeatedly desalting, the pure water TOC concentration second based on the TOC concentration of the past pure water Compared with a threshold value, if it is higher than the second threshold value, And control means for returning or discarded serial reservoir, a TOC reduction apparatus comprising: a.

According to this invention, until the TOC concentration of the filtered water in the filtered water tank becomes equal to or lower than the first predetermined value, the filtered water is refluxed to the filtering device, and the filtration is repeated. Until the TOC concentration becomes equal to or lower than the second predetermined value, the pure water is returned to the pure water device, and desalting is repeated. In addition, when the TOC concentration of filtered water is higher than the first threshold value, the filtered water is returned to the storage tank or discarded. When the TOC concentration of pure water is higher than the second threshold value, the pure water is Return to the water tank or discard.

The invention of claim 2 is the TOC reduction device according to claim 1, wherein the TOC concentration at the inlet and outlet of the filtration device , the TOC concentration in the filtrate tank, the TOC concentration at the inlet of the pure water device , the pure water A storage means for storing the TOC concentration in the water tank is provided, and the control means recirculates the filtered water by recirculating the filtered water to the filtration device based on the TOC concentration of the filtered water stored in the storage means. Based on the TOC concentration of the pure water stored in the storage means, the pure water is returned to the pure water device based on the number of recirculations of 1 or the necessity of returning or discarding the filtered water to the water storage tank. Then, the second number of recirculation times for repeating desalting or the necessity of returning or discarding the pure water to the water storage tank is formulated.

The invention of claim 3 is a TOC reduction method for reducing the TOC concentration of raw water and plant water, wherein the raw water and plant water parked in a storage tank are filtered by a filtering device, and the filtered water tank is filtered by the filtering device. Purified water stored in the downstream of the filtrate water tank that stores filtered filtrate water and can be recirculated to the filtration device, can be returned to the water storage tank, and can be discarded. In the device, pure water is generated by desalting from the filtered water, and the pure water generated in the pure water device is stored in a pure water tank, and the stored pure water can be returned to the pure water device , It can be returned to the water tank, can be discarded , and the control means compares the TOC concentration of the filtered water with a first predetermined value based on the TOC concentration of the past filtered water, and from the first predetermined value. It is higher, tO of the filtered water Concentration until below the first predetermined value, repeatedly filtered by refluxing the filtrate in the filtration device, a first threshold value based on the TOC concentration of the filtered water to the TOC concentration of the past filtered water When the filtered water is higher than the first threshold value, the filtered water is returned to the water tank or discarded, and the TOC concentration of the pure water is set to a second predetermined value based on the TOC concentration of the pure water in the past. comparison, if greater than the second predetermined value, the TOC concentration of the pure water until the second predetermined value or less, to the pure water repeatedly allowed desalting recirculated to the pure water device, the Comparing the TOC concentration of pure water with a second threshold value based on the TOC concentration of pure water in the past, and returning or discarding the pure water to the water storage tank if it is higher than the second threshold value. TOC reduction method characterized by the above.

The invention of claim 4 is the TOC reduction method according to claim 3, wherein the TOC concentration at the inlet and outlet of the filtration device , the TOC concentration in the filtrate tank, the TOC concentration at the inlet of the pure water device , the pure water device The TOC concentration in the water tank is stored, and on the basis of the stored TOC concentration of the filtered water, the filtered water is refluxed to the filtering device to repeat filtration or to the water storage tank of the filtered water. Whether or not it is necessary to return or discard the pure water, based on the stored TOC concentration of the pure water, the pure water is recirculated to the pure water device to repeat desalting or the pure water It is characterized by the necessity of returning to the water tank or disposal.

  According to the invention described in claim 1 or claim 3, until the TOC concentration of the filtered water is equal to or lower than the first predetermined value, the filtered water is refluxed to the filtration device, and the filtration is repeated. Even if it is the TOC concentration of raw water with a high TOC concentration obtained by storing water and mountain stream water by recirculating to the deionized water device and repeating desalting until the water becomes below the second predetermined value, the power generation equipment It can be automatically reduced appropriately until it can be used in (plant). Moreover, even if the TOC concentration of the tank storage water changes by providing a reflux line (circulation line) for refluxing filtered water to the filtration device or refluxing pure water to the pure water device, it is appropriately refluxed. By performing the treatment, the quality of water supplied to the plant can be properly managed at all times.

  In addition, when reducing the TOC concentration of raw water and plant water, even if the effect of reducing the TOC concentration of a water treatment device such as a filtration device or a pure water device is unknown, the TOC of filtered water in the filtrate water tank The necessity of reflux can be determined based on the concentration and the TOC concentration of pure water in the pure water tank. That is, even when the treatment capacity of the water treatment apparatus is uncertain, the TOC concentration of raw water and plant water can be appropriately reduced.

