JP2010070661A - Carbonizing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carbonizing apparatus having a simple structure and high thermal efficiency, completing carbonization of a carbonizing material having small size or poor thermal conductivity in a short time by high combustion efficiency and giving a high-quality carbonized product free from uneven carbonization by uniform progress of the carbonization in a whole furnace. <P>SOLUTION: The carbonizing apparatus is provided with a carbonizing furnace F comprising a furnace body 1 having an ignition port 11 and an air introducing port 12 having adjustable aeration rate at a bottom side of the body, a lid plate 2 and an exhaust pipe 3 placed in the furnace body 1. The exhaust pipe 3 in the furnace comprises a central heat-releasing cylinder 31 erected at the center of the furnace body, a plurality of circumferential heat-releasing cylinders 32 and branched pipes 33 connecting the upper end of the central heat-releasing cylinder 31 to the upper ends of individual circumferential heat-releasing cylinders 32. In the case of carbonizing the carbonizing material M charged into the furnace body 1 by spontaneous combustion of the material in an oxygen deficient state, generated combustion gas G flows into the central heat-releasing cylinder 31 through an exhaust gas G introducing hole 31a, ascends in the central heat-releasing cylinder 31 and descends in the circumferential heat-releasing cylinders 32. The carbonizing material M in the furnace body 1 is heated by the heat released in the above procedures. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a carbonization apparatus for carbonizing a variety of organic raw materials such as pulverized products of wood and bamboo, pellets, chips, shavings, and the like by spontaneous combustion in an oxygen-deficient state.

  In recent years, charcoal, including charcoal, has attracted attention for its excellent properties such as humidity control, deodorization, negative ion release, harmful substance adsorption, antifungal properties, and mite resistance. It is placed under the floor, placed in a rice cooker, or immersed in drinking water or bath water. In addition, products that have been crushed or pulverized into various building materials, joinery, tatami mats, etc., and those that are placed inside bedding, such as futons, are also commercialized and used for soil modification. Applications are expanding in various fields, such as mixing with resin and ceramic materials, and the demand is increasing.

  However, charcoal produced by a classic charcoal kettle is dense and hard as represented by Bincho charcoal, so it is unsuitable for applications such as deodorizers, adsorbents, or soil conditioners, and is also suitable for production. It took time and effort, and it was difficult to mass-produce. In addition, it was limited in terms of raw materials and was expensive, and there was a problem that the location of the kettle was greatly restricted.

  Therefore, the present inventor firstly established a carbonization heating cylinder with a hot air introduction hole in the lower part at the center of the furnace main body, with the upper side as a material inlet / outlet with an open / close lid as a carbonization device. In addition, an external exhaust pipe is connected to the upper end side of the furnace body through a crossing cylinder, and an air intake is provided at the bottom of the furnace body (Patent Document 1). As a further improved carbonization apparatus, instead of the carbonization heating cylinder, an outer cylinder having an exhaust introduction hole communicating with the furnace space in the lower part and closed at the upper part, and concentrically disposed in the outer cylinder And what provided the double cylinder-shaped exhaust heating cylinder which consists of an inner cylinder connected to the exhaust path to the exterior of a furnace is also proposed (patent document 2).

  In the former carbonization apparatus, the carbonization material loaded in the furnace body is ignited from the bottom side and spontaneously combusts in an oxygen-deficient state. The material for carbonization is heated and decomposed by the hot air rising from below and the heat dissipated from the red-hot carbonization heating cylinder to the surroundings, and further reaches the self-combustion temperature and spontaneously combusts. The increase in the combustion gas accompanying the expansion of the region brings about a synergistic effect of increasing the temperature of the heating cylinder for carbonization and increasing the heat radiation, and thus the carbonization of the carbonization material is remarkably promoted. In the latter improved type carbonization apparatus, the high-temperature combustion exhaust gas generated by the spontaneous combustion of the carbonizing material goes up and down in the double cylinder exhaust heating cylinder and goes out of the furnace. High heat efficiency can be obtained by increasing the amount of heat transfer from the exhaust gas to the heated exhaust stack, and red heat generation due to heat accumulation in the entire heated exhaust stack proceeds rapidly. The thermal decomposition and spontaneous combustion of the construction material are further promoted, and the time required for complete carbonization is further shortened.

