KR102160801B1 - steam boiler - Google Patents

Abstract

The present invention relates to a steam boiler using a dielectric heat-generating body, and more specifically, to a steam boiler using a dielectric heat-generating body, which heats water by using the dielectric heat-generating body generating heat by a microwave and thus, can generate high-temperature steam within a short period of time. According to the present invention, the steam boiler using a dielectric heat-generating body comprises: a first heating unit which heats water by a microwave to generate steam; and a second heating unit which heats the steam generated by the first heating unit to generate steam with a higher temperature than that of the steam generated by the first heating unit. The first heating unit includes: a gasifying chamber which has an accommodation space inside to accommodate water; a first insulation layer formed to wrap around the gasifying chamber; a first casing formed to wrap around the first insulation layer; a first dielectric heat-generating body installed outside the gasifying chamber; and a first magnetron installed in the first casing to apply a microwave to the first dielectric heat-generating body and thus, make the first dielectric heat-generating body generate heat.

Description

Steam boiler using a dielectric heating element {steam boiler}

The present invention relates to a steam boiler using a dielectric heating element, and more particularly, to a steam boiler using a dielectric heating element capable of generating high temperature water vapor in a short time by heating water using a dielectric heating element that is heated by microwaves. will be.

In general, a boiler is a device for generating hot water or high-temperature steam by heating water in a sealed container and supplying it to a required place, and various types are used to generate hot water or steam.

A conventional boiler conventionally used here has a heat exchanger, a burner for heating the heat exchanger, and the like, and is configured to generate steam and hot water by heating the heat exchanger using a heat source generated from the burner.

However, conventional boilers have a problem of polluting the atmosphere due to emission of pollutants because most of them use fossil fuels as a heat source, as well as lower energy efficiency due to the use of combustion heat. There is a drawback to be operated.

Republic of Korea Patent Publication No. 10-2011-0069570 discloses a boiler using a microwave.

The boiler is configured such that the outer cylinder, the inner cylinder, the heating outer case and the heating inner case are located in a concentric circle, and an insulation material is formed between the outer cylinder and the inner cylinder, and water is filled between the inner cylinder and the heating outer case, and the heating outer case Air is filled between the heating inner case and the heating inner case is composed of a heating element that generates heat in response to the microwave generated by the magnetron, and a waveguide which is a transmission path for transmitting the microwave generated from the magnetron to the heating element. The heat generated from the heating element is transferred to the water via air to heat the water.

The boiler has a problem that the structure is complex and the efficiency is low. In addition, there is a problem in that it is difficult to generate high-temperature superheated steam.

Republic of Korea Patent Publication No. 10-2011-0069570: Boiler using microwave

The present invention was created to improve the above problems, and is to provide a steam boiler having a simple structure and capable of generating water vapor in a short time by configuring a dielectric heating element that is heated by microwaves to surround a space where water is stored. There is a purpose.

Another object of the present invention is to provide a steam boiler capable of generating high-temperature superheated steam through a two-stage heating structure in which water is heated to generate steam, and then steam is heated again.

A steam boiler using the dielectric heating element of the present invention for achieving the above object comprises: a primary heating unit for generating steam by heating water by microwave; And a secondary heating unit that heats the water vapor generated in the primary heating unit to generate water vapor having a higher temperature than the water vapor generated in the primary heating unit, wherein the primary heating unit is capable of receiving water. A vaporization chamber having an accommodation space therein, a first insulating layer formed to surround the vaporization chamber, a first casing formed to surround the first insulating layer, a first dielectric heating element installed outside the vaporization chamber, the And a first magnetron installed in the first casing to heat the first dielectric heating element by applying a microwave to the first dielectric heating element.

In order to prepare for thermal expansion of the vaporization chamber, the inner diameter of the first dielectric heating element is larger than the outer diameter of the vaporization chamber, so that an air gap is formed between the first dielectric heating element and the vaporization chamber.

The air gap is filled with a heat transfer member in the form of a powder.

The first dielectric heating element is composed of at least two panel portions that are separable from each other to prepare for thermal expansion of the vaporization chamber, and the panel portions are formed in a semi-arc shape to surround one side of the vaporization chamber; and , A second panel part positioned to face the first panel part and formed in a semi-arc shape to surround the other side of the vaporization chamber, and a first coupling protrusion is formed at an end of the first panel part, and the second panel At the end of the negative, the first coupling jaws and the second coupling jaws overlapped are formed.