  Moreover, since the TOC concentration can be appropriately reduced by setting the first predetermined value and the second predetermined value, the TOC concentration that can be used as raw water and plant water can be set. That is, for example, even when raw water with a large amount of rainfall and high turbidity is stored, it is reduced to the first predetermined value or the second predetermined value, that is, until the TOC concentration falls within an appropriate range. Can do. Then, by appropriately managing the TOC concentration in this way, it becomes possible to more strictly manage the water quality of the raw water and the plant water and protect the plant.

  Furthermore, by setting the first predetermined value and the second predetermined value, it is possible to manage the TOC concentration of filtered water in the filtrate tank and the TOC concentration of pure water in the pure water tank to be equal to or lower than the predetermined value. . That is, since it can manage so that the TOC density | concentration of the filtrate in a filtrate water tank or the pure water in a pure water tank may become appropriate, the TOC density | concentration of the water supplied to a pure water apparatus or a plant can be made appropriate. For this reason, the TOC concentration in the filtration device, pure water device, and plant is guaranteed, so it becomes easy to isolate the cause when a failure or abnormality occurs, and the failure or abnormality can be detected at an early stage or the cause can be investigated. It becomes possible to do.

  According to the invention described in claim 2 or claim 4, data is accumulated by storing the TOC concentration of filtered water and the TOC concentration of pure water, and based on the accumulated data, the first reflux count and the second You can formulate the number of reflux. For this reason, since the processing capability of the water treatment apparatus can be estimated from the accumulated data, the TOC concentration of raw water and plant water can be automatically and appropriately reduced. Further, as the data is accumulated, it is possible to estimate the treatment capacity of the water treatment device more accurately, and it is possible to formulate the first recirculation number and the second recirculation number with higher accuracy.

It is a schematic block diagram of the TOC reduction device according to Embodiment 1 of the present invention. It is a schematic block diagram which shows the flow path of the TOC reduction apparatus of FIG. It is a figure which shows the data of the TOC density | concentration in the TOC reduction apparatus of FIG. It is a figure which shows the relationship of the TOC density | concentration in the filtration apparatus inlet_port | entrance of the TOC reduction apparatus of FIG. 1, and a filtration apparatus exit. It is a figure which shows the TOC density | concentration and removal efficiency in the filtration apparatus inlet_port | entrance of the TOC reduction apparatus of FIG. It is a figure which shows the TOC density | concentration and removal amount in the filtration apparatus inlet_port | entrance of the TOC reduction apparatus of FIG. It is a figure which shows the TOC density | concentration and removal efficiency in the pure water apparatus entrance of the TOC reduction apparatus of FIG. It is a figure which shows the TOC density | concentration and removal amount in the pure water apparatus entrance of the TOC reduction apparatus of FIG. It is a chart figure which shows the determination process of the 1st determination task of FIG. It is a chart figure which shows the determination process of the 2nd determination task of FIG. It is a chart figure which shows the determination process of the 1st determination task of the TOC reduction apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the TOC density | concentration and removal efficiency in the filtration apparatus inlet_port | entrance of the TOC reduction apparatus of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 10 show Embodiment 1 of the present invention. The TOC reduction device 1 reduces the raw water and plant water TOC concentrations. As shown in FIG. 1, the TOC reduction device 1 mainly includes a storage unit 11, a TOC concentration meter 12 of a water storage tank, and a TOC concentration meter 13 at the inlet of the filtration device. A TOC concentration meter 14 at the outlet of the filtration device, a TOC concentration meter 15 at the filtered water tank, a TOC concentration meter 16 at the inlet of the pure water device, a TOC concentration meter 17 at the pure water tank, and a first determination task 18 , A second determination task 19 and a control unit 10 for controlling these and the like. As shown in FIG. 2, the TOC reduction device 1 mainly includes a water storage tank 20, a filtration device 30, a filtrate water tank 40, a pure water device 50, and a pure water tank 60. The TOC reduction device 1 is provided in a monitoring control server (not shown).

  The water storage tank 20 stores rainwater or mountain stream water as raw water and can be transferred to the filtration device 30. Here, in the later-described equipment downstream from the water storage tank 20, the raw water is mixed with the plant water refluxed by the later-described circulation lines L1 to L4. In this embodiment, the raw water, filtered water, and pure water include refluxed plant water.

  The filtration device 30 is installed downstream of the water storage tank 20, and can filter raw water and transfer it to the filtrate water tank 40. The filtration device 30 controls turbidity by condensing and sedimenting raw water. At this time, mainly the colloidal TOC substance is condensed and settled and removed.

  The filtered water tank 40 is installed downstream of the filtering device 30 and stores filtered water filtered by the filtering device 30 and can transfer the stored filtered water to the pure water device 50, or a first circulation described later. It can be refluxed to the filtration device 30 via the line L1.

