KR101524637B1 - Heat composition irradiated by microwave, uniformly-heated device by microwave comprising the same and construction method of the device - Google Patents

Abstract

[0001] The present invention relates to a heating element composition that generates heat by microwaves and a heating device using the same, and more particularly, to a heating element which is excellent in heat generation efficiency and has excellent heat transfer efficiency for transferring generated heat to the surroundings, The present invention provides a heating device capable of further increasing the uniform heating effect by specifically designing the heating device as well as the heating element composition design in order to maximize the uniform heating effect.
According to the present invention, by using a material having a high heat generating efficiency and a material having an excellent energy transmitting efficiency at an optimum ratio, a high heat generating efficiency can be achieved in a short time, and heat generated through the heat can be quickly transmitted to the surrounding area. Further, in order to prevent the microwave from being irradiated only locally, the internal structure of the heating device can be designed so that the microwave can be efficiently distributed as a whole, so that the uniform heating effect can be further increased in addition to the material design. Therefore, it is possible to solve the problem of cracking due to local overheating and the problem of unevenness of physical properties such as compressive strength, and thus the possibility of application to heating objects can be remarkably improved.

Description

Technical Field [0001] The present invention relates to a heating element composition that generates heat by microwaves, a uniform heating device that generates heat by microwaves including the same, and a method of constructing the same.

The present invention relates to a heating element composition that generates heat by microwaves, a uniform heating device that generates heat by microwaves containing the same, and a method of manufacturing the same. More particularly, And a method of manufacturing the same. [0002] The present invention relates to a heating element composition for heating a microwave,

In general, metal oxides such as iron oxides are known to generate heat by absorbing microwaves. There have been attempts to utilize these properties in microwave ovens (Japanese Patent Application 2001-397441, 2002-18973, etc.) (Japanese Patent Application No. 2004-89191, etc.) have been carried out in order to improve the characteristics such as the research for obtaining a heat-generating material having enhanced heat resistance and weather resistance.

The inventors of the present invention have proposed a technology that can reduce environmental pollution and can be used as a high-value-added material by using a by-product produced at an industrial site by a special screening operation and using it as a material to be heated by microwaves. (Korean Patent Application No. 10-2011-32313, 10-2011-59011, 10-2011-58947) The present inventors have found that by manufacturing a heating element that can be heated by a microwave using materials discarded at industrial sites through the above patent, A technique capable of obtaining a high-efficiency heating effect without using expensive materials (carbon, graphite, etc.) has been proposed, and a special heating device using such a material has been proposed.

However, in the technology proposed by the present inventors, it has been found that the exothermic efficiency is very good, but the heat transfer efficiency to transfer it to the surroundings is not good, so that the exothermic efficiency is good only locally and the exothermic efficiency is poor overall. As a result, the heat is locally overheated and the heat transfer is not efficiently performed around the crack, and cracks are generated in the heating object due to non-uniform heating, and imbalances in physical properties such as compressive strength are found. It was a big situation.

The present invention has been developed in order to solve the problems found in the prior art as described above. The first problem to be solved by the present invention is to provide a method of manufacturing a semiconductor device, which is excellent in heat generation efficiency, Another object of the present invention is to provide a heating element composition which is capable of uniformly generating heat as a whole.

The second problem to be solved by the present invention is to provide a heating device capable of further increasing the uniform heat generation effect by specially designing the heating device as well as designing the heating element composition to more effectively perform uniform heating.

A third problem to be solved by the present invention is to provide a method of constructing the heating device.

In order to achieve the first object,

Wherein the ceramic composition comprises a rapid-cooling steelmaking slag having a particle size of 5.0 mm or less, a sphericity of 0.5 or more, and silicon carbide particles having a particle size of 5.0 mm or less in a weight ratio of 100: 0.1 to 100 .

