JP2001323276A - Carbonization oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbonization oven capable of completing dry distillation within a short time, utilizing heat sources efficiently, reducing operation cost and downsizing the whole system and also detoxifying and deodorizing combustion exhaust gas. SOLUTION: This carbonization oven 1 has a carbonization oven body 10 having a thermosensor 41 and a directly coupled stack 12 provided with a damping device, a combustion furnace 30 set at the inside of the body 10 and having a combustion burner 32, a directly coupled stack 33 provided with a damping device and having a thermosensor 42, a dry distillation box 20 set at the inside of the body 10, a plurality of combustion gas inlet holes 34 provided in the furnace wall of a combustion furnace, and a dry distillation gas- feeding path 21 making the dry distillation box 20 communicate with the combustion furnace and having a thermosensor 43, wherein the combustion gas is obtained by burning the dry distillation gas, dry-distilling and carbonizing the combustion gas while feeding back the gas to the carbonization oven body 10 and maintaining the inside of the carbonization oven body 10 at a required high temperature based on temperature data measured by each thermosensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbonization furnace having a built-in combustion furnace, and more particularly to a carbonization furnace capable of controlling a carbonization speed and a high-heat carbonized material such as waste plastic and a medium-grade carbonized material such as wood. Alternatively, it relates to a carbonization furnace that can automatically and automatically operate these contaminants automatically and safely, reduce combustion energy, increase equipment size, reduce running costs, and detoxify environmental pollutants and harmful substances. is there.

[0002]

2. Description of the Related Art As a conventional carbonization furnace of the dry distillation type, a plurality of combustion burners are provided in a carbonization furnace main body, fuel and air are supplied to each combustion burner, and fuel and air are supplied to each burner. In general, a valve provided with a valve capable of shutting off the supply or adjusting the supply amount has been used. On the other hand, there is also known a carbonization furnace in which a combustion furnace is provided outside a carbonization furnace main body, and a combustion gas or a carbonization gas generated from the carbonization furnace main body is guided to the combustion furnace for combustion.

[0003] In the operation of such a conventional carbonization furnace, the heat of the combustion burner is controlled by shutting off the amount of fuel and air or adjusting the supply amount, or a plurality of burners provided in the main body of the carbonization furnace. By extinguishing or reigniting some of them, the temperature atmosphere in the furnace body was controlled.

[0004]

However, in these control methods, the amount of the carbonization gas supplied to the combustion furnace varies extremely depending on the type and amount of the carbonized material, so that the control method is important. . For example, if the material to be carbonized is a high-grade heated carbonized material such as waste plastic, the temperature of the carbonization furnace becomes high,
Since a large amount of carbonization gas is supplied to the combustion furnace and burned, the temperature inside the combustion furnace rises rapidly, and the temperature inside the carbonization furnace itself also rises sharply. Then, since the carbonization reaction is accelerated in a chain, the carbonization gas becomes excessive and the combustion capacity of the combustion furnace becomes excessive, causing problems such as black smoke and toxic gas generation, and pollution problems. There was also.

On the other hand, if the material to be carbonized is an intermediate heat-generating carbonized material such as plant material such as wood or bamboo, even if these materials are pulverized into powder or granules, the heat conductivity of the fibrous substance is small and it is necessary for carbonization. As it is difficult to conduct heat and dry distillation, it is difficult to generate carbonization gas, and the supply of carbonization gas to the combustion furnace is in an insufficiency state, so that the temperature drops and the temperature atmosphere in the carbonization furnace body drops. Become. When the temperature decreases, the carbonization reaction does not proceed further, and the carbonization gas generation further decreases. That is, the dry distillation carbonization reaction is in a short supply state of the dry distillation gas in a chain, and there are problems that the carbonization time becomes longer and the combustion cost increases, or that the dry distillation carbonization becomes impossible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to control the carbonization rate and to provide highly heat-generating carbonized materials such as waste plastics and wood. A dry distillation system that can automatically and automatically operate intermediate-grade carbonized materials or their mixed substances unattended, quickly and safely, reducing combustion energy, increasing equipment size, reducing running costs, and detoxifying environmental pollutants and harmful substances. The carbonization furnace will be provided.

