JP2003297537A - Steam superheater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam superheater with an excellent superheated steam- generating efficiency without taking an installation floor area and at low cost. <P>SOLUTION: The steam superheater 11 operates as a water level of water 13 of an under-water zone in each tube body 12a is adjusted and a high-frequency current is supplied from a power source part 21 to an induction coil 15. When supplied with the high-frequency current, the induction coil 15 generates a high-frequency alternate magnetic field. An induction current flows in each tube body 12a by the alternate magnetic field, and each tube body 12a is heated for the whole length by Joule loss caused by the induction current. Thus, the water 13 of the under-water zone of the tube body 12a proceeds to a space zone above in a stage of steam not exceeding 100°C, and the steam is further heated while it passes the space zone to be outputted as super-heated steam exceeding 100°C. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a superheated steam generator for heating steam to generate superheated steam.

[0002]

2. Description of the Related Art Conventionally, as this type of superheated steam generator, there is, for example, a superheated steam generator 2 used in a heat treatment apparatus 1 shown in FIG.

The heat treatment apparatus 1 comprises a superheated steam generator 2, a processing chamber 3 and a chimney 4, and the superheated steam generator 2 comprises a boiler section 5 and a superheat section 6. Induction coils 5b and 6b are respectively wound around the outer periphery of the container 5a of the boiler section 5 and the pipe 6a of the heating section 6. When a high frequency current is applied to the induction coil 5b from the power supply device, an induction current is applied to the conductive container 5a,
The water stored in the container 5a when the container 5a is heated is 100
Water vapor does not exceed ℃. This steam is introduced into the atmospheric pressure pipe 6a of the superheater 6, and when a high-frequency current is applied to the induction coil 6b from another power supply device, the induction current flows in the conductive pipe 6a and the pipe 6a is heated. By doing 1
It becomes superheated steam above 00 ° C. The amount of steam generated in the boiler part 5, that is, the amount of superheated steam, and the temperature of the superheated steam generated in the superheat part 6 are independently adjusted by adjusting the power supply amount to each induction coil 5b, 6b. Controlled.

The superheated steam generated in the superheater 6 is treated in the processing chamber 3
Waste oil, waste plastic, food waste, food, equipment, etc. introduced into the processing chamber 3 are heat-treated by high-temperature superheated steam, and dried, reduced in volume, cooked, sterilized and the like. Waste oil and the like are thermally decomposed by this heat treatment, and the exhaust gas generated at that time is discharged to the outside through the chimney 4.

[0005]

However, since the conventional superheated steam generator 2 has a structure in which steam is generated in the boiler section 5 and superheated steam is generated in the superheat section 6, a large installation floor area is required. And In order to generate superheated steam, two power sources, a power supply device for energizing the induction coil 5b of the boiler part 5 and a power supply device for energizing the induction coil 6b of the overheating part 6, and energization from these two power supplies. Two control systems are required to control each of these. Therefore, the conventional superheated steam generator 2 is expensive.

Further, in the above conventional superheated steam generator 2, when the steam generated in the boiler section 5 contains mist, this mist is discharged as a drain to the pipe 6a of the superheat section 6. Therefore, in the above-described conventional superheated steam generator 2, heat energy is required for the drain discharged to the pipe 6a to become steam again, and the pipe 6a and by extension rise until the temperature of the superheated steam reaches the desired set temperature. It takes time. In addition, drains appear and stay in the superheater 6 irregularly both locally and temporally, which causes the amount and temperature of the superheated steam to be output to be unstable.

Therefore, when the superheated steam generator 2 is used in the heat treatment apparatus 1 as described above, for example, the heat treatment capacity is reduced by the rise time. In addition, the heat treatment at a low temperature within the rise time or at a non-constant temperature may cause deterioration of treatment quality such as insufficient thermal decomposition.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is an electrically conductive cylindrical body which is erected vertically and has a lower end side of the hollow interior as a water retention zone. Alternatively, a non-conductive cylindrical body in which a conductive material is provided over substantially the entire length of the hollow interior, a water supply unit that supplies water to the water retention zone, and a water level adjustment mechanism that adjusts the water level in the water retention zone. The superheated steam generator is provided with an induction coil wound around a water retention zone and a space zone left above the outer periphery of the cylindrical body.