  The pure water device 50 is installed downstream of the filtered water tank 40, desalted filtered water by the action of an ion exchange resin to generate pure water, and can be transferred to the pure water tank 60. The pure water device 50 controls the conductivity of pure water. At this time, mainly the ionic TOC substance is removed by the action of the ion exchange resin.

  The pure water tank 60 is installed downstream of the pure water device 50, stores pure water produced by the pure water device 50, and can supply the stored pure water to the plant, or a second circulation line described later. It can be recirculated to the pure water device 50 via L2.

  A flow path is formed between the water storage tank 20, the filtering device 30, the filtered water tank 40, the pure water device 50, and the pure water tank 60. In addition, valves (not shown) are provided on the inlet side and the outlet side of each device, and the flow rate and flow path (positive flow, reflux) can be controlled by adjusting the valve opening. . Here, positive flow is a flow from upstream to downstream, and reflux is a flow from downstream to upstream. The reflux flow path is constituted by a first circulation line L1 and a second circulation line L2.

  The 1st circulation line L1 recirculates filtered water from the filtered water tank 40 to the filtration apparatus 30. FIG. Then, by closing the outlet side valve of the filtrate water tank 40 and opening the inlet side and outlet side valves of the first circulation line L1, reflux flows into the first circulation line L1, and the filtrate is circulated. It is like that.

  The second circulation line L <b> 2 returns pure water from the pure water tank 60 to the pure water device 50. Then, by closing the outlet side valve of the pure water tank 60 and opening the inlet side and outlet side valves of the second circulation line L2, reflux flows into the second circulation line L2, and the pure water circulates. It is like that.

  The first return / discard line L3 is connected to the first circulation line L1, and returns filtered water to the water tank 20 or discards it.

  The second return / discard line L4 is connected to the second circulation line L2, and returns pure water to the water tank 20 or discards it.

  The control unit 10 is configured by a CPU (Central Processing Unit) or the like, and when the TOC reduction device 1 starts operation, activates a first determination task 18 and a second determination task 19 to be described later, and in the filtrate water tank 40 The filtered water is refluxed to the filtration device 30 until the TOC concentration of the filtered water becomes equal to or lower than the first predetermined value, and the filtration is repeated, and the TOC concentration of pure water in the pure water tank 60 is equal to or lower than the second predetermined value. Until this time, the program and task have a function of controlling the pure water to flow back to the pure water device 50 and repeat desalting. In addition, the control unit 10 controls the valves (not shown) of the first circulation line L1 and the second circulation line L2 based on the determination results of the first determination task 18 and the second determination task 19. , Has a function of transmitting a control signal for switching the flow path.

  The storage unit 11 stores the TOC concentration measured by each TOC densitometer 12 to 17, programs and tasks necessary for the processing of the control unit 10, and the like.

  The TOC concentration meter 12 of the water tank is disposed in the water tank 20, measures the TOC concentration of the raw water in the water tank 20, transmits it to the control unit 10, and is stored by the storage unit 11. Yes.

  The TOC concentration meter 13 at the inlet of the filtration device is disposed in the filtration device 30, measures the TOC concentration of the raw water at the inlet of the filtration device 30, transmits it to the control unit 10, and stores it in the storage unit 11. It has become.

  The TOC concentration meter 14 at the outlet of the filtration device is disposed in the filtration device 30, measures the TOC concentration of the filtered water at the outlet of the filtration device 30, transmits it to the control unit 10, and stores it in the storage unit 11. It has become.

  The TOC concentration meter 15 of the filtrate water tank is disposed in the filtrate water tank 40, measures the TOC concentration of the filtrate water in the filtrate water tank 40, transmits the TOC concentration to the control unit 10, and is stored by the storage unit 11. It is like that.

  The TOC concentration meter 16 at the inlet of the deionized water device is disposed in the deionized water device 50, measures the TOC concentration of filtered water at the inlet of the deionized water device 50, transmits it to the control unit 10, and stores it in the storage unit 11. It has come to be.

  The TOC concentration meter 17 of the pure water tank is disposed in the pure water tank 60, measures the TOC concentration of pure water in the pure water tank 60, transmits it to the control unit 10, and stores it in the storage unit 11. It is like that.

  The TOC concentrations measured by these TOC densitometers 12 to 17 are shown in FIGS.

FIG. 3 shows the TOC concentration, the average value, the maximum value, and the minimum value in each device (each processing point) for the past three years (May 1, Y1 to February 1, Y4). Specifically, for example, the TOC concentration of the water tank 20 changes within the range of the minimum value 911 ppb to the maximum value 2565 ppb, and the average value is 1647 ppb. The average value of the TOC concentration is 1701 ppb at the filter inlet, 825 ppb at the filter outlet, 702 ppb at the pure water inlet, and 83 ppb at the pure water tank, so that the water quality is sufficient for plant water. I understand.

