JP2023162578A - Superheated steam generation device - Google Patents

Abstract

To effectively use radiation of heat from a superheated conductor tube to improve thermal efficiency and reduce the influence that the superheated conductor tube is cooled by water or steam introduced from an introduction port.SOLUTION: A pre-heating conductor tube 3 has a first pre-heating conductor tube 31 and a second pre-heating conductor tube 32 that are arranged concentrically around a closed magnetic circuit iron core 2. The conductor tubes 31, 32, 4 are arranged in the order of the second pre-heating conductor tube 32, a superheated conductor tube 4, and the first pre-heating conductor tube 31 from the inside in a radial direction, and are connected in series in the order of the first pre-heating conductor tube 31, the second pre-heating conductor tube 32, and the superheated conductor tube 4. The second pre-heating conductor tube 32 has a spiral short circuit part 32X short-circuited in an axial direction. A superheated steam generation device introduces water or steam from an introduction port P1 provided in the first pre-heating conductor tube 31, and derives superheated steam from a derivation port P2 provided in the superheated conductor tube 4 through the second pre-heating conductor tube 32.SELECTED DRAWING: Figure 1

Description

The present invention relates to a superheated steam generator.

As shown in Patent Document 1, a conventional superheated steam generation device uses a first conductor pipe and a second conductor pipe as the primary coil, and a secondary coil is provided between the first conductor pipe and the second conductor pipe. A device equipped with a third conductor pipe (overheating conductor pipe) has been considered. Specifically, the introduction port of the first conductor pipe through which water is introduced is provided at one end in the axial direction, and the outlet port of the third conductor pipe through which superheated steam is led out is provided at the other end in the axial direction. . Further, the second conductor tube and the third conductor tube are connected to each other at one end in the axial direction.

In this superheated steam generation device, the first conductor tube and the second conductor tube are heated by electricity and are heated using the heat radiation of the third conductor tube, so that the heat radiation from the third conductor tube to the outside of the device is reduced. can be reduced and thermal efficiency can be increased.

However, in the above configuration, one axial end of the third conductor tube is cooled by the water introduced from the introduction port of the first conductor tube, so the preheated water or steam flowing into the third conductor tube is cooled. It will be done. This poses a problem in that it takes a long time to heat the superheated steam to a desired temperature, and the temperature of the generated superheated steam changes as the amount of water changes.

JP 2021-34294 Publication

Therefore, the present invention has been made to solve the above problems, and improves thermal efficiency by effectively utilizing the heat dissipation of the superheated conductor pipe, and also cools the superheated conductor pipe with water or steam introduced from the introduction port. The main challenge is to reduce the impact of

That is, the superheated steam generation device according to the present invention is a superheated steam generation device that generates superheated steam by generating heat in a conductor tube by electromagnetic induction to heat water or steam flowing through the conductor tube, and which includes a closed magnetic circuit iron core and , a primary coil to which an alternating voltage is applied and a spiral preheating conductor tube arranged around the closed magnetic circuit core, and a secondary coil through which an induced current flows, which is arranged around the closed magnetic circuit core. a spiral superheating conductor pipe, the preheating conductor pipe having a first preheating conductor pipe and a second preheating conductor pipe arranged concentrically around the closed magnetic path iron core, each of the conductor pipes having a diameter The second preheating conductor pipe, the overheating conductor pipe, and the first preheating conductor pipe are arranged in this order from the inside in the direction, and the first preheating conductor pipe, the second preheating conductor pipe, and the overheating conductor pipe are arranged in series in this order. The second preheating conductor pipe has a spiral short-circuited part in the axial direction, and water or steam is introduced from an introduction port provided in the first preheating conductor pipe. , characterized in that superheated steam is led out from a lead-out port provided in the overheating conductor pipe via the second preheating conductor pipe.

