JPH10109009A - Magnetic filter washing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic filter washing system capable of efficiently washing the system without enlarging the capacity of the magnetic filter. SOLUTION: A by-pass line 8 hypassing the magnetic filter is used at the time of washing the magnetic filter 1, and a waste washing water after washing the magnetic filter is passed to a waste water tank by using a washing water line supplying a high temp. and high pressure water of the plant as a washing water from a downstream side which is recourse to a removing time of impurities. In this way, the washing is executed for an optical time and also efficiently without enlarging the capacity of the magnetic filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic filter cleaning system for cleaning a magnetic filter installed in a high-temperature high-pressure water system for removing impurities contained in high-temperature high-pressure water.

[0002]

2. Description of the Related Art For example, a high-temperature high-pressure water system such as a boiler circulating water system of a power plant is provided with a magnetic filter for removing impurities contained in the circulating water. This magnetic filter magnetizes a filter matrix filled with magnets to trap impurities in high-temperature and high-pressure water. Then, the magnetic filter is washed to remove the trapped impurities.

FIG. 6 is a configuration diagram showing a conventional example. The magnetic filter 1 is filled with a filter matrix 2 for trapping impurities. An electromagnetic coil 3 is provided outside the magnetic filter 1 and becomes an electromagnet when a power source is applied to generate a magnetic field in the filter container to magnetize the filter matrix. Then, the magnetic impurities in the high-temperature and high-pressure water are captured by the magnetized filter matrix. The treated water line 4 has a valve 5
The high-temperature and high-pressure water is supplied to the magnetic filter 1 through the magnetic filter 1 so that the high-temperature and high-pressure water that has passed through the magnetic filter 1 and from which impurities have been removed is returned to the plant through the valve 6. .

A bypass line 8 for bypassing the magnetic filter 1 is provided. When the magnetic filter 1 is washed, a valve 7 is opened, and the bypass valve is activated. On the other hand, the washing line 9 supplies the waste washing water that has washed the magnetic filter 1 through the valve 10 to the wastewater tank 1.
1 is connected.

In the system configured as described above, during normal operation, high-temperature and high-pressure water of high temperature and high pressure is sent to the magnetic filter 1 through the valve 5 and the filter matrix 2 excited by the electromagnetic coil 3 removes iron oxide and the like in the water. Impurities have been removed. High-temperature, high-pressure water from which impurities have been removed
It is returned to the plant through valve 6.

When the filter matrix 2 is to be washed, first, the valve 7 is opened and the valves 5 and 6 are opened.
Is closed and high-temperature and high-pressure water is passed through the bypass line 8. next,
After the energization of the electromagnetic coil 3 was stopped, the valve 10 was opened at a stretch, and the washing water was supplied to the waste water tank 11 previously filled with high-pressure gas or filled with cold water. That is, high-temperature and high-pressure water retained in the magnetic filter 1 is flushed to the wastewater tank 11 at a stretch as washing water.

[0007]

However, in such a conventional apparatus, since the amount of washing water is limited by the capacity of the magnetic filter 1, if it is desired to improve the washing degree, the washing is repeated a plurality of times. It is necessary to increase the capacity of the magnetic filter 1 or increase the amount of water that can be held.

Accordingly, an object of the present invention is to provide a magnetic filter cleaning system capable of effectively cleaning without increasing the capacity of the magnetic filter.

[0009]

According to the first aspect of the present invention, there is provided a bypass line for bypassing a magnetic filter at the time of cleaning a magnetic filter, and a high-temperature high-pressure water at the time of cleaning the magnetic filter from a downstream side opposite to that at the time of removing impurities. The washing machine is provided with a washing water line for supplying the washing water to the magnetic filter, and a waste water tank for receiving the waste washing water after washing the magnetic filter.

According to the first aspect of the present invention, at the time of cleaning the magnetic filter, a part of the high-temperature and high-pressure water of high temperature and high pressure is continuously flowed into the cleaning water line, and the remainder is flowed through the bypass line. This makes it possible to secure the cleaning water.

