JPS6048214B2 - Electromagnetic filter cleaning method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electromagnetic filter for the purpose of removing crud in high-temperature, high-pressure water systems in thermal power plants, nuclear power plants, etc.
This invention relates to a cleaning process for a so-called high-gradient electromagnetic filter that generates a high-gradient magnetic field.

More specifically, the present invention mainly focuses on temperatures of 130°C or higher,
The present invention relates to an improved cleaning method and cleaning device for an electromagnetic filter that filters high-temperature, high-pressure water with a pressure of 3 to 9 fId or higher.

Generally, an electromagnetic filter is equipped with a matrix and an electromagnetic coil that magnetizes the matrix, and filters suspended particles (cladding) of ferromagnetic, magnetic, and weakly magnetic substances in a fluid by capturing them with the matrix using magnetic force and separating and removing them. However, if crud accumulates in the matrix due to continued filtration and the differential pressure increases, or if the filtered water quality deteriorates due to a decline in filtration function, filtration should be interrupted and the matrix should be washed. must be carried out.

For this cleaning, there is a cleaning method in which when high-temperature, high-pressure water is filtered, brushing is performed in the opposite direction using the body's own energy without using an external cleaning source. That is, on the filtrate outflow side of the matrix of the electromagnetic filter, there is provided a space at least equal to or larger than the matrix volume, preferably 2 to 3 times as much, and on the other hand, a washing and draining valve is provided in the flush channel on the inflow side of the matrix, and the space is By sealing the high-temperature, high-pressure water that has passed offshore and opening the washing drain valve to reduce the pressure inside the flash tank, the high-temperature, high-pressure water is depressurized and a part of it evaporates, causing the water in the space to expand due to volume expansion. This is a cleaning method in which the cladding adhering to the steel wool is peeled off and removed by rapidly circulating it in the matrix and using the shearing force of the cladding. According to experiments, in a steel wool matrix, the average wire diameter is about 50μ, and the packing density is 6.
~8%, when the matrix height is approximately 15077Z77Z, the matrix differential pressure at the effective cleaning flow rate is 1
The range is ~10k9f1c, and the optimal value is 2~5k
gfIC? The FL range was set. The self-energy for obtaining such a pressure difference is 130'C)3k9f1c
In the case of brushing with high-temperature, high-pressure water of this level, it is convenient and effective to discharge and mix the flush wastewater to atmospheric pressure or into cold water at atmospheric pressure stored in a flash tank. It is.
In the case of high-temperature, high-pressure water with temperatures exceeding 180°C and 10k9f1c11, the self-energy is too high, and if brushing is continued, thermal stress will occur in the flash drain piping and flash tank in addition to stress due to pressure, and the generated steam will There is a risk that the amount will become large and cause damage to the piping and flash tank. Therefore, it is impractical and economically disadvantageous because it requires thick-walled piping and a large-capacity flash tank. It is an object of the present invention to provide a cleaning method and a cleaning device for a high gradient electromagnetic filter, in which the matrix can be cleaned safely and economically using the self-energy of such high-temperature, high-pressure water.

The gist of the electromagnetic filter cleaning method of the present invention is that when cleaning a high-gradient electromagnetic filter that passes high-temperature, high-pressure water by magnetizing the matrix, the cleaning water held in the space on the outflow side of the Mato 3 socks is removed. 130-1 by heating or cooling
By flushing to the matrix inlet side after adjusting to a temperature range of 80'C, the matrix is heated using the self-energy of the wash water held in the matrix outlet side in 4. It is characterized by being washed.
In the cleaning method of the present invention, the temperature range of the cleaning water is 130 to 180°C in consideration of work safety;
Considering the cleaning function, the temperature is preferably 140 to 160°C.

That is, if the initial temperature of the wash water held in the canister space exceeds 180°C, cooling is performed, and if it is less than 130°C, heating is performed. In this case, the cooling method used is water cooling, air cooling, etc., and the heating method used is a method using steam or other general heat medium, an electric heating method, etc. As for the heat transfer method, indirect heating is preferred, but direct heating is also possible. As the temperature control mechanism attached to the electromagnetic filter of the present invention, a corrugated tube type heat transfer device, a jacket type heat transfer device, a fin type heat transfer device, etc. are possible.

In the case of the corrugated pipe type and jacket type, both cooling and heating can be used. Specific examples of electric heating devices include so-called ribbon heaters and sheathed heaters, and specific examples of direct heating devices include high-temperature, high-pressure water vapor injection nozzles. To describe an embodiment of the present invention with reference to the drawings, in FIG. 1, a matrix 2 is held in a canister 1 by a ball piece 3, and is arranged on an outflow side of filtrate water and an inflow side of water to be treated. A space 4 and a space 5 are defined.

