JP2023067382A - Superheated steam generator - Google Patents

Abstract

To enable simplification and miniaturization of a super heated steam generator while increasing thermal efficiency.SOLUTION: A superheated steam generator comprises: a closed magnetic path core 2; a spiral preheat conductor pipe 3 serving as a primary coil to which an alternative current voltage is applied, and disposed around the closed magnetic path core 2; and a spiral superheat conductor pipe 4 serving as a secondary coil through which an induction current flows, and disposed around the closed magnetic path core 2; the preheat conductor pipe 3 comprising a first preheat conductor tube 31, a second preheat conductor tube 32, and a third preheat conductor tube 33 that are concentrically disposed around the closed magnetic path core 2, the superheat conductor pipe 4 comprising a first superheat conductor tube 41 and a second superheat conductor tube 42 that are concentrically disposed around the closed magnetic path core 2 and that are spirally wound in mutually opposite directions, for conductor tubes 31 to 33, and 41, 42, from the inside in a radial direction, the second preheat conductor tube 32, the second superheat conductor tube 42, the third preheat conductor tube 33, the first superheat conductor tube 41, and the first preheat conductor tube 31 being arranged in this order.SELECTED DRAWING: Figure 1

Description

The present invention relates to a superheated steam generator.

As a conventional superheated steam generator, as shown in Patent Document 1, a first conductor pipe and a second conductor pipe are used as a primary coil, and a secondary coil is provided between the first conductor pipe and the second conductor pipe. A third conductor tube (superheating conductor tube) is provided. In this superheated steam generator, the first conductor pipe and the second conductor pipe are electrically heated and heated by utilizing the heat radiation of the third conductor pipe. can be reduced and thermal efficiency can be increased.

In this superheated steam generator, the third conductor tube has an inner tube element and an outer tube element spirally wound in opposite directions, and one axial end portion of the inner tube element and the outer tube element It is configured such that the two ends are fluidly connected and short-circuited by connecting pipe elements.

However, in the superheated steam generator described above, heat radiation from the radially outer side of the third conductor tube is used to heat the first conductor tube, and heat radiation from the radially inner side of the third conductor tube is used to heat the second conductor tube. Although it can be done, the heat dissipation between the inner tube element and the outer tube element of the third conductor tube cannot be effectively utilized.

JP 2021-34294 A

Therefore, the present invention has been made to solve the above problems, and it is intended to improve thermal efficiency by effectively utilizing the heat radiation of the superheating conductor tube, and to enable simplification and miniaturization of the superheated steam generator. is the main issue.

That is, the superheated steam generator according to the present invention is a superheated steam generator that generates superheated steam by generating heat in a conductor tube by electromagnetic induction and heating water or steam flowing through the conductor tube to generate superheated steam. , a primary coil to which an alternating voltage is applied, a helical preheating conductor tube arranged around the closed magnetic circuit core, and a secondary coil through which an induced current flows, arranged around the closed magnetic circuit core a helical overheating conductor tube, the preheating conductor tube having a first preheating conductor tube, a second preheating conductor tube, and a third preheating conductor tube concentrically arranged around the closed magnetic circuit core; The overheating conductor tube includes a first overheating conductor tube and a second overheating conductor tube that are arranged concentrically around the closed magnetic circuit core and spirally wound in opposite directions to each other, and the first overheating conductor tube. and a connection pipe element for fluidly connecting one axial end portions and the other axial end portions of the second superheating conductor pipes and short-circuiting them, wherein each of the conductor pipes is connected from the radially inner side to the The second preheating conductor tube, the second overheating conductor tube, the third preheating conductor tube, the first overheating conductor tube and the first preheating conductor tube are arranged in this order, and the first preheating conductor tube and the second preheating conductor tube are arranged in this order. The preheating conductor tube, the third preheating conductor tube, and the superheating conductor tube are connected in series in this order, and water or steam is introduced from an introduction port provided in the first preheating conductor tube to supply the second preheating conductor. The superheated steam is led out from an outlet port provided in the superheating conductor pipe through the pipe and the third preheating conductor pipe.

