JP2004223513A - Method for filling ion exchange resin in condensed water desalting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the quality of treated water by reducing leakage of a very small amount of organic material when a regenerated ion exchange resin is filled in a desalting column and water is supplied to the desalting apparatus, although inorganic ions such as Na-ion and CI-ion achieve the target of purity in connection with the improvement of the treated water even in case of the conventional condensed water desalting apparatus. <P>SOLUTION: A method for filling an ion exchange resin in a condensed water desalting apparatus, when a cation exchange resin C and an anion exchange resin A which are regenerated in regenerating equipment 20 are filled in a desalting column 11, is to transport and fill a part or a whole of the anion exchange resin A from the regenerating equipment 20 to the desalting column 11. Next, in the case of transporting a part of the anion exchange resin A, the cation exchange resin C and the residual anion exchange resin A are mixed in the regenerating device and the mixed ion exchange resin CA is transported from the regenerating equipment 20 to the desalting column 11 and is laminated on the cation exchange resin C. In case of transporting a whole of the anion exchange resin A, the cation exchange resin C is transported alone from the regenerating equipment 20 to the desalting column 11 and is laminated on the anion exchange resin A. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a method for filling an ion exchange resin in a condensate desalination apparatus for desalinating condensate from a thermal power plant or a nuclear power plant.

  When generating power at a thermal power plant or a nuclear power plant, high-purity water is heated inside a boiler or steam generator using thermal power or nuclear power to produce steam, and the steam drives a power generation turbine, I am trying to generate electricity. At the time of power generation, a cycle in which steam after power generation is cooled in a condenser and collected as condensate water, and the condensate water is heated again to produce steam is repeated. In this circulation cycle, the condensed water circulating in the system is contaminated with suspended substances (hereinafter referred to as “cladding”) consisting of various impurity ions and metal oxides. Need to be removed.

  Therefore, in the condensing system of thermal power plants and nuclear power plants described above, condensate ions and cladding in double water are used by using a condensate desalination device equipped with a plurality of desalination towers filled with cation exchange resin and anion exchange resin. Has been removed. Further, a cation exchange resin is a hydrogen ion type, an anion exchange resin is a H-OH type condensate desalination device used as a hydroxyl group type, a cation exchange resin is an ammonia type, and an anion exchange resin is an ammonia type used as a hydroxyl group type. There is a condensate desalination unit. In the case of the H-OH type condensate desalination apparatus, even if a small amount of seawater may enter the condensate from the condenser, sodium ions and chloride ions caused by the seawater can be condensed by the condensate desalination apparatus. Of course, the cladding and other trace heavy metals present in the condensate even in normal times when seawater is not mixed, as well as ammonium ions added as a corrosion inhibitor, are removed by the condensate desalination equipment. The condensate is purified so that the electric conductivity is generally 0.1 μS / cm or less, and the purified water is used as power generation water. On the other hand, in the case of an ammonia type condensate desalination apparatus, the cation exchange resin is converted into an ammonia type to remove all impurity ions and suspended substances other than ammonium ions in the condensate.

  However, in any type of condensate desalination apparatus, when a certain amount of condensate is purified, the ion exchange resin breaks. At that time, the ion exchange resin is regenerated. When performing this regeneration, first, the ion exchange resin is transferred from the desalination tower of the condensate desalination apparatus to the regeneration tower of the regeneration equipment. Then, after removing the clad adhering to the surface of the ion exchange resin by performing air agitation (air scrubbing) and back washing in the regeneration tower, the cation exchange resin is subjected to back washing in the regeneration tower using the specific gravity difference. And an anion exchange resin. After separating the ion exchange resin, pass an alkali regenerant such as aqueous sodium hydroxide through the anion exchange resin, and pass an acid regenerant such as aqueous sulfuric acid or hydrochloric acid through the cation exchange resin. Both ion exchange resins are regenerated by desorbing impurity ions attached to the resin.

  The regeneration method includes a one-tower regeneration method and a two-tower regeneration method. In the case of the single-column regeneration method, both ion exchange resins are separated by a specific gravity difference in the regeneration tower to form a cation exchange resin layer on the lower side and an anion exchange resin layer on the upper side. In this method, an acid regenerant is passed through the cation exchange resin and an alkali regenerant is passed through the upper anion exchange resin layer to regenerate both ion exchange resins in one column. In the case of the two-column regeneration method, after separating both ion-exchange resins in one column (cation regeneration column), the upper layer anion exchange resin is transferred to another regeneration column (anion regeneration column). In this method, the ion exchange resins are regenerated in separate regenerators.

  When the regeneration of both ion-exchange resins is completed, the two ion-exchange resins after regeneration are stored in a storage tank and kept in a standby state until the next desalination tower reaches the end of water flow. Then, when the water-flow end point is reached, the ion exchange resin in the desalination tower is taken out of the desalination tower and transferred to the regeneration tower. After that, both ion exchange resins waiting in the storage tank are transferred to the empty desalination tower, and the cation exchange resin and the anion exchange resin are sufficiently mixed in the desalination tower. Used for

By the way, the water quality required for the treated water of the condensate desalination apparatus has tended to become more and more purified recently from the viewpoint of preventing corrosion of boilers, steam generators, nuclear reactors and the like and preventing scale adhesion. For example, in the case of Na ions, Cl ions, and SO ₄ ions, the respective concentrations are targeted for a purity of 0.01 ppb or less. Therefore, various improvements have been made in the condensate desalination apparatus in order to obtain such high-purity treated water, and as a result, at present, the above-mentioned target purity can be achieved.

  However, in the case of the conventional condensate desalination apparatus, Na ions and Cl have to be added as the quality of the treated water becomes higher and higher from the viewpoint of preventing corrosion of boilers, steam generators, nuclear reactors and the like and preventing adhesion of scale. Inorganic ions such as ions have achieved the target purity, but when the regenerated ion-exchange resin is filled in a desalination tower and water flow is started, a very small amount of organic matter leaks into the treated water at the beginning of the start. However, this trace amount of organic matter has become a new problem with the trend toward higher purity. In particular, the cation exchange resin that has been regenerated and used repeatedly has the problem that the organic matter gradually leaks out of the cation exchange resin into the treated water due to oxidative deterioration during use, and the quality of the treated water deteriorates. .

By the way, according to recent studies, organic substances include styrene sulfonic acid oligomers and low molecular weight polymers, and these organic substances are commonly used in condensate demineralizers, such as styrene and divinylbenzene. Has been found to be eluted from the sulfonated strongly acidic cation exchange resin. Also, the treated water of the condensate desalination unit is supplied to steam generators such as boilers, steam generators, and nuclear reactors as described above. If the organic substances are contained in the treated water, these organic substances are decomposed by the action of high temperature and high pressure in the steam generator to generate SO ₄ ions and the like, and the SO ₄ ions corrode the steam generator and the like. There is a possibility that the steam generator and the like may be adversely affected.

  The present invention has been made in order to solve the above-mentioned problems, and it is possible to improve the quality of treated water by reducing organic substances leaking into treated water from a cation exchange resin of a condensate desalination apparatus. In condensate desalination equipment that can prevent corrosion of components that make up high temperature and high pressure systems such as boilers of thermal power plants, nuclear reactors of boiling water nuclear power plants, steam generators of pressurized water nuclear power plants, etc. It is an object of the present invention to provide a method for filling an ion exchange resin.

  The present inventors have conducted various studies on measures to prevent the leakage of organic substances into the treated water, and as a result, in the case of a conventional condensate desalination apparatus, mixing of the regenerated cation exchange resin and anion exchange resin from the regeneration equipment After the ion exchange resin is transferred to the desalting tower and filled, an operation is further performed in which the cation exchange resin and the anion exchange resin are mixed with air in the desalination tower to form a mixed ion exchange resin layer. Although the treatment is performed, the cation exchange resin has a higher specific gravity than the anion exchange resin, and the cation exchange resin tends to be unevenly distributed in the lower part of the mixed ion exchange resin layer even when remixing is performed in the desalting tower. When condensate is passed from the top to the bottom of the tower, the organic substances eluted from the cation exchange resin in the lower layer have a low probability of coming into contact with the anion exchange resin, and are directly treated without being trapped by the anion exchange resin. It was found that leakage in.