In this structure, the AC magnetic flux generated by passing a high-frequency current through the induction coil reaches the conductive material provided in the conductive cylindrical body or the non-conductive cylindrical body and becomes conductive. An induced current flows through the cylindrical body or material, and the conductive cylindrical body or material generates heat over its entire length due to its Joule heat. Due to this heat generation, the water in the water retention zone becomes steam not exceeding 100 ° C and advances to the upper space zone, and this steam is further overheated while passing through the space zone and becomes superheated steam exceeding 100 ° C. Will be output.

The amount of superheated steam generated and the temperature thus output can be controlled simply by adjusting only the power supplied to the induction coil and the water level in the water retention zone. The operation of this control is as follows.

FIG. 2 is a diagram schematically showing the basic structure of the device of the present invention, in which the conductive cylinder 7 has a water retention zone 7a and a space zone 7b, and the induction coil 8 is uniform. It is wound on the pitch. It is assumed that the ratio of the length of the water retention zone 7a to the space zone 7b is θ / (1−θ) as shown in the figure, and the electric power P is supplied to the induction coil 8.

Assuming that the superheated steam generating operation has reached a steady state with this setting, the generated amount (per unit time) v of the superheated steam output from the space zone 7b is
Since it is equal to the evaporation rate from the water retention zone 7a, it is expressed by the following equation (1) with k ₁ as a constant. v = k ₁ θP (1)

Superheated steam output from the space zone 7b
Temperature T is the temperature of the water vapor evaporated from the water retention zone 7a
Is T₀, The temperature rise during passing through the space zone 7b is Δ
T, k _Two, K_ThreeIs expressed as the following equation (2), where
It   T = T₀+ ΔT = T₀+ K_Two(1-θ) P / v                = T₀+ K_Three(1-θ) / θ                = T₀+ K_Three{(1 / θ) -1} (2)

The relationship between the above equations (1) and (2) is shown in FIG.

As can be seen from the equations (1), (2) or FIG. 3, when it is desired to increase only the amount v of superheated steam generated, the power supply P is increased with the water level θ in the water retention zone 7a unchanged. Further, when it is desired to raise only the temperature T, the water level θ is lowered, and on the other hand, the product θP of the water level θ and the supplied power P
Increase P so that is kept constant. Furthermore, when it is desired to increase both the generated amount v and the temperature T, the water level θ may be lowered, and even if the water level θ is lowered, the product θP may be increased to a level at which the product θP increases.

The above description is a first-order approximation for showing the operation of the present invention, and the actual operation mode is experimentally specified.

The present invention also provides a conductive cylindrical body, or
A plurality of non-conductive cylinders provided with conductive materials are arranged, and a relay chamber connected to the hollow inside of each cylinder is arranged at the lower end of this cylinder group. The water output from this is supplied to the water retention zone via this relay room,
The induction coil is characterized in that it is wound around the comprehensive outer circumference of this cylinder group.

According to this structure, the stored water is dispersed in the plurality of cylinders. Regarding the relationship between the water and water vapor in the cylinder with the conductive cylinder or the conductive material that is the heating element, the heat transfer distance becomes shorter and the contact area increases. Therefore, the heat supply from the conductive cylinder or the conductive material to the water in the water retention zone and the steam in the space zone is performed more efficiently than in the case where the number of cylinders is one.

Further, water can be supplied from the water supply unit to each of the cylinders at the same time for all the cylinders by performing the water supply to one relay chamber connected to the lower end of each cylinder.

Further, the present invention is characterized in that the plurality of conductive cylinders, or the conductive material and the non-conductive cylinder are non-magnetic.