A perforated plate or the like is used for the ball piece 3, and the ball piece 3 serves to hold the matrix 2 made of steel wool or the like and at the same time to uniformly distribute water passage. The exterior of the matrix 2 is surrounded by an electromagnetic filter 6, and when direct current flows through the electromagnetic filter 6, the matrix 2 is magnetized, and the magnetic flux lines converge on the sharp portions of the steel wool. Constructed to generate high gradients. Furthermore, the space 4 on the matrix flow side has a volume that is at least more than the volume of the matrix 2, preferably 2 to 3 times, and has a cooling water corrugated pipe 7 inside, so that the space 4 can be opened by flowing cooling water. The temperature of the high-temperature, high-pressure water in the chamber 4 is cooled to 130 to 180°C. In the filtration process, high-temperature, high-pressure water of approximately 200°C and 16k9f1c to be treated enters the space 5 of the canister 1 through the inlet valve 10, and then, while passing through the matrix 2, the crud is removed and the filtrate is From the space 4, it returns to the system via the outflow valve 11.

As this filtration continues, crud will accumulate in the matrix 2 and the differential pressure will increase, or the quality of the filtrate will deteriorate due to a decline in the filtration function, so when these are detected, the filtration is interrupted and the cleaning process is started. . When entering this cleaning process, first close the valve 11 and then the valve 10, and then close the electromagnetic coil 6 during the filtration process.
Cut off the direct current that was being energized. In this way, the high-temperature, high-pressure water is retained within the entire space of the canister 1 as it is. Next, cooling water is caused to flow through the cooling water corrugated pipe 7 to cool the temperature of the high-temperature, high-pressure water in the space 4 to 130 to 180°C. If the flush valve 12 is suddenly opened in such a state, 13
High-temperature, high-pressure water cooled to 0 to 180°C is depressurized to below the saturation pressure, and a portion of it evaporates and expands in volume.
The water in the space 4 rapidly flows down inside the matrix 2, and the shearing force causes the crud attached to the steel wool to be peeled off and removed. The second illustrated example is a cooling system in which a jacket 8 is used as a cooling device for the space 4.

That is, a jacket 8 is wrapped around the outer circumferential portion of the canister 1 that forms the space 4, and the high temperature and high pressure water in the space 4 is heated to 130 to 180 degrees Celsius by passing cooling water.
It is configured to be cooled to Furthermore, the third illustrated example is a case where fins 9 are used as a cooling device for the space 4.

That is, a structure is adopted in which fins 9 are attached to the outer circumferential portion of the canister 1 that forms the space 4 to increase heat radiation, and the temperature of the high temperature and high pressure water in the space 4 is similarly reduced to 130 to 1
It is configured to be cooled to 80°C. Note that the above embodiment is a case in which one of a serpentine type, jacket type, and fin type heat transfer device is attached to the canister, but these heat transfer devices and the above-mentioned electric heating type heating device, etc. can be installed in an appropriate combination. It's okay. For example, a corrugated tube heating device and a fin air cooling device can be attached to one canister. According to the present invention, the matrix of the electromagnetic filter can be cleaned safely and economically without the need for complicated control by adding a simple cooling device and/or heating device, and the matrix of the electromagnetic filter can be cleaned safely and economically. This simplifies the operation and maintenance of the machine, greatly improves the cleaning function, and enables highly safe work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a case where a corrugated pipe cooling device is attached inside the canister, and FIG. 2 is a longitudinal cross-sectional view of a case where a jacket-type cooling device is attached outside the canister. FIG. 3 is a longitudinal cross-sectional view of the case where air-cooled fins are attached to the outside of the canister. 1...Canister, 2...Matrix, 3
... Ball piece, 4, 5 ... Space, 6 ... Electromagnetic coil, 7 ... Cooling water pipe, 8 ... Jacket, 9 ... Fin, 105 ... Inflow valve, 11.・
-Outflow valve, 12...flush valve.

Claims (1)

[Claims] 1. When cleaning a high-gradient electromagnetic filter that filters high-temperature, high-pressure water by magnetizing a matrix, the cleaning water held in the space on the outflow side of the matrix is heated or cooled to a temperature of 130 to 180%. A method for cleaning an electromagnetic filter, which comprises adjusting the temperature to a temperature range of 0.degree. C. and then flushing to the matrix inflow side. 2 Equipped with a canister, electromagnetic coil, and matrix,
A high-gradient electromagnetic filter for filtering high-temperature, high-pressure water has a valve for flushing wash water on the inflow side of the matrix, and the matrix is provided in the canister space and/or around the canister wall on the outflow side of the matrix. A cleaning device for an electromagnetic filter, characterized in that a temperature adjustment mechanism is provided for adjusting the temperature of cleaning water held in the canister space on the outflow side. 3. The device according to claim 2, wherein the temperature adjustment mechanism is a serpentine heat transfer device. 4. The device according to claim 2, wherein the temperature adjustment mechanism is a jacket type heat transfer device. 5. The device according to claim 2, wherein the temperature adjustment mechanism is a fin type heat transfer device. 6. The device according to claim 3, wherein the snake-type heat transfer device is a water-cooled cooler. 7. The device according to claim 4, wherein the jacket type heat transfer device is a water-cooled cooler. 8. The device according to claim 5, wherein the fin type heat transfer device is an air cooling fin.