  The present invention has been made based on the above findings, and the method of filling an ion exchange resin in a condensate desalination apparatus according to claim 1 is a method for filling a used cation exchange resin in a desalination tower of a condensate desalination apparatus. And transferring the anion exchange resin to a regeneration facility, after regenerating each of the ion exchange resins in the regeneration facility, transferring and filling each regenerated ion exchange resin from the regeneration facility to the desalination tower, When filling the desalination tower with the cation exchange resin and the anion exchange resin regenerated in the regeneration equipment, first, transfer or fill some or all of the anion exchange resin from the regeneration equipment to the desalination tower, Next, when a part of the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin are mixed in the regenerating facility, and the mixed ion exchange resin is mixed with the mixed ion exchange resin from the regenerating facility. Transfer to the salt tower and laminate on the anion exchange resin, and when transferring all the anion exchange resin, transfer the cation exchange resin alone from the regeneration equipment to the desalination tower and onto the anion exchange resin. It is characterized by being laminated.

  In addition, the method of charging an ion exchange resin in a condensate desalination apparatus according to claim 2 of the present invention is characterized in that the used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination apparatus are supplied to a regeneration facility. Transferring, after regenerating each ion exchange resin in this regeneration equipment, in the method of transferring and filling each regenerated ion exchange resin from the regeneration equipment to the desalination tower, the cations regenerated in the regeneration equipment When filling the exchange resin and the anion exchange resin in the desalting tower, beforehand, after mixing the cation exchange resin and the anion exchange resin in the regeneration equipment, separated again into the cation exchange resin and the anion exchange resin, A part or all of the anion exchange resin after separation from the regeneration equipment is transferred to the desalting tower for filling, and then, when a part of the anion exchange resin is transferred, cation exchange is performed. Fat and the remaining anion exchange resin are mixed, and the mixed ion exchange resin is transferred from the regenerating equipment to the desalting tower and laminated on the anion exchange resin. The present invention is characterized in that the exchange resin is independently transferred from the regeneration facility to the desalination tower, and is stacked on the anion exchange resin.

  In addition, the method for charging an ion exchange resin in a condensate desalination apparatus according to claim 3 of the present invention is a method for transferring used cation exchange resin and anion exchange resin in a desalination tower of a condensate desalination apparatus to a regeneration facility. After transferring and individually regenerating each of the ion exchange resins in the first and second regeneration towers of the regeneration equipment, each of the regenerated ion exchange resins is transferred from the first and second regeneration towers via the storage tank to the above-described storage tank. In the method of transferring and filling the cation exchange resin and the anion exchange resin regenerated in the regeneration facility in the desalination tower, the regenerated cation exchange resin is transferred from the first regeneration tower to the desalination tower. Transferring the regenerated anion exchange resin to the storage tank and transferring the regenerated anion exchange resin from the second regeneration tower to the storage tank while leaving a part of the anion exchange resin; and anion exchange with the cation exchange resin in the storage tank. After the step of mixing fats and transferring and filling the anion exchange resin remaining in the second regeneration tower from the second regeneration tower to the desalination tower, the mixed ion exchange resin is transferred from the storage tank to the desalination tower. And laminating on an anion exchange resin.

  In addition, the method for charging an ion exchange resin in a condensate desalination apparatus according to claim 4 of the present invention is characterized in that a used cation exchange resin and an anion exchange resin in a desalination tower of a condensate desalination apparatus are supplied to a regeneration facility. After transferring and individually regenerating each of the ion exchange resins in the first and second regeneration towers of the regeneration equipment, each of the regenerated ion exchange resins is transferred from the first and second regeneration towers via the storage tank to the above-described storage tank. In the method of transferring and filling the cation exchange resin and the anion exchange resin regenerated in the regeneration facility in the desalination tower, the regenerated cation exchange resin is transferred from the first regeneration tower to the desalination tower. Transferring the regenerated anion exchange resin from the second regeneration tower to the storage tank while transferring the resin to the storage tank, and mixing the cation exchange resin and the anion exchange resin in the storage tank and then performing cation exchange again. A step of separating fats and anion exchange resins, a step of transferring some or all of the separated anion exchange resins from the storage tank to the desalting tower and filling the same, and a case where some anion exchange resins are transferred. In the storage tank, after the cation exchange resin after separation and the remaining anion exchange resin after separation are mixed, the mixture is transferred from the storage tank to the desalination tower, laminated on the anion exchange resin, and all anions are removed. And transferring the separated cation exchange resin from the storage tank to the desalting tower alone and stacking the cation exchange resin on the anion exchange resin.

  In addition, the method for charging an ion exchange resin in a condensate desalination apparatus according to claim 5 of the present invention provides a method for recycling used cation exchange resin and anion exchange resin in a desalination tower of a condensate desalination apparatus to a regeneration facility. A method in which each of the ion exchange resins is individually regenerated in the first and second regeneration towers of the regeneration equipment, and then the regenerated ion exchange resins are directly transferred from the regeneration tower to the desalination tower for filling. In filling the cation exchange resin and the anion exchange resin regenerated in the regeneration facility into the desalting tower, the anion exchange resin after the regeneration is removed from the second regeneration tower while leaving a part of the anion exchange resin. (1) transferring to the regeneration tower, mixing the cation exchange resin and the transferred anion exchange resin in the first regeneration tower, and transferring the anion exchange resin remaining in the second regeneration tower to the desalting tower. After filling The mixed ion exchange resin in the regeneration tower is characterized in that a step of laminating on the anion exchange resin was transferred to the demineralizer.

  Further, the method for charging an ion exchange resin in a condensate desalination apparatus according to claim 6 of the present invention provides a method for recycling used cation exchange resin and anion exchange resin in a desalination tower of a condensate desalination apparatus to a regenerating facility. A method in which each of the ion exchange resins is individually regenerated in the first and second regeneration towers of the regeneration equipment, and then the regenerated ion exchange resins are directly transferred from the regeneration tower to the desalination tower for filling. In filling the cation exchange resin and the anion exchange resin regenerated in the regeneration equipment into the desalination tower, transferring the anion exchange resin after regeneration from the second regeneration tower to the first regeneration tower; (1) mixing the cation exchange resin and the transferred anion exchange resin in the regeneration tower, and then separating the mixture into the cation exchange resin and the anion exchange resin again; Desalination And, when a part of the anion exchange resin is transferred, mixing the cation exchange resin after separation and the remaining anion exchange resin after separation in the first regeneration tower, and then performing the first regeneration When the anion exchange resin is transported from the tower to the above-mentioned desalting tower and laminated on the anion exchange resin, and all the anion exchange resins are transported, the cation exchange resin after separation from the first regeneration tower is independently transferred to the above-mentioned desalination tower. And laminating on an anion exchange resin.

  In addition, the method for charging an ion exchange resin in the condensate desalination apparatus according to claim 7 of the present invention is characterized in that the used cation exchange resin and the anion exchange resin in the desalination tower of the condensate desalination apparatus are supplied to the regeneration facility. Transferring, after regenerating each of the ion-exchange resins in one regeneration tower of the regeneration equipment, transferring and regenerating each regenerated ion-exchange resin from the regeneration tower to the desalination tower, When filling the cation exchange resin and the anion exchange resin regenerated in the desalination tower, part or all of the separated anion exchange resin after the regeneration in the regeneration tower is partially or entirely separated from the regeneration tower. The step of filling by transferring to and, when a part of the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin are mixed in the regeneration tower, and the mixed ion exchange resin is mixed with the mixed ion exchange resin from the regeneration tower. Step of transferring to the salt tower and stacking on the anion exchange resin, and when transferring all the anion exchange resin, transferring the cation exchange resin in the regeneration tower to the desalting tower and stacking on the anion exchange resin. And characterized in that:

  Further, in the method for charging an ion exchange resin in the condensate desalination apparatus according to claim 8 of the present invention, the used cation exchange resin and the anion exchange resin in the desalination tower of the condensate desalination apparatus are supplied to the regeneration facility. Transfer and separate regeneration of each of the ion exchange resins in one regeneration tower of this regeneration facility, and then transfer and recharge each ion exchange resin from the regeneration tower to the desalination tower after regeneration. In filling the cation exchange resin and the anion exchange resin regenerated in the regeneration tower into the desalination tower, after mixing the separated cation exchange resin and the anion exchange resin after regeneration in the regeneration tower, A step of separating the cation exchange resin and the anion exchange resin again, and a step of transferring a part or all of the separated anion exchange resin in the regeneration tower from the regeneration tower to the desalination tower and filling the same, When the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin are mixed in the regeneration tower, and the mixed ion exchange resin is transferred from the regeneration tower to the desalination tower and transferred to the anion exchange resin. Stacking and transferring all the anion exchange resin, and transferring the cation exchange resin in the regeneration tower to the desalting tower and stacking the anion exchange resin on the anion exchange resin. .

