JP2005050588A - Ion exchange system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ion exchange system making an effective use of ion exchange resin and realizing prolongation of life as well. <P>SOLUTION: The ion exchange system 2 is provided with ion exchangers 15a to 15d arrayed in parallel in a circulation system of treated liquid, a temperature sensing means 29 for sensing temperature of the treated liquid, electric conductivity sensing means 27, 28 for sensing electric conductivity of the treated liquid, a plurality of valves 20a to 20d for controlling passage of the treated liquid through each ion exchanger, and a control means 25 for controlling switching of each valve in accordance with results of sensing by the temperature sensing means 29 and electric conductivity sensing means 27, 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ion exchange system for a liquid to be treated that is circulated.
[0002]
[Prior art]
In a conventional fuel cell system mounted on a moving body, the coolant for the fuel cell is basically circulated. In this manner, the circulating coolant is required to maintain the purity of the coolant within a predetermined range in addition to the cooling function of the fuel cell.
[0003]
In addition, when the coolant is circulated and used for a long period of time, for example, elution ions from fuel cell housings and battery stacks, and eluates from various hoses, pipes, valves, etc. used in the coolant circulation system. Mixed in. As a result, the concentration of impurities in the cooling liquid gradually increases, and there is a risk of a “short-circuit between electrodes” due to a decrease in electrical insulation. Therefore, it is necessary to remove impurities in the cooling liquid as much as possible.
[0004]
Therefore, as a method for keeping the coolant at a predetermined purity, for example, there is an ion exchange method in which an ion exchanger filled with an ion exchange resin is provided in a circulation system.
[0005]
[Patent Document 1] JP-A-9-108657
[0006]
[Problems to be solved by the invention]
However, ion exchange resins undergo thermal degradation when exposed to high temperatures for long periods of time. Specifically, since the operating temperature of the fuel cell becomes high and the coolant also becomes high, the ion exchange resin undergoes thermal deterioration, and there is a problem that the life of the ion exchange resin is shortened.
[0007]
Moreover, when the ion exchange bottles are arranged in series as shown in Patent Document 1, all the ion exchange resins provided inside the ion exchange bottles are exposed to high temperatures for a long time, causing thermal degradation. There is a problem that the life is shortened.
[0008]
Therefore, the present invention has been made in view of the above problems, and as an example of the problem, an ion exchange system that efficiently uses an ion exchange resin and achieves a long life is also provided. It is in.
[0009]
[Means for Solving the Problems]
The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.
[0010]
An ion exchange system (2) of the present application includes an ion exchanger (15a to 15d) arranged in parallel with a circulation system of a liquid to be treated, and an electric conductivity detection means for detecting the electric conductivity of the liquid to be treated. (27, 28), a plurality of valves (20a to 20d) for controlling the passage of the liquid to be treated through the ion exchangers, and the valves based on the results detected by the electric conductivity detecting means. And a control means (25) for controlling the opening and closing. Further, the electric conductivity detection means is arranged upstream and downstream of the ion exchanger. Further, the liquid to be treated is a coolant for the fuel cell and may be mounted on a moving body. The control means may close all the valves based on the result detected by the electrical conductivity detection means.
[0011]
In this way, for example, the temperature is usually low at the start of operation of the fuel cell and the conductivity is high (bad), so the conductivity can be quickly restored to a low state by opening all the valves. Can do.
[0012]
The control means may open all the valves based on the result detected by the electrical conductivity detection means.
[0013]
In this way, for example, when the purity of the coolant exceeds a predetermined range, all valves are opened and all ion exchangers are used to enable low pressure loss and high flow rate processing. Thus, the purity of the coolant can be quickly brought within a predetermined range.
[0014]
Further, the control means determines the lifetime of the ion exchanger based on the result detected by the electrical conductivity detection means, and opens a valve corresponding to another ion exchanger based on the determination result. May be.
[0015]
In this way, for example, when the life of the ion exchanger is exhausted, the coolant can be passed through to the next ion exchanger. Can be used in turn.
[0016]
Further, the valve is arranged such that the plurality of ion exchangers are arranged in series or in parallel by opening and closing a predetermined valve.
[0017]
In this way, for example, the cooling liquid containing impurities can be passed through the plurality of ion exchangers by arranging the plurality of ion exchangers in series, so that the impurity removal efficiency can be extremely increased. . In addition, by arranging a plurality of ion exchangers in parallel, low pressure loss of the ion exchanger and high flow rate treatment of the liquid to be processed can be performed, the ion exchanger can be used efficiently, and the service life can be extended. It can also be realized.
[0018]
Further, the ion exchange system of the present application includes an ion exchanger disposed in parallel with a circulation system of the liquid to be processed, temperature detection means for detecting the temperature of the liquid to be processed, and electric conductivity of the liquid to be processed. Based on the results detected by the electrical conductivity detection means for detecting the flow, the plurality of valves for controlling the passage of the liquid to be treated through each ion exchanger, and the temperature detection means and the electrical conductivity detection means And control means for controlling the opening and closing of the valves. Further, the control means may open a predetermined valve at a high temperature so that the liquid to be processed passes only through a predetermined ion exchanger.
