JPH1034146A - Water treatment apparatus and exchange or regeneration of ion exchange resin column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment apparatus in which resin columns can be exchanged even in plant operation and which is lower in cost and more compact in size as compared with a conventional apparatus. SOLUTION: A main line L which guides water introduced from an inlet line Li and outputs to the pump 3 of a fuel cell power plant through an outlet line Lo, ion exchange resin columns (resin columns) R1-R5 of five stages which are connected in series from the upstream side to the downstream side of the main line L, a conductivity meter 26 which is installed in a line L2 which connects the resin column 4 with the resin column 5 in the resin columns R1 to R5 and detects the conductivity of water which flows from the resin column R4 and passes through the connection line L2, and water is made to bypass the first channel from the inlet line Li in the main line L to the connection line L2 corresponding to conductivity detected by the conductivity meter 26 and to pass through the second channel from the line 2 to the outlet line Lo.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a process for producing high-purity water by treating water supplied to a plant such as a fuel cell power plant, for example, cooling water, by a plurality of ion exchange resin towers. The present invention relates to a water treatment apparatus for supplying the water again to the plant and a method for replacing or regenerating an ion exchange resin tower of the water treatment apparatus.

[0002]

2. Description of the Related Art A fuel cell power plant is a power plant that directly generates electric energy by an electrochemical reaction of hydrogen and oxygen via an electrolyte, and has attracted attention as a high-efficiency power plant with a small effect on the environment. ing. In particular, a phosphoric acid fuel cell power generation plant using phosphoric acid as an electrolyte is at the stage near the practical application, and is being actively developed at present.

[0003] As such a phosphoric acid type fuel cell power generation plant, there are various types of plants from a large power generation capacity type to a small power generation capacity type. Among them, the power generation capacity is 200 kW.
A power generation plant having a relatively small power of about 500 kW (referred to as an on-site fuel cell power generation plant) has been developed. This on-site fuel cell power plant can be realized in a variety of applications, such as an in-house power generation system and a co-generation system, because the plant itself can be realized at a low cost and can be operated at low cost. Research and development for further downsizing, lower cost, and lower running cost are being carried out to further enhance practicality.

[0004] A fuel cell power plant such as an on-site type fuel cell power plant has a fuel cell main body having a fuel electrode, an air electrode, a cooling plate and the like for performing actual power generation, and a fuel cell main body passing cooling water through the cooling plate. And a primary cooling water system for cooling heat generated during power generation. The fuel cell power plant is provided with a water treatment device that supplies high-purity water as cooling water for cooling the fuel cell body.

[0005] That is, the water treatment apparatus is provided with blowdown water (cooling water from which a steam component is separated by a steam separator of a primary cooling water system (battery cooling water system)) after the fuel cell body is cooled. And excess water (condensed water, which contains phosphoric acid, iron rust, etc.) separated by condensing plant exhaust gas (exhaust gas from the air electrode of the fuel cell body) with a condenser To produce high-purity water, and supply the water to the cooling plate again as at least a part of the cooling water.

FIG. 10 shows a fuel cell power generation system 50 having a conventional water treatment apparatus having the above-described functions. FIG.
0, the blowdown water from which the steam component has been separated through the steam separator 52 after the fuel cell main body 51 has been cooled is supplied to the activated carbon tower 5 of the water treatment device 54 via the pump 53.
Sent to 5. The condensed water condensed and separated by the condenser 57 is also sent to the activated carbon tower 55 of the water treatment device 54.

The activated carbon tower 55 of the water treatment apparatus 54 has activated carbon as an adsorbent, and is a substance which cannot be removed from the blowdown water and condensed water (hereinafter referred to as cooling water) by an ion exchange resin, or an ionized resin. Removes substances that interfere with the ion exchange function of the exchange resin. Activated carbon tower 5
The cooling water from which substances and the like that cannot be removed by the ion exchange resin by 5 are removed and sent to the ion exchange unit 56.

[0008] The ion exchange section 56 includes two ion exchange lines 57 (main lines 57M, 57M, 57A) in which a plurality of stages of ion exchange resin towers (hereinafter simply referred to as resin towers) corresponding to ions dissolved in the cooling water are connected in series. Sub-series 57S).

That is, the cooling water sent from the activated carbon tower 55 flows into the main line 57M of the ion exchange line 57 connected in parallel through the ion exchange line inlet 57a, and the resin towers of the main line 57M Ions dissolved in the cooling water passing through R11 to R15 in order are removed to become high-purity water. And the cooling water that became high purity water,
It is sent again to the fuel cell body 51 via the ion exchange line outlet 57b and the pump 58, and is used for cooling the fuel cell body 51.

[0010] Incidentally, the ion exchange system 57M (each of the resin towers R11 to R15) reaches the end of its life as it is repeatedly used, so it is periodically replaced or regenerated every several months, not only when the plant is stopped or in operation. There is a need to. There are several methods for this exchange, and the ion exchange section 57 shown in FIG.
Is composed of two lines (a main line 57M and a sub line 57S), which represents an example of the above-described ion exchange line exchange or regeneration system.

That is, when an ion break (reaching a breakthrough point, that is, breakthrough) occurs at the exit of the resin tower R15 at the last stage of the main line 57M, this ion break state is set at the ion exchange line outlet 57b. Are detected by the detected conductivity sensor 59, and are installed in the inlet line LM1 of the resin tower R11 in the first stage of the main series and the outlet line LM2 of the resin tower R15 in the last stage of the main series by a valve operation control unit (not shown) according to the detection signal. The shut-off valves 59a and 59b are automatically closed.
Subsequently, the inlet line LS1 of the first-stage resin tower R11 'of the sub-series 57S and the last-stage resin tower R1 of the sub-series 57S.
Shut-off valves 60 respectively installed at the 5 'outlet line LS2
By automatically opening a and 60b, the ion exchange system that actually operates is switched from the main system 57M to the sub system 57S. Therefore, even during the operation of the plant, the water treatment of the cooling water is performed in the sub-system 57.
S, the resin towers R11 to R15 of the main line 57M can be exchanged or regenerated without stopping the plant operation. This can be done before R15 'breaks through.

As another ion exchange series exchange or regeneration method based on the configuration shown in FIG. 10, a manual method can be considered. That is, when the inspector periodically measures the conductivity of the exit of the resin tower 14 one stage before the resin tower 15 at the last stage of the main series 57M and recognizes the breakthrough state as a result of the measurement, Each of the shutoff valves 59a, 5 of the series 57M
9b is manually closed, and each shutoff valve 6 of the sub-series 57S is closed.
Open 0a and 60b. As a result, the working ion exchange system can be switched from the main system 57M to the sub system 57S, and the resin towers R11 to R15 of the main system M can be exchanged or regenerated. In addition, the inspector recognizes the resin tower R15 at the last stage of the main line 57M from the point when the breakthrough actually occurs, and changes the flow path of the cooling water to the main line 57M.
It has a backup function for maintaining water quality during the time from M to switching to the sub-series 57S.

On the other hand, as another ion exchange series exchange or regeneration system, there is a temporary resin tower installation system. That is,
A temporary resin tower is installed when the breakthrough of the resin tower outlet just before the last stage of the main series is found, and the flow path of the cooling water is temporarily switched to the temporary resin tower. Then, the resin tower that has broken through while the flow path is switched is replaced or regenerated. In addition, in the case of this temporary resin tower installation system, it is also possible to arrange the last resin tower which has not yet passed through at the time of resin tower replacement or regeneration and arrange it in the first stage as it is and use it again.

[0014]

In order to spread fuel cell power plants widely, it is required to improve not only the power generation performance but also the practicality. In particular, in order to further enhance the practicality of the on-site type fuel cell power plant, it is indispensable to maximize the compactness.

However, in an on-site fuel cell power plant equipped with a conventional two-exchange water treatment system of two ion exchange systems 57M and 57S, the water treatment system is provided with two ion exchange systems 57M and 57S. Since the size is increased, the demand for compactness described above is hindered, and this is one factor that deteriorates practicality.