  ADVANTAGE OF THE INVENTION According to the invention as set forth in claims 1 to 8 of the present invention, it is possible to reduce organic substances leaking from the cation exchange resin of the condensate desalination apparatus into the treated water, and to improve the quality of the treated water. It can prevent corrosion of the components that make up the high-temperature and high-pressure system, such as boilers for thermal power plants, nuclear reactors for boiling water nuclear power plants, and steam generators for pressurized water nuclear power plants. In this case, it is possible to provide a method for charging an ion exchange resin in a condensate desalination apparatus capable of effectively preventing corrosion of a component of a high-temperature and high-pressure system when the ion exchange resin is used.

  In particular, according to the second, fourth, sixth and eighth aspects of the present invention, in addition to the above effects, a lower layer made of an anion exchange resin is further formed below the desalting tower. Thus, it is possible to provide a method of charging an ion exchange resin in a condensate desalination apparatus capable of preventing sodium leakage from the lower anion exchange resin into the treatment water, which may possibly occur, from occurring.

  Hereinafter, the present invention will be described based on examples shown in FIGS. 1 to 7 and Tables 1 to 3. FIG. 1 is a block diagram showing an embodiment of a condensate desalination apparatus to which the method for filling an ion exchange resin in the condensate desalination apparatus of the present invention can be suitably applied, and FIG. 2 (a) is shown in FIG. FIG. 3B is a configuration diagram showing a configuration of a lower portion of a desalination tower, FIG. 3B is a configuration diagram showing a configuration of a lower portion of another desalination column, and FIGS. FIG. 7 is a configuration diagram showing a regeneration facility of another embodiment of a condensate desalination apparatus to which a method of filling an exchange resin can be suitably applied, FIG. 7 is a graph showing leakage of Na ions in the present example, and Table 1 is Table showing the experimental conditions when the performance of the condensate desalination apparatus of the present invention was tested on a bench scale, Table 2 shows the results of leakage of organic substances and the like when tested on a bench scale, and Table 3 shows the results in this example. It is a table | surface which shows the leak result of Na ion.

  First, an embodiment of a condensate desalination apparatus suitably used when carrying out the method for filling an ion exchange resin in the condensate desalination apparatus of the present invention will be described. As shown in FIG. 1, for example, as shown in FIG. 1, a condensate desalination apparatus 10 according to the present embodiment includes a plurality of desalination towers 11 (only two towers are illustrated in FIG. 1) and ion exchange in the desalination towers 11. And a regenerating facility 20 for regenerating the resin. An inflow pipe 12 into which condensate flowing from a condenser (not shown) through a pre-filter (not shown) flows in is connected to an upper part of each desalination tower 11, and a lower part of each of the lower parts. Is connected to an outflow pipe 13 through which treated water after desalination flows out. The condensed water flowing from the inflow pipe 12 into each of the desalination towers 11 flows through the respective ion-exchange resin layers 14 in a descending flow, and is desalinated by the ion-exchange resin during the flow of water. It flows out from the outflow pipe 13. Further, valves 12A and 13A are attached to the inflow pipe 12 and the outflow pipe 13 of each desalination tower 11, and when the ion-exchange resin in the desalination tower 11 that has reached the water flow end point is regenerated, The valves 12A and 13A are closed to disconnect from the other desalination towers 11. In addition, each desalination tower 11 is configured to reach the water passing end point in order at substantially equal time intervals.

  Thus, the ion-exchange resin layer 14 is composed of upper and lower layers as shown in FIG. The upper layer 14A is a mixed ion exchange resin CA obtained by mixing a strongly acidic cation exchange resin (hereinafter, simply referred to as “cation exchange resin”) C and a strongly basic anion exchange resin (hereinafter, simply referred to as “anion exchange resin”) A, Alternatively, it is formed of the cation exchange resin C alone. The lower layer 14B is formed of the anion exchange resin A alone. Then, the cation exchange resin C and the anion exchange resin A of the ion exchange resin layer 14 which has reached the water passing end point are transferred to the regeneration equipment 20 for regeneration, and are used repeatedly.

  The cation exchange resin C used in the condensate desalination apparatus 10 is generally produced by copolymerizing styrene and divinylbenzene to produce a copolymer. It is obtained by converting However, it is unavoidable to produce very small but unreacted monomers, oligomers or low molecular weight polymers which do not reach the intended degree of polymerization in these synthesis steps. Therefore, the residual impurities in the cation exchange resin are reduced by subsequent purification treatment before use, but styrene sulfonic acid oligomers and low molecular weight polymers will remain, albeit slightly, and this residue will elute into running water. Is inevitable. Further, the ion exchange resin undergoes oxidative deterioration during use over time. In the case of the cation exchange resin, the styrene sulfonic acid oligomer or low molecular polymer is easily eluted due to the oxidative deterioration. However, since styrene sulfonic acid is an anion component, it is captured by the anion exchange resin A by an ion exchange reaction with the anion exchange resin A and by physical adsorption to the anion exchange resin A.

  Although a small amount of organic matter is eluted from the cation exchange resin C into the condensed water as described above, in the present embodiment, the organic matter eluted from the cation exchange resin C is prevented from leaking into the treated water as it is. Therefore, the ion-exchange resin layer 14 is composed of the upper and lower two layers as described above, the upper layer 14A is formed of a mixed ion-exchange resin CA of the cation-exchange resin C and the anion-exchange resin A or the cation-exchange resin C alone, The lower layer 14B is formed of the anion exchange resin A. Therefore, when the upper layer 14A is formed of the mixed ion exchange resin CA, the cation exchange resin C is unevenly distributed in the lower layer due to the difference in specific gravity from the anion exchange resin A and becomes cation-rich, so that the cation exchange resin C is supplied when water is passed. Even if organic substances eluted from the resin leak from the mixed ion exchange resin CA of the upper layer 14A, since the lower layer 14B is formed of the anion exchange resin A, the organic substances leaking from the upper layer 14A are almost captured by the anion exchange resin A of the lower layer 14B. Therefore, it hardly leaks into the treated water, and the deterioration of the treated water quality can be prevented. The same applies to the case where the upper layer 14A is formed of the cation exchange resin C alone.

  The lower layer 14B made of the anion exchange resin A may be formed at a layer height h that can surely capture the organic substances leaking from the cation exchange resin C of the upper layer 14A. What is necessary is just 200 mm from the outflow point of the salted water. How to take the bed height h differs depending on the tower configuration of the desalination tower 11. For example, when the treated water shown in FIG. 2A is configured to flow out through the annular water collecting pipes 15 arranged in a plurality of upper and lower stages, the layer height h is the highest in the uppermost stage. The outflow point of the water collecting pipe 15 is used as a reference point, and the height is from this reference point to the upper surface of the lower layer 14B. It is sufficient that this height is at least 200 mm. When the treated water is configured to flow out through the outflow portion 16A of the support plate 16 as shown in FIG. 2B, the layer height h is determined by the outflow point 16A of the support plate 16. Is the reference point, and the height from this reference point to the upper surface of the lower layer 14B.

