JPH08332365A - Powder and fluid mixing apparatus - Google Patents

Abstract

PURPOSE: To mix an iron powder and water flowing through a main flow pipe by allowing the iron powder in a reservoir tank to flow through the main flow pipe without pressurizing the iron powder. CONSTITUTION: Superconductive magnets 5, 6 are respectively arranged on the upstream and downstream sides of a main flow pipe 2 through which water 12 is allowed to flow from a reservoir tank 3 so as to hold. the powder supply pipe 4 communicating with the main flow pipe 2 therebetween and excited to form a magnetic field B between the superconductive magnets 5, 6 and, since the electromagnetic force F (=χ.B.dB/dz) toward the main flow pipe 2 acts on an iron powder 11 with susceptibility χ, the iron powder 11 in the reservoir tank 3 is moved toward the main flow pipe 2. Backward electromagnetic force F' is generated when the iron powder 11 passes a symmetric point P but the iron powder is continuously moved as it is by the synthetic force of inertial force Fi and the suction force of the water 12 flowing through the main flow pipe 2 to flow in the main flow pipe 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder / fluid mixing apparatus for mixing a fluid and a powder in, for example, an iron-making plant or a petrochemical plant. The present invention relates to a powder / fluid mixing device that enables low-cost and high-efficiency mixing.

[0002]

2. Description of the Related Art As a powder / fluid mixing apparatus for mixing a powder made of a magnetic material with a fluid, for example, an apparatus for mixing iron powder as a magnetic material and a fluid as a liquid in an iron making plant is used. is there. Such a powder / fluid mixing device
This will be described below with reference to FIG. 5 which is a schematic sectional configuration explanatory view. Reference numeral 52 shown in the figure is a mainstream pipe horizontally arranged in which the fluid 12 flows, and a reservoir tank 53 is provided in the mainstream pipe 52. A vertical powder supply pipe 54 provided at the bottom of the is communicating. Iron powder 61 is put in the reservoir tank 53, and the iron powder 61 is pressurized by a pressure pump 55 and supplied to the mainstream pipe 52 via the powder supply pipe 54. .

Hereinafter, the powder / fluid mixing apparatus 5 having the above-mentioned configuration
Explaining the operation mode of No. 1, the internal pressure of the reservoir tank 53 is 5 × 10 ^{5 to} 6 × 10 ⁵ by the operation of the pressurizing pump 55.
When the pressure reaches Pa, the iron powder 61 in the reservoir tank 53 is jetted into the mainstream pipe 52 via the powder supply pipe 54, and the iron powder 61 which continues to jet is merged with the fluid 12 flowing in the mainstream pipe 52 to be mixed. At the same time, the mixed fluid 13 composed of the iron powder 61 and the fluid 12 is fed to the next step.

Incidentally, what is communicated with the upper side of the reservoir tank 53 is a powder supply base pipe 56 having a valve 57 interposed therein. When the iron powder 61 is supplied into the reservoir tank 53, the valve 57 is opened,
Further, the iron powder 61 in the reservoir tank 53 is fed to the pressurizing pump 55.
It is a batch system in which the valve is closed when the iron powder 61 is supplied to the mainstream pipe 52 by pressurizing.

[0005]

In the powder / fluid mixing apparatus according to the conventional example having the above structure, as described above, the reservoir tank needs to be a high-pressure container capable of withstanding a high pressure of 5 × 10 ^{5 to} 6 × 10 ⁵ Pa. However, there is a problem to be solved economically that the price of the reservoir tank increases and the powder / fluid mixing device becomes expensive because it is subject to the regulation of the High Pressure Gas Control Law. Furthermore, since this powder / fluid mixing device is a batch system, the problem that the mixing efficiency of powder and fluid is low and the valve wears out due to repeated valve operation, so the maintenance cost of the powder / fluid mixing device is low. However, there was a problem to be solved that

Therefore, an object of the present invention is to make the reservoir tank thin so that the apparatus itself is inexpensive, the powder and the fluid can be mixed with high efficiency, and the maintenance cost can be reduced. The purpose is to provide a powder / fluid mixing device that makes it possible.