In order to achieve the second object,

A microwave generator for generating microwaves;

A waveguide connected at one end to the microwave generator and having a pipe shape for receiving a microwave generated from the microwave generator and transmitting the received microwave to the reflector;

A reflector having a sealed inner space for diffusing the microwave transmitted from the waveguide and sharing the inner space with the waveguide;

A distribution plate provided on the opposite side with respect to the waveguide and the sealed inner space and having a distribution hole for passing a microwave that is irregularly reflected by the reflection portion;

A heating element which is provided on the opposite side of the reflection part and is in close contact with the distribution plate and absorbs microwaves passing through the distribution hole to generate heat; And

And a cavity cover which is connected to the upper ends of the side plates and forms a closed reflective part together with the side plates, And a cavity for transmitting heat generated from the heating element to the outside

And,

Wherein the heating element is a ceramic composition comprising a rapid cooling steel making slag having a particle size of 5.0 mm or less and a sphericity of 0.5 or more and silicon carbide particles having a particle size of 5.0 mm or less at a ratio of 100: 0.1 to 100 by weight. Lt; / RTI >

In order to achieve the third object,

Attaching or embedding a heating device, which is heated by a microwave according to the present invention, on a surface of a target object; And

Connecting an electrode to a heating device that generates heat by the microwave;

The present invention provides a method of manufacturing a heating device that generates heat by a microwave.

The characteristics and advantages of the heating element composition that is generated by the microwave according to the present invention, the uniform heating device that generates heat by the microwave and the construction method thereof will be described as follows.

1. By using a heat generating material generated by a microwave in combination with a material having a high heat generating efficiency, that is, a material having an excellent energy efficiency and a material having an excellent energy transfer efficiency, that is, a material having an excellent energy release rate at an optimum ratio, It is possible to transmit the heat generated by the heat source to the surroundings quickly, so that the uniformity of heat generation is remarkably improved as compared with the conventional materials.

2. In addition, since the internal structure of the heating device is designed so that the microwave can be efficiently distributed as a whole in order to prevent the microwave from being irradiated only locally, the uniform heating effect can be further increased in addition to the material design.

3. It can solve the problem of cracks due to local overheating and the problem of unevenness of physical properties such as compressive strength, and it is possible to remarkably improve the applicability to heating objects.

FIG. 1 shows the outer shape of a heating element composition that is heated by a microwave according to an embodiment of the present invention.
Figure 2 is a graph of the internal energy and emission energy results of MIP, SiC, and mixtures thereof in accordance with one embodiment of the present invention.
3 is a plan view of a heating device that generates heat by a microwave according to an embodiment of the present invention.
4 is a side cross-sectional view of a heating device that generates heat by a microwave according to an embodiment of the present invention.
FIG. 5 shows several examples of distribution plates applied to a heating device that generates heat by a microwave according to an embodiment of the present invention.
FIG. 6 shows an example of curing a base concrete such as a column or a bridge using a heating device that generates heat by a microwave according to an embodiment of the present invention.
FIG. 7 illustrates an example of curing a flat concrete such as a wall or a slab using a heating device that generates heat by a microwave according to an embodiment of the present invention.
FIG. 8 shows an example in which the present invention is applied to snow melting and melting of roads, sewer pipes, and the like using a heating device that generates heat by microwaves according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

FIG. 1 shows the outer shape of a heating element composition that is heated by a microwave according to an embodiment of the present invention. As shown in FIG. 1, a heating element composition that generates heat by microwaves according to the present invention comprises a rapid cooling steel making slag having a particle size of 5.0 mm or less, a sphericity of 0.5 or more, and silicon carbide particles having a particle size of 5.0 mm or less at a ratio of 100: 0.1 to 100 It is preferable that the ceramic composition is a ceramic composition. In the present invention, the particle size of the rapid-cooling steelmaking slag is more preferably 3.0 mm or less, and still more preferably 1.0 mm or less. In addition, in the present invention, the silicon carbide particles preferably have a particle size of 3.0 mm or less, more preferably 1.0 mm or less. The mixing weight ratio of the rapid-cooling steelmaking slag and the diatomaceous carbonaceous material is preferably 100: 0.1 to 50, more preferably 100: 0.5 to 20. The heating element composition may be used as the ceramic composition itself. However, it is preferable that 100 parts by weight of the ceramic composition is mixed with cement at a weight ratio of 0.1 to 50, and a suitable amount of water is added thereto. ) Is more preferably used. In this case, since the content of the ceramic composition is high and a small amount of cement is contained, it shows a dark gray or light black color from the outside. Fig. 1 shows the outer shape of the cured product. The cured product is used as it is in the shape of Fig. 1, and the surface of the cured product may be used in a flat state.

