JP4451348B2 - Drying equipment - Google Patents

Description

  The present invention relates to a drying device, and more particularly to a drying device suitable for use in a drying process when manufacturing a honeycomb formed body.

  In recent years, honeycomb molded bodies have been used for purification of drainage and clean water, microfiltration of industrial process water and air, sterilization in the field of pharmaceutical production and cosmetic production, clarification filtration of solutions, foods and beverages, and gas separation. It is used in a wide variety of fields such as.

  By the way, as a material of such a honeycomb formed body, generally, ceramics excellent in high temperature strength, wear resistance, corrosion resistance and the like are used.

  Further, as a general structure of a honeycomb formed body, a honeycomb structure having an outer skin in which a large number of cells are provided by partition walls is used.

  Conventionally, when manufacturing this type of honeycomb molded body, a kneaded ceramic material is extruded into a honeycomb shape, and the extruded product is cut into a desired length, and then dried and fired. .

  Here, as a method of drying the honeycomb formed body, the moisture inside the honeycomb formed body is directly transferred by using an external drying method in which the heat energy of the hot air or the heater is transmitted from the outside of the honeycomb shaped body, or by using microwave energy. An internal drying method for heating is known, and these external drying methods and internal drying methods are often used in appropriate combinations (see Patent Documents 1 to 4).

However, in the external drying method using hot air (including the case of using an internal drying method that uses microwaves), the humidity in the ambient atmosphere of the honeycomb molded body is low, and compared to the inside of the honeycomb molded body. Therefore, the drying of the surface proceeds and the drying of the honeycomb molded body becomes uneven between the inside and the inside of the honeycomb molded body, resulting in a difference in shrinkage. For this reason, defects such as wrinkles and warps are likely to occur. there were.

  Furthermore, in recent years, honeycomb molded bodies have greatly increased the number of cells per unit area in order to improve the purification capacity. However, as the number of cells per unit area increases, hot air is introduced into the honeycomb molded body. There is a problem that defects such as wrinkles and warps become prominent because they reach.

In addition, in the internal drying method using microwaves, there is a problem that the moisture contained in the cells inside the honeycomb formed body expands and it is difficult to escape outwardly, leading to cell deformation.

JP-A-9-77552 JP 2001-19533 A JP 2003-145521 A JP 2003-170413 A

  The present invention has been made in view of the various problems of the prior art as described above, and the object of the present invention is to reduce wrinkles, warpage, and the like in the drying process when manufacturing a honeycomb formed body. An object of the present invention is to provide a drying apparatus in which defects are hardly generated.

  In addition, an object of the present invention is to provide a drying apparatus in which it is difficult to cause cell deformation or the like in a drying process when manufacturing a honeycomb formed body.

  In order to achieve the above object, the present invention can maintain the moisture in each part of the honeycomb molded body evenly in order to dry the honeycomb molded body without causing defects such as wrinkles and warps, and cell deformation. Therefore, it is necessary to dry the honeycomb formed body from the inside while keeping the ambient humidity at a proper level.

That is, the invention according to claim 1 of the present invention is a drying apparatus for drying a honeycomb formed body, and a furnace body containing the honeycomb formed body therein , heating saturated steam to generate superheated steam , Superheated steam generation means for supplying the generated superheated steam into the furnace body, dry air supply means for supplying dry air into the furnace body, and the amount of dry air supplied to the furnace body by the dry air supply means is controlled. Control means for adjusting the mixing amount of the superheated steam generated and supplied by the superheated steam generation means and the dry air supplied by the dry air supply means in the furnace body by the control means. The superheated steam and the dry air whose mixing amount is adjusted are sprayed on the honeycomb formed body housed in the furnace body. It is. Further, the invention according to claim 2 of the present invention is a drying apparatus for drying a honeycomb formed body, a furnace body that houses the honeycomb formed body therein, and an overheat that generates superheated steam and supplies it to the furnace body. Steam generating means, dry air supply means for supplying dry air to the furnace body, and control means for controlling the amount of dry air supplied in the furnace body by the dry air supply means, by the control means, The honeycomb formed body accommodated in the furnace body by adjusting the mixing amount of the superheated steam generated and supplied by the superheated steam generation means and the dry air supplied by the dry air supply means in the furnace body On the other hand, the superheated steam and the dry air with the mixed amount adjusted are sprayed, and the furnace body has a current plate and is disposed at one end portion in the horizontal direction. A superheated steam supply port for supplying superheated steam and dry air whose mixing amount is adjusted from the superheated steam generating means and the dry air supply means, and the superheated steam supply port at the other end in the horizontal direction. And an exhaust port disposed below and a drain port disposed below and having a punching plate.

