JP2002206868A - Superheated steam treating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superheated steam treating furnace good in energy efficiency upon raising the temperature of a treating vessel. SOLUTION: The superheated steam treating furnace comprises a superheating heater 20 for generating superheated steam and the treating vessel 10 for carrying out a thermal treatment by the superheated steam generated by the superheating heater 20. The superheating heater 20 is a pipe member generating heat upon turning on a power. The pipe member 20 is bent in the treating vessel 10 to surround an accommodated part P of a member to be treated. The superheating heater 20 has one end 21 of the pipe member connected to the treating vessel 10 and the other end 23 of the pipe member connected to a terminal 24a insulated from the treating vessel 10. At an intermediate part, a spiral part 22 is provided for allowing the steam to flow downward from an upper part. The superheating heater 20 has a jet port 23 for jetting the steam upward from the lower part of the treating vessel 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superheated steam processing furnace capable of performing food processing, refuse incineration, and the like. More specifically, the present invention relates to a superheated steam processing furnace provided with a superheated heater for generating superheated steam and a processing vessel for performing a heat treatment using the superheated steam generated by the superheated heater.

[0002]

2. Description of the Related Art Conventionally, as a superheated steam treatment furnace as described above, for example, Japanese Utility Model Laid-Open No. 57-92763,
No. 83547 and JP-A-6-90677 are known. All of these generate superheated steam outside the superheating furnace and supply it to the superheating furnace.

[0003] However, even if the superheated steam is once heated to a high temperature, as soon as it is supplied to the superheat furnace, the temperature rise in the superheat furnace is suppressed by heat radiation, and a sufficient processing temperature cannot be obtained. In the technology described in the first publication,
Although a separate heater is provided in the vicinity of the superheater to control the temperature, extra power is required and energy efficiency is not high.

[0004]

SUMMARY OF THE INVENTION In view of such a conventional situation, an object of the present invention is to provide a superheated steam treatment furnace having good energy efficiency when increasing the temperature in a processing vessel.

[0005]

In order to achieve the above object, a superheated steam processing furnace according to the present invention is characterized by a superheater for generating superheated steam, and a process for performing heat treatment using superheated steam generated by the superheated heater. In the configuration provided with the container, the overheater is a tube that generates heat when energized, and this tube is bent in the processing container to surround the storage section of the object to be processed.

[0006] It is desirable that the tube be bent spirally. In this case, the superheater is configured to be a pair of spirals wound around the tube in the same direction, and the directions of the superheating currents applied to the spirals are different from each other.
Generation of electromagnetic waves can be suppressed.

[0007] The overheating heater may connect one end of the tube to the processing container, and connect a terminal insulated from the processing container to the other end of the tube.

[0008] If the superheater has a pipe portion through which steam is circulated from top to bottom, and a jet port for jetting steam upward from a lower portion of the processing vessel, the steam is transferred into the pipe. Overheating can be carried out sufficiently.

[0009] The accommodating portion of the object to be processed may be a cylindrical body that is driven and rotated by being surrounded by the tube, and superheated steam from the superheater may be introduced into the cylindrical body.

[0010]

As described above, according to the characteristics of the superheated steam processing furnace according to the present invention, the tube is bent in the processing vessel to surround the storage section of the object to be processed. Accept superheated steam in the condition. As a result, the storage section could be sufficiently heated, and the heat efficiency of the superheater itself was used for the residual heat, so that the energy efficiency was also very good. Other objects, configurations and effects of the present invention will be apparent in the following embodiments of the present invention.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to the attached drawings,
The present invention will be described in more detail. FIG. 2 is a block diagram of the superheated steam processing apparatus 1 according to the present invention. The superheated steam treatment apparatus 1 of the present invention can be used for applications such as baking of food, roasting, processing of industrial products, incineration of garbage, and carbonization. The superheated steam processing apparatus 1 converts water taken in from a purified water introduction pipe 2 into steam in a boiler 3, and heats the steam with a heater 20 to generate superheated steam. An object to be processed is stored in the processing container 10, and superheated steam is introduced from the heater 20 into the processing container 10 to perform heat treatment. In the present invention, the heater 20
Are housed in the processing vessel 10 to constitute the superheated steam processing furnace 4 as a whole.

The exhaust gas is discharged from the exhaust pipe 8 in a state where the exhaust gas is processed by the high-temperature exhaust processing device 6 to remove impurities. However, when the processing temperature in the processing vessel 10 is relatively low and the exhaust has a large amount of tar, etc., the exhaust of the processing vessel 10 is further heated by the post-heating heater 5 to decompose the tar, and the high-temperature exhaust treatment device 6 It is desirable to perform processing. Note that the boiler 3 can be omitted by making the heating length of the heater 20 sufficient.