According to such a superheated steam generation device, a first preheating conductor pipe and a second preheating conductor pipe are used as the primary coil, and a superheating coil, which is a secondary coil, is used between the first preheating conductor pipe and the second preheating conductor pipe. Since the conductor tube is provided, the first preheating conductor tube and the second preheating conductor tube are heated by electricity and are also heated using the heat radiation of the overheating conductor tube, reducing heat radiation from the overheating conductor tube to the outside of the device. It is possible to increase thermal efficiency.
Particularly, in the present invention, since the second preheating conductor pipe has a short-circuited portion short-circuited in the spiral axial direction, the preheated water or saturated steam flowing into the superheating conductor pipe is heated by Joule heat generation due to the short circuit current. It can be heated by As a result, the influence of cooling the superheated conductor pipe by water or steam introduced from the introduction port can be reduced, and the time required to heat the superheated steam to a desired temperature can be shortened. Further, in response to a change in the temperature of the superheated steam due to a change in the amount of water, the superheated steam can be heated to a desired temperature regardless of the change in the amount of water.
Here, the number of turns of the first preheating conductor tube and the second preheating conductor tube forming the primary coil, the current carrying cross-sectional area of the conductor tube, and the diameter of the communication hole of the conductor tube are determined to determine the heat generation ratio and heat transfer to the fluid. The area ratio and fluid flow rate ratio can be adjusted.
In addition, the first preheating conductor pipe, the second preheating conductor pipe, and the superheating conductor pipe are connected in series in this order, and water or steam is introduced from the introduction port provided in the first preheating conductor pipe, and the second preheating conductor pipe is connected to the second preheating conductor pipe. Since the superheated steam is led out from the outlet port provided in the superheated conductor pipe through the pipe, the superheated steam generation device can be simplified and downsized. Here, since the temperature of the water or saturated steam flowing into the superheated conductor pipe is made high by the short-circuit part, it is possible to shorten the length of the superheated conductor pipe, which also makes it possible to downsize the superheated steam generator. It becomes possible.

In order to make the effects of the present invention remarkable, the introduction port is provided at one axial end of the first preheating conductor tube, and the outlet port is provided at the other axial end of the superheating conductor tube. It is desirable that
With this configuration, since the introduction port and the outlet port are arranged on opposite sides in the axial direction, it is possible to reduce the influence of the temperature of the water introduced from the introduction port on the superheated steam extracted from the outlet port. . Although one axial end of the superheated conductor pipe is cooled by water introduced from the introduction port, water or saturated steam heated by the short circuit is introduced into the one axial end of the superheated conductor pipe, so the overheating time is This makes it possible to reduce the temperature of the superheated steam due to changes in the amount of water.

One axial end of the second preheating conductor tube and one axial end of the overheating conductor tube are connected, and the short circuit is provided on the one axial end side of the second preheating conductor tube. This is desirable.
With this configuration, the water or saturated steam flowing through the second preheating conductor tube can be heated by the short circuit immediately before it flows into one axial end of the superheating conductor tube, so that the heating effect by the short circuit can be made more pronounced. can.

The overheating conductor tube includes a first overheating conductor tube and a second overheating conductor tube, which are arranged concentrically around the closed magnetic circuit iron core and spirally wound in opposite directions to each other, and the first overheating conductor tube. and a connecting pipe element that fluidly connects one axial end of the second overheating conductor pipe and the other axial end of the second overheating conductor pipe and short-circuits them.
With this configuration, there is no need to provide an electrical connection member separately from the conductor tube, and a short circuit can be formed by the configuration of the conductor tube itself. Furthermore, the connecting pipe element is configured to connect one axial end of each pipe element and connect the other axial end of each pipe element to each other, so that the connection structure for forming a short circuit can be simplified.

According to the present invention configured in this way, it is possible to effectively utilize the heat dissipation of the overheated conductor pipe to improve thermal efficiency, and to reduce the effect of cooling the overheated conductor pipe by water or steam introduced from the introduction port. .

1 is a cross-sectional view schematically showing the configuration of a fluid heating device according to an embodiment of the present invention. It is a figure which shows typically the arrangement|positioning in the radial direction of the fluid heating device of the same embodiment. It is a figure showing the composition of the closed magnetic circuit iron core of the same embodiment. It is a side view which shows typically the structure of the overheating conductor tube (1st overheating conductor tube and 2nd overheating conductor tube) of the same embodiment. It is a figure which shows the coil connection and the flow of the fluid of the same embodiment.