Further, the invention according to claim 3 of the present invention is the invention according to claim 1 or 2 of the present invention, wherein the superheated steam generating means is steam generating means for generating saturated steam. And heating means for heating the saturated steam generated by the steam generating means, the furnace body, the heating means and the steam generating means are sequentially arranged in series, the heating means and the steam Dry air is supplied between the generating means and the dry air supplying means.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the heating means includes a heating chamber to which saturated steam generated by the steam generating means is supplied. A heating element disposed in the heating chamber, an induction heating coil disposed on the outer periphery of the heating chamber, and a high-frequency oscillator for supplying a high-frequency current to the induction heating coil are provided.

The invention according to claim 5 of the present invention is the invention according to claim 4 of the present invention, wherein the heating element is a stainless steel, Ni, Ni-Cr alloy, titanium or carbon which is a magnetic material. It is made of ceramics and has a meshed cylindrical shape penetrating .

In addition, the invention described in claim 6 of the present invention is the invention described in any one of claims 1, 2, 3 , 4 or 5 of the present invention, and further, microwaves are further introduced into the furnace body. And microwave irradiation means for supplying and irradiating .

According to a seventh aspect of the present invention, in the invention according to the sixth aspect of the present invention, the furnace body is further disposed on the upper side, and a microwave is applied by the microwave irradiation means. It has a microwave supply port to be supplied .

The invention of claim 8 is the invention of claim 7 of the present invention, the upper Symbol microwave irradiation means includes a waveguide connected to said microwave supply opening, And a microwave oscillator connected to the waveguide .

Moreover, invention of Claim 9 among this invention WHEREIN: In invention of any one of Claim 1, 3, 4, 5 , 6, 7 or 8 among this invention, the said furnace body is, A superheater that has a current plate and is disposed at one end in the horizontal direction and that is supplied with superheated steam and dry air with the mixing amount adjusted from the superheated steam generation means and the dry air supply means It has a steam supply port, an exhaust port disposed opposite the superheated steam supply port at the other end in the horizontal direction, and a drain port disposed below and having a punching plate. is there.

Further, the invention according to claim 10 of the present invention is the invention according to any one of claims 2 or 9 of the present invention, and has an exhaust duct connected to the exhaust port, and the exhaust A thermometer and a high-temperature hygrometer are installed in the duct .

The invention described in claim 11 among the present inventions is the invention described in any one of claims 1, 2, 3, 4 , 5, 6, 7, 8, 9 or 10 of the present invention. A support column erected on the inner peripheral surface of the furnace body, and an elastic member disposed on the support column, and the honeycomb molded body is connected to the furnace body by the support column via the elastic member. It is intended to be held in space .

Therefore, according to the present invention, the humidity and temperature of the superheated steam are adjusted by adjusting the mixing amount of the superheated steam and dry air. It is possible to suppress the occurrence of defects such as wrinkles and warps.

  In addition, according to the present invention, by adjusting the microwave supplied by the microwave irradiation means, the honeycomb molded body can be dried while keeping the moisture of the honeycomb molded body moderately. Since heating allows the internal moisture of the honeycomb formed body to be heated and uniformly diffused on the surface, it is possible to suppress the occurrence of defects such as wrinkles and warps, and also to suppress the occurrence of cell deformation and the like. .

  Since the present invention is configured as described above, it has an excellent effect that defects such as wrinkles and warp are less likely to occur in the drying process when manufacturing a honeycomb formed body.

  In addition, since the present invention is configured as described above, it has an excellent effect that cell deformation and the like are less likely to occur in the drying step when manufacturing the honeycomb formed body.

  Hereinafter, an example of an embodiment of a drying apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a conceptual configuration of a drying apparatus 10 according to an example of an embodiment of the present invention. A honeycomb molded body 12 is placed on a column 16 that is erected at the central portion of the inner periphery of a furnace body 14. In addition, a large number of holes 12a of the honeycomb structure of the honeycomb molded body 12 are held and accommodated horizontally through the elastic member 18, that is, along the longitudinal direction of the paper surface on which FIG. In addition, in FIG. 1, the hole 12a is notionally shown by the broken line.