Therefore, these carbonization devices have many advantages that they can mass-produce soft, extinguished charcoal that is excellent in deodorizing performance and adsorption performance in a short time, and that are structurally simple and not restricted by installation location. Therefore, it has already been put to practical use and has been well received.
JP 2003-119468 A Japanese Patent No. 4017556

  The carbonization material used in the carbonization apparatus has been mainly the size of several centimeters to several tens of centimeters of wood or bamboo chips in the past, but recently, thinned and thinned bamboo materials have been crushed, In general, there are many fine items of 10 mm or less, such as pellets formed by pressing from sawdust. This is because a smaller particle size is easier to use when turning carbide into fuel, mixing it with other materials, or mixing it with soil as a soil modifier.

  However, if the size of the carbonizing material is reduced, the material density increases when it is loaded into the carbonization furnace, so that the amount of air present in the gap is reduced and combustion is difficult, and the hot air that accompanies combustion is reduced due to a decrease in air permeability. Is less likely to penetrate, and heat from the central exhaust heating cylinder is less likely to propagate. Some carbonization materials have low thermal conductivity depending on the processing form and material, and such materials naturally have poor flammability. Therefore, in the conventional carbonization apparatus, when a carbonization material having a small size or inferior thermal conductivity is used, in addition to the time required for carbonization becomes longer, the center side and the peripheral side in the furnace Since the difference in the degree of progress of carbonization is large, there is a problem that the quality of the carbide is easily deteriorated due to uneven burning.

  In view of the above situation, the present invention completes carbonization in a short time with high combustion efficiency even when a small carbonization material or a material with poor thermal conductivity is used, and uniform carbonization throughout the furnace. It is an object of the present invention to provide a carbonization apparatus that can produce high-quality carbides that do not cause uneven burning, and that is structurally simple and that has high thermal efficiency.

  In order to achieve the above object, a carbonization apparatus according to claim 1 of the present invention is provided with an ignition port 11 and an air introduction port 12 capable of adjusting an air supply amount on the bottom side, if indicated with reference numerals in the drawings. A carbonizing furnace F having a furnace body 1, a lid plate 2 for opening and closing a material inlet / outlet port 1 a on the upper side of the furnace body 1, and an in-furnace exhaust pipe line 3 disposed in the furnace body 1, The in-furnace exhaust line 3 includes a central radiator tube 31 standing at the center of the furnace body, a plurality of peripheral radiator tubes 32 standing in the furnace body 1 apart from the central radiator tube, A branch pipe 33 that branches off from the upper end of the central radiating cylinder 31 and communicates with the upper end of each peripheral radiating cylinder 32, and has a plurality of exhaust introduction holes that communicate with the furnace space 10 below the central radiating cylinder 31. 31a, the lower end side of the peripheral radiating cylinder 32 is connected to the out-of-furnace exhaust pipe 4, and the charcoal loaded in the furnace body 1 When the material M is spontaneously combusted in an oxygen-deficient state by ignition from the ignition port 11 and carbonized, the generated combustion gas G flows into the central radiating cylinder 31 from the exhaust introduction hole 31a, and this combustion gas is centrally radiated. The carbonization material M in the furnace body 1 is heated by heat radiation in the process of rising in the cylinder 31 and descending in the peripheral radiation cylinder 32.

  According to a second aspect of the present invention, in the carbonization apparatus of the first aspect, the air introduction ports 12 are provided at a plurality of locations along the peripheral portion on the bottom side of the furnace body 1.

  According to a third aspect of the present invention, in the carbonization apparatus according to the first or second aspect, the peripheral heat radiating cylinder 32 is formed in a shape of a wide hollow strip in the circumferential direction of the furnace body 1.

  According to a fourth aspect of the present invention, in the carbonization apparatus according to any one of the first to third aspects, the three or more peripheral heat radiating cylinders 32 are equally arranged from the center of the furnace body 1 along a circumferential direction of about a half radius. The structure is

  Next, the effects of the present invention will be specifically described with reference to the drawings. First, in the carbonization apparatus according to claim 1, when the carbonizing material M loaded in the furnace body 1 is spontaneously combusted in an oxygen-deficient state by ignition from the ignition port 11, the combustion gas generated by the spontaneous combustion is generated. G flows from the exhaust introduction hole 31a into the central radiating cylinder 31 of the in-furnace exhaust pipe 3, and the combustion gas G rises in the central radiating cylinder 31 and descends in the peripheral radiating cylinder 32 to exhaust the exhaust pipe outside the furnace. 4, the combustion gas G is hot, so that the heat causes the tube wall of the furnace exhaust pipe 3 to be heated and red hot, and hot air is radiated from the red hot tube wall into the furnace space 10. The Thus, the central radiator tube 31 of the in-furnace exhaust pipe 3 is located in the center of the furnace space 10, while a plurality of peripheral radiator tubes 32 branched therefrom are arranged away from the central radiator tube 31. Thus, the carbonization material M on the center side in the furnace is heated by heat radiation from the exhaust raising cylinder 31, and the carbonization material M on the peripheral side in the furnace is heated by heat radiation from the plurality of peripheral heat radiation cylinders 32. The heat radiation from the in-furnace exhaust pipe 3 is heated and spreads throughout the carbonizing material M loaded in the furnace body 1.