In the present invention, the meaning of 'ideal' means that the value is higher than the corresponding value and generally has an upper limit value that can be reasonably understood in the field to which the present technology belongs, and the meaning of 'below' Means that the invention has a lower limit of common sense and reasonably understandable in the field to which the present invention belongs, it should be understood as an expression for expressing the invention in a simple and clear manner.

Conventionally, the slag discharged from a steel mill is treated by discharging the slag into a slag pot disposed in a lower portion of a converter or an electric furnace and then discharging the slag to a treatment plant. In the conventional treatment method, a large amount of water is sprayed on the discharged slag to cool the slag The iron content in the slag after solidification and subsequent crushing process is selected through a magnetic separator to be used as a steel source, and the remaining slag is mostly used as an aggregate such as landfill or road pavement because it has no special purpose. However, when the waste slag is simply buried in the landfill, the cost of the landfill is inconvenient and the burden of the landfill is considerably burdensome if the amount of the landfill is large. Therefore, there is an environmental problem, .

The steel slag cooled by the cooling (slow cooling) is called a slow cooling steel slag and contains a large amount of free limite (free CaO) ₂ ). Since the calcium hydroxide formed is bulky and prone to be differentiated from free lime, when used as a roadbed material, there is a problem that the road is flooded and the differentiated calcium hydroxide causes pollution of air and water quality. In addition, because calcium hydroxide is alkaline, it causes soil contamination and its use as road pavement aggregate is also very limited.

Rapid cooling steel slag was introduced to solve the problem of the slow cooling steel slag. Rapid cooling steel slag can be produced by a method of dropping a hot molten slag and spraying a high speed air stream to shake a hot molten slag to rapidly cool it by a high speed air stream and to make it into a fine powder form. When this method is used, slag in the form of fine powder is produced instead of bulk slag, so there is no need of separate crushing process and the effect of reducing the amount of free limes. However, since conventional quench steelmaking slag has focused on reducing the amount of free limes and using it as a construction aggregate, the development of new capacity has been sluggish.

The present invention has developed a new application of such a rapid steelmaking slag, and the rapid cooling steel slag absorbs microwaves and finds a property of generating heat, and uses this as a heat generating material.

The rapid-cooling steelmaking slag used in the present invention is not produced by using conventional quenching steelmaking slag which is conventionally used but is manufactured in a refined form by using a special sorting and refining method.

Hereinafter, such a selection / purification method will be described in more detail.

First, an example of a method of manufacturing the rapid cooling steelmaking slag according to the present invention is as follows. That is, the rapid cooling steelmaking slag having a particle diameter of 5.0 mm or less is selected through a sieving process in a first step, and a magnetic separator having a magnetic force of 500 gauss or more, preferably 700 to 5,000 gauss is used as a second step Only the particles having the microwave absorption efficiency required in the present invention are selected, and only spherical particles having a spherical modulus of 0.5 or more are selected through a spherical separator. At this time, the above-described seeding process, spherical sorting process, and magnetic force selecting process may be performed in sequence or simultaneously, all of which are included in the scope of the present invention. In the present invention, the rapid-cooling steelmaking slag obtained through such a special sorting and refining operation is simply referred to as " MIP (Microwave-irradiated pyrogen) ".