  4-6 has shown the TOC density | concentration in the filtration apparatus 30, removal efficiency, and removal amount. These data show that the removal efficiency is high when the TOC concentration is within a predetermined range, but the removal efficiency is lowered when the TOC concentration is equal to or higher than the predetermined range. Here, the removal efficiency is a value calculated by {(inlet TOC concentration) − (outlet TOC concentration)} / (inlet TOC concentration)). Specifically, when the TOC concentration at the inlet of the filtration device is 2300 ppb or more, the TOC concentration at the outlet of the filtration device is less likely to be reduced (removal efficiency is reduced), and it can be determined that the TOC removal limit value in the filtration device 30 is reached. .

  Here, there is a correlation as shown in FIG. 3 between the TOC concentration of the filtrate water tank, the TOC concentration at the filtration device inlet, and the TOC concentration at the filtration device outlet, and the TOC concentration at the filtration device inlet and the filtration device. The TOC concentration of the filtrate tank can be predicted from the TOC concentration at the outlet. For this reason, in the first determination task 18 described later, whether or not reflux is necessary is determined based on the TOC concentration at the inlet of the filtration device, instead of the TOC concentration in the filtrate water tank.

  7 and 8 show the TOC concentration, removal efficiency, and removal amount in the pure water device 50. FIG. From these data, as with the TOC concentration in the filtration device 30, it can be seen that the TOC concentration shows a high removal efficiency within a predetermined range, but the removal efficiency decreases when the TOC concentration exceeds the predetermined range.

  Here, there is a correlation as shown in FIG. 3 between the TOC concentration of the pure water tank and the TOC concentration at the inlet of the pure water device. From the TOC concentration at the inlet of the pure water device, the TOC concentration of the pure water tank. Is predictable. For this reason, in the second determination task 19 described later, whether or not recirculation is necessary is determined based on the TOC concentration at the inlet of the pure water device instead of the TOC concentration in the pure water tank.

  From these data, when the TOC concentration is high or the TOC concentration is low, the water quality at the inlet of the filtration device 30 and the pure water device 50 exceeds the processing capacity of each device, and therefore the TOC concentration cannot be sufficiently reduced. I understand that.

  The first determination task 18 is a program or task that performs the processing of the flowchart shown in FIG. The first determination task 18 is a function that performs processing so as to recirculate the filtrate to the filtration device 30 and repeat the filtration until the TOC concentration of the filtrate in the filtrate tank 40 becomes equal to or lower than the first predetermined value. have. Specifically, the filtered water is refluxed to the filtration device 30 via the first circulation line L1 until the TOC concentration measured by the TOC concentration meter 13 at the filtration device inlet becomes equal to or lower than the first predetermined value. It has a function of processing so as to repeat filtration. Here, the first predetermined value is an average value of the TOC concentration, and is specifically 1701 ppb as shown in FIG. If the first predetermined value is an average value of the TOC concentration at the inlet of the filtration device, the TOC concentration is reduced by the filtration device 30 and becomes a concentration that can be processed by the pure water device 50. It becomes possible to make the TOC concentration equal to or lower than the first predetermined value.

  The first determination task 18 is activated by the control unit 10 when the TOC reduction device 1 starts operation. Specifically, it is determined whether or not the TOC concentration measured by the TOC densitometer 13 at the inlet of the filtration device is equal to or lower than a first predetermined value (step S1). In the case of “NO”, the filtered water is refluxed to the filtering device 30 via the first circulation line L1 (step S2). And when it is below 1st predetermined value (in the case of "YES"), filtered water is transferred to the downstream pure water apparatus 50 (step S3). The first determination task 18 as described above maintains the TOC concentration of the filtered water transferred from the filtered water tank 40 to the pure water device 50 at a first predetermined value or less.

  The second determination task 19 is a program or task that performs the processing of the flowchart shown in FIG. The second determination task 19 performs processing so as to recirculate the pure water to the pure water device 50 and repeat desalting until the TOC concentration of the pure water in the pure water tank 60 is equal to or lower than the second predetermined value. Has the function to perform. Specifically, the second determination task 19 is configured to remove the pure water from the second circulation line L2 until the TOC concentration measured by the TOC concentration meter 16 at the pure water device inlet becomes equal to or lower than a second predetermined value. And having a function of performing treatment so as to repeat desalting by refluxing to the deionized water device 50. Here, the second predetermined value is an average value of the TOC concentration, specifically, 702 ppb as shown in FIG. If the second predetermined value is the average value of the TOC concentration at the inlet of the deionized water device, the TOC concentration is reduced by the deionized water device 50 and becomes a concentration usable in the plant, and the TOC of pure water in the deionized water tank 60 is obtained. It becomes possible to make the density below the second predetermined value.

