JPH1199311A - Method for operating condensate filtration column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rapid difference pressure increase of a non-precoating type filter element and to prolong an element life by previously precoating the filter element used for a condensate filtration column with filter aids in the period up to a stationary operation through a cleanup operation period after a periodic inspection. SOLUTION: A slurry of a regulating vessel 11 is passed from an inflow pipe 51a through a pleat type cartridge filter 56 of an upper chamber 52 from outside to inside to precoat the surface of the filter 56 with powder ion exchange resins at the time of starting after the periodic inspection of a power plant. The condensate is filtered and desalted by the filter 56 of the upper chamber 52 through condensate piping 9B and the inflow port 51A by the clean-up operation of the power plant. A large amt. of the metal clad and TOC components in the condensate are captured and removed by the precoating layer of the filter 56, by which the clogging of the filter membrane is eliminated. The filter 56 is backwashed to remove the precoating layer by one column each of the filtration columns 5 by the stationary operation of the plant. These layers are discharged through drain piping 17. The rapid difference pressure rise is prevented and the life of the filter may be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a condensate filtration tower disposed upstream of a condensate desalination tower of a power plant such as a nuclear power plant or a thermal power plant.
The present invention relates to a method for operating a condensate filtration tower that can reduce waste generated during backwashing of the condensate filtration tower.

[0002]

2. Description of the Related Art Conventionally, in a power plant such as a nuclear power plant or a thermal power plant, steam is produced by utilizing nuclear power or thermal power, and the steam is used to drive a power generation turbine to generate power. For example, in a boiling water nuclear power plant (BWR), as shown in FIG. 5, steam generated in a nuclear reactor 1 is sent to a high-pressure turbine 2 and a low-pressure turbine 3 in this order, and
Is rotating the generator. Then, the steam after power generation is cooled by the condenser 4 to be condensed, and the condensed water is sent to the condensate filtration tower 5 and the condensate desalination tower 6 in this order, and the equipment such as the reactor 1 and piping such as piping. After the metal clad such as iron oxide fine particles generated from the material is removed in the condensate filtration tower 5 and then various ion components such as Fe ions and Cu ions are removed in the condensate desalination tower 6, the condensate is removed from the reactor. I send it to 1. Before supplying the condensate to the reactor 1, the high-pressure turbine 2 and the low-pressure turbine 3
A part of each steam is supplied to the low-pressure heater 7 and the high-pressure heater 8 to heat the condensate. In FIG. 5,
9A shown by a broken line is a steam pipe, 9B shown by a solid line is a condensate pipe, and 10A, 10B, and 10C are all water supply pumps.

Conventionally, as the condensate filtration tower 5, for example, a condensate filtration tower using a precoat type filter element in which a filter aid such as a powdered ion exchange resin is precoated on the surface of a filter medium, and a number of hollow fiber membrane filters are used. A condensate filtration tower using a bundled hollow fiber membrane type filter element is used. In the case of the former pre-coat type condensate filtration tower,
A filter desalination process is performed to remove a part of impurity ions and metal clad such as iron oxide fine particles in the condensate.However, as the treatment time elapses, the differential pressure of the filter increases, Since the desalting function of the condensate decreases, the condensate filtration tower is backwashed and regenerated when such a phenomenon appears.
This backwashing regeneration operation is usually performed about 4 to 10 times a year. In particular, boiling water nuclear power plants (hereinafter referred to as "B
WR ". In the case of (2), a used powder ion exchange resin contaminated with a radioactive substance is generated as radioactive waste every time the backwash regeneration operation is performed. On the other hand, in the latter case, the filter aid is not required in the case of the hollow fiber membrane type condensate filtration tower, so that radioactive materials such as used powder ion exchange resin generated during backwashing regeneration of the precoat type condensate filtration tower are used. Since no waste is generated, a hollow fiber membrane type condensate filtration tower is used in a recently constructed BWR.