As shown in FIG. 1, the processing container 10 has a lid 12 that is openable and closable fitted on the upper part of a cylindrical container body 11 and is closed by a plurality of bolts 13. The upper portion of the mesh container 18 is engaged with the flange 11a on the upper portion of the container body 11, and the inside of the mesh container 18 becomes a storage portion P for the object to be processed. Superheated steam V is supplied to the storage section P upward from the discharge section 23 located at the lower center of the container body 11.
Further, the exhaust gas used for the processing is exhausted to the outside through the exhaust pipe 14.

The heater 20 is formed by spirally winding a tube made of stainless steel or the like. The heater 20 guides the steam taken in from the introduction portion 21 downward while heating the steam with the spiral portion 22. The superheated steam V is ejected from the discharge part 23 located at the lower center of the container. The spiral portion 22 surrounds the mesh container 18, and the heat of the spiral portion 22 is radiated to the storage portion P in the mesh container 18.

The introduction portion 21 side of the heater 20 is the container body 1
1 is mounted directly in a conductive state with respect to
One side is grounded. In addition, the spiral portion 22 includes a plurality of insulators 1.
The position is fixed while being insulated from the container main body 11 by the lower insulator 5 and the lower insulator 16. The terminal screw 24a is connected to the container body 11
Is fixed to the container body 11 in an insulated state by being inserted through the hole formed through the cylindrical insulator 17 and tightened by the two nuts 24b, 24b. One end of this electrode 24 is a terminal plate 24
The terminal c is connected to the discharge unit 23 side, and the anode of the power supply 30 is connected to the discharge unit 23 via the terminal screw 24a.

Although not shown, it is desirable to wind a heat insulating material such as glass wool around the processing vessel 10. Further, the container body 11 may have a double structure.

For example, when a stainless steel tube is used for the heater 20, a DC or AC power supply of several tens of volts may be used as the power supply 30. By energizing a large current such as 200 to 300 A, the temperature of the storage section P can be raised to at least about 800 ° C.

The heater 20 has a helical portion 22 and generates a strong magnetic field when a large current flows. Therefore, if the heater 20 is not shielded, it becomes a source of electromagnetic interference. Therefore, as shown in FIGS. 3 to 6, two spiral bodies wound in the same direction, that is, a first heater 20 a and a second heater 20 b, are combined as the heater 20, and currents having opposite polarities are supplied by the power supply 30. It is possible to generate a reverse magnetic field and reduce the total magnetic flux. In these figures, the power source 30 is shown as a DC power source for the sake of explanation of the polarity, but an AC power source with the polarity set in reverse may of course be used.

In FIG. 3, the first heater 20a and the second heater 20b are connected by an upper connecting portion 20c.
The low-temperature steam is introduced from an inlet 21 located below the first heater 20a, and ejects superheated steam upward from an outlet 23 located below the second heater 20b. The power supply 30 is connected between the introduction section 21 and the discharge section 23. The heater 20 in FIG. 4 is the same as in FIG.
The power supplies 30, 30 are connected to the introduction section 21 and the connection section 20c, respectively.
The difference is that the connection is made between the discharge part 23 and the connecting part 20c.

In FIG. 5, the first heater 20a and the second heater 20b are wound in parallel, and the low-temperature steam is introduced from the inlets 21 located above both, respectively.
Superheated steam is spouted upward from discharge sections 23, 23 located at both lower portions. First heater 20
a, the power supply 3 is connected between the inlets 21 and 21 and the outlets 23 and 23 of the second heater 20b in opposite polarities.
0 and 30 are connected. The heater 20 in FIG. 6 is the same as that in FIG. 5 except that the discharge portions 23 are short-circuited to each other.
And the power supply 30 is connected between the introduction sections 21 and 21.

Next, as another embodiment of the superheated steam treatment furnace 4, a roasting machine 40 will be described with reference to FIG. The same members as those in the above-described embodiment are denoted by the same reference numerals.

The roasting machine 40 of the present embodiment roasts, for example, coffee beans. The heater 20 is housed in an outer container 41, and the helical portion 22 of the heater 20 is provided.
A rotating inner container 42 is housed therein. Inner container 42
Is supported by the outer container 41 by bearings 43a at both ends,
It rotates around the axis 43. The shaft 43 is driven and rotated by a motor 45 via a chain 46.

