KR101461787B1 - Heating unit and reduction furnace having thereof - Google Patents

Abstract

The heating unit according to an embodiment of the present invention generates heat by means of body means provided with an object to be reduced, microwave application means applying microwave to the body means, and microwave of the microwave application means, And may include provided filler heating means.
According to another aspect of the present invention, there is provided a reduction furnace comprising: a vacuum chamber connected to the outside of the body to vacuum form the inside of the heating unit and the body provided with the reduction object; And a condenser connected to the upper end of the body means for condensing water vapor, wherein the condensate can be one of magnesium (Mg), aluminum (Al) and iron (Fe).

Description

TECHNICAL FIELD [0001] The present invention relates to a heating unit and a reducing furnace including the heating unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating unit and a reducing furnace including the heating unit, and more particularly, to a heating unit and a reducing furnace that radiate heat when a microwave is applied across a body means provided with a reduction object.

The reducing furnace used in the general magnesium reduction process was made by casting a cylindrical long heat-resistant steel material and installing it horizontally in a reduction facility (R). In recent years, the reduction furnace has been vertically arranged in order to increase the productivity, and is heated to about 1200 ° C using a gas burner from the outside.

Generally, when the magnesium smelting reduction furnace is installed horizontally in a reduction facility where heat reduction is performed, this is called a pidgion process. In the Pigeon process, the general reduction furnace has an inner diameter of about 300 mm, a length of about 3 m, and the material is a Cr-Ni heat-resistant steel, which is mostly manufactured by centrifugal casting.

As the temperature of the reducing furnace increases, the recovery rate of magnesium in the magnesium ore increases, but the temperature of the reducing furnace is maintained at about 1150 to 1250 ° C due to the limit of the heat-resistant temperature of the reducing furnace.

In a typical magnesium thermal reduction process, the heat required for the reaction is supplied by the reaction of the air (air: A) and the fuel (feul: F) such as coal, coal gas or natural gas in the reduction facility, It is transferred to the internal monochromatic mixed material.

In the reduction furnace, the heat transferred by the single light made of the mixture of the calcined dolomite and the reducing agent, ferrosilicon, is transferred by radiation and conduction. Since the thermal conductivity of the ore is low, all the contents in the reduction furnace reach the required reaction temperature And it usually takes about 12 ~ 15 hours for one operation including preparation time for normal operation.

That is, since the raw material ore in the reducing furnace is heated by a heating mechanism such as a burner outside the reducing furnace provided in the reducing facility, the raw material in the reducing furnace is heated by the conduction between the adjacent raw materials in contact with each other, The reaction is completed by heating to the center by radiative heat transfer. Accordingly, since the heat is transferred to the center of the reducing furnace and the reaction takes more than 12 hours to complete, the production speed is very slow in the case of heating from the outside.

Further, as the diameter of the reduction furnace is larger, the reaction completion time is increased and productivity is lowered, so that the size of the reduction furnace is usually limited to within 300 mm.

Recently, a technique for a vertical type reduction reactor having a relatively large diameter as compared with a conventional horizontal type reduction reactor has been developed, but the diameter of the reduction furnace is also limited.

Therefore, it is necessary to study a heating unit and a reducing equipment including the heating unit to solve the above-mentioned problems.

An object of the present invention is to provide a heating unit capable of increasing productivity by generating heat in a reducing furnace by using a microwave and improving a production speed and a reducing furnace including the heating unit.

The heating unit according to an embodiment of the present invention generates heat by means of body means provided with an object to be reduced, microwave application means applying microwave to the body means, and microwave of the microwave application means, And may include provided filler heating means.

Further, the filler heat generating means of the heating unit according to an embodiment of the present invention may be provided in a columnar shape or a plate shape.

The filler heating means of the heating unit according to an embodiment of the present invention also includes at least one of a longitudinal pillar provided across the longitudinal direction of the body means and a transverse pillar provided transversely across the body means can do.

