JP2013113574A - Gas heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas heating device capable of efficiently heating gas.SOLUTION: A gas heating device comprises an introduction part 32 into which gas is introduced, a plurality of heating pipes 34 each of which includes one end connected to the introduction part 32 such that the gas introduced into the introduction part 32 is branched and introduced into each heating pipe, a coil for induction heating 42 which is wound around a periphery of each heating pipe 34, and a discharge part 36 connected to the other end of each heating pipe 34 such that the gas heated by each heating piping 34 is made confluent. The heating pipes 34 are arranged along the inside of the coil for induction heating 42.

Description

  The present invention relates to a gas heating apparatus that is used to heat saturated steam to generate superheated steam or to heat other gases.

Superheated steam is widely used in various fields such as manufacturing and medicine, and various apparatuses for generating the superheated steam have been known. In order to generate superheated steam, a method is employed in which saturated steam generated in a boiler is heated again by another means such as a heater.
Furthermore, as a method for heating saturated steam, heating by induction heating has been conventionally studied.

5 and 6 show a conventional superheated steam generator that generates superheated steam by induction heating.
The superheated steam generator 10 discharges the superheated steam generated by the introduction unit 11 for introducing saturated steam, the heating unit 12 that heats the introduced saturated steam to generate superheated steam, and the heating unit 12. And a discharge unit 16.
A plurality of heating tube bodies 13 are arranged in the heating unit 12. One end of each heating tube 13 is connected to the introduction part 11 and is provided so that the saturated steam introduced into the introduction part 11 can be distributed and distributed to each. The other end of the heating tube 13 is connected to the discharge unit 16, and the superheated steam generated through each heating tube 13 joins and is discharged by the discharge unit 16.

A coil 15 for induction heating is wound around the heating tube body 13.
In addition, since the heat exchange efficiency from the coil 15 deteriorates when the saturated steam flowing through the heating tube 13 goes straight, the inside of the heating tube 13 is set so that the saturated steam becomes turbulent in the heating tube 13. Is provided with a corrugated plate (not shown) as a baffle.
Such a plurality of heating tube bodies 13 are densely arranged between the introduction portion 11 and the discharge portion 16 so as to be substantially circular in cross section as shown in FIG.

JP 2007-24336 A

By the way, in the superheated steam generator of the structure as mentioned above, the heating tube body arrange | positioned at the side (outer peripheral side) close | similar to a coil, and the heating in the heating tube body arrange | positioned far from a coil (inner peripheral side) It was found that the temperatures were different.
That is, the heating tube on the side close to the coil has a high temperature, but the heating tube on the side far from the coil has a low temperature.

  When the state of temperature change of the heating tube after passing current through the coil was confirmed by thermography etc., the outer heating tube immediately adjacent to the coil immediately became high temperature, and then the heating tube that was densely arranged Of these, it was confirmed that the inner heating tube was gradually heated from the outside toward the center. Due to the nature of induction heating, the portion close to the coil becomes hot due to electromagnetic induction from the coil. Therefore, there is a temperature difference between the heating tube body close to the coil and the heating tube body located away from the coil.

As described above, when a plurality of heating tubes are arranged so as to have a circular cross section, the temperature of the superheated steam generated on the outside and the inside is different.
However, since the superheated steam generated in each heating tube merges in the discharge section, the high-temperature superheated steam and the low-temperature superheated steam are mixed and discharged as superheated steam at a predetermined temperature. .

As described above, in the conventional superheated steam generator, high temperature superheated steam and low temperature superheated steam are mixed to set the temperature of the superheated steam discharged from the discharge unit.
That is, in the conventional superheated steam generator, induction heating must be performed so that the temperature of the superheated steam in the heating tube disposed outside is higher than the set temperature of the discharged superheated steam. When trying to generate high-temperature superheated steam, there is a problem that stress on the outer heating tube body is large, and usable materials are expensive, or the upper limit temperature of the superheated steam is restricted.

  In addition, the superheated steam generator as described above can be used not only for heating the saturated steam to generate superheated steam but also for heating other gases and for various applications. For this reason, even when heating other gas, it cannot respond to the use which cannot be used if it is not processed above the specified temperature, such as sterilization, deodorization, and chemical reaction.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gas heating device that can heat a gas to a high temperature without restriction.