[0004] Most of the existing BWRs are provided with a pre-coat type condensate filtration tower. In order to completely switch the pre-coat type condensate filtration tower to a non-pre-coat type condensate filtration tower such as a hollow fiber membrane type, since the structures of both filter tower bodies are completely different, the entire apparatus including the filter tower body is required. The tower must be renewed or the tower itself needs to be remodeled significantly, which makes the economic burden excessive. Therefore, in order to reduce the economic burden, it is desirable to switch to a non-precoated filter element with compatibility with the precoated filter element with almost no modification of the structure of the tower body.

[0005]

However, even if the pre-coated filter element is switched to be compatible with a non-pre-coated filter element (for example, a pleated filter), after the power plant is periodically inspected, the power plant is not replaced. During the period from the clean-up operation period to the steady operation, the pressure difference rises sharply, and furthermore, the metal clad clogs the pleated filter, lowers the backwashing property and adversely affects the life of the filter. There was a problem that. That is, during the normal operation of the power plant, the concentration of the metal clad and the concentration of the TOC in the condensate are both of the order of as low as about 20 ppb, but the maximum is reached during the period from the cleanup operation period after the periodic inspection to the steady operation. Metal cladding of about 1000 ppb or several hundred
Water containing about ppb of TOC component is treated.
The metal clad generated during the period from the cleanup operation period after the periodic inspection to the steady operation is, for example, about 30% of the metal clad amount generated during the plant operation cycle of about one year until the next periodic inspection. %, And this large amount of metal clad concentrates at the time of start-up and about one week of the clean-up operation period, during which the pressure difference rapidly rises, the backwashing property decreases, and the filter element There was a problem of shortening the life of the device. Note that the steady operation means an operation in a state where the power generation output of the power plant has reached its original power generation output, and the same applies to the following description.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can prevent a sudden increase in the differential pressure of a non-precoated filter element and can reduce the amount of water used during backwashing. It is an object of the present invention to provide a method for operating a condensate filtration tower, which can extend the life of the filter and can significantly reduce the amount of used precoat agent.

[0007]

According to a first aspect of the present invention, there is provided a method of operating a condensate filtration tower, comprising the steps of: operating a condensate filtration tower disposed downstream of a condenser; During the period from the cleanup operation period to the steady operation, the filter element used in the condensate filtration tower is precoated with a filter aid.

[0008] A method of operating a condensate filtration tower according to claim 2 of the present invention is characterized in that, in the invention according to claim 1, a pleated filter is used as the filter element.

The method of operating a condensate filtration tower according to claim 3 of the present invention is the method according to claim 1 or 2, wherein the filter element has a pleat compatible with a precoat type filter element. It is characterized by using a type filter.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. In each figure, FIG.
1 is a configuration diagram showing a condensate filtration device used in an embodiment of a method for operating a condensate filtration tower according to the present invention. FIG. 2 is a diagram showing a filter element shown in FIG. Sectional view of main part showing structure for attachment to main body, (b)
3 is a perspective view showing a seal adapter used when the filter element is attached to the main body of the filtration tower, FIG. 3 is an exploded perspective view showing a part of the filter element shown in FIG. 2, and FIG. 4 is a condensate filtration of the present invention. It is a graph which shows the relationship between the operating days of a filter element and the water pressure difference of a filter element in the operation method of an apparatus.

First, a condensate filtration apparatus used in the method for operating a condensate filtration tower according to the present invention will be described. As shown in FIG. 1, the condensate filtration device includes a condensate filtration tower 5 and an adjustment tank 11. After a periodical inspection, a period from a cleanup operation period to a normal operation is reached. The filter aid adjusted inside is introduced into the condensate filtration tower, and the filter aid is pre-coated on the filter element of the condensate filter. Examples of the filter aid include ion exchange resin, ion exchange resin fiber, cellulose fiber, acrylic fiber and the like. In this embodiment, a case where a powder ion exchange resin is used as a filter aid will be described. FIG.
Although only one condensate filtration tower 5 is shown in FIG. 1, usually, several towers are arranged in parallel.