On the other hand, in an on-site type fuel cell power plant equipped with a temporary installation type water treatment apparatus, a temporary resin tower and valves and valve seats required for switching the temporary resin tower are always prepared. It must be stored, and extra cost is required for storing the temporary resin tower and the like. In addition, it takes extra time to install a temporary resin tower, etc.
Increased human costs.

Furthermore, even if a temporary resin tower is used repeatedly, it will eventually break down, and the stored resin tower will also gradually degrade the performance of its ion exchange resin. When actually used, there is a possibility that the plant cannot be used due to breakdown or performance deterioration, and a situation occurs in which the plant operation must be stopped at the time of replacement or regeneration of the ion exchange series, and there is a risk that the plant operation efficiency will be deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a water treatment apparatus that can replace a resin tower even during operation of a plant, and that is lower in cost and more compact than before. I do.

Another object of the present invention is to provide a method for replacing or regenerating an ion-exchange resin tower, which allows the resin tower to be replaced even during the operation of the plant, and realizes a lower cost and more compact water treatment apparatus than before. For other purposes.

[0020]

According to a first aspect of the present invention, there is provided a water treatment apparatus for removing impurities such as ions from water supplied to a plant to produce high-purity water. In a water treatment apparatus for supplying the water again to the plant as the water supply, the water treatment device has an inlet line and an outlet line, and guides the water supplied from the inlet line to output the water to the plant via the outlet line. A plurality of ion exchange resin towers connected in series from the upstream side to the downstream side in the middle of the main line to remove the impurities contained in the feedwater flowing through the main line; and From the upstream side of the ion-exchange resin tower of the predetermined stage, and the next-stage ion-exchange resin positioned downstream with respect to the predetermined-stage ion-exchange resin tower A conductivity detecting means for detecting the conductivity of feed water flowing out of the ion-exchange resin tower at the predetermined stage and flowing through the connection line, and a conductivity value detected by the conductivity detecting means. Accordingly, a first flow path from the inlet line to the connection line in the main line is bypassed and a second flow path from the connection line to the outlet line in the main line is bypassed.
And a bypass means for passing the feed water through the first flow path while passing the feed water through the flow path at a predetermined timing while bypassing the second flow path at a predetermined timing.

According to the water treatment apparatus described in claim 2,
The next-stage ion-exchange resin tower is the last-stage ion-exchange resin tower located on the most downstream side of the plurality of ion-exchange resin towers.

According to the water treatment apparatus described in claim 3,
The plant is a fuel cell power plant, and the feedwater is composed of cooling water used for cooling the fuel cell body and condensed water obtained by condensing exhaust gas discharged by power generation of the fuel cell body. I have.

According to the water treatment apparatus described in claim 4,
A second connection line for connecting a first-stage ion exchange resin tower on the most upstream side in the plurality of ion-exchange resin towers and a next-stage ion exchange resin tower positioned downstream with respect to the first-stage ion exchange resin tower; A second conductivity detection means for detecting the conductivity of the feedwater flowing out of the first-stage ion-exchange resin tower flowing out of the first-stage ion-exchange resin tower, wherein the bypass means is provided with respect to the first-stage ion-exchange resin tower. A first on-off valve for flow control provided in the upstream inlet line,
An openable and closable first bypass flow path connecting an inlet line on the upstream side to the first on-off valve and the connection line, and a first bypass flow path connected to the first bypass flow path in the connection line. A second on-off valve and a third on-off valve for flow control provided respectively on the upstream side and the downstream side of the confluence point, and a first junction where the first bypass flow path is connected in the connection line A second on-off valve and a third on-off valve for flow control provided respectively on the upstream side and the downstream side of the point, and a flow provided on an outlet line on the downstream side with respect to the ion-exchange resin tower in the final stage. A fourth on-off valve for control, an outlet line downstream of the fourth on-off valve,
Openable and closable second bypass flow path for connecting the second connection line, and provided on the upstream side and downstream side of a second junction where the second bypass flow path is connected in the second connection line. The fifth on-off valve and the sixth
Opening / closing valve, and an openable / closable third bypass connecting an inlet line upstream of the first opening / closing valve with an outlet line between the fourth opening / closing valve and the last-stage ion exchange resin tower. A fourth bypass flow path that can be opened and closed connecting a flow path, an outlet line downstream of the fourth open / close valve, and an inlet line between the first open / close valve and the first-stage ion exchange resin tower; And

According to the water treatment apparatus described in claim 5,
The bypass means closes only the first and fifth on-off valves among the first to sixth on-off valves according to the conductivity value detected by the conductivity detection means, and And only the first bypass flow path among the four bypass flow paths is opened, and the feedwater is passed through the first bypass flow path to the last-stage ion-exchange resin tower to perform the last-stage ion exchange. Replacing or regenerating an ion-exchange resin tower other than the resin tower, opening the fifth on-off valve to close the fourth and sixth on-off valves at a required timing after completion of the exchange or regeneration, and By opening the bypass flow path, the feed water is passed through the first bypass flow path and the fourth bypass flow path to an exchanged or regenerated ion exchange resin tower other than the last-stage ion exchange resin tower. I try to make it.

According to the water treatment apparatus described in claim 6,
The bypass means may include a first flow control first flow control line provided on an upstream inlet line with respect to the first stage ion exchange resin tower.
An on-off valve, a second on-off valve for flow control provided in a line on the downstream side with respect to the first-stage ion exchange resin tower,
An openable and closable first bypass flow path connecting an inlet line on the upstream side to the first on-off valve and the connection line, and a first bypass flow path connected to the first bypass flow path in the connection line. A third on-off valve and a fourth on-off valve for flow control respectively provided on the upstream side and the downstream side of the confluence point, and a second confluence in which the first bypass flow path is connected at the inlet line. An openable and closable third bypass flow path connecting a point and a line on the downstream side of the second on-off valve;
A fifth on-off valve for flow control provided on an outlet line on the downstream side with respect to the ion-exchange resin tower of the last stage, and a fifth on-off valve with respect to the first junction and the fifth on-off valve. An openable and closable fourth bypass flow path for connecting to an outlet line.

According to the water treatment apparatus described in claim 7,
The bypass means may include a first flow control first flow control line provided on an upstream inlet line with respect to the first stage ion exchange resin tower.
An on-off valve, an openable and closable first bypass flow path connecting an upstream inlet line to the first on-off valve and a downstream line to the first-stage ion exchange resin tower, Flow control second on-off valves provided upstream and downstream of a first junction where the first bypass flow path is connected in a line downstream of the first stage ion exchange resin tower, respectively. And a third on-off valve, a second openable / closable bypass passage connecting the first junction and the connection line, and a second bypass passage connected to the second bypass flow passage in the connection line. A fourth on-off valve and a fifth on-off valve for flow control respectively provided on the upstream side and the downstream side of the confluence point, and an outlet line on the downstream side with respect to the final-stage ion exchange resin tower. A sixth on-off valve for flow control and the second confluence And a third bypass passage openable and closable to connect the downstream side of the outlet line to the sixth on-off valve and.

According to the water treatment apparatus described in claim 8,
The bypass means may include a first flow control first flow control line provided on an upstream inlet line with respect to the first stage ion exchange resin tower.
Opening / closing valve, an openable / closable first bypass flow path connecting an inlet line on the upstream side with respect to the first opening / closing valve, and the connection line, and the first bypass flow path in the connection line A second on-off valve and a third on-off valve for flow control provided respectively on the upstream side and on the downstream side of the connected first junction, and a downstream side with respect to the ion-exchange resin tower in the final stage. A fourth on-off valve for flow control provided in the outlet line, and a second openable / closable bypass flow connecting the first junction and an outlet line downstream of the fourth on-off valve; And road.