According to this structure, the AC magnetic field generated by the energization of the induction coil is less likely to be attenuated even in the tubular body inside the depth direction of the tubular bodies arranged in plural.

Further, the present invention is characterized in that the water level adjusting mechanism is a mechanism for adjusting the water level in the water retention zone by adjusting the ground water level of the water supply section.

According to this structure, for example, by raising or lowering the water supply unit itself or changing the atmospheric pressure of the upper space of the water stored in the water supply unit, the groundwater level of the water supply unit changes, As the water level changes, the water level in the water retention zone in the cylinder that is in balance with the atmospheric pressure also changes.

Further, according to the present invention, the induction coil is made of a metal tube, and the water output from the water supply section is retained in a preheated state by cooling the induction coil through the hollow inside of the induction coil. It is characterized by being supplied to the water zone.

According to this structure, the water in the water supply portion is supplied to the tubular body through the hollow portion of the tube of the induction coil. Since the induction coil, which has been heated by the passage of the high-frequency current, serves as the cooling water, it is preheated, so that the thermal efficiency of the device is improved.

Further, the present invention is characterized in that the number of turns of the induction coil in the water retention zone is denser than that in the spatial zone.

According to this structure, the induction coil portion around the outside of the water retention zone generates a stronger AC magnetic field than the induction coil portion around the outside of the space zone. Therefore, a larger induction current is generated in the conductive cylinder or the conductive material in the water retention zone than in the conductive cylinder or the conductive material in the space zone, and a large amount of heat energy is generated. The ability to generate the original steam is increased.

Further, the present invention is characterized in that a heat insulating material is provided between the induction coil and the cylindrical body.

According to this structure, the heat insulating material shields the cylindrical body from the atmosphere around the outside, and the heat in the cylindrical body can be prevented from escaping to the outside.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the superheated steam generator according to the present invention will be described.

FIG. 4A shows a schematic structure of the superheated steam generator 11 according to this embodiment.

The superheated steam generator 11 comprises a tube group 12 composed of a plurality of hollow cylindrical conductive tubes 12a. Each pipe 12a is vertically erected on a relay chamber 12b connected to each hollow interior via its respective lower end, and water 13 is stored in each hollow interior. The upper end of the hollow inside of each tube 12a is a header 12 for discharging superheated steam.
The hollow cylindrical portion formed in the head portion of the header 12c is connected to the internal space of c, and is connected to the above-described processing chamber 3 in which the heat treatment is performed.

The water supply tank 14 supplies the water 13 taken from the water supply port 14a to the relay chamber 12b, thereby supplying the water 13 to each pipe body 12a. In this embodiment, the water supply tank 14 stores approximately 10 liters of water 13. The water level of the water 13 in each tube 12 is adjusted by a water level adjusting mechanism (not shown). This water level adjusting mechanism raises and lowers the ground water level of the water supply tank 14 in the direction shown by the arrow in the figure,
It is a mechanism that adjusts the water level of the water 13 in each pipe body 12 a, and raises or lowers the water supply tank 14 itself or changes the internal air pressure of the upper space of the water 13 stored in the water supply tank 14 to supply water. The water level above ground in the tank 14 is raised or lowered.

An induction coil 15 is wound around the comprehensive outer circumference of the tube group 12. The induction coil 15 extends over the outer circumference of the water retention zone in which the water 13 of the tubular body 12a is stored and the outer circumference of the space zone above the water retention zone, and the outer circumference of the water retention zone is a two-layer winding. There is. The induction coil 15 is made of a hollow and conductive copper pipe. The water supply tank 14 supplies water 13 supplied from the vertically upper end 15a of the induction coil 15 and passing through the hollow portion of the pipe and taken out from the other end 15b of the induction coil 15 to the relay chamber 12b.