In the present invention, the particle size of the quench-hardened steelmaking slag is preferably 5.0 mm or less and the spherical ratio is required to be 0.5 or more. If the particle size exceeds 5.0 mm, if the particle size is excessively large, the total cross-sectional area is not large, and heat efficiency and heat transfer efficiency are deteriorated. The sphericity ratio is, in other words, the shape factor, which means the ratio of the smallest diameter to the longest side diameter of the particles. If the sphericity of the rapid cooling steel slag having a sphericity ratio of less than 0.5 results in a distorted shape, In this case, the spark may occur. Since the energy is concentrated only at the pointed portion or the angled portion and energy loss occurs, the efficiency of heat generation in the whole particle is lowered. Therefore, the sphericity should be selected to be 0.5 or more do. This rapid steelmaking slag has the characteristics of a semi-insulator between the conductor and the non-conductor, so that absorption heating and induction heating are performed, and the internal microwave is transferred according to the charging state. That is, when the microwave is applied to the continuous spherical rapid cooling steel making slag, the microwave is transferred along the rapid cooling steel slag due to the surface effect, and absorption heating and induction heating are performed in the adjacent rapid cooling steel slag as before.

The present inventors have proposed a technique of utilizing a rapid-cooling steelmaking slag composition as a heating element to be generated by microwave through the above-mentioned patent (Korean Patent Application No. 10-2011-0032313).

However, the rapid-cooling steelmaking slag composition described in the above patent has a very high energy generated by the specific heat and the microwave, but it is not so fast in terms of the transfer speed for transferring it to the periphery, i.e., the energy release rate, And it is found that there is a problem that it takes a lot of time and the local fever progresses. As a result of repeated research efforts to overcome these problems, it has been found that a combination of quenching steel slag and silicon carbide (SiC) can be solved. That is, in the case of silicon carbide, which has been known as a material capable of being heated by microwaves, the energy generated by the specific heat and microwave is lower than that of the rapid-cooling steel slag as shown in Table 1 below, The rate of transfer is much higher than that of rapid cooling steelmaking slag. Accordingly, the present inventors have found that when mixed with silicon carbide having a high energy transfer rate, problems of low energy transfer and uneven heat generation, which were problems in using the conventional quenching steel slag alone, can be solved.

Table 2 shows the results of measurement of heat efficiency by microwave using silicon carbide, MIP and water. Using Equation 1, the thermal energy used to raise the temperature is expressed as the used power, and the energy efficiency is calculated based on the ratio of the used power according to the input power using Equation 2.

As shown in the above Table 2, it can be seen that the efficiency of heat generated by the microwave for the same input power is more than twice that of the hydrocarbon.

The internal energy and the emission energy of the MIP, SiC and mixture obtained through the above experiment are shown in FIG. As shown in FIG. 2, the MIP heating element has a high energy generation rate but a low transfer rate. On the contrary, the SiC generates a relatively small amount of energy but transmits the energy at a high rate. Both effects can be achieved. (This experiment was conducted by Korea Polymer Research Institute, Korea). Specific heat analysis was performed using Perkin-Elmer DSC 4000 by KS M 3049 method. Thermal conductivity was measured by Mathis TC -30. In the case of the mixture of the present invention, MIP: SiC was mixed in a weight ratio of 100: 0.5.

As can be seen from the experimental results shown in FIG. 2, in the case of MIP alone, the internal energy increases by microwave irradiation, but the emission energy is low. In the case of SiC alone, the internal energy raised by microwave irradiation is not only the MIP, Very high.

Therefore, when the MIP and SiC are mixed with each other using such characteristics, the internal energy is relatively high and the energy release property is maintained high. Therefore, it is possible to solve the problems in using the existing MIP by itself.

In the present invention, such MIP, that is, a rapid cooling steel making slag having a particle size of 5.0 mm or less and a sphericity of 0.5 or more is mixed with silicon carbide particles having a particle size of 5.0 mm or less at an optimum ratio. Since silicon carbide is about 30 to 50 times higher in price than MIP in terms of unit cost, it is not economically advantageous if it is used in a large amount. Therefore, it is necessary to use silicon carbide in an optimum ratio. In the present invention, SiC used for MIP is 100: And more preferably 100: 0.1 to 50 parts by weight. When the SiC is used in an amount of less than 0.1 part by weight based on 100 parts by weight of MIP, the energy transfer efficiency is lowered, so that it is difficult to solve the problem of using the existing MIP alone. If the SiC is used in an excess amount exceeding 100 parts by weight, It is not preferable because the unit price may be too high and the economic effect may deteriorate.