The microwave applying means of the heating unit according to an embodiment of the present invention includes a magnetron for generating a microwave and a microwave generated from the magnetron to the heating means, and a plurality of waveguides provided in the circumferential direction of the body means .

Further, the heating unit according to an embodiment of the present invention may further include external heating means provided outside the body means.

According to another aspect of the present invention, there is provided a reduction furnace comprising: a vacuum chamber connected to the outside of the body to vacuum form the inside of the heating unit and the body provided with the reduction object; And a condenser connected to the upper end of the body means for condensing water vapor, wherein the condensate can be one of magnesium (Mg), aluminum (Al) and iron (Fe).

The body means of the reducing furnace according to another embodiment of the present invention includes an outer tube connected to the vacuum chamber and an inner tube provided inside the outer tube for transmitting the reduced vapor vapor to the condenser at the upper end, The object to be reduced may be provided between the above-described through-hole outer cylinder.

The heating unit and the reducing furnace including the heating unit of the present invention have the effect of heating the inside of the body means provided with the reduction object by providing the pillow heating means which is heated by the microwave.

Further, since the filler heat generating means is provided across the inside of the body means, there is an advantage that the reduction object can be heated evenly.

Thereby, the object to be reduced can be heated in a short period of time, and the production speed of the reduced material in which the object to be reduced is reduced is improved, so that the productivity can be increased.

Further, the reduction time can be greatly shortened, the lifetime of the heating unit or the reducing furnace can be improved, and the advantage of reducing the production process stoppage time due to frequent component replacement can be expected.

Figure 1 shows a conventional reduction facility.
2 is a front view showing a reducing furnace including the heating unit of the present invention.
3 is a cross-sectional view in the width direction of the body means in which the longitudinal pillar of the present invention is provided.
4 is a longitudinal cross-sectional view of the body means provided with the transverse pillar of the present invention.
5 is a front view showing an embodiment in which the heating unit of the present invention includes external heating means.
6 is a plan view showing the reducing furnace including the heating unit of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The heating unit 100 of the present invention and the reducing furnace 1 including the heating unit 100 can be manufactured by providing the filler heating means 130 that generates heat when the microwave is applied across the inside of the body means 110 provided with the reduction object 2a , It is possible to heat the inside of the body means 110 provided with the reduction object 2a.

Since the filler heating means 130 is provided across the inside of the body means 110, the object to be reduced 2a can be uniformly heated and the object to be reduced 2a can be heated quickly do.

2 is a front view showing the reducing furnace 1 including the heating unit 100 of the present invention. FIG. 3 is a cross-sectional view of the heating unit 100 according to the present invention, X).

2 and 3, a heating unit 100 according to an embodiment of the present invention includes a body 110 provided with a reduction object 2a, a microwave application unit 120 for applying microwave to the body 110, And a filler heating unit 130 that generates heat by means of the microwave of the microwave applying unit 120 and is provided across the inside of the body unit 110.

In addition, the filler heat generating means 130 of the heating unit 100 according to an embodiment of the present invention may be provided in a cylindrical shape or a plate shape.

The body means 110 is provided with a reduction object 2a and serves to provide a space in which the reduction object 2a is reduced by heat generated by the filler heat generating means 130 which will be described later. For this purpose, the body means 110 may provide an inner tube 111 and an outer tube 112.

The reduction object 2a is provided between the inner cylinder 111 and the outer cylinder 112 and the filler heat generating means 130 may be provided. That is, the filler heat generating means 130 may be provided inside the body means 110, and the heating of the object to be reduced 2a may be performed from the inside of the body means 110. As a result, the heating rate for the entire reduction target 2a can be improved.

On the other hand, the outside of the outer cylinder 112 may be provided with a vacuum 210 of the vacuum forming means described later. The inner cylinder 111 is connected to the condensing part 220 of the vacuum forming means to be described later and is connected to the condensing part 220 through the passage of the steam of the reduced material 2b, Can play a role.