According to another aspect of the present invention, there is provided a method for replacing or regenerating an ion-exchange resin tower having an inlet line and an outlet line for guiding water supplied from the inlet line to an outlet. A main line that outputs to the plant via a line, and a plurality of stages connected in series from the upstream side to the downstream side in the middle of the main line to remove the impurities contained in the feedwater flowing through the main line. In the method of replacing or regenerating an ion-exchange resin tower in a water treatment apparatus that supplies high-purity water from which the impurities have been removed by the multiple-stage ion-exchange resin tower to the plant as the feedwater, comprising: The conductivity of the feedwater flowing out of the ion-exchange resin tower at a predetermined stage from the upstream side of the plurality of ion-exchange resin towers and flowing through the line. In accordance with the detected conductivity value, the first flow path from the connection line to the outlet line in the main line is bypassed by bypassing the first flow path from the entrance line to the connection line in the main line. The feed water is passed through only the second flow path to replace or regenerate ion exchange resin towers other than the last-stage ion exchange resin tower, and the first flow path is bypassed at a predetermined timing to bypass the second flow path. The above-mentioned water supply is made to flow only through the flow path.

[0029] In the water treatment apparatus according to any one of the first to ninth aspects, the water supplied from the inlet line of the main line is:
After impurities contained in the feed water have been removed through a plurality of stages of ion exchange resin towers connected in series from the upstream side to the downstream side in the middle of the main line, a fuel cell power plant, etc. Is output to the plant.

The ion-exchange resin tower of a predetermined stage from the upstream side of the plurality of ion-exchange resin towers and the ion-exchange resin of the next stage positioned downstream with respect to the ion-exchange resin tower of the predetermined stage Tower (for example, ion-exchange resin tower at the last stage)
The conductivity of the feedwater flowing out of the ion-exchange resin tower at a predetermined stage and flowing through the connection line is detected by conductivity detection means provided on the line connecting the two.

At this time, if the detected conductivity value is a conductivity value based on the breakthrough state of the ion exchange resin tower up to the predetermined stage, the final stage of the next stage of the ion exchange resin tower at the predetermined stage is performed. Since ion activity still remains in the ion-exchange resin tower at the stage, the ion-exchange resin tower is replaced or regenerated while continuing to supply water using the ion-exchange resin tower at the last stage. That is, the first flow path from the inlet line to the connection line in the main line is bypassed by the bypass means, and the water supply is supplied to the second flow path from the connection line to the outlet line in the main line. Water is passed. As a result, since water is supplied only to the last-stage ion-exchange resin tower located in the second flow path from the connection line to the outlet line, it is possible to replace or regenerate the ion-exchange resin tower that has broken through during this time. it can. The bypass means bypasses the second flow path at a predetermined timing (for example, the timing at which the exchange or regeneration of the ion-exchange resin tower that has passed through is completed), and the feed water flows through the first flow path. Is done. That is, since the feedwater flows through the exchanged or regenerated ion-exchange resin tower located in the first flow path, the ion-exchange resin tower in the final stage is exchanged or generated, for example, or the flow direction is changed during this time. It can be used as a first stage ion exchange resin tower.

As described above, the ion exchange resin tower can be replaced or regenerated without stopping the supply of the water supply to the plant.

In particular, according to the water treatment apparatus described in claim 4 or 5, the first on-off valve and the second on-off valve according to the conductivity value detected by the conductivity detection means by the bypass means. Only the first bypass flow path among the first to fourth bypass flow paths, that is, the first connection path connecting the upstream inlet line to the first on-off valve and the connection line. Is opened, the feedwater flowing from the inlet line is supplied to the ion-exchange resin tower at the final stage through the first bypass channel and the connection line (opening / closing valve 3). After the impurities are removed by the ion-exchange resin tower, the water is supplied to the plant via an outlet line (open / close valve 4).

That is, since the feedwater is treated by the ion-exchange resin tower at the final stage, the purity of the feedwater can be maintained, and during this time, ion-exchange resin towers other than the ion-exchange resin tower at the final stage are exchanged. Or reproduced. Then, at a required timing after completion of the replacement or regeneration, the bypass means opens the second on-off valve, closes the third and fourth on-off valves, and opens the fourth bypass flow path. As a result, the water supplied from the inlet line is supplied to the newly exchanged or regenerated ion exchange resin tower via the first bypass flow path and the connection line (open / close valve 2), and the ion exchange resin in the final stage After the impurities are removed by the resin tower, it is supplied to the plant via the fourth bypass flow path and the outlet line (open / close valve 4).

At this time, for example, after reversing the direction of the ion-exchange resin tower in the last stage, the on-off valve 3 is opened and the first
By closing the bypass flow path and opening the third bypass flow path,
The feedwater that has flowed in from the inlet line flows through the third bypass flow path to the ion-exchange resin tower at the final stage, and then is supplied to another exchanged or regenerated ion-exchange resin tower, and then the fourth bypass is used. It is supplied to the plant via a flow path and an outlet line (open / close valve 4). That is, the ion-exchange resin tower at the last stage can be reused.

According to the water treatment apparatus described in claim 6,
Water can be supplied to the ion-exchange resin tower at the final stage through the first bypass flow passage to exchange or regenerate other resin towers. Further, thereafter, the exchanged or regenerated first-stage ion-exchange resin tower is isolated by the first on-off valve and the second on-off valve, and the last-stage ion-exchange resin tower is subjected to the fourth on-off valve and the fifth on-off valve. Separated by a valve, the feedwater is passed through the second and third bypass passages and other newly exchanged or regenerated resin towers to provide newly exchanged or regenerated first stage ions The positions of the exchange resin tower and the last ion exchange resin tower can be exchanged, and the last ion exchange resin tower can be reused.

According to the water treatment apparatus described in claim 7,
Feed water is supplied to the first-stage ion-exchange resin tower and the last-stage ion-exchange resin tower through the second bypass flow path, and the ion-exchange resin towers other than the first-stage and last-stage ion-exchange resin towers are exchanged. The resin tower can be replaced or regenerated. Then, the first stage ion-exchange resin tower is isolated by the first on-off valve and the second on-off valve, and the last-stage ion exchange resin tower is isolated by the fifth on-off valve and the sixth on-off valve to supply water. The first-stage ion exchange resin tower is exchanged or regenerated by flowing through the first and third bypass flow paths and other newly exchanged or regenerated resin towers, and the first-stage ion exchange resin exchanged or regenerated. The positions of the tower and the last-stage ion-exchange resin tower can be exchanged, and the last-stage ion-exchange resin tower can be reused.

According to the water treatment apparatus described in claim 8,
The feedwater can be passed through the first-stage ion-exchange resin tower through the first bypass flow path to exchange or regenerate ion-exchange resin towers other than the last-stage ion-exchange resin tower. Then, the final stage ion-exchange resin tower is isolated by the third on-off valve and the fourth on-off valve, and the feedwater flows through the second bypass flow path and another newly exchanged or regenerated resin tower. Thereby, the ion-exchange resin tower at the last stage can be exchanged or regenerated.

[0039]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 shows a schematic configuration of a fuel cell power plant using the water treatment apparatus of the present embodiment.

According to FIG. 1, the fuel cell power plant 1
Is provided with a phosphoric acid type fuel cell main body 2 using, for example, a phosphoric acid aqueous solution as an electrolyte. The fuel cell main body 2 includes a fuel electrode, an air electrode facing the fuel electrode and an electrolyte layer (phosphoric acid aqueous solution layer), and a cooling plate. The hydrogen gas supplied to the fuel electrode is provided. And an oxygen ion based on oxygen in the air supplied to the air electrode is subjected to an electrochemical reaction to generate DC electric energy between the two electrodes.

The fuel cell power plant 1 has a pump 3 for sending out cooling water and supplying it to the cooling plate of the fuel cell body 2.
And a steam separator 4 that is supplied to the fuel cell body 2 to cool the fuel cell body 2 and separate a steam component from the heated cooling water, and a cooling water (blowdown water) from which the steam component is separated. Condensation for condensing exhaust air (exhaust gas) sent from the pump 5 to be sent out and the air electrode of the fuel cell body 2 to separate excess moisture (condensed water; which contains phosphoric acid, iron rust, etc.) And the condensed water separated by the condenser 5 and the blowdown water sent out by the pump 5 are purified to produce high-purity water. A water treatment device 7 for supplying the cooling plate of the battery body 2 again.