EMBODIMENT OF THE INVENTION Below, one Embodiment of the superheated steam generation apparatus based on this invention is described with reference to drawings.

<1. Device configuration>
The superheated steam generation device 100 according to the present embodiment generates superheated steam by causing a conductor tube to generate heat by electromagnetic induction to heat water flowing through the conductor tube. In addition, the superheated steam generation device 100 may be one that generates superheated steam by heating saturated steam generated externally, for example.

Specifically, as shown in FIGS. 1 and 2, the superheated steam generation device 100 includes a closed magnetic circuit core 2, a primary coil to which an alternating current voltage is applied, and a spiral ( A coil-shaped preheating conductor tube 3 and a spiral (coil-shaped) overheating conductor tube 4 which is a secondary coil through which an induced current flows and are arranged around the closed magnetic circuit iron core 2 are provided.

As particularly shown in FIG. 3, the closed magnetic circuit core 2 has two rectangular annular core elements 21 and 22, and the leg core portions 21a and 22a of the two core elements 21 and 22 are combined so as to be in close contact with each other. It is composed of The two core elements 21 and 22 have the same shape, and each core element 21 and 22 is a rectangular annular structure made by laminating magnetic steel plates such that the width decreases from the outside to the inside. This is a wound core that has been transformed into. Note that grain-oriented electrical steel sheets are used as the magnetic steel sheets. By using these core elements 21 and 22, the cross-sectional shape of the closed magnetic circuit core 2 becomes a multi-stage shape.

The preheating conductor tube 3 includes a first preheating conductor tube 31 and a second preheating conductor tube 32 that are arranged concentrically around the closed magnetic circuit iron core 2 . These first preheating conductor tube 31 and second preheating conductor tube 32 are spirally wound.

The first and second preheating conductor tubes 31 and 32 are each wound in a single layer, with the first preheating conductor tube 31 being disposed on the outermost side in the radial direction, and the second preheating conductor tube 32 being disposed on the innermost side in the radial direction. There is.

An introduction port P1 is provided at one axial end of the first preheating conductor tube 31, and the other axial end of the first preheating conductor tube 31 is connected to the other axial end of the second preheating conductor tube 32. There is. Further, one axial end of the second preheating conductor tube 32 is connected to one axial end of the overheating conductor tube 4 .

Note that a flow rate adjustment valve 5 for adjusting the flow rate of water flowing into the first preheating conductor pipe 31 is provided at or near the introduction port P1. Furthermore, an AC power source (not shown) that applies an AC voltage is connected to a power supply terminal 61 provided at one axial end of the first preheating conductor tube 31 and a power supply terminal 61 provided at one axial end of the second preheating conductor tube 32. It is connected to terminal 62.

The first preheating conductor tube 31 is configured so that the wound portions of the conductor tube 31 are not short-circuited to each other. Note that the winding portion refers to one spiral turn. Specifically, the conductor tube 31 is wound with a gap so that the outer circumferential surfaces of the respective winding portions do not come into contact with each other, thereby preventing the wound portions of the conductor tube 31 from shorting each other. There is. In addition, the first preheating conductor tube 31 may be configured to be subjected to an insulation treatment such as wrapping an insulator (not shown) around its outer peripheral surface so that the wound portions do not short-circuit with each other. .

Further, as shown in FIG. 1, the second preheating conductor tube 32 has a short circuit portion 32X in which the wound portions of the conductor tube 32 are shorted to each other. Note that the winding portions of the second preheating conductor tube 32 other than the short-circuit portion 32X are configured so as not to short-circuit with each other. In addition, the wound portions of the second preheating conductor tube 32 other than the short-circuit portion 32X are insulated by wrapping an insulator (not shown) around the outer circumferential surface of the wound portions to prevent short-circuiting. It may be configured.