As shown in FIGS. 1 and 2, the condensate filtration tower 5 has a tower body 51 and a partition wall (hereinafter, “tube sheet”) that divides the tower body 51 into an upper chamber 52 and a lower chamber 53. A plurality of (for example, several tens to several hundreds) standing tubes are provided on the tube sheet 54 at predetermined intervals and communicate with the upper chamber 52 and the lower chamber 53 (hereinafter referred to as “tube”). ) 55, and filter elements 56 (hereinafter, referred to as “pleated cartridge filters”) 56 erected at the upper ends of these tubes 55 in the upper chamber 52 via a pressing and fixing mechanism 60 described later. It has. At the center of the tube sheet 54, an inflow pipe 51A into which condensate flows is attached. The inflow pipe 51A penetrates the bottom of the tower body 51 and is connected to a condensate pipe 9B. A baffle plate (not shown) is horizontally disposed above the outlet of the inflow pipe 51A, and a draft tube is erected at the center of the baffle plate. Inflow water flows into the upper chamber 52 through the baffle plate and the draft tube. They are evenly distributed throughout. Also,
An outflow pipe 51B through which the treated water flows out is attached to the bottom of the tower body 51, and the outflow pipe 51B is connected to a condensate pipe 9B leading to the condensate and desalination tower 6. In FIG. 1,
Reference numeral 51C denotes an overflow pipe, whose valve 51D is opened when the inside of the tower body 51 is filled with water.

The adjusting tank 11 adjusts a slurry by adding pure water to a powdered ion exchange resin as a filter aid using a stirrer 11A, and supplies the slurry into an upper chamber 52 of a tower body 51. The mold cartridge filter 56 is pre-coated with a powder ion exchange resin. That is, the slurry supply pipe 12 of the adjustment tank 11
Is connected to the condensate pipe 9B on the inflow pipe 51A side as shown in FIG. 1 and supplies the slurry in the adjustment tank 11 to the upper chamber 52 via the pump 13 as shown by the dashed arrow, and the pleated cartridge filter 56 is precoated with a powdered ion exchange resin. Further, a collection pipe 14 for collecting entrained water of the slurry is connected to the outflow pipe 51B side,
The collection pipe 14 branches in two directions immediately before the adjustment tank 11. One branch pipe 14A is connected to the adjustment tank 11, and the other branch pipe 14B is located between the adjustment tank 11 and the pump 13, and is connected to the slurry supply pipe 12. A backwash pipe 15 for supplying backwash water or backwash air upstream of the branch pipes 14A and 14B of the recovery pipe 14.
1 is supplied to the lower chamber 53 of the tower main body 51 by using the pump 16 to supply backwashing water or backwashing air as indicated by an alternate long and short dash line arrow in FIG. The precoated powder ion exchange resin is peeled and removed. In addition, a drain pipe 17 is connected to the inflow pipe 51A side, and drain water, backwash wastewater, and the like of the condensate filtration tower 5 are discharged from the drain pipe 17 to the outside of the system. Further, the slurry supply pipe 1
A circulation pipe 18 is connected to the collection pipe 14 and the collection pipe 14, and the holding water in the tower main body 51 is circulated by the holding pump 19, so that the powder ion-exchange resin precoated on the surface of the pleated cartridge filter 56 is turned off when the filtration tower is stopped. It does not peel off from the pleated cartridge filter 56. In FIG. 1, 12A, 14
C, 15A, 17A and 18A are valves for adjusting the flow rate of each pipe.