  Therefore, according to this carbonization apparatus, even if a carbonization material M having a small size or inferior thermal conductivity is used, the entire inside of the furnace body 1 is heated by the heat radiation from the furnace exhaust pipe 3. Therefore, high combustion efficiency can be obtained by compensating for low air volume during loading, low permeability of hot air, and poor thermal conductivity. In addition, since the carbonization proceeds uniformly throughout the furnace, it is possible to produce a high-quality carbide without uneven burning. Further, since this carbonization apparatus has a large heat radiation area in the entire furnace exhaust pipe 3, the amount of heat taken out of the furnace by the combustion gas G flowing into the furnace exhaust pipe 3 is reduced, and thus high thermal efficiency is obtained. In addition, it is advantageous in that it can be manufactured inexpensively because of its structural simplicity.

  According to the invention of claim 2, since the air introduction ports 12 are provided at a plurality of locations along the peripheral portion on the bottom side of the furnace body 1, the air taken into the furnace is centrally located from the peripheral side of the furnace body 1. Since the carbonization progresses in a uniform combustion state throughout the entire surface, uneven burning is reliably prevented and a higher quality carbide is obtained.

  According to the invention of claim 3, since the peripheral heat radiating cylinder 32 forms a wide hollow strip in the circumferential direction of the furnace body 1, the heat radiating area of the peripheral heat radiating cylinder 32 is widened, and the peripheral area in the furnace main body 1 is increased accordingly. The amount of heat radiation to the carbonizing material M which is large in quantity on the side increases, and the heating action on the peripheral side is equalized, so that the entire carbonizing material M in the furnace body 1 is efficiently radiated with heat. As a result of the frequent carbonization, a higher quality carbide can be obtained in a shorter carbonization time.

  According to the invention of claim 4, since the three or more peripheral heat radiating cylinders 32 are equally arranged along the circumferential direction of about ½ radius from the center of the furnace body 1, A large amount of the carbonizing material M is efficiently and evenly heated by the heat radiation from the three or more peripheral heat radiating cylinders 32, and the heating action of the entire carbonizing material M in the furnace body 1 is also equalized. Carbonization proceeds efficiently, and a higher quality carbide can be obtained in a shorter carbonization time.

  Hereinafter, an embodiment of a carbonization apparatus according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a longitudinal side view of the entire carbonization furnace, and FIG. 2 is a plan view in a state where a cover plate is opened.

  As shown in FIGS. 1 and 2, the carbonization furnace F includes a metal furnace main body 1 that is formed in a bottomed vertical cylindrical shape and has an upper end opening as a material inlet / outlet 1 a, and a material inlet / outlet 1 a of the furnace main body 1. A metal lid plate 2 that opens and closes, an in-furnace exhaust line 3 disposed in the furnace body 1, and an out-of-furnace exhaust line 4 disposed in a piping chamber 5 provided on the lower surface side of the furnace body 1. And have.

  In the furnace body 1, a heat insulating material 13 made of rock wool is stretched on the inner peripheral surface and the inner bottom surface via a metal presser net 14, and an ignition port 11 is provided at one location on the bottom side. Similarly, air inlets 12 are provided at three locations with a phase difference of a central angle of 120 degrees in the peripheral portion on the bottom side, with air supply adjusting valves 15 interposed on the outside of the furnace. Further, the lid plate 2 is secured to a bracket 16 fixed to the upper outer peripheral surface of the furnace main body 1 via a U-shaped support arm 21 that is fixed to the upper surface side thereof and projects laterally. It is pivotally attached to the pivot 17 so as to be rotatable up and down.