And a support means for supporting the first and second panel parts to the vaporization chamber, the support means being fixed to an outer circumferential surface of the vaporization chamber and passing through the first and second panel parts, and the fixing rod And a pressing plate that is movably coupled to the first and second panel portions and is in close contact with the first and second panel portions, and an elastic member that is installed on the fixing rod and presses the pressing plate toward the first and second panel portions.

The secondary heating unit is connected to the vaporization chamber through a connection pipe, the superheating chamber into which the steam generated from the vaporization chamber flows, a second insulating layer formed to surround the superheating chamber, and a second insulating layer formed to surround the second insulating layer. And a second casing, a second dielectric heating element installed outside the overheating chamber, and a second magnetron installed in the second casing to heat the second dielectric heating element by applying microwaves to the second dielectric heating element.

The secondary heating unit is connected to the vaporization chamber through a connection pipe, the superheating chamber into which the steam generated from the vaporization chamber flows, a second insulating layer formed to surround the superheating chamber, and a second insulating layer formed to surround the second insulating layer. It includes a casing and an electric heater installed inside or outside the overheating chamber to heat water vapor introduced into the overheating chamber.

As described above, the present invention can provide a steam boiler having a simple structure and capable of generating steam in a short time by configuring a dielectric heating element heated by a microwave to surround a space in which water is stored.

In addition, the present invention can generate high-temperature superheated steam through a two-stage heating structure in which water is heated to generate steam and then the steam is heated again.

1 is a partially cut-away cross-sectional view showing the interior of a steam boiler according to an example of the present invention,
2 is a cross-sectional view of a main part of FIG. 1,
3 is a cross-sectional view showing a main part of a steam boiler according to another example of the present invention,
4 is a cross-sectional view showing another main part of the steam boiler applied to FIG. 3.

Hereinafter, a steam boiler using a dielectric heating element according to a preferred embodiment of the present invention will be described in detail.

The steam boiler of the present invention generates high-temperature steam, and the steam generated by the present invention is for supplying high-temperature steam to facility house heating, aquaculture plant heating, agricultural and marine products dryer, hot water extraction and concentration of food, etc., for drying livestock manure, and sewage sludge. Or it can be used for various purposes such as drying food waste and drying various kinds of waste with high moisture content.

Referring to FIGS. 1 and 2, the steam boiler of the present invention heats water by a microwave to generate water vapor, and heats water vapor generated in the primary heating unit 10. It includes a secondary heating unit (50) for generating water vapor having a higher temperature than the water vapor generated in the first heating unit (10).

The primary heating unit 10 includes a vaporization chamber 11 formed therein with a receiving space 13 capable of receiving water, a first insulating layer 15 formed to surround the vaporization chamber 11, and a first insulating layer. (15) A first casing 17 formed to surround, a first dielectric heating element 21 installed on the outer circumferential surface of the vaporization chamber 11, and a first dielectric heating element 21 installed in the first casing 17 A first magnetron 30 is provided to generate heat by applying a microwave to the first dielectric heating element 21.

The vaporization chamber 11 has a hollow tube structure. The vaporization chamber 11 is formed of a metal material capable of withstanding sufficient pressure. The interior of the vaporization chamber 11 is formed with a receiving space 13 capable of accommodating water.

A water inlet pipe 12 through which water is introduced is connected to the side of the vaporization chamber 11. In addition, a drain pipe 18 capable of discharging water is connected to a lower portion of the vaporization chamber 11. In addition, a connection pipe 35 capable of discharging the generated steam to the secondary heating unit 50 is installed on the upper part of the vaporization chamber 11. In addition, a thermometer 19 capable of measuring the internal temperature of the vaporization chamber 11 is installed.

A first heat insulating layer 15 is formed outside the vaporization chamber 11. The first insulating layer 15 is formed to surround the vaporization chamber 11 in all directions. The first insulating layer 15 is made of a heat-resistant material so as not to be damaged by high temperature heat.

The first casing 17 is formed to surround the first heat insulating layer 15 to form the outer shape of the primary heating unit 10. The first casing 17 may be formed of a highly durable metal material.

The first dielectric heating element 21 is installed outside the vaporization chamber 11. In the illustrated example, the first dielectric body 21 is formed in an annular shape to surround the side surface of the vaporization chamber 11.

The first dielectric heating element 21 is made of a material that generates heat at a high temperature by microwaves. An example of the first dielectric heating element 21 may be formed of a material in which alumina oxide is mixed with silicon carbide. When microwaves are applied to the first dielectric heating element 21, the first dielectric heating element 21 heats the vaporization chamber 11 while generating heat.

