JP2010143964A - Carbonization apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbonization apparatus which can prevent a distillation gas from leaking from a carbonization furnace by a simple structure. <P>SOLUTION: The carbonization apparatus has the carbonization furnace 21 to which a mixture is supplied, a conveyor shaft 26 penetrating the carbonization furnace 21, and a bearing 24 provided in the carbonization furnace 21 for rotatably supporting the conveyor shaft 26, and carbonizes the mixture inside a furnace body 22 of the carbonization furnace 21 while conveying it. The bearing 24 is provided with a chamber 245 to which a sealing gas is supplied from outside the carbonization furnace 21, and the chamber 245 is provided with a space 247 connecting its inside to the inside of the furnace body 22. The carbonization furnace 21 is provided with a distillation gas discharge part for discharging the sealing gas, introduced into the inside of the furnace body 22 through the space 247, outside the furnace body 22 when the sealing gas is supplied to the inside of the chamber 245 to render the inside pressure of this chamber 245 higher than that of the furnace body 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a carbonization apparatus and a carbonization method. More specifically, the present invention relates to a carbonization apparatus and a carbonization method for carbonizing a mixture such as paint slag and drainage sludge discharged as waste in a vehicle body painting process.

  Conventionally, waste such as drainage sludge is discharged from the body factory, and waste such as paint soot and chemical sludge is discharged in the body painting process. In recent years, the waste discharged in the painting process or the like has been reused as a material for, for example, automobile parts after undergoing a reprocessing process.

  The waste reprocessing process consists of a pretreatment process in which crushed paint cake is mixed with wastewater sludge and chemical sludge to produce a paint mixture, a carbonization process in which the produced paint mixture is carbonized to produce carbide. And a pulverization step of pulverizing the carbide.

  As a carbonization apparatus used in the carbonization process, for example, a superheated steam type is known. This superheated steam type carbonization apparatus includes a carbonization furnace to which a coating mixture is supplied and a transfer shaft provided through the inside of the carbonization furnace, and rotates the transfer shaft to The coating mixture is carbonized by supplying superheated steam to the inside of the carbonization furnace while conveying the coating mixture.

  By the way, in such a carbonization apparatus, although the inside of the carbonization furnace is basically sealed, a slight gap is formed between the conveyance shaft and the bearing portions that support both ends of the conveyance shaft. . If dry distillation gas filled inside the carbonization furnace leaks to the outside of the carbonization furnace, the working environment may deteriorate, so it is necessary to prevent the gas inside the carbonization furnace from leaking from such a gap. is there.

For example, Patent Document 1 and Patent Document 2 propose a technique for preventing gas from leaking out of the furnace through the gap by supplying gas from outside the furnace to a space including the gap as described above. Has been. In particular, in the technique disclosed in Patent Document 2, it is possible to prevent gas from leaking out of the furnace by providing a pressurized chamber partitioned with a plurality of packings and supplying the gas into the pressurized chamber. Prevent it.
Japanese Patent No. 3426638 Japanese Utility Model Publication No. 6-36477

  However, when the technology for preventing gas leakage as described above is applied to the bearing portion of the conveying shaft of the carbonization furnace, a large number of seal members such as packings are required, which may complicate the structure. Further, when the seal member is deteriorated, there is a possibility that gas in the furnace leaks.

  An object of the present invention is to provide a carbonization apparatus that can prevent dry distillation gas from leaking from a carbonization furnace with a simple structure.

  The carbonization apparatus (for example, a carbonization apparatus 20 described later) of the present invention includes a carbonization furnace (for example, a carbonization furnace 21 and a furnace body 22 described later) supplied with a mixture (for example, a coating mixture described later), and the carbonization. A transfer shaft (for example, a transfer shaft 26 described later) that passes through the furnace and transfers the mixture inside the carbonization furnace, and a bearing portion that is provided in the carbonization furnace and rotatably supports the transfer shaft (for example, described later). Bearing parts 24, 25), and carbonizing the mixture while conveying the mixture inside the carbonization furnace. The bearing portion is provided with a chamber (for example, a chamber 245 described later) to which seal gas (for example, saturated steam generated in a boiler 31 described later) is supplied from the outside of the carbonization furnace. A gap portion (for example, a gap portion 247 described later) communicating between the inside of the chamber and the inside of the carbonization furnace is provided, and a sealing gas is supplied to the inside of the chamber so that the inside of the chamber is filled with the inside of the chamber. When the pressure is higher than the inside of the carbonization furnace, a discharge part that discharges the seal gas introduced into the carbonization furnace through the gap portion to the outside of the carbonization furnace (for example, a dry distillation gas discharge part 222 described later) ) Is provided.