  The second determination task 19 is activated by the control unit 10 when the TOC reduction device 1 starts operation. Specifically, it is determined whether or not the TOC concentration measured by the TOC concentration meter 16 at the inlet of the deionized water device is equal to or lower than the second predetermined value (step S4). In the case of “NO”, the pure water is returned to the pure water device 50 through the second circulation line L2 (step S5). And when it is below a 2nd predetermined value (in the case of "YES"), a pure water is transferred to a plant (step S6). Such a second determination task 19 keeps the TOC concentration of pure water transferred from the pure water tank 60 to the plant below a second predetermined value.

  Next, the TOC reduction method and operation in the TOC reduction device 1 having such a configuration will be described.

  First, the TOC reduction device 1 starts operation, the first determination task 18 and the second determination task 19 are started by the control unit 10, the TOC concentration is measured by each TOC concentration meter 12-17, and the control unit 10 and transmitted to the storage unit 11 at any time.

  The raw water stored in the water storage tank 20 is filtered by the filtration device 30 and stored in the filtered water tank 40.

  Then, as shown in FIG. 9, the first determination task 18 determines whether or not the TOC concentration measured by the TOC concentration meter 13 at the inlet of the filtration device is equal to or less than a first predetermined value in step S1. The

And when it determines with it not being below the 1st predetermined value by step S1 (in the case of "NO"), it progresses to step S2 and the filtrate in the filtrate tank 40 is passed through the 1st circulation line L1. And refluxed to the filtration device 30. Thereby, filtered water is repeatedly filtered with the filtration apparatus 30. At this time, when the TOC concentration of the filtered water is equal to or higher than the first threshold value or when recirculation is repeated a predetermined number of times or more, the filtering device 30 cannot process the filtered water. It is transferred to the return / discard line L3.

  If it is determined in step S1 that the value is equal to or less than the first predetermined value (in the case of “YES”), the process proceeds to step S3, and the filtrate is transferred from the filtrate tank 40 to the pure water device 50. .

  As shown in FIG. 10, the second determination task 19 determines in step S4 whether or not the TOC concentration measured by the TOC concentration meter 16 at the inlet of the deionized water device is equal to or less than a second predetermined value. .

If it is determined in step S4 that it is not equal to or less than the second predetermined value (in the case of “NO”), the process proceeds to step S5, and the pure water in the pure water tank 60 is passed through the second circulation line L2. The pure water apparatus 50 is refluxed. Thereby, pure water is repeatedly desalted by the pure water apparatus 50. At this time, when the TOC concentration of pure water becomes equal to or higher than the second threshold value or when recirculation is repeated a predetermined number of times, the pure water device 50 cannot process the pure water. To the return / discard line L4.

  If it is determined in step S4 that it is equal to or smaller than the second predetermined value (in the case of “YES”), the process proceeds to step S6, and the pure water is transferred from the pure water tank 60 to the plant.

  In this way, the TOC concentration of filtered water transferred from the filtered water tank 40 to the pure water device 50 and the TOC concentration of pure water transferred from the pure water tank 60 to the plant are appropriately maintained.

  As described above, according to the TOC reduction device 1, the filtered water is refluxed to the filtering device 30 until the TOC concentration of the filtered water becomes equal to or lower than the first predetermined value, and the filtration is repeated, so that the TOC concentration of pure water is reached. The TOC concentration is reduced even if it is raw water with high TOC concentration obtained by storing water and mountain stream water by recirculating to the deionized water device 50 and desalting until the water reaches a second predetermined value or less. It can be automatically reduced appropriately until it can be used. Even when the TOC concentration of the tank storage water changes by providing reflux lines (circulation lines) L1 and L2 for refluxing filtered water to the filtration device 30 and refluxing pure water to the pure water device 50. The water quality supplied to the plant can be appropriately managed at any time by appropriately refluxing and performing the treatment.

  Moreover, when reducing the TOC concentration of raw water and plant water, even if the effect of reducing the TOC concentration of a water treatment device such as the filtration device 30 or the pure water device 50 is unknown, the filtration in the filtrate water tank 40 is performed. Based on the TOC concentration of water and the TOC concentration of pure water in the pure water tank 60, the necessity of reflux can be determined. That is, even when the treatment capacity of the water treatment apparatus is uncertain, the TOC concentration of raw water and plant water can be appropriately reduced.