The water treatment apparatus 7 includes an activated carbon tower 8 and an ion exchange section 9 as shown in FIG. Activated carbon tower 8
Has activated carbon as an adsorbent and removes substances that cannot be removed by the ion exchange resin from the blowdown water and condensed water (cooling water) sent, or substances that impair the ion exchange function of the ion exchange resin. The cooling water after the removal is sent to the ion exchange section 9.

The ion exchange section 9 guides the cooling water sent from the activated carbon tower 8 to supply the cooling water to the pump 3.
have. The main line L has an inlet line Li and an outlet line Lo connected to an output line of the activated carbon tower 8 and an input line of the pump 3 via a switch (not shown).
And The inlet line Li is initially connected to the output line of the activated carbon tower 8, and the outlet line Lo is connected to the input line of the pump 3. By operating the switch, the inlet line Li is connected to the input line of the pump 3. It is also possible to switch the outlet line Lo to the output line of the activated carbon tower 8.

The ion exchange section 9 includes a plurality of (five) ion exchange resin towers (hereinafter simply referred to as resin towers) R1 to R5 as a single ion exchange system. The resin towers R1 to R5 are sequentially provided in series in the middle of the main line L. Then, the plurality of resin towers R1 to R1
R5 are the first resin tower R1 and the second resin tower R, respectively, in order from the upstream side (inlet line Li side) of the main line L.
It is configured as a two- or three-stage resin tower R3, a four-stage resin tower R4, and a final-stage resin tower R5.

Each of the resin towers R1 to R5 is detachably connected to the main line L and can be replaced or regenerated. The direction of the two-dot chain line arrow beside each of the resin towers R1 to R5 indicates the direction in which cooling water is initially passed in the resin towers R1 to R5.

The first-stage resin tower R1 in the main line L
An opening / closing valve 10 is provided in the inlet line Li on the upstream side, and two opening / closing valves are provided in a line L1 connecting the first-stage resin tower R1 and the second-stage resin tower R2 in the main line L. 11 and 12 are sequentially provided in series.
Further, a line L2 connecting the four-stage resin tower R4 and the last-stage resin tower R5 in the main line L is provided with two on-off valves 13 and 14 in series in order. An on-off valve 15 is provided at an outlet line Lo on the downstream side of the resin tower R5 of the stage.

That is, an on-off valve 10 and an on-off valve 11 are provided on the upstream side and the downstream side of the first-stage resin tower R1, respectively. The resin tower R1 can be isolated from the cooling water flow path. Similarly, the on-off valve 14 and the on-off valve 1 are located upstream and downstream of the resin tower R5 in the final stage.
5 are provided, and the on-off valve 14 and the on-off valve 15 are respectively operated so that the resin tower R5 at the final stage can be isolated from the cooling water flow path.

A bypass line B1 is provided for connecting the point S1 on the inlet line Li on the upstream side to the on-off valve 10 with the point S2 on the line L2 connecting the on-off valves 13 and 14. An on-off valve 20 is provided in the middle of the bypass line B1. Also, the on-off valve 11
And a bypass line B2 connecting a point S3 on the line L1 connecting the on-off valve 12 and a point S4 on the outlet line Lo on the downstream side with respect to the on-off valve 15 is provided. Is provided with an on-off valve 21.

Further, an outlet line L between the point S1 on the inlet line Li and the last-stage resin tower R5 and the on-off valve 15 is provided.
0 is provided with a bypass line B3 connecting the upper point S5 and an on-off valve 2 in the middle of the bypass line B3.
2 are provided. In addition, a bypass line B4 connecting a point S6 on the inlet line Li connecting the on-off valve 10 and the first stage resin tower R1 and a point S3 on the outlet line L0 is provided, and in the middle of the bypass line B4. Is provided with an on-off valve 23. The points S1 to S6 where the bypass lines B1 to B4 branch or merge are referred to as branch points (or merge points), respectively.

On the other hand, at a branch point S4 on the line L1, a conductivity meter (conductivity sensor) 25 for detecting the conductivity of the cooling water flowing through the line L1 is installed. Also, a conductivity meter 26 for detecting the conductivity of the cooling water flowing through the line L2 is provided.

The aforementioned main line L (entrance line Li
, Line L1, line L2, outlet line Lo), and bypass lines B1 to B4 are each formed of a flexible tube. In addition, each on-off valve 10-15
And 20 to 23, and the above-described branch points S1 to S6
Is supported by a support member such as a support base or a support rod, and its position is fixed.

Next, the operation of the present configuration will be described focusing on the operation when the resin towers R1 to R5 of the ion exchange section 9 are exchanged (or regenerated). In the following description, a case where each of the resin towers R1 to R5 is replaced will be described.

At the time of the initial operation of the water treatment apparatus 7, the on-off valve 2 provided in the middle of each of the bypass lines B1 to B4 is provided.
The valves 0 to 23 are closed, and the on-off valves 10 to 15 provided in the middle of the inlet line Li, the line L1, the line L2, and the outlet line Lo of the main line L are opened.

At this time, the activated carbon tower 8 is moved from the ion exchange section 9
Is sent to the inlet line Li and the on-off valve 1
0, flows into the first-stage resin tower R1, and after the ions dissolved in the cooling water are removed, the two-stage resin tower R2 and the three-stage resin tower are passed through the line L1 and the on-off valves 11, 12. R
The ions sequentially flow into the third and fourth resin towers R4, and the ions dissolved in the cooling water are further removed.

The cooling water flowing out of the four-stage resin tower R4 flows into the last-stage resin tower R5 via the line L2 and the on-off valves 13 and 14, and is subjected to final ion removal, thereby obtaining very high purity. Cooling water is generated. This high-purity cooling water
It is sent to the pump 3 via the outlet line Lo and the opening / closing valve 15, and is sent to the cooling plate of the fuel cell main body 2 by the output of the pump 3 to be used for cooling the fuel cell main body 2.

As described above, when the fuel cell power plant 1 continues to operate and the high-purity cooling water generating process is continuously performed in the water treatment device 7, the resin towers R1 to R5 are moved from the cooling water inflow side thereof. It gradually deteriorates.

When breakthrough (ion break) occurs in the first to fourth resin towers R1 to R4, the breakthrough state is detected by the conductivity meter 26 based on the cooling water flowing through the line L2. .

At this time, the inspector responds to the detection signal from the conductivity meter 26 to open and close the on-off valve 20 of the bypass line B1.
Is opened, and the on-off valves 10 and 13 are closed. As a result, the cooling water sent from the activated carbon tower 8 is changed from the inlet line Li to the bypass line B1 as shown by the dashed line in FIG.
(Open / close valve 20) → line L2 (open / close valve 14) → resin tower R
5 → the outlet line Lo (opening / closing valve 15) flows sequentially and is sent to the pump 3 (in FIG. 3, the closed opening / closing valve is shown in black). That is, in the state where the four-stage resin tower R4 breaks through, although the resin in the cooling water inflow side portion is used in the final-stage resin tower R5, the ion activity still remains and the resin tower R5 is in a state where it can be sufficiently used. By bypassing the resin towers R1 to R4 and flowing cooling water through the final stage resin tower R5 by the bypass line B1,
The resin towers R1 to R4 can be exchanged while maintaining the quality of the cooling water.

That is, while the cooling water is flowing through the above-described path, the inspector checks the first-stage resin tower R1 to the fourth-stage resin tower R4.
Are replaced with new resin towers R1 'to R4', respectively. At this time, each of the resin towers R1 'to R4' is connected to the main line L in a direction opposite to the resin towers R1 to R4 before replacement, or the main line L for each of the resin towers R1 'to R4' is connected. The connection relationship between the inlet and outlet is determined by the resin tower R1.
To R4, etc., so that each of the resin towers R1 ′ to R4 ′
The direction in which the cooling water is passed through is set opposite to the direction of the resin towers R1 to R4 (note that the direction in which the cooling water is passed is shown by a two-dot chain line in FIG. 4).