In the present invention, the ceramic composition containing the rapid-cooling steel making slag having a particle size of 5.0 mm or less and the sphericity of 0.5 or more and the silicon carbide particles having an average particle size of 5.0 mm or less may be used as it is, And used in a cured form. The reason for using such a cured form is that when the uncured particle (particle) form is used, the handling property is not good and there is a fear that the cement is caught in one side. In the case of cured cement, the latent heat is retained for a long time This is because there is also an effect. In the present invention, the cement mixed with the ceramic composition, for example, Portland cement, is preferably mixed with 100 parts by weight of the ceramic composition in a weight ratio of 0.1 to 50, and the mixture is hydrated by adding an appropriate amount of water, Whereby a cured product is obtained. In this case, the thickness of the cured product may vary depending on the application, and it is preferably 1 to 100 mm for general use.

In the present invention, the ceramic composition may further include a metal oxide, which is conventionally known to absorb microwaves. The content of the metal oxide is preferably in the range of 0.1 to 100 parts by weight, more preferably 0.5 to 50 parts by weight to be. The size of the ceramic composition is preferably 5.0 mm or less, more preferably 3.0 mm or less, and still more preferably 1.0 mm or less. Examples of such metal oxides are iron oxides, and specific examples thereof include Fe ₂ O ₃ , Fe ₃ O ₄ and FeO. Examples of other metal oxides include Al ₂ O ₃ , CaO, SiO ₂ , TiO ₂ , MgO, and the like.

In the present invention, a heating device is manufactured using the heating element composition which is generated by the microwave.

FIG. 3 is a plan view of a heating device 20 that generates heat by a microwave according to an embodiment of the present invention, and FIG. 4 is a side sectional view thereof.

3 and 4, the heating device 20, which generates heat by the microwave according to the present invention,

A microwave generator 21 for generating a microwave;

A waveguide 22 connected at one end to the microwave generator 21 and having a pipe shape for receiving microwave generated from the microwave generator and transmitting the received microwave to the reflector;

A reflector 24 having a sealed inner space 23 for diffusing the microwave transmitted from the waveguide and sharing the inner space with the waveguide;

A distribution plate (25) provided on the opposite side of the waveguide and the sealed inner space and having a distribution hole (26) for passing a microwave that is irregularly reflected by the reflection portion;

A heating element (27) provided on the opposite side of the reflection part to closely contact the distribution plate and absorbing microwaves passing through the distribution hole to generate heat; And

A bottom plate (28-1) provided outside the heating element in close contact with a heating element, a side plate (28-2) connected to both side ends integrally with the bottom plate, and an upper And a cavity cover (28-3) forming a closed reflective part (24), and a cavity (28) for transferring heat generated from the heating element to the outside,

The heating element is a ceramic composition comprising a rapid cooling steel making slag having a particle size of 5.0 mm or less, a sphericity of 0.5 or more, and silicon carbide particles having a particle size of 5.0 mm or less at a weight ratio of 100: 0.1 to 100.

In the present invention, the microwave generator or other magnetron is connected to a power source by a high voltage transformer 29, and an air cooling type cooling device (for example, a cooling fan 30) for cooling the heat generated in the microwave generator, It is preferable that an apparatus is provided.

In addition, it is preferable that a protective cover 31 for protecting the internal devices such as the microwave generator, the high voltage transformer, and the cooling device is fixed to the cavity cover 28-3.

The cavity 28 is provided with a temperature sensor 32 for detecting the temperature of the cavity. The temperature sensor is connected to the temperature controller 33 to control operation of the microwave generator and the cooling device according to the temperature of the cavity. .

In addition, it is preferable that a case 34 for protecting internal devices is provided outside the microwave generator, the waveguide, and the cavity.