[0007]

The gist of the means adopted by the present invention to achieve the above object is as set forth in the appended claims.

[0008] In the carbonizing furnace according to the invention described in each of the claims adopting such a configuration, the carbonized material is a high-grade heat-generating carbonized material such as, for example, a waste plastic, and the carbonizing furnace is heated to a high temperature during operation. As a result, a large amount of carbonized gas is supplied to the combustion furnace, and the amount of carbonized gas generated and supplied can be limited before the temperature atmosphere in the carbonization furnace body rises due to a vicious cycle in which these burn. . That is, the temperature atmosphere in the carbonization furnace main body can be maintained at the optimum carbonization temperature, and chain acceleration of the dry distillation carbonization reaction can be prevented.

[0009] Further, the carbonized material is an intermediate heat-generating carbonized material such as a plant material such as wood or bamboo, which causes a shortage of dry distillation gas and an insufficient supply of dry distillation gas to the combustion furnace. Before the temperature atmosphere in the carbonization furnace body drops, the combustion burner can be reignited to burn fuel and inject a combustion flame into the combustion furnace, thereby reducing the chain reduction of the carbonization reaction. Can be prevented. That is, the temperature atmosphere in the carbonization furnace main body can always be maintained at the optimal temperature for carbonization, and dry distillation carbonization is not possible, and the carbonization time is not increased and the combustion cost is not increased.

That is, in the carbonization furnace according to the invention described in each claim, even if the generation of the amount of the carbonization gas supplied to the combustion furnace changes suddenly depending on the type and amount of the material to be carbonized, The carbonization speed of the carbonized material can be freely controlled as needed, and the temperature atmosphere in the carbonization furnace main body can always be maintained at the optimum carbonization temperature.

[0011] In particular, according to the carbonization furnace according to the second aspect of the present invention, in particular, since the air is vigorously injected from the injection port of the air supply pipe, the air can be suctioned under reduced pressure, and gas mixing can be performed effectively. The carbonization gas can be burned. That is, by feeding back the combustion gas obtained by the combustion into the carbonization furnace, the inside of the carbonization furnace can be set to a high-temperature atmosphere, and the fuel cost can be significantly reduced.

According to the carbonization furnace according to the third aspect of the present invention, in particular, a honeycomb structure in which heat-resistant cylinders are alternately combined to form a block, and the blocks are arranged so as to be separated by at least the length of the block. Since it passes, in the process of passing through the honeycomb structure, environmental pollutants such as dioxins and harmful substances can be more completely burned and thermally decomposed, thereby detoxifying or deodorizing environmental pollutants and harmful substances. Can be smokeless.

[0013] In the carbonization furnace according to the above-mentioned claims, a configuration is adopted in which a fixed-type gas mixing blade member is provided on the combustion furnace side of the air pipe injection port in the dry distillation gas supply path. In this case, the carbonized gas and air can be effectively mixed, and the above-mentioned action obtained by the honeycomb structure is added, so that environmental pollutants and harmful substances can be more efficiently detoxified or deodorized. This is preferable because smoke can be eliminated.

That is, according to the carbonization furnace according to the invention described in each claim, the automatic furnace can be operated unmanned quickly and safely without being affected by the type and amount of the material to be carbonized, reducing the combustion energy and increasing the size of the equipment. , Lower running costs, and
It can purify environmental pollutants and harmful substances.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below with reference to examples. However, these are merely exemplifications as typical examples, and the following examples will be described unless they depart from the gist. The invention is not limited by the examples,
It can be implemented with various design changes.

FIG. 1 is a longitudinal sectional view schematically showing a carbonizing furnace 1 according to a first embodiment, and FIG. 2 is a transverse sectional view taken along line AA of FIG.

In the drawing, a carbonization furnace 1 is provided with a carbonization furnace main body 10.
And a carbonization box 20 having an open side surface facing the opening and closing door of the carbonization furnace main body 10, and a carbonization box 2 through a carbonization gas supply path 21 communicating with the carbonization box 20.
And a combustion furnace 30 for burning the carbonization gas supplied from the combustion furnace 30.
A plurality of combustion gas intake holes 34 communicating with the inside are formed. Then, the combustion gas obtained by burning the carbonization gas can be fed back into the carbonization furnace main body 10.