[0019]
In this way, for example, normally, the liquid to be treated is passed through all of the plurality of ion exchangers, low pressure loss and high flow rate treatment are performed, and only when the temperature of the liquid to be treated becomes high, The liquid to be treated is allowed to pass through only one of the plurality of ion exchangers by controlling the valve. Thereby, it can prevent that all the ion exchange resins are thermally deteriorated by being exposed to high temperature for a long time.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the ion exchange system of this application is explained in full detail. In the ion exchange system of the present application, an ion exchanger incorporating an ion exchange resin is arranged in parallel in a circulation system of a liquid to be treated, and for example, a coolant circulation of a mobile body (particularly, a vehicle or the like) equipped with a fuel cell system. It can be attached to the system.
[0021]
-First embodiment-
The ion exchange system in the first embodiment of the present application will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of an ion exchange system of the present embodiment, FIG. 2 is a flowchart showing valve control based on the electrical conductivity of the coolant in the present embodiment, and FIG. 3 is an ion amount (impurity amount) in the coolant. FIG. 4 is a flowchart showing the control of the valve based on the temperature of the coolant and the electric conductivity.
[0022]
As shown in FIG. 1, the ion exchange system 2 is provided with an ion exchange section 15 in a coolant circulation system (hereinafter referred to as “circulation line 5”). The ion exchange unit 15 removes impurities in the coolant. Impurities include, for example, elution ions from fuel cell housings and battery stacks, and eluates from various hoses, pipes, valves and the like used in the coolant circulation system. The ion exchange unit 15 includes first to fourth ion exchangers 15a, 15b, 15c, and 15d. The first to fourth ion exchangers 15 a to 15 d are arranged in parallel with the circulation line 5.
[0023]
The first to fourth ion exchangers 15a to 15d have case bodies 16, 16, 16, and 16, respectively. Inside the case body 16, ion exchange resins 17, 17, 17, and 17 are provided, respectively. The ion exchange resin 17 can be freely taken out from the case main body 16. The first to fourth ion exchangers 15a to 15d remove the impurities by causing the ion exchange resin 17 to adsorb positive or negative ions in the coolant. The first to fourth ion exchangers 15a to 15d are cartridge-type ion exchangers.
[0024]
The ion exchange resin 17 is made of, for example, a resin that captures one of OH groups and H groups, and removes impurities by replacing the impurities in the coolant with these groups. In addition, the ion exchange resin 17 has a type of ion exchange resin (for example, a property of a resin such as a fiber or a granule), a polarity (for example, an anode or a cathode), a polarity depending on the flow rate of the coolant, the type of impurities, and the like. An optimal combination of ratios (for example, mixing ratio of anode resin and cathode resin) is used. For example, a fibrous resin has good efficiency for removing impurities, but costs high. The granular material is advantageous in terms of cost, but the efficiency of removing impurities is inferior. Considering these comprehensively, the ion exchange resin to be used can be determined.
[0025]
Further, if the solid is contained in the cooling liquid, the ion exchange resin 17 is likely to be clogged. Therefore, a filter or the like may be provided on the upstream side of the ion exchange unit 15.
[0026]
In addition, in the circulation line 5, upstream of the ion exchangers 15 a to 15 d, the first to fourth ion exchangers 15 a to 15 d of the first to fourth ion exchangers 15 a to 15 d are adjusted in order to adjust the amount of coolant passing through the ion exchangers 15 a to 15 d. Corresponding to each ion exchanger, the first to fourth valves 20a to 20d are provided. Further, the valves 20a to 20d are electrically connected to the control unit 25, and the control unit 25 adjusts the opening and closing of the valves 20a to 20d, thereby controlling the amount of coolant that passes through the ion exchangers 15a to 15d. .
[0027]
Further, on the upstream side of the ion exchange section 15 in the circulation line 5, an electric conductivity meter 27 for detecting the electric conductivity by measuring the electric resistance of the cooling liquid, and a temperature for detecting the temperature of the cooling liquid. Sensor 29. The electrical conductivity meter 27 and the temperature sensor 29 are electrically connected to the control unit 25. Moreover, the result detected by the electrical conductivity meter 27 and the temperature sensor 29 is sent to the control part 25, and the control part 25 controls opening and closing of each valve 20a-20d based on the result.
[0028]
In addition, an electrical conductivity meter 28 for detecting the electrical conductivity by measuring the electrical resistance of the coolant that has passed through each of the ion exchangers 15 a to 15 d is provided on the downstream side of the ion exchange unit 15 in the circulation line 5. . The electrical conductivity meter 28 is electrically connected to the control unit 25. Moreover, the result detected by the electrical conductivity meter 28 is sent to the control part 25, and the control part 25 controls opening and closing of each valve 20a-20d based on the result.
[0029]
Next, control of the valve based on the electrical conductivity of the coolant will be described based on the flowchart of FIG. In addition, the code | symbol corresponding to the whole block diagram shown in FIG. 1 is appended for easy understanding.
[0030]
First, in the coolant circulation system in the initial state, the first to fourth valves 20a to 20d are fully closed by the control unit 25, and the coolant is not circulated.