According to such a superheated steam generator, the first preheating conductor pipe and the second preheating conductor pipe are used as the primary coil, and the secondary coil is between the first preheating conductor pipe and the second preheating conductor pipe. Since a certain overheating conductor tube is provided, the first preheating conductor tube and the second preheating conductor tube are electrically heated and heated by utilizing the heat radiation of the overheating conductor tube, so the heat from the overheating conductor tube to the outside of the apparatus heat dissipation can be reduced, and thermal efficiency can be increased.
In particular, in the present invention, the third preheating conductor tube is provided as the primary coil, and the third preheating conductor tube is provided between the first overheating conductor tube and the second overheating conductor tube of the overheating conductor tube. It is heated by effectively utilizing the heat radiation between the first overheating conductor tube and the second overheating conductor tube, and the thermal efficiency can be further increased.
Here, the first preheating conductor tube, the second preheating conductor tube, and the third preheating conductor tube that form the primary coil are set by setting the number of turns, the current-carrying cross-sectional area of the conductor tube, and the flow hole diameter of the conductor tube. , the area ratio of heat transfer to the fluid, and the flow velocity ratio of the fluid can be adjusted.
In addition, the first preheating conductor pipe, the second preheating conductor pipe, the third 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. Since the superheated steam is led out from the lead-out port provided in the superheating conductor pipe through the second preheating conductor pipe and the third preheating conductor pipe, the superheated steam generator can be simplified and downsized.
Furthermore, since the superheating conductor tube is composed of the first superheating conductor tube, the second superheating conductor tube, and the connection tube element, there is no need to provide an electrical connection member separately from the conductor tube, and the configuration of the conductor tube itself eliminates the short circuit. A circuit can be formed. In addition, the connection pipe element connects the axial ends of each pipe element to each other and connects the other axial ends to each other, which simplifies the connection structure for forming a short circuit.

In the superheating conductor tube, the outlet port side becomes the hottest, and the heat radiation from this part is the largest. In order to make effective use of heat radiation from the lead-out port side, the lead-out port is formed at one axial end of the overheating conductor pipe, and the third preheating conductor pipe extends axially on the same side as the lead-out port. Water or steam is preferably introduced from one end.
With this configuration, the relatively low-temperature water or steam flowing into the third heat conductor pipe can be efficiently preheated.

Further, in order to efficiently preheat water or steam flowing into the introduction port, it is desirable that the introduction port is formed at one end in the axial direction on the same side as the outlet port in the first preheating conductor pipe. .

In order to prevent the heat radiation from the overheating conductor tube from leaking to the outside of the device and to safely realize the heating of each preheating conductor tube by the heat radiation from the overheating conductor tube, between the first preheating conductor tube and the first overheating conductor tube, Between the first overheating conductor tube and the third preheating conductor tube, between the third preheating conductor tube and the second overheating conductor tube, and between the second overheating conductor tube and the second preheating conductor tube It is desirable that a heat insulating material is filled between
With this configuration, the thickness of the heat insulating material between the first preheating conductor tube and the first overheating conductor tube, the thickness of the heat insulating material between the second preheating conductor tube and the second overheating conductor tube, and the third Depending on the thickness of the heat insulating material between the preheating conductor pipe and the first and second overheating conductor pipes, the distance from the first and second overheating conductor pipes to the first preheating conductor pipe, the second preheating conductor pipe and the third preheating conductor pipe The heat transfer ratio can be adjusted.

As a specific connection configuration of each pipe, the first preheating conductor pipe, the second preheating conductor pipe, and the third preheating conductor pipe are single-layer wound, and at one end in the axial direction of the first preheating conductor pipe The introduction port is formed, the other axial end of the first preheating conductor pipe is connected to the other axial end of the second preheating conductor pipe, and the one axial end of the second preheating conductor pipe is connected to the other axial end of the second preheating conductor pipe. is connected to one axial end of the third preheating conductor tube.
In this configuration, it is preferable that an AC power supply that applies the AC voltage is connected to one axial end of the first preheating conductor tube and the other axial end of the third preheating conductor tube.

According to the present invention configured as described above, it is possible to improve the thermal efficiency and to reduce the size of the superheated steam generator.

It is a sectional view showing typically composition of a fluid heating device concerning one embodiment of the present invention. It is a figure which shows typically the arrangement|positioning in the radial direction of the fluid heating apparatus of the same embodiment. It is a figure which shows the structure 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 pipe (1st overheating conductor pipe and 2nd overheating conductor pipe) of the same embodiment. It is a figure which shows the coil connection and the flow of the fluid of the same embodiment.