The microwave applying unit 120 may generate a microwave and transmit the microwave to the filler heating unit 130, which will be described later. For this, the microwave applying unit 120 may include a magnetron 121 and a waveguide 122.

The magnetron 121 may generate microwaves. In other words, the magnetron 121 of the present invention can be used as long as it can generate microwaves. The magnetron 121 may be connected to a power controller to control the intensity of the generated microwave, and may be provided with a monitor for measuring the size of the microwave.

The waveguide 122 may transmit microwaves generated from the magnetron 121 to the filler heating unit 130. The waveguide 122 may be connected to the body 110 provided with the magnetron 121 and the pillar heating unit 130.

The waveguide 122 may have a predetermined strength and may be made of a stainless steel alloy or an aluminum alloy to prevent microwaves from leaking.

When the magnetron 121 is used at a frequency of 2.45 GHz, the waveguide 122 preferably has a cross-sectional area of 105 to 115 mm on one side and a rectangular area of 0 to 60 mm on the other side, It is preferable to provide an area of a rectangle having a side length of 109.22 mm and a side length of 4.61 mm. As a result, the microwave transfer effect can be optimally presented.

Meanwhile, the waveguide 122 may be provided with a filter 122a for maintaining a vacuum environment when the interior of the body 110 is provided with a vacuum.

That is, the filter 122a is provided so as to allow only microwaves to pass therethrough, so that the interior of the body 110 can be maintained in a vacuum state. As an example of the filter 122a, there may be a quartz.

The microwave applying unit 120 may further include an isolator 123. The isolator 123 dissipates and processes unnecessary electromagnetic waves that may be generated in the magnetron 121 when the microwave is generated .

The filler heating means 130 may receive the microwave provided from the microwave applying means 120 to generate heat. That is, the filler heat generating means 130 can be provided as a material that generates heat when the microwave is absorbed.

For example, the material of the filler heat generating unit 130 may be silicon carbide (SIC). The silicon carbide is a heating element which is self-heating when a microwave is applied, and is known as an optimal self-heating element when microwave is applied.

Since such a silicon carbide has a density of about 3.22 g / cm 3 and is an artificial mineral produced by covalent bonding, it can be molded into a desired shape, has a high hardness, and is excellent in abrasion resistance and hardness .

As another material of the filler heating means 130, zirconia, that is, zirconium oxide (ZrO ₂ ) may be used. The zirconia also has a characteristic of generating heat when microwave is applied, and thus can be used as a material of the filler heating means 130.

The filler heating unit 130 may be formed of a material that generates heat when the microwave is applied and is provided inside the body unit 110 provided with the reduction object 2a, The body 110 can be heated from the inside thereof.

For this purpose, the filler heat generating means 130 may be provided in a columnar shape or in a plate shape. That is, the filler heat generating means 130 is provided in the form of a cylinder or a plate at uniform intervals on the inner side of the body means 110 provided with the reduction object 2a to uniformly heat the entire reduction object 2a It can be done.

In other words, the filler heating means 130 is provided across the body 110 in the longitudinal direction (Y) to the width direction (X), thereby heating the reduction object (2a) So that it can be heated evenly.

Here, the columnar filler heat generating means 130 is shown in FIG. 3 (a), and the plate-shaped filler heat generating means 130 is shown in FIG. 3 (b).

The filler heat generating means 130 may be provided at the upper end or the lower end of the body 110 in the case of the longitudinal pillars 131 provided in the longitudinal direction Y of the body means 110, May be provided at the portion where the reduction object 2a is provided between the outer cylinder 111 and the outer cylinder 112 as well as the inner cylinder 111. [

In other words, conventionally, the heating burner can only heat the outer side of the body means 110, so that the heating balance is generated in which the outer side is overheated and the inner side is insufficient in heating amount. ), It is not possible to sufficiently heat the inner side, resulting in a problem that the production amount is limited.

