JP7282661B2 - purifier - Google Patents

Description

The present invention relates to a purification device.

In power plants such as nuclear power plants and thermal power plants, water used to generate steam for driving steam turbines may contain anions such as sulfate ions as impurities. Purifiers using ion exchange resins are used to remove impurities.

However, when the temperature of the water to be treated is high, the exchange groups of the ion exchange resin may come off, resulting in a decrease in ion exchange performance. For this reason, the water to be treated is cooled before introducing the liquid to be treated into the purifier. In this case, a large amount of energy is required to cool the water to be treated. Also, a large amount of energy is required to perform the reheating.

Various techniques have been proposed to purify high-temperature water to be treated without cooling the water to be treated (see Patent Documents 1 to 3, for example).

Patent No. 3716056 JP-A-2-128872 JP 2012-61407 A

Conventionally, however, it has been difficult to efficiently purify high-temperature water to be treated.

Therefore, the problem to be solved by the present invention is to provide a purifier that can easily perform purification treatment efficiently on high-temperature water to be treated.

A purifier of an embodiment includes an anion adsorbent filling section and a heating section , and purifies water to be treated. The anion adsorbent filling section purifies the water to be treated by adsorbing anions contained as impurities in the water to be treated with the anion adsorbent. The heating section heats the anion adsorbent filled in the anion adsorbent filling section. The anionic adsorbent is a bismuth compound represented by BiO(OH). When the purification process is performed in the anion adsorbent filling section, the anion adsorbent is heated by the heating section to a temperature range of 200° C. or higher and 350° C. or lower.

ADVANTAGE OF THE INVENTION According to this invention, the purification apparatus which can implement|achieve easily purifying efficiently about high temperature to-be-processed water can be provided.

FIG. 1 is a diagram showing an outline of a power plant according to the first embodiment. FIG. 2 is a diagram schematically showing the purification device 10 according to the first embodiment. FIG. 3 is a diagram showing an overview of a power plant according to a modification of the first embodiment; FIG. 4 is a diagram showing an overview of a power plant according to a modification of the first embodiment. FIG. 5 is a diagram schematically showing the purification device 10 according to the second embodiment. FIG. 6 is a diagram schematically showing the purifier 10 according to the third embodiment.

<First embodiment>
[1] Power Plant FIG. 1 is a diagram showing an outline of a power plant according to the first embodiment. FIG. 1 schematically shows part of a nuclear power plant as a power plant 1 .

As shown in FIG. 1 , the power plant 1 is provided with a purification device 10 for purifying reactor water in the pressure vessel 2 .

[2] Purifier 10
FIG. 2 is a diagram schematically showing the purification device 10 according to the first embodiment.

As shown in FIG. 2 , the purifier 10 of this embodiment includes an anion adsorbent filling section 20 and a heating section 40 . The purifier 10 is supplied with reactor water in the pressure vessel 2 (see FIG. 1) as the water to be treated through the pipe L11, and the treated water obtained by purifying the supplied water to be treated flows through the pipe L12. It is configured to return to the pressure vessel 2 (see FIG. 1) via the Each part constituting the purifier 10 will be described in order.

[2-1] Anion adsorbent filling unit 20
In the purification device 10, the anion adsorbent filling part 20 includes a container 21, the inlet of the container 21 is connected to the pipe L11, and the outlet of the container 21 is connected to the pipe L12.

In the anion adsorbent filling unit 20, a bismuth compound represented by the following formula (A) is used as an anion adsorbent 23 for adsorbing anions (such as sulfate ions) contained as impurities in the water to be treated. 21 is filled inside.