FIG. 5 shows a schematic cross section of the tube group 12 along a direction orthogonal to its center line. In this embodiment, the height h is about 400 to 500 [mm], and the cross section is included. The target diameter φ is set to about 200 to 300 [mm].
A first heat insulating material 16 is provided between the comprehensive outer circumference of the tube group 12 and the induction coil 15, and a second heat insulating material 17 is further provided at the outer circumference of the induction coil 15. The plurality of tubular bodies 12a are
A plurality of concentric circles 30a, 30b, 30 are distributed in parallel with each other in a non-contact state and also in the depth direction from the outer periphery of the tube group 12 toward the tube 12a arranged at the center O.
It is located on c.

The tubular body 12a is for heating the inside by being induction-heated by the induction coil 15 itself.
It is electrically conductive so that it can be heated by induction, and is made of a non-magnetic material so as not to attenuate the AC magnetic field generated by the induction coil 15 when it enters the central region. As such a material,
For example, austenitic stainless steel having both heat resistance and corrosion resistance can be used.

Both ends 15a and 15b of the induction coil 15 are electrically connected to the terminals 21a and 21b of the power supply section 21 shown in FIG. 4 (b). The power supply unit 21 receives power from an AC power supply 22 that generates AC 200 [V],
The rectifier 23 converts 0 [V] into a pulsating flow of 200 [V]. The converted pulsating flow 200 [V] is smoothed by the capacitor 24, and the rectangular wave AC 25 is generated by the oscillator 25.
Converted to 0 [V]. A capacitor 26 is provided on the output side of the oscillator 25, and the output terminal 21 of the power supply unit 21 is
Induction coil 15 and capacitor 2 connected to a and 21b
A resonant circuit is formed by 6 and. Due to the resonance of the resonance circuit, a high frequency current having a frequency of about 20 [kHz] flows through the induction coil 15.

The configuration of the power supply section 21, voltage, frequency,
Numerical values of electric power are only examples in this embodiment, and do not limit the present invention.

In such a structure, prior to the operation of the superheated steam generator 11, each tube 12 is responsive to the amount and temperature of the superheated steam to be generated by the present apparatus 11.
The water level of the water 13 in a is adjusted. This adjustment is performed by adjusting the water level of the water supply tank 14 by the water level adjusting mechanism of the water supply section described above. After this water level adjustment, the induction coil 15 is supplied with a high-frequency current having a current value combined and adjusted with the water level from the power supply unit 21 to operate the superheated steam generator 11. When a high frequency current is supplied to the induction coil 15, the induction coil 15 generates a high frequency AC magnetic field. An induced current flows through each tube 12a by this alternating magnetic field, and each tube 12a is heated over its entire length by Joule loss caused by this induced current.

Therefore, when the pipe body 12a in the water retention zone is heated, the water 13 stored in the pipe body 12a becomes 10
It becomes steam that does not exceed 0 ° C. and advances to the upper space zone. This steam is further heated while passing through the space zone by heating the tube 12a of the space zone, and becomes superheated steam that exceeds 100 ° C. Will be output. This superheated steam is introduced into, for example, the processing chamber 3 described above and used for heat treatment of waste oil and the like.

Before the water 13 is supplied to each tube 12a, an electric current is supplied to the induction coil 15 to supply each tube 12a.
If you preheat in advance, superheated steam at the desired temperature,
It can be generated quickly with almost no rise time. Water to be initially introduced into each tube 12a is 1
Preheating to near 00 ° C is also useful for quick onset.

Further, as described above with reference to FIGS. 2 and 3, when it is desired to increase only the amount v of superheated steam generated per unit time, the water level θ in the water retention zone of the pipe 12a remains unchanged. The power supply P from the unit 21 is increased. If you want to raise only the temperature T of superheated steam,
The water level θ is lowered, and on the other hand, the supplied power P is increased so that the product θP of the water level θ and the supplied power P in the equation (1) is kept constant. Furthermore, when it is desired to increase both the generated amount v and the temperature T, the water level θ is lowered, and even if the water level θ is lowered, the product θP is increased to a level at which the product θP still increases. By this adjustment, the temperature T of the superheated steam is 300 to 600 ° C. when drying or reducing the volume of the organic waste, 200 to 800 ° C. when treating the food residue, and the sterilization / washing treatment. It is set in the range of 200 to 400 ° C.