The pleated cartridge filter 56 is mounted via a pressing and fixing mechanism 60 so as to be compatible with a conventional pre-coated filter element. Therefore, the mounting structure of the pleated cartridge filter 56 to the tower body 51 will be described with reference to FIG. That is, as shown in FIG. 2A, the pressing and fixing mechanism 60 includes a guide rod 61 that penetrates along the axis of the pleated cartridge filter 56,
A first receiving member 62 attached to an upper portion of the guide rod 61; and a second receiving member 63 disposed at an upper end of the first receiving member 62 and the pleated cartridge filter 56.
A spring member 64 interposed therebetween and the lower end of the guide rod 61 are locked to the mounting adapter 58 in a state where the spring member 64 is charged, and the pleated cartridge filter 56 is pressed and fixed to the mounting adapter 58. And a lock pin 66. In addition, a small gasket (not shown) is interposed between the second receiving member 63 and the spring member 64 to prevent leakage of the water to be treated from near the guide rod 61 into the filter. The mounting adapter 58 is a guide rod 61
Has a through hole having a size through which the lower end portion passes, and a cutout (not shown) through which the lock pin 66 passes is formed in this through hole. The seal adapter 59 described above is interposed between the lower surface of the pleated cartridge filter 56 and the mounting adapter 58. Gaskets 67 and 67A are respectively interposed between the second receiving member 63 and the upper end surface of the pleated cartridge filter 56 and between the lower end surface and the seal adapter 591. Also,
The guide rod 61 includes a rod body 61A and an elongated nut member 61 that is screwed at an upper end of the rod body 61A.
B, and the first receiving member 62 is locked at the lower end surface of the nut member 61B.

A seal adapter 59 shown in FIG. 2B is provided between the pleated cartridge filter 56 and the mounting adapter 58 as an interface member. As shown in the figure, the seal adapter 59 has a ring-shaped adapter main body 591 fitted to the mounting adapter 58, and a seal member 592 mounted on a surface of the adapter main body 591 on the mounting adapter side. doing. A slightly deep concave portion (not shown) is formed on the lower surface of the adapter main body 591 so as to be in pressure contact with the ring-shaped projection 58A of the mounting adapter 58 via a seal member 592 fitted in the concave portion. . Adapter body 5
A slightly shallow concave portion 591A is formed on the upper surface of 91, and is pressed against the lower surface of the pleated cartridge filter 56 by a peripheral ring-shaped protrusion 591B.

The pleated cartridge filter 56 is configured as shown in FIG. That is, as shown in the drawing, the pleated cartridge filter 56 has a cylindrical filter body 562 formed by folding a filtration membrane 561 with a constant folding width and formed into a pleated shape. Cylindrical support that is supported on the peripheral surface
Called “core”. ) 563, a cylindrical protective body 564 covering the outer peripheral surface of the filter 562, and a pair of end plates 5 for fixing both ends thereof in a cylindrical shape.
65. And, on the peripheral surface of the core 563,
Numerous small-diameter openings for collecting the filtered water filtered by the filter 562 into the inner space of the core 563 are dispersedly formed, and the protector 564 is formed by a water-permeable member such as a net, for example. Have been.

As shown in FIG. 3, for example, the filtration membrane 561 includes a nonwoven fabric 561A made of, for example, polypropylene having a filtering function, a support net 561B covering the inner surface of the nonwoven fabric 561A, and a span covering the outer surface of the nonwoven fabric 561A. It is formed with the bond 561C. The support net 561B keeps the pleated form of the filtration membrane 561 and prevents the inner surfaces of the filtration membrane 561 from adhering to each other. The spunbond 561C prevents the outer surfaces of the filtration membrane 561 from adhering to each other.

The pleated cartridge filter 56
Since the filter membrane 561 is formed into a cylindrical shape by being pleated, the filter membrane 561 is formed to have a larger outer diameter than the precoated filter element, and is larger than the inner diameter of the mounting adapter 58. Therefore, there is no compatibility between the two, and the pleated cartridge filter 56 cannot be directly attached to the attachment adapter 58 in which the pre-coated filter element is fitted. Therefore, in the present embodiment, the aforementioned seal adapter 59 is used as an interface member for mounting the pleated cartridge filter 56 to the mounting adapter 58 so that the pleated cartridge filter 56 can be mounted as it is without modifying the basic structure of the tower main body 51.
Is provided.