  The furnace exhaust pipe 3 is entirely made of metal such as steel, and has a cylindrical central radiator 31 standing at the center of the furnace body 1 and the furnace body 1 so as to surround the central radiator 31. Three peripheral heat radiating cylinders 32 that are arranged upright along the circumferential direction of approximately ½ inner radius, and a horizontal connection from the upper end of the central heat radiating cylinder 31 to the upper end of each peripheral heat radiating cylinder 32 And three branch pipes 33. The central radiating cylinder 31 and the peripheral radiating cylinder 32 are set to a height at which the upper ends reach the vicinity of the ceiling portion of the furnace main body 1, and a large number of exhaust introduction holes 31 a are formed around the lower portion of the central radiating cylinder 31 to penetrate inside and outside the cylinder. Is drilled. Further, each peripheral heat radiating cylinder 32 is formed in a hollow strip shape that is wide and curved along the circumferential direction of a substantially ½ inner radius of the furnace body 1, and its lower end portion is the furnace body. 1 is connected to the out-of-furnace exhaust pipe 6 through a connecting pipe 6 penetrating through the bottom of 1.

  The out-of-furnace exhaust pipe 4 is composed of an annular joining pipe 4a connected to each peripheral heat radiating cylinder 32 and a discharge pipe 4b extending from the joining pipe 6a to the outside of the piping chamber 5, and this discharge pipe 4b. Is connected to an external pipe (not shown) through which an exhaust fan in a post-processing step is interposed.

  In order to perform carbonization by the carbonization apparatus provided with the carbonization furnace F having the above-described configuration, the required carbonization material M is charged into the furnace body 1 and the material inlet / outlet port 1a is closed by the cover plate 2, and the external piping is By driving an exhaust fan (not shown) and suctioning and exhausting through the out-furnace exhaust line 4 and the in-furnace exhaust line 3, the inside of the furnace main body 1 is maintained at a reduced pressure state, and the three air inlets 12 are used. Outside air is introduced at a flow rate set by the air supply adjustment valve 15, an ignition heat source such as a flame of a gas burner (not shown) is introduced from the ignition port 11, and a flame is blown to ignite. Then, after confirming that the lowermost carbonizing material M in the furnace body 1 starts to spontaneously burn, the ignition port 11 is closed.

  Along with the start of the spontaneous combustion, the generated high-temperature combustion gas rises through the gaps between the carbonizing materials M and propagates hot air from the bottom to the top, and a part of the combustion gas G is part of the exhaust inlet 31a. The air is sucked into the central radiator tube 31 of the in-furnace exhaust pipe 3. Then, the sucked combustion gas G rises up to the top in the central radiating cylinder 31 and is divided into three branch pipes 33, flows into the peripheral radiating cylinder 32 and descends, and passes through the connecting pipe 6. The refrigerant enters the merging pipe 4a of the out-of-furnace exhaust pipe 4 and joins, and is discharged from the discharge pipe 4b to the external pipe. As the high-temperature combustion gas G is continuously exhausted through the in-furnace exhaust pipe 3 in this way, first, the lower part of the central radiating cylinder 31 is heated with the hot air of the combustion gas G passing through the interior and the surrounding carbonization. The material M is heated from both the inside and outside by hot air due to spontaneous combustion, and becomes red hot. As the spontaneous combustion in the furnace space 10 further expands, the red heat portion of the central radiating cylinder 31 gradually expands upward due to the increasing amount of hot gas and heat stored in the combustion gas, and the peripheral radiating cylinder 32 also heats from both the inside and outside. As a result, red heat starts from the bottom, and finally the entire furnace exhaust pipe 3 becomes red hot.

  As a result, the carbonizing material M deposited in the furnace space 10 is radiated to the surroundings from the hot air rising from below and from the red-heated central heat radiating tube 31 and the peripheral heat radiating tube 32 of the furnace exhaust pipe 3. Pyrolysis progresses in such a way that it gradually moves from the lower side to the upper side evenly from the central side to the peripheral side of the furnace space 10 and further spontaneously burns when reaching the self-combustion temperature. . As the spontaneous combustion / pyrolysis region expands upward, the furnace exhaust pipe 3 is heated to a higher temperature due to the increase of the inflowing combustion gas G, and the heat radiation to the surroundings is increased. The progress of the thermal decomposition reaction of the material M and the expansion of the spontaneous combustion region are accelerated, and the entire furnace space 10 eventually becomes a uniform high temperature state, and all of the loaded carbonizing material M is pyrolyzed and carbonized.