An embodiment of a superheated steam generator according to the present invention will be described below with reference to the drawings.

<1. Device configuration>
The superheated steam generator 100 according to the present embodiment heats a conductor pipe by electromagnetic induction, heats water flowing through the conductor pipe, and generates superheated steam. In addition, the superheated steam generator 100 may be, for example, one that heats saturated steam generated outside to generate superheated steam.

Specifically, as shown in FIGS. 1 and 2, the superheated steam generator 100 is a closed magnetic circuit core 2 and a primary coil to which an alternating 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 is arranged around the closed magnetic circuit core 2 .

As particularly shown in FIG. 3, the closed magnetic circuit core 2 has two rectangular ring-shaped 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. configured as follows. The two core elements 21 and 22 have the same shape, and each core element 21 and 22 is a rectangular ring formed by laminating magnetic steel plates so that the width decreases from the outside to the inside. This is a wound core deformed into A grain-oriented magnetic steel sheet is used as the magnetic steel sheet. 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 has a first preheating conductor tube 31 , a second preheating conductor tube 32 , and a third preheating conductor tube 33 concentrically arranged around the closed magnetic circuit core 2 .

The first to third preheating conductor pipes 31, 32, and 33 are each wound in a single layer, with the first preheating conductor pipe 31 arranged radially outermost and the second preheating conductor pipe 32 arranged radially innermost. A third preheating conductor tube 33 is arranged between the first preheating conductor tube 31 and the second preheating conductor tube 32 .

An introduction port P1 is provided at one axial end of the first preheating conductor pipe 31, and the other axial end of the first preheating conductor pipe 31 is connected to the other axial end of the second preheating conductor pipe 32. there is One axial end of the second preheating conductor pipe 32 is connected to one axial end of the third preheating conductor pipe 33 .

A flow control 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 supply (not shown) that applies an AC voltage is provided at the feed terminal 61 provided at one axial end of the first preheating conductor tube 31 and at the other axial end of the third preheating conductor tube 33. It is connected to the power supply terminal 62 .

The first to third preheating conductor tubes 31, 32, 33 are configured so that the wound portions of the respective conductor tubes 31, 32, 33 are not short-circuited with each other. In addition, a winding part is a spiral 1 winding part. Specifically, the conductor tubes 31 to 33 are wound with gaps so that the outer peripheral surfaces of the respective winding parts do not contact each other, so that the winding parts of the conductor tubes 31 to 33 are short-circuited with each other. configured not to. In addition, each of the conductor tubes 31 to 33 is subjected to an insulating treatment such as being wrapped with an insulator (not shown) on its outer peripheral surface, so that the wound portions of the conductor tubes 31 to 33 are not short-circuited with each other. may be configured to

As shown in FIG. 4, the overheating conductor tube 4 includes a first overheating conductor tube 41 and a second overheating conductor tube 42 spirally wound in opposite directions, and a first overheating conductor tube 41 and a second overheating conductor tube 42 . It has connection pipe elements 43 and 44 that fluidly connect one axial end portions of the pipe 42 and the other axial end portions thereof and short-circuit them. A gap is formed between 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, and the first overheating conductor pipe 41 and the second overheating conductor pipe 42 A third preheating conductor pipe 33 is arranged between them. The other axial end of the superheating conductor tube 4 is connected to the other axial end of the third preheating conductor tube 33 , and the one axial end of the overheating conductor tube 4 is provided with a lead-out port P2. A temperature sensor 7 for controlling the temperature of the superheated steam is provided at or near the outlet port P2.

With such a configuration, the conductor tubes 31 to 33, 41, and 42 are arranged from the inner side in the radial direction: the second preheating conductor tube 32, the second overheating conductor tube 42, the third preheating conductor tube 33, the first overheating conductor tube 41, and the While being arranged in order of the 1st preheating conductor pipe 31, the 1st preheating conductor pipe 31, the 2nd preheating conductor pipe 32, the 3rd preheating conductor pipe 33, and the superheating conductor pipe 4 are connected in series in order.

One connection pipe element 43 is provided with an outlet port P2, and the other connection pipe element 44 is connected to the other axial end of the third preheating conductor pipe 33 . With this configuration, the fluid flowing from the other connecting pipe element 44 is branched by the connecting pipe element 44 into the first overheating conductor pipe 41 and the second overheating conductor pipe 42, and flows into the first overheating conductor pipe 41 and the second overheating conductor pipe 41. The fluid that has flowed through the conductor tube 42 merges at the connecting tube element 43 and flows out from the outlet port P2.

