JPS6279820A - High-temperature filter - Google Patents

Abstract

PURPOSE:To efficiently remove a corrosion product by magnetizing a packed bed of a ferromagnetic granular element with the fine particles of an adsorbent magnetically attached to its surface with a permanent magnet which can be freely inserted and drawn out and passing raw water through the packed bed. CONSTITUTION:The upper end of each permanent magnet 15 is set nearly at the position of a screen 8, the ferromagnetic granular element 11 at the lower part of the packed bed 12 is magnetized, then a water suspension wherein the fine particles of the adsorbent such as Fe3O4 are dispersed is passed through the packed bed 12 and the fine particles of the adsorbent are magnetically attached to the surface of the element 11. Subsequently, the position of the permanent magnet is successively changed and the fine particles of the adsorbent is magnetically attached to the whole surface of the packed bed 12. The high- temp. raw water is supplied into a vessel 1 from an inlet 2, the ionic corrosion products of Co<2+>-60, Co<2+>-58, etc., are adsorbed, the granular corrosion products are attracted and collected and the wash water is discharged from an outlet 3. The permanent magnet is again moved to demagnetize the element 11 and backwashing is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a high-temperature filter for removing corrosion products contained in high-temperature raw water, and particularly to a high-temperature filter suitable for use in an atomic couplant.

[Technical background of the invention and its problems]

Carbon steel and stainless steel are often used in nuclear couplants, and the corrosion products generated by the corrosion of these completely bent materials can have a negative impact on plant operation. For example, when these corrosion products are activated by neutrons in a nuclear reactor core and become radioactive substances, they escape outside the core and cause problems such as radiation exposure. In particular, when cobalt contained in stainless steel, stellite materials, etc. is activated, it becomes cobalt-60, which is currently the most harmful radioactive substance in atomic couplants. Therefore, it is an important issue to sufficiently remove cobalt and cobalt-60.

Conventionally, ion exchange resins have been used to remove these substances, but since ion exchange resins cannot be used with high-temperature water of around 70°C or higher, raw water must be cooled to room temperature by cooling it with a heat exchanger. , the ion exchange resin tower is used. For this reason, increasing the processing capacity due to the need to sufficiently remove cobalt and cobalt-60, etc. not only increases the size of the equipment, but also increases heat loss, resulting in a decrease in power generation output, and the removal of radioactive waste. There are problems such as an increase in the amount generated.

[Purpose of the invention]

The present invention has been made in consideration of these points, and an object of the present invention is to provide a high-temperature filter that can efficiently remove corrosion products from raw water without lowering the temperature of the raw water.

[Summary of the invention]

The present invention provides ferromagnetic granular Nilemene 1 to 1 formed in a container.
The packed bed is magnetized by a plurality of permanent magnets that can be inserted into and removed from the packed bed, and a particulate adsorbent is magnetically attached to the surface of each magnetized ferromagnetic granular element, and hot raw water is applied to the packed bed. The ionic 1@corrosion products in the raw water are adsorbed by the fine particulate adsorbent, and the particulate corrosion products in the raw water are captured by the ferromagnetic particulate elements, thereby removing high-temperature raw water from the raw water. It is characterized by being able to efficiently remove corrosion products.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a container on the right side of an inlet 2 and an outlet 3, and the inlet 2 distributes the flow of raw water flowing in from the inlet 2, and also prevents the flow of ferromagnetic particulate elements 11, which will be described later, during backwashing. Upper screen to prevent 4
A vortex prevention/baffle plate 5 is installed at the outlet 3 to prevent eddies from being generated during raw water treatment operation and to distribute backwash water.

Furthermore, as shown in FIGS. 1 and 2, a lattice plate 6 is installed inside the container 1 to separate the inlet 2 side and the outlet 3 side. A cylindrical housing 7 is inserted and fixed to protrude downward from the lattice plate 6, and a circular screen 8 is installed on the upper surface of each lattice portion of the lattice plate 6.

At the outer periphery of the area where the screen 8 is installed, a packed bed partition 9 is provided which rises in a cylindrical shape from the lattice plate 6, as shown in FIGS. 1 and 2.