Accordingly, in the condensate desalination apparatus 10 of the present embodiment, when the condensate is treated using the desalination tower 11 in which the upper layer 14A is made of the mixed ion exchange resin CA, the condensate flows from the inflow pipe 12 to the respective condensate. When the condensate flows into the salt tower 11 in parallel, in each of the desalination towers 11, while the condensate passes through the upper layer 14 </ b> A, impurity ions such as Na ions, Cl ions, and metal ions in the condensate are mixed in the upper layer 14 </ b> A. It is removed by the resin CA. Then, organic substances such as oligomers of styrene sulfonic acid leaking from the cation exchange resin C in the upper layer 14A are captured by the anion exchange resin A while the water treated in the upper layer 14A passes through the lower layer 14B, and are discharged from each desalting tower 11. The amount of organic substances leaking from the treated water is significantly reduced. Therefore, even if this treated water is subjected to the action of high temperature and high pressure in a boiler, a steam generator, and the like on the downstream side of the condensate desalination apparatus 10, it does not generate SO ₄ ions and prevents the corrosion of these components. can do. When the upper layer 14A is composed of the cation exchange resin C alone, cations such as Na ions and metal ions are captured by the cation exchange resin C of the upper layer 14A, and Cl ions and the like are trapped by the anion exchange resin A of the lower layer 14B. Is trapped. In addition, the lower layer 14B also captures organic substances leaking from the upper layer 14A, and can significantly reduce the entry of organic substances into the treated water. Then, when any one of the desalination towers 11 reaches the water passing end point, the valves 12A and 13A are closed to separate from the other desalination towers 11, and the ion exchange resin in the desalting tower 11 that has reached the water passing end point is removed. The regenerated ion-exchange resin is regenerated in the regenerating facility 20, and the demineralization tower 11 is charged.

  Next, the regeneration equipment 20 suitably used for carrying out the method for filling the ion exchange resin in the condensate desalination apparatus of the present invention will be described with reference to FIG. In the present embodiment, the transfer of the ion-exchange resin will be mainly described. In the following description, only the resin transfer pipe is illustrated as a pipe, and other auxiliary equipment such as a water supply / drain pipe and a gas pipe for supplying air and the like are illustrated in the drawings. Omitted from The regeneration equipment 20 shown in FIG. 1 is a two-tower regeneration type regeneration equipment. As shown in the figure, the regeneration equipment 20 receives a whole ion exchange resin in one desalination tower 11 and regenerates the cation exchange resin C, and the first regeneration tower (hereinafter referred to as “cation regeneration tower”). ) 21, a second regeneration tower (hereinafter referred to as “anion regeneration tower”) 22 for receiving the anion exchange resin A from the cation regeneration tower 21 and regenerating it, and each of the regenerated towers 21 and 22 The storage tank 23 is configured to receive the ion-exchange resin and store both ion-exchange resins until the next desalination tower 11 reaches the end point of water flow.

  The cation regeneration tower 21 is connected to each of the desalination towers 11 via a first resin transfer pipe 24. One of the first resin transfer pipes 24 is connected to a lower part of each desalting tower 11, and the other is connected to an upper part of the cation regeneration tower 21. Then, when transferring the ion exchange resin from the desalting tower 11 to the cation regenerating tower 21, the valve 24 </ b> A of the first resin transfer pipe 24 is opened, and water such as demineralized water supplied into each desalting tower 11 and The ion exchange resin is transferred into the cation regeneration tower 21 via a first resin transfer pipe 24 by a gas such as air. Further, a distributor 21A for supplying an acid regenerating agent such as hydrochloric acid or sulfuric acid is provided in the cation regenerating tower 21. Accordingly, the regeneration of the cation exchange resin C in the cation regeneration tower 21 is performed as follows. That is, in the cation regeneration tower 21, after the ion-exchange resin transferred from the desalting tower 11 is separated from the ion-exchange resin by an air scrubbing operation, the clad or the like is separated from the ion-exchange resin, and the separated clad is discharged by a backwash operation. To separate the cation exchange resin C into the lower layer and the anion exchange resin A into the upper layer. Then, after transferring the anion exchange resin A to the anion regeneration tower 22 as described later, an acid regenerant is supplied from the distributor 21A, and the regeneration wastewater is discharged from a drain pipe (not shown) at the bottom of the tower. Play C. The cation exchange resin C after regeneration is washed with demineralized water or the like to wash off the acid regenerant.

  The anion regeneration tower 22 is connected to the cation regeneration tower 21 via a second resin transfer pipe 25. One of the second resin transfer pipes 25 is connected to a substantially intermediate portion of the cation regeneration tower 21 (a position where only the separated anion exchange resin A can be transferred), and the other is connected to the upper part of the anion regeneration tower 22. When transferring the anion exchange resin A from the cation regeneration tower 21 to the anion regeneration tower 22, the valve 25 </ b> A of the second resin transfer pipe 25 is opened, and water such as desalinated water supplied into the cation regeneration tower 21 is removed. The anion exchange resin A is transferred to the anion regeneration tower 22 via a second resin transfer pipe 25 by a gas such as air. Further, in the anion regeneration tower 22, a distributor 22A for supplying an alkali regenerant such as sodium hydroxide (sodium hydroxide is used in the present embodiment and the following embodiments) is provided. Therefore, when regenerating the anion exchange resin A in the anion regeneration tower 22, the alkali regenerant is supplied from the distributor 22A, and the wastewater is discharged from a drain pipe (not shown) at the lower part of the tower to remove the anion exchange resin A. After the regeneration, the anion exchange resin A is washed with deionized water or the like to remove sodium hydroxide.

  The storage tank 23 is connected to the cation regeneration tower 21 and the anion regeneration tower 22 via a third resin transfer pipe 26, respectively. One of the third resin transfer pipes 26 branches so as to reach the cation regeneration tower 21 and the anion regeneration tower 22, and each branch end is connected to a lower portion of both the regeneration towers 21 and 22, and the other is connected to the storage tank 23. ing. When transferring the cation exchange resin C and the anion exchange resin A from the cation regeneration tower 21 and the anion regeneration tower 22 to the storage tank 23, respectively, the valves 26A and 26B of the third resin transfer pipe 26 are opened, and The cation exchange resin C and the anion exchange resin A are respectively transferred to the storage tank 23 via the third resin transfer pipe 26 by water such as demineralized water and gas such as air supplied into the towers 21 and 22. . At this time, the anion exchange resin A in the anion regeneration tower 22 may be transferred to the storage tank 23 while leaving a part thereof, or may be entirely transferred. The storage tank 23 is connected to each of the desalination towers 11 via a fourth resin transfer pipe 27. One of the fourth resin transfer pipes 27 is connected to a lower part of the storage tank 23, and the other side is branched so as to reach each of the desalination towers 11, and each branch end is connected to an upper part of each of the desalination towers 11. In the storage tank 23, the cation exchange resin C and the anion exchange resin A are mixed to adjust the mixed ion exchange resin CA. The mixed ion exchange resin CA in the storage tank 23 is transferred to the empty desalination tower 11 through the fourth resin transfer pipe 27 using water such as demineralized water and gas such as air supplied to the inside. It is.

  Further, in the present embodiment, the anion regeneration tower 22 and each of the desalination towers 11 are connected via a fifth resin transfer pipe (resin transfer pipe for anion exchange resin) 28, respectively. One of the fifth resin transfer pipes 28 is connected to the upstream side of the valve 26B of the third resin transfer pipe 26, and the other is connected to the fourth resin transfer pipe 27 and connected to each of the desalination towers 11, and The anion exchange resin A in the anion regeneration tower 22 can be directly transferred to each desalting tower 11 alone via the transfer pipe 28. Therefore, the anion exchange resin A in the anion regeneration tower 22 is transferred to the desalination tower 11 via the fifth resin transfer pipe 28, and the lower layer of the ion exchange resin layer 14 made of the anion exchange resin A 14B can be formed.