However, since the heating unit 100 of the present invention provides the filler heat generating means 130 to the inside of the body means 110, the uniformity of the outside and inside of the reduction object 2a can be reduced, It is possible to increase the production amount within the heat resistance limit of the heat exchanger 110.

The filler heat generating means 130 may include not only the longitudinal pillars 131 provided in the longitudinal direction Y of the body means 110 but also the longitudinal pillars 131 provided in the width direction X of the body means 110, (Not shown). A detailed description thereof will be described later with reference to Fig.

Meanwhile, the heating unit 100 of the present invention may further include an external heating unit 140, which will be described later in detail with reference to FIG.

FIG. 4 is a longitudinal (Y) cross-sectional view of a body 110 provided with a transverse pillar 132 of the present invention. Referring to FIG. 4, the pillow heating unit 100 of the heating unit 100 130 may be formed of at least one of a longitudinal pillar 131 provided transversely in the longitudinal direction Y of the body means 110 and a transverse pillar 132 provided transversely in the width direction X of the body means 110 One can be included.

The transverse pillar 132 may be provided in the width direction X of the body 110 and may be provided at a predetermined interval in the circumferential direction of the body 110, 110 may be provided at a predetermined interval in the longitudinal direction Y of each of the first and second plates 110,

As described above, the reduction object (2a) can be uniformly heated by the transverse pillar (132) to improve the production speed of the reduced material (2b).

5 is a front view showing an embodiment in which the heating unit 100 of the present invention includes the external heating means 140. Referring to this, the heating unit 100 according to an embodiment of the present invention includes the body 110 And an external heating means 140 provided on the outside of the heating means.

That is, the filler heating means 130 and the external heating means 140 can be provided at the same time. According to this, the reduction target 2a can be heated more quickly, and the production speed can be improved.

In other words, the filler heating means 130 heats the reduction object 2a from the inside, the external heating means 140 heats the reduction object 2a from the outside, and the reduction object 2a It is possible to rapidly heat to the target temperature, thereby improving the production speed of the reduced product 2b.

The external heating means 140 may be provided as a heating burner for burning coal, coal gas, natural gas or the like, which has been used in the existing reduction furnace 1, as a raw material, or may be provided as a heating coil which is heated by electricity.

6 is a plan view showing a reducing furnace 1 including a heating unit 100 according to the present invention. Referring to FIG. 6, the microwave applying unit 120 of the heating unit 100 according to an embodiment of the present invention includes a microwave And a plurality of waveguides 122 are provided in the circumferential direction of the body 110 to transmit the microwaves generated from the magnetron 121 to the filler heating means 130. [ have.

That is, the microwave applying unit 120 provides the magnetron 121 and the waveguide 122 as well as a plurality of the waveguide 122 in the circumferential direction of the body 110, So that the application of the microwave to the means 130 can be performed rapidly and rapidly.

In other words, since the waveguide 122 is provided in the circumferential direction of the body means 110 at regular intervals, it is possible to uniformly provide the microwave to the filler heating means 130 dispersed evenly in the body means 110 will be. In this way, the effect of evenly and rapidly heating the reduction object 2a can be further enhanced.

The reducing furnace 1 according to another embodiment of the present invention may further include a body unit 110 for vacuum forming the inside of the body unit 110 provided with the heating unit 100 and the object to be reduced 2a, (220) connected to the upper end of the body means (110) so as to aggregate the vapor of the reduced material (2b) to which the reduction object (2b) is reduced, and a condenser The reduced product 2b of the reducing furnace 1 according to another embodiment of the present invention may be one of magnesium (Mg), aluminum (Al), and iron (Fe).

The body 110 of the reducing furnace 1 according to another embodiment of the present invention is provided inside the outer cylinder 112 connected to the vacuum chamber 210 and the outer cylinder 112, And an inner cylinder 111 for transferring the steam to the condenser 220 at the upper end of the outer cylinder 112. The reduction object 2a may be provided between the inner cylinder 111 and the outer cylinder 112. [

The vacuum forming unit 200 may be provided in the body 110 so as to improve the recovery rate of the reduced material 2b reduced by the object to be reduced 2a. For this purpose, the vacuum forming unit 200 may include a vacuum 210 and a condenser 220.