Further, it is preferable that the heat insulating material 35 is attached to the cavity cover 28-3 in order to prevent the heat generated inside from being diverted to the opposite side of the heating object. Glass wool, gypsum, heat-resistant plastic, heat-resistant ceramic, heat-resistant paper or stone powder can be used as the material of the heat-insulating material.

Wherein the heating element comprises a metal oxide including an iron oxide compound and is heated by a microwave of 300 MHz to 300 GHz. Specifically, the heating element uses a heating element composition that generates heat by using the microwave described above. Specifically, the heating element has a quenching steel slag having a particle size of 5.0 mm or less, a sphericity of 0.5 or more, and silicon carbide particles having a particle size of 5.0 mm or less, Or a cured product obtained by mixing cement in a weight ratio of 0.1 to 50 to 100 parts by weight of the ceramic composition and curing the mixture by hydration with an appropriate amount of water is used.

The heating device that generates heat by the microwave of the present invention can quickly heat the surface of the object to be heated through the heating element only by generating microwaves by applying power to the micro generator.

The microwave generator, the waveguide, and the heating element are preferably modularized in the form of being mounted inside the cavity and installed in the heating object, but the present invention is not limited thereto and various design modifications are possible.

In particular, it is preferable that the waveguide has a tubular shape in which one end thereof is directly connected to the microwave generator and the other end is connected to a reflector having a closed space therein.

The microwave generator (magnetron) is connected to the high voltage transformer and the high voltage transformer is connected to the external power source. The high voltage transformer transforms a commercial AC voltage input from the outside into a high voltage (for example, about 2 kilovolts [kV]) suitable for generating a high frequency and applies it to the magnetron. The magnetron generates high frequency oscillation by a high voltage applied from a high voltage transformer Thereby generating microwaves.

It is preferable to use the 2,450 MHz band in order to utilize the advantage of the microwave frequency, such as Industrial, Scientific and Medical (ISM) frequency. However, it is not limited to this, Microwave having a frequency in the range of 300 GHz can be used in various ways.

A cooling device (e.g., a cooling fan) is installed around the magnetron to cool the high temperature generated by the magnetron when the magnetron is driven, a cooling device is connected to the fan motor, and a voltage (commercial AC voltage) When the motor is applied to the motor, the fan motor is operated, and the fan of the cooling device is driven by the fan motor to blow the external cool air to the magnetron, thereby cooling the high temperature generated in the magnetron.

The microwave generator is fixed to the side surface of one end of the waveguide by a fixing bracket and is connected to the side surface of one end of the waveguide by a coupling tube protruding from the back surface of the microwave generator, Can be delivered to the department.

These microwave generators are consumables and must be replaced when they reach their end of life. In the heating device according to the present invention, the microwave generator can be easily replaced as if replacing a bulb. Therefore, the microwave generator according to the present invention can be used permanently only when the microwave generator is replaced periodically or when a fault occurs.

In the present invention, the heating element is made of a heat resistant plate having a long length and a ceramic material (see FIG. 1). When a microwave is irradiated to a ceramic material plate having a high dielectric loss factor, And generates heat by rotation.

Meanwhile, as described above, since the microwave generator is installed on the side surface of one end of the waveguide to supply microwaves, a portion directly connected to the waveguide in the reflection portion receives a lot of microwaves and receives less influence of microwaves. In order to smoothly diffuse the microwaves, it is necessary to form a reflection plate, in other words, a distribution plate. In order that the microwave is substantially reflected in the distribution plate, a distribution hole should be formed in the middle of the distribution wave so as to absorb a certain amount of microwave .

Some forms of the distribution plate with distribution holes in the present invention are as shown in Fig.

As shown in FIG. 5, it is preferable that the distribution plate is formed symmetrically with respect to the waveguide without forming a distribution hole in the front portion of the waveguide. However, they are not necessarily provided symmetrically but may be provided asymmetrically. In this case, the shape of the dispensing hole may be variously designed such as a circle, an ellipse, and a square.