According to a second aspect of the present invention, in the first aspect, a heat exchanger for cooling the waste washing water is provided between the magnetic filter and the wastewater tank.

According to the second aspect of the present invention, the waste washing water is cooled before flowing into the waste water tank.

[0013] The invention of claim 3 is claim 1 or claim 2.
In the invention, a flow meter for detecting a flow rate of the washing water supplied to the magnetic filter is provided, and the flow rate of the washing water detected by the flow meter is controlled to be a predetermined value.

According to the third aspect of the present invention, in addition to the operation of the first or second aspect of the present invention, the flow rate of the washing water is controlled to maintain a stable plant operation.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In the invention, a differential pressure gauge for detecting a differential pressure between the entrance and the exit of the magnetic filter is provided, and when the differential pressure detected by the differential pressure gauge exceeds a predetermined value, washing of the magnetic filter is started by utilizing the bypass line and the washing water line. It is like that.

According to a fourth aspect of the present invention, in addition to the functions of the first to third aspects, when the pressure difference between the inlet and the outlet of the magnetic filter reaches a predetermined value, the washing is automatically started to recover the pressure loss. Rinse the washing water continuously.

The invention according to claim 5 is the invention according to claims 1 to 4.
In the invention, a thermometer for detecting the outlet temperature of the waste washing water of the heat exchanger is provided, and the temperature of the waste washing water detected by the thermometer is controlled to be a predetermined value.

According to the fifth aspect of the present invention, in addition to the functions of the first to fourth aspects of the present invention, the waste washing water is made safe and easy to treat.

[0019]

Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram showing a first embodiment of the present invention. This first embodiment is different from the conventional example shown in FIG. 6 in that high-temperature, high-pressure water is supplied to the magnetic filter 1 as cleaning water from the downstream side opposite to that at the time of removing impurities when the magnetic filter 1 is cleaned. A water line 9a is provided.
The cleaning water line 9a is utilized through the valve 12.

In FIG. 1, the electromagnetic coil 3 becomes an electromagnet when a power is applied, and either a normal conducting magnet or a superconducting magnet may be used. Also, the electromagnetic coil 3
Alternatively, a permanent magnet may be used.

The washing water line 9a is connected to the treated water line 4 on the upstream side of the valve 5, and the washing water line 9a is provided with a valve 12. Then, high-temperature and high-pressure water is supplied to the magnetic filter 1 as cleaning water through the valve 12. That is, the high-temperature and high-pressure water is supplied from the upstream side to the valve 12.
The washing water supplied to the magnetic filter 1 through the washing line 9b is supplied to the magnetic filter 1 through the washing line 9b.
To the wastewater tank 11 via the valve 10 of FIG.

The waste water tank 11 is provided with a steam line 13 for taking out steam from the waste water tank 11, and the steam is taken out through a steam valve 14. On the other hand, the wastewater from the wastewater tank 11 is taken out from the wastewater line 15 via the wastewater valve 16. Further, the wastewater tank 11 is configured to be supplied with water from a water supply line 17 via a water supply valve 18.

During normal operation, high-temperature high-pressure water is sent to the magnetic filter 1 through the valve 5, and impurities such as iron oxide in the water are removed by the filter matrix 2 excited by the electromagnetic coil 3. The water from which impurities have been removed is returned to the plant through valve 6.

When the filter matrix 2 is to be washed, the water supply valve 18 is opened, water is supplied from the water supply line 17 to the wastewater tank 11, and cold water is filled in advance. The amount of the cold water is set so as not to exceed 100 ° C. even when mixed with high-temperature and high-pressure washing water. Then, the valve 7 is opened, the valves 5 and 6 are closed, and high-temperature and high-pressure water is passed through the bypass line 8.

Next, after the energization of the electromagnetic coil 3 is stopped, the valves 10 and 12 are opened. In the case of a permanent magnet, move the magnet or insert a shielding plate and use a magnetic filter 1
After removing the internal magnetic field, the valves 10 and 12 are opened. The water in the magnetic filter 1 at high temperature and high pressure flows into the water in the waste water tank 11 while removing impurities adhering to the filter matrix 2 when expanding, and is mixed with cold water. Since a part of the high-temperature and high-pressure water flowing through is supplied continuously as the washing water, the amount of the washing water is not limited and the washing can be performed for an arbitrary time.

