JPS5839831Y2 - Water tower for desalination equipment with rectifier grid - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rectifying grid for the water flow rate of a condensate desalination equipment using a downward flow type water flow method. The purpose of the present invention is to prevent uneven flow in the water tower by providing this, and to prevent disturbance on the surface of the ion exchange resin layer by preventing uneven flow.

BACKGROUND OF THE INVENTION Condensate desalination equipment using ion exchange resins is widely used as a method for removing ions and suspended solids from condensate at thermal power plants and nuclear power plants.

Condensate desalination equipment has two types of water flow: cylindrical and spherical, and in order to process a large amount of condensate, the column diameter is generally 2.4 mm.
A large device of ~3.4 m is used.

Furthermore, the linear velocity of condensate in the ion exchange resin layer is very high, for example, 90 to 120 m/H, and the amount of condensate per column is large, 500 to 1000 m/H.

In order to prevent deterioration of ion exchange performance and to carry out efficient treatment with the amount of water flowing through such a condensate desalination apparatus, it is necessary to give sufficient consideration to the rectification mechanism in the water tower.

For this reason, in the past, a baffle plate was installed at the inlet of the condensate in the water tower as a rectification mechanism to uniformly distribute the condensate to the surface of the ion exchange resin layer.The baffle plate first roughly distributed the condensate and then further The flow was rectified again by passing through a perforated plate installed in the middle of the free board above the ion exchange resin layer in the water tower.

However, due to the recent increase in the linear flow rate of condensate and the increase in water flow rate per tower, the water flow rate with such a rectification mechanism is not sufficient for ion exchange at the time of filling with ion exchange resin. The surface of the resin layer was rough for a long time (24 to 72 hours) after the condensate water flow started.
When observed over a period of time, it can be seen that some parts of the surface of the ion exchange resin layer are depressed, some parts are raised, and the surface of the ion exchange resin layer is uneven.

For this reason, the ion exchange performance is reduced, and the removal performance of suspended solids is also reduced.

Particularly when seawater leaks into condensate, if the resin bed height is partially reduced, the ion exchange resin packed in the system will not work effectively, resulting in the disadvantage that the specified throughput cannot be obtained. .

The reason why unevenness occurs on the surface of the ion exchange resin layer when condensate flows is that the ion exchange resin on the surface of the ion exchange resin layer moves little by little due to minute drifts that occur in the water tower.
It is thought that small irregularities are formed on the surface of the ion-exchange resin layer, which in turn causes a vicious cycle of expanding the drift, resulting in large irregularities after a long period of time.

The present invention compensates for the shortcomings of the conventional rectification mechanism in terms of the water flow rate of condensate desalination equipment using the downward flow method.
The cross-sectional shape of each grid is circular or polygonal with an area of 100 to 16,000 m2, and the height is 100 to 16,000 m2, within a range of 3QQmm above and below the surface of the ion exchange resin filled in the water tower. It is characterized by the provision of a rectifying grid with vertical walls of 500 mm.

The present invention will be explained below with reference to the drawings showing an example of the embodiment.

In Fig. 1, 1 is the water flow rate of the condensate desalination equipment using the downward flow water flow method. , the treated water outlet pipe 7 is connected to the lower part.

3 is a baffle plate, and the baffle plate.

The rate 3 is installed directly below the condensate inlet pipe 6.

Further, 4 is a flat multi-hole plate having a hole diameter of 5 to 20 mm (1), and is provided at a position intermediate between the baffle plate 3 and the surface 8 of the two layers of ion exchange resin.

Furthermore, 5 is a rectifying grid, and the height L is 100 to 600 m.
m, preferably 200 to 400 mm), and the cross-sectional area of each grid is 100 to 1600 cm2, and the shape of each grid is either circular as shown in Figure 2a, or
Alternatively, it may be rectangular as shown in FIG. 2, or hexagonal as shown in FIG. 2C.

Note that the shapes are not limited to those shown in FIG. 2B and FIG. 2C, but other polygonal shapes may be used.

Further, the rectifying grid 5 is fixedly installed in the water tower within a range of 3QQmm above and below, preferably 200 mm, based on the surface 8 of the two layers of ion exchange resin.

The thickness of the rectifying grid 5 may be such that it can withstand the pressure applied when water such as condensate passes through or when the ion exchange resin 2 is transferred, and for example, stainless steel with a thickness of 4 to 10 mm may be used.

When water flow starts at the water flow rate 1 as described above, condensate flows from the condensate flow pipe 6 into the water flow rate 1, and first the flow of condensate hits the baffle plate 3 and roughly divides this into the water flow rate 1. After the condensate is distributed to , the condensate is passed through the holes of the multi-hole plate 4 to be rectified.

Subsequently, the condensate is further rectified by a rectifying grid 5 provided near the surface 8 of the two layers of ion exchange resin, thereby eliminating the minute drift that has occurred in the conventional water flow rate 1.