Further, since the density of the microwave is decreased as the distance from the waveguide decreases, it is preferable that the size of the distribution hole increases as the distance from the waveguide increases, so that the heat is further generated farther from the waveguide, Do.

Also, in the present invention, since the waveguide can be biased not only at the center of the distribution plate, but also at one point away from the waveguide, it is preferable that the distribution hole is optimally designed so that absorption of the microwave is smooth.

In the present invention, the material used as the distribution plate is preferably a material that reflects without absorbing microwaves, and examples thereof include steel, aluminum, or copper.

Further, in the present invention, it is preferable that the distribution plate has a smooth plate shape or a plate shape which is uneven on the surface.

The heating device that generates heat by the microwave according to the present invention can be utilized without limitation in a portion using heat generation. Concrete examples are embedded in walls or floors of architectural structures or embedded in the bottoms of greenhouses or plastic houses and used for internal heating or they are buried in roofs of bridges, roads, railway tracks, railway platforms, tunnel frames, It can be used for melting ice, for concrete curing molds, as a heating device for boilers or as a heating device for heaters.

FIG. 6 illustrates an example of curing a pillar-shaped concrete 40 such as a column or a pier using a heating device that generates heat by a microwave according to an embodiment of the present invention. There is shown an example of curing a flat concrete 41 such as a wall or a slab by using a heating device which generates heat by a microwave.

8 shows an example in which the present invention is applied to snow melting and melting of roads and sewage pipes 42 using a heating device that generates heat by a microwave according to an embodiment of the present invention. 8, devices such as a microwave generator, a high-voltage transformer, and a cooling plate are buried in the lower part of the road or the lower part of the sewer pipe (or upper part), and the waveguide 22 is connected to the outside It is preferable to provide the same.

As shown in FIGS. 6 to 8, when the heating device, which generates heat by the microwave according to the present invention, is attached to the heating surface of the object to be heated or embedded, and the electrode is connected to the microwave generating device, When power is supplied to the microwave generator, heat is generated in the heating element and the surface of the concrete to be heated is heated. At this time, the connection of the electrodes may be connected in series or parallel form, or a mixed form thereof, and may be selected according to the field conditions.

In particular, when the present invention is applied to the lower part of a road, it is expected that it will be possible to prevent wintering snow and freezing in winter, thereby reducing the use of calcium chloride which is harmful to the environment.

In addition, when the present invention is used in the formwork of a concrete structure, it is possible to heat and cure the concrete even under low temperature conditions such as winter or Siberia, thereby shortening the construction period.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. And should be construed as falling within the scope of protection.

10: MIP hardened body 20: Heating device which generates heat by microwave
21: Microwave generator 22: Waveguide
23: inner space 24:
25: Distribution board 26: Distribution board
27: heating element 28: cavity
28-1: bottom plate 28-2: side plate
28-3: Cavity cover 29: High voltage transformer
30: cooling fan 31: protective cover
32: temperature sensor 33: temperature controller
34: Case 35: Insulation
36: Capacitor 37: Capacitor holder
40: Base concrete 41: Flat concrete
42: Road or sewer

Claims (22)