According to the present invention, the chamber is provided in the bearing portion that supports the conveyance shaft, and further, the gap portion that communicates the inside with the inside of the carbonization furnace is provided in the chamber.
Here, when a seal gas is supplied from the outside of the carbonization furnace to the inside of the chamber and the inside of the chamber is set to a pressure higher than that of the inside of the carbonization furnace, the gap is formed from the inside of the chamber toward the inside of the carbonization furnace. Seal gas circulates. Thereby, it is possible to prevent the dry distillation gas generated when the mixture is carbonized inside the carbonization furnace from leaking out of the carbonization furnace through the gap.
Moreover, according to this invention, the seal gas introduced into the inside of the carbonization furnace is discharged to the outside of the carbonization furnace through the discharge portion provided in the carbonization furnace. Accordingly, the inside of the chamber can be kept at a higher pressure than the inside of the carbonization furnace, and the dry distillation gas can be prevented from leaking out of the carbonization furnace.

  In this case, the chamber is formed with an insertion hole (for example, an insertion hole 246 described later) through which the transport shaft is inserted, and the gap portion is formed between the outer peripheral surface of the transport shaft and the inner peripheral surface of the insertion hole. It is preferable that the gaps are uniformly formed therebetween, and the volume of the chamber is sufficiently large with respect to the gaps. More specifically, the volume of the chamber is preferably sufficiently large with respect to the gap so that the pressure inside the chamber becomes uniform.

According to the present invention, a uniform gap is formed between the outer peripheral surface of the transport shaft and the inner peripheral surface of the insertion hole through which the transport shaft is inserted, and this is defined as a gap portion. That is, the seal gas supplied to the inside of the chamber flows into the carbonization furnace through a gap formed uniformly on the outer peripheral surface of the transport shaft. In particular, here, by forming the gap portion uniformly as described above, it is possible to prevent the drift of the seal gas in the gap portion and improve the sealing force by the seal gas.
In addition, by making the volume of the chamber sufficiently large with respect to the gap so that the pressure inside the chamber is uniform, pressure is uniformly applied to the entire circumference of the gap between the transfer shaft and the insertion hole. Can do. Thereby, the drift of the seal gas in the gap can be further prevented.

  The carbonization method of the present invention includes a carbonization furnace (for example, a carbonization furnace 21 to be described later) supplied with a mixture (for example, a coating mixture to be described later) and the carbonization furnace, and the mixture is conveyed inside the carbonization furnace. A carbonizing apparatus including a conveying shaft (for example, a conveying shaft 26 described later) and a bearing portion (for example, bearing portions 24 and 25 described later) that are provided in the carbonization furnace and rotatably support the conveying shaft. (For example, the carbonization apparatus 20 described later) is used to carbonize the mixture while conveying the mixture inside the carbonization furnace. The bearing portion is provided with a chamber (for example, a chamber 245 described later) to which a seal gas is supplied from the outside of the carbonization furnace. The chamber communicates with the inside of the chamber and the inside of the carbonization furnace. A gap (for example, a gap 247 described later) is provided. In the carbonization method, when carbonizing the mixture inside the carbonization furnace, a seal gas is supplied to the inside of the chamber so that the inside of the chamber has a higher pressure than the inside of the carbonization furnace, and the gap is formed through the gap. A seal gas is introduced from the inside of the chamber into the carbonization furnace, and the seal gas inside the carbonization furnace is discharged to the outside through a discharge unit provided in the carbonization furnace.

  This carbonization method is a development of the above-mentioned carbonization apparatus as a method invention, and has the same effect as the above-mentioned carbonization apparatus.

  According to the carbonization apparatus of the present invention, when sealing gas is supplied from the outside of the carbonization furnace to the inside of the chamber and the inside of the chamber is set to a pressure higher than the inside of the carbonization furnace, the inside of the chamber is directed from the inside of the chamber to the inside of the carbonization furnace. The seal gas circulates through the gap. Thereby, it is possible to prevent the dry distillation gas generated when the mixture is carbonized inside the carbonization furnace from leaking out of the carbonization furnace through the gap. Further, the seal gas introduced into the carbonization furnace is discharged to the outside of the carbonization furnace through a discharge unit provided in the carbonization furnace. Accordingly, the inside of the chamber can be kept at a higher pressure than the inside of the carbonization furnace, and the dry distillation gas can be prevented from leaking out of the carbonization furnace.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a reprocessing system RS using the carbonization apparatus according to the present embodiment.
The reprocessing system RS includes a crusher S1 and a mixer S2 that perform a pretreatment process, a preliminary dryer S3 that performs a carbonization process, a carbonization system S4, a cooling device S5, a magnetic separator S6 that performs a pulverization process, and a mill. S7 and sieve S8 are comprised. The reprocessing system RS reprocesses, for example, wastewater sludge generated from a car body factory, waste such as paint slag and chemical sludge generated in the process of painting the car body with the devices S1 to S8, To produce a carbide.