Then, the examiner opens the on-off valves 23 and 13 of the bypass line B4 and closes the on-off valves 14 and 15. As a result, the cooling water sent from the activated carbon tower 8 is supplied to the inlet line Li as shown by the dashed line in FIG.
→ bypass line B1 (opening / closing valve 20) → line L2 (opening / closing valve 13) → resin towers R4 ′ to R2 ′ → line L1 (opening / closing valves 12 and 11) → resin tower R1 ′ → inlet line L
i → bypass line B4 (open / close valve 23) → outlet line L
and flows sequentially to the pump 3. That is, in the state of FIG. 5, the resin tower R5 at the final stage is isolated (bypassed) by the on-off valve 14 and the on-off valve 15, and the cooling water flows through the newly exchanged resin towers R4 'to R1'. Because
Cooling water quality is maintained.

Finally, the inspector puts the resin tower R5 of the last stage into
After the cooling water is re-installed so that the flow direction of the cooling water is opposite to the direction shown by the two-dot chain line in FIG. 5 (the direction on the on-off valve 15 side) (the direction on the on-off valve 14 side), the bypass line B3 is opened and closed. The valve 22 and the on-off valve 14 are opened, and the on-off valve 20 of the bypass line B1 is closed. As a result, the cooling water sent from the activated carbon tower 8 is supplied to the inlet line L as shown by the dashed line in FIG.
i Bypass line B3 (open / close valve 22) → outlet line Lo
→ Resin tower R5 → Line L2 (open / close valve 14 and open / close valve 1)
3) → resin tower R4 ′ to R2 ′ → line L1 (open / close valve 12)
And the on-off valve 11) → the resin tower R1 ′ → the inlet line Li → the bypass line B4 (the on-off valve 23) → the outlet line Lo. That is, the cooling water can be processed through all the resin towers R1 'to R4' and R5 on the main line L to generate high-purity cooling water.

The direction of the cooling water flowing through the main line L is opposite to the direction of the first (before replacement) cooling water after flowing through the bypass line B3 and before flowing through the bypass line L4. . That is, the cooling water is supplied from the resin tower R5, which is the final stage, from the initial exit side of the resin tower R5.
5, flows through R4 'to R2', and finally flows into the resin tower R1 ', which was the first stage, to be subjected to ion removal. Therefore, the resin tower R5 which still has activity can be used as the first-stage resin tower, and the resin tower can be used without waste.

When the cooling water generation process is continuously performed in the state shown in FIG. 6, breakthrough occurs from the resin tower R5, which is now the first stage. That is, the inspector detects the breakthrough state with the conductivity meter 25, and the entrance line Li in FIGS.
Is regarded as an outlet line, and the outlet line Lo is regarded as an inlet line, and operations substantially symmetric to those in FIGS. 3 to 6 are performed to exchange each resin tower.

That is, the inspector operates a switch (not shown) to switch the inlet line Li to the input line of the pump 3 and the outlet line Lo to the output line of the activated carbon tower 8.
Then, the on-off valve 21 and the on-off valve 1 of the bypass line B2
Open 0, open / close valve 12, open / close valve 2 of bypass line B3
2 and the on-off valve 22 of the bypass line B3 are closed. At this time, the cooling water flows from the outlet line Lo → the bypass line B2 (opening / closing valve 21) → the line L1 (opening / closing valve 11) → R1 ′ → inlet symmetrically with the flow in FIG. The water flows sequentially through the line Li (open / close valve 10) and is sent to the pump 3.

Similarly, the inspector replaces the resin towers R2 'to R5 with new resin towers R2''toR5', respectively.
(Reverse direction to FIG. 4 and same direction as FIG. 2)
The on-off valves 22 and 12 of the bypass line B3 are opened, and the on-off valves 11 and 10 are closed. As a result, the cooling water flows out of the outlet line Lo → bypass line B2 (opening / closing valve 21) → line L1 (opening / closing valve 12) → resin towers R2 ″ to R
4 '' → line L2 (on-off valve 13 and on-off valve 14) → resin tower R5 ′ → outlet line Lo → bypass line B3 (on-off valve 22) → inlet line Li and sequentially sent to pump 3.

Then, after re-installing the resin tower R1 'in the opposite direction, the inspector opens the on-off valves 23 and 11 of the bypass line B4 and closes the on-off valve 21 of the bypass line B2. As a result, the cooling water is discharged from the outlet line Lo → the bypass line B4 (open / close valve 23) → the inlet line L1 → the resin tower R1 ′ (the activity remains) → the line L1 (open / close valve 1).
1 and open / close valve 12) → resin tower R2 ″ to R4 ″ → line L
2 (on-off valve 13 and on-off valve 14) → resin tower R5 ′ → outlet line Lo → bypass line B3 (on / off valve 22) → inlet line Li and sequentially sent to pump 3.

By sequentially repeating the above operation in accordance with the detection signals of the conductivity meters 25 and 26, the water treatment apparatus can be operated while exchanging the resin towers R1 to R5 without stopping the plant operation. it can.

In the present configuration, since the resin towers R1 to R5 can be exchanged using a single ion exchange system during the operation of the plant, the size of the resin towers is extremely small as compared with the conventional water treatment apparatus. And a low-cost water treatment apparatus can be realized. Moreover, since a temporary resin tower or the like is not used,
There is no need to worry about deteriorating plant operation efficiency, and reliability has also improved.

Also, in this configuration, the resin tower in which the activity remains is utilized without waste (the frequency of replacement of the resin tower R1 and the resin tower R5 is reduced as compared with other resin towers).
The resin tower can be exchanged efficiently, and the cost can be reduced accordingly.

As described above, in the present configuration, the resin tower R5 having the remaining activity is used as the first-stage resin tower. However, the resin tower R5 may be simply replaced or regenerated with a new resin tower R5 '.

(Second Embodiment) FIG. 7 shows a schematic configuration of an ion exchange section of a water treatment apparatus applied to a fuel cell power plant according to this embodiment. The configuration of the water treatment device other than the ion exchange unit and the configuration of the fuel cell power plant are as follows:
The description is omitted because it is almost the same as the first embodiment.
Further, the same components as those in the first embodiment in the ion exchange unit are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted or simplified.

According to FIG. 7, the bypass line B2 (opening / closing valve 21), bypass line B3 (opening / closing valve 22), and bypass line B4 (opening / closing valve 23) are removed from the configuration shown in FIG. And the conductivity meter 25 is removed.

The ion exchange section 30 of the present configuration includes
A bypass line B10 is provided for connecting a branch point S1 on the inlet line Li and a point S10 on the downstream line L1 with respect to the on-off valve 11, and the bypass line B1
An on-off valve 31 is provided in the middle of zero.

A bypass line B11 is provided for connecting a branch point S2 on the line L2 and a point S11 on the outlet line L0 on the downstream side of the on-off valve 15. The bypass line B11 is provided in the middle of the bypass line B11. An on-off valve 32 is provided.

The bypass lines B10 to B
Reference numeral 11 denotes a flexible tube, and each of the on-off valves 31 to 32 and each of the branch points S10 to S11 are supported by a support member such as a support base or a support rod, and their positions are fixed. ing.

Next, the operation of the present configuration will be described focusing on the operation of exchanging (or regenerating) each of the resin towers R1 to R5 of the ion exchange section 30. At the initial stage of the water treatment device 7, each of the bypass lines B1, B10 to B11
The on-off valves 20, 31 to 32 provided in the middle of the main line L are closed, and the on-off valves 10 to 11 provided in the middle of the inlet line Li, the line L1, the line L2, and the outlet line Lo of the main line L. , 13 to 15 are opened.

According to this configuration, the first-stage resin towers R1a to R1a-4
When breakthrough (ion break) occurs in the resin tower R4a of the stage, the breakthrough state is indicated by the conductivity meter 26 on the line L.
2 is detected based on the cooling water flowing through the cooling water.

