JPH0137743Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is applied to water towers of condensate desalination equipment installed to remove ions and suspended solids from condensate in thermal power plants and nuclear power plants. Regarding.

<Conventional technology> In thermal power plants and nuclear power plants, steam after driving a power generation turbine is cooled to condensate, and impurities such as ions and suspended solids in the condensate are desalinated. Electricity is generated through a cycle in which the treated condensate is removed by a device and then heated again to convert it into steam.

The condensate desalination equipment used to treat such condensate consists of a plurality of water towers that process condensate by filling them with a mixed ion exchange resin of a cation exchange resin and an anion exchange resin, and a water tower that processes the condensate. It usually consists of a regeneration system for extracting, separating and regenerating the used mixed ion exchange resin.

Therefore, the water tower used in the condensate desalination equipment includes a resin slurry discharge pipe for transporting the used mixed ion exchange resin to the regeneration system, and a resin slurry discharge pipe for transporting the used mixed ion exchange resin from the regeneration system. A resin slurry supply pipe is attached to receive the resin slurry.
Furthermore, condensate inflow pipes and outflow pipes are provided for flowing condensate into the mixed ion exchange resin packed bed filled in the water tower and for discharging treated water.

Figure 2 is an explanatory diagram of the conventional water tower.
To explain its structure, a support plate 2 is provided in the lower part of the ion exchange tower 1 to allow the ion exchange resin to pass through but not to allow the condensate to pass through, and a water collection chamber 3 is formed in the lower part of the support plate 2. The support plate 2 is made by drilling a large number of holes in the support plate 2 and covering the top of each hole with a wedge wire screen 4, which holds the ion exchange resin and allows water to pass through. .

In addition, an ion exchange resin outlet 5 is opened approximately in the center of the support plate 2, one end of a resin slurry discharge pipe 6 is connected to the outlet 5, and the discharge pipe 6 is connected to the outlet 5 through the water collection chamber 3. Mirror plate 7 at the bottom of the ion exchange tower
The other end of the discharge pipe 6 faces the outside of the ion exchange column 1.

Further, the penetration portion 8 is completely sealed by welding or the like so that the water in the water collection chamber 3 does not leak out of the tower.

Note that 9 is a condensate inflow pipe, 10 is a condensate outflow pipe, and 11 is a condensate outflow pipe.
1 is a resin slurry supply pipe, 12 is a rectifying plate, and 13 is a baffle plate.

When treating condensate in such a conventional water tower, the regenerated mixed ion exchange resin 14 transferred via piping from the regeneration system is filled into the ion exchange tower 1 using the resin slurry supply pipe 11. Next, the condensate to be treated flows in from the condensate inlet pipe 9, the flow of condensate in the column is rectified by the baffle plate 13 and the rectifier plate 12, and is passed through a packed bed of mixed ion exchange resin 14. Ions and suspended solids in the condensate are removed, and the treated condensate is passed through a wedge wire screen 4 and a water collection chamber 3 to a condensate outflow pipe 10.
More leaks out of the tower. In addition, when the processing capacity of the mixed ion exchange resin 14 decreases due to such water flow, or when the specified amount of water flow is reached, the used mixed ion exchange resin 14 is transferred to the regeneration system using the resin slurry discharge pipe 6. Then, the regenerated mixed ion exchange resin 14 stored in the regeneration system is received again, and the water flow as described above is continued.

<Problems to be solved by the invention> However, conventional water towers have the following drawbacks.

That is, in the conventional water tower, the resin slurry discharge pipe 6 penetrates the head plate 7 at the bottom of the ion exchange tower, and the penetration part 8 is completely sealed by welding or the like, and the discharge pipe 6 is Since it is one continuous pipe, the pressure applied to the support plate 2 is applied directly to the penetration part 8, and the pressure applied to the support plate 2 is applied directly to the penetration part 8.
The stress analysis is complicated, and the structure is likely to generate residual stress.As a result, the manufacturing process is quite troublesome and the manufacturing cost is high.

In particular, water towers used in condensate desalination equipment in nuclear power plants with BWR reactors are
The design differential pressure is 10 Kg/cm ² , which requires a design differential pressure that is 2 to 5 times that of a normal water tower, which further exacerbates the above-mentioned drawbacks.

<Means for Solving the Problems> The purpose of the present invention is to solve the drawbacks of conventional water towers, and to prevent the pressure applied to the support plate 2 from being transmitted to the penetration part 8, so that the water collection chamber This is characterized in that the resin slurry discharge pipe in 3 has a telescopic structure.

The present invention will be explained in detail below based on the drawings.