BiO(OH) Formula (A)

The anion adsorbent 23 can be filled in the container 21 in various forms such as a powder and a compact, but is preferably a compact. The shape of the molded anion adsorbent 23 is arbitrary, but preferably spherical, for example. The molded body of the anion adsorbent 23 is formed, for example, by filling a mold with powder of the bismuth compound represented by the formula (A) and compressing it. In addition, the molded body of the anion adsorbent 23 may be formed by rolling granulation from a kneaded mixture of the powder of the bismuth compound represented by the formula (A) and water, or by extrusion molding. good too. Also, fine particles of colloidal silica, titania, zirconia, or the like may be used as a binder in order to improve the strength of the molded body.

When a spherical molded body is used as the anion adsorbent 23, the diameter is preferably 0.25 mm or more and 5 mm or less, more preferably 0.3 mm or more and 2 mm or less.

In addition, as the anion adsorbent 23, one in a state of being supported on fibers such as cellulose fibers may be used.

[2-2] Heating unit 40
The heating unit 40 includes a heater and is installed outside the anion adsorbent filling unit 20 . The heating unit 40 is installed to heat the anion adsorbent 23 filled in the anion adsorbent filling unit 20 .

[3] Operation The operation of performing the purification process using the purification device 10 will be described.

When performing the purification treatment, the water to be treated is supplied to the inside of the container 21 through the pipe L11. Here, the water to be treated flows into container 21 at a temperature of 100° C. or higher, for example.

The water to be treated passes through the purifier 10 in a liquid state. That is, the untreated water at the time of water passage is a liquid pressurized to a saturated vapor pressure or higher. Here, inside the container 21, an anion adsorbent 23 adsorbs anions (such as sulfate ions) contained as impurities in the inflowing water to be treated, thereby purifying the water to be treated. . Anions contained in the water to be treated as impurities react with the anion adsorbent 23 while staying in the container 21 constituting the anion adsorbent filling section 20 . As a result, anions (such as sulfate ions) are adsorbed by the anion adsorbent 23 and removed from the water to be treated. Here, the purification treatment using the anion adsorbent 23 is performed inside the container 21 under temperature conditions of, for example, 100° C. or higher.

Moreover, it is preferable to heat the anion adsorbent 23 filled inside the anion adsorbent filling part 20 using the heating unit 40 during the purification process. The anion adsorbent 23 is heated to a temperature of 350° C. or lower, preferably in the range of 200° C. or higher and 350° C. or lower, more preferably in the temperature range of 250° C. or higher and 350° C. or lower. The anion adsorption reaction of the bismuth compound represented by the formula (A) by the anion adsorbent 23 is most effective in the above temperature range.

As described above, the water to be treated that has undergone purification treatment flows out of the container 21 as treated water through the pipe L12 connected to the outlet of the container 21 . The treated water is discharged from the container 21 while the temperature is high.

[4] Summary As described above, in the present embodiment, the anion adsorbent 23 is a bismuth compound represented by BiO(OH) (see formula (A)), and anions A purification process is performed in the adsorbent filling section 20 . Therefore, in the present embodiment, anions contained as impurities in the water to be treated can be efficiently removed from the water to be treated without lowering the temperature of the water to be treated.

The anion adsorption capacity will be explained using Table 1.

As shown in Table 1, Example 1 shows a case where a commercially available ion exchange resin (PAO (manufactured by Powdex)) is used as the anion adsorbent 23, unlike the case of the above embodiment. In Example 1, the purification treatment was tested under the condition that the temperature of the water to be treated was 60°C.

Example 2 shows a case where a bismuth compound represented by BiO(OH) (see formula (A)) is used as the anion adsorbent 23, unlike the case of the above embodiment. In Example 2, a purification treatment test was performed under the condition of 280° C., which is a higher temperature of the water to be treated than in Example 1.