Inside the housing 7, as shown in FIG. 1, an upper end closing part f510 is loosely penetrated, the lower end of which penetrates the bottom surface of the container 1 in a watertight manner and the upper end of which protrudes upward from the lattice plate 6. The inside of the lower half of the partition 9 is filled with ferromagnetic granular elements 11 to a thickness such that the inner tube 10 is buried therein to form a packed layer 12 .

The ferromagnetic granular element 11 is usually formed of a spherical body made of ferromagnetic stainless steel and has a diameter of approximately 1 cylinder, but is not limited to this, and may be made of other ferromagnetic materials as long as it has corrosion resistance. The shape, size, etc. can also be changed as appropriate.

As shown in FIGS. 1 and 2, a lattice-shaped rectifying/unbalancing plate 13 is installed above the packed layer 12 of the ferromagnetic granular elements 11.
3 has a rectification function of the raw water flowing in from the inlet 2, and the ferromagnetic granular elements 11 that are fluidized during backwashing of the packed bed 12 settle evenly after the backwashing is stopped, and the packed bed 12 becomes uniform again.
It has an anti-bias function and is designed to form the right shape.

Further, as shown in FIGS. 1 and 2, a cap-shaped inner tube/outer tube 14 is attached to a portion of each inner tube 10 that protrudes in one direction from the lattice plate 6. This prevents the ferromagnetic particulate element 11 from falling from between the plate 6 and the plate 6.

On the other hand, the temperature inside each inner cylinder 10 is approximately 300°C as shown in FIG.
Permanent magnets 15 that can withstand the reactor water temperature of '& is connected via Rad 1F. The lifting platform 16 is mounted on a worm gear jack 1 as shown in FIG.
8 to move up and down along a guide 19.

The inner cylinder 10 is made of, for example, non-magnetic stainless steel in order to avoid contact demagnetization caused by contact of the permanent magnet 15 with a ferromagnetic material, since the inner cylinder 10 moves while being in contact with the permanent magnet 15 inside thereof. In addition, in order to ensure that the magnetic flux generated by the permanent magnet 15 effectively acts on the magnetization of the ferromagnetic granular element 11, the inner fE 10 as well as the screen 8, the packed bed partition 9, the rectifying/unbiasing plate 13, the inner cylinder and outer tube 14, J3 and the rod 17 are also made of, for example, non-magnetic stainless steel, and the grid plate 6 and the housing 7 are made of, for example, ferromagnetic stainless steel. The advantage of the housing 7 is that, as shown in FIG. There are concerns that this will not be leaked.

The packed bed 12 magnetized by the permanent magnet 15 is filled with a particulate adsorbent (not shown) before the raw water is treated.
The suspended water in which the
vIi uniformly on the surface of each ferromagnetic granular element 11
It is designed to be worn.

As this particulate adsorbent, FC3304゜MnFC
204rr ferromagnetic ferrite fine particles or α-F
Paramagnetic or non-magnetic metal oxide fine particles such as 0203,
They can be used alone or in combination.

Next, the operation of this embodiment will be explained.

When treating raw water, first of all, warm it! Yajiyatsuki 18
As a result, the upper end of the magnetic pole of each permanent magnet 15 is set approximately at the position of the screen 8, and the ferromagnetic granular elements 11 in the lower layer of the filled layer 12 are magnetized.

Next, the suspended water in which the particulate adsorbent is dispersed is passed through the packed bed 12 from the inlet 2 and circulated to the outlet 3. Then, the particulate adsorbent is magnetically attached to the surface of the ferromagnetic particulate element 11 in the lower layer of the packed bed 12.

Next, each permanent magnet 1 is connected by the worm gear jack 18.
The position 5 is slightly raised H, and suspended water in which particulate adsorbent is dispersed is passed through the packed bed 12 in the same manner as described above. Then, the particulate adsorbent is magnetically attracted to the surface of the ferromagnetic particulate element 11 in a portion slightly above the lower end of the packed bed 12. This operation is repeated while raising each permanent magnet 15 little by little, so that the particulate adsorbent is magnetically attached to the entire layer of the packed bed 12.

As a result, the particulate adsorbent is not deposited only on the surface layer of the full layer 12, but is distributed uniformly over the entire layer.
I can arrive at l41.