[0007]

In order to solve the above-mentioned problems, the means adopted by the powder / fluid mixing apparatus according to claim 1 of the present invention is a main flow pipe through which a fluid is flown, from a reservoir tank to a magnetic material. In a powder / fluid mixing device for mixing the fluid and the powder, in which a powder supply pipe for supplying the powder is in communication, at least an upstream side and a downstream side of the mainstream pipe sandwiching the powder supply pipe. A magnet that exerts a magnetic force on the mainstream pipe and the powder supply pipe is arranged at each of positions near the outside of the mainstream pipe.

The means adopted by the powder / fluid mixing apparatus according to claim 2 of the present invention is the powder / fluid mixing apparatus according to claim 1, wherein the magnet is a superconducting magnet.

[0009]

According to the powder / fluid mixing apparatus of the first aspect of the present invention, the magnetic force of the magnet causes the powder made of the magnetic material in the reservoir tank to be supplied to the mainstream pipe via the powder supply pipe. Then, since the powder and the fluid flowing through the mainstream pipe are mixed, it is not necessary to use a reservoir tank that can withstand high pressure, it is not necessary to use a batch system, and the supply of powder from the reservoir tank to the mainstream pipe is continued. However, powder can be continuously supplied to the reservoir tank.

According to the powder / fluid mixing apparatus of the second aspect of the present invention, since the superconducting magnet is used, the power consumption can be saved.

[0011]

EXAMPLE A powder / fluid mixing apparatus according to Example 1 of the present invention will be described below with reference to FIG. 1 (a), which is a schematic sectional configuration explanatory view, FIG. Is a moving speed (g / min) of iron powder, and the maximum magnetic field strength (T) is taken on the horizontal axis. An explanatory diagram of the relationship between the magnetic field and the moving speed of iron powder to the mainstream pipe (indicated by circles) Will be described with reference to FIG.

First, the structure of the powder / fluid mixing apparatus is shown in FIG.
Describing with reference to (a), the powder / fluid mixing apparatus 1 mixes iron powder 11 which is a magnetic material and water 12 which is a liquid. Reference numeral 2 shown in FIG. Is a mainstream pipe (made of vinyl chloride and having an inner diameter of 30 mm) horizontally arranged, and the mainstream pipe 2 is provided with a vertical powder supply pipe (chlorine chloride) provided at the bottom of the reservoir tank 3 and projecting downward. It is made of vinyl and has an inner diameter of 10 mm). Iron powder 11 is put in the reservoir tank 3, and the iron powder 11 is supplied to the mainstream pipe 2 via the powder supply pipe 4. On the other hand, a powder supply base pipe 8 communicates with the upper side of the reservoir tank 3 and is configured to replenish the reservoir tank 3 with iron powder 11 as needed.

On both sides of the powder feed pipe 4, that is, on the upstream side and the downstream side of the main flow pipe 2, respectively, in the vicinity of the outer sides thereof, the main flow pipe 2 and the powder feed pipe 4 are separated from each other. Superconducting magnets 5 and 6 that generate a magnetic field of 7 T (Tesla) exerting a magnetic force are arranged. These superconducting magnets 5,
6 is housed in adiabatic heat insulating cases 7 and 7, respectively, and cooled to 4 K (−269 ° C.) by liquid nitrogen and liquid helium. In the heat insulating case 7, 7, the superconducting magnets 5 and 6 are substantially surrounded by a winding frame 5 formed by winding a superconducting wire made of NbTi.
a and 6a. It should be noted that although the superconducting magnets 5 and 6 are used in the first embodiment, they can be replaced with an extremely general electromagnet.

Hereinafter, the powder / fluid mixing apparatus 1 having the above structure
Referring to FIG. 1B, the operation mode of
The superconducting magnets 5 and 6 form a mountain-shaped magnetic field having a steep positive gradient and a negative gradient on both sides of the z-axis shown by the alternate long and short dash line passing through the radial center of the powder supply tube 4, and If the magnetic field strength B of the iron powder 11 between and the electromagnetic force proportional to the magnetic field gradient dB / dz, that is, the magnetic susceptibility of the iron powder 11, is χ,
-The electromagnetic force F of B- (dB / dz) acts. Due to this electromagnetic force F, the iron powder 11 in the reservoir tank 3 is attracted to the one having the larger magnetic field strength and moves toward the mainstream pipe 2. The maximum magnetic field gradient dB / dz in this case is 25
T / m, and the product of the magnetic field strength and the magnetic field gradient B · (d
B / dz) is 135 T ² / m.