The adsorption capacity of the above bismuth compound was obtained by the following procedure. After adding 0.48 g of the bismuth compound anion adsorbent 23 to 3 mL of sodium sulfate solution (concentration 0.1 mol/L), the solution was sealed in a sealed pressurized container. Then, the sealed pressurized container was held at 280° C. for 18 hours. The sealed pressurized vessel was then quenched and the solution was separated into the anion adsorbent 23 and the filtrate by suction filtration. The sulfate ion concentration in the filtrate was analyzed by ion chromatography (ThermoFisher Scientific ICS1100). Then, based on the following formula (B), the adsorption capacity A [meq/mL] is calculated from the amount X of the anion adsorbent 23, the sulfate ion concentration C1 in the filtrate, and the sulfate ion concentration C0 in the solution before adsorption. asked for The "apparent density" of the bismuth compound for the anion adsorbent 23 was 2.50 g/ml.

A=2(C0-C1)/X (B)

As shown in Table 1, Example 2, in which a bismuth compound represented by BiO(OH) (see formula (A)) was used as the anion adsorbent 23, had a higher temperature than Example 1 (280°C). The adsorption capacity of Example 2 was equal to or greater than that of Example 1. Thus, in Example 2, the anions contained as impurities in the water to be treated could be removed from the water to be treated with an efficiency equal to or higher than that in Example 1 without lowering the temperature of the water to be treated.

[5] Modification In the above embodiment, as shown in FIG. 1, the case where reactor water flows from the pressure vessel 2 into the purifier 10 as water to be treated has been described, but the present invention is not limited to this.

3 and 4 are diagrams showing an outline of a power plant according to a modification of the first embodiment.

As shown in FIG. 3 , the power plant 1 may include a filter 3 that filters the water to be treated before being purified by the purification device 10 .

Further, as shown in FIG. 4 , the power plant 1 includes a steam generator 4 , a high pressure turbine 5 (steam turbine), a low pressure turbine 6 (steam turbine), a condenser 7 and a filter 8 in addition to the purification device 10 . and may be provided. In this case, steam generated by the steam generator 4 is sequentially supplied to the high-pressure turbine 5 and the low-pressure turbine 6 as a working medium. Steam discharged from the low-pressure turbine 6 is condensed in the condenser 7 , and the condensate from the condenser 7 is filtered by the filter 8 . The condensed water that has been filtered by the filter 8 is purified by the purification device 10 as water to be treated. As described above, the purification device 10 may be used in a condensate purification system in addition to the reactor water purification system.

<Second embodiment>
[1] Purifier 10
FIG. 5 is a diagram schematically showing the purification device 10 according to the second embodiment.

As shown in FIG. 5, the purifier 10 of the present embodiment includes an anion adsorbent filling section 20 and a heating section 40, as well as a cation adsorbent filling section 30 and a heating section 40, unlike the first embodiment. and a section 50 . Except for this point and matters related thereto, this embodiment is the same as the case of the first embodiment.

[1-1] Cationic adsorbent filling unit 30
In the purification device 10, the cationic adsorbent filling section 30 includes a container 31, the inlet of which is connected to a pipe L10, and the outlet of the container 31 is connected to a pipe L11.

In the cation adsorbent filling section 30 , a container 31 is filled with a cation adsorbent 33 that adsorbs cations contained as impurities in the water to be treated. The cation adsorbent 33 is, for example, niobic acid, and an inorganic ion exchanger capable of purifying high-temperature water to be treated can be used.

[1-2] Heating unit 50
The heating unit 50 includes a heater and is installed outside the cation adsorbent filling unit 30 . The heating unit 50 is installed to heat the cation adsorbent 33 filled in the cation adsorbent filling unit 30 .

[2] Operation The operation of performing the purification process using the purification device 10 will be described.

When performing the purification treatment, the water to be treated is supplied to the inside of the container 31 of the cation adsorbent filling section 30 through the pipe L10. Here, the water to be treated flows into the vessel 31 at a temperature of 80° C. or higher, for example.

Inside the container 31, the cation adsorbent 33 adsorbs cations contained as impurities in the inflowing water to be treated, thereby purifying the water to be treated. The cations contained in the water to be treated as impurities are adsorbed by the cation adsorbent 33 while staying in the container 31 constituting the cation adsorbent filling part 30, and are removed from the water to be treated. .