  Here, the elastic member 18 has a shape that conforms to the outer shape of the honeycomb molded body 12 in order to hold the honeycomb molded body 12 without scratching, and the dimension covers the entire side surface 12b of the honeycomb molded body 12. It has.

  A superheated steam supply port 14 a having a rectifying plate 20 formed of a punching plate or the like is formed at one end in the horizontal direction of the furnace body 14, and this superheated steam supply port 14 a is connected via a pipe 22. The heating chamber 24 is connected to one end 24a in the horizontal direction.

  Further, an exhaust port 14b is formed at the other end of the furnace body 14 in the horizontal direction, and an exhaust duct 26 is connected to the exhaust port 14b. A thermohygrometer 30 is installed.

  On the other hand, a microwave supply port 14 c is provided in the upper part of the furnace body 14, and one end portion of the waveguide 32 is connected to the microwave supply port 14 c, and the other end portion of the waveguide 32. Is connected to a microwave oscillator 34. Further, a resin plate 36 for preventing the backflow of steam is installed in the microwave supply port 14c.

  Furthermore, a drain port 14 d having a punching plate 38 is provided at the lower part of the furnace body 14.

  In addition, a heating element 40 made of a magnetic material that hardly corrodes is installed in the heating chamber 24. The structure of the heating element 40 is a penetrating mesh.

  On the other hand, a series of induction heating coils 42 are wound around the outer periphery of the heating chamber 24, and one end 42 a and the other end 42 b of the induction heating coil 42 are connected to a high frequency oscillator 44. .

  A pipe 46 is connected to the other end 24 b in the horizontal direction of the heating chamber 24, and a steam generator 50 is connected to the pipe 46 via a valve 48. The steam generator 50 includes a water supply pipe 52 for supplying water from the outside, and a heater 54 for heating the water supplied from the water supply pipe 52. Therefore, the steam generated by the steam generator 50 is supplied to the heating chamber 24.

  In addition, as a means for the dry air supply unit 56 to detect and control the supply amount of the dry air supplied from the dry air supply unit 56 between the end 24 b of the heating chamber 24 in the pipe 46 and the valve 48. Are connected via a valve 58, a flow meter 60 and a regulator 62. That is, in the drying apparatus 10, a dry air supply unit is configured by the dry air supply device 56, and a control unit that controls the supply amount of dry air is configured by the valve 58, the flow meter 60, and the regulator 62.

  Reference numeral 64 denotes a furnace door which is disposed on the end side where the exhaust port 14b is provided so as to be openable and closable via a packing 66.

In the drying apparatus 10 described above, the steam generator 50, the water supply pipe 52, and the heater 54 constitute steam generating means, and the heating chamber 24, the heating element 40, the induction heating coil 42, and the high-frequency oscillator 44 serve as heating means. The superheated steam generation means is constituted by these.

  And in the drying apparatus 10, the furnace body 14, the heating chamber 24 which comprises a heating means, and the steam generator 50 which comprises a steam generation means are arrange | positioned sequentially in series, Dry air is supplied between the steam generator 50 and the dry air supplier 56.

  Further, in the drying apparatus 10, the microwave irradiation unit is configured by the waveguide 32 and the microwave oscillator 34.

In the above-described configuration, in the drying apparatus 10, the steam generated in the steam generator 50 is supplied to the heating chamber 24 to form superheated steam, and this superheated steam is introduced into the furnace body 14. By irradiating the inside of the body 14, the honeycomb formed body 12 is dried.

  Note that the superheated steam introduced into the furnace body 14 is adjusted in humidity and temperature by the amount of mixing with dry air, and the dried state of the honeycomb formed body 12 can be advanced.

More specifically, the drying apparatus 10 includes a furnace body 14 that houses the honeycomb formed body 12, a heating chamber 24 that heats steam connected to the furnace body 14, and a steam generator 50 that is connected to the heating chamber 24. And a dry air generator 56 connected to the heating chamber 24.

  The honeycomb molded body 12 is taken in and out of the furnace body 14 by opening and closing the furnace body door 64, and a packing 66 for shielding the inside and outside of the furnace body 14 is disposed on the furnace body door 64. ing.