  Next, an embodiment of a method for regenerating the ion-exchange resin in the desalination tower 11 that has reached the water-flow end point by using the regenerating equipment 20 and charging the regenerated ion-exchange resin into the desalination tower 11 will be described. This will be described with reference to FIG. For example, when the desalination tower 11 shown on the right side of FIG. 1 reaches the end of water flow, the ion exchange resin is regenerated. First, the valve 24A is opened, and all the ion exchange resins in the desalination tower 11 are transferred to the cation regeneration tower 21 via the first resin transfer pipe 24. After the transfer of the ion-exchange resin is completed, the desalination tower 11 that has been emptied is filled with the anion-exchange resin A in the anion regeneration tower 22 that has been regenerated and stored in advance by a method described below. The mixed ion exchange resin CA in 23 is transferred and filled as described later, and condensed water is passed again. After transferring the ion-exchange resin from the desalting tower 11, air scrubbing is performed in the cation regeneration tower 21 to remove deposits on the ion-exchange resin. C is separated into lower layers. Next, the valve 25A is opened, and the separated anion exchange resin A is transferred to the anion regeneration tower 22 via the second resin transfer pipe 25.

  Thereafter, in the cation regeneration tower 21, an acid regenerant is supplied from the distributor 21A into the cation regeneration tower 21, the cation exchange resin C is regenerated, and the regenerated cation exchange resin C is washed to remove the acid regenerant. In the anion regeneration tower 22, an alkali regenerant is supplied from the distributor 22A into the anion regeneration tower 22, the anion exchange resin A is regenerated, and the regenerated anion exchange resin A is washed to remove the alkali regenerant. After these operations, the cation exchange resin C in the cation regeneration tower 21 is transferred to the storage tank 23 via the third resin transfer pipe 26, and the anion exchange resin A in the anion regeneration tower 22 is also transferred to the third resin. It is transferred to the storage tank 23 via the pipe 26. At this time, a part of the anion exchange resin A is left in the anion regeneration tower 22, and if necessary, the anion exchange resin A remaining in the anion regeneration tower 22 is sufficiently washed. In the storage tank 23, the cation exchange resin C and the anion exchange resin A after the transfer are mixed and adjusted as a mixed ion exchange resin CA, and then transferred to the next desalination tower 11 (for example, the left desalination tower in FIG. 1). The mixed ion exchange resin CA is stored in the storage tank 23 until this time. During this time, it is preferable to wash the mixed ion exchange resin CA at appropriate intervals.

  When the next desalination tower 11 reaches the end of water flow and the recharged ion exchange resin regenerated as described above is filled in the desalination tower 11, the used ions in the desalination tower 11 are filled. After removing the exchange resin from the desalting tower 11 to the cation regeneration tower 21 as described above, first, the valve 27B of the fourth resin transfer pipe 27 and the valve 28A of the fifth resin transfer pipe 28 are opened, and the inside of the anion regeneration tower 22 is opened. All of the anion exchange resin A remaining in the desalination tower 11 is transferred to the desalination tower 11 via the fifth resin transfer pipe 28 and the fourth resin transfer pipe 27 for filling, and the anion exchange resin is previously placed in the lower part of the desalination tower 11. A lower layer 14B made of resin A is formed in advance. Subsequently, the valve 28A is closed, the valve 27A on the storage tank 23 side of the fourth resin transfer pipe 27 is opened, and all the mixed ion exchange resins CA in the storage tank 23 are desalted through the fourth resin transfer pipe 27. Then, the mixed ion exchange resin CA is stacked on the anion exchange resin A previously filled. As a result, in the ion exchange resin layer 14 of the desalination tower 11, the upper layer 14A is formed of the mixed ion exchange resin CA, and the lower layer 14B is formed of the anion exchange resin A. This means that the desalination tower 11 is configured.

  FIG. 3 is a diagram showing a regeneration equipment 20A according to another embodiment of the double tower regeneration system. As shown in the figure, the regeneration equipment 20A has a resin transfer pipe (fifth resin transfer pipe 28 in FIG. 1) for directly transferring the regenerated anion exchange resin A in the anion regeneration tower 22 to the desalination tower 11. It is not provided, and is configured so that all of the anion exchange resin A in the anion regeneration tower 22 is temporarily transferred to the storage tank 23 via the third resin transfer pipe 26, and is substantially in the middle of the storage tank 23. A sixth resin transfer pipe 50 (resin transfer pipe for anion exchange resin) provided with a valve 50A is connected to a portion (a position where only the separated anion exchange resin A can be transferred). The configuration is the same as that of the regenerating facility 20 except that one of the two is connected to the fourth resin transfer pipe 27. The reason why the sixth resin transfer pipe 50 is connected to the storage tank 23 in this way is that Na ions derived from the regenerant (NaOH) remaining in the anion exchange resin A after regeneration are converted into cations in the storage tank 23 as described later. This is for transferring to the desalting tower 11 the anion exchange resin A in which residual Na ions have been reduced by being taken away by the cation exchange resin C by mixing with the exchange resin C. By using such an anion exchange resin A with reduced residual Na ions as the lower layer 14A of the desalting tower 11, it is possible to prevent sodium leak from the anion exchange resin A in the lower layer 14B to the treated water during the passage of water. it can.

  A method of filling the ion exchange resin using the regeneration equipment 20A shown in FIG. 3 will be described. In the case of this method, the operation up to the regeneration is the same as the operation in the regeneration equipment 20, so only the filling operation after the regeneration will be described. In this embodiment, the regenerated cation exchange resin C regenerated in the cation regeneration tower 21 is transferred from the cation regeneration tower 21 to the storage tank 23 via the valve 26A and the third resin transfer pipe 26, All of the regenerated anion exchange resin A regenerated in the tank 22 is transferred from the anion regeneration tower 22 to the storage tank 23 via the valve 26B and the third resin transfer pipe 26, and both ion exchange resins C are stored in the storage tank 23. , A. Next, in the storage tank 23, the cation exchange resin C and the anion exchange resin A are mixed by, for example, stirring by blowing air, and Na ions derived from the regenerant remaining in the anion exchange resin A by the mixing operation are removed by the cation exchange resin C. It deprives and reduces Na ions remaining in the anion exchange resin A. By using the anion exchange resin A with reduced Na ions as the lower layer 14B of the ion exchange resin layer 14 as described later, sodium leak into the treated water can be more reliably prevented. After this mixing operation, the cation exchange resin C and the anion exchange resin A are separated again by backwashing in the storage tank 23. There are two methods for transferring the ion-exchange resin after separation to the desalination tower 11.

  In the first method, after the ion exchange resin is separated in the storage tank 23, first, a part of the anion exchange resin A is transferred to the storage tank 23 via the valve 50A, the sixth resin transfer pipe 50, and the fourth resin transfer pipe 27. The lower layer 14B made of the anion exchange resin A is formed in advance in the lower part of the desalination tower 11 by transferring it from 23 to the desalination tower 11 for filling. Next, the valve 50A is closed, the cation exchange resin C after separation and the remaining anion exchange resin A after separation are mixed in the storage tank 23 to adjust the mixed ion exchange resin CA, and then the valve 27A is opened. The ion-exchange resin CA is transferred from the storage tank 23 to the desalination tower 11 via the valve 27A and the fourth resin transfer pipe 27, and is stacked on the lower layer 14B of the anion-exchange resin A that has already been filled. An upper layer 14A made of resin CA is formed.

  Further, in the second method, almost all of the anion exchange resin A after separation is transferred to the desalting tower 11 in the same manner and filled therein, and the lower layer 14B made of the anion exchange resin A is previously placed below the desalting tower 11. It is formed. Next, the valve 50A is closed, and the cation exchange resin C remaining in the storage tank 23 is transferred from the storage tank 23 to the desalination tower 11 via the fourth resin transfer pipe 27, and is made of the anion exchange resin A already filled. The upper layer 14A made of the cation exchange resin C alone is formed by laminating on the lower layer 14B.

  FIGS. 4 and 5 are views showing still another regeneration equipment, and these regeneration equipments 120 and 120A are similar to the regeneration equipments 20 and 20A shown in FIGS. Although it is a two-tower regeneration system, it is a type that does not have a storage tank unlike the regeneration equipment shown in FIGS.