Next, raw water is supplied into the container 1 from the inlet 2, and the packed bed 1
2 and discharged from outlet 3. Then, 2+ "; Go -60, Co" contained in the water -58
Ion-like corrosion products such as those are adsorbed by the particulate adsorbent, and particulate corrosion products such as metal oxides are attracted and captured by the ferromagnetic particulate element 11 by magnetic force.

When taking out these corrosion products collected in the packed bed 12, washing water is supplied into the container 1 from the outlet 3, and
2 and discharged from the inlet 1, each permanent magnet 15 is pulled down from the packed bed 12 and moved into the housing 7 by the worm gear jack 18, and the ferromagnetic granular elements 11 are demagnetized. Then, the corrosion products and particulate adsorbent trapped in the ferromagnetic granular element 11 are released by demagnetization of the ferromagnetic granular element 11, and are discharged from the inlet 2 along with the cleaning water.

On the other hand, the packed bed 12 is fluidized by the upward washing water,
Due to the stirring action, the surface of the ferromagnetic granular element 11 is sufficiently cleaned. Then, due to the rectification and unbalance prevention plate 13, after the backwashing is stopped, the filling layer 1 is evenly distributed again without falling.
2 will be formed. .

In this way, the particulate adsorbent is uniformly magnetized on the surface of the ferromagnetic granular Niremen 1-11 magnetized by the permanent magnet 15, and the Toshihara water is passed through the packed bed 12 to collect corrosion products. Since the raw water is removed, the raw water can be treated at a high temperature, reducing heat loss and eliminating the need for a heat exchanger or the like. In addition, since fine particulate adsorbent is used, the absorption of M
The dispersion surface area of '+4 means that there are many opportunities for people to come into contact with corrosion products, so corrosion products can be removed efficiently. In addition, since the fine particulate adsorbent can be suspended by simply being magnetically attached to the surface of the ferromagnetic particulate element 11, radioactive waste is generated less frequently. In addition, even if a power loss accident occurs, the particulate adsorbent and corrosion products are retained by the magnetic force of the ferromagnetic granular element 11 magnetized by the permanent magnet 15, so they will not flow out and be safe. High performance and reliability.

In addition, since it uses a particulate adsorbent that is easy to fluidize,
The entire system operation including regeneration of the packed bed 12 can be easily automated and unmanned.

〔Effect of the invention〕

As explained above, the present invention magnetizes a packed layer of ferromagnetic granular elements formed in a container using a plurality of permanent magnets that can be inserted into and removed from the packed layer, and also magnetizes each magnetized magnetic granular element. Apply particulate adsorbent to the surface.
The high-temperature raw water is passed through this packed bed, and the ionic rotten substances in the raw water are adsorbed by the fine particulate adsorbent, and the particulate lIg caries acid products in the raw water are absorbed into the ferromagnetic granular Nilemene. 1 to 3, it is possible to efficiently remove corrosion products from raw water without reducing the raw water shortage.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view of Mi of a high-temperature filter showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the structure of the dot portion of the packed bed in FIG. 1. . 1... Container, 2... Inlet, 3... Outlet, 6...
Lattice plate, 7... Housing, 8... Screen, 9
...Full layer partition, 10...Inner cylinder, 11...Ferromagnetic granular Niremen 1~. 12... Filled bed, 13... Rectifier and anti-bias plate, 1/I... Inner cylinder/outer tube, 15... Permanent magnet, 18... 4-Mugisejit? Moon. Applicant's agent Mr. Sato 61 Figure

Claims (1)

[Claims] 1. A packed layer of ferromagnetic granular elements formed in the container to separate the inlet and outlet of the container, and a plurality of ferromagnetic granular elements that are removably inserted into the packed layer to magnetize the packed layer. a permanent magnet, and a particulate adsorbent magnetically attracted to the surface of each ferromagnetic particulate element magnetized by the permanent magnet, the high-temperature raw water supplied into the container from the inlet is passed through the packed bed,
A high-temperature filter characterized in that ionic corrosion products in raw water are adsorbed by the particulate adsorbent, and particulate corrosion products in the raw water are captured by the ferromagnetic particulate emerent. 2. As particulate adsorbent, ferromagnetic ferrite fine particles,
The high-temperature filter according to claim 1, characterized in that paramagnetic metal oxide fine particles or non-magnetic metal oxide fine particles are used alone or in combination.