  As described above, the elastic member 18 is disposed on the support column 16 erected at the central portion of the furnace body 14, and this elastic member 18 is used to hold the honeycomb formed body 12 without being scratched. It functions and is formed along the shape of the honeycomb formed body 12.

  The elastic member 18 can be configured by, for example, a sponge or a plate having punched holes, and the material thereof is, for example, a material that has a small loss coefficient for microwaves and is difficult to be heated. PP (polypropylene), PE (polyethylene), a silicon glass laminate, or the like can be used.

In this drying apparatus 10, the honeycomb formed body 12 is held in the furnace body 14, the mixing amount of superheated steam and dry air produced by heating the steam in the heating chamber 24 is adjusted, and the furnace body 14 is blown and dried in the cross-sectional direction of the honeycomb formed body 12 installed horizontally.

  Here, a heating element 40 is arranged inside the heating chamber 24, and an induction heating coil 42 made of a copper pipe wound in a spiral shape is installed on the outer periphery of the heating chamber 24.

  As the material of the heating chamber 24, for example, a fluororesin or quartz glass that is not heated by induction heating can be used.

  On the other hand, as the material of the heating element 40, a magnetic body that can be heated by induction heating is used. Further, as a material that is resistant to corrosion, for example, stainless alloy, Ni, Ni-Cr alloy, carbon ceramic, etc. preferable. Further, the heating element 40 is configured in a circular or rectangular mesh-like cylindrical body.

  A microwave supply port 14 c formed in the upper part of the furnace body 14 is connected to a microwave oscillator 34 through a waveguide 32. The microwave oscillator 34 generates a microwave having a frequency of 2450 MHz, and the microwave generated by the microwave oscillator 34 is irradiated into the furnace body 14 from the microwave supply port 14c through the waveguide 32. The honeycomb formed body 12 is heated by the wave irradiation.

  Further, as described above, the resin plate 36 made of a fluororesin or the like having a small loss coefficient with respect to the microwave is disposed in the microwave supply port 14c. The resin plate 36 transmits the microwave transmitted through the waveguide 32 and introduces it into the furnace body 14. On the other hand, a gas such as vapor in the furnace body 14 is introduced into the waveguide from the microwave supply port 14 c. 32 and into the microwave oscillator 34 are prevented.

  Here, since the honeycomb molded body 12 is held in the space of the furnace body 14 by the support columns 16, the microwaves that are irradiated into the furnace body 14 from the microwave supply port 14c and propagate through the inner wall of the furnace body 14 are: The entire honeycomb formed body 12 is irradiated.

Next, the mechanism for generating superheated steam in the heating chamber 24 will be described. First, when a high frequency current is passed through the induction heating coil 42 by the high frequency oscillator 44, magnetic lines are generated around the induction heating coil 42. An induced current (eddy current) is generated in 40. Since this induced current loses energy due to the resistance of the heating element 40, the heating element 40 generates heat. When the steam introduced from the steam generator 50 comes into contact with the heated heating element 40, the steam is heated and becomes superheated steam. Furthermore, since the heating element 40 has a mesh-like cylindrical body that penetrates, the contact area with the steam is large, and the heat exchange efficiency can be increased.

  The steam generator 50 stores water supplied from the water supply pipe 50 inside and heats it with the heater 54, like a boiler.

An operation process of drying the honeycomb formed body 12 using the drying apparatus 10 will be described with reference to FIG.

  First, a vapor irradiation step for preheating the honeycomb formed body 12 is performed (step of shifting from a to b in FIG. 2). In this steam irradiation step, the steam (saturated steam at about 100 ° C.) generated by the steam generator 50 is introduced into the furnace body 14 as it is without being heated in the heating chamber 24. This saturated steam has a function of humidifying the honeycomb formed body 12.

  That is, when the honeycomb formed body 12 is raised from room temperature to a drying temperature of about 100 ° C., if the hot air is raised from room temperature to a drying temperature of about 100 ° C., the honeycomb formed body 12 is deformed due to overdrying at this point. Will end up. Therefore, up to 100 ° C., only steam is introduced into the furnace body 14 by the operation of initial vaporization, and the honeycomb formed body 12 is heated to 100 ° C. in this step.

  At this time, dew condensation occurs in the interior of the furnace body 14 at the room temperature and on the surface of the honeycomb formed body 12. 18 will be absorbed. Since the temperature inside the furnace body 14 and the surface of the honeycomb formed body 12 rapidly rises due to latent heat of condensation, this process ends when equilibrium is reached.