According to the heat treatment apparatus of the present embodiment as described above, as described above, the portion of the induction coil 15 wound around the outside of the water retention zone of the pipe body 12a is used to form the pipe body 12.
The water 13 stored in a becomes steam not exceeding 100 ° C. and advances to the upper space zone, and this steam is further heated while passing through the space zone and is output as superheated steam exceeding 100 ° C. .

As described above, since the boiler section for producing steam and the superheating section for producing superheated steam are integrally constituted by the vertical tube group 12, the heat from the boiler section to the superheating section is heated. There is no loss and thermal efficiency is excellent, and part of the mist generated in the boiler part is drained and constantly returns to the water retention zone, and the remaining mist is quickly dried in the upper heating part. . Therefore, not only the superheated steam at the desired set temperature can be obtained with almost no rise time, but the appearance and stay of irregular drains in the superheated part are eliminated, and the amount and temperature of the superheated steam to be output are Stabilize. That is, favorable results are obtained in terms of both processing capacity and processing quality.

Further, since the boiler section and the superheat section are constructed in such a manner that they are integrated in the vertical tube group 12, the floor area required for installing the superheated steam generator 11 can be small. Also, 1
It suffices if the apparatus 11 is provided with one power supply 21 for supplying electric power to the induction coil 15 by simultaneously generating steam and overheating the steam with the induction coil 15. Therefore, the device price becomes low.

The amount v of superheated steam generated and its temperature T are determined by the water level θ of the water 13 stored in the pipe 12a.
And it is adjusted by the electric power P supplied from the power supply unit 21 to the induction coil 15. For this reason, the amount v of superheated steam generated and the temperature T thereof are conventionally controlled independently of the amount of steam in the boiler part and the temperature in the superheat part, but in the present embodiment, the water level θ in the pipe 12a and By adjusting the electric power P supplied to the induction coil 15, they are simultaneously controlled within the same tubular body 12a.

The superheated steam generator 1 of this embodiment is also used.
1 has a plurality of electrically conductive pipes 12a, so that the stored water 13 is dispersed in the plurality of pipes 12a, and the heat transfer distance between the water 13 and steam and the pipe 12a is short. And their contact area increases. Therefore, the heat supply from the heated pipe body 12a to the water 13 in the water retention zone and the steam in the space zone is larger than that in the case of one pipe body having a cross-sectional area equal to the total cross-sectional area of each pipe body 12a. Be done efficiently. Therefore, a large amount of high temperature superheated steam can be generated. Further, by supplying water from the water supply tank 14 to each of the pipes 12a to one relay chamber 12b connected to the lower end of each of the pipes 12a, all the pipes 12a can be simultaneously supplied. For this reason, the water supply from the water supply tank 14 to each pipe 12a is facilitated.

Since each tube 12a is non-magnetic,
The AC magnetic field generated by the energization of the induction coil 15 extends to the tubular body 12a in the depth direction of the plurality of tubular bodies 12a, which are attenuated and extend to a small extent. For this reason,
An induced current is evenly generated in all of the plurality of conductive tubes 12a, and the superheated steam is output with a stable amount and temperature.

The superheated steam generator 1 of this embodiment is also used.
In No. 1, by raising or lowering the ground water level of the water supply tank 14 by the water supply section water level adjusting mechanism, the water level of the water retention zone in the pipe body 12a, which is in balance with the atmospheric pressure as in the water supply tank 14, also changes. Therefore, the water level of the water retention zone in the pipe body 12a can be easily adjusted to an arbitrary water level by adjusting the water level of the water supply tank 14 provided outside the pipe body 12a. The generated amount v and the temperature T can be easily adjusted.