Specifically, the short-circuit portion 32X is configured by short-circuiting the wound portion of the conductor tube 32 in the spiral axial direction. Here, the short-circuit portion 32X may be constructed by connecting the wound portions of the conductor tube 32 by joining such as welding, or may be configured by connecting the wound portions of the conductor tube 32 to each other by joining the wound portions together, or by connecting the electrical connection member that spans the wound portions to each of the wound portions. The structure may also be configured by connecting them by joining such as welding. Further, the short circuit portion 32X is configured by short circuiting two or more winding portions. Further, the short-circuit portion 32X is provided at one end in the axial direction of the second preheating conductor tube 32. In this embodiment, the short-circuit portion 32X is formed so as to include the outermost winding portion of the second preheating conductor tube 32 at one end in the axial direction.

As shown in FIG. 4, the overheating conductor pipe 4 includes a first overheating conductor pipe 41 and a second overheating conductor pipe 42 that are spirally wound in opposite directions, and a first overheating conductor pipe 41 and a second overheating conductor pipe 42. It has first and second connecting pipe elements 43 and 44 that fluidly connect one axial end of the pipe 42 and the other axial end of the pipe 42 and short-circuit them. A gap is formed in the first overheating conductor pipe 41 and the second overheating conductor pipe 42 in the radial direction when viewed from the axial direction.

The first overheating conductor pipe 41 and the second overheating conductor pipe 42 are arranged between the first preheating conductor pipe 31 and the second preheating conductor pipe 32. Further, one axial end of the overheating conductor tube 4 is connected to one axial end of the second preheating conductor tube 32, and the other axial end of the overheating conductor tube 4 is provided with an outlet port P2. Note that a temperature sensor 7 for controlling the temperature of superheated steam is provided at or near the outlet port P2.

With such a configuration, each of the conductor pipes 31, 32, 41, and 42 is connected to the second preheating conductor pipe 32, the second overheating conductor pipe 42, the first overheating conductor pipe 41, and the first preheating conductor pipe 31 from the inside in the radial direction. The first preheating conductor pipe 31, the second preheating conductor pipe 32, and the overheating conductor pipe 4 are connected in series in this order.

Further, one axial end portion of the second preheating conductor tube 32 is connected to the first connecting tube element 43, and the second connecting tube element 44 is provided with an outlet port P2. With this configuration, the fluid flowing in from the first connecting pipe element 43 branches into the first overheating conductor pipe 41 and the second overheating conductor pipe 42 and flows through the first overheating conductor pipe 41 and the second overheating conductor pipe 42. The fluids flowing through the conductor pipe 42 join together at the second connecting pipe element 44 and flow out from the outlet port P2.

Moreover, the overheating conductor pipe 4 connected in this way has a configuration in which the first overheating conductor pipe 41 and the second overheating conductor pipe 42 are electrically connected in parallel by connecting pipe elements 43 and 44. A closed circuit is formed by the first overheating conductor tube 41 and the second overheating conductor tube 42 due to the magnetic flux generated by the first and second preheating conductor tubes 31 and 32, which are the primary coils, and a short circuit current flows. In other words, a short-circuit current flows through the first overheating conductor tube 41 from one axial end to the other axial end, and through the second overheating conductor tube 42 from the other axial end toward the other axial end. short circuit current flows.

Moreover, in the superheated steam generation device 100 of this embodiment, as shown in FIGS. 1 and 2, between the first preheating conductor pipe 31 and the first overheating conductor pipe 41, the first A heat insulating material 8 is filled between the conductor pipe 42 and between the second overheating conductor pipe 42 and the second preheating conductor pipe 32. This heat insulating material 8 is also filled in the gaps between the wound portions of each of the preheating conductor tubes 31 and 32, and is also filled in the gaps between the wound portions of each of the superheating conductor tubes 41 and 42. In this embodiment, a casing 9 is provided around the outer periphery of the first preheating conductor pipe 31 , and a heat insulating material 8 is provided between the first preheating conductor pipe 31 and the casing 9 . Alternatively, a heat insulating material 8 may be filled between the leg core portions 21a, 22a of the closed magnetic circuit core 2 and the second preheating conductor pipe 32.