In the present embodiment, for example, after a periodic inspection of the power plant, the condensate filtration tower is operated as follows when the plant is started. That is, first, for example, pure water is supplied in a state where the valve 51D of the overflow pipe 51C is opened, and the inside of the tower body 51 is filled with water. Next, the overflow pipe 51
When the C valve 51D is closed, the valves 12A and 14C are opened, and the pump 13 is driven to supply the slurry in the adjustment tank 11 through the slurry pipe 12 from the inflow pipe 51A into the upper chamber 52, the slurry flows into the upper chamber 51. The ion-exchange resin is pre-coated on the surface of each pleated cartridge filter 56 while the accompanying water permeates through each pleated cartridge filter 56 from outside to inside.
Part of the entrained water that has passed through each pleated cartridge filter 56 returns to the adjustment tank 11 via the recovery pipe 14,
The rest returns to the slurry supply pipe 12. Subsequently, the slurry in the adjustment tank 11 is supplied to the upper chamber 52 of the tower body 51 via the slurry supply pipe 12, and each pleated cartridge filter 56 is pre-coated with the powder ion exchange resin. When a predetermined amount of the powdered ion exchange resin is precoated on each pleated cartridge filter 56, the pump 13 is stopped, the valves 12A and 14C are closed, and the valve 18A is opened.
9 is driven to circulate the water in the tower main body 51, and the powder ion exchange resin is held on the surface of the pleated cartridge filter 56 of each pleated cartridge filter 56.

Thereafter, a cleanup operation of the power plant is performed. At the same time as the condensate of the power plant is introduced into the condensate filtration tower 5, the holding pump 19 is stopped.
Subsequently, the condensate flows into the upper chamber 52 of the tower main body 51 via the condensate pipe 9B and the inflow pipe 51A, and is filtered and desalinated by each pleated cartridge filter 56, and is then condensed.
5, the water reaches the lower chamber 53, and is supplied to the downstream condensate desalination tower via the outflow pipe 51B and the condensate pipe 9B. Therefore, during the period from the cleanup operation period after the periodic inspection to the steady operation, even if a large amount of metal clad or TOC component is contained in the condensate water, these are formed on the surface of the pleated cartridge filter 56. Since it is reliably captured and removed by the pre-coated layer of the powdered ion exchange resin, there is no possibility that the powder ion exchange resin directly adheres to the filtration membrane 561 and clogs the filtration membrane 561. Moreover, since the filtration membrane 561 is pleated and has a large filtration capacity and a gradual rise in differential pressure, metal clad and the like can be efficiently removed, and the cleanup operation period can be shortened. At the end of the clean-up operation, the metal clad contained in the condensed water drops sharply and has a very low concentration (about 20 ppb) which is not different from that in the normal operation of the plant.
, The filtration membrane 561 in the steady operation after that.
The load on is greatly reduced.

After the clean-up operation, the power plant is switched to the normal operation. During this time or when the pressure rises from the differential pressure of the pleated cartridge filter 56 after the start of the normal operation, the condensate filtration tower 5 is turned on using, for example, backwash water. Backwash and remove each pleated cartridge filter 5 in the main body 51.
The powder ion exchange resin which is the precoat layer of No. 6 is removed. This backwashing operation is performed sequentially for each of the several condensate filtration towers 5 and finally for all of the condensate filtration towers 5. During the backwashing operation, the condensate is continuously treated except at the tower where the backwashing is being performed. When performing the backwashing operation, FIG.
After closing the valves of the inflow side and outflow side condensate piping 9B and opening the valves 14C, 15A and 17A, the pump 16 is driven to supply, for example, backwash water, as shown in FIG. The backwash water flows into the lower chamber 53 of the tower body 51 via the backwash pipe 15, and further permeates from the inner side to the outer side through the pleated cartridge filters 56 via the communication pipe 55 from the lower chamber 53. At this time, the powder ion-exchange resin is peeled off from the filtration membrane 561 of each pleated cartridge filter 56 by the backwashing water and dispersed throughout the upper chamber 52.