[0031]
In step S101, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the ion exchanger detected by the electrical conductivity meter 27 is equal to or higher than a predetermined electrical conductivity K. If this determination is affirmed, the process proceeds to step S102. If the determination is negative, the process proceeds to step S104. In step S104, the control unit 25 fully closes the first to fourth valves 20a to 20d (maintains the current state), and returns to step S101.
[0032]
In this way, if the electrical conductivity K1 detected by the electrical conductivity meter 27 is smaller than the predetermined electrical conductivity K, the coolant is within a satisfactory purity range even if the coolant is not subjected to ion exchange treatment. Therefore, all (first to fourth) valves 20a to 20d are closed and the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0033]
Next, in step S102, the control unit 25 calculates the electrical conductivity K1 of the coolant before passing through the ion exchanger and the electrical conductivity K2 of the coolant after passing through the ion exchanger detected by the electrical conductivity meters 27 and 28. In comparison, it is determined whether or not the electrical conductivity K2 is equal to or higher than the electrical conductivity K1. If this determination is affirmed, the process proceeds to step S103, and if the determination is negative, the process proceeds to step S105. In step S105, only the first valve 20a is opened, the second to fourth valves 20b to 20d are closed, and the process returns to step S101. (The first ion exchanger 15a is used.)
[0034]
Next, in step S103, the control unit 25 opens only the second valve 20b, and closes the first, third, and fourth valves 20a, 20c, and 20d (using the second ion exchanger 15b). ), The process is terminated.
[0035]
Thus, the lifetime (remaining capacity) of the ion exchange resin 17 can be determined by comparing the electrical conductivity K1 of the coolant before passing through the ion exchanger and the electrical conductivity K2 of the coolant after passing through the ion exchanger. . That is, when there is a remaining capacity of the ion exchange resin 17, it means that the electrical conductivity K2 is lower than the electrical conductivity K1. This is because the impurities are removed by the ion exchange resin 17. Therefore, if the electrical conductivity K2 is less than the electrical conductivity K1, the remaining capacity of the ion exchange resin 17 can be used and the coolant can be circulated using the first ion exchanger 15a. If the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the ion exchange resin 17 provided inside the first ion exchanger 15a has a lifetime, and is cooled using the second ion exchanger 15b. Circulate the liquid. As described above, the lifetime of the ion exchange resin 17 is determined based on the electric conductivity, and the respective valves are controlled based on the results, and the ion exchangers 15a and 15b are used in turn, so that the ion exchange resin 17 is thermally deteriorated. Therefore, the lifetime of the ion exchange resin 17 can be extended.
[0036]
Moreover, in the said flowchart, although it is description about use of only the 1st and 2nd ion exchangers 15a and 15b shown in FIG. 1, for example, also in the case of the 3rd and 4th ion exchangers 15c and 15d Similarly, the process of step S101 and step S102 is repeated. Specifically, after step S103, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the ion exchanger detected by the electrical conductivity meter 27 is equal to or higher than a predetermined electrical conductivity K. Judging. If the electrical conductivity K1 of the coolant before passing through the ion exchanger is equal to or greater than a predetermined value K, the control unit 25 detects the electricity of the coolant before passing through the ion exchanger detected by the electrical conductivity meters 27 and 28. The conductivity K1 is compared with the electrical conductivity K2 of the coolant after passing through the ion exchanger, and it is determined whether or not the electrical conductivity K2 is equal to or higher than the electrical conductivity K1. As a result of the determination, if the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the control unit 25 opens only the third valve 20c and opens the first, second, and fourth valves 20a, 20b, and 20d. close. (The third ion exchanger 15c is used.)
[0037]
Further, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the ion exchanger detected by the electrical conductivity meter 27 is equal to or higher than a predetermined electrical conductivity K. If the electrical conductivity K1 of the coolant before passing through the ion exchanger is equal to or greater than a predetermined value K, the control unit 25 detects the electricity of the coolant before passing through the ion exchanger detected by the electrical conductivity meters 27 and 28. The conductivity K1 is compared with the electrical conductivity K2 of the coolant after passing through the ion exchanger, and it is determined whether or not the electrical conductivity K2 is equal to or higher than the electrical conductivity K1. If the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the control unit 25 opens only the fourth valve 20d and closes the first to third valves 20a to 20c. (The fourth ion exchanger 15d is used.)
[0038]
Thus, the ion exchange system 2 of the present application is provided inside the ion exchangers 15a to 15d based on values detected by the conductivity meters 27 and 28 provided upstream and downstream of the ion exchangers 15a to 15d. The remaining capacity of the ion exchange resin 17 is determined, and the opening and closing of each valve is controlled by the control unit 25 based on the determination result, and the plurality of ion exchangers 15a to 15d are used in order. Further, when the cooling liquid is kept within a satisfactory purity range without performing the ion exchange treatment, the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0039]
Next, the control of the valve when the ion amount (impurity amount) in the coolant is large will be described based on the flowchart of FIG. In addition, the code | symbol corresponding to the whole block diagram shown in FIG. 1 is appended for easy understanding.
[0040]
First, in step S201, the control unit 25 opens all (first to fourth) valves 20a to 20d.
[0041]
In this way, since the coolant flows to all the ion exchangers 15a to 15d, low pressure loss and high flow rate processing can be performed, and impurities contained in the coolant can be quickly removed.