The superheated steam generator 1 of this embodiment is also used.
1, the induction coil 15 is composed of a hollow copper pipe, and the water 13 stored in the water supply tank 14 is supplied to the pipe body 12a via the copper pipe. Therefore, the induction coil 15 that has generated heat due to the application of the high-frequency current is cooled by the water 13 in the pipe, and
The water 13 that has taken heat from the pipe body 12a is supplied to the pipe body 1
The heating efficiency of the water 13 in 2a improves.

The superheated steam generator 1 of this embodiment is also used.
In No. 1, since the induction coil 15 has a two-layer winding around the outside of the water-holding zone of the pipe body 12a, the induction coil portion around the outside is more than the induction coil portion outside the space zone of the pipe body 12a. Generates a strong AC magnetic field. Therefore, a larger induced current is generated in the tube body 12a in the water retention zone than in the tube body 12a in the space zone, and a large amount of heat energy is generated. Therefore, more heat energy is supplied to the water retention zone that requires more heat energy to convert the water 13 into steam, and a space that requires less heat energy to convert steam into superheated steam. The corresponding thermal energy is supplied to the zone. As a result, necessary and sufficient heat energy is supplied to each zone, and the electric power energy supplied to the induction coil 15 is suppressed to a necessary minimum to provide the superheated steam generator 11 capable of saving energy. .

Here, the induction coil 15 around the outside of the water-holding zone of the tubular body 12a is wound in multiple layers, in the present embodiment, is formed into two layers. Even if the winding interval is made coarser toward the vertically upper side, the same action and effect as the above can be obtained.

Further, the superheated steam generator 1 of this embodiment
1 includes the first heat insulating material 16 between the induction coil 15 and the tube group 12, so that each tube body 12a is shielded from the atmosphere around the outside, and the heat in each tube body 12a escapes to the outside. Can be prevented. Therefore, the inside of each tube 12a is not affected by the temperature fluctuation of the atmosphere around the outside, and is maintained at the temperature set by the induction current by the induction coil 15, and the temperature controllability thereof is improved. In addition, at this time, the second heat insulating material 17 arranged around the outer periphery of the induction coil 15 prevents heat radiation together with the first heat insulating material 16 and enhances thermal efficiency.

Next, a superheated steam generator according to another embodiment of the present invention will be described.

In the superheated steam generator according to the present embodiment, the conductive and non-magnetic tubular body 12a of the above-described embodiment is provided in the cylindrical body which is erected in the vertical direction and in which the water 13 is stored inside the hollow.
Instead of this, a non-conductive and non-magnetic tubular body 12a 'such as alumina whose longitudinal section is shown in FIG. 6 (a) and whose plane is shown in FIG. 6 (b) is used. A conductive material 41 is provided in the tubular body 12a 'over substantially the entire length inside the hollow. Material 41
Consists of a corrugated plate that is bent in a zigzag manner, and in addition to its function as an induction heating element, it disturbs the flow of water 13 in the water retention zone in the tube 12a 'and the steam in the space zone above it. In the body group 12, the heat transfer coefficient between the water 41 in the water retention zone and the water vapor in the space zone and the material 41 is improved, and the heating efficiency is increased. The material 41 is not limited to such a corrugated plate, and a conductive metal chain or the like may be provided over substantially the entire length inside the hollow of the tubular body 12a '.

Other configurations of the superheated steam generator according to the present embodiment are the same as those of the superheated steam generator 11 of the above-described embodiment except for this.

In the superheated steam generator of this embodiment having this structure, the AC magnetic flux generated by passing the high frequency current through the induction coil 15 causes the non-conducting tubes 1
The conductive material 41 disposed in 2a extends to the material 41
An induced current flows through the material 41, and the material 41 is heated over its entire length by its Joule heat. Therefore, the water 13 in the water retention zone becomes steam not exceeding 100 ° C. and advances to the space zone above it, and this steam is further heated while passing through the space zone and becomes superheated steam exceeding 100 ° C. to be output. To be done.