When the vaporization chamber 11 is heated by the first dielectric heating element 21, the vaporization chamber 11 made of a metal material increases in volume due to thermal expansion. In this case, there is a concern that the first dielectric heating element 21 surrounding the vaporization chamber 11 may be damaged. In the present invention, it is preferable that an air gap is formed between the first dielectric heating element 21 and the vaporization chamber 11 to prepare for the thermal expansion of the vaporization chamber 11.

In order to form the air gap, the present invention makes the inner diameter of the first dielectric heating element 21 larger than the outer diameter of the vaporization chamber 11. Accordingly, an air gap, which is an empty space, is formed between the inner peripheral surface of the first dielectric heating element 21 and the outer peripheral surface of the vaporization chamber 11. Damage of the first dielectric heating element 21 can be prevented by leaving a free space in which the vaporization chamber 11 can expand by heat due to the air gap.

On the other hand, it is preferable that the heat transfer member 23 in the form of powder is filled in the air gap to increase the heat transfer efficiency. As such a heat transfer member, a material having high thermal conductivity may be used. For example, the same material as the material of the first dielectric heating element may be used as the heat transfer member 23. As described above, by filling the air gap with the heat transfer member 23 in the form of powder, heat conduction may be increased, and expansion of the vaporization chamber may be allowed due to voids between the heat transfer member particles.

In the illustrated example, the heat transfer member 23 is filled in the air gap, but as described above, the heat transfer member is not filled and may be composed only of an air gap that is an empty space.

A plurality of first magnetrons 30 are installed outside the first casing 17 at regular intervals. The first magnetron 30 applies microwaves to the inside of the first casing 17 through the waveguide.

The first magnetron 30 receives power and oscillates a microwave by an oscillation circuit. The microwave generated by the first magnetron 30 has a frequency of approximately 800 MHz to 300 GHz.

When microwaves are applied to the first dielectric heating element 21, the first dielectric heating element 21 generates heat at a high temperature and heats the water contained in the vaporization chamber 11. Accordingly, water vapor is generated in a short time.

The steam generated in the above-described primary heating unit 10 is heated once more in the secondary heating unit 50 to generate high-temperature superheated steam.

The secondary heating unit may further heat the steam generated in the primary heating unit 10 by using a microwave or an electric heater.

The illustrated secondary heating unit shows a state of heating water vapor using microwaves.

The secondary heating unit 50 is connected to the vaporization chamber 11 and the connection pipe 35 to surround the superheating chamber 51 and the superheating chamber 51 into which the steam generated in the vaporization chamber 11 flows in. The second insulating layer 53, a second casing 55 formed to surround the second insulating layer 53, a second dielectric heating element 57 installed outside the overheating chamber 51, and a second casing 55 ) Is provided with a second magnetron 60 for heating the second dielectric heating element 57 by applying microwaves to the second dielectric heating element 57.

The overheating chamber 51 has a hollow tube structure. The overheating chamber 51 has a receiving space 52 that can accommodate water vapor therein. The overheating chamber 51 is formed of a metal material capable of withstanding sufficient pressure.

A connection pipe 35 is connected to the front of the overheating chamber 51. The water vapor discharged from the vaporization chamber 11 flows into the superheat chamber 51 through the connection pipe 35. A valve for opening and closing the flow path is installed in the connection pipe 35. A discharge pipe 58 through which the superheated steam generated from the superheated chamber 51 is discharged is installed at the rear of the superheating chamber 51. A thermometer 59 capable of measuring the temperature of water vapor is installed in the discharge pipe 58.

A second heat insulating layer 53 is formed outside the overheating chamber 51. The second heat insulating layer 53 is formed to surround all four sides of the overheating chamber 51. The second insulating layer 53 is made of a heat-resistant material so as not to be damaged by high temperature heat.

The second casing 55 is formed to surround the second heat insulating layer 53 to form the outer shape of the secondary heating unit 50. The second casing 55 may be formed of a highly durable metal material.

The second dielectric heating element 57 is installed outside the overheating chamber 51. In the illustrated example, the second dielectric heating element 57 is formed in an annular shape to surround the side surface of the overheating chamber 51.

The second dielectric heating element 57 is made of a material that generates heat at a high temperature by microwaves. As an example of the second dielectric heating element 57, it may be made of a material in which alumina oxide is mixed with silicon carbide. When microwaves are applied to the second dielectric heating element 57, the second dielectric heating element 57 heats the overheating chamber 51 while generating heat.