[0042]
Next, in step S202, the control unit 25 determines whether or not the temperature of the coolant detected by the temperature sensor 29 is equal to or higher than a predetermined temperature T (for example, 60 ° C.). If this determination is affirmed, the process proceeds to step S203. If the determination is negative, the process returns to step S201, and the control unit 25 maintains a state in which all (first to fourth) valves 20a to 20d are opened. .
[0043]
Next, in step S203, the control unit 25 maintains the first valve 20a in an open state, and closes the second to fourth valves 20b to 20d.
[0044]
In this way, at a high temperature (for example, 60 ° C. or higher), the coolant flows only to the first ion exchanger 15a, so the other (second to fourth) ion exchangers 15b to 15d are hot. Avoid contact with the coolant. Thereby, thermal deterioration of the ion exchange resin 17 can be effectively prevented.
[0045]
Next, in step S204, the control unit 25 determines whether or not the electrical conductivity K1 detected by the electrical conductivity meter 27 is equal to or lower than a predetermined electrical conductivity K. If this determination is affirmed, the process proceeds to step S205. If the determination is negative, the process returns to step S204, and the control unit 25 maintains a state in which only the first valve 20a is open.
[0046]
Next, in step S205, the control unit 25 closes all (first to fourth) valves 20a to 20d and ends the process.
[0047]
In this way, when the electrical conductivity is sufficiently lowered, all the (first to fourth) since the cooling liquid is kept within a satisfactory purity range without performing the ion exchange treatment on the cooling liquid. The valves 20a to 20d are closed and the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0048]
Next, the control of the valve based on the temperature of the coolant and the electrical conductivity will be described based on the flowchart of FIG. In addition, the code | symbol corresponding to the whole block diagram shown in FIG. 1 is appended for easy understanding. 4, C1 to C4 indicate the first ion exchanger 15a to the fourth ion exchanger 15d illustrated in FIG. 1, and V1 to V4 illustrated in FIG. 4 indicate the first valves 20a to 20a illustrated in FIG. A fourth valve 20d is shown.
[0049]
First, in the coolant circulation system in the initial state, the coolant is not circulated by the control unit 25 with the first to fourth valves 20a to 20d being fully closed.
[0050]
Next, in step S301, the control unit 25 determines whether or not the temperature of the coolant is lower than 60 ° C. If this determination is affirmed, the process proceeds to step S302, and if not, the process proceeds to S401.
[0051]
Next, in step S302, the control unit 25 determines the ions provided in the first ion exchanger 15a based on the electric conductivity before and after the first ion exchanger 15a detected by the electric conductivity meters 27 and 28. It is determined whether or not the replacement resin has a lifetime. If this determination is affirmed, the process proceeds to step S304. If the determination is negative, the process proceeds to step S303. In step S303, the control unit 25 opens the first valve 20a and proceeds to step S304.
[0052]
Next, in step S304, the control unit 25 determines the ions provided in the second ion exchanger 15b based on the electric conductivity before and after the second ion exchanger 15b detected by the electric conductivity meters 27 and 28. It is determined whether or not the replacement resin 17 has a lifetime. If this determination is affirmed, the process proceeds to step S306. If the determination is negative, the process proceeds to step S305. In step S305, the control unit 25 opens the second valve 20b and proceeds to step S306.
[0053]
Next, in step S306, the control unit 25 determines the ions provided in the third ion exchanger 15c based on the electric conductivity before and after the third ion exchanger 15c detected by the electric conductivity meters 27 and 28. It is determined whether or not the replacement resin 17 has a lifetime. If this determination is affirmed, the process proceeds to step S308. If the determination is negative, the process proceeds to step S307. In step S307, the control unit 25 opens the third valve 20c and proceeds to step S308.
[0054]
Next, in step S308, the control unit 25 determines the ions provided in the fourth ion exchanger 15d based on the electric conductivity before and after the fourth ion exchanger 15d detected by the electric conductivity meters 27 and 28. It is determined whether or not the replacement resin 17 has a lifetime. If this determination is affirmed, the control unit 25 outputs a warning sound for notifying the lifetime of the ion exchanger and ends the process. In addition, after the processing is completed, the ion exchange resin is replaced. If the result in Step S308 is negative, the process proceeds to Step S309. In step S309, the fourth valve 20d is opened, and the process returns to step S301.
[0055]
Thus, when the temperature of the coolant is low (less than 60 ° C.), the coolant is passed through as many ion exchangers as possible. Thereby, since the low pressure loss and the high flow rate processing can be performed, the impurity removal processing in the coolant can be performed quickly.
[0056]
Next, when negative in step S301, in step S401, the control unit 25 determines whether or not the first valve 20a is open. If this determination is affirmed, the process proceeds to step S402, and if not, the process proceeds to step S420.
[0057]
In Step S420, control part 25 judges whether the 2nd valve 20b is opened. If this determination is affirmed, the process proceeds to step S421. If the determination is negative, the process proceeds to step S430. In step S421, the control unit 25 closes the third valve 20c and the fourth valve 20d, and proceeds to step S407.
[0058]
In Step S430, control part 25 judges whether the 3rd valve 20c is opened. If this determination is affirmed, the process proceeds to step S431, and if not, the process proceeds to step S440. In step S431, the control unit 25 closes the fourth valve 20d and proceeds to step S411.