Moreover, the superheating conductor tube 4 connected in this way has a configuration in which the first overheating conductor tube 41 and the second overheating conductor tube 42 are electrically connected in parallel by the connecting tube 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 to third preheating conductor tubes 31, 32, and 33, which are primary coils, and a short-circuit current flows. That is, a short-circuit current flows through the first overheating conductor tube 41 from one axial end toward the other axial end, and a short-circuit current flows through the second overheating conductor tube 42 from the other axial end toward the one axial end. short-circuit current flows.

Further, in the superheated steam generator 100 of the present embodiment, as shown in FIGS. 1 and 2, between the first preheating conductor pipe 31 and the first overheating conductor pipe 41 A heat insulating material 8 is filled between the conductor pipe 33, between the third preheating conductor pipe 33 and the second overheating conductor pipe 42, and between the second overheating conductor pipe 42 and the second preheating conductor pipe 32. ing. The heat insulating material 8 is also filled in the gaps between the wound portions of the preheating conductor tubes 31 to 33 and also in the gaps between the wound portions of the overheating conductor tubes 41 and 42 . In this embodiment, the casing 9 is provided around the outer periphery of the first preheating conductor pipe 31 , and the 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 21 a and 22 a of the closed magnetic circuit core 2 and the second preheating conductor pipe 32 .

In the superheated steam generator 100 of the present embodiment configured as described above, an AC voltage is applied to the power supply terminal 61 provided on the first preheating conductor tube 31 and the power supply terminal 62 provided on the third preheating conductor tube 33 from an AC power supply. When applied, alternating current flows through the first to third preheating conductor tubes 31, 32, and 33, and magnetic flux flows through the closed magnetic circuit iron core 2. FIG. The magnetic flux causes a short-circuit current to flow through the first overheating conductor tube 41, the second overheating conductor tube 42, and the connecting tube elements 43 and 44, and the overheating conductor tube 4 generates Joule heat. Also, the first to third preheating conductor tubes 31 , 32 , 33 are heated by heat transfer from the superheating conductor tube 4 as well as Joule heat due to energization due to the application of AC voltage.

As a result, as shown in FIG. 5, the water introduced from the introduction port P1 of the first preheating conductor pipe 31 flows through the first to third preheating conductor pipes 31, 32, 33, thereby It is heated by preheating conductor pipes 31, 32, and 33 to become high-temperature water or saturated steam. After that, the high-temperature water or saturated steam that has flowed from the third preheating conductor pipe 33 into the superheating conductor pipe 4 is heated by the overheating conductor pipe 4 to become superheated steam, and is discharged from the outlet port P2.

<2. Effect of the present embodiment>
According to the superheated steam generator 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 first preheating conductor pipe 31 and the second preheating conductor pipe 32 are used. Since the superheating conductor tube 4 which is a secondary coil is provided between them, the first preheating conductor tube 31 and the second preheating conductor tube 32 are electrically heated and heated by utilizing the heat radiation of the overheating conductor tube 4. Therefore, heat radiation from the superheating conductor tube 4 to the outside of the device can be reduced, and thermal efficiency can be improved.

In particular, in the present invention, the third preheating conductor tube 33 is provided as the primary coil, and the third preheating conductor tube 33 is the first overheating conductor tube 41 and the second overheating conductor tube 42 that constitute the overheating conductor tube 4. Since it is provided between the first overheating conductor pipe 41 and the second overheating conductor pipe 42, it is heated by effectively utilizing heat radiation between the first overheating conductor pipe 41 and the second overheating conductor pipe 42, and the thermal efficiency can be further increased.

Here, the first preheating conductor tube 31, the second preheating conductor tube 32, and the third preheating conductor tube 33 forming the primary coil are set by setting the number of turns, the current-carrying cross-sectional area of the conductor tube, and the flow hole diameter of the conductor tube. , the heat generation ratio, the heat transfer area ratio to the fluid, and the flow velocity ratio of the fluid can be adjusted.