  Moreover, since the TOC concentration can be appropriately reduced by setting the first predetermined value and the second predetermined value, the TOC concentration that can be used as raw water can be set. That is, for example, even when raw water with a large amount of rainfall and high turbidity is stored in the water tank 20, up to the first predetermined value or the second predetermined value, that is, the TOC concentration is in an appropriate range. Can be reduced. And by managing TOC density | concentration appropriately in this way, it becomes possible to manage raw | natural water more strictly, and to protect power generation equipment (plant). Specifically, it is possible to reduce the influence of the component of the TOC substance on the pressure vessel of the plant.

  Furthermore, by setting the first predetermined value and the second predetermined value, the TOC concentration of the filtered water in the filtered water tank 40 and the TOC concentration of the pure water in the pure water tank 60 become equal to or lower than the predetermined values. Can manage. That is, since the TOC concentration of the filtered water in the filtrate water tank 40 and the pure water in the pure water tank 60 can be managed appropriately, the TOC concentration of the water supplied to the pure water device 50 and the plant is made appropriate. Can do. For this reason, since the TOC concentration in the filtration device 30, the pure water device 50, and the plant is guaranteed, it becomes easy to isolate the cause when a failure or abnormality occurs, to detect the failure or abnormality early, It becomes possible to investigate.

  Furthermore, the first determination task 18 and the second determination task 19 cause the filtered water and pure water to recirculate and merge with the positive flow from the water storage tank 20, thereby diluting and reducing the TOC concentration. For this reason, even when raw water having a relatively high TOC concentration is stored in the water tank 20, it can be used as a water resource by being diluted. That is, since it becomes easy to secure water resources, pure water can be stably supplied to the plant, so that the stability and safety of plant operation are improved.

(Embodiment 2)
FIG. 11 shows a second embodiment of the present invention. In this embodiment, the processes of the first determination task 180 and the second determination task (not shown) are different from those in the first embodiment. In addition, about the structure equivalent to Embodiment 1, the description is abbreviate | omitted by attaching | subjecting the same code | symbol. The same applies to the following embodiments.

  The first determination task 180 of this embodiment calculates the first recirculation number (first recirculation number) for recirculating the filtered water from the TOC concentration at the inlet of the filtration device and repeating the filtration. It has a function of returning to the filtration device 30 until the number of circulations. Here, the memory | storage part 11 memorize | stores data, such as TOC density | concentration, removal efficiency, and removal amount in the filtration apparatus 30 and the pure water apparatus 50 which are obtained whenever it starts the filtration apparatus 1 as shown in FIGS. ,accumulate. Then, the first determination task 180 formulates a first recirculation number (hereinafter simply referred to as “circulation number”) based on the stored TOC concentration.

  Specifically, as shown in FIG. 11, the first determination task 180 formulates the number of circulations in the filtration device 30 of the filtered water in step S11. Specifically, for example, selecting (calculating) data to be used for formulating the number of circulations from past data accumulated in the storage unit 11 is performed by using a statistical method such as a weighted average or a normal distribution. Or data similar to the TOC concentration of the water storage tank 20 is selected. Here, data such as the TOC concentration, the removal efficiency, and the removal amount in the filtration device 30 and the pure water device 50 shown in FIGS. As shown in FIG. 4 to FIG. 6, when the TOC concentration at the inlet of the filtration device is 2300 ppb or more, the TOC concentration at the outlet of the filtration device is not easily lowered (removal efficiency is lowered), and the TOC is performed once (one-through) in the filtration device 30. It can be determined that this is the removal limit value. That is, when the TOC concentration at the inlet of the filtration device is 2300 ppb or less, the TOC can be sufficiently removed by one-through (without circulation). Further, for example, when the TOC concentration at the inlet of the filtration device is 3400 ppb, the TOC concentration is reduced to 2720 ppb by one filtration, so the TOC concentration when it is circulated 6 times is 3400 × (0.8 × 0. 8 × 0.8 × 0.8 × 0.8 × 0.8) = 891.26 ppb, and the TOC concentration is satisfactory even if it is transferred to the pure water device 50.

Therefore, as shown in FIG.
(A1) If the TOC concentration at the inlet of the filtration device is 2300 ppb or less, one-through (no circulation)
(A2) When the TOC concentration at the inlet of the filtration device is 2300 to 3400 ppb, there is circulation (A3) When the TOC concentration at the inlet of the filtration device is 3400 ppb or more, it cannot be used and may be returned to the storage tank 20 or discarded.
further,
(A4) When the TOC concentration at the inlet of the filtration device is 1300 ppb or 1660 ppb, the TOC concentration is low and the removal efficiency in the filtration device 30 is low, but the removal efficiency in the pure water device 50 is high, and the TOC concentration of pure water is sufficient (In FIG. 3, 71.5 ppb on February 1, Y2 and 88.2 ppb on November 1, Y3). That is, it can be seen that the TOC substance is not removed by the filtration device 30 but is removed in a large amount by the pure water device 50. In such a case, the number of circulations in the filtration device 30 is suppressed, and the number of circulations in the pure water device 50 is controlled to increase.