[0059]
In Step S440, control part 25 judges whether the 4th valve 20d is opened. If this determination is affirmed, the process proceeds to step S415. If the determination is negative, the process returns to step S302.
[0060]
Next, in step S402, the control unit 25 closes the second to fourth valves 20b to 20d.
[0061]
As described above, when the temperature of the coolant is high (when it exceeds 60 ° C.), the control unit 25 closes the second to fourth valves 20b to 20d, thereby supplying the coolant to the first ion exchanger. Only 15a is allowed to pass, and is not allowed to pass through the second to fourth ion exchangers 15b to 15d. Thereby, it is possible to prevent the lifetime of all the ion exchange resins from being shortened due to thermal deterioration.
[0062]
Next, in step S403, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the first ion exchanger 15a detected by the electrical conductivity meters 27 and 28 is equal to or higher than a predetermined electrical conductivity K. Determine whether. If this determination is affirmed, the process proceeds to step S404. If the determination is negative, the process is terminated and restarted.
[0063]
In this way, if the electrical conductivity K1 detected by the electrical conductivity meter 27 is smaller than the predetermined electrical conductivity K, the coolant is within a satisfactory purity range even if the coolant is not subjected to ion exchange treatment. The process is terminated because it is held in. When the process is completed, the control unit 25 closes all (first to fourth) valves 20a to 20d to return to the initial state. That is, the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0064]
Next, in step S404, the control unit 25 detects the electrical conductivity K1 of the coolant before passing through the first ion exchanger 15a and the cooling after passing through the first ion exchanger 15a detected by the electrical conductivity meters 27 and 28. The electric conductivity K2 of the liquid is compared to determine whether the value of K1 is equal to or greater than K2. If this determination is affirmed, the process returns to step S403, and if negative, the process proceeds to step S405.
[0065]
Thus, by comparing the electrical conductivity K1 of the coolant before passing through the first ion exchanger 15a and the electrical conductivity K2 of the coolant after passing through the first ion exchanger, the first ion exchanger The lifetime (remaining capacity) of the ion exchange resin 17 provided inside 15a can be determined. That is, when there is a remaining capacity of the ion exchange resin 17, it means that the electrical conductivity K2 is lower than the electrical conductivity K1. This is because the impurities are removed by the ion exchange resin 17.
[0066]
Next, in step S405, the control unit 25 closes the first valve 20a. Here, the ion exchange resin 17 provided in the first ion exchanger 15a may be replaced.
[0067]
Next, in step S406, the control unit 25 opens the second valve 20b.
[0068]
Thus, in step S404, if the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the ion exchange resin 17 provided inside the first ion exchanger 15a has a lifetime, so the control unit 25 can The first valve 20a is closed and the second valve 20b is opened, and the cooling liquid is circulated using the second ion exchanger 15b. Thereby, the use frequency of the ion exchange resin 17 is appropriately reduced, and the lifetime can be extended.
[0069]
Next, in step S407, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the second ion exchanger 15b detected by the electrical conductivity meters 27 and 28 is equal to or higher than a predetermined electrical conductivity K. Determine whether. If this determination is affirmed, the process proceeds to step S408, and if negative, the process is terminated and restarted.
[0070]
In this way, if the electrical conductivity K1 detected by the electrical conductivity meter 27 is smaller than the predetermined electrical conductivity K, the coolant is within a satisfactory purity range even if the coolant is not subjected to ion exchange treatment. The process is terminated because it is held in. When the process is completed, the control unit 25 closes all (first to fourth) valves 20a to 20d to return to the initial state. That is, the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0071]
Next, in step S408, the controller 25 detects the electrical conductivity K1 of the coolant before passing through the second ion exchanger 15b and the cooling after passing through the second ion exchanger 15b, which are detected by the electrical conductivity meters 27 and 28. The electric conductivity K2 of the liquid is compared to determine whether the value of K1 is equal to or greater than K2. If this determination is affirmed, the process returns to step S407, and if negative, the process proceeds to step S409.
[0072]
Thus, by comparing the electrical conductivity K1 of the coolant before passing through the second ion exchanger 15b and the electrical conductivity K2 of the coolant after passing through the second ion exchanger 15b, the second ion exchange is performed. The lifetime (remaining capacity) of the ion exchange resin 17 provided inside the vessel 15b can be determined. That is, when there is a remaining capacity of the ion exchange resin 17, it means that the electrical conductivity K2 is lower than the electrical conductivity K1. This is because the impurities are removed by the ion exchange resin 17.
[0073]
Next, in step S409, the control unit 25 closes the second valve 20b. Here, the ion exchange resin 17 provided in the second ion exchanger 15b may be replaced.
[0074]
Next, in step S410, the control unit 25 opens the third valve 20c.
[0075]
Thus, in step S408, if the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the ion exchange resin 17 provided inside the second ion exchanger 15b has a lifetime, so the control unit 25 The second valve 20b is closed and the third valve 20c is opened, and the coolant is circulated using the third ion exchanger 15c. Thereby, the use frequency of the ion exchange resin 17 is appropriately reduced, and the lifetime can be extended.