At this time, the inspector responds to the detection signal from the conductivity meter 26 to open and close the on-off valve 20 of the bypass line B1.
Is opened, and the on-off valves 10 and 13 are closed. As a result, the cooling water sent from the activated carbon tower 8 is supplied to the inlet line Li → bypass line B1 (open / close valve 20) → line L2 (open / close valve 14) → resin tower R5a → outlet line Lo, as in the first embodiment. (On-off valve 15). That is, the cooling water bypasses the resin towers R1a to R4a and flows sequentially to the pump 3 via the resin tower R5a which remains active by the bypass line B1, and is sent to the pump 3. Tower R4a can be replaced.

That is, while the cooling water is flowing through the above-mentioned path, the inspector makes the first-stage resin towers R1a to the four-stage resin towers R1a.
4a are replaced with new resin towers R1a 'to R4a', respectively.
(The direction is the same as that of R1a to R4a). Then, the examiner opens the on-off valve 31 of the bypass line B10 and the on-off valve 32 of the bypass line B11, and further opens the on-off valve 13. Subsequently, the inspector closes the on-off valves 10 and 11 for isolating the resin tower R1a 'from the cooling water circulation path and the on-off valves 14 and 15 for isolating the resin tower R5a from the cooling water circulation path, and closes the bypass line B1. Is closed. As a result, the cooling water sent from the activated carbon tower 8 flows into the inlet line Li → bypass line B10 (open / close valve 31) → line L1 → resin towers R2a ′ to R4a ′ → line L2 (open / close valve 13) → bypass line B11 ( Opening / closing valve 32) → outlet line Lo flows sequentially and is sent to pump 3.

In this way, the first-stage resin tower R1a ′ and the last-stage resin tower R5 are isolated (bypassed), and the cooling water is circulated through the newly replaced resin towers R2a ′ to R4a ′. Then, the inspector determines that the first-stage resin tower R1
a ′ is exchanged with the last-stage resin tower R5.

Finally, the inspector confirms that the first resin tower R
1a '(currently the last stage resin tower R5) is opened, the on-off valves 10 and 11 are opened, and the last stage resin tower R5a (now the first stage resin tower R1a') is opened and closed. The valve 14 and the on-off valve 15 are opened. Next, the on-off valve 31 of the bypass line B10 and the on-off valve 32 of the bypass line B11 are closed. As a result, the cooling water flows from the inlet line Li (open / close valve 10) to the resin tower R5a to the line L1.
(Opening / closing valve 11) → resin tower R2a ′ to R4a ′ → line L
2 (on-off valve 13 and on-off valve 14) → resin tower R1a ′ → outlet line Lo and sequentially sent to pump 3.

That is, according to this configuration, the conductivity meter 26
The above-mentioned operations are sequentially repeated in response to the detection signals of the respective resin towers R by a single ion exchange sequence without stopping the plant operation as in the first embodiment.
The water treatment device can be operated while replacing 1a to R5a. In particular, in this configuration, a single conductivity meter may be provided, and the number of bypass lines can be reduced by one compared with the configuration of the first embodiment, so that cost reduction can be achieved.

Further, according to this configuration, the resin tower R5a, which was the last stage, flows into the resin tower R5a, and R2a ′ to R2a ′.
After flowing through R4a ', it finally flows into the resin tower R1a', which was the first stage, and is subjected to ion removal. Therefore, the resin tower R5a which still has activity can be used as the first-stage resin tower, and the resin tower can be used without waste.

In this configuration, the first-stage resin tower R1a '
And the resin tower R5a in the last stage are used interchangeably.
The resin tower R5a at the last stage may be replaced or regenerated with a new resin tower R5a '.

(Third Embodiment) FIG. 8 shows a schematic configuration of an ion exchange section of a water treatment apparatus applied to a fuel cell power plant according to the present embodiment. The configuration of the water treatment device other than the ion exchange unit and the configuration of the fuel cell power plant are as follows:
The description is omitted because it is almost the same as the first embodiment.
Further, the same components as those of the first and second embodiments in the ion exchange unit are denoted by the same reference numerals as those in the first and second embodiments, and the description thereof will be omitted or simplified.

According to FIG. 8, the bypass line B1 (open / close valve 20) is removed from the configuration of FIG. Then, the line L1 is newly added to the ion exchange section 40 having this configuration.
A bypass line B20 connecting the upper branch point S10 and the branch point S2 on the line L2 is provided, and an on-off valve 41 is provided in the middle of the bypass line B20. The on-off valve 12 on the line L1 removed in FIG. 7 is provided as it is, as in the first embodiment.

The above-mentioned bypass line B20 is formed of a flexible tube,
Is supported by a support member such as a support base or a support rod, and its position is fixed.

In the ion exchange unit 40 configured as above, the main difference from the second embodiment is that the position of the branch of the bypass line B20 has shifted from the position of the branch point S1 in the second embodiment to the branch point S10. The operation is substantially the same as that of the second embodiment.

That is, the inspector opens the on-off valve 41 of the bypass line B20 and closes the on-off valves 12 and 13 in response to the detection signal from the conductivity meter 26. As a result,
The cooling water sent from the activated carbon tower 8 is supplied to the inlet line Li → resin tower R1b → line L1 (open / close valve 11) → bypass line B20 (open / close valve 41) → line L2 (open / close valve 14) →
It flows from the resin tower R5b to the outlet line Lo (open / close valve 15).

Then, while the cooling water is flowing through the above-described path, the inspector makes a two-stage resin tower R2b to a four-stage resin tower R4b.
Are replaced with new resin towers R2b ′ to R4b ′, respectively. Subsequently, the examiner opens the on-off valve 31 of the bypass line B10 and the on-off valve 32 of the bypass line B11, and further opens the on-off valve 12 and the on-off valve 13. Further, the inspector closes the on-off valves 10 and 11 for isolating the resin tower R1b from the cooling water flow path and the on-off valves 14 and 15 for isolating the resin tower R5b from the cooling water flow path,
Further, the on-off valve 41 of the bypass line B20 is closed.
As a result, the cooling water sent from the activated carbon tower 8 is supplied to the inlet line Li → bypass line B10 (open / close valve 31) → line L1 (open / close valve 12) → resin towers R2b ′ to R4b ′ → line L2 (open / close valve 13). → Bypass line B11 (open / close valve 32) → Outlet line Lo flows sequentially to pump 3.

The newly exchanged resin towers R2b 'to R4
With the cooling water flowing through b ′, the inspector replaces the first-stage resin tower R1b with a new resin tower R1b ′, and exchanges the resin tower R1b ′ with the last-stage resin tower R5b.

Finally, the inspector confirms that the first-stage resin tower R1b '
The on-off valve 10 and the on-off valve 11 that separated the (currently the last stage resin tower R5b) are opened, and the last stage resin tower R5b is opened.
b (currently the first-stage resin tower R1b ') is opened. Next, the on-off valve 31 of the bypass line B10 and the on-off valve 32 of the bypass line B11 are closed. As a result, the cooling water flows into the inlet line Li (opening / closing valve 10) → resin tower R5b → line L1 (opening / closing valve 11) → resin towers R2b ′ to R4b ′ → line L2
(On-off valve 13 and on-off valve 14) → resin tower R1b ′ → outlet line Lo and sequentially sent to pump 3.

That is, according to this configuration, only the replacement time of the first-stage resin tower R1b is different from the operation of the second embodiment, and the plant operation is stopped as in the first and second embodiments. Without exchanging the resin towers R1b to R5b by a single ion exchange system, the water treatment apparatus can be operated.

In this configuration, the first-stage resin tower R1b '
And the resin tower R5b in the last stage are used interchangeably.
The resin tower R5b in the final stage may be replaced or regenerated with a new resin tower R5b '.

(Fourth Embodiment) FIG. 9 shows a schematic configuration of an ion exchange section of a water treatment apparatus applied to a fuel cell power plant according to the present embodiment. The configuration of the water treatment device other than the ion exchange unit and the configuration of the fuel cell power plant are as follows:
The description is omitted because it is almost the same as the first embodiment.
Further, the same components as those of the first and second embodiments in the ion exchange unit are denoted by the same reference numerals as those in the first and second embodiments, and the description thereof will be omitted or simplified.