Therefore, in the electromagnetic filter cleaning system according to the first embodiment, cleaning can be continued for an arbitrary time without increasing the size of the magnetic filter 1, and effective cleaning can be performed. .

Next, a second embodiment of the present invention will be described. FIG. 2 is a configuration diagram showing a second embodiment of the present invention. The second embodiment differs from the first embodiment shown in FIG. 1 in that a heat exchanger 19 for cooling waste washing water is provided between the magnetic filter 1 and the waste water tank 11. It is. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

In FIG. 2, a heat exchanger 19 is provided between the magnetic filter 1 and the valve 10 in the washing water line 9b. In this case, the wastewater tank 11 does not need to be a pressure vessel and may be an open tank.

First, the washing procedure is the same as that of the first embodiment, except that the high-temperature and high-pressure waste washing water flowing from the magnetic filter 1 is cooled to less than 100 ° C. in the heat exchanger 19,
The pressure is reduced by the valve 10 and enters the wastewater tank 11.

Thus, the waste washing water is supplied to the washing line 9b.
Is cooled by the heat exchanger 19, and the pressure is reduced by the valve 10 downstream of the heat exchanger 19, so that the wastewater tank 11 does not need to be a pressure vessel. Further, it is not necessary to fill the wastewater tank 11 with cold water in advance. Therefore, workability is easy and wastewater management is easy.

Next, a third embodiment of the present invention will be described. FIG. 3 is a configuration diagram showing a third embodiment of the present invention. The third embodiment is different from the second embodiment shown in FIG. 2 in that a flow meter 20 for detecting the flow rate of the washing water supplied to the magnetic filter 1 is provided. The control device 21 controls the cleaning water flow rate to a predetermined value.
This controls the valve 12.

In FIG. 3, a flow meter 20 for detecting the flow rate of the washing water is installed in the washing water line 9a.
0 is connected to the control device 21 by a cable. Also,
A valve opening command from the control device 21 is output to the valve 12. That is, the flow signal detected by the flow meter 20 is sent to the control device 21, and the deviation between the detected flow signal and a predetermined set value is obtained. Then, the opening of the valve 12 is adjusted based on the deviation. Here, the set value in this case may be the set value of the flow rate of the cleaning water flowing through the cleaning line 9a or the set value of the ratio between the flow rate of the high-temperature and high-pressure water flowing through the bypass line 8 and the flow rate of the cleaning water flowing through the cleaning line 9a. good.

Therefore, in the third embodiment, it is possible to prevent the flow rate of the washing water from becoming excessively large, so that the flow rate of the main stream to the plant is not drastically reduced, and the filter is operated while the plant is operating stably. Washing can be performed.

Next, a fourth embodiment of the present invention will be described. FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention. This fourth embodiment is different from the third embodiment shown in FIG. 3 in that a differential pressure gauge 22 for detecting the differential pressure between the entrance and exit of the magnetic filter 1 is provided. When the predetermined value is exceeded, the cleaning of the magnetic filter 1 is started by utilizing the bypass line 8 and the washing water line 9a.

In FIG. 4, a differential pressure gauge 22 for measuring the differential pressure of the filter matrix 2 is installed in the magnetic filter 1, and the differential pressure detected by the differential pressure gauge 22 is input to the control device 21.

During normal operation, high-temperature high-pressure water is sent to the magnetic filter 1 through the valve 5, and impurities such as iron oxide in the water are removed by the filter matrix 2 excited by the electromagnetic coil 3. The water from which impurities have been removed is returned to the plant through valve 6.

The differential pressure gauge 22 monitors the differential pressure between the inlet and the outlet of the filter matrix 2. When the differential pressure rises above a certain value, the controller 21 recognizes this and shifts to the cleaning step. In the cleaning process, the following operation is performed by the control device 21. First, the valve 7 is opened and the valves 5 and 6 are closed to flow high-temperature and high-pressure water through the bypass line 8. Thereafter, energization of the electromagnetic coil 3 is stopped. And valve 10 and valve 1
2 is opened and a part of high-temperature and high-pressure water is continuously washed 9
Pour into a. As a result, the impurities trapped in the filter matrix 2 are flowed to the wastewater tank 11 through the washing water line b at high temperature and high pressure, and the magnetic filter 1 can be washed.