[0076]
Next, in step S411, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the third ion exchanger 15c detected by the electrical conductivity meters 27 and 28 is equal to or higher than a predetermined electrical conductivity K. Determine whether. If this determination is affirmed, the process proceeds to step S412. If the determination is negative, the process is terminated and restarted.
[0077]
In this way, if the electrical conductivity K1 detected by the electrical conductivity meter 27 is smaller than the predetermined electrical conductivity K, the coolant is within a satisfactory purity range even if the coolant is not subjected to ion exchange treatment. The process is terminated because it is held in. When the process is completed, the control unit 25 closes all (first to fourth) valves 20a to 20d to return to the initial state. That is, the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0078]
Next, in step S412, the control unit 25 detects the electrical conductivity K1 of the coolant before passing through the third ion exchanger 15c and the cooling after passing through the third ion exchanger 15c detected by the electrical conductivity meters 27 and 28. The electric conductivity K2 of the liquid is compared to determine whether the value of K1 is equal to or greater than K2. If this determination is affirmed, the process returns to step S411. If the determination is negative, the process proceeds to step S413.
[0079]
Thus, by comparing the electrical conductivity K1 of the coolant before passing through the third ion exchanger 15c and the electrical conductivity K2 of the coolant after passing through the third ion exchanger 15c, the third ion exchange is performed. The lifetime (remaining capacity) of the ion exchange resin 17 provided inside the vessel 15c can be determined. That is, when there is a remaining capacity of the ion exchange resin 17, it means that the electrical conductivity K2 is lower than the electrical conductivity K1. This is because the impurities are removed by the ion exchange resin 17.
[0080]
Next, in step S413, the control unit 25 closes the third valve 20c. Here, the ion exchange resin 17 provided in the third ion exchanger 15c may be replaced.
[0081]
Next, in step S414, the control unit 25 opens the fourth valve 20d.
[0082]
Thus, in step S412, if the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the ion exchange resin 17 provided inside the third ion exchanger 15c has a lifetime, so the control unit 25 The third valve 20c is closed and the fourth valve 20d is opened, and the coolant is circulated using the fourth ion exchanger 15d. Thereby, the use frequency of the ion exchange resin 17 is appropriately reduced, and the lifetime can be extended.
[0083]
Next, in step S415, the control unit 25 determines whether or not the electrical conductivity K1 of the coolant before passing through the fourth ion exchanger 15d detected by the electrical conductivity meter 27 is equal to or higher than a predetermined electrical conductivity K. to decide. If this determination is affirmed, the process proceeds to step S416, and if negative, the process is terminated and restarted.
[0084]
In this way, if the electrical conductivity K1 detected by the electrical conductivity meter 27 is smaller than the predetermined electrical conductivity K, the coolant is within a satisfactory purity range even if the coolant is not subjected to ion exchange treatment. The process is terminated because it is held in. When the process is completed, the control unit 25 closes all (first to fourth) valves 20a to 20d to return to the initial state. That is, the ion exchangers 15a to 15d are not used. Thereby, the use frequency of the ion exchange resin 17 is reduced appropriately, and the lifetime can be extended.
[0085]
Next, in step S416, the control unit 25 detects the electric conductivity K1 of the coolant before passing through the fourth ion exchanger 15d and the cooling after passing through the fourth ion exchanger 15d detected by the electric conductivity meters 27 and 28. The electric conductivity K2 of the liquid is compared to determine whether the value of K1 is equal to or greater than K2. If this determination is affirmed, the process returns to step S415. If the determination is negative, the control unit 25 outputs a warning sound for notifying the lifetime of the ion exchangers 15a to 15d, and ends the process. Thereby, the ion exchange resin 17 provided in the fourth ion exchanger 15d is replaced. Here, the ion exchange resin 17 provided in the first to fourth ion exchangers 15a to 15d may be replaced.
[0086]
Thus, by comparing the electrical conductivity K1 of the coolant before passing through the fourth ion exchanger 15d and the electrical conductivity K2 of the coolant after passing through the fourth ion exchanger 15d, the fourth ion exchange The lifetime (remaining capacity) of the ion exchange resin 17 provided inside the vessel 15d can be determined. That is, when there is a remaining capacity of the ion exchange resin 17, it means that the electrical conductivity K2 is lower than the electrical conductivity K1. This is because the impurities are removed by the ion exchange resin 17. Further, if the electrical conductivity K2 is equal to or higher than the electrical conductivity K1, the control unit 25 outputs a warning sound for notifying the lifetime of the fourth ion exchanger 15d because the ion exchange resin 17 has a lifetime.
[0087]
As described above, the ion exchange system 2 of the present application includes the plurality of ion exchangers 15a to 15d arranged in parallel with the coolant circulation system, the temperature sensor 29 for detecting the temperature of the coolant, Electrical conductivity meters 27 and 28 for detecting the electrical conductivity of the coolant disposed upstream and downstream of the plurality of ion exchangers 15a to 15d, and for controlling the passage of the coolant through each ion exchanger A plurality of valves 20a to 20d, and a control unit 25 for controlling the opening and closing of the valves 20a to 20d based on the results detected by the temperature sensor 29 and the electric conductivity meters 27 and 28. Yes. In addition, the control unit 25 performs control to open the predetermined valve and allow the coolant to pass only through the predetermined ion exchanger at high temperatures (when the temperature exceeds 60 ° C.). Moreover, the control part 25 performs control which opens all the valves 20a-20d at the time of low temperature (less than 60 degreeC), and lets a cooling fluid pass to all the ion exchangers 15a-15d.