The vacuum chamber 210 may be provided outside the outer cylinder 112 to form a vacuum environment inside the body 110. For this purpose, the vacuum chamber 210 may include a suction port And a pump 210a. That is, when the valve connected to the suction path 210b is opened, the pump 210a can operate to form the vacuum inside.

The condenser 220 may be connected to the inner cylinder 111 to condense and discharge the evaporated reduction water 2b. That is, the condenser 220 can be connected to the upper end of the body unit 110 to easily collect the evaporated reduced material 2b, and the reduced material 2b Is moved to the portion where the cooling nozzle 220a is provided when the valve is opened, so that it can be cooled and condensed.

The reduced material 2b produced by reduction of the reduction target 2a may be magnesium (Mg), aluminum (Al), iron (Fe), or the like. The reduced material 2b may be heated Temperature can be adjusted.

Particularly, in the case of producing magnesium, a reduction object 2a made of a mixture of calcined dolomite and ferro-silicon is charged in the body means 110. Thereafter, the inside of the body 110 is vacuum-reduced, and when the temperature is maintained at about 1160 to 1220 ° C, the silicon component of the 72-75% ferrosilicon alloy contained in the molded body acts as a reducing agent, Reduction proceeds by reduction. The reduced magnesium vapor is condensed in the condenser 220 so that magnesium can be recovered.

1: Reduction furnace 100: Heating unit
110: body means 111: inner tube
112: outer tube 120: microwave applying means
121: Magnetron 122: Waveguide
123: Isolator 130: Filler heating means
131: longitudinal pillar 132: lateral pillar
140: external heating means 200: vacuum forming unit
210: evacuation 220: condenser

Claims (7)

A body means for providing a reduction object;
A microwave applying means for applying a microwave to the body means; And
A filler heating means which generates heat by microwaves of the microwave applying means and is provided to contact the reduction object across the inside of the body means;
/ RTI > A body means for providing a reduction object;
A microwave applying means for applying a microwave to the body means; And
A filler heat generating unit that generates heat by microwaves of the microwave applying unit and is provided across the inside of the body unit;
/ RTI >
Wherein the filler heat generating means is provided in a columnar or plate shape. A body means for providing a reduction object;
A microwave applying means for applying a microwave to the body means; And
A filler heat generating unit that generates heat by microwaves of the microwave applying unit and is provided across the inside of the body unit;
/ RTI >
The filler-
A longitudinal pillar provided across the length of the body means; And
A transverse pillar provided across the width direction of the body means;
≪ / RTI > A body means for providing a reduction object;
A microwave applying means for applying a microwave to the body means; And
A filler heat generating unit that generates heat by microwaves of the microwave applying unit and is provided across the inside of the body unit;
/ RTI >
The microwave applying means includes:
A magnetron generating microwaves; And
A waveguide for transmitting a microwave generated from the magnetron to the pillar heating means and provided in a plurality of circumferential directions of the body means;
/ RTI > The method according to claim 1,
External heating means provided outside the body means;
Further comprising: The heating unit according to any one of claims 1 to 5; And
And a condenser connected to the upper end of the body means for condensing the reduced reductant vapor, and a condenser connected to an upper end of the body means for condensing the reduced reductant vapor, Forming unit;
/ RTI >
Wherein the reduced product is one of magnesium (Mg), aluminum (Al), and iron (Fe). The method according to claim 6,
Wherein the body means comprises:
An outer tube connected to the vacuum chamber; And
An inner cylinder provided inside the outer cylinder for transmitting the reduced-water vapor to the condenser at the upper end;
/ RTI >
Wherein the object to be reduced is provided between the inner passage and the outer passage.

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