FIG. 1 is a cutaway sectional view of a main part of an example of an embodiment of the present invention, in which a resin slurry discharge pipe 6a is inserted through a mounting seat 15 provided at approximately the center of the support plate 2, and one end of the discharge pipe 6a is inserted. provided flange 16
is aligned with the mounting seat 15 and fixed with bolts 17. On the other hand, a mounting seat 18 is also provided on the head plate 7 at the lower part of the ion exchange tower, into which the resin slurry discharge pipe 6b is inserted and the discharge pipe 6b is fixed using a flange 19 and bolts 20. The resin slurry discharge pipes 6a and 6b have different inner diameters, and the discharge pipe 6a is inserted into the discharge pipe 6b.
Both discharge pipes 6a and 6b are configured to fit together.
Since the mixed ion exchange resin 14 in the column is transferred through the discharge pipe 6 as described above, it is desirable that the gap between the communication points 21 is 0.3 mm or less so that the ion exchange resin does not leak from the gap.

Furthermore, a flange 22 is provided at the lower end of the resin slurry discharge pipe 6b, and the flange 22 and the flange 22 at one end of the resin slurry discharge pipe 6c are connected by a bolt nut 24, and the other end of the discharge pipe 6c is connected to the regeneration system (Fig. (not shown). Note that 25 indicates a gasket, and the other structures of the water tower of the present invention are the same as those of the conventional water tower, so the explanation will be omitted.

<Functions and Effects> As explained above, in the water tower of the present invention, the resin slurry discharge pipes 6a and 6b in the water collection chamber 3 are fitted together, and the communication point 21 is loosely fitted, thereby achieving a freely expandable structure. Therefore, the pressure applied to the support plate 2 is not applied to the penetrating portion 8, and therefore stress analysis of the penetrating portion 8 is extremely easy, manufacturing is simple, and the manufacturing cost is also low.

When treating condensate using the water tower of the present invention,
Even if water leaks into the water collection chamber 3 from the gap between the communication points 21, there is no problem because the water is the same treated condensate that has passed through the packed bed of the mixed ion exchange resin 14.
Moreover, when the used mixed ion exchange resin 14 is transferred using the resin slurry discharge pipe 6, there is no problem even if some of the transferred water leaks from the gap.

As shown in FIG. 1, the resin slurry discharge pipe 6b is made thicker and the resin slurry discharge pipe 6a is made thicker.
It is more preferable to make the discharge pipe 6a thin and insert the discharge pipe 6a into the discharge pipe 6b in order to prevent leakage of the ion exchange resin from the communication point 21.

In some cases, an O-ring (not shown) may be provided on the outer periphery near the tip of the discharge pipe 6a to ensure sealing of this portion.

In the embodiment described above, the resin slurry discharge pipe in the water collection chamber 3 is constructed by connecting two pipes, and the communicating part is loosely fitted by inserting the other pipe into one pipe. However, since the purpose of the present invention is to prevent the pressure applied to the support plate 2 from being applied to the penetrating portion 8, the present invention is not limited to this, and for example, although the manufacturing cost may be somewhat high, the present invention is not limited to this. , all or part of the resin slurry discharge pipe 6 in the water collection chamber 3 may be made into a flexible tube.

[Brief explanation of the drawing]

FIG. 1 is a cutaway sectional view of the main parts of the water tower of the present invention, and FIG. 2 is an explanatory diagram of a conventional water tower. 1... Ion exchange tower, 2... Support plate, 3... Water collection chamber, 4... Wedge wire screen, 5...
... Ion exchange resin outlet, 6 ... Resin slurry discharge pipe, 7 ... End plate, 8 ... Penetration part, 9 ... Condensate inflow pipe, 10 ... Condensate outflow pipe, 11 ... Resin slurry supply pipe, 12... Current plate, 13... Buffful plate, 14... Mixed ion exchange resin, 15,
18... Mounting seat, 16, 19, 22, 23... Flange, 17, 20... Bolt, 21... Communication point, 24... Bolt nut, 25... Gasket.

Claims (1)

[Claims for Utility Model Registration] (1) By providing an ion exchange resin support plate below the ion exchange tower that does not allow ion exchange resin to pass through but allows water to pass through, a water collection chamber is created at the bottom of the support plate. , one end of a resin slurry discharge pipe is connected to the ion exchange resin outlet opened in the support plate, and the discharge pipe is passed through the bottom plate of the ion exchange tower through the water collection chamber. A water tower for a condensate desalination apparatus, characterized in that the resin slurry discharge pipe in the water collection chamber has a structure that is freely expandable and retractable. (2) The resin slurry discharge pipe in the water collection chamber is constructed by connecting two pipes, and the communicating part is made freely expandable and retractable by inserting the other pipe into one pipe and making it loosely fit. A water tower for a condensate desalination apparatus as claimed in claim 1 of the registered utility model.