In the superheated steam generation device 100 of this embodiment configured in this way, an AC voltage is applied to the power supply terminal 61 provided on the first preheating conductor pipe 31 and the power supply terminal 62 provided on the second preheating conductor pipe 32 from an AC power supply. By applying the voltage, alternating current flows through the first and second preheating conductor tubes 31 and 32, and magnetic flux flows through the closed magnetic circuit iron core 2. Due to the magnetic flux, a short circuit current flows through the first overheating conductor pipe 41, the second overheating conductor pipe 42, and the connecting pipe elements 43, 44, and the overheating conductor pipe 4 generates Joule heat. Further, the first and second preheating conductor tubes 31 and 32 generate Joule heat when energized by applying an alternating current voltage, and are heated by heat transfer from the overheating conductor tube 4. Further, in the second preheating conductor tube 32, a short circuit current flows through the short circuit portion 32X, and the second preheating conductor tube 32 is heated to a higher temperature than other parts of the second preheating conductor tube 32.

As a result, as shown in FIG. It is heated by the pipes 31 and 32 to become high temperature water or saturated steam. In addition, immediately before flowing into the overheating conductor pipe 4, it is further heated by the short circuit portion 32X of the second preheating conductor pipe 32. Thereafter, the high temperature water or saturated steam that has flowed into the overheating conductor tube 4 from the second preheating conductor tube 32 is heated by the overheating conductor tube 4 to become superheated steam, and is led out from the outlet port P2.

<2. Effects of this embodiment>
According to the superheated steam generation device 100 configured in this way, the first preheating conductor pipe 31 and the second preheating conductor pipe 32 are used as the primary coil, and the space between the first preheating conductor pipe 31 and the second preheating conductor pipe 32 is Since the overheating conductor tube 4, which is a secondary coil, is provided in Heat radiation from the conductor tube 4 to the outside of the device can be reduced, and thermal efficiency can be increased.

In particular, in this embodiment, since the second preheating conductor pipe 32 has a spiral short-circuit part 32X short-circuited in the axial direction, the preheated water or saturated steam flowing into the superheating conductor pipe 4 is short-circuited. Further heating can be achieved by Joule heat generation caused by the current. As a result, the influence of cooling the superheated conductor pipe 4 by the water or steam introduced from the introduction port P1 can be reduced, and the time required to heat the superheated steam to a desired temperature can be shortened. Further, in response to a change in the temperature of the superheated steam due to a change in the amount of water, the superheated steam can be heated to a desired temperature regardless of the change in the amount of water.

Here, the first preheating conductor tube 31 and the second preheating conductor tube 32 that form the primary coil have heat generation ratio and fluid flow depending on the number of turns, current carrying cross-sectional area of the conductor tube, and communication hole diameter of the conductor tube. Heat transfer area ratio and fluid flow rate ratio can be adjusted.

Further, the first preheating conductor pipe 31, the second preheating conductor pipe 32, and the superheating conductor pipe 4 are connected in series in this order, and water or steam is introduced from the introduction port P1 provided in the first preheating conductor pipe 31. , superheated steam is led out from the outlet port P2 provided in the superheated conductor pipe 4 via the second preheated conductor pipe 32 and the third preheated conductor pipe 33, thereby simplifying and downsizing the superheated steam generating device 100. Can be done. Here, since the temperature of the water or saturated steam flowing into the superheated conductor pipe 4 is made high by the short circuit part 32X, it is possible to shorten the length of the superheated conductor pipe 4, and this also allows the superheated steam generator 100 to can be made smaller.

Furthermore, since the overheating conductor pipe 4 is composed of the first overheating conductor pipe 41, the second overheating conductor pipe 42, and the connecting pipe elements 43, 44, there is no need to provide an electrical connection member separately from the conductor pipe, and the conductor A short circuit can be created by the configuration of the tube itself. In addition, the connecting pipe elements 43 and 44 connect one axial end of each of the overheating conductor pipes 41 and 42 and connect the other axial ends to each other, simplifying the connection structure for forming a short circuit. It can be done. Moreover, since the overheating conductor tube 4 has the first overheating conductor tube 41 and the second overheating conductor tube 42, the contact area with the fluid (heat exchange area) can be increased, and the heating efficiency of the fluid can be improved. can.

