JPS58167997A - Method of operating magnetic filter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of operating a magnetic filter that adsorbs and removes soluble cobalt, which is a corrosion product contained in reactor cooling water of a nuclear power plant.

[Technical background of the invention]

For example, the reactor water of a nuclear power plant reactor is contaminated with and accumulates corrosion products generated from m-concentrated constituent materials, and due to these corrosion products, the heat exchange of the reactor water is interrupted.

Efficiency decreases and economic efficiency deteriorates. Therefore, a magnetic filter is installed in the reactor water system to remove corrosion products.

The above magnetic filter has t! As shown in Figure k1, a casing l made of ferromagnetic material, a filter element made of a stainless steel ferromagnetic fine wire filled in the casing l, and a filter element arranged to surround this filter element are arranged. An inflow pipe 5 is connected to one side of a non-magnetic container filled with a filter element, and an outflow pipe is connected to the other side.

[Problems with background technology]

However, magnetic filters of the above type cannot remove soluble substances containing heavy metal ions such as cobalt ions, so they cannot remove soluble substances such as ceramic raw materials such as kaolin and talc, slurry as a raw material for paper coating materials, cooling water for cold and hot rolling equipment, and scouring wastewater. It is used to remove fine iron powder mixed in the urine of the O factory, or corrosion products whose main component is magnetic material in the high-temperature water at each moderate power generation plant.

Therefore, the above magnetic filter is made of magnetite ('!/K04).
), zirconium oxide (Zr0t), titanium oxide (tiot), and other metal oxide particles are attached as P materials to adsorb and remove cobalt ions in high-temperature water under high-temperature conditions. 1,000 stages have been developed, but in this case, because the adsorption reaction of cobalt ions takes place on the surface of the coating, it is necessary to use a small number of metal oxide particles, that is, fine particles.
The pressure loss between the inflow pipe and the outflow side of the filtration device becomes large, making it impossible to obtain a large treatment flow rate.This necessitates the use of a thicker diaphragm device, which increases the power consumption of the water supply pump to be treated and increases the construction cost of the device. Another problem is that the operating costs are high.

On the other hand, the results of extensive experiments on the purification of corrosion products in high-temperature, ta-pressure water water used in nuclear power plants using magnetic filters were as follows. , nickel ferrite, zinc), light, copper ferrite, or ferrite particles mixed with metal oxide particles such as tin oxide, manganese oxide, titanium oxide, zirconia, alumina, and densified zinc. It has been found that when water containing Copal is supplied to a magnetic filter at a high flow rate of, for example, 200 mm, fine particles of Copal are regularly dispersed on the filter element, and in particular activated soluble copal is adsorbed and retained. Ta.

[Purpose of the invention]

The present invention has been made in view of the above points.

A method of operating a magnetic filter in which a cobalt adsorbent is adsorbed to the filter element of the magnetic filter using magnetic force, and high-temperature, high-pressure water containing soluble cobalt is passed through it to adsorb and remove the soluble cobalt. The purpose is to provide.

[Summary of the invention]

An object of the present invention is to disperse and hold an adsorbent having a property of adsorbing soluble cobalt using magnetic force on a filter element of a magnetic filter, and to apply a high-temperature filter containing soluble cobalt to a bale magnetic filter. This is achieved by a method of operating a magnetic filter that adsorbs and removes soluble cobalt through high-pressure reactor water and makes it possible to downsize the entire device.

[Embodiments of the invention]

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

No. Jl! 1, reference numeral 10 denotes a magnetic filter that is the same as that of the conventional structure, and this magnetic filter 10 is.

For example, the primary cooling water system of a boiling water nuclear power plant/
It is located at I. Supply of the above-mentioned secondary cooling water system/l
11ν valve saw and magnetic filter IO inflow pipe 50
One end of the adsorption slurry pipe w1/3 is connected to the cabinet, and the other end of the pipe line 13 is connected to the adsorption slurry tank through a valve l, a flow meter lS, and an adsorption slurry supply pump 16. It is connected to the. One end of an adsorbed slurry pipe 19 is connected between the outlet pipe 40 of the magnetic filter 10 and the magnetic filter 10 on the discharge side q of the ninth-order cooling water system. is connected to the slurry tank/7 via a valve, and constitutes a qsts path as a whole.

On the other hand, upper primary cooling water system/l discharge ml Q valve/l
One end of the backwash pipe 21 is connected to the upper R@, and the other end of this pipe is connected to the wash water tank J and compressed air arranged in parallel via valves U and U. Supply equipment #I-kuniso ・
are connected to each other. In addition, the nine pipes branched between the compressed air supply device and the valve are connected to the wash water tank via the valve, which pressurizes the water in the wash water tank and adjusts the water flow rate. I'm trying to get it.

On the other hand, one end of the adsorbent recovery pipe U is connected to the upstream side of the supply-1 valve /J of the primary cooling water system L/, and the other end of this pipe is connected to the adsorption material via the valve knob. Material recovery tank 30
It is connected to the.