According to the gas heating device according to the present invention, an introduction portion into which gas is introduced, one end portion is connected to the introduction portion, and a plurality of heating pipe bodies into which the gas in the introduction portion is branched and introduced, A coil for induction heating wound around a plurality of heating pipes, and a discharge part to which the other end of each heating pipe is connected and the gas heated by each heating pipe joins The plurality of heating tubes are arranged along the inside of the induction heating coil.
By adopting this configuration, there is no heating tube inside the heating tube arranged along the inside of the coil, and a predetermined temperature compared to the case where there is also a heating tube inside. It becomes possible to heat the gas.

  Further, the plurality of heating tube bodies may be arranged in a line of a circle when viewed from the axial direction of the heating tube body.

Further, the induction heating coil may be wound at a position spaced from the introduction part and the discharge part.
According to this configuration, if the introduction part and the discharge part are made of a nonmagnetic material, the introduction part and the discharge part made of a nonmagnetic material are not induction-heated. By separating, only the heating tube can be efficiently heated.

  According to the present invention, gas can be efficiently heated.

It is a side view of the gas heating device concerning the present invention. It is a side view which shows the place which removed the coil for induction heating from the gas heating apparatus of FIG. It is a front view of an introduction part and a discharge part. It is a front view of a connection flange part. It is a side view of the conventional superheated steam generator. It is explanatory drawing which shows arrangement | positioning of a heating pipe body.

A preferred embodiment of a gas heating device according to the present invention will be described below.
Here, as one embodiment of a gas heating device, a superheated steam generator that heats saturated steam to generate superheated steam will be described based on the drawings.
1 shows a side view of the superheated steam generator 30, FIG. 2 shows the induction heating coil removed from FIG. 1, and FIG. 3 shows a front view of the introduction part and the discharge part. 4 has shown the front view of the connection flange part for connecting a heating pipe body to an introducing | transducing part and a discharge part.

The superheated steam generator 30 includes a bowl-shaped introduction part 32 having an introduction port 31 formed in the center, a plurality of heating pipes (twisted pipes) 34 having one end connected to the introduction part 32, and a plurality of A discharge section 36 to which the other end of the heating tube 34 is connected is provided. However, the introduction part 32 is not limited to a bowl shape.
A coil 42 for induction heating is wound around the whole of the plurality of heating tube bodies 34.

  The introduction part 32 has a curved surface shape in which the introduction port 31 protrudes and is convex toward the introduction port 31 when viewed from the side. Piping from a boiler (not shown) can be connected to the introduction port 31, and saturated steam generated by the boiler is introduced into the introduction part 32. The inside of the introduction part 32 is hollow, and saturated steam is introduced therein.

  A flange portion 35 having a diameter larger than that of the main body portion of the introduction portion 32 is provided integrally with the introduction portion 32 on the discharge portion 36 side of the introduction portion 32. The flange portion 35 is provided for attaching a connection flange portion 38 having the same diameter. The flange portion 35 and the connection flange portion 38 are fixed by bolts and nuts (not shown). Further, a gasket 41 is interposed between the flange portion 35 and the connection flange portion 38 to provide airtightness.

  The introduction part 32 (including the flange part 35) and the connection flange part 38 in the present embodiment are made of stainless steel such as SUS304 which is a non-magnetic material.

In the present embodiment, the discharge unit 36 has the same structure as the introduction unit 32.
That is, the discharge part 36 has a curved surface shape in which the discharge port 43 protrudes and is convex toward the discharge port 43 side.
A flange portion 39 having a diameter larger than that of the main body portion of the discharge portion 36 is provided integrally with the discharge portion 36 on the introduction portion 32 side of the discharge portion 36. The flange portion 39 is provided for attaching a connection flange portion 45 having the same diameter.
The flange portion 39 and the connection flange portion 45 are fixed by bolts and nuts (not shown). In addition, a gasket 41 is interposed between the flange portion 39 and the connection flange portion 45 to provide airtightness.

  The connection flange portion 38 is a circular plate-like member when viewed from the front, and is provided so as to close the opening on the flange portion 35 side of the introduction portion 32. However, a plurality of attachment holes 40 are formed in the connection flange portion 38 so that a plurality of heating tube bodies 34 can be attached, and saturated steam in the introduction portion 32 is supplied from each attachment hole to each heating tube body 34. Can be branched and introduced. In addition, the mounting holes 40 are arranged in a ring shape so that the plurality of heating tube bodies 34 are arranged in a row.

As the heating tube 34, a twisted tube is employed in the present embodiment.
A twisted tube is a tubular member in which a groove twisted along the axial direction is formed, and is provided so that the gas (saturated steam) flowing through the interior advances in the axial direction while rotating without going straight. It becomes the composition.
Thus, by making the heating tube 34 a twisted tube, the gas (saturated steam) advances in the axial direction while rotating in the heating tube 34. For this reason, the gas (saturated steam) is always in contact with the wall surface of the heating tube 34, and the heating efficiency can be increased.
The heating tube 34 is a twisted tube, so that the cost can be reduced as compared with the case where a corrugated plate as a baffle is provided as described in the prior art.