The powdered ion exchange resin flows out of the inflow pipe 51A together with the accompanying water, and is discharged out of the system through the drain pipe 17. When all the powder ion exchange resin is removed from each pleated cartridge filter 56 by the above-described backwashing operation, the pump 16 is stopped and the valve 15 is turned off.
A, 14C and 17A are closed, and once the holding pump 19 is driven to circulate the water in the tower body 51 through the circulation pipe 18, the condensate pipe 9B is opened again, and the upper chamber 52 of the tower body 51 is opened. The condensate is supplied to the inside, and the power plant enters a steady operation. In the steady operation, the condensate is filtered by each pleated cartridge filter 56, the condensate from which the metal clad has been removed flows into the lower chamber 53 from the communication pipe 55, and flows from the outflow pipe 51B via the condensate. It is supplied to the condensate desalination tower.

When the power plant enters the steady operation, the concentration of the metal clad in the condensed water is low in the steady operation stage as described above, and the pleated cartridge filter 56
Since the filtration capacity is larger than that of the conventional pre-coated filter element, after the backwashing operation is finally completed for all the condensate filtration towers 5, a steady-state operation is performed after a cleanup operation period after the next periodic inspection. It is not necessary to use powdered ion-exchange resin until the period until operation is reached, so it is compared with the conventional precoat type filter element that requires multiple precoating and backwashing operations before the next periodic inspection As a result, the amount of waste of the used powdered ion exchange resin can be significantly reduced, and the amount of water used in the backwashing and regenerating operation can be significantly reduced. If the differential pressure of the precoated pleated cartridge filter 56 rises from a predetermined differential pressure during a period from the cleanup operation period after the periodic inspection to the steady operation, a backwash operation is performed at that time. Needless to say, this is also good.

According to the present embodiment as described above,
During the period from the cleanup operation period after the periodic inspection to the steady operation, the pleated cartridge filter 56 used for the condensate filtration tower is pre-coated with the powdered ion exchange resin. Most of the metal clad due to material corrosion generated when the plant is stopped during the period from the operation period to the steady operation can be removed by the powder ion exchange resin.

Therefore, even if the pleated cartridge filter 56 is backwashed to remove the powdered ion exchange resin and the steady operation is started, the amount of metal clad contained in the condensate is small. Until the periodic inspection, each pleated cartridge filter 56 can be operated stably without such a large increase in differential pressure. Further, in this embodiment, the powder ion exchange resin is precoated only for a period from the cleanup operation period after the periodic inspection to the steady operation, and in the subsequent steady operation, the powder ion exchange resin is removed. The amount of exchange resin (which becomes radioactive waste in the case of BWR) can be significantly reduced, and the amount of water used in the backwash regeneration operation can be significantly reduced. For example, in the case of a conventional condensate filtration tower using a pre-coated filter element, it is necessary to perform a backwash regeneration operation 4 to 10 times in one year until a periodic inspection. The number of times of backwash regeneration in one year until the inspection is required only once during the period from the cleanup operation period after the periodic inspection to the steady operation,
The amount of used powder ion exchange resin (which becomes radioactive waste in the case of BWR) can be reduced to 1/4 to 1/10 of the conventional amount.

Further, since the pleated cartridge 56 is used as a filter element of the condensate filtration tower 5, the filtration capacity is large and metal clad and the like can be efficiently removed, so that the period of the cleanup operation can be shortened. Moreover, since the pleated cartridge filter 56 can be replaced with a conventional pre-coated filter element, the filter element can be replaced at very low cost without modifying the existing condensate filtration tower 5.