  Here, the number of circulations in each device in the cases of (A2) and (A4) is set by estimating and calculating from accumulated past data. In addition, it is possible to estimate with higher accuracy by taking into account fluctuation factors such as seasonal fluctuations and weather fluctuations. In this way, processing accuracy can be improved by processing while accumulating past data so that optimum processing can be performed automatically even in a water treatment device with uncertain processing capacity. It has become.

  And it is determined whether it reached | attained the frequency | count of circulation (step S12), and when not having reached (in the case of "NO"), filtered water is recirculated to the filtration apparatus 30 via the 1st circulation line L1. (Step S13). When it reaches (in the case of “YES”), the process proceeds to step S14.

  Then, it is determined whether or not the TOC concentration measured by the TOC densitometer 13 at the inlet of the filtration device is equal to or lower than the first predetermined value (step S14). When the TOC concentration is not equal to or lower than the first predetermined value ("NO") In the case of), the filtered water is refluxed to the filtration device 30 via the first circulation line L1 (step S15). And when it is below a 1st predetermined value (in the case of "YES"), filtered water is transferred to the downstream pure water apparatus 50 (step S16).

  Further, the second determination task of this embodiment performs the same processing as the first determination task 180, and after formulating the second number of recirculation (hereinafter simply referred to as “circulation number”), It returns to the pure water apparatus 50 until it reaches. And it recirculate | refluxs to the pure water apparatus 50 until it becomes below 2nd predetermined value, Then, it transfers to a plant.

Here, the number of circulations in the pure water device 50 is
(A5) One-through (no circulation) when the TOC concentration at the pure water device inlet is 1000 ppb or less
(A6) When the TOC concentration at the pure water device inlet is 1000 to 1200 ppb, there is circulation. (A7) When the TOC concentration at the pure water device inlet is 1200 ppb or more, it is unusable and is set to be returned to the water tank 20 or discarded.

  Here, the number of circulations in the case of (A6) is set by estimating and calculating from past data accumulated in the same manner as the first determination task 180.

  By doing in this way, the first determination task 180 and the second determination task use not only the number of circulations but also the first predetermined value or less and the second predetermined value or less as an end condition for reflux. It is possible to supply treated water with stable water quality even against irregular water quality fluctuations.

  Moreover, data is accumulated by storing the TOC concentration of filtered water and the TOC concentration of pure water, and the number of circulations can be determined based on the accumulated data. For this reason, since the processing capability of the water treatment apparatus can be estimated from the accumulated data, the TOC concentration of raw water and plant water can be automatically and appropriately reduced. Further, as the data is accumulated, it is possible to estimate the treatment capacity of the water treatment device more accurately, and it is possible to formulate the number of circulations with higher accuracy.

  In addition, since fluctuation factors such as seasonal fluctuations and weather fluctuations are also taken into account, high-precision estimation is possible. In addition, it is possible to improve driving accuracy by processing while accumulating past data.

(Embodiment 3)
The third embodiment is different from the first and second embodiments in that a determination condition is set for each component of the TOC substance.

  That is, by acquiring and analyzing the data shown in FIGS. 3 to 8 for each component of the TOC substance, it is possible to more accurately grasp the correlation between the TOC substances and the correlation with weather information such as precipitation. Even when the treatment capacity of the water treatment apparatus is uncertain, the TOC concentration can be automatically and optimally managed. Here, attention may be paid particularly to a specific TOC substance that affects the plant.

Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention. For example, in the above embodiment, the first determination task 18 is based on whether or not the TOC concentration measured by the TOC concentration meter 13 at the inlet of the filtration device is equal to or lower than the first predetermined value. Whether or not the TOC concentration measured by the TOC concentration meter 14 at the outlet of the filtration device or the TOC concentration meter 15 at the filtrate water tank is equal to or less than a first predetermined value may be used as a determination criterion. Similarly to the first determination task 18, the second determination task 19 also determines whether or not the TOC concentration measured by the TOC concentration meter 16 at the pure water apparatus inlet is equal to or less than a second predetermined value. Although it was set as the reference, it may be determined whether or not the TOC concentration measured by the TOC concentration meter 17 of the pure water tank is equal to or less than the second predetermined value.

  In the second embodiment, the first determination task 180 formulates the number of circulations in the filtration device 30 for each of the conditions (A1) to (A4) shown in FIG. 5, but the conditions are shown in more detail, for example, in FIG. As described above, the number of circulations may be determined by subdividing as shown in (B1) to (Bn). By doing in this way, it is possible to supply treated water with more stable water quality against water quality fluctuations.