[0088]
In this way, for example, normally, only when the coolant is passed through all of the plurality of ion exchangers 15a to 15d, low pressure loss and high flow rate processing are performed, and the temperature of the coolant becomes high, The valves 20a to 20d are controlled to allow the coolant to pass through only one of the plurality of ion exchangers 15a to 15d. Thereby, it can prevent that all the ion exchangers 15a-15d (ion exchange resin 17) are thermally deteriorated by being exposed to high temperature for a long time.
[0089]
Further, the control unit 25 may perform control to close all the valves 20a to 20d based on the results detected by the electric conductivity meters 27 and 28.
[0090]
In this way, for example, the lifetime of the ion exchangers 15a to 15d (ion exchange resin 17) and the purity of the circulating coolant can be known from the electrical conductivity, so that the purity of the coolant is within a predetermined range. If inside, all the valves 20a-20d are closed so that the ion exchangers 15a-15d are not used. Thereby, the use frequency of ion exchanger 15a-15d is reduced appropriately, and the lifetime can be extended.
[0091]
Further, the control unit 25 may perform control to open all the valves 20a to 20d based on the results detected by the electric conductivity meters 27 and 28.
[0092]
In this way, for example, when the purity of the coolant exceeds a predetermined range, all the ion exchangers 15a to 15d are used by opening all the valves 20a to 20d, thereby reducing the low pressure loss and the high flow rate. The processing can be performed, and thereby the purity of the cooling liquid can be quickly brought within a predetermined range.
[0093]
Further, the control unit 25 determines the lifetime of the predetermined ion exchangers 15a to 15d (specifically, the ion exchange resin 17) based on the results detected by the electric conductivity meters 27 and 28, and determines other ions. You may make it control to open the valves 20a-20d corresponding to the exchangers 15a-15d.
[0094]
In this way, for example, when the lifetime of the ion exchanger 15a is exhausted, the cooling liquid can be passed through the next (other) ion exchangers 15b to 15d, so that there are a plurality of ion exchangers 15a to 15d. In some cases, ion exchangers 15a-15d can be used in sequence.
[0095]
-Second Embodiment-
Next, an ion exchange system according to a second embodiment of the present invention will be described with reference to FIG. 5 that are the same as those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.
[0096]
FIG. 5 is an overall configuration diagram of the ion exchange system of the present embodiment.
[0097]
As illustrated, the ion exchange system 2A includes an ion exchange unit 15 on a coolant circulation system (hereinafter referred to as “circulation line 51”).
[0098]
The ion exchange unit 15 includes first to fifth ion exchangers 15 a to 15 e each having an ion exchange resin 17 therein. The first to fifth ion exchangers 15 a to 15 e are provided with a plurality of branch circulation lines 52, 52 a,..., 52 d in parallel in the coolant circulation line 51, and are arranged on the branch circulation lines, respectively. Is done. Here, the upstream circulation lines of the ion exchangers 15a to 15e are referred to as primary circulation lines 51a, and the downstream circulation lines of the ion exchangers are referred to as secondary circulation lines 51b. The branch circulation lines 52 to 52d are referred to as first to fifth branch circulation lines 52 to 52d corresponding to the first to fifth ion exchangers 15a to 15e, respectively.
[0099]
In addition, on the primary and secondary circulation lines 51a and 51b and the branch circulation lines 52 to 52d, first to ninth valves 61 to 69 for controlling the passage of the coolant in the ion exchangers 15a to 15e. Is provided.
[0100]
The first to fourth valves 61 to 64 are arranged on the downstream side of the first to fourth ion exchangers 15a to 15d, corresponding to the respective ion exchangers 15a to 15d, to the first to fourth branch circulation lines 52 to 52c. Prepare for the top. The fifth valve 65 is provided between the branch points of the first branch circulation line 52 and the second branch circulation line 52a in the primary circulation line 51a. The sixth valve 66 is provided between the branch points of the third branch circulation line 52b and the fourth branch circulation line 52c in the primary circulation line 51a. The seventh valve 67 is provided between the branch points of the second branch circulation line 52a and the third branch circulation line 52b in the secondary circulation line 51b. Further, the eighth valve 68 is provided in the primary circulation line 51a between the branch points of the fourth branch circulation line 52c and the fifth branch circulation line 52d. The ninth valve 69 is provided between the branch points of the fourth branch circulation line 52c and the fifth branch circulation line 52d in the secondary circulation line 51b.
[0101]
The first to ninth valves 61 to 69 are electrically connected to the control unit 25, and the opening and closing of the valves 61 to 69 is adjusted by the control unit 25, so that the cooling liquid passes through the ion exchangers 15 a to 15 e. Is controlled.