When the differential pressure has recovered to some extent, the washing process is automatically switched to the normal operation. The recovery of differential pressure
It may be determined that the recovery has occurred when the differential pressure has decreased to a certain value, or it may be determined that the recovery has occurred when the range of the change has been reduced by looking at the change in the differential pressure during the cleaning process. It is also possible to provide a timer in the control device 21 so that when the differential pressure does not recover easily, the cleaning is forcibly terminated and an alarm is issued.

Therefore, in the fourth embodiment, the cleaning end time can be determined by monitoring the differential pressure, so that unnecessary cleaning is not performed, and effective cleaning can be performed in an appropriate time. Can be.

Next, a fifth embodiment of the present invention will be described. FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention. The fifth embodiment is different from the second embodiment shown in FIG. 2 in that a thermometer 23 for detecting the outlet temperature of the heat exchanger 19 is provided, and the waste water detected by the thermometer 23 is provided. The controller 21 controls the opening of the valve 24 so that the temperature becomes a predetermined value.

In FIG. 5, a thermometer 23 is provided at the outlet of the heat exchanger 19 on the side of the washing water line. Heat exchanger 1
A valve 24 is installed at the low-temperature-side inlet of 9. Thermometer 2
3 monitors the high-temperature side outlet temperature of the heat exchanger 19 and adjusts the flow rate on the low-temperature side by the valve 24 so as to reach a preset temperature. Therefore, in the fifth embodiment,
Since the temperature of the waste washing water can be reliably kept within a certain range, the treatment of the waste washing water can be performed more safely.

[0042]

As described above, according to the present invention, high-temperature and high-pressure washing water can be continuously flowed through the magnetic filter. The cleaning can be performed effectively for an arbitrary time without increasing the capacity.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 magnetic filter 2 filter matrix 3 electromagnetic coil 4 treated water line 5, 6, 7, 10, 12, 24 valve 8 bypass line 9 washing water line 11 wastewater tank 13 steam line 14 steam valve 15 wastewater line 16 wastewater valve 17 water supply line 18 Water supply valve 19 Heat exchanger 20 Flow meter 21 Controller 22 Differential pressure gauge 23 Thermometer

Claims (5)

[Claims] 1. A magnetic filter cleaning system installed in a high-temperature and high-pressure water system for cleaning a magnetic filter for removing impurities contained in the high-temperature and high-pressure water, comprising: a bypass line for bypassing the magnetic filter when cleaning the magnetic filter. A washing water line for supplying the high-temperature and high-pressure water to the magnetic filter as washing water from a downstream side opposite to that at the time of removing the impurities when washing the magnetic filter, and a waste washing water after washing the magnetic filter. A magnetic filter cleaning system comprising a receiving wastewater tank. 2. The magnetic filter cleaning system according to claim 1, wherein a heat exchanger for cooling the waste cleaning water is provided between the magnetic filter and the waste water tank. 3. A flow meter for detecting a flow rate of the washing water supplied to the magnetic filter, wherein the flow rate of the washing water detected by the flow meter is controlled to be a predetermined value. The magnetic filter cleaning system according to claim 1 or 2, wherein 4. A differential pressure gauge for detecting a differential pressure between an inlet and an outlet of the magnetic filter, and when the differential pressure detected by the differential pressure gauge exceeds a predetermined value, the magnetic field is utilized by utilizing the bypass line and the washing water line. 4. The magnetic filter cleaning system according to claim 1, wherein the cleaning of the filter is started. 5. The apparatus according to claim 1, further comprising a thermometer for detecting an outlet temperature of the heat exchanger, wherein the temperature of the waste washing water detected by the thermometer is controlled to a predetermined value. Item 6. A magnetic filter cleaning system according to Item 4.