The carbonization furnace main body 10 has a heat-resistant steel furnace body 11 in which a heat-resistant heat insulating material is laid on the entire inner surface, an opening / closing door which shuts off the outside air and keeps the inside thereof sealed, and discharges combustion exhaust gas. Dambar device A12a for controlling
The furnace is provided with a directly connected chimney A12 equipped in a flue and a carbonizing furnace cooling blower 14 for supplying external air toward the inside of the furnace body 11 and cooling the inside of the furnace body 11.

The dry distillation box 20 is made of a heat-resistant steel material, and is placed on the inner surface of the bottom wall of the furnace body 11 in a semi-fixed or fixed state. The side surface facing the opening / closing door provided in the furnace body 11 is opened, and the material to be carbonized is accommodated in, for example, a heat-resistant steel basket (not shown) or the like, and is put in and out together with the basket.

The combustion furnace 30 is directly connected with a furnace body 31, a combustion burner 32 for supplying a high-temperature injection flame into the furnace body 31, and a dambar device B33a capable of freely adjusting a discharge amount of combustion exhaust gas in the flue. The combustion furnace 30 includes a chimney 33 and a plurality of combustion gas intake holes 34 formed on both sides of the furnace wall 31a and communicating with the inside of the carbonization furnace main body 10.
It has a structure that also serves as the bottom wall 13.

The bottom wall 13 of the furnace body 11 has a thickness of 65 m.
A refractory heat insulating material 13b such as ceramic wool is appropriately laid on the m refractory brick 13a. When the carbonization target is a high heat generation target such as a waste plastic, the thickness of the refractory heat insulating material 13b is, for example, about 110 to 130 mm, and the carbonization target is a medium heat generation target such as a plant material such as wood. When the thickness is set to 100 mm or less, it is possible to remove the influence factors other than the combustion gas intake on the temperature rise and fall in the furnace body 11 and to determine the furnace based on the temperature information detected by each sensor device. This is preferable because the temperature inside the body 11 can be reliably controlled.

The combustion burner 32 includes the burner 32
A burner blower for supplying air to the burner is set, and the burner blower is driven and burned during the initial furnace operation.

The carbonization gas generated in the carbonization box 20 is introduced into the combustion furnace 30 through the carbonization gas supply path 21. After the air is mixed with the carbonized gas, this mixed gas is introduced into the combustion furnace 30, and even if the combustion burner 32 is extinguished, the inside of the combustion furnace 30 is in a high temperature atmosphere.
Since the carbonization gas self-combustes, combustion gas usable as a heat source can be generated.

On the dry distillation box side of the dry distillation gas supply path 21,
A temperature sensor C43 for detecting the temperature of the carbonization box is provided, and an air supply pipe 35 having an injection port 35a having a diameter of 2 mm or more is provided on the combustion furnace side. On the other hand, the other end of the air supply pipe 35 has a damper device C3 having a blower 36a for dry distillation gas combustion capable of continuously converting the amount of air blow and a wind pressure opening / closing damper member 36b capable of preventing backflow.
6 (FIG. 3), so that the supply amount of air for gas mixing with the carbonization gas can be continuously controlled. When air is vigorously injected from the injection port 35a,
Since this position is locally in a reduced pressure state, the dry distillation gas can be sucked under reduced pressure, so that the dry distillation gas and the air can be mixed very efficiently and the backflow can be prevented.

The tip of the air supply pipe 35 is located within the dry distillation gas supply path 21 and 50 to 50 mm from the intake port of the combustion furnace 30.
It is arranged 500 mm before. If the diameter of the injection port 35a is 2 mm or less, the combustion gas cannot be injected because the soot and the droplets mixed in the carbonization gas are clogged.

The tip of the air supply pipe 35 may be branched into a plurality of pieces, or the tip may be closed so that the inner angle (θ) is 90 ° to 180 °, and the tip of the air supply pipe 35 has a hole diameter of 2 °. A plurality of injection ports 35a each having a diameter of 6 mm may be formed.
Even if the inner angle (θ) of the tip is 90 ° or less,
° or more, there is a tendency that the reduced pressure absorption capacity obtained by combustion gas injection is reduced.