[0102]
Further, on the upstream side of the ion exchange unit 15 in the circulation line 51, an electric conductivity meter 27 for detecting the electric conductivity by measuring the electric resistance of the cooling liquid, and a temperature for detecting the temperature of the cooling liquid. Sensor 29. The electrical conductivity meter 27 and the temperature sensor 29 are electrically connected to the control unit 25. Moreover, the result detected by the electrical conductivity meter 27 and the temperature sensor 29 is sent to the control part 25, and the control part 25 controls opening and closing of each valve 61-69 based on the result.
[0103]
Further, on the downstream side of the ion exchange section 15 in the circulation line 51, an electric conductivity meter for measuring the electric resistance of the coolant that has passed through each of the ion exchangers 15a to 15e and detecting the electric conductivity. 28. The electrical conductivity meter 28 is electrically connected to the control unit 25. Moreover, the result detected by the electrical conductivity meter 28 is sent to the control part 25, and the control part 25 controls opening and closing of each valve 61-69 based on the result.
[0104]
Moreover, this ion exchange system 2A can control the 1st-9th valves 61-69 by the control part 25, and can switch the several ion exchanger 15a-15e to a serial structure or a parallel structure.
[0105]
Specifically, for example, the control unit 25 closes the fifth valve 65, the seventh valve 67, the sixth valve 66, and the ninth valve 69, and other valves (first to fourth valves). By opening 61 to 64 and the eighth valve 68), the first to fifth ion exchangers 15a to 15e can be used as a series structure. Moreover, the 1st-5th ion exchanger 15a-15e can be used as a parallel structure by opening all the (first-9th) valves 61-69 by the control part 25. FIG.
[0106]
As described above, the ion exchange system 2A of the present application includes the ion exchangers 15a to 15e arranged in parallel to the coolant circulation system, the temperature sensor 29 for detecting the coolant temperature, and the ion exchange. Electric conductivity meters 27 and 28 for detecting the electric conductivity of the cooling liquid disposed upstream and downstream of the vessels 15a to 15e, and a plurality for controlling the passage of the cooling liquid through the ion exchangers 15a to 15e. Valves 61 to 69, and a control unit 25 for controlling the opening and closing of the valves 61 to 69 based on the results detected by the temperature sensor 29 and the electric conductivity meters 27, 28. Is arranged so that a plurality of ion exchangers 15a to 15e are arranged in series by opening and closing predetermined valves 65 to 67, 69, and the control unit 25 controls opening and closing of the valves 65 to 67, 69. .
[0107]
In this way, it is possible to easily switch the plurality of ion exchangers 15a to 15e to the serial structure or the parallel structure by controlling each valve. Further, for example, by providing a plurality of ion exchangers 15a to 15e in a series structure, a cooling liquid containing impurities can be passed through the plurality of ion exchangers, so that the impurity removal efficiency can be extremely increased. . Further, for example, by arranging the plurality of ion exchangers 15a to 15e in a parallel structure, low pressure loss of the ion exchanger and high flow rate treatment of the liquid to be processed can be performed, and the ion exchanger can be used efficiently. In addition, a long service life can be realized.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an ion exchange system according to a first embodiment.
FIG. 2 is a flowchart showing valve control based on the electrical conductivity of the coolant in the first embodiment.
FIG. 3 is a flowchart showing valve control when the amount of ions (impurity amount) in the coolant is large in the first embodiment.
FIG. 4 is a flowchart showing valve control based on the coolant temperature and electrical conductivity in the first embodiment.
FIG. 5 is an overall configuration diagram of an ion exchange system according to the present embodiment in a second embodiment.
[Explanation of symbols]
2 Ion exchange system
15a-15d ion exchanger
20 valves
25 Control means (control unit)
27, 28 Electric conductivity detection means (electric conductivity meter)
29 Temperature detection means (temperature sensor)

Claims (7)

An ion exchanger arranged in parallel with the circulation system of the liquid to be treated;
Electrical conductivity detection means for detecting the electrical conductivity of the liquid to be treated;
A plurality of valves for controlling the passage of the liquid to be treated through each ion exchanger;
Control means for controlling opening and closing of each valve based on the result detected by the electrical conductivity detection means;
An ion exchange system comprising: An ion exchanger arranged in parallel with the circulation system of the liquid to be treated;
Temperature detecting means for detecting the temperature of the liquid to be treated;
Electrical conductivity detection means for detecting the electrical conductivity of the liquid to be treated;
A plurality of valves for controlling the passage of the liquid to be treated through each ion exchanger;
Control means for controlling the opening and closing of the valves based on the results detected by the temperature detection means and the electrical conductivity detection means;
An ion exchange system comprising: 3. The ion exchange system according to claim 1, wherein the electrical conductivity detection unit is arranged upstream and downstream of the ion exchanger. The ion exchange system according to claim 1 or 2, wherein the valve is arranged such that the plurality of ion exchangers are arranged in series or in parallel by opening and closing a predetermined valve. 3. The ion exchange system according to claim 2, wherein the control means opens a predetermined valve at a high temperature and allows the liquid to be processed to pass through only a predetermined ion exchanger. 4. The control means determines the life of a predetermined ion exchanger based on the result detected by the electrical conductivity detection means, and opens a valve corresponding to another ion exchanger based on the determination result. The ion exchange system according to claim 1. The ion exchange system according to claim 1, wherein the liquid to be treated is a coolant for a fuel cell and is mounted on a moving body.

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