  In the pretreatment process, first, the paint cake stored in the container or the like is crushed to a required size by the crusher S1. Next, the crushed paint cake, wastewater sludge and chemical sludge are mixed at a predetermined mixing ratio by the mixer S2 to produce a coating mixture. Hereinafter, this coating mixture is simply referred to as a mixture.

  In the carbonization step, first, a mixture containing a large amount of water is preliminarily dried by the predryer S3. Next, the pre-dried mixture is carbonized by the carbonization system S4 to generate a carbide. Next, the produced carbide is cooled by the cooling device S5.

  In the pulverization step, first, iron is removed from the generated carbide using the magnetic separator S6. Next, the carbide is pulverized by a mill S7. Further, the finely divided carbide is passed through a sieve S8, and the generated carbide is classified. The carbide generated as described above is shipped, for example, as a substitute material for calcium carbide blended in the vibration-proof material.

FIG. 2 is a schematic diagram showing the configuration of the carbonization system S4.
The carbonization system S4 includes a drying device 10 and a carbonization device 20, and a superheated steam generation unit 30 that generates superheated steam. The carbonization system S4 is of a so-called superheated steam type in which a mixture is carbonized using superheated steam generated by the superheated steam generation unit 30 to generate a carbide. In addition, in FIG. 2, the direction of the flow of the mixture and the carbide | carbonized_material produced | generated from this mixture is shown by the white arrow.

  The superheated steam generating unit 30 includes a boiler 31 that generates saturated steam and a heater 32 provided with a burner 33.

Saturated steam generated in the boiler 31 through the pipe 44 and exhaust gas discharged from the drying apparatus 10 and the carbonization apparatus 20 through the pipe 46 are introduced into the heater 32.
The heater 32 further heats the saturated steam introduced through the pipe 44 in an atmosphere in which a combustible gas such as LPG is burned by the burner 33 to generate superheated steam. At the same time, the heater 32 burns the exhaust gas introduced through the pipe 46 together with the combustible gas in the burner 33, and deodorizes and raises the temperature of the exhaust gas. The superheated steam generated by the heater 32 is supplied to the carbonization device 20 via the pipe 45. In addition, the exhaust gas deodorized and heated by the heater 32 is supplied to the carbonization apparatus 20 through the pipe 47 as a heated gas.

  The pipe 44 is provided with a branch pipe 48 that leads to bearings 24 and 25 (to be described later) of the carbonization apparatus 20. Thereby, a part of the saturated steam generated in the boiler 31 is supplied to these bearing portions 24 and 25 as seal gas.

  The drying apparatus 10 includes a drying furnace 11 to which the mixture is supplied, and a transport shaft 16 that passes through the drying furnace 11 and transports the mixture inside the drying furnace 11, and transports the mixture inside the drying furnace 11. This mixture is then dried.

The drying furnace 11 includes a cylindrical furnace body 12, an outer peripheral portion 13 that covers the outer periphery of the furnace body 12, and bearing portions 14 and 15 that rotatably support the conveyance shaft 16 from both ends. The
The above-mentioned pre-dried mixture is supplied to the bearing portion 14 side in the furnace body 12 through a supply pipe (not shown).

  The outer peripheral portion 13 has a jacket structure, that is, a double structure, and a high-temperature heated gas flows through the inside. A heated gas discharged from the carbonization apparatus 20 is introduced into the outer peripheral portion 13 through a pipe 41. Thereby, the furnace body 12 and the inside thereof are heated to a predetermined temperature. Further, the heated gas that circulates inside the outer peripheral portion 13 and is used to heat the furnace body 12 is discharged to the outside through the pipe 42.

  The transport shaft 16 is a screw conveyor that includes a shaft body 17 extending over both ends of the drying furnace 11 and screw blades 18 provided on the outer periphery of the shaft body 17. Further, the end of the transport shaft 16 on the bearing 14 side is connected to a motor 19.

