JPS589615Y2 - electromagnetic filter - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electromagnetic filter filled with a packing consisting of a large number of alternating layers of particulate and wool-like magnetic materials inside an r-filtering column, and the stacked packing is combined into one layer. This invention relates to an electromagnetic filter that is housed in an inner cylinder and filled with a plurality of inner cylinders stacked in multiple stages.

Conventionally, electromagnetic filters have been filled with only wool-like magnetic material in the r-filter column, or with only particulate magnetic material. Various types of electromagnetic filters are used which purify liquid by disposing these magnetic fillers and causing the magnetic particles to be attracted to the magnetic fillers.

First, we will explain an electromagnetic filter that uses only a wool-like magnetic material as a filling material in the r-pass tower (hereinafter referred to as a "wool-like electromagnetic filter").A wool-like electromagnetic filter forms a large magnetic field gradient near the wool-like magnetic material. The principle of removing magnetic particles in this case is shown by the following equation.

For example, when a magnetic fine particle with a magnetic susceptibility of X1 and a volume of V exists in a magnetic field H, the attraction force F acting on the magnetic fine particle is given by
Based on the formula F, the only way to increase H, that is, the magnetic field, is to increase the (ampere) x (number of turns) of the electromagnetic coil, and this has the disadvantage that when using a wool-like electromagnetic filter, the electromagnetic coil must be made larger. Instead of increasing the size of the electromagnetic coil by generating a magnetic field H, or by holding the magnetic field H at a certain value, the magnetic field gradient HdX, that is, the magnetic field gradient, must be increased.

However, in order to make the magnetic field gradient uniform, the wool-like magnetic material must be made of thin wire, which has the drawbacks that cleaning becomes difficult and the thin wire breaks, making it difficult to handle. Ta.

In addition, in conventional wool-like electromagnetic filters, the wool-like magnetic material is placed inside the filter tower, and the layer height of the wool-like magnetic material is usually 200 mm.
However, it is difficult to pack the wool-like magnetic material into the p-filter column with a uniform packing density, and especially when the button is pressed in a large magnetic field, the packing may be uneven. The wool-like magnetic material in the structure is locally expanded in density, causing uneven flow of raw water and short paths, resulting in performance deterioration.

Next, we will explain an electromagnetic filter that uses only particulate magnetic material as a filler (hereinafter referred to as particulate electromagnetic filter).Due to the characteristics of its structure, the porosity of particulate magnetic material is 30.
〜55, and the porosity of the wool-like magnetic material is 93〜
It has a structure that is packed much more densely than the 96 type, and therefore, the magnetic field strength in the filling can be made high without making the electromagnetic coil that large.

However, there was a drawback in that B could not be used as a base for the poem.

The present invention improves both the magnetic field gradient (1) and the magnetic field strength (1) by alternately stacking wool-like magnetic material and particulate magnetic material in a direction perpendicular to the magnetic flux. It is smaller than the conventional one, has a larger porosity than particulate magnetic material, has a smaller electromagnetic coil than a wool-like electromagnetic filter, and has a higher attractive force as a filler for the electromagnetic filter. The purpose is to improve the performance of the

The present invention will be explained below using the drawings.

FIG. 1 is an explanatory diagram showing an example of an embodiment of the electromagnetic filter of the present invention, in which a particulate magnetic material 1 and a wool-like magnetic material 2 are alternately placed in a perpendicular direction to the magnetic flux in a drainage tower 3. A large number of filters are stacked and packed, and a perforated plate 4 with fluid permeability is attached to the bottom of the filter tower 3.

Note that the particulate magnetic material 1 usually has a particle size of 5 mm to 201n1n.
Use the one.

Further, as the wool-like magnetic material 2, it is preferable to use a wool-like thin wire having a wire diameter of 40 μm to 85 μm.

In the electromagnetic filter of the present invention, the respective layer heights of the particulate magnetic material 1 and the wool-like magnetic material 2 are relatively important factors.

Unless this layer height is set to an appropriate value, the intended purpose cannot be achieved.

As a result of various studies by the inventors of the present invention, it was found that the height Wl of one stage of the particulate magnetic material 1 should be 5 mm to 20 mm, and the height W2 occupied by the wool-like magnetic material 2 should be 5 mm to 20 mm. did.

Furthermore, the ratio of the respective heights, that is, Wl:W2=4:
1-1. : It is best to select the most suitable value in the range of 4 depending on the properties of the raw water quality.

We also compared the current and magnetic field strength of an electromagnetic filter filled with a filler made of alternating layers of particulate magnetic material and wool-like magnetic material of the present invention and a conventional wool-like electromagnetic filter. Shown in Figure 2.

In addition, in Figure 2, A is the case when the filtering tower is not filled with anything, that is, when it is empty, B is the conventional wool-like electromagnetic filter, and C and D are the electromagnetic filters of the present invention. If the layer height of C is 10 mm for the particulate magnetic material and the layer height for the wool-like magnetic material is 10 mm, that is, the layer height ratio is 1=1, and the layer height is 10 mm, D is the particle height. The layer height of the shaped magnetic material and the layer height of the wool-like magnetic material are each 1.
0 mm, Ly, and 6 points, that is, the layer height ratio is set to 1.66:1, and the magnetic field strength and current value are shown.