  In this carbonization treatment, along with the discharge of the combustion gas G from the in-furnace exhaust pipe 3, outside air is sucked into the furnace body 1 from the three air inlets 12 around the bottom portion. The air regulating valve 15 restricts the furnace space 10 to maintain an oxygen-deficient state. Thereby, the carbonization material M continues thermal decomposition in a state in which the carbon component hardly burns due to incomplete combustion, and finally carbonizes completely to the inside.

  Further, the temperature in the furnace of the carbonization furnace F changes depending on the increase or decrease in the amount of air supplied from the air inlet 12, so that it can be adjusted by opening and closing the air supply adjustment valve 15 and changing the opening. Thus, the opening / closing and opening adjustment of the air supply adjustment valve 15 is performed under the processing temperature conditions according to the type and size of the carbonizing material M to be used based on the test data obtained in advance, the moisture content, the loading amount, and the like. Obtained and input to the control device (not shown) as control data associated with the measured temperature of the exhaust gas discharged to the external pipe through the out-of-furnace exhaust pipe 4 and the in-furnace temperature, and by a command signal from the control device What is necessary is just to set so that it may carry out automatically. The in-furnace temperature may be normally set to continue at about 350 ° C. to 500 ° C., but in order to activate spontaneous combustion particularly in the initial stage, for example, temporarily 1000 ° C. within one hour from the start of the treatment. You may set conditions so that it may come near.

  When the thermal decomposition of the carbonization material M is finished, the temperature of the gas discharged to the outside of the furnace is rapidly lowered. Therefore, the completion of the carbonization is found by detecting this with a temperature sensor or the like. After the completion of the carbonization, the temperature of the generated carbide is waited for a certain degree of decrease, and the entire carbonization furnace F is tilted forward until it is slightly lower than the horizontal, so that the generated carbide flows out and is appropriate if necessary. Just scrape with a simple tool.

  In this carbonization apparatus, when the high-temperature combustion gas G generated by the spontaneous combustion of the carbonizing material M is discharged through the in-furnace exhaust pipe 3, the pipe wall becomes red hot and radiates hot air to the surroundings. However, since the central radiating cylinder 31 is located in the center of the furnace space 10 and the three peripheral radiating cylinders 32 branched from the central radiating cylinder 31 are arranged so as to surround the central radiating cylinder 31, The carbonization material M on the center side in the furnace is heated by the heat radiation of the furnace, and the carbonization material M on the peripheral side in the furnace is heated by the heat radiation from the plurality of peripheral heat radiating cylinders 32. The heat radiation from the pipe 3 spreads over the entire carbonizing material M loaded in the furnace body 1.

  Therefore, even if a material having a small size or inferior thermal conductivity is used as the carbonizing material M, the entire inside of the furnace main body 1 is heated evenly by the heat radiation from the exhaust pipe 3 in the furnace, High combustion efficiency can be achieved by compensating for the small amount of air during loading, low permeability of hot air, and poor thermal conductivity, and carbonization can be completed in a short time to achieve high carbonization efficiency. Since carbonization proceeds evenly throughout the furnace, uneven burning is prevented and high-quality and uniform carbide can be produced. Moreover, in this carbonization apparatus, since the heat radiation area of the whole in-furnace exhaust pipe 3 is wide, the amount of heat taken out of the furnace by the combustion gas G passing therethrough is reduced, so that high thermal efficiency is obtained.

  On the other hand, in this embodiment, the air inlets 12 are provided at a plurality of locations along the periphery on the bottom side of the furnace body 1, and the air taken into the furnace is directed from the periphery of the furnace body 1 toward the center. Therefore, the carbonization proceeds in a uniform combustion state as seen in the cross section of the furnace body 1, and the produced carbide becomes more high-quality and homogeneous. On the other hand, in the configuration in which air is taken in from the entire bottom surface of the furnace body 1, the air that has entered the furnace does not gather in the center and spread to the peripheral side, and is uneven due to the difference in the degree of combustion between the central side and the peripheral side. It tends to cause burning.

  In the present invention, there may be a plurality of peripheral radiating cylinders 32 in the furnace exhaust pipe 3, but in order to equalize the heat radiation to the carbonization material M on the peripheral side, three or more peripheral radiating cylinders 32 are circumferentially arranged. It is recommended to arrange them evenly. Further, the shape of each peripheral heat radiating cylinder 32 is also more preferable than a simple cylindrical shape in order to ensure a sufficient heat radiation amount for the carbonizing material M on the peripheral side which is quantitatively larger than the central side. It is preferable to form a wide hollow strip in the circumferential direction from the point of being able to perform uniform heat radiation with a large heat radiation area, and this hollow strip also has a curved shape along the circumferential direction as in the embodiment. Is the best. In addition, the arrangement position of the plurality of peripheral heat radiating cylinders 32 is preferably a position along the circumferential direction of approximately ½ radius from the center of the furnace body 1 in terms of thermal efficiency. Further, when three or more of the peripheral heat radiating cylinders 32 having the curved hollow belt plate shape are equally arranged in the circumferential direction, the total extension along the circumferential direction occupies more than half of the total circumferential length, particularly 60 to 75%. It is better to set as follows.