  Here, when the motor 19 is driven to rotate the conveyance shaft 16, the mixture supplied to the bearing portion 14 side in the furnace body 12 is moved to the bearing portion 15 side while being stirred by the screw blades 18 inside the furnace body 12. Be transported. The mixture is gradually dried during this transport process. Further, the gas generated in the furnace body 12 in the process of drying the mixture is recovered as exhaust gas in the superheated steam generation unit 30 through the pipe 46 and deodorized by the above-described procedure. The mixture dried in the furnace body 12 as described above is supplied to the carbonization apparatus 20 through a feeder (not shown).

  The carbonization apparatus 20 includes a carbonization furnace 21 to which a mixture is supplied, and a conveyance shaft 26 that passes through the carbonization furnace 21 and conveys the mixture inside the carbonization furnace 21. The carbonization apparatus 20 carbonizes the mixture while conveying the mixture inside the carbonization furnace 21.

  The carbonization furnace 21 includes a cylindrical furnace body 22, an outer peripheral portion 23 that covers the outer periphery of the furnace body 22, and bearing portions 24 and 25 that rotatably support the transport shaft 26 from both ends. The

  The mixture dried by the drying device 10 is supplied to the bearing portion 24 side in the furnace body 22. On the bearing section 24 side of the furnace body 22, a superheated steam introduction section 221 that connects the pipe 45 and introduces the superheated steam generated by the superheated steam generation unit 30 into the furnace body 22 is provided. Further, a dry distillation gas discharge part 222 for connecting a pipe 49 to discharge the gas inside the furnace body 22 to the outside is provided on the bearing part 25 side of the furnace body 22.

  The outer peripheral portion 23 has a jacket structure similar to that of the drying furnace 11 described above, and high-temperature heated gas flows through the inside. Heat gas discharged from the superheated steam generation unit 30 is introduced into the outer peripheral portion 23 through a pipe 47. Thereby, the furnace body 22 and the inside thereof are heated to a predetermined temperature. Further, the heated gas that circulates inside the outer peripheral portion 23 and is used to heat the furnace body 22 is supplied to the outer peripheral portion 13 of the drying furnace 11 through the pipe 41.

  The conveying shaft 26 is a screw conveyor configured to include a shaft main body 27 extending over both ends of the carbonization furnace 21 and screw blades 28 provided on the outer periphery of the shaft main body 27. Further, the end of the transport shaft 26 on the bearing portion 24 side is connected to a motor 29.

FIG. 3 is a partial cross-sectional view schematically showing the configuration of the bearing portion 24 of the carbonization apparatus 20.
The bearing portion 24 is in sliding contact with the outer peripheral surface of the conveyance shaft 26 and supports a radial bearing 242 that rotatably supports the conveyance shaft 26, a holding case 241 to which the radial bearing 242 is fixed, a radial bearing 242, and a holding case 241. And a packing 243 that seals a gap therebetween.

  The holding case 241 has a substantially cylindrical shape, is fixed to an end portion of the furnace body, and divides the inside and the outside of the furnace body. That is, in FIG. 3, the right side of the holding case 241 is the inner side of the furnace body, and the left side of the holding case 241 is the outer side of the furnace body.

  A substantially disc-shaped chamber partition plate 244 is fixed to the inside of the holding case 241. Thus, an annular chamber 245 that covers a part of the outer peripheral portion of the transport shaft 26 is formed by the radial bearing 242, the holding case 241, and the chamber partition plate 244.

  An insertion hole 246 through which the transport shaft 26 is inserted is formed in the chamber partition plate 244. The inner periphery of the insertion hole 246 is formed larger than the outer periphery of the transport shaft 26. As a result, a gap communicating between the inside of the chamber 245 and the inside of the furnace body is uniformly formed over the entire circumference of the transport shaft 26 between the inner peripheral surface of the insertion hole 246 and the outer peripheral surface of the transport shaft 26. Is done. Hereinafter, this gap is referred to as a gap portion 247.

  The holding case 241 is provided with a seal gas supply unit 248 communicating with the inside of the chamber 245. A pipe 48 (see FIG. 2) is connected to the seal gas supply unit 248. As a result, the seal gas generated in the superheated steam generation unit 30 is supplied into the chamber 245.