[0027]

【Example】

Embodiment 1 FIG. In the present embodiment, the pleated filter element is precoated with the following amount, and under the following experimental conditions, iron oxide fine particles corresponding to condensate during a period from a cleanup operation period after a periodic inspection to a steady operation and TOC
The operation of passing the water containing the components and the backwashing operation were repeated, and the relationship between the number of operating days and the change in the differential pressure at that time was observed. For reference, a pleated filter element without pre-coating was used, an experiment was performed under the same conditions as in the case of pre-coating, and the relationship between the number of operating days and the differential pressure fluctuation at that time was observed. Indicated by In FIG. 4, the arrow ↓ indicates the time when each filter element is backwashed with air and water. [Experimental conditions] Pleated filter element specifications: Outer diameter 65m
m, length 250mm, filtration area 0.8m ² , aperture 1μ
m 2. 2. Flow velocity of water: 0.34 m / h Inlet water quality: iron oxide fine particle concentration 1000 ppb, TO
3. C concentration 300 ppb 4. Precoat agent: powder cation exchange resin: powder anion exchange resin = 3: 1 Precoat amount: 40 g / element

As is apparent from the results shown in FIG. 4, the rise in the differential pressure is small in the case of the precoated pleated filter element, and the differential pressure rise of the pleated filter element does not increase even if the water flow and the backwashing operation are repeated. It is clear that the pleated filter element has little clogging and has excellent backwashing properties. On the other hand, if the precoating is not performed, the differential pressure rises faster each time the backwashing operation is repeated, so that the water passage time is shortened, and moreover, the clogging of the pleated filter element 56 is increased, and the backwashing property is rapidly reduced. It can be seen that clogging was not eliminated even in the backwashing operation, and the life was shortened. Therefore, it is understood that when the pleated filter element is pre-coated, the iron oxide fine particles and the TOC component can be effectively removed, and the backwash can be efficiently performed.

It should be noted that the present invention is not limited to the above-described embodiment at all. If the method is to precoat the filter element with the filter aid only at the start of the plant and during the cleanup operation, the operation of the present invention is not limited. Included in the method.

[0030]

According to the present invention, as described above,
According to the third aspect of the invention, it is possible to prevent a sudden increase in the differential pressure of the non-precoated filter element,
As a result, it is possible to provide a method of operating a condensate filtration device that can extend the life of the filter element and can significantly reduce the amount of used precoat agent.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a condensate filtration tower and ancillary equipment used in an embodiment of a method for operating a condensate filtration tower according to the present invention.

FIG. 2 is a view showing a filter element shown in FIG. 1;
(A) is a sectional view of an essential part showing a structure for mounting a filter element to a filtration tower main body, and (b) is a perspective view showing a seal adapter used when mounting the filter element to the filtration tower main body.

FIG. 3 is an exploded perspective view showing a part of the filter element shown in FIG. 2 in a developed manner.

FIG. 4 is a graph showing the relationship between the number of operating days of the filter element and the differential pressure of water flow in the filter element in the method for operating the condensate filtration device of the present invention.

FIG. 5 is a configuration diagram showing an outline of a power plant.

[Explanation of symbols]

5 Condensate filtration tower 6 Condensate desalination tower 51 Tower main body 52 Upper chamber 53 Lower chamber 56 Pleated cartridge filter (filter element)

Claims (3)

[Claims] 1. A method for operating a condensate filtration tower disposed at a stage subsequent to a condenser, wherein a period from a cleanup operation period after a periodic inspection to a steady operation is used for the condensate filtration tower. A method for operating a condensate filtration tower, characterized in that a filter aid is pre-coated on the obtained filter element. 2. The method according to claim 1, wherein a pleated filter is used as the filter element. 3. A pleated filter compatible with a pre-coated filter element is used as the filter element.
Operation method of the condensate filtration tower described in 4.