The above-mentioned adsorbent includes ferrite fine particles such as magnetite, manganese ferrite, nickel 7Site, zinc ferrite, and copper ferrite with a particle size of 7 μm or less;
Or 7s light type fine particles and tin oxide, manganese oxide,
A quasi-combination of metal oxide fine particles such as titanium oxide, zirconia, aluminum oxide, and zinc oxide was mixed with water containing a low concentration of / ppm or less, and filtered at a flow rate of 30 oz. K is set so that it is supplied to

Furthermore, the code in the first figure is ? /d A stirrer to make the adsorbent slurry o** uniform.

Next, the effect will be explained.

When the excitation coil 3 is energized, a magnetic flux parallel to the fi11 direction is generated, the filter element is magnetized, and a so-called magnetic filter is formed.

Next, when the adsorption slurry supply pump/4f is started, the adsorbent in the adsorption slurry tanker 17 passes through the flow rate side/JS and the valve array, and flows through the inflow pipe (J) into the magnetized filter element (J).
The adsorbent that has passed through the pipe passes through the valve and returns to the adsorption slurry tank through the pipe. I can pass through this filter! 4c/The adsorbent is dispersed and adsorbed on the filter. When the amount of dispersed adsorption of this adsorbent reaches a predetermined amount, the adsorption slurry supply pump 16 is stopped. At the same time, the bento and the valves are closed. This will close the adsorbent circuit.

Next, when the valve TOP and valve /l are opened, the liquid to be treated passes through the primary cooling water system ti, is guided to the magnetic filter IQ, passes through the filter element which has dispersed and adsorbed the adsorbent, and passes through the valve /l.
It is treated as treated water through 1.

While passing through this filter element, the insoluble cobalt component contained in the processing liquid is magnetically adsorbed onto the filter element in its state. In addition, soluble cobalt is chemically adsorbed on the surface of the particulate adsorbent that is adsorbed and held on the filter. This adsorption of soluble cobalt is carried out for a predetermined treatment time.

When the adsorption of soluble cobalt reaches the limit amount, the excitation current of the magnetic filter IO is cut off, the filter element i is demagnetized, and the valves I and I are closed.

Next, by turning valves u, u, and 27, a mixed flow of compressed air and water is sent to the magnetic filter IO, and the adsorbent and cobalt components adsorbed on the filter element are separated from the filter element. . At the same time, the valve D is opened, and the adsorbent and;
Vacuum component t-adsorbent collection is discharged at 30 pm. As a result, the magnetoresistive filter 10 will be regenerated.

When the core and -t are closed, the backwashing operation is completed.

The same action will be repeated thereafter.

FIG. 3 is a diagram showing the concentration of soluble cobalt obtained by the method of the present invention, and shows the concentration of soluble cobalt in high-temperature water using only magnetite fine particles as an adsorbent.
In contrast, when ferrite particles or mixed particles of magnetite and metal oxide are used as the adsorbent, the soluble cobalt concentration decreases rapidly with increasing operating time (processing time). This shows that the value decreases to .

〔Effect of the invention〕

As described above, according to the present invention, any filling rate (ratio of the total volume of the adsorbent particles to the volume of the filter container) can be selected regardless of the size of the adsorbent particles.

Therefore, the pressure loss on the filter inflow side and all outflow sides can be reduced, and the processing flow rate per unit area of the filter can be set to the same flow rate as that of a conventional magnetic filter. This has the effect of being able to remove both soluble cobalt at the same time.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional magnetic filter, FIG. 2 is a flowchart showing a method of operating a magnetic filter according to the present invention, and FIG. 3 is a diagram showing changes in soluble copal concentration due to adsorbent. /...Casing, Co...: Filter element, 3
...Exciting coil...container, IO...magnetic filter, //...-secondary cooling water system, /J...pipeline, 16
...Adsorption slurry supply pump, /7...Adsorption slurry 2
Lee tank, review...Washing water tank,,,30...Adsorption tank recovery tank. . Applicant's agent Kiyoshi Inomata Figure 1, Figure 2, Figure 3 - 12 hours

Claims (1)

[Claims] / A magnetic filter is provided in the high-temperature, high-pressure reactor water system of a nuclear power plant, and soluble cobalt can be adsorbed onto the filter element of the magnetic filter using magnetic force.
A method for operating a magnetic filter, comprising: dispersing and holding an adsorbent having such characteristics, and then passing high-temperature, high-pressure reactor water containing soluble cobalt through the magnetic filter to adsorb and remove soluble cobalt. A patent characterized in that the 2-part adsorbent is made of at least l kinds of fluorite-based fine particles such as magnetite, manganese 8-phyte, nickel sulfite, zinc ferrite, copper oxide, and 2-ite. A method of operating a magnetic filter according to claim 1.・ 3゜ Cobalt adsorbent contains at least/seed of ferrite-based fine particles, which are non-magnetic substances such as tin oxide, doped manganese,
Claim 1, characterized in that it is composed of a mixture of at least seven types of metal oxide fine particles such as titanium 11, zirconia, aluminum, and zinc chloride.
Magnetic filter po operation method described in section.