When the superheat chamber 51 is heated by the second dielectric heating element 57, the superheat chamber 51 made of a metal material becomes bulky due to thermal expansion. In this case, there is a concern that the second dielectric heating element 57 surrounding the overheating chamber 51 may be damaged. Therefore, like the primary heating unit 10, the secondary heating unit 50 has an air gap formed between the second dielectric heating element 57 and the overheating chamber 51, and the heat transfer member 56 in the form of a powder in the air gap Is filled.

The second magnetron 60 is installed outside the second casing 55 at regular intervals. The second magnetron 60 applies microwaves into the second casing 55 through the waveguide.

The second magnetron 60 receives power and oscillates a microwave by an oscillation circuit. The microwave generated by the second magnetron 60 has a frequency of approximately 800 MHz to 300 GHz.

When the microwave is applied to the second dielectric heating element 57, the second dielectric heating element generates heat at a high temperature and heats the steam accommodated in the superheat chamber 51. Accordingly, high-temperature superheated steam is generated.

As described above, the present invention can generate water vapor in a short time by configuring the dielectric heating element heated by microwaves to surround a space in which water is stored, and the structure is simple. In addition, the present invention can generate high-temperature superheated steam through a two-stage heating structure in which water is heated to generate steam and then the steam is heated again.

As another example of the secondary heating unit, steam may be heated using an electric heater.

Although not shown, the secondary heating unit is connected to the vaporization chamber through a connection pipe, and the superheating chamber into which the steam generated from the vaporization chamber flows in, the second insulating layer formed to surround the superheating chamber, and the second casing formed to surround the second insulating layer. And, an electric heater installed inside or outside the overheating chamber to heat steam flowing into the overheating chamber.

The superheating chamber, the second heat insulating layer, and the second casing are the same as those applied to the secondary heating unit using microwaves described above.

The electric heater is installed inside or outside the overheating chamber. As the electric heater, various types of known heaters can be used. The electric heater is connected to the power source and operated by supplying it to the power source. The water vapor introduced into the overheating chamber can be heated to a high temperature by such an electric heater.

On the other hand, the present invention shows the state of the primary heating unit applied to the steam boiler according to another embodiment in FIGS. 3 and 4.

3 and 4, the first dielectric heating element is formed of a plurality of panel parts. This is to prepare the vaporization chamber 11 to be separated from each other in preparation for thermal expansion.

For example, the first dielectric heating element is positioned to face the first panel portion 71 formed in a semi-arc shape to surround one side of the vaporization chamber 11, and the other side of the vaporization chamber 11 It includes a second panel portion 75 formed in a semi-arc shape to surround the.

The first panel portion 71 is installed to contact the outer peripheral surface of the vaporization chamber 11. First coupling projections 72 and 73 are formed at both ends of the first panel portion 71. The first coupling protrusion 72 formed at one end of the first panel portion 71 is formed to protrude in a direction in which the outer peripheral surface of the first panel portion 71 extends. In addition, the first coupling protrusion 73 formed at the other end of the first panel portion 71 is formed to protrude in a direction in which the inner peripheral surface of the first panel portion 71 extends.

The second panel portion 75 is installed to contact the outer peripheral surface of the vaporization chamber 11. The second panel portion 75 is positioned to face the first panel portion 71.

Second coupling protrusions 76 and 77 are formed at both ends of the second panel portion 75. The second coupling protrusion 76 formed at one end of the second panel portion 75 is formed to protrude in a direction in which the outer peripheral surface of the second panel portion 75 extends. In addition, the second coupling protrusion 77 formed at the other end of the second panel portion 75 is formed to protrude in a direction in which the inner peripheral surface of the second panel portion 75 extends.

The second coupling jaws 76 and 77 of the second panel portion 75 are overlapped with the first coupling jaws 72 and 73 of the first panel portion 71, respectively.

In addition, the first and second panel portions 71 and 75 are supported by support means. The first and second panel portions 71 and 75 are supported by the vaporization chamber 11 by the support means.

The support means 80 is, for example, fixed to the outer circumferential surface of the vaporization chamber 11 so as to be movable to the fixing rod 81 and the fixing rod 81 passing through the first and second panel portions 71 and 75. The pressure plate 83 is coupled to the first and second panel portions 71 and 75, and is installed on the fixing rod 81 so that the pressure plate 83 is connected to the first and second panel portions 71 and 75. It includes an elastic member 85 for pressing in the direction.