In the ion exchange section 50 shown in FIG.
In the configuration of FIG. 7, the on-off valve 11 on the line L1 is removed, and the branch point S1 on the inlet line Li and the line L1
The bypass line B10 connecting the upper point S10 is removed.

According to the present embodiment, the inspector opens the on-off valve 20 of the bypass line B1 and closes the on-off valves 10 and 13 in response to the detection signal from the conductivity meter 26. As a result, the cooling water sent from the activated carbon tower 8 flows into the inlet line Li → the bypass line B1 (open / close valve 20) → the line L2.
(On-off valve 14) → Resin tower R5c → Outlet line Lo (On-off valve 15).

Then, while the cooling water is flowing through the above-described path, the inspector confirms that the first-stage resin tower R1c to the four-stage resin tower R4c
Are replaced with new resin towers R1c ′ to R4c ′, respectively. Subsequently, the examiner opens the on-off valve 32 of the bypass line B11, and further opens the on-off valves 10 and 13. Further, the inspector closes the on-off valves 14 and 15 for isolating the resin tower R5c from the cooling water flow path, and further,
The on-off valve 20 of the bypass line B1 is closed. As a result,
The cooling water sent from the activated carbon tower 8 is supplied to the inlet line Li → resin tower R1c ′ → line L1 (open / close valve 12) → resin tower R2
The flow sequentially proceeds from c ′ to R4c ′ → line L2 (open / close valve 13) → bypass line B11 (open / close valve 32) → exit line Lo and is sent to the pump 3.

The newly exchanged resin towers R1c 'to R4
With the cooling water flowing through c ′, the inspector replaces the last resin tower R5c with a new resin tower R5c ′.

Lastly, the inspector checked the on-off valve 14 and the on-off valve 15 which separated the on-off valve 10 and the resin tower R5c at the last stage.
open. Next, the on-off valve 32 of the bypass line B11 is closed. As a result, the cooling water flows into the inlet line Li (open / close valve 10) → resin tower R1c ′ → line L1 (open / close valve 11) →
Resin towers R2c ′ to R4c ′ → line L2 (opening / closing valve 13 and on / off valve 14) → resin tower R5c ′ → outlet line Lo and are sent to pump 3.

That is, according to this configuration, the first
-As in the third embodiment, each resin tower R1c-
The water treatment device can be operated while replacing R5c. Further, in the present configuration, the resin tower R5c still remaining active in the last stage is directly exchanged for a new resin tower R5c ′, so that the resin tower R5c remaining ionic active cannot be reused. Since the bypass line B10, the on-off valve 31, and the on-off valve 11, which were required in the second and third embodiments, can be omitted,
Cost reduction can be achieved as compared with the configurations of the first to third embodiments.

In each of the above embodiments, each of the branch points S1 to S6, S10 to S11 and each of the on-off valves 10 to 15,
20 to 23, 31 to 32 and 41 are fixed, and the main line L (entrance line Li, line L1, line L2,
Outlet line Lo) and bypass lines B1 to B4, B
Since each of 10 to B11 and B20 is formed of a flexible tube, desorption of the resin towers R1 to R5 becomes very easy, and even if the resin towers R1 to R5 are frequently desorbed, High reliability can be maintained without affecting surrounding devices. Also,
In each embodiment, each bypass line B1 to B4, B10
To B11 and B20 and the corresponding junctions S1 to S6 and S10 to S11 on the main line L were previously joined, but the present invention is not limited to this, and the bypass lines B1 to B4, B10 to B11 and B20 are respectively connected to corresponding confluence points S1 to S6 and S10 to S on the main line L.
11 may be provided in a non-joined state, and may be joined when the resin tower is replaced or regenerated.

In each of the above-described embodiments, the water treatment apparatus provided with a plurality of (five) ion-exchange resin towers R1 to R5 as an ion-exchange series, but the present invention is not limited to this. Any water treatment apparatus provided with two or more stages of ion exchange resin towers may be used.

In each of the embodiments described above, the case where each resin tower is replaced has been described. However, the present invention is not limited to this, and is applicable to a system in which each resin tower is regenerated and installed again. It is possible.

Further, in each of the above-described embodiments, the inspector manually operated the opening / closing valve in accordance with the detection signal output from the conductivity meter to exchange (or regenerate) the resin tower. It is not limited. For example,
For example, a computer circuit that opens and closes the on-off valves 10 to 15, 20 to 23, 31 to 32, and 41 according to a detection signal output from at least one of the conductivity meter 25 and the conductivity meter 26. The valve operation control unit is provided, and each of the on-off valves 10 to 15 and 20 to 2 described above is provided.
Instead of manually operating 3, 31, 32, and 41, the valve operation control unit may cause the valve to automatically open and close. In the case of manual opening / closing valve operation, it is not necessary to provide the above-described conductivity meter. A sampling unit such as a sampling port that can detect the breakthrough state by sampling the cooling water flowing through the point S2 may be provided.

In each of the above-described embodiments, an example is shown in which the water treatment apparatus of the present invention is used in a fuel cell power plant. However, the present invention is not limited to this, and various power plants and boilers can be used. The present invention can be applied to any plant that needs water supply such as equipment.

[0108]

As described above, according to the water treatment apparatus and the ion exchange resin tower exchange or regeneration method of the present invention, a plurality of stages connected in series from the upstream side to the downstream side in the middle of the main line. Among the ion-exchange resin towers, for example, the breakthrough state of the ion-exchange resin tower in the preceding stage of the final-stage ion-exchange resin tower is detected, and only the final-stage ion-exchange resin tower in which the ion activity still remains in response to this detection. The ion-exchange resin tower that has broken through during this time can be replaced or regenerated.

That is, according to the present invention, despite a simple configuration using a plurality of ion-exchange resin columns in one line,
Since the ion exchange resin tower can be replaced or regenerated without stopping the supply of high-purity water to the plant, the cost is extremely low compared to a conventional water treatment apparatus that requires two ion exchange systems. Thus, a more compact water treatment apparatus can be realized. Therefore, a plant such as a fuel cell power plant to which the water treatment apparatus of the present invention is applied can be further reduced in cost and size, and the practicability can be improved.

Further, according to the present invention, when replacing or regenerating the ion-exchange resin tower, a temporary resin tower or the like is not used, so that there is no need for any personnel and equipment costs for storing the temporary resin tower. It is economical. Further, the risk of deteriorating reliability due to the temporal deterioration of the temporary resin tower is avoided, and the reliability of the water treatment apparatus can be maintained at a high level regardless of replacement or regeneration of the ion-exchange resin tower.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a fuel cell power plant including a water treatment apparatus according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of an ion exchange unit of the water treatment apparatus shown in FIG. 1 according to the first embodiment of the present invention.

FIG. 3 is a diagram showing an open / close state of an on-off valve and a flow of cooling water in an ion exchange unit shown in FIG. 2;

FIG. 4 is a diagram showing an open / closed state of an on-off valve and a flow of cooling water in the ion exchange unit shown in FIG. 2;

FIG. 5 is a diagram showing an open / close state of an on-off valve and a flow of cooling water in the ion exchange unit shown in FIG. 2;

FIG. 6 is a diagram showing an open / close state of an on-off valve and a flow of cooling water in the ion exchange unit shown in FIG. 2;

FIG. 7 is a diagram showing a schematic configuration of an ion exchange unit of the water treatment apparatus shown in FIG. 1 according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a schematic configuration of an ion exchange unit of the water treatment apparatus shown in FIG. 1 according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a schematic configuration of an ion exchange unit of the water treatment apparatus shown in FIG. 1 according to a fourth embodiment of the present invention.