  The regeneration equipment 120 shown in FIG. 4 is a two-tower regeneration type regeneration equipment having no storage tank, and includes a cation regeneration tower 121 and an anion regeneration tower 122. The cation regeneration tower 121 and the desalination tower are connected by a first resin transfer pipe 123 so that the ion exchange resin that has reached the water flow end point via the first resin transfer pipe 123 is transferred from the desalination tower to the cation regeneration tower 121. It is. Further, the cation regeneration tower 121 and the anion regeneration tower 122 are connected by a second resin transfer pipe 124, and the anion exchange resin A washed and separated in the cation regeneration tower 121 via the second resin transfer pipe 124 is supplied to the cation regeneration tower 121. From the anion regeneration tower 122. The connection form of the first and second resin transfer pipes 123 and 124 is the same as that of the above-mentioned regenerating equipment.

  The anion regeneration tower 122 and the cation regeneration tower 121 are connected by a third resin transfer pipe 125. One of the third resin transfer pipes 125 is connected to a lower part of the anion regeneration tower 122, and the other is connected to an upper part of the cation regeneration tower 121. Is transferred to the cation regeneration tower 121. The cation regeneration tower 121 and the anion regeneration tower 122 are connected to each desalination tower via a fourth resin transfer pipe 126, respectively. One of the fourth resin transfer pipes 126 branches so as to reach one of the cation regeneration tower 121 and the anion regeneration tower 122, and each branch end is connected to a lower portion of both the regeneration towers 121 and 122, and the other is the case of FIG. In the same manner as described above, the water is branched to reach each desalination tower, and each branch end is connected to the upper part of each desalination tower. Note that 121A and 122A are distributors, and 124A, 125A, 126A and 126B are valves.

  Next, a method for filling the deionized tower with the regenerated ion exchange resin using the regenerating facility 120 will be described. After the regeneration of the cation exchange resin C and the anion exchange resin A is completed in each of the regeneration towers 121 and 122 of the regeneration facility 120, the valve 125A is opened, and the anion exchange resin A after the regeneration is passed through the third resin transfer pipe 125. A part thereof is transferred from the anion regeneration tower 122 to the cation regeneration tower 121. In the cation regeneration tower 121, after the anion exchange resin A is transferred, the cation exchange resin C and the anion exchange resin A are mixed by performing an air scrubbing operation or the like to adjust the mixed ion exchange resin CA. During the preparation of the mixed ion exchange resin CA, the valve 126B is opened, and the anion exchange resin A remaining in the anion regeneration tower 122 is transferred to the desalination tower via the fourth resin transfer pipe 126 and filled therein, and then desalted. A lower layer 14B made of an anion exchange resin A is formed at the bottom of the column (see the desalination column in FIG. 1). Next, the valve 126B is closed, the valve 126A is opened, and the mixed ion exchange resin CA adjusted in the cation regeneration tower 121 is transferred to the desalination tower via the fourth resin transfer pipe 126, and the mixed ion exchange resin CA is first transferred. Is laminated on the anion exchange resin A filled in the resin. When the upper layer of the ion exchange resin layer in the desalting tower is formed of the cation exchange resin C alone and the lower layer is formed of the anion exchange resin A, the anion exchange resin A is transferred from the anion regeneration tower 122 to the cation regeneration tower 121. First, all of the anion exchange resin A is transferred from the anion regeneration tower 122 to the desalination tower via the valve 126B and the third resin transfer pipe 126, and is charged. The cation exchange resin C may be transferred to the desalting tower via the valve 126A and the third resin transfer pipe 126, and the cation exchange resin C may be laminated on the anion exchange resin A.

  FIG. 5 is a diagram showing another regeneration equipment having no two storage tanks, similar to FIG. 4, and the same or corresponding parts as in FIG. 4 are denoted by the same reference numerals. In the case of the regeneration equipment 120A shown in FIG. 5, the fourth resin transfer pipe 126 is connected to the cation regeneration tower 121 by a fifth resin transfer pipe (anion exchange resin resin transfer pipe) 127 branched from the second resin transfer pipe 124. It is connected to each desalination tower through. Thereby, the anion exchange resin A after regeneration can be directly transferred from the cation regeneration tower 121 to the desalination tower as described later.

  Next, a method for filling the deionized tower with the ion-exchange resin after regeneration using the regeneration facility 120A will be described. After the regeneration of the cation exchange resin C and the anion exchange resin A is completed in each of the regeneration towers 121 and 122 of the regeneration facility 120A, the valve 125A is opened, and all the anion exchange resins A are anionized through the third resin transfer pipe 125. It is transferred from the regeneration tower 122 to the cation regeneration tower 121. In the cation regeneration tower 121, the mixed ion exchange resin CA is adjusted by air scrubbing operation or the like in the same manner as described above. After adjusting the mixed ion exchange resin CA, in the cation regeneration tower 121, the mixed ion exchange resin CA is separated into the cation exchange resin C and the anion exchange resin A by the backwashing operation again. Next, the valve 127A of the fifth resin transfer pipe 127 is opened, and a part or all of the anion exchange resin A after separation is transferred to the desalting tower via the fifth resin transfer pipe 127 and filled, and the anion exchange resin A is filled. Is formed in advance.

  When a part of the separated anion exchange resin A is transferred to the desalting tower, after the transfer operation, the remaining anion exchange resin A and the cation exchange resin C are mixed in the cation regeneration tower 121 by an air scrubbing operation or the like. Then, the mixed ion exchange resin CA is adjusted again. Next, the valve 126A is opened, and the mixed ion exchange resin CA is transferred from the cation regeneration tower 121 to the desalination tower via the fourth resin transfer pipe 126, and is stacked on the previously filled anion exchange resin A. An upper layer made of the resin CA is formed to form an ion exchange resin layer. When all of the anion exchange resin A after separation is transferred to the desalination tower, the cation exchange resin C in the cation regeneration tower 121 is desalted via the fourth resin transfer pipe 126 following the transfer operation. The mixture is transferred to a tower, the cation exchange resin C is laminated on the anion exchange resin A, and an upper layer made of the cation exchange resin C is formed on a lower layer made of the anion exchange resin A to form an ion exchange resin layer. In these filling methods, a mixing operation of the regenerated anion exchange resin A and the regenerated cation exchange resin C is performed before the regenerated anion exchange resin A is charged into the desalting tower, and the remaining amount of the anion exchange resin A remains. Since Na ions are deprived by the cation exchange resin C, it is possible to prevent sodium leak from the lower anion exchange resin A to the treated water during the desalination treatment. In the case of a condensate desalination apparatus that does not have a storage tank in the regeneration equipment as in the case of FIGS. 4 and 5, the used ion exchange resin is supplied to the regeneration equipment from the desalination tower that has reached the end point of water flow. An operation method such as transporting and regenerating the ion-exchange resin and returning the regenerated ion-exchange resin to the same desalting tower again, and stopping the operation of the desalting tower during the regenerating operation is adopted. can do.

  FIG. 6 is a diagram showing a regeneration facility 220 which is a single-column regeneration type regeneration facility and does not have a storage tank for the ion-exchange resin after regeneration in the regeneration facility. As shown in the figure, the regeneration equipment 220 includes one regeneration tower 221. Therefore, a distributor 221A for supplying an alkali regenerant on the upper part of the ion exchange resin layer and a collector 225 for discharging a regeneration waste liquid near the separation boundary between the cation exchange resin C and the anion exchange resin A are provided in the regeneration tower 221. Further, an acid regenerant supply pipe 226 for supplying an acid regenerant is provided below the regeneration tower 221. In addition, the regeneration tower 221 and the desalination tower are connected by a first resin transfer pipe 222, and the ion exchange resin that has reached the water flow end point via the first resin transfer pipe 222 is transferred from the desalination tower to the regeneration tower 221. It is. Further, the lower part of the regeneration tower 221 and the upper part of each desalination tower are connected by a second resin transfer pipe 223, and the ion exchange resin regenerated in the regeneration tower 221 via the second resin transfer pipe 223 is transferred from the regeneration tower 221 to each of them. It is transferred to a desalination tower. In addition, a substantially intermediate part of the regeneration tower 221 (near the separation boundary between the cation exchange resin C and the anion exchange resin A) and the upper part of each desalination tower are connected via a third resin transfer pipe (resin transfer pipe for anion exchange resin) 224. Connected. 223A and 224A are valves.