As is clear from FIG. 2, the magnetic field strength of the electromagnetic filters CJ- and D of the present invention is much higher than that of the conventional electromagnetic filter B.

For example, the strength of the magnetic field in the filling is 1,500 gauss.
In the case of the wool-like electromagnetic filter, that is, B, the current value required to generate is 14.2 amperes, while in the case of the electromagnetic filter of the present invention, it is 8.8 amperes in case of C, and in the case of DK button. It requires only 5.7 amperes of current.

An example of the embodiment of the electromagnetic filter of the present invention is shown in FIG. 1, but in another embodiment, as shown in FIG. The inner cylinders 2 and 2 may be stacked alternately, and a plurality of inner cylinders 5 and 5 may be installed in multiple stages in the filtration tower 3 depending on the quality of the raw water, as shown in FIG.

Generally, when too much load is applied to the wool-like magnetic material 2, the porosity decreases due to compaction, and therefore, even in the present invention, the number of laminated layers of the particulate magnetic material and the wool-like magnetic material is limited to some extent.

Therefore, in the electromagnetic filter shown in FIG. 1, which is an embodiment, it is preferable to use a combination of five layers of particulate magnetic material and four layers of wool-like magnetic material.

In this way, the number of laminated layers of both magnetic materials is limited to some extent, which causes a problem, for example, when the capacity is set to 1.
If both magnetic materials are laminated and filled in the inside, and this inner cylinder 5 is filled in the filter tower 3 in multiple stages as shown in FIG. 4, the wool-like magnetic material 2
This is advantageous because it does not put much load on it.

In addition, the flow when removing magnetic particles using the electromagnetic filter of the present invention is as shown in FIG. The treated water is passed through a magnetic field and collected from the treated water outlet pipe 8.

Water flow is generally carried out in a downward flow, but it may also be carried out in an upward flow.

The end point of the water flow process is the differential pressure indicating alarm meter 9 attached to the filtration tower 3.
It is best to detect it with .

In the so-called cleaning process for discharging the magnetic particles accumulated in the filter tower 3, after switching the necessary valves and demagnetizing the electromagnetic coil 7, the cleaning water from the cleaning water inlet pipe 10 and the gas inlet pipe are washed in an upward flow. It is treated with a mixed flow of gas from 11 and discharged from backwash drain pipe 12.

In this case, cleaning may be carried out using only cleaning water, but the cleaning effect can be further enhanced by blowing in the scum.

As described above, according to the present invention, it is possible to have an excellent effect of removing magnetic fine particles, and also to be able to easily clean the particles, thereby saving the amount of cleaning liquid.

Examples of the present invention will be described below.

Example■ *The electromagnetic filter of the present invention was tested under the water flow conditions shown in Table 1.
The performance of a conventional wool electromagnetic filter and a particulate electromagnetic filter was compared, and the results are shown in Table 2.

Example 2 The respective performances were compared under the water flow conditions shown in Table 3, and the results are shown in FIG.

Note that Table 4 shows the conditions of the filling material.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and Fig. 1 is an explanatory diagram of an r-tower in which the particulate magnetic material of the present invention and the wool-like magnetic material are laminated, and Fig. 2 shows the electromagnetic filter of the present invention and the conventional one. This is a graph comparing the current and magnetic field strength for the electromagnetic filter, where the vertical axis shows the strength of the magnetic field in the filling, and the horizontal axis shows the current value. Fig. 3 is an explanatory diagram of a particulate magnetic material and a wool-like magnetic material housed in an inner cylinder, and Fig. 4 is an explanatory diagram of a case in which the inner cylinders shown in Fig. 3 are stacked and packed in a filtration tower. Figure 5 is a blow showing the filtration process and washing process of the present invention, and Figure 6 is the F of Example-2.
This is a graph comparing the electromagnetic filter of the present invention and the conventional electromagnetic filter in terms of e3O4 concentration and operation time, and the vertical axis is Fe50. i concentration, the horizontal axis shows the operating time. 1... Particulate magnetic material, 2... Wool-like magnetic material, 3.
... Sawadori tower, 4 ... Perforated plate, 5 ... Inner cylinder, 6 ...
Raw water inlet pipe, 7... Electromagnetic coil, 8... Treated water outlet pipe, 9... Differential pressure indicator and alarm gauge, 10... Cleaning water inlet pipe, 11... Gas inlet pipe, 12...・Backwash drain pipe.

Claims (2)

[Scope of utility model registration request] (1) An electromagnetic filter characterized in that a single tower of the electromagnetic filter is filled with a packing in which a large number of particulate magnetic substances and wool-like magnetic substances are alternately laminated in a direction perpendicular to the magnetic flux. (2) A filling in which a large number of particulate magnetic materials and wool-like magnetic materials are alternately laminated in a direction perpendicular to the magnetic flux is housed in an inner cylinder, and this inner cylinder is placed in a plurality of layers within the f-filter of the electromagnetic filter. An electromagnetic filter according to claim (1) of the utility model registration claim, which is implemented in multiple stages.