By using the overheating conductor tube 4 as a secondary coil with multiple turns, the excitation current can be reduced and the leakage impedance can be reduced, so the cross-sectional area of the closed magnetic circuit iron core 2 can be reduced, the amount of iron core used can be reduced, and iron loss can be reduced. can be reduced and thermal efficiency can be increased. Further, since the closed magnetic circuit iron core 2 is formed into a multi-stage shape to increase the surface area of the iron core, the cooling effect can be increased.

<3. Modified embodiments of the present invention>
Note that the present invention is not limited to the above embodiments.
For example, in the embodiment, the first and second preheating conductor tubes 31 and 32 are each wound in a single layer, but at least one of the first and second preheating conductor tubes 31 and 32 is wound in two or more layers. It may be of.

Further, in the embodiment, the winding directions of the first overheating conductor pipe 41 and the second overheating conductor pipe 42 were opposite to each other, but the winding direction of the first overheating conductor pipe 41 and the second overheating conductor pipe 42 was may be in the same direction. In this case, one axial end of the first overheating conductor pipe 41 and the other axial end of the second overheating conductor pipe 42 are connected by the connecting pipe element 43, and the other axial end of the first overheating conductor pipe 41 and one axial end of the second overheating conductor pipe 42 are connected by a connecting pipe element 44.

Further, although the superheating conductor pipe 4 in the embodiment described above has a double pipe structure, it may have a quadruple pipe structure or an even number of pipe elements. In this case, every two pipe elements are connected by a connecting pipe element. For example, it is conceivable that a plurality of the overheating conductor tubes 4 of the above embodiment are arranged concentrically.

Furthermore, the embodiments are applicable not only to single-phase AC systems but also to three-phase AC systems.

In addition, it goes without saying that the present invention is not limited to the embodiments described above, and that various modifications can be made without departing from the spirit thereof.

100... Superheated steam generation device 2... Closed magnetic path iron cores 21, 22... Iron core elements 21a, 22a... Leg core portion 3... Preheating conductor tube 31... First preheating conductor tube 32. ...Second preheating conductor pipe 32X...Short circuit portion 4...Overheating conductor pipe 41...First overheating conductor pipe 42...Second overheating conductor pipe 43, 44...Connecting pipe element P1...・Introduction port P2...Output port 8...Insulation material

Claims (4)

A superheated steam generation device that generates superheated steam by generating heat in a conductor tube by electromagnetic induction to heat water or steam flowing through the conductor tube,
A closed magnetic circuit iron core,
a spiral preheating conductor tube which is a primary coil to which an alternating current voltage is applied and is arranged around the closed magnetic circuit core;
A secondary coil through which an induced current flows, and includes a spiral superheated conductor tube arranged around the closed magnetic path iron core,
The preheating conductor tube has a first preheating conductor tube and a second preheating conductor tube arranged concentrically around the closed magnetic path iron core,
The respective conductor pipes are arranged in the order of the second preheating conductor pipe, the overheating conductor pipe, and the first preheating conductor pipe from the inside in the radial direction, and the first preheating conductor pipe, the second preheating conductor pipe, and the superheating conductor pipe. The conductor tubes are connected in series,
The second preheating conductor tube has a spiral short-circuited portion in the axial direction,
Superheated steam, in which water or steam is introduced from an introduction port provided in the first preheating conductor pipe, and superheated steam is led out from an outlet port provided in the superheating conductor pipe via the second preheating conductor pipe. generator. The introduction port is provided at one axial end of the first preheating conductor tube,
The superheated steam generation device according to claim 1, wherein the outlet port is provided at the other axial end of the superheated conductor pipe. One axial end of the second preheating conductor tube and one axial end of the overheating conductor tube are connected,
The superheated steam generation device according to claim 1 or 2, wherein the short-circuit portion is provided on one axial end side of the second preheating conductor pipe. The overheating conductor tube includes a first overheating conductor tube and a second overheating conductor tube, which are arranged concentrically around the closed magnetic circuit iron core and spirally wound in opposite directions to each other, and the first overheating conductor tube. and a connecting pipe element that fluidly connects one axial end of the second overheating conductor pipe and the other axial end of the second overheating conductor pipe and short-circuits them. Device.