  Next, a method for filling the deionized tower with the regenerated ion exchange resin using the regenerating facility 220 will be described. The method of regenerating the ion-exchange resin transferred from the desalting tower to the regenerating tower 221 is the same as the conventional method, and the description thereof is omitted. To fill the ion exchange resin into the desalination tower, first, the valve 224A is opened, and part or all of the upper layer anion exchange resin A in the regeneration tower 221 separated by the regeneration operation is passed through the third resin transfer pipe 224. The lower layer made of the anion exchange resin A is formed in advance in the lower part of the desalting tower by transferring it from the regenerating tower 221 to the desalting tower for filling. When a part of the anion exchange resin A is transferred, after performing the transfer operation of the anion exchange resin A, the cation exchange resin C and the remaining anion exchange resin A are mixed in the regeneration tower 221. The valve 223A is opened, the mixed ion exchange resin CA is transferred from the regeneration tower 221 to the desalination tower via the second resin transfer pipe 223, and is stacked on the anion exchange resin A. Formed to form an ion exchange resin layer. When all the anion exchange resins A have been transferred, the cation exchange resin C in the regeneration tower 221 is transferred through the second resin transfer pipe 223 after the transfer operation of all the anion exchange resins A is performed. 221 is transferred to a desalting tower and laminated on a lower layer made of an anion exchange resin A, and an upper layer made of a cation exchange resin C is formed as an ion exchange resin layer.

  Further, another filling method using the regeneration equipment 220 shown in FIG. 6 will be described. In the above-described method, first, the separated and regenerated anion exchange resin A in the regeneration tower 221 was transferred to the desalting tower. However, in the case of the method described below, first, the separated and regenerated cations in the regeneration tower 221 were separated. The exchange resin C and the anion exchange resin A are mixed by an air scrubbing operation or the like, and after this mixing operation is performed, the cation exchange resin C and the anion exchange resin A are separated again. By this operation, residual Na ions of the anion exchange resin A after regeneration are deprived by the cation exchange resin C, and thus, when the lower layer of the desalting tower is formed by the anion exchange resin A subjected to such operation, the It is possible to prevent sodium leak from the anion exchange resin A into the treated water. Subsequent operations are the same as those described above. In the above example, a single-column regeneration system having no storage tank in the regeneration facility was described. However, in the case of a single-column regeneration system having a storage tank, both ion exchange resins regenerated in the regeneration tower were used. Once transferred to a storage tank, both ion exchange resins are separated in this storage tank, and then regenerated ion exchange resin is transferred in the same manner as when transferring the resin from the regeneration tower to the desalination tower as described above. The resin may be transferred from the storage tank to the desalination tower.

  In addition, the present invention is not limited to the above embodiments. In summary, in order to reduce the eluate from the cation exchange resin, a layer of the anion exchange resin alone is surely formed in the lower layer of the desalting tower. Any method and apparatus that can be included in the present invention.

  Next, when the method of filling an ion exchange resin in the condensate desalination apparatus of the present invention is used, leakage of organic substances from the cation exchange resin can be prevented or suppressed, and leakage of Na ions can be prevented. Was demonstrated experimentally. This will be described below.

Example 1
In this example, a cation exchange resin (Amberlite (registered trademark, the same applies hereinafter) 200CP: manufactured by Rohm & Haas Co.) and an anion exchange resin (Amberlite IRA-900CP) used in a condensate desalination unit of a power plant for about 2 years. ) Was regenerated under the conditions shown in Table 1, and then an acrylic column having an inner diameter of 32 mm and a length of 1500 mm was first filled with 170 mL of anion exchange resin (resin layer height about 200 mm), and A mixed ion exchange resin obtained by mixing 660 mL of the cation exchange resin and 170 mL of the anion exchange resin was filled.

  Next, condensed water having an ammonia concentration of 500 ppb and a hydrazine concentration of 200 ppb was passed through the column at a linear velocity (LV) of 80 m / hour. One hour and three hours after the start of water passage, the treated water was sampled, and the conductivity and TOC (total organic matter concentration) of each sampled water were measured. Further, each sample water was irradiated with ultraviolet rays to decompose organic substances contained in each sample water, and the concentration of sulfate ions in the decomposition solution was measured. Table 2 shows the measurement results.

Example 2
In this example, after regenerating the same ion exchange resin as used in Example 1 under the same conditions, 340 mL of anion exchange resin was applied to the same column as used in Example 1 (resin layer height about 400 mm). ), And 660 mL of the cation exchange resin was filled in the upper portion thereof, and a water flow test was performed under the same conditions as in Example 1. Then, during the passage of water, sampled water was collected under the same conditions as in Example 1, and the same measurement as in Example 1 was performed for each sampled water. The results are shown in Table 2.

Comparative Example In this comparative example, after regenerating the same ion exchange resin as that used in Example 1 under the same conditions, a mixed ion exchange resin obtained by mixing 340 mL of anion exchange resin and 660 mL of cation exchange resin was prepared. did. Next, the same column as used in Example 1 was filled with the mixed ion-exchange resin, and then a water flow test was performed under the same conditions as in Example 1. The results are shown in Table 2.

  According to the results shown in Table 2, in the case of Examples 1 and 2 where the anion exchange resin was filled in the lower part of the column, the TOC concentration in the treated water and the sulfate ion concentration after decomposition by ultraviolet irradiation were compared with those of the comparative example. It was found that it was reduced.

Example 3
In this example, the same ion exchange resin as used in Example 1 was regenerated under the same conditions, and then packed in an acrylic column having an inner diameter of 48.5 mm and a length of 1000 mm, and air was introduced from the bottom for 5 minutes. The cation exchange resin and the anion exchange resin were mixed. After completion of the mixing, the mixture was allowed to stand by for about one hour, and then pure water was passed through the lower part of the column for about 30 minutes to backwash and separate the anion exchange resin and the cation exchange resin. Thereafter, the same column as that used in Example 1 was first filled with the separated anion exchange resin 340 mm, and the upper portion thereof was filled with the separated cation exchange resin 660 mm, and a water flow test was performed under the same conditions as in Example 1. went. Then, the measurement of Na ions in the sampling water at the outlet of the column at the time of passing water was performed, and the results are shown in Table 3 and FIG. Also, for comparison, in Examples 1 and 2, Na ions in the sampling water at the column outlet were measured in the same manner, and the results are shown in Table 3 and FIG.

  According to the results shown in Table 3 and FIG. 7, after the cation exchange resin and the anion exchange resin after regeneration are once mixed, both ion exchange resins are separated again, and then packed into a column, so that Na at the time of passing water is obtained. It was found that the amount of ion leakage was reduced.

  INDUSTRIAL APPLICATION This invention can be utilized suitably for the condensate desalination apparatus which performs the desalination process of the condensate of a thermal power plant or a nuclear power plant.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows one Embodiment of the condensate desalination apparatus which can apply suitably the filling method of the ion exchange resin in the condensate desalination apparatus of this invention. (A) is a block diagram showing a configuration of a lower portion of the desalination tower shown in FIG. 1, and (b) is a configuration diagram showing a lower portion of another desalination column. It is a block diagram which shows the regeneration equipment of other embodiment of the condensate desalination apparatus which can apply suitably the filling method of the ion exchange resin in the condensate desalination apparatus of this invention. It is a block diagram which shows the regeneration equipment of further another embodiment of the condensate desalination apparatus which can apply suitably the filling method of the ion exchange resin in the condensate desalination apparatus of this invention. It is a block diagram which shows the regeneration equipment of further another embodiment of the condensate desalination apparatus which can apply suitably the filling method of the ion exchange resin in the condensate desalination apparatus of this invention. It is a block diagram which shows the regeneration equipment of further another embodiment of the condensate desalination apparatus which can apply suitably the filling method of the ion exchange resin in the condensate desalination apparatus of this invention. It is a graph which shows the leak of Na ion in a present Example.