During the purification process in the cationic adsorbent filling section 30 , the heating section 50 is appropriately used to heat the cationic adsorbent 33 filled inside the cationic adsorbent filling section 30 .

Then, the water to be treated that has been purified in the cationic adsorbent filling section 30 is treated as treated water and purified in the anionic adsorbent filling section 20 in the same manner as in the first embodiment.

[3] Summary As described above, in the present embodiment, similarly to the first embodiment, cations and anions contained as impurities in the water to be treated can be efficiently removed without lowering the temperature of the water to be treated. can be removed from the water to be treated.

<Third Embodiment>
[1] Purifier 10
FIG. 6 is a diagram schematically showing the purifier 10 according to the third embodiment.

As shown in FIG. 6, the purifier 10 of this embodiment further includes a filter section 60 unlike the case of the second embodiment. Except for this point and matters related thereto, this embodiment is the same as the case of the first embodiment.

The filter unit 60 has an inlet connected to the pipe L12 and an outlet connected to the pipe L13. The filter unit 60 is configured to filter the treated water that has been purified in the cationic adsorbent filling unit 30 and the anionic adsorbent filling unit 20 . Specifically, the filter part 60 is composed of a film having a shape such as a flat plate shape, a pleated shape, a hollow fiber shape, a non-woven fabric shape, a sintered body, or the like. The membrane constituting the filter part 60 is formed of a porous material made of ceramic, highly heat-resistant resin, metal, or the like, and the upper limit dose for use is preferably 10 kGy or more, particularly 1 to 10 Gy. .

[2] Summary As described above, in the present embodiment, the water to be treated is sequentially purified in the cation adsorbent filling unit 30 and the anion adsorbent filling unit 20, and then filtered by the filter unit 60. Filtration is performed in If the cation adsorbent 33 of the cation adsorbent-filled part 30 and the anion adsorbent 23 of the anion adsorbent-filled part 20 wear over time and a missing part occurs, the missing part Fragments may flow. However, in this embodiment, the filtering process of the filter unit 60 can capture solids such as fragments thereof. Therefore, solids such as fragments can be removed from the treated water.

<Others>
It should be noted that the present invention is not limited to the above-described embodiment as it is, and in the implementation stage, it can be implemented in various forms other than the above-described embodiment. Various omissions, additions, replacements, and modifications can be made to the present invention without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Power plant, 2... Pressure vessel, 3... Filter, 4... Steam generator, 5... High pressure turbine (steam turbine), 6... Low pressure turbine (steam turbine), 7... Condenser, 8... Filter, DESCRIPTION OF SYMBOLS 10... Purification apparatus, 20... Anion adsorbent filling part, 21... Container, 23... Anion adsorbent, 30... Cationic adsorbent filling part, 31... Container, 33... Cationic adsorbent, 40... Heating part, 50... Heating part, 60... Filter part, L10... Piping, L11... Piping, L12... Piping, L13... Piping

Claims (5)

A purification device for purifying water to be treated,
an anion adsorbent filling unit that purifies the water to be treated by adsorbing anions contained as impurities in the water to be treated with an anion adsorbent ;
a heating unit for heating the anion adsorbent filled in the anion adsorbent filling unit;
with
The anion adsorbent is a bismuth compound represented by BiO (OH) ,
When the purification process is performed in the anion adsorbent filling unit, the anion adsorbent is heated by the heating unit to a temperature range of 200 ° C. or higher and 350 ° C. or lower.
purifier. The water to be treated is water used to generate steam for driving a steam turbine,
2. Purifier according to claim 1. a cation adsorbent filling unit that purifies the water to be treated by adsorbing cations contained as impurities in the water to be treated with a cation adsorbent;
The purification device according to claim 1 or 2. Further comprising a filter unit for filtering the water to be treated,
The purification device according to any one of claims 1 to 3. The water to be treated is liquid,
A purification device according to any one of claims 1 to 4.

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