  Here, the volume of the chamber 245 is sufficiently larger than the gap 247 so that the pressure inside the chamber 245 is uniform. Therefore, by supplying the seal gas to the chamber 245, the pressure inside the chamber 245 is kept higher than the inside of the furnace body, and the gap between the outer peripheral surface of the transport shaft 26 and the inner peripheral surface of the insertion hole 246 is maintained. It is possible to apply pressure uniformly over the entire circumference of the gap. When the seal gas is supplied into the chamber 245 in this way, the seal gas always flows from the inside of the chamber 245 to the inside of the furnace body through the gap portion 247.

  Thereby, as shown by the white arrow in FIG. 3, it is possible to prevent the dry distillation gas generated inside the furnace body 22 from leaking from the inside of the furnace body through the gap portion 247. That is, the gap between the bearing portion 24 and the conveyance shaft 26 can be sealed. Further, the seal gas supplied to the inside of the furnace body in this way is supplied to the outside of the furnace body together with the dry distillation gas generated during the carbonization of the mixture via the dry distillation gas discharge unit 222 (see FIG. 2). To be discharged.

  Here, by using saturated steam as the seal gas, the mixture in the furnace body does not burn, so that high-quality carbide can be generated. Moreover, the consumption of energy required for reprocessing can be reduced by diverting the saturated steam generated by the boiler to generate superheated steam as the saturated steam.

  Although a detailed description is omitted, the bearing portion 25 has a chamber formed in the same manner as the bearing portion 24, and a seal gas is introduced into the chamber via the seal gas supply portion 258 (see FIG. 2). It is possible to seal between the bearing portion 25 and the conveyance shaft 26.

  Returning to FIG. 2, when the motor 29 is driven to rotate the conveyance shaft 26, the mixture supplied to the bearing portion 24 side inside the furnace body 22 is stirred by the screw blades 28 inside the furnace body 22 and the bearing portion. It is transported to the 25 side and gradually carbonizes. More specifically, the mixture is received in the process of being transported in the heated furnace body 22 by receiving thermal energy of the furnace wall of the furnace body 22 using the superheated steam introduced from the superheated steam introducing portion 221 as a medium. Thermally decomposes and gradually carbonizes.

  Further, in the process of carbonizing the mixture in this way, dry distillation gas is generated and filled in the furnace body 22. Therefore, when carbonizing the mixture, as described above, the seal gas is supplied to the inside of the chambers of the bearing portions 24 and 25, and the inside of the chamber is made to have a higher pressure than the inside of the furnace body 22, thereby the gap portion. A seal gas is introduced into the furnace body 22 via the. Thereby, it is possible to prevent the dry distillation gas from leaking from the inside of the furnace body 22 through the gap between the bearing portions 24 and 25 and the transport shaft 26.

  Here, as described above, the seal gas supplied to the inside of the furnace body 22 is discharged from the dry distillation gas discharge unit 222 to the outside of the furnace body 22 together with the dry distillation gas generated in the process of carbonizing the mixture. Moreover, the gas discharged | emitted from the dry distillation gas discharge part 222 is collect | recovered by the superheated steam generation unit 30 via the piping 49 and 46, and is deodorized by the above-mentioned procedure.

According to this embodiment, there are the following effects.
(1) According to the present embodiment, the chambers 245 are provided in the bearing portions 24 and 25 that support the transport shaft 26, and further, the gap portion 247 that communicates the inside with the inside of the furnace body 22 is provided in the chamber 245. It was.
Here, when a sealing gas is supplied from the outside of the carbonization furnace 21 to the inside of the chamber 245 and the inside of the chamber 245 is set to a pressure higher than that of the inside of the furnace body 22, the inside of the chamber 245 is directed to the inside of the furnace body 22. Thus, the seal gas flows through the gap portion 247. Thereby, it is possible to prevent dry distillation gas generated when carbonizing the mixture inside the carbonization furnace 21 from leaking outside the carbonization furnace 21 through the gap 247.
Further, according to the present embodiment, the seal gas introduced into the carbonization furnace 21 is discharged to the outside of the carbonization furnace 21 through the dry distillation gas discharge unit 222 provided in the carbonization furnace 21. Thereby, the inside of the chamber 245 can be maintained at a higher pressure than the inside of the carbonization furnace 21, and the dry distillation gas can be prevented from leaking out of the carbonization furnace 21.
Further, according to the present embodiment, for example, even when a seal member such as the packing 243 provided in the bearing portion 24 contracts or wears, the pressure inside the chamber 245 is set inside the furnace body 22. By keeping the pressure higher than the pressure, it is possible to prevent the dry distillation gas from leaking from the gap between the packings 243.