Explanation of reference numerals

10 Condensate desalination device 11 Desalination tower 14 Ion exchange resin layer 14A Upper layer (upper ion exchange resin layer)
14B Lower layer (lower ion exchange resin layer)
20, 20A, 120, 120A, 220 Regeneration equipment 28, 50, 126, 127, 224 Resin transfer piping for anion exchange resin

Claims (8)

  The used cation exchange resin and the anion exchange resin in the desalination tower of the condensate desalination apparatus are transferred to a regeneration facility, and after regenerating each ion exchange resin in the regeneration facility, each of the regenerated ion exchange resins is recycled. In the method of transferring from the regeneration equipment to the desalination tower and filling the same, the cation exchange resin and the anion exchange resin regenerated by the regeneration equipment are charged into the desalination tower. A part or all of the resin is transferred to the desalting tower and packed, and then, when a part of the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin are mixed in the regenerating equipment, and this mixing is performed. The ion exchange resin is transferred from the regeneration equipment to the desalting tower and laminated on the anion exchange resin, and when all the anion exchange resins are transferred, the cation exchange resin is removed. Filling method of the ion exchange resin in the condensate demineralizer, which comprises laminating to said reproduction equipment from the transport into the demineralizer the anion exchange on resin in Germany.   The used cation exchange resin and the anion exchange resin in the desalination tower of the condensate desalination apparatus are transferred to a regeneration facility, and after regenerating each ion exchange resin in the regeneration facility, each of the regenerated ion exchange resins is recycled. In the method of transferring from the regeneration facility to the desalination tower and filling the cation exchange resin and the anion exchange resin regenerated by the regeneration facility into the desalination tower, the After mixing the exchange resin and the anion exchange resin, the mixture is again separated into a cation exchange resin and an anion exchange resin, and then a part or all of the anion exchange resin after separation from the regeneration equipment is transferred to the desalting tower for filling. Then, when a part of the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin are mixed, and the mixed ion exchange resin is separated from the regeneration equipment. When transferred to the desalination tower and laminated on the anion exchange resin, and when all the anion exchange resins have been transferred, the cation exchange resin alone is transferred from the regeneration equipment to the desalination tower and transferred to the desalination tower. A method for charging an ion exchange resin in a condensate desalination apparatus, wherein the ion exchange resin is stacked on top.   The used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination apparatus were transferred to a regeneration facility, and the above-mentioned ion exchange resins were individually regenerated in the first and second regeneration towers of the regeneration facility. Thereafter, in the method of transferring and filling each ion-exchange resin after regeneration from the first and second regeneration towers to the desalination tower via the storage tank, the cation exchange resin and the anion exchange resin regenerated by the regeneration equipment When the resin is filled in the desalting tower, the regenerated cation exchange resin is transferred from the first regeneration tower to the storage tank, and the regenerated anion exchange resin is removed from the second regeneration tower while leaving a part of the anion exchange resin. Transferring from the regeneration tower to the storage tank, mixing the cation exchange resin and the anion exchange resin in the storage tank, and removing the anion exchange resin remaining in the second regeneration tower from the second regeneration tower. Transferring the mixed ion-exchange resin from the storage tank to the desalination tower and stacking the mixed ion-exchange resin on the anion exchange resin. Filling method of ion exchange resin.   The used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination apparatus were transferred to a regeneration facility, and the above-mentioned ion exchange resins were individually regenerated in the first and second regeneration towers of the regeneration facility. Thereafter, in the method of transferring and filling each ion-exchange resin after regeneration from the first and second regeneration towers to the desalination tower via the storage tank, the cation exchange resin and the anion exchange resin regenerated by the regeneration equipment Transferring the regenerated cation exchange resin from the first regeneration tower to the storage tank and transferring the regenerated anion exchange resin from the second regeneration tower to the storage tank when filling the resin into the desalination tower; And mixing the cation exchange resin and the anion exchange resin in the storage tank, and then separating the cation exchange resin and the anion exchange resin again, and part or all of the separated anion exchange resin Transferring from the storage tank to the desalination tower and filling, and when transferring some anion exchange resin, the cation exchange resin after separation and the remaining anion exchange resin after separation in the storage tank After mixing, the cation exchange resin after separation from the storage tank is transferred alone from the storage tank to the desalination tower and stacked on the anion exchange resin when all the anion exchange resins are transferred. Transferring the mixture to a desalination tower and laminating it on an anion exchange resin.   The used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination apparatus were transferred to a regeneration facility, and the above-mentioned ion exchange resins were individually regenerated in the first and second regeneration towers of the regeneration facility. After, in the method of transferring each ion-exchange resin after regeneration from the regeneration tower directly to the desalination tower and filling the same, the cation-exchange resin and the anion-exchange resin regenerated by the regeneration equipment are charged into the desalination tower. Transferring the regenerated anion exchange resin from the second regeneration tower to the first regeneration tower while leaving a portion of the anion exchange resin; and transferring the anion exchange resin after the transfer to the cation exchange resin in the first regeneration tower. And after the anion exchange resin remaining in the second regeneration tower is transferred to the desalting tower and filled, the mixed ion exchange resin in the first regeneration tower is transferred to the desalting tower and anion exchange is performed. Laminate on exchange resin Filling method of the ion exchange resin in the condensate demineralizer apparatus characterized by a step.   The used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination apparatus were transferred to a regeneration facility, and the above-mentioned ion exchange resins were individually regenerated in the first and second regeneration towers of the regeneration facility. After, in the method of transferring each ion-exchange resin after regeneration from the regeneration tower directly to the desalination tower and filling the same, the cation-exchange resin and the anion-exchange resin regenerated by the regeneration equipment are charged into the desalination tower. Transferring the regenerated anion exchange resin from the second regeneration tower to the first regeneration tower; mixing the cation exchange resin and the transferred anion exchange resin in the first regeneration tower; A step of separating the anion exchange resin into an anion exchange resin, a step of transferring a part or all of the anion exchange resin in the first regeneration tower to the desalting tower and filling the same, and a step of transferring a part of the anion exchange resin when a part of the anion exchange resin is transferred. 1 regeneration tower After mixing the cation exchange resin after the separation and the remaining anion exchange resin after the separation, the mixture was transferred from the first regeneration tower to the desalting tower, laminated on the anion exchange resin, and all the anion exchange resins were transferred. Wherein the cation exchange resin separated from the first regeneration tower is transferred alone to the desalting tower and laminated on the anion exchange resin. Filling method.   The used cation exchange resin and the anion exchange resin in the desalination tower of the condensate desalination apparatus are transferred to the regeneration equipment, and each of the ion exchange resins is regenerated in one regeneration tower of the regeneration equipment. In the method of transferring and filling each ion exchange resin from the regeneration tower to the desalination tower, when the cation exchange resin and the anion exchange resin regenerated in the regeneration tower are charged into the desalination tower, the regeneration is performed. A step of transferring a portion or all of the separated anion exchange resin after regeneration in the column from the regeneration column to the desalination column to fill the column, and when a part of the anion exchange resin is transferred, The cation exchange resin and the remaining anion exchange resin are mixed in, and the mixed ion exchange resin is transferred from the regeneration tower to the desalination tower, laminated on the anion exchange resin, and all the anion exchange resins are transferred. Filling method of the ion exchange resin in the condensate demineralizer, characterized in that a step of laminating a cation exchange resin in the regeneration tower on the anion exchange resin was transferred to the demineralizer for.   The used cation exchange resin and anion exchange resin in the desalination tower of the condensate desalination unit were transferred to a regeneration facility, and the above ion exchange resins were separated and regenerated individually in one regeneration tower of the regeneration facility. Thereafter, in the method of transferring and filling each ion exchange resin after regeneration from the regeneration tower to the desalination tower, the cation exchange resin and the anion exchange resin regenerated in the regeneration tower are filled in the desalination tower. At this time, a step of mixing the separated cation exchange resin and the anion exchange resin after regeneration in the regeneration tower, and then separating the cation exchange resin and the anion exchange resin again, and the separated anion exchange resin in the regeneration tower Transferring and filling a part or all of the anion exchange resin from the regeneration tower to the desalination tower; and, when a part of the anion exchange resin is transferred, the cation exchange resin and the remaining anion exchange resin in the regeneration tower. The ion exchange resin is mixed, and the mixed ion exchange resin is transferred from the regeneration tower to the desalting tower and stacked on the anion exchange resin. When all the anion exchange resins are transferred, the cations in the regeneration tower are transferred. Transferring the exchange resin to the desalting tower and laminating the resin on the anion exchange resin.

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