Therefore, also in the superheated steam generator according to this embodiment, the boiler section for generating steam and the superheat section for generating superheated steam are constituted by the vertical tube group 12, and the first embodiment is used. Superheated steam generator 11
The same action and effect as.

In addition, in the first embodiment using the conductive and non-magnetic tube body 12a shown in FIG. 4, each tube body 1
You may make it the structure provided with the material similar to the above-mentioned material 41, such as a zigzag board, in 2a. According to this configuration, this material has the effect of improving the heat transfer by disturbing the flow of the water 13 and the steam in the pipe 12a, and thus the water 13 in the pipe 12a is improved.
The heating efficiency of steam and steam is further improved. In this case, the zigzag plate or the like may be conductive or non-conductive (even if conductive, almost no induced current is generated due to the shielding effect of the conductive tube 12a), but the magnetic field From the viewpoint of achieving the following, it is desirable that the material is non-magnetic.

[0060]

As described above, according to the present invention, due to the heat generation of the electrically conductive cylinder or material, the water in the water retention zone becomes water vapor not exceeding 100 ° C. and advances to the upper space zone, This steam is further superheated while passing through the space zone and becomes superheated steam exceeding 100 ° C. and is output. The generation amount and temperature of the superheated steam thus output can be controlled simply by adjusting only the power supplied to the induction coil and the water level in the water retention zone. In addition, the boiler part that generates steam and the superheat part that generates superheated steam are integrally configured by a vertical cylinder, and the mist generated in the boiler part does not occur without irregular appearance and stay of the drain. Is dried in the overheated part of. Therefore, the superheated steam quickly reaches the desired set temperature and does not lose heat as in the conventional case on the way, so that the generation efficiency of the superheated steam is improved and the required electric power is also saved. Moreover, since the boiler part and the superheat part are configured in a form of being integrated in a vertical cylinder, the floor area required for installing the superheated steam generator can be small. Further, it suffices that one induction coil can simultaneously generate steam and overheat steam, and that the apparatus be provided with one power supply for supplying power to this induction coil. Therefore, the device price becomes low. Further, with respect to the amount and temperature of superheated steam, conventionally, the amount of steam was controlled independently in the boiler part, and the temperature was controlled independently in the superheat part. Are controlled simultaneously in the same cylindrical body by adjusting.

In addition, a plurality of conductive cylinders or non-conductive cylinders in which conductive materials are arranged are arranged, and at the lower end of this cylinder group, inside the hollow of each cylinder. When the connecting relay chamber is provided, the stored water is dispersed in the plurality of cylinders, the heat transfer distance is shortened, and the contact area is increased. Therefore, the heat supply from the conductive cylinder or the conductive material to the water in the water retention zone and the steam in the space zone is performed more efficiently than in the case where there is only one cylinder. Therefore, a large amount of high temperature superheated steam can be generated. Further, since water can be supplied from the water supply unit to each of the cylinders to one relay chamber connected to the lower end of each cylinder, the water can be supplied to all the cylinders at the same time. Is facilitated.

When a plurality of conductive cylinders or conductive materials and non-conductive cylinders are non-magnetic,
The alternating magnetic field generated by the energization of the induction coil is applied to the tubular body in the depth direction among the tubular bodies arranged in a plurality.
Attenuates less. Therefore, an induced current is evenly generated in all of the plurality of conductive cylinders or all of the plurality of conductive materials, and the superheated steam is output with a stable amount and temperature.

When the water level adjusting mechanism is a mechanism for adjusting the water level in the water retention zone by adjusting the water level above ground in the water supply unit, the water level above ground in the water supply unit provided outside the cylinder is adjusted. It is possible to easily adjust the water level to an arbitrary level, and it is possible to easily adjust the amount and temperature of superheated steam.

Further, the induction coil is made of a metal tube, and the water output from the water supply section is supplied to the water retention zone in a preheated state by cooling the induction coil through the hollow inside of the induction coil. With such a configuration, thermal efficiency is improved.