Furthermore, even if a minute drift occurs, the movement of the ion exchange resin 2 is blocked by the side surfaces of the rectifying grid 5, so the surface 8 of the two layers of ion exchange resin does not become uneven.

The condensate thus evenly distributed within the water flow rate 1 passes through two layers of ion exchange resin and is obtained as treated water from the treated water outlet pipe 7.

The installation position of the rectifier grid 5 should be within a range of 3QQ mm above and below the surface 8 of the two layers of ion exchange resin, so that the rectifier grid 5 is completely above the surface 8 of the two layers of ion exchange resin. Although it may be exposed or completely buried below the surface 8 of the two layers of ion exchange resin, it is preferable that the two layers of ion exchange resin be completely buried below the surface 8 of the two layers of ion exchange resin. If the rectifier grating 5 is attached to the surface 8 so that the height is one-half of the rectifier grating 5, the rectifying effect of the rectifier grating 5 becomes even more remarkable.

Furthermore, if the area of the cross section of each grid of the rectifying grid 5 is too small, it will be difficult to transfer the ion exchange resin, and if it is too large, the rectifying effect will be lost. ~16,000m2 is appropriate.

In this way, according to the present invention, by providing the rectifying grid 5 within the water flow rate 1, it is possible to prevent minute drifts that could not be prevented by conventional flow straightening mechanisms alone, and to prevent the surface 8 of the two layers of ion exchange resin caused by the drift. This can prevent the resin from moving.

Examples of the present invention will be described below.

Example: Using the water flow rate of a condensate desalination equipment with a downward flow water flow system having a tower diameter of 2600 mm i4, the resin layer height in the water tower was 89Q.
The ion exchange resin was filled so that the thickness was 1 mm.

A diameter of 5 mm is installed near the condensate inlet in the water tower as a condensate rectification mechanism.
A dish-shaped baffle plate of 00mm is installed, and 54Q is placed below the baffle plate from the surface of the ion exchange resin layer.
A multi-hole plate with a hole diameter of 20 mm q and a pitch of 50 mm was provided above the plate.

Furthermore, ion exchange was carried out using a rectifying grid in which 6 mm thick SUS 304 stainless steel plates with vertical walls of 200 mm height were arranged side by side to form a grid, and each grid had a square cross section with a width of 250 mm. It was installed in a water tower so that the surface of the resin layer was approximately halfway between the heights of the vertical walls of the rectifier grid.

Condensate water flow was started at such a water flow rate of 610 m3/H (average linear flow rate 120 m/H), and the appearance of the surface of the ion exchange resin was observed over a period of 72 hours.

In addition, in order to compare with the experiment using a water tower according to the present invention, condensate was passed through a conventional device using the same water tower with only a plate baffle plate and a multi-hole plate at a flow rate of 610 m3/H (average linear flow rate of 120 m/H). ), water flow was started, and the appearance of the surface of the ion exchange resin layer was observed for 72 hours.

As a result of observation, no unevenness was observed on the surface of the ion-exchange resin layer in the water tower equipped with the rectifying grid of the present invention, but in the water tower equipped with only the conventional rectifying mechanism, 20 hours after the start of water flow. Large dents began to appear on the surface of the ion exchange resin layer, and this was observed to move little by little.After the water flow was completed, the unevenness of the surface of the ion exchange resin layer was measured, and the highest and lowest heights of the resin layer surface were observed. The difference in size is 398
There was also one large dent with a diameter of 95 Qmm and a depth of 280 to 319 mm, and three dents with a diameter of 350 to 520 mm and a depth of 100 to 200 mm.

As described above, in the water tower of the present invention, it was possible to completely prevent the phenomenon of unevenness on the surface of the ion exchange resin layer in conventional water towers.

[Brief explanation of drawings]

All drawings show embodiments of the present invention,
Fig. 1 is a schematic sectional view showing an example of an embodiment of the water tower of the condensate desalination equipment with a rectifying grid of the present invention, and Fig. 2 a, l), and c are schematic diagrams of various rectifying grids attached to the water tower. FIG. 1... Water tower of condensate desalination equipment, 2...
Ion exchange resin, 3...Baffle plate, 4
...Multi-hole plate, 5... Rectifier grid, 6...
... Condensate inflow pipe, 7 ... Treated water outlet pipe, 8
・・・・・・Surface of ion exchange resin layer.

Claims (1)

[Scope of utility model registration request] In the water flow rate of the condensate desalination equipment of the downflow water type, the cross-sectional shape of each grid has an area of 100 mm within a range of 39 Q mm above and below the surface of the ion exchange resin layer filled in the water tower. Water flow rate of a condensate desalination apparatus with a rectifying grid, characterized in that the rectifying grid is circular or polygonal and has vertical walls of 100 to 600 mm in height.