When the iron powder 11 exceeds the symmetry point P of the superconducting magnets 5 and 6, the magnetic field has a negative gradient as shown in the figure, so that the iron powder 11 is prevented from moving in the direction of the mainstream pipe 2. Although the electromagnetic force F ′ acts, the iron powder 11 continues to move toward the mainstream pipe 2 due to the total force of the inertial force Fi and the suction force of the water 12 flowing through the mainstream pipe 2. Then, while flowing into the mainstream pipe 2, it joins with the water 12 to form a slurry 13 which is fed to the next step.

Next, referring to FIG. 3, the moving speed of the iron powder 11 to the mainstream pipe 2 with respect to the magnetic field strength will be described. As the magnetic field formed by the superconducting magnets 5 and 6 increases, the iron powder 11 In the case of the present example in which the moving speed is increased and the magnetic field is 7T, 150 g / min (Fig. 3).
It is indicated by a circle inside. )Met.

In this way, by the action of the superconducting magnets 5 and 6,
Since the iron powder 11 in the reservoir tank 3 can be moved and flowed into the mainstream pipe 2, as in the conventional case, 5 × 10
There is no need to use an expensive reservoir tank 3 that can withstand a high pressure of ^{5 to} 6 × 10 ⁵ Pa, or to use a batch system in which the valve opening / closing operation is repeated. The powder 11 can be continuously replenished to the reservoir tank 3 while continuing to supply the iron powder 11 from the reservoir tank 3 to the mainstream pipe 2. Cost reduction of mixing equipment, iron powder 11 and water 12
This has the effect of improving the mixing efficiency with and reducing the maintenance cost of the powder / fluid mixing device.

In the case of the first embodiment, a slight bridging phenomenon occurs at the powder inlet 4a of the powder supply pipe 4,
In some cases, the iron powder 11 did not flow from the powder supply pipe 4 into the mainstream pipe 2. However, if the magnetic field is made stronger than 7T, the iron powder 11 in the reservoir tank 3 can be allowed to flow into the mainstream pipe 2 without causing a bridge.

Next, a powder / fluid mixing apparatus according to a second embodiment of the present invention will be described with reference to FIG.
FIG. 2B of the operation explanatory diagram thereof and FIG. 3 of the relationship explanatory diagram (indicated by square marks) between the magnetic field and the moving speed of the iron powder to the mainstream pipe described in the section of the first embodiment. It will be explained with reference to FIG. However, the difference between this embodiment and the above embodiment is that
Since there are differences in the number of superconducting magnets 5 and 6, the same components and those having the same functions as those in the first embodiment are designated by the same reference numerals, and the differences will be described.

That is, the structure of the powder / fluid mixing apparatus 1 according to the second embodiment is, as well understood from FIG. 2A, as in the first embodiment, both sides sandwiching the powder supply pipe 4 therebetween. The superconducting magnets 5 and 6 for generating a magnetic field of 7T are arranged at the respective positions near the outside of the mainstream pipe 2 and the mainstream pipe 2 in FIG. The superconducting magnets 5 and 6 are additionally disposed at the lower position of the main flow tube 2 and at a position symmetrical with respect to a center line passing through the radial center of the mainstream pipe 2.

The mode of operation of the powder / fluid mixing apparatus 1 according to the second embodiment will be described below with reference to FIG. 2 (b). A magnetic field having two peaks having a steep positive gradient and a negative gradient is formed on both sides of the z-axis indicated by the one-dot chain line passing through the radial center. Therefore, the electromagnetic force F of χ · B · (dB / dz) acts on the iron powder 11 between the superconducting magnets 5 and 6 as in the above embodiment, so that the iron powder 11 is directed toward the main flow pipe 2. It can be moved.

Incidentally, the moving speed of the iron powder 11 to the mainstream tube 2 with respect to the magnetic field strength is 7T when the magnetic field formed by the superconducting magnets 5, 5, 6, 6 is as shown by the square marks in FIG.
In this case, it was 220 g / min, which was about 1.5 times that in the case of Example 1 above.