When the number of turns of the induction coil in the water retention zone is denser than in the space zone, the induction coil portion around the water retention zone has a stronger alternating current than the induction coil portion outside the space zone. Generates a magnetic field. Therefore,
A larger induced current is generated in the conductive cylinder or the conductive material in the water retention zone than in the conductive cylinder or the conductive material in the space zone, and a large amount of heat energy is generated. As a result, necessary and sufficient heat energy is supplied to each zone, and the electric energy supplied to the induction coil is suppressed to a necessary minimum to provide an overheated steam generator capable of saving energy.

Further, when a heat insulating material is provided between the induction coil and the cylinder, the heat insulating material can prevent the heat inside the cylinder from escaping to the outside by shielding the cylinder from the atmosphere of the outside. I can. Therefore, in addition to improving the thermal efficiency, the inside of the cylinder is kept at a temperature set by the induction current by the induction coil without being affected by the temperature fluctuation of the atmosphere around the cylinder, and the controllability of the temperature and the like is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a conventional superheated steam generator.

FIG. 2 is a diagram schematically showing a configuration of an overheated steam generator of the present invention.

FIG. 3 is a graph showing the relationship between the amount of superheated steam generated and the temperature in the superheated steam generator of the present invention.

FIG. 4A is a diagram schematically showing a superheated steam generator according to an embodiment of the present invention, and FIG. 4B is a circuit diagram of a power supply unit for supplying power to the superheated steam generator shown in FIG.

FIG. 5 is a cross-sectional view of a tube group that constitutes the superheated steam generator according to the embodiment of the present invention.

FIG. 6 (a) is a cross-sectional view of a tubular body that constitutes an overheated steam generator according to another embodiment of the present invention, and FIG. 6 (b) is a plan view thereof.

[Explanation of symbols]

11 ... Superheated steam generator 12 ... Tube group 12a ... tubular body 12b ... Relay room 12c ... Header for discharging superheated steam 13 ... water 14 ... Water tank 14a ... water supply port 15 ... Induction coil 15a ... One end of the induction coil 15 15b ... The other end of the induction coil 15 16, 17 ... Insulation material 41 ... Conductive material

Claims (7)

[Claims] 1. A conductive cylindrical body which stands vertically and uses the lower end side of the hollow interior as a water retention zone, or a non-conductive material in which a conductive material is provided over substantially the entire length of the hollow interior. , A water supply part for supplying water to the water retention zone, a water level adjusting mechanism for adjusting the water level of the water retention zone, and the water retention zone around the cylinder and above the water retention zone. A superheated steam generator comprising: an induction coil wound over a spatial zone. 2. A plurality of the conductive cylinders or non-conductive cylinders in which a conductive material is arranged are arranged, and a hollow of each cylinder is provided at the lower end of this cylinder group. A relay room connected to the inside is provided, water output from the water supply section is supplied to the water retention zone via the relay room, and the induction coil is provided around the comprehensive outer periphery of the cylinder group. The superheated steam generator according to claim 1, which is wound. 3. The superheated steam generator according to claim 2, wherein the conductive cylinder, or the conductive material and the non-conductive cylinder are non-magnetic. 4. The water level adjusting mechanism is a mechanism for adjusting the water level in the water retention zone by adjusting the ground water level of the water supply unit. The superheated steam generator according to the item. 5. The induction coil is made of a metal tube, and the water output from the water supply section passes through the hollow inside of the induction coil and is cooled by cooling the induction coil to retain the water. The superheated steam generator according to any one of claims 1 to 4, wherein the superheated steam generator is supplied to a water zone. 6. The superheated steam according to claim 1, wherein the induction coil has a higher number of turns in the water retention zone than in the space zone. Generator. 7. The superheated steam generator according to any one of claims 1 to 6, wherein a heat insulating material is provided between the induction coil and the cylindrical body.