  The carbonization apparatus of the present invention simply adopts the above-described form as the in-furnace exhaust pipe 3 of the carbonization furnace F, and does not require any special mechanism or special structural part, and the structure is simple overall. Therefore, there is an advantage that it can be manufactured at a low cost. However, since the combustion gas discharged through the in-furnace exhaust pipe 3 is a dry distillation gas containing a volatile component resulting from thermal decomposition of the carbonizing material M, recombustion is performed as a post-process of this carbonization treatment, A facility for collecting the useful components may be attached. For example, volatile components that vaporize when wood and bamboo are heated, as in the past, industrially used as wood carbonization, contain mainly various useful organic components such as acetic acid. Since wood vinegar is obtained from wood and bamboo vinegar is obtained from bamboo, the external piping connected to the exhaust pipe 4 outside the furnace is routed through the extractor to extract and collect the wood vinegar and bamboo vinegar. it can. As for a suitable equipment configuration for recombusting the combustion gas discharged from the carbonization furnace F or extracting and recovering the wood / bamboo vinegar as described above, the prior patent application (see above) Since it is specifically disclosed in Patent Document 2), the description is omitted here.

  The air supply amount adjustment of the air inlet 12 of the carbonization furnace F is not limited to the automatic adjustment using the illustrated air supply adjustment valve 15, and manual adjustment using a manual valve, a damper, or the like may be performed. In addition, in the carbonization apparatus of the present invention, various configurations and accessory equipment such as an installation structure of the carbonization furnace F, a pipe structure of the out-furnace discharge pipe 4, and a mounting structure of the cover plate 2 can be set.

It is a vertical side view of the whole carbonization apparatus concerning one embodiment of the present invention. It is a top view in the state where the lid plate of the carbonization device was opened.

Explanation of symbols

F Carbonization furnace M Carbonization material 1 Furnace main body 1a Material inlet / outlet 10 Furnace space 2 Lid plate 3 Furnace exhaust pipe 31 Central radiator tube 31a Exhaust introduction hole 32 Peripheral radiator cylinder 33 Branch pipe 4 Outer furnace exhaust pipe 11 Ignition port 12 Air inlet 15 Air supply adjustment valve

Claims (4)

A furnace body having an ignition port and an air inlet capable of adjusting the amount of air supply on the bottom side, a lid plate for opening and closing a material inlet / outlet on the upper side of the furnace body, and an exhaust pipe in the furnace disposed in the furnace body A carbonization furnace comprising a road,
The exhaust pipe in the furnace includes a central radiant cylinder standing at the center of the furnace main body, a plurality of peripheral radiant cylinders standing in the furnace body apart from the central radiant cylinder, and a central radiant cylinder A branch pipe that branches from the upper end of each of the peripheral pipes and communicates with the upper end of each peripheral radiator tube.
With a plurality of exhaust introduction holes communicating with the space in the furnace at the lower part of the central radiator tube, the lower end side of the peripheral radiator tube is connected to the exhaust pipe outside the furnace,
When the carbonizing material loaded in the furnace body is spontaneously burned and carbonized in an oxygen-deficient state by ignition from the ignition port, the generated combustion gas flows into the central radiator tube from the exhaust introduction hole. A carbonization apparatus configured to heat the carbonizing material in the furnace body by heat radiation in the process in which the combustion gas rises in the central heat radiation cylinder and descends in the peripheral heat radiation cylinder.   The carbonization apparatus according to claim 1, wherein the air introduction ports are provided at a plurality of locations along a peripheral portion on a bottom side of the furnace body.   The carbonization apparatus according to claim 1 or 2, wherein the peripheral radiator tube forms a hollow strip shape that is wide in a circumferential direction of the furnace body.   The carbonization apparatus according to any one of claims 1 to 3, wherein three or more peripheral radiator tubes are equally arranged along a circumferential direction of an approximately ½ inner radius of the furnace body.

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