Moreover, as the heating tube 34 in this embodiment, it is necessary to use a magnetic material such as SUS430. By using a magnetic material for the heating tube 34, induction heating by the induction heating coil 42 can be performed.
The heating tube is not limited to a twisted tube, but may be any structure that allows gas to swirl and advance. For example, the structure which arrange | positioned the board | plate material formed by twisting along the advancing direction of a pipe | tube inside the pipe | tube may be arrange | positioned, and the groove | channel which can rotate gas may be further formed in the wall surface of the pipe | tube.

The other end of the heating tube 34 is connected to a connection flange 45 attached to the discharge unit 36.
The connection flange portion 45 on the discharge portion 36 side has the same structure as the connection flange portion 38 on the introduction portion 32 side, and a plurality of mounting holes 40 are formed. The mounting holes 40 are annularly arranged so that the plurality of heating tube bodies 34 are arranged in a row.
The connection flange portion 45 is also a plate-like member having a circular shape when viewed from the front, and is provided so as to close the opening portion on the opposite side of the discharge port 43 of the discharge portion 36. Superheated steam is introduced into the discharge section 36 from the plurality of heating tube bodies 34 through the attachment holes 40 and mixed, and superheated steam is discharged from one discharge port 43.

  As described above, the plurality of heating tube bodies 34 are arranged in a line around the inside of the coil 42, and the inside of the circumference is a cavity. Accordingly, the circumferentially arranged heating tube 34 is reliably heated by the induction heating coil 42 described later, and there is no need to perform useless heating as in the prior art. Moreover, the responsiveness at the time of temperature control becomes very good.

The induction heating coil 42 is arranged by winding around a plurality of heating tubes 34 arranged in a row of circles.
In the present embodiment, the induction heating coil 42 is wound at a position spaced apart from the connection flange portion 38 on the introduction portion 32 side and the connection flange portion 45 on the discharge portion 36 side by a predetermined distance. This is because both the connecting flange portions 38 and 45 of the present embodiment are made of a nonmagnetic material, and the induced magnetic field is concentrated on the heating tube 34 that is a magnetic material.

  In the present embodiment, the coil 42 for induction heating has a constant interval between adjacent lines, and the interval is made as narrow as possible, so that the induction magnetic field efficiently strikes the heating tube 34.

In this way, the periphery of the plurality of heating tubes 34 arranged in a row is wound around the induction heating coil 42, and a predetermined current is passed through the coil 42, whereby the heating tube is heated by induction heating. 34 is heated.
When the saturated steam generated by the boiler is introduced into the introduction part 32, the saturated steam is heated to 300 to 400 ° C. in the heating tube 34, and superheated steam is generated. The generated superheated steam is discharged from the discharge port 43 and used for various purposes.

The gas heating apparatus according to the present invention is not only used to generate saturated steam by heating saturated steam, but also for use in, for example, discharging odorless gas by introducing and heating gas containing malodor. it can. By introducing a gas containing malodor to this gas heating device, the odor molecules that are the source of the malodor can be decomposed at high temperatures by induction heating, so that it can be non-brominated.
Further, the gas heating application is not limited to these, and various other things can be used.

  While the present invention has been described above with reference to a preferred embodiment, the present invention is not limited to this embodiment, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .

30 Superheated steam generator 31 Introduction port 32 Introduction portion 34 Heating tube 35 Flange portion 36 Discharge portion 38 Connection flange portion 39 Flange portion 40 Mounting hole 41 Gasket 42 Coil for induction heating 43 Discharge port 45 Connection flange portion

Claims (3)

An introduction part into which gas is introduced;
One end portion is connected to the introduction portion, a plurality of heating pipe bodies into which the gas in the introduction portion is branched and introduced,
A coil for induction heating wound around a plurality of heating tubes;
The other end of each heating tube is connected, and includes a discharge unit where gas heated by each heating tube joins,
The gas heating apparatus, wherein the plurality of heating tube bodies are arranged along the inside of the induction heating coil.   The gas heating device according to claim 1, wherein the plurality of heating tube bodies are arranged in a line of a circle when viewed from the axial direction of the heating tube body.   The gas heating device according to claim 1 or 2, wherein the induction heating coil is wound at a position spaced apart from the introduction part and the discharge part.

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