  The equilibrium state can be observed using a thermometer 28 and a high-temperature hygrometer 30 installed in the exhaust duct 26, or can be confirmed in a dew condensation state.

Next, a drying step of the honeycomb formed body 12 is performed (step of shifting from b to c in FIG. 2). That is, the steam from the steam generator 50 is heated in the heating chamber 24 after the above-described steam irradiation process. Since the temperature of the steam rises, vapor goes from saturated steam to superheated steam (dry steam), thereby but such increases the temperature of the furnace body 14 for drying operations et honeycomb molded body 12.

  Here, the temperature of the superheated steam can be adjusted by the control of the high-frequency oscillator 44 and can be confirmed by a thermometer 28 installed in the exhaust duct 26.

The humidity of the superheated steam is set to a desired humidity by controlling the amount of dry air supplied from the dry air supplier 56 and adjusting the amount of superheated steam and dry air mixed in the furnace body 14. can do. The control of the supply amount of the dry air, the valve 58 is performed by using the flow meter 60 and the regulator over 62 can be confirmed at a high temperature hygrometer 30 installed in the exhaust duct 26.

  In this drying step, if microwaves are irradiated, the honeycomb molded body 12 is also heated from the inside, so that drying can proceed faster.

  Further, in the operation of this drying step, the same operation as the above-described vapor irradiation step is repeated as appropriate. That is, as the drying process proceeds, a moisture content gradient on the surface of the honeycomb formed body 12 starts to occur (stress generation), so heating in the heating chamber 24 is stopped and steam is again introduced into the furnace body 14. And the operation | movement similar to a vapor | steam irradiation process is repeatedly performed during the operation | work of this drying process, and the moisture content of the honeycomb molded object 12 surface is lowered | hung to a target moisture content.

  When the above drying process is completed, the ratio of dry air to steam is gradually increased (the process of shifting from FIG. 2c to d), the temperature is lowered while obtaining the minimum humidity, and the drying apparatus 10 is operated. To complete.

  As described above, by using this drying apparatus 10, the honeycomb formed body can be uniformly dried without causing defects such as wrinkles and warpage, and without causing cell deformation.

The above-described embodiment can be modified as shown in the following (1) to (4).

  (1) In the above-described embodiment, the number of struts 16 is not limited, and may be one, or may be two or more, and the size of the internal space of the furnace body 14 or drying. An appropriate number may be formed according to the size of the target honeycomb formed body 12 and the like.

  (2) In the above embodiment, the steam generator has the same structure as the boiler. However, the steam generator is not limited to this, and various known steam generators can be used. Steam generating means can be used.

  (3) In the above-described embodiment, the steam generated in the steam generator 50 is supplied to the heating chamber 24 to form superheated steam, and this superheated steam is introduced into the furnace body 14, and at the same time, microwaves are similarly applied to the furnace body. Although the honeycomb formed body 12 is dried by irradiating the inside of the furnace 14, the present invention is not limited to this. Of course, the inside of the furnace body 14 is not irradiated with microwaves. Drying may be performed.

  (4) You may make it combine suitably the embodiment shown above and the modification shown in said (1)-(3).

  The present invention includes purification of drainage and clean water, microfiltration of industrial process water and air, sterilization in the field of pharmaceutical production and cosmetics production, clarification filtration of solutions, foods and beverages, gas separation, etc. In addition, it can be used in a drying process when manufacturing a honeycomb formed body used in various fields.

FIG. 1 is an explanatory diagram of a conceptual configuration of a drying apparatus according to an example of an embodiment of the present invention. FIG. 2 is an explanatory view showing an operation process of the drying apparatus according to an example of the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drying device 12 Honeycomb forming body 12a Hole part 12b Side surface 14 Furnace body 14a Superheated steam supply port 14b Exhaust port 14c Microwave supply port 14d Drain port 16 Strut 18 Elastic member 20 Current plate 22 Pipe 24 Heating chamber 24a End part 24b End part 26 Exhaust Duct 28 Thermometer 30 High Temperature Hygrometer 32 Waveguide 34 Microwave Oscillator 36 Resin Plate 38 Punching Plate 40 Heating Element 42 Induction Heating Coil 42a End 42b End 44 High Frequency Oscillator 46 Pipe 48 Valve 50 Steam Generator 52 Water supply pipe 54 Heater 56 Dry air supply 58 Valve 60 Flow meter 62 Regulator 64 Furnace door 66 Packing