As a heating element that generates heat by a microwave of 300 MHz to 300 GHz,
0.1 to 100 parts by weight of a rapid cooling steel making slag having a particle size of 5.0 mm or less and a sphericity of 0.5 or more and a silicon carbide particle having a particle size of 5.0 mm or less.
The heating element composition according to claim 1, wherein the heating element composition is a cured body obtained by mixing 100 parts by weight of the ceramic composition with 0.1 to 50 parts by weight of cement and curing the mixture by hydration with water.
The rapid-cooling steel making slag having a particle size of 5.0 mm or less and a sphericity of 0.5 or more is first sieved using a magnetic separator having a magnetic force of 500 gauss or more and then sieved to have a particle size of 5.0 mm or less And a sphere ratio of 0.5 or more is selected through a spherical sorting machine to obtain a heating element composition.
The heating element composition according to claim 2, wherein the cured body has a thickness of 1 to 100 mm.
The heating element composition according to claim 1, wherein the ceramic composition further comprises a metal oxide in a range of 0.1 to 100 parts by weight, and the size of the ceramic composition is 5.0 mm or less.
The method according to claim 5, wherein the metal oxide is _{Fe 2 O 3, Fe 3 O} 4, FeO, Al 2 O 3, CaO, SiO 2, which generates heat by the microwaves, characterized in that at least one kind of TiO _2, selected from MgO / RTI >
A microwave generator for generating microwaves;
A waveguide connected at one end to the microwave generator and having a pipe shape for receiving a microwave generated from the microwave generator and transmitting the received microwave to the reflector;
A reflector having a sealed inner space for diffusing the microwave transmitted from the waveguide and sharing the inner space with the waveguide;
A distribution plate provided on the opposite side with respect to the waveguide and the sealed inner space and having a distribution hole for passing a microwave that is irregularly reflected by the reflection portion;
A heating element which is provided on the opposite side of the reflection part and is in close contact with the distribution plate and absorbs microwaves passing through the distribution hole to generate heat; And
And a cavity cover which is connected to the upper ends of the side plates and forms a closed reflective part together with the side plates, And a cavity for transmitting heat generated from the heating element to the outside
And,
Wherein the heating element is a ceramic composition comprising a rapid cooling steel making slag having a particle size of 5.0 mm or less and a sphericity of 0.5 or more and silicon carbide particles having a particle size of 5.0 mm or less at a ratio of 100: 0.1 to 100 by weight. .
[Claim 7] The heating device according to claim 7, wherein the heating element is a cured product obtained by mixing 100 parts by weight of the ceramic composition with 0.1 to 50 parts by weight of cement, and curing the mixture by hydration with water.
The heating device according to claim 7, wherein the microwave generator is connected to a power source by a high voltage transformer.
[12] The heating device according to claim 9, wherein a cooling device for cooling the heat generated in the microwave generator is provided around the microwave generator.
The heating device according to claim 10, wherein a protective cover for protecting the microwave generator, the high voltage transformer, and the cooling device is fixed to the cavity cover.
The microwave generator according to claim 7, wherein the cavity is provided with a temperature sensor for detecting the temperature of the cavity, and the temperature sensor is connected to a temperature controller to control the operation of the microwave generator according to the temperature of the cavity. Heating device.
The heating device according to claim 7, wherein a case for protecting internal devices is provided outside the microwave generator, the waveguide, and the cavity.
The heating device according to claim 7, wherein a heat insulating material is attached to the cavity cover to prevent heat generated inside the cavity cover from being diverted to the opposite side of the heating object.
[8] The apparatus of claim 7, wherein the distribution hole is formed in a symmetric or asymmetric manner with respect to the wave guide, not in the front of the wave guide.
The heating device according to claim 7, wherein a size of the distribution hole increases as the distribution hole moves away from the wave guide.
The heating device according to claim 7, wherein the distribution holes are formed in a circular shape, an elliptical shape, or a rectangular shape.
The heating device according to claim 7, wherein the distribution plate is a steel material, an aluminum material, or a copper material.
The heating device according to claim 7, wherein the distribution plate is a plate-shaped or uneven plate-like shape.
[7] The heating device according to claim 7, wherein the heating device for generating heat by the microwave is embedded in a wall or floor of a building or embedded in a bottom of a greenhouse or a greenhouse for internal heating, Wherein the heating device is embedded in a tunnel frame or in a lower part of a drain pipe to be used for snow melting or ice melting, as a mold for concrete curing, or as a heating device for a boiler or a heating device for a hearth.
Attaching or embedding a heating device, which is heated by the microwave of claim 7, on a surface of a target object; And
Connecting an electrode to a heating device that generates heat by the microwave;
Wherein the microwave is heated by the microwave.
[20] The method of claim 21, wherein the electrodes are connected to a heating device that generates heat by microwaves in a series, parallel, or a combination mode.

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