In the heater 20 of the present embodiment, low-temperature steam is introduced from an introduction portion 21 located below, and
2 rises while passing upward, and is introduced into the middle cylinder 44 from the discharge section 23 via a rotary joint (not shown). The middle cylinder 44 penetrates the inner container 42 and has many small holes 44a.
Superheated steam supplied from the container is ejected into the storage section P in the inner container 42 to perform steam processing. In the inner container 42, a plurality of feathers 4
2a protrudes and stirs the coffee beans and the like in the storage section P.
In use, the entire roasting machine 40 performs a rotating operation in an inclined state. This apparatus can be used for roasting other than coffee beans and for superheated steam treatment of other industrial products.

Finally, the possibility of another embodiment of the present invention will be described. In the above embodiment, the heater 2
0 was spirally wound so as to surround the storage portion P. However, the housing P may be surrounded by the heater 20 by meandering the tube of the heater 20 up and down or left and right. However, the spiral tube arrangement is excellent in that the temperature distribution in the horizontal direction in the processing container 10 is made uniform.

In the above embodiment, stainless steel or the like is used for the tube of the heater 20. However, a member having a high resistance value, such as that used for an electric resistance heating element, may be used as the tube of the heater 20.
It is also possible to use a commercial power supply such as 00V or 200V.

In the above embodiment, the heater 20 is provided with only one discharge section 23. However, a plurality of discharge units 23 may be provided, and the discharge units 23 can be appropriately changed depending on the configuration of the heater 20.

The embodiments described above can be implemented in combination with each other. Further, reference numerals written in the claims are merely for convenience of comparison with the drawings, and the present invention is not limited to the configuration of the attached drawings by the writing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a processing vessel in a superheated steam processing furnace.

FIG. 2 is a block diagram of a superheated steam processing apparatus.

FIG. 3 is a perspective view showing a first alternative embodiment of the superheater.

FIG. 4 is a perspective view showing a second alternative embodiment of the superheater.

FIG. 5 is a perspective view showing a third alternative embodiment of the superheater.

FIG. 6 is a perspective view showing a fourth alternative embodiment of the superheater.

FIG. 7 is a sectional view showing another embodiment of the superheated steam processing furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Superheated steam processing apparatus 2 Purified water introduction pipe 3 Boiler 4 Superheated steam processing furnace 5 Post-superheater 6 High temperature exhaust processing apparatus 8 Exhaust pipe 10 Processing vessel 11 Container body 11a Flange 12 Lid 13 Bolt 14 Exhaust pipe 15 Insulator 16 Lower insulator 17 Cylindrical insulator 18 Reticulated container 20 Heater 20a, b First and second heaters 20c Connecting portion 21 Introducing portion 22 Spiral portion 23 Discharging portion 24 Electrode 24a Terminal screw 24b Nut 24c Terminal plate 30 Power supply 31 Short-circuit portion 40 Roasting machine 41 Outer container 42 inner container 42a blade 43 shaft 43a bearing 44 middle cylinder 44a small hole 45 motor 46 chain E ground P storage section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/46 ZAB F23G 5/46 ZABZ

Claims (6)

[Claims] 1. A superheated steam processing furnace comprising: a superheater (20) for generating superheated steam; and a processing vessel (10) for performing heat treatment by the superheated steam generated by the superheated heater (20). Superheater (2
0) is a tube that generates heat when energized, and this tube (2)
0) a tube superheated steam treatment furnace which bends the inside of the processing container (10) to surround the storage section (P) of the object to be processed. 2. A superheated steam treatment furnace according to claim 1, wherein said tube (20) is spirally bent. 3. The superheater (20) is a pair of spiral bodies (20a, 20b) obtained by winding the tubular body in the same direction, and determines the direction of a current for superheating applied to each spiral body (20a, 20b). 3. The superheated steam treatment furnace according to claim 2, wherein the furnaces are different from each other. 4. The superheater (20) connects one end (21) of the tube to the processing vessel (10), and the other end (23) of the tube is insulated from the processing vessel (10). The superheated steam treatment furnace according to any one of claims 1 to 3, further comprising a terminal (24a) connected thereto. 5. A pipe section (22) through which the superheater (20) circulates steam from top to bottom, and a jet port (20) for jetting steam upward from a lower portion of the processing vessel (10). The superheated steam treatment furnace according to any one of claims 2 to 4, comprising: 6. A storage section (P) for an object to be processed is provided in said tubular body (2).
0) is a cylindrical body (42) that is driven and rotated while being surrounded by the superheater (2).
The superheated steam treatment furnace according to any one of claims 1 to 5, wherein superheated steam from (0) is introduced.