Also, if the tip of the air supply pipe 35 is too far from the combustion furnace 30 or too far, the gas mixing capacity tends to decrease. Furthermore, if the ratio of the cross-sectional area of the dry distillation gas supply passage 11 to the cross-sectional area of the injection port 35a of the air supply pipe 35 is 5 or less or 20 or more, the gas mixing capacity tends to decrease. The reason is that, in order to mix the gas efficiently, it is necessary to adjust the load pressure (resistance) of the carbonized gas to be injected, and the sectional area of the carbonized gas supply passage 21 and the cutoff of the injection port 35a are required. If the ratio with the area is 5 or less, the load pressure (resistance) is too large, and if the ratio is 20 or more, the load pressure (resistance) is too small.

According to the combustion furnace 30 configured as described above,
By injecting air from the injection port 35a of the air supply pipe 35, gas mixing and suction decompression of the carbonized gas and air can be performed, and fuel cost for decomposing the carbonized gas at 800 ° C. or more can be reduced. . In addition, the combustion furnace 30
A honeycomb structure 54 as shown in FIG. The honeycomb structure 50 is made of a heat-resistant stainless steel, a heat-resistant cylinder 51a made of carborundum, mullite, alumina ceramics, or the like.
(The outer diameter is 25 to 150 mm, the inner diameter is 20 to 100 mm, and the length is 50 to 200 mm). A block 51b constructed by combining two to six rows alternately is separated by a distance (B) which is equal to or longer than the length (A) of the block 51b. One to three pieces can be exemplified.

When the block 51b is formed by alternately combining the heat-resistant tubular bodies 51a and the block 51b is passed through the honeycomb structure 50 which is arranged at a distance longer than the length of the block 51b, dioxin is passed through the honeycomb structure 50 in the process of passing through the honeycomb structure 50. More complete combustion of environmental pollutants and harmful substances such as
It is very suitable because it can be thermally decomposed, thereby detoxifying or deodorizing environmental pollutants and harmful substances, and can be smokeless.

When a gas mixing blade member (not shown) is provided between the injection port 35a of the air supply pipe 35 and the outlet of the carbonized gas supply passage 21, a mixed gas of the carbonized gas and the combustion air is swirled. Since the gas mixture can be supplied into the combustion furnace 30 and the mixed gas can be mixed more homogeneously, in addition to the above-mentioned action obtained in the honeycomb structure 50, the environmental pollutants and harmful substances can be more efficiently obtained. Can be detoxified, deodorized and smokeless.

Since the combustion gas at about 1000 ° C. that has passed through the honeycomb structure 50 is fed back into the carbonization furnace main body 10, the carbonization furnace main body 1
It is used as a major heat source, and can greatly reduce combustion energy. That is, in addition to reducing running costs, high-speed carbonization becomes possible, and the size of the entire equipment can be reduced.

In the carbonization furnace 1, the temperature atmosphere inside the carbonization furnace main body 10, especially the combustion furnace 3, is located above the combustion gas intake hole 34 and on the outer surface of the bottom wall of the carbonization box 20.
A sensor device A41 for constantly monitoring the temperature of the combustion gas supplied from 0 is installed, and a sensor device for constantly monitoring the temperature atmosphere in the combustion furnace 30, particularly the temperature in the combustion furnace, in the combustion furnace 30. B42 is attached.

Temperature sensor A41, sensor B42
All of the temperature information detected by the sensor C43 is transmitted to an automatic control system (not shown). And
From the automatic control system, signals for controlling the temperature of the carbonization furnace main body 10 and the temperature of the combustion furnace 30 (that is, controlling the carbonization speed) are transmitted. In response to the signals, the dambar devices A12a, B33a, Dunbar device C
36, blower for burner, blower for burning carbonized gas
a and the blower 37 for cooling the carbonization furnace main body.

In addition, as shown in FIG. 5, the tip of the directly connected chimney of the carbonization furnace main body is connected to the intermediate portion of the directly connected chimney of the combustion furnace, so that the dambar devices A and B are configured to be driven in conjunction with each other. As shown in FIG. 6, a direct connection chimney of the combustion furnace is disposed at an intermediate position from the combustion burner to the carbonization furnace, and the dambar devices A and B are individually driven and controlled or are configured to be driven in conjunction with each other. The design can be changed.