Further, in the second embodiment, only the superconducting magnets 5 and 6 on the powder supply pipe 4 side are excited to generate a bridge phenomenon at the powder inlet 4a of the powder supply pipe 4, and then the powder supply is performed. Tube 4
When both the superconducting magnets 5 and 6 on the side and the superconducting magnets 5 and 6 on the lower side were excited together, the bridge was broken, and the iron powder 11 in the reservoir tank 3 could be flowed out to the mainstream pipe 2 without trouble. Therefore, in addition to the effects of the above-described embodiment, this embodiment has a great effect that the stable mixing operation of the iron powder 11 and the water 12 can be continued even when the maximum magnetic field is 7T.

A powder / fluid mixing apparatus according to a third embodiment of the present invention will be described with reference to FIG. 4 which is a schematic cross-sectional configuration explanatory view showing a main part thereof. Of the superconducting magnets 5 and 4 are communicated with each other, and the superconducting magnets 5 and
6, the superconducting magnets 5 and 6 are arranged.

Therefore, the superconducting magnets 5, 6 and the superconducting magnets 5, 6 cause the iron powder 11 in the reservoir tank to flow into the main flow pipe 2 via the two powder supply pipes 4, 4, respectively. Since this can be mixed with the water 12 flowing through the main flow pipe 2, this embodiment has the same effect as the above embodiment.

In the above description, the case where the powder is the iron powder 11 has been described as an example. However, the powder is not limited to the iron powder 11 because the powder may be a ferromagnetic material. Since it can be applied to the mixing of fluids having magnetism, it is not particularly limited to powder, and further, design changes and the like can be freely made without departing from the technical idea of the present invention.

[0027]

As described in detail above, the first aspect of the present invention
According to the powder / fluid mixing apparatus of the second aspect, the powder of the magnetic material in the reservoir tank is supplied to the mainstream pipe through the powder supply pipe by the action of the magnetic force of the magnet, and the powder and the fluid are mixed. Since they can be mixed, there is no need to use a reservoir tank that withstands high pressure, nor is it necessary to use a batch system in which the valve opening and closing operations are repeated, and while continuing to supply the powder from the reservoir tank to the mainstream pipe, The powder can be continuously supplied to the reservoir tank. Therefore, it is possible to reduce the price of the powder / fluid mixing device by reducing the price of the reservoir tank, improve the mixing efficiency of the powder and the fluid, and reduce the maintenance cost of the powder / fluid mixing device.

[Brief description of drawings]

FIG. 1 (a) is a schematic sectional configuration explanatory view of a powder / fluid mixing apparatus according to a first embodiment of the present invention, and FIG. 1 (b) is an operation explanatory view thereof.

FIG. 2 (a) is a schematic sectional configuration explanatory view of a powder / fluid mixing apparatus according to a second embodiment of the present invention, and FIG. 2 (b) is an operation explanatory view thereof.

FIG. 3 is an explanatory diagram of a relationship between a magnetic field and a moving speed of iron powder to a mainstream pipe.

FIG. 4 is a schematic sectional configuration explanatory view showing a main part of a powder / fluid mixing apparatus according to a third embodiment of the present invention.

FIG. 5 is a schematic sectional configuration explanatory diagram of a powder / fluid mixing device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Powder / fluid mixing device 2 ... Main flow pipe 3 ... Reservoir tank 4 ... Powder supply pipe, 4a ... Powder inlet 5 ... Superconducting magnet, 5a ... Reel 6 ... Superconducting magnet, 6a ... Reel 7 ... Adiabatic heat insulation case 8 ... Powder supply base pipe 11 ... Iron powder 12 ... Water 13 ... Slurry

Claims (2)

[Claims] 1. A powder / fluid mixing apparatus for mixing a fluid and a powder, wherein a powder supply pipe for supplying powder of a magnetic material from a reservoir tank is connected to a main flow pipe through which a fluid flows. A magnet for exerting a magnetic force on the mainstream pipe and the powder supply pipe is provided at each of positions on the upstream side and the downstream side of the mainstream pipe sandwiching the powder supply pipe, at positions near the outside of the mainstream pipe. Powder / fluid mixing device characterized by 2. The powder / fluid mixing apparatus according to claim 1, wherein the magnet is a superconducting magnet.