FIG. 10 is a block diagram showing a schematic configuration of a fuel cell power plant including a conventional water treatment apparatus.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 fuel cell power plant 2 fuel cell main body 3, 5 pump 6 condenser 7 water treatment device 8 activated carbon tower 9, 30, 40 ion exchange unit 10-15, 20-23, 31-32, 41 on-off valve 25, 26 conductive Rate meter L Main line Li Inlet line Lo Outlet line L1, L2 line R1, R1a, R1b, R1c First stage resin tower R5, R5a, R5b, R5c Last stage resin tower R2 to R4, R2a to R4a, R2b to R4b, R2c
~ R4c Resin tower B1 ~ B4, B10 ~ B11, B20 Bypass line

Claims (9)

[Claims] 1. A water treatment apparatus for removing impurities such as ions from feed water supplied to a plant to produce high-purity water and supplying the water again as the feed water to the plant. A main line that guides the water supplied from the inlet line and outputs the water to the plant through the outlet line, and a middle of the main line to remove the impurities contained in the water flowing through the main line. A plurality of stages of ion exchange resin towers connected in series from the upstream side to the downstream side; a predetermined stage ion exchange resin tower from the upstream side of the plurality of stages of ion exchange resin towers; Is installed in a line connecting the next-stage ion-exchange resin tower located downstream with respect to the ion-exchange resin tower of the above-mentioned ion-exchange resin tower, and flows out of the predetermined-stage ion-exchange resin tower, and Conductivity detecting means for detecting the conductivity of the feedwater flowing through the flow path, and a first flow path from the inlet line to the connection line in the main line according to the conductivity value detected by the conductivity detecting means. And water is supplied to a second flow path from the connection line to the outlet line in the main line, and the first flow path is bypassed at a predetermined timing to bypass the second flow path. A water treatment apparatus, comprising: a bypass unit that allows the supply water to flow through a road. 2. The water treatment apparatus according to claim 1, wherein the next-stage ion-exchange resin tower is a last-stage ion-exchange resin tower located on the most downstream side of the plurality of ion-exchange resin towers. 3. The fuel cell power plant according to claim 1, wherein the water supply is cooling water used for cooling the fuel cell body and condensed water obtained by condensing exhaust gas discharged by power generation of the fuel cell body. The water treatment apparatus according to claim 2, comprising: 4. An ion-exchange resin tower of the first stage on the most upstream side of the plurality of ion-exchange resin towers and a next-stage ion-exchange resin tower located downstream of the first-stage ion-exchange resin tower. A second conductivity detection means installed in a second connection line for detecting the conductivity of feed water flowing out of the first-stage ion exchange resin tower and flowing through the line; The first for flow control provided in the inlet line upstream with respect to the resin tower
Opening / closing valve, an openable / closable first bypass flow path connecting an inlet line on the upstream side with respect to the first opening / closing valve, and the connection line, and the first bypass flow path in the connection line The second on-off valve and the third on-off valve for flow control respectively provided on the upstream side and the downstream side of the connected first junction are connected to the first bypass flow path in the connection line. A second on-off valve and a third on-off valve for flow control respectively provided on the upstream side and the downstream side of the first junction, and an outlet line on the downstream side with respect to the ion-exchange resin tower in the final stage. A fourth on-off valve for flow control provided in the first opening / closing valve, a second openable / closable bypass passage connecting an outlet line on the downstream side with respect to the fourth on-off valve and the second connection line, The second bypass flow path in the second connection line Fifth and sixth on-off valves for flow control provided respectively on the upstream side and on the downstream side of the connected second junction, and an inlet line on the upstream side with respect to the first on-off valve An openable / closable third bypass flow path connecting the fourth on-off valve and an outlet line between the last-stage ion exchange resin tower, and an outlet line on the downstream side with respect to the fourth on-off valve. The water treatment apparatus according to claim 2, further comprising an openable / closable fourth bypass flow path that connects the first on-off valve and an inlet line between the first-stage ion exchange resin towers. 5. The bypass means closes only the first and second on-off valves among the first to sixth on-off valves according to the conductivity value detected by the conductivity detection means, and Opening only the first bypass flow passage among the first to fourth bypass flow passages and allowing the feed water to flow through the first bypass flow passage to the ion-exchange resin tower at the final stage. The second and third ion-exchange resin towers other than the last-stage ion-exchange resin tower are exchanged or regenerated, and the second on-off valve is opened at a required timing after the exchange or regeneration is completed.
By closing the on-off valve and opening the fourth bypass flow passage, the exchange or regeneration of the parts other than the ion-exchange resin tower of the last stage was performed through the first bypass flow passage and the fourth bypass flow passage. The water treatment apparatus according to claim 4, wherein the feed water is passed through an ion exchange resin tower. 6. A first opening / closing valve for flow control provided in an inlet line on an upstream side with respect to the first-stage ion exchange resin tower, and a bypass unit with respect to the first-stage ion exchange resin tower. A second on-off valve for flow control provided on a downstream line, and a first openable / closable bypass flow path connecting an upstream inlet line and the connection line with respect to the first on-off valve A third on-off valve and a fourth on-off valve for flow control respectively provided upstream and downstream of a first junction where the first bypass flow path is connected in the connection line; An openable and closable third bypass flow path connecting a second junction where the first bypass flow path is connected to the inlet line and a downstream line of the second on-off valve; To the outlet line downstream of the ion exchange resin tower A fifth on-off valve for flow control provided, and a fourth open-close flow path that can open and close the first junction and an outlet line downstream of the fifth on-off valve. The water treatment apparatus according to claim 2, further comprising: 7. A first on-off valve for flow control provided on an inlet line on an upstream side of the first-stage ion exchange resin tower, and a bypass on the upstream side with respect to the first on-off valve. An openable and closable first bypass flow path connecting a first inlet line and a downstream line with respect to the first-stage ion exchange resin tower, and a first downstream flow passage with respect to the first-stage ion exchange resin tower. A second on-off valve and a third on-off valve for flow control respectively provided upstream and downstream of the first junction where the first bypass flow path is connected, and the first junction; An openable / closable second bypass flow path connecting the connection line, and flow paths respectively provided upstream and downstream of a second junction where the second bypass flow path is connected in the connection line. Fourth on-off valve and fifth on-off valve for control A sixth on-off valve for flow control provided in an outlet line on the downstream side with respect to the ion-exchange resin tower in the last stage, and a downstream side with respect to the second junction and the sixth on-off valve. The water treatment apparatus according to claim 2, further comprising: a third bypass flow path that can be opened and closed and that connects the outlet line on the side. 8. A first on-off valve for flow control provided on an inlet line on an upstream side with respect to the first-stage ion exchange resin tower, and a bypass on the upstream side with respect to the first on-off valve. Openable and closable first bypass flow path connecting the first inlet flow path and the connection line, and upstream and downstream of a first junction where the first bypass flow path is connected in the connection line. The second for each distribution control provided
A third on-off valve and a third on-off valve, a fourth on-off valve for flow control provided in an outlet line on the downstream side with respect to the ion-exchange resin tower in the final stage, The water treatment apparatus according to claim 2, further comprising: a second bypass passage that can be opened and closed, which connects the downstream opening line to the fourth on-off valve. 9. A main line having an inlet line and an outlet line, for guiding water supplied from the inlet line and outputting the water to the plant via an outlet line, and the impurity contained in the water supplied through the main line. A plurality of stages of ion-exchange resin towers connected in series from the upstream side to the downstream side in the middle of the main line, and the impurities were removed by the multi-stage ion-exchange resin towers In the method of replacing or regenerating an ion exchange resin tower in a water treatment apparatus that supplies high-purity water to the plant as the feed water, the method includes the steps of: To detect the conductivity of the feedwater flowing through the line, and according to the detected conductivity value, the connection from the inlet line in the main line. A second flow path from the connection line to the outlet line in the main line, bypassing the first flow path to the main line, and allowing the feed water to flow through the second flow path from the connection line to the outlet line. Replacing or regenerating an exchange resin tower, and replacing or regenerating an ion exchange resin tower by bypassing the second flow path at a predetermined timing and allowing the feed water to flow only through the first flow path. Method.