  (2) According to the present embodiment, a uniform gap is formed between the outer peripheral surface of the transport shaft 26 and the inner peripheral surface of the insertion hole 246 through which the transport shaft 26 is inserted, and this is defined as the gap portion 247. That is, the seal gas supplied into the chamber 245 flows into the furnace body 22 through the gap 247 formed uniformly on the outer peripheral surface of the transport shaft 26. In particular, here, by forming the gap portion 247 uniformly as described above, the drift of the seal gas in the gap portion 247 can be prevented, and the sealing force by the seal gas can be improved.

FIG. 4 is a partial cross-sectional view schematically showing the configuration of the bearing portion 24A of the carbonizing apparatus 20A of a comparative example with respect to the present embodiment.
As shown in FIG. 4, when the volume of the chamber 245A is smaller than the gap portion 247, the pressure in the vicinity of the seal gas supply unit 248 is increased inside the chamber 245A, and the drift of the seal gas occurs. There is a fear. According to the present embodiment, the gap between the transport shaft 26 and the insertion hole 246 is increased by sufficiently increasing the volume of the chamber 245 with respect to the gap 247 so that the pressure inside the chamber 245 is uniform. The pressure can be uniformly applied to the entire circumference of the. Thereby, the drift of the seal gas in the clearance 247 can be further prevented.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the said embodiment, although the screw conveyor provided with the screw blade | wings 18 and 28 was used as the conveying shafts 16 and 26 of the drying apparatus 10 and the carbonization apparatus 20, it is not restricted to this. For example, a paddle conveyor having a plurality of paddles may be used as the transport shaft.

It is a block diagram which shows the structure of the reprocessing system using the carbonization apparatus which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the carbonization system which concerns on the said embodiment. It is a fragmentary sectional view which shows typically the structure of the bearing part of the carbonization apparatus which concerns on the said embodiment. It is a fragmentary sectional view which shows typically the structure of the bearing part of the carbonization apparatus which concerns on a comparative example.

Explanation of symbols

RS ... Reprocessing system S4 ... Carbonization system 20 ... Carbonization apparatus 21 ... Carbonization furnace 22 ... Furnace body 221 ... Superheated steam introduction part 222 ... Dry distillation gas discharge part 24, 25 ... Bearing part 248, 258 ... Seal gas supply part 244 ... Chamber Partition plate 245 ... Chamber 246 ... Insertion hole 247 ... Gap 26 ... Conveying shaft 30 ... Superheated steam generation unit

Claims (3)

A carbonization furnace supplied with the mixture;
A conveying shaft that penetrates the carbonization furnace and conveys the mixture inside the carbonization furnace;
A carbonization apparatus provided in the carbonization furnace and comprising a bearing portion that rotatably supports the transport shaft, and carbonizing the mixture while transporting the mixture inside the carbonization furnace,
The bearing portion is provided with a chamber to which a seal gas is supplied from the outside of the carbonization furnace,
The chamber is provided with a gap that communicates the interior of the chamber and the interior of the carbonization furnace,
When the sealing gas is supplied to the inside of the chamber and the inside of the chamber is set to a pressure higher than that of the inside of the carbonizing furnace, the seal introduced into the inside of the carbonizing furnace through the gap portion. The carbonization apparatus characterized by being provided with the discharge part which discharges | emits gas to the exterior of the said carbonization furnace. The chamber is formed with an insertion hole through which the transport shaft is inserted,
The gap portion is a gap formed uniformly between the outer peripheral surface of the transport shaft and the inner peripheral surface of the insertion hole,
The carbonization apparatus according to claim 1, wherein a volume of the chamber is sufficiently larger than the gap portion. A carbonization furnace supplied with the mixture;
A conveying shaft that penetrates the carbonization furnace and conveys the mixture inside the carbonization furnace;
A carbonization method for carbonizing the mixture while conveying the mixture inside the carbonization furnace, using a carbonization apparatus provided in the carbonization furnace and rotatably supporting the conveyance shaft,
The bearing portion is provided with a chamber to which a seal gas is supplied from the outside of the carbonization furnace,
The chamber is provided with a gap that communicates the interior of the chamber and the interior of the carbonization furnace,
When carbonizing the mixture inside the carbonization furnace, a seal gas is supplied to the inside of the chamber so that the inside of the chamber has a pressure higher than that of the inside of the carbonization furnace, and from the inside of the chamber through the gap. A carbonization method characterized by introducing a seal gas into the carbonization furnace and discharging the seal gas inside the carbonization furnace to the outside through a discharge unit provided in the carbonization furnace.

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