Claims (11)

In a drying apparatus for drying a honeycomb formed body,
A furnace body containing the honeycomb formed body therein;
Superheated steam generating means for heating the saturated steam to generate superheated steam and supplying the generated superheated steam into the furnace body;
Dry air supply means for supplying dry air into the furnace body;
Control means for controlling the amount of dry air supplied to the furnace by the dry air supply means,
The control means adjusts the mixing amount of the superheated steam generated and supplied by the superheated steam generation means and the dry air supplied by the dry air supply means in the furnace body, and is accommodated in the furnace body. A drying apparatus characterized by spraying superheated steam and dry air whose mixing amount is adjusted to the honeycomb formed body. In a drying apparatus for drying a honeycomb formed body,
A furnace body containing the honeycomb formed body therein;
Superheated steam generating means for generating superheated steam and supplying it into the furnace body;
Dry air supply means for supplying dry air to the furnace body;
Control means for controlling the amount of dry air supplied to the furnace by the dry air supply means;
Have
The control means adjusts the mixing amount in the furnace body of the superheated steam generated and supplied by the superheated steam generation means and the dry air supplied by the dry air supply means, and is accommodated in the furnace body. Further, the superheated steam and dry air whose mixing amount is adjusted are sprayed on the honeycomb formed body,
The furnace body has a baffle plate and is disposed at one end portion in the horizontal direction, and the superheated steam and dry air whose mixing amount is adjusted from the superheated steam generation means and the dry air supply means. A superheated steam supply port to be supplied; an exhaust port disposed opposite to the superheated steam supply port at the other end in the horizontal direction; and a drain port disposed below and having a punching plate.
A drying apparatus characterized by that. The drying apparatus according to any one of claims 1 and 2 ,
The superheated steam generating means is
Steam generating means for generating saturated steam;
Heating means for heating the saturated steam generated by the steam generation means,
The furnace body, the heating means and the steam generating means are sequentially arranged in series,
Drying apparatus is characterized in that dry air is supplied by the dry air supply means between the heating means and the steam generation means. The drying apparatus according to claim 3,
The heating means includes
A heating chamber to which saturated steam generated by the steam generating means is supplied;
A heating element disposed in the heating chamber;
An induction heating coil disposed on the outer periphery of the heating chamber;
A drying apparatus comprising: a high-frequency oscillator that supplies a high-frequency current to the induction heating coil. The drying apparatus according to claim 4 , wherein
The heating device is made of a stainless steel alloy, Ni, Ni-Cr alloy, titanium, or carbon ceramic, which is a magnetic material, and has a mesh-like cylindrical shape penetrating. The drying apparatus according to any one of claims 1 , 2, 3, 4 or 5 ,
Drying apparatus characterized by having a microwave irradiating means for irradiating by supplying microwaves to the oven body. The drying apparatus according to claim 6 , wherein
The furnace body further includes:
A drying apparatus characterized by having a microwave supply port which is disposed above and to which microwaves are supplied by the microwave irradiation means. The drying apparatus according to claim 7 ,
The microwave irradiation means includes
A waveguide connected to the microwave supply port;
And a microwave oscillator connected to the waveguide. The drying apparatus according to any one of claims 1, 3 , 4 , 5 , 6 , 7, or 8 .
The furnace body is
A superheater that has a current plate and is disposed at one end in the horizontal direction and that is supplied with superheated steam and dry air whose mixing amount is adjusted from the superheated steam generation means and the dry air supply means A steam supply port;
An exhaust port disposed opposite to the superheated steam supply port at the other end in the horizontal direction;
A drying apparatus, comprising: a drainage port disposed below and having a punching plate. The drying apparatus according to any one of claims 2 and 9 ,
An exhaust duct connected to the exhaust port;
A drying apparatus, wherein a thermometer and a high-temperature hygrometer are installed in the exhaust duct. The drying apparatus according to any one of claims 1, 2 , 3 , 4 , 5 , 6, 7, 8, 9 or 10 .
A support column erected on the inner peripheral surface of the furnace body;
An elastic member disposed on the column,
The drying apparatus, wherein the honeycomb formed body is held in the space of the furnace body by the support through the elastic member.

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