1 TOC reduction device 10 Control unit (control means)
11 Storage unit (storage means)
12 TOC Concentration Meter in Reservoir 13 TOC Concentration Meter at the Filtration Device Entrance 14 TOC Concentration Meter at the Filtration Device Exit 15 TOC Concentration Meter in the Filtration Water Tank 16 TOC Concentration Meter at the Pure Water Device Inlet 17 TOC Concentration Meter in the Pure Water Tank 18 1 judgment task 19 2nd judgment task 20 water storage tank 30 filtration device 40 filtrate water tank 50 pure water device 60 pure water tank L1 first circulation line L2 second circulation line

Claims (4)

A TOC reduction device that reduces the TOC concentration of raw water and plant water,
A water storage tank for storing the raw water and plant water;
A filtration device installed downstream of the water tank and filtering the raw water and plant water;
A filtered water tank that stores filtered water filtered by the filtering device, can recirculate the stored filtered water to the filtering device, can be returned to the water storage tank, and can be discarded.
A pure water device that is installed downstream of the filtrate water tank, and generates pure water by desalting the filtrate water transferred from the filtrate water tank;
While storing the pure water produced by the pure water device, the stored pure water can be returned to the pure water device, can be returned to the water storage tank, and can be discarded.
The TOC concentration of the filtered water is compared with a first predetermined value based on the TOC concentration of the past filtered water. When the TOC concentration is higher than the first predetermined value, the TOC concentration of the filtered water is equal to or lower than the first predetermined value. Until the filtered water is refluxed to the filtering device until the filtration is repeated, the TOC concentration of the filtered water is compared with a first threshold value based on the TOC concentration of the previous filtered water, and the first threshold is set. If it is higher than the value, the filtered water is returned to the water tank or discarded, and the TOC concentration of the pure water is compared with a second predetermined value based on the TOC concentration of the pure water in the past. If it is high, the pure water is refluxed to the pure water device until the TOC concentration of the pure water becomes equal to or lower than the second predetermined value, and desalting is repeated. Compared to the second threshold based on the TOC concentration, Higher than have value, and control means for returning or discards the pure water to the reservoir,
A TOC reduction device comprising: TOC concentration at the inlet and outlet of the filtration device , TOC concentration in the filtrate water tank, TOC concentration at the inlet of the pure water device , storage means for storing the TOC concentration in the pure water tank,
Based on the TOC concentration of the filtered water stored in the storage means, the control means recirculates the filtered water to the filtration device and repeats filtration or the filtered water to the water storage tank. Based on the TOC concentration of the pure water stored in the storage means, whether or not it is necessary to return or discard the second pure water or the pure water Formulating the necessity of returning or discarding water to the reservoir,
The TOC reduction device according to claim 1, wherein: A TOC reduction method for reducing the TOC concentration of raw water and plant water,
Filtering the raw water and plant water stationed in the water tank with a filtration device,
While storing the filtrate filtered by the filtration device in the filtrate water tank, the stored filtrate can be returned to the filtration device, can be returned to the water tank, and can be discarded.
In the pure water device installed downstream of the filtrate water tank, pure water is generated by desalting from the filtrate water,
The pure water generated in the pure water device is stored in the pure water tank, the stored pure water can be returned to the pure water device, can be returned to the water tank, and can be discarded.
The control means compares the TOC concentration of the filtered water with a first predetermined value based on the TOC concentration of the past filtered water, and when the TOC concentration is higher than the first predetermined value, the TOC concentration of the filtered water is the first TOC concentration. The filtered water is refluxed to the filtration device until it becomes a predetermined value or less, and filtration is repeated. The TOC concentration of the filtered water is compared with a first threshold value based on the TOC concentration of the previous filtered water, and the first When the threshold value is higher than 1, the filtered water is returned or discarded to the water tank, the TOC concentration of the pure water is compared with a second predetermined value based on the TOC concentration of the pure water in the past, and the second When the TOC concentration of the pure water is lower than the second predetermined value, the pure water is recirculated to the pure water device to repeat desalting, and the TOC concentration of the pure water is set in the past. Compared to a second threshold based on the TOC concentration of pure water of Higher than the serial second threshold, to return or discard the pure water to the reservoir,
The TOC reduction method characterized by the above-mentioned. Storing the TOC concentration at the inlet and outlet of the filtration device , the TOC concentration in the filtrate water tank, the TOC concentration at the inlet of the pure water device , and the TOC concentration in the pure water tank;
Based on the stored TOC concentration of the filtered water, the first reflux number for repeating the filtration by refluxing the filtered water to the filtering device or the necessity of returning or discarding the filtered water to the water storage tank is formulated. Based on the stored TOC concentration of the pure water, the pure water is recirculated to the pure water device to repeat desalination, or the necessity of returning or discarding the pure water to the water storage tank. Formulate the
The TOC reduction method according to claim 3.

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