Next, a method of operating the carbonization furnace 10 will be briefly described.

First, the material to be carbonized accommodated in a heat-resistant steel basket (not shown) is put into the carbonization box together with the basket, and the open / close door is closed to shut off both the carbonization furnace main body 10 and the carbonization box 20 from outside air. At this time, the dambar device A12 provided in the directly connected chimney 12 of the carbonization furnace body 10
a is in an open state, the dambar device B33a provided in the direct connection chimney 33 of the combustion furnace 30 is in a closed state, and the blower for the burner, the blower 36a for burning the carbonized gas, and the blower 37 for cooling the furnace body are all off. . Next, the combustion burner 32 is ignited to inject a combustion flame, and the
The temperature in 0 is increased from 500 to 600 ° C. to an initial predetermined temperature (for example, 550 ° C.) and maintained at this temperature. In this process, the drying of the carbonized material is completed, and then the carbonization reaction starts. When the carbonization reaction starts, the temperature of the carbonized gas becomes 5
Since the temperature is higher than 50 ° C., it can be detected by the sensor C.

Next, the set temperature in the combustion furnace 30 is set to 900
The setting is changed again to at least 1 ° C. (for example, 1150 ° C.) (safety measures at abnormally high temperatures are taken), and the temperature of the carbonization furnace main body 10, that is, the carbonization box is raised. When air is mixed with the carbonized gas and introduced into the combustion furnace 30, the mixed gas self-combustes due to the high temperature inside the combustion furnace 30, so that combustion gas is generated. That is, since the process of using the obtained combustion gas as a heat source is repeated, the material to be carbonized can be completely carbonized. When the carbonization reaction of the carbonized material is completed and left to cool, a carbide (charcoal) of the carbonized material is obtained.

The carbide (char) obtained in this way is
It can be used as a soil conditioner, deodorant, snow melting agent, water purification material, humidity control material, etc., and can be provided at low cost.

[0039]

As described above, according to the carbonization furnace according to the invention described in each claim, the carbonization furnace is not affected by the type and amount of the material to be carbonized,
Extremely effective operation, such as being able to operate the furnace automatically and unattended quickly and safely, reducing combustion energy, increasing equipment size, reducing running costs, and purifying environmental pollutants and harmful substances. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a carbonization furnace of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view schematically showing a dambar device C provided outside the air supply pipe, and has a blower for dry distillation gas combustion capable of continuously converting the amount of blown air and a wind pressure opening / closing dambar member capable of preventing backflow. ing.

FIG. 4 is a cross-sectional view of a main part schematically showing a honeycomb structure provided inside a combustion furnace.

FIG. 5 is a longitudinal sectional view schematically showing another carbonization furnace according to the present invention, in which a tip of a direct connection chimney of a carbonization furnace main body is connected to an intermediate portion of a direct connection chimney of a combustion furnace; Dunbar device A
And the dambar device B are driven in conjunction with each other.

FIG. 6 is a longitudinal sectional view schematically showing still another carbonization furnace according to the present invention, wherein a direct connection chimney of the combustion furnace is provided at an intermediate position from the combustion burner to the carbonization furnace. As a result, the dam bar device A and the dam bar device B are driven in conjunction with each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Carbonization furnace 10 ... Carbonization furnace main body 11 ... Furnace body 12 ... Directly connected chimney A 12a ... Dambar device A13 ... Bottom wall 13a ... Refractory brick 13b ... Refractory heat insulating material 14 ... Carbonization furnace cooling blower 20 ... Carbonization box 21 ... Carbonization Gas supply path 30 Combustion furnace 31 Furnace body 31a Furnace wall 32 Combustion burner 33 Directly connected chimney 33a Damper device B 33c Damper device B 34 Combustion gas intake hole 35 Air supply pipe 35a Injection port 36 ... Dumbar device C 36a ... Blower for burning carbonized gas 36b ... Wind pressure opening / closing dambar member 37 ... Blower for cooling the carbonization furnace main body 41 ... Temperature sensing sensor A 42 ... Temperature sensing sensor B 43 ... Temperature sensing sensor C 50 ... Honeycomb structure 51a ... Heat-resistant cylinder 51b… Block