In the illustrated example, the shape of the supporting means for supporting the second panel portion 75 is shown. Since the structure of the support means for supporting the first panel portion 71 is the same as the support means for supporting the second panel portion 75, a detailed description will be omitted.

The fixing rod 81 is fixed to the outer peripheral surface of the vaporization chamber 11. The fixing rod 81 protrudes for a certain length in the outward direction of the vaporization chamber 11. A through hole 79 is formed in the second panel portion 71 so that the fixing rod 81 can penetrate the second panel portion 75. A head portion 82 is coupled to the end of the fixing rod 81. The head portion 82 is formed to have a larger diameter than the fixing rod 81. The head portion 82 may be screwed to the fixing rod 81.

The pressure plate 83 is in close contact with the outer peripheral surface of the second panel portion 75. The pressing plate 83 is formed to be bent in a curved surface to increase the contact area with the second panel portion 75. The pressing plate 83 is formed with a circular insertion hole. The fixing rod 81 passes through the insertion hole.

The elastic member 85 is positioned between the pressing plate 83 and the head portion 82. A spring may be used as the elastic member 85. One side of the spring is supported by the pressure plate 83, and the other side of the spring is supported by the head portion 82. This elastic member serves to press the pressing plate 83 in the direction of the second panel portion 75.

Even if the vaporization chamber 11 is thermally expanded by the above-described structure, since the first panel portion 71 and the second panel portion 75 are opened in a direction away from each other, damage to the first dielectric heating element can be effectively prevented.

On the other hand, the structure of the first dielectric heating element described above can be applied equally to the second dielectric heating element, and in this case, it goes without saying that the second dielectric heating element can be supported by the above-described support means.

In the above, the present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent embodiments are possible therefrom. Therefore, the true scope of protection of the present invention should be determined only by the appended claims.

10: primary heating unit 11: vaporization chamber
15: first insulating layer 17: first casing
21: first dielectric heating element 23: heat transfer member
30: first magnetron 35: connector
50: secondary heating unit 51: overheating chamber
53: second insulating layer 55: second casing
57: second dielectric heating element 60: second magnetron

Claims (7)

A primary heating unit that heats water by microwave to generate steam;
And a secondary heating unit that heats the steam generated in the primary heating unit to generate steam having a higher temperature than the steam generated in the primary heating unit, and
The primary heating unit includes a vaporization chamber having a receiving space for receiving water therein, a first insulating layer formed to surround the vaporization chamber, a first casing formed to surround the first insulating layer, and the vaporization chamber And a first dielectric heating element installed outside of and a first magnetron installed in the first casing to heat the first dielectric heating element by applying microwaves to the first dielectric heating element,
The secondary heating unit is connected to the vaporization chamber through a connection pipe, the superheating chamber into which the steam generated from the vaporization chamber flows, a second insulating layer formed to surround the superheating chamber, and a second insulating layer formed to surround the second insulating layer. 2. A steam boiler using a dielectric heating element, comprising: a casing and an electric heater installed inside or outside the superheating chamber to heat the steam introduced into the superheating chamber. The method of claim 1, wherein an inner diameter of the first dielectric heating element is formed larger than an outer diameter of the evaporation chamber to prepare for thermal expansion of the evaporation chamber, and an air gap is formed between the first dielectric heating element and the evaporation chamber. Steam boiler using a dielectric heating element. The steam boiler using a dielectric heating element according to claim 2, wherein the air gap is filled with a heat transfer member in the form of a powder. The method of claim 1, wherein the first dielectric heating element is made of at least two panel portions that can be separated from each other to prepare for thermal expansion of the vaporization chamber,
The panel portions include a first panel portion formed in a semi-arc shape to surround one side of the vaporization chamber, and a second panel portion positioned to face the first panel portion and formed in a semi-arc shape to surround the other side of the vaporization chamber. Includes,
A steam boiler using a dielectric heating element, wherein a first coupling jaw is formed at an end portion of the first panel portion, and a second coupling jaw overlapped with the first coupling jaw is formed at an end portion of the second panel portion. The method of claim 4, further comprising a support means for supporting the first and second panel portions to the vaporization chamber,
The support means is fixed to the outer circumferential surface of the vaporization chamber, a fixing rod passing through the first and second panel portions, a pressure plate movably coupled to the fixing rod and in close contact with the first and second panel portions, and the fixing Steam boiler using a dielectric heating element, characterized in that it has an elastic member installed on the rod to pressurize the pressure plate toward the first and second panel portions. delete delete

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