In addition, the first preheating conductor pipe 31, the second preheating conductor pipe 32, the third preheating conductor pipe 33, and the overheating conductor pipe 4 are connected in series in this order. Water or steam is introduced, and the superheated steam is led out from the lead-out port P2 provided in the superheating conductor pipe 4 via the second preheating conductor pipe 32 and the third preheating conductor pipe 33, so that the superheated steam generator 100 It can be simplified and miniaturized.

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

By making the superheating conductor tube 4 a secondary coil with multiple turns, the excitation current can be reduced and the leakage impedance can be reduced. can be reduced and the thermal efficiency can be increased. In addition, since the closed magnetic circuit core 2 has a multistage shape to increase the surface area of the core, the cooling effect can be increased.

<3. Modified Embodiment of the Present Invention>
It should be noted that the present invention is not limited to the above embodiments.
For example, in the above-described embodiment, each of the first to third preheating conductor tubes 31, 32, 33 is a single-layer wound one, but at least one of the first to third preheating conductor tubes 31, 32, 33 is It may be wound in two or more layers.

In the above-described embodiment, the winding directions of the first overheating conductor tube 41 and the second overheating conductor tube 42 are opposite to each other. may be in the same direction. In this case, one axial end portion of the first overheating conductor pipe 41 and the other axial end portion of the second overheating conductor pipe 42 are connected by a connection pipe element 43, and the other axial end portion of the first overheating conductor pipe 41 and one axial end of the second overheating conductor pipe 42 are connected by a connection pipe element 44 .

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

In addition, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100... Superheated steam generator 2... Closed magnetic circuit iron cores 21 and 22... Iron core elements 21a and 22a... Leg iron core part 3... Preheating conductor pipe 31... First preheating conductor pipe 32. Second preheating conductor tube 33 Third preheating conductor tube 4 Overheating conductor tube 41 First overheating conductor tube 42 Second overheating conductor tube 43, 44 Connection tube element P1...Introduction port P2...Outlet port 8...Insulating material

Claims (5)

A superheated steam generator for generating 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 core;
A helical preheating conductor tube that is a primary coil to which an alternating voltage is applied and is arranged around the closed magnetic circuit core;
A secondary coil through which an induced current flows, and a helical overheating conductor tube arranged around the closed magnetic circuit core,
The preheating conductor tube has a first preheating conductor tube, a second preheating conductor tube, and a third preheating conductor tube concentrically arranged around the closed magnetic circuit core,
The overheating conductor tube includes a first overheating conductor tube and a second overheating conductor tube that are arranged concentrically around the closed magnetic circuit core and spirally wound in opposite directions to each other, and the first overheating conductor tube. and a connection pipe element that fluidly connects one axial end and the other axial end of the second overheating conductor pipe and short-circuits them,
The conductor tubes are arranged in the order of the second preheating conductor tube, the second overheating conductor tube, the third preheating conductor tube, the first overheating conductor tube, and the first preheating conductor tube from the radially inner side, The first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the overheating conductor tube are connected in series in this order,
Water or steam is introduced from an introduction port provided in the first preheating conductor pipe, and superheated from an outlet port provided in the superheating conductor pipe via the second preheating conductor pipe and the third preheating conductor pipe. A superheated steam generator for deriving steam. The lead-out port is formed at one axial end of the overheating conductor tube,
2. The superheated steam generator according to claim 1, wherein the third preheating conductor pipe is introduced with water or steam from one axial end on the same side as the lead-out port. 3. The superheated steam generator according to claim 1, wherein the introduction port is formed at one axial end of the first preheating conductor pipe on the same side as the outlet port. Between the first preheating conductor tube and the first overheating conductor tube, between the first overheating conductor tube and the third preheating conductor tube, and between the third preheating conductor tube and the second overheating conductor tube 4. The superheated steam generator according to any one of claims 1 to 3, wherein a heat insulating material is filled between the second overheating conductor pipe and the second preheating conductor pipe. The first preheating conductor tube, the second preheating conductor tube and the third preheating conductor tube are single-layer wound,
The introduction port is formed at one axial end of the first preheating conductor pipe,
The other axial end of the first preheating conductor tube is connected to the other axial end of the second preheating conductor tube,
One axial end of the second preheating conductor tube is connected to one axial end of the third preheating conductor tube,
5. The AC power supply for applying the AC voltage is connected to one axial end of the first preheating conductor tube and the other axial end of the third preheating conductor tube. The superheated steam generator according to 1.

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