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/50 ZAB F23G 5/50 ZABM ZABH (72) Inventor Hiroyuki Itatsu 9-chome Hongocho, Minokamo-shi, Gifu No. 18-37 C.Y.C. Co., Ltd. (72) Koji Taguchi Inventor 9-18-37 Hongocho, Minokamo-shi, Gifu C.C.Y.C. Co., Ltd. (72) Inventor Masafumi Kamei Gifu, Japan 9-18-37 Hongo-cho, Minokamo-shi F-term in CW Sea (reference) 3K061 AA18 AB02 AC01 AC13 AC17 BA06 CA01 EA05 FA10 3K062 AA18 AB02 AC01 AC13 AC17 BA02 CA01 CB03 CB10 DA01 DB01 3K078 AA06 BA06 CA02 4D004 AA07 AA12 AB07 AC04 BA02 BA10 CA26 CA48 CB02 CB34 DA02 DA06 4H012 HB02 HB09 JA01 JA11

Claims (5)

[Claims] 1. A carbonization furnace main body having a temperature sensing sensor A for detecting the temperature inside the furnace, a chimney A having a flue A and a directly connected chimney A provided with a damper device A, and a carbonization furnace main body, which is built in the carbonization furnace main body. A combustion furnace having a combustion burner on a furnace wall, a flue B having a directly connected chimney B having a dambar device B, and having a temperature sensing sensor B for detecting an internal temperature, and being placed in the carbonization furnace main body. A carbonization box containing a carbonized material therein, a plurality of combustion gas intake holes provided on both sides of the furnace wall of the combustion furnace and communicating with the carbonization furnace main body, and a communication between the carbonization box and the combustion furnace, A dry distillation gas supply path provided with a temperature sensor C for detecting the temperature of the dry distillation gas supplied to the combustion furnace, and extinguishes the combustion burner to burn the dry distillation gas to burn the combustion gas. Generating this combustion gas into the carbonization furnace. A carbonization furnace for carbonizing the carbonized material while feeding it back into the body, based on temperature information detected by the temperature sensing sensor A, the temperature sensing sensor B, and the temperature sensing sensor C, based on the temperature information. A carbonization furnace characterized by maintaining the inside of the carbonization furnace main body at a desired predetermined high temperature atmosphere by adjusting the opening and closing of each device B. 2. The carbonization furnace, wherein an inside diameter 2 provided inside the dry distillation gas supply passage inside the combustion furnace is provided.
A carbonization furnace equipped with an air supply pipe equipped with a damper device C at the other end, having an injection port of at least 2 mm, wherein the damper device C is a blower for burning a carbonized gas that can continuously convert the amount of air blow and a backflow prevention. Controlling the amount of air to be mixed with the dry distillation gas based on temperature information detected by the temperature sensor A, the temperature sensor B, and the temperature sensor C. The carbonization furnace according to claim 1, characterized in that: 3. A ratio of a cross-sectional area of the dry distillation gas supply passage to a cross-sectional area of the injection port is in a range of 5 to 20, and the air supply pipe injection port is 50 to 50 in front of an inlet of the combustion furnace.
The carbonization furnace according to claim 2, wherein the carbonization furnace is arranged at a position of 500 mm. 4. In the carbonization furnace, when the temperature detected by the sensor B reaches an initial high temperature value set to a desired predetermined temperature, the dambar device A is closed and the dambar device B is opened. And when the temperature detected by the sensor B reaches the initial set low temperature value, the automatic control system operates to open the dambar device A and close the dambar device B. The carbonization furnace according to claim 1, wherein: 5. The carbonization furnace, wherein the carbonization furnace main body is further provided with a blower for cooling the carbonization furnace main body, and the automatic control system is configured such that the temperature information detected by the sensor B indicates the initial set high temperature value. It is programmed to drive the carbonizing furnace body cooling blower when greatly exceeded, to reduce the combustion gas supply to the carbonizing furnace body and to promote hot gas emissions within the carbonizing furnace body. The carbonization furnace according to claim 4, characterized in that: