TW201623390A - Method of pyrolysis of organic substances, method for producing pyrolysate of organic substances, and furnace for pyrolysis of organic substances - Google Patents

Abstract

In the present invention, particulate organic substances are blown diagonally downward into a lower region of a bed 3 through an inlet 2 provided on a lower side face of a pyrolysis furnace 1. This action allows the following effects to be achieved in combination: (i) the bed material in the lower region of the bed will become fluidized such that the bed material throughout the entire bed will function sufficiently, since bed material with large particle sizes can be prevented from settling in the lower regions of the bed; (ii) the particulate organic substances blown into the lower region of the bed will move (float) from the lower region of the bed to an upper region and in the process can cause a pyrolytic gasification reaction, allowing the entire bed to be effectively used for the pyrolytic gasification reaction; and (iii) the particulate organic substances will be loaded into the bed at high speed at a constant solid/gas ratio so that a feedstock loading inlet will not be blocked up for example by molten resins. The above effects allow organic substances such as resins to be efficiently pyrolyzed.

Description

Thermal decomposition method of organic substance, manufacturing method of thermal decomposition product of organic substance, and thermal decomposition furnace of organic substance

The present invention relates to a method and a thermal decomposition furnace for efficiently decomposing organic substances such as resins and producing high calorific gas or oil.

In recent years, the energy problem has evolved into a big problem. As a way to solve this problem, a method of effectively utilizing the latent heat of organic substances can be considered. In particular, resin-based wastes, including waste plastics, have a high calorific value, and thus have the possibility of effectively utilizing as a substitute fuel for fossil fuels. However, since the resin-based waste has poor thermal conductivity, it takes time to raise the temperature, and thus the burning speed is very slow, and it is difficult to use it as a substitute fuel while still being in a solid state. Therefore, it is conceivable to decompose the resin and convert it into a gas or oil before using the fuel as a method.

For example, Patent Document 1 discloses a method of disassembling a car containing a plastic (Car Shredder Dust) and performing thermal decomposition using a kiln. In this method, in order to prevent the molten plastic from adhering and solidifying inside the kiln, the molten slag generated by the combustion melting furnace is put into the kiln together with the disassembled debris of the automobile.

However, the kiln method used in the method of Patent Document 1 has a low heat transfer efficiency, and it is necessary to reduce the solid filling rate in the furnace in order to stably carry the raw material. Further, since the solid contains slag, the self-filling rate of the disassembled chips becomes lower, and if the processing speed is to be sufficiently obtained, there is a problem that the size of the apparatus must be increased.

On the other hand, Patent Document 2 discloses that a fluidized layer reaction is used. In the furnace, the organic substance is vaporized by thermal decomposition, and the carbon contained in the flowing medium is burned by the combustion furnace, and the flowing medium is used as a heat medium and returned to the fluidized bed. According to the method of Patent Document 2, by using a fluidized layer to increase the heat transfer rate to the organic substance, vaporization can be performed at a low temperature efficiency.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2012-237549

Patent Document 2: International Publication No. 2008/107928

However, in the method of Patent Document 2, when a resin such as waste plastic is used as a target of thermal decomposition, thermal decomposition of the resin cannot efficiently utilize the entire fluidized layer, and the raw material of the fluidized layer is introduced by the molten resin. It is easy to be blocked and the like, and it is found that it is difficult to carry out efficient thermal decomposition treatment of the resin.

In order to solve the problems of the above-described conventional techniques, the present invention provides a thermal decomposition method and a thermal decomposition product which can perform efficient thermal decomposition treatment on an organic substance such as a resin using a fluidized bed thermal decomposition furnace. Method and thermal decomposition furnace.

The inventors of the present invention conducted a detailed review of the problems in the thermal decomposition of the resin by the fluidized bed thermal decomposition furnace, and as a result, found that the factors that hinder the efficient thermal decomposition treatment are as follows.

(i) The flow medium used in the fluidized layer may vary somewhat depending on its type, but it has a certain particle size distribution (particle size width), and the flow medium with larger particle size Poor, easy to stay in the lower area of the flow layer. Therefore, the entire fluidic layer will not fully exert the function of the flowing medium.

(ii) Since the specific gravity of the resin is smaller than that of the flowing medium (usually using strontium sand or the like), it floats easily on the upper portion of the fluidized bed after being charged, and thus the upper portion of the fluidized layer is subjected to thermal decomposition gasification reaction, and the lower portion of the fluidized layer is Not effectively utilized in thermal decomposition gasification reactions.

(iii) The raw material inlet of the fluidized bed is liable to be clogged due to the molten resin.

In order to solve the above problems, the inventors of the present invention have reviewed a method capable of performing a resin-based efficient thermal decomposition treatment. As a result, it was found that the resin to be thermally decomposed was granulated by granulation, pulverization, classification, or the like, and the granulated resin was blown in the obliquely downward direction through a blowing inlet provided in the fluidized bed thermal decomposition furnace. The method in the lower region of the flow layer is an effective method. In other words, according to this method, the following effects (1) to (3) can be obtained for the above problems (i) to (iii), and therefore it is judged that the resin can be thermally decomposed efficiently.

(1) By blowing the granular resin into the lower region of the fluidized layer in the obliquely downward direction, the flow state of the flowing medium in the lower portion of the fluidized bed is activated, thereby preventing the retention of the particle diameter in the lower region of the fluidized layer. Larger flow media. Therefore, the entire fluidized bed can fully exert the function of the flowing medium, and the heat transfer rate or the thermal decomposition reaction rate to the resin can be greatly improved.

(2) The granular resin which is blown into the lower portion of the fluidized bed, since it moves (floats) from the lower region of the fluidized layer to the upper region, a thermal decomposition gasification reaction can be generated in the process, and therefore, the entire flow layer Both can be effectively used in the thermal decomposition gasification reaction, and can greatly increase the gasification rate.

(3) Since the resin is loaded into the fluidized bed at a high speed according to a certain solid-gas ratio, it is almost There is no clogging of the raw material inlet due to the molten resin.

The present invention has been completed on the basis of such findings, and the following is intended to be the subject matter.

[1] A method for thermally decomposing an organic substance, which is a method for thermally decomposing a granular organic substance in a fluidized bed thermal decomposition furnace, characterized in that a granular organic substance to be thermally decomposed is passed through a thermal decomposition furnace (1) The air inlet (2) provided on the lower side surface is blown downward in the downward direction of the flow layer (3).

[2] A thermal decomposition method of an organic substance, wherein in the thermal decomposition method of the above [1], the direction in which the particulate organic substance in the lower portion of the fluidized layer (3) is blown is downward with respect to the horizontal direction. 45° tilt angle.

[3] A method for thermally decomposing an organic substance, wherein in the thermal decomposition method of the above [1] or [2], part or all of the transport gas of the particulate organic substance is contained in the fluidized layer (3) and becomes a pellet. a gas of a gasifying agent of an organic substance.

[4] A method for thermally decomposing an organic substance, in the thermal decomposition method according to any one of the above [1] to [3], wherein the inner diameter D of the blowing inlet (2) is provided in the thermal decomposition furnace, and the flow is from the flow The height h from the lower end position of the layer (3) to the lower end position of the blowing inlet (2) and the stationary height L of the flowing medium satisfy the following formula (1): 3D≦h≦L/3...(1)

[5] A thermal decomposition method of any one of the above [1] to [4], wherein the flowing medium contains dust generated by an ironworks.

[6] A method for producing a thermal decomposition product of an organic substance, which is a method for thermally decomposing a particulate organic substance in a fluidized bed thermal decomposition furnace and producing a thermally decomposed product of an organic substance, characterized in that The particulate organic substance to be thermally decomposed is blown in the obliquely downward direction to the lower region of the fluidized bed (3) through the blowing inlet (2) provided on the lower side of the thermal decomposition furnace (1).

[7] A method for producing a thermal decomposition product of an organic substance, which is characterized in that, in the production method of the above [6], the direction in which the particulate organic substance in the lower portion of the fluidized layer (3) is blown is directed to the horizontal direction. The lower 25~45° tilt angle.

[8] A method for producing a thermally decomposed product of an organic substance, wherein the part or all of the transport gas of the particulate organic substance is contained in the fluidized bed (3) in the production method of the above [6] or [7] A gas that will become a gasifying agent for particulate organic matter.

[9] A method for producing a thermal decomposition product of an organic substance, wherein the inner diameter D of the blowing inlet (2) is provided in the thermal decomposition furnace in the production method according to any one of the above [6] to [8] The height h from the lower end position of the fluidized bed (3) to the lower end position of the blowing inlet (2) and the stationary height L of the flowing medium satisfy the following formula (1): 3D≦h≦L/3...(1) )

[10] A method for producing a thermal decomposition product of an organic substance, wherein the flow medium comprises dust generated by an ironworks in the production method according to any one of the above [6] to [9].

[11] A thermal decomposition furnace for organic substances, which is a fluidized bed thermal decomposition furnace for thermally decomposing organic substances, characterized in that a blowing inlet (2) is provided on a lower side of the furnace body, and the blowing inlet ( 2) The granular organic substance is blown in the downward direction in the lower region of the flow layer formed in the furnace.

[12] A thermal decomposition furnace for an organic substance, which is in a thermal decomposition furnace of the above [11], which blows a direction from a blowing inlet (2) to a granular organic substance in a lower portion of the fluidized bed, and has a direction with respect to a horizontal direction The lower 25~45° tilt angle.

[13] A thermal decomposition furnace for an organic substance, which is in the thermal decomposition furnace of the above [11] or [12], wherein the blowing inlet (2) is connected to the blowing pipe (8), and the blowing pipe (8) is connected to the granular material. A gas supply supply pipe (9) for organic substances.

[14] A thermal decomposition furnace for organic substances, which is one of the above [11] to [13] In the thermal decomposition furnace, the inner diameter D of the blowing inlet (2), the height h from the lower end position of the fluidized bed (3) to the lower end position of the blowing inlet (2), and the stationary height L of the flowing medium satisfy the following (1). Type: 3D≦h≦L/3...(1)

According to the present invention, when the organic substance of the fluidized bed type thermal decomposition furnace is used for thermal decomposition, the following effects (1) to (3) can be obtained in a composite manner, whereby an organic substance such as a resin can be efficiently produced. Thermal decomposition treatment.

(1) By blowing the granular organic substance in the obliquely downward direction toward the lower portion of the fluidized bed, the flow state of the flowing medium in the lower portion of the flowing layer is activated, thereby preventing the retention of the particle size in the lower region of the flowing layer. Larger flow media. Therefore, the entire fluidized layer can fully exert the function of the flowing medium, and the heat transfer rate or the thermal decomposition reaction rate of the organic substance can be greatly improved.

(2) The granular organic matter blown into the lower portion of the fluidized bed, due to the movement (floating) from the lower region of the fluidized bed to the upper region, can cause thermal decomposition gasification reaction in the process, so the flow layer is full The area can be effectively used in the thermal decomposition gasification reaction, and the gasification rate is greatly increased.

(3) Since the granular organic substance is charged into the fluidized bed at a high speed according to a certain solid-gas ratio, there is almost no clogging of the raw material inlet due to the molten resin.

1‧‧‧ Thermal decomposition furnace

2‧‧‧Blowing the entrance

3‧‧‧Mobile layer

4‧‧‧ gas supply pipe

5‧‧‧Dispersion board

6‧‧‧Windbox Department

7‧‧‧Draining tube

8‧‧‧Blow in tube

9‧‧‧Supply tube

10a‧‧‧ hopper

10b‧‧‧ hopper

11a‧‧‧Table feeder

11b‧‧‧Table feeder

12‧‧‧ gas cylinder

13‧‧‧ gas cylinder

14‧‧‧ gas supply pipe

15‧‧‧ gas cooler

16‧‧‧Mass flow meter

17‧‧‧ gas phase chromatography analyzer

18‧‧‧ gas trap

Fig. 1 is an explanatory view showing an example of a fluidized bed thermal decomposition furnace used in the present invention and an embodiment of the present invention using the same.

Figure 2 is a partial enlarged view of the lower region of the thermal decomposition furnace of Figure 1.

Fig. 3 is a schematic explanatory view showing a fluidized bed type gasification test apparatus used in the examples.

In the present invention, the organic substance (solid) to be thermally decomposed is not particularly limited, and is preferably a high molecular weight organic substance, and examples thereof include a resin (usually a waste plastic), a raw material, and the like. One or more objects are used.

The resin type may, for example, be a polyolefin such as PE (Poly Ethylene) or PP (Polypropylene), PA (Polyamide) or PET (Poly Ethylene Terephthalate, polyethylene terephthalate). An elastomer such as a diester), an elastomer such as PS (Poly Styrene), a thermosetting resin, a synthetic rubber or a foamed styrene, but is not limited thereto.

Further, the biomass system may be, for example, sewage sludge, paper, wood (for example, construction waste wood, bales, transported waste wood, thinned wood, etc.), but is not limited thereto.

These organic substances are used for the gas transfer and blowing into the fluidized layer. In order to granulate the organic substance, pretreatment such as granulation, pulverization, grading, and the like can be suitably performed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an example of a thermal decomposition furnace used in the present invention and an embodiment of the method of the present invention using the same, and Fig. 2 is a partial enlarged view of a lower portion of the thermal decomposition furnace of Fig. 1, and 1 is a fluidized layer heat. Decomposition furnace, 3 series flow layer.

In the thermal decomposition furnace 1, the flowing gas (gasifying agent) is introduced into the bellows portion 6 on the lower side of the dispersion plate 5 through the gas supply pipe 4, and the flowing gas is blown out from the dispersion plate 5 to be dispersed in the dispersion plate. The flow layer 3 is formed by a flowing medium above the fifth. The organic substance introduced into the thermal decomposition furnace 1 is thermally decomposed in the fluidized bed 3 to become a gas product. contain After the gas of the gas product is discharged through the discharge pipe 7, the flow medium or the organic matter ash scattered in the gas is collected by a dust collector (not shown).

In the lower side surface of the thermal decomposition furnace 1, a blowing inlet 2 for blowing a particulate organic substance conveyed by a gas into the furnace is provided; in the present invention, the particulate organic substance conveyed by the gas flows through the blowing inlet 2 The lower portion of the layer 3 is blown in the obliquely downward direction.

Hereinafter, the case of the particulate organic substance-based resin to be thermally decomposed will be described as an example of the principle of the present invention. Since substantially the specific gravity of the resin is small, it is easy to float when the fluidized bed 3 is loaded. Here, the inventors of the present invention thought that by supplying the resin to the lower region of the fluidized bed 3, the reaction can be efficiently performed during the floating process. However, since the lower region of the fluidized bed 3 must be set to be higher than the thermal decomposition temperature of the resin, the usual charging method such as a feeder is used, and the possibility that the inlet is blocked is high, so that it is difficult to apply. Here, in the present invention, the granular resin is blown into the lower region of the fluidized bed 3 by the carrier gas. Since the blown-in granular resin moves (floats) from the lower region of the fluidized layer 3 to the upper region, a thermal decomposition gasification reaction can be generated in the process, so that the entire region of the fluidized layer 3 can be effectively used. The gasification reaction is thermally decomposed. Since the fluidized bed 3 is substantially in a flowing state, the void ratio is high, so that the granular resin can be blown at a lower flow rate of the blowing gas than in the case of blowing the packed bed.

Furthermore, the flow medium used in the fluidized layer may vary depending on the type thereof, but has a certain particle size distribution (particle size width), wherein the flow medium having a larger particle size has poor fluidity and is liable to stay in the lower region of the fluidized layer. Therefore, there is a problem that the entire fluidized layer does not fully exert the function of the flowing medium. However, in order to solve this problem, the present invention causes the fluidized layer to be blown by obliquely blowing the lower region of the fluidized layer 3 toward the lower portion of the fluidized layer 3. 3 The flow state of the flowing medium in the lower region is activated to prevent the flow layer The lower region of 3 retains a flow medium having a large particle size. Therefore, the entire fluidized bed can fully exert the function of the flowing medium, and the reaction speed of the heat transfer rate or thermal decomposition of the resin can be greatly improved. Further, in the present invention, since the resin material is clogged with the raw material inlet of the fluidized bed due to the molten resin, since the resin is loaded into the fluidized bed at a high speed according to a certain solid-gas ratio, there is almost no resin due to melting. This causes the raw material inlet (blowing inlet 2) to be blocked.

According to the above, the present invention can efficiently perform thermal decomposition of an organic substance such as a resin.

In FIG. 1, the blowing inlet 2 is connected to the blowing pipe 8 (blowing pipe for blowing), and the particulate organic matter conveyed by the gas by the supply pipe 9 is blown into the fluidized bed 3 from the blowing inlet 2 via the blowing pipe 8. Further, the air inlet 2 may be provided in a plurality of places in the circumferential direction of the furnace.

In the present invention, the blowing angle (the downward blowing angle) of the particulate organic material from the inlet 2 is not particularly limited as long as it is at least 0 degrees (horizontal), and the effect or prevention of the invention is prevented. The viewpoint that the blowing inlet 2 is blocked is preferably about 25 to 45 degrees. That is, the blowing direction of the particulate organic substance is preferably inclined at an inclination angle θ of 25 to 45° downward with respect to the horizontal direction. If the inclination angle θ is less than 25°, the effect of blowing the granular organic substance into the lower region of the fluidized layer 3 in the obliquely downward direction becomes small, and when the particulate organic substance is blown in, the flowing medium is easily entered. When blowing into the tube 8, there is a case where the blowing inlet 2 or the blowing tube 8 is blocked. On the other hand, when the inclination angle θ exceeds 45°, the flow rate of the conveying gas at the tip end of the blowing pipe 8 (the blowing inlet 2) is lowered, and the conveyance of the particulate organic substance is likely to be lowered.

The installation height position of the air inlet 2 is not particularly limited. Since the particulate organic material is blown into the lower region of the fluid layer 3 in the obliquely downward direction through the air inlet 2, the inner diameter D of the air inlet 2 and the fluid layer are 3 lower end position to the lower end of the blow inlet 2 The height h of the position and the stationary medium height L of the flowing medium (the height L of the flowing medium when the flowing gas is in a stationary state) preferably satisfy the following formula (1): 3D≦h≦L/3...(1) )

When h>L/3, since the position of the blowing inlet 2 is too high, it is difficult to blow the particulate organic substance into the lower region of the fluidized bed 3. On the other hand, if 3D>h, since the position of the blowing inlet 2 is too low, the blowing gas reaches the gas dispersion portion at the lower end of the fluidized bed, and there is a possibility that the blowing gas flows back to the inlet of the decomposition gas.

The type of the flowing gas (gasifying agent) to be supplied to the fluidized bed 3 is not particularly limited, and a known flowing gas (gasifying agent) can be used. For example, the mixed gas disclosed in Japanese Patent Laid-Open No. 2014-37524 (including: The metallurgical furnace generates a carbon monoxide-containing exhaust gas, adds excess water vapor to carry out a conversion reaction, and uses hydrogen and carbonic acid gas generated by the conversion reaction, and a mixed gas of water vapor which is not consumed in the conversion reaction).

The type of the carrier gas (injection gas) of the particulate organic material is not particularly limited, and for example, one or more gases including N ₂ and CO ₂ may be used. From the viewpoint of promoting the thermal decomposition reaction of the particulate organic substance in the fluidized bed 3, a part or all of the transport gas preferably contains a gas which becomes a gasifying agent of the particulate organic substance in the fluidized layer 3 (will be organic a gas that reacts with a substance to promote its decomposition). Such a gas system which becomes a gasifying agent can be CO ₂ . Therefore, the carrier gas is preferably a gas containing CO ₂ , particularly a gas having a high CO ₂ concentration. For example, the combustion exhaust system of the hot-blast stove for a blast furnace contains CO ₂ of about 25%, and is suitable as a carrier gas.

In order to ensure the transportability of the organic substance, it is preferred to carry the gas at a temperature of 50 ° C or less and do not contain oxygen.

The transport gas must be set to a flow rate in which a space known as a raceway can be formed in the fluidized bed 3 by the blow. If the flow path cannot be formed, the granular organic matter cannot be Intrusion into the inside of the fluidized bed may cause clogging in the blowing pipe 8. Since the limit flow rate of the flow path is greatly affected by the inner diameter of the blow inlet 2, the particle size, the shape, the void ratio, and the flow state of the flow medium, it is preferably determined in advance using a model experiment that can be internally observed.

The flowing medium is preferably a metal-based powder or granule which can exhibit the function of decomposing the organic substance. As such a powder system, a well-known Ni-based modified catalyst or a Ni-based hydrogenation catalyst can be used. It is preferable to use dust generated by various steps of an iron-making plant because it has a high activity of containing a large amount of iron, is suitable as a flow medium because it is a fine particle, and can be obtained in a large amount and inexpensive. That is, the ironworks produces dust. A representative example of the dust generated by the ironworks may be converter dust, but is not limited thereto. Among the dust generated by the ironworks, the converter dust is most suitable as a flow medium with catalytic function because of its high iron content ratio and high thermal conductivity. The so-called converter dust is the iron-containing dust generated in the steel making step performed by the converter. The steelmaking step may, for example, be a dephosphorization step, a decarburization step, a stainless steel refining step, etc., but is not limited thereto.

[Examples]

A gasification test for vaporizing waste plastic pellets at 600 ° C was carried out using the fluidized bed gasification test apparatus shown in Fig. 3 . The flow layer 3 (flow layer gasifier) has a pipe diameter of 66 mm, and the flow medium uses converter dust. The height L when the flowing medium is stationary is set to 198 mm. The flowing gas (gasifying agent) is a mixed gas of H ₂ , N ₂ , CO ₂ , and H ₂ O supplied at 4 L/min. The use of granular waste plastics will be formed into a ring shape of about 6 mm using a ring die forming machine. The waste plastic pellets of ×15 mm were subjected to freeze pulverization, and sieved by a sieve having a hole of 2.0 mm, and then the sieved objects were recovered. The average diameter of the krummbein diameter is about 1 mm.

In the example of the present invention, the waste plastic pellets charged into the hopper 10a are cut by a table feeder 11a (cutting speed 300 g/h), and the waste plastic pellets cut according to the quantitative use are used to contain CO ₂ : 25 vol. %, N ₂ : 75 vol% of the transport gas (the transport gas supplied from the gas cylinders 12 and 13 by the gas supply pipe 14) is gas-transported, and is at a height h: 30 mm from the lower end (distribution plate 5) of the fluidized bed 3 The blown inlet 2 (inner diameter D: 10 mm) provided was blown into the fluidized bed 3 at an inclination angle θ: 30° to be loaded.

In order to supply the waste plastic from the upper portion of the apparatus, the hopper 10b is provided on the upper portion of the fluidized bed 3, and the waste plastic pellets are quantitatively cut by the table feeder 11b to be supplied from the upper portion of the fluidized bed 3. In the comparative example, the waste plastic pellets charged into the hopper 10b were cut out by a table feeder 11b (cutting speed: 300 g/h), and the waste plastic pellets cut out by the quantitative amount were dropped in the fluidized bed 3.

The gas system in the fluidized bed 3 is taken out through the discharge pipe 7, cooled by the gas cooler 15 (18-stage gas trap), and the gas flow rate is continuously measured by the mass flow meter 16, and the gas composition is further measured by the gas phase chromatography analyzer 17. .

With respect to the inventive examples and comparative examples, the gas low calorific value and the gasification rate were calculated from the gas generation amount and the gas composition, and the results are shown in Table 1. In addition, the gasification rate is obtained by the following formula, and the "gasification raw material" is a waste plastic pellet.

F=(G×C2)/(M×C1)×100

Among them, F: gasification rate (%)

M: supply of gasification raw materials (kg/h)

G: amount of generated gas (kg/h)

C1: carbon concentration in the gasification raw material (%)

C2: carbon concentration in the generated gas (%)

The present invention example in which waste plastic pellets are blown into the lower portion of the fluidized layer can continuously supply the waste plastic pellets without any problem, but the comparison of the supply of the waste plastic pellets from the upper portion of the fluidized layer For example, since the temperature near the supply port rises and the molten waste plastic blocks the supply port, the waste plastic supply port of the upper flange is air-cooled by a blower, and the result is continuously supplied.

In the comparative example, the calorific value of the generated gas was 3,870 kcal/Nm ³ and the gasification rate was 41%. In the example of the present invention, the calorific value and the gasification rate of the generated gas both increased, and the calorific value was 4,950 kcal/Nm ³ . The rate of conversion is 68%.

1‧‧‧ Thermal decomposition furnace

2‧‧‧Blowing the entrance

3‧‧‧Mobile layer

4‧‧‧ gas supply pipe

5‧‧‧Dispersion board

6‧‧‧Windbox Department

7‧‧‧Draining tube

8‧‧‧Blow in tube

9‧‧‧Supply tube

Claims (14)

A method for thermally decomposing an organic substance, which is a method for thermally decomposing a granular organic substance in a fluidized bed thermal decomposition furnace, characterized in that a granular organic substance to be thermally decomposed is passed through a thermal decomposition furnace (1) The blowing inlet (2) provided on the lower side surface is blown downward in the downward direction of the flow layer (3). The thermal decomposition method of the organic substance according to claim 1, wherein the direction in which the granular organic substance is blown in the lower portion of the fluidized layer (3) has an inclination angle of 25 to 45° with respect to the horizontal direction. The thermal decomposition method of the organic substance according to claim 1 or 2, wherein a part or all of the transport gas of the particulate organic substance contains a gas which becomes a gasifying agent of the particulate organic substance in the fluidized bed (3). The thermal decomposition method of the organic substance according to any one of claims 1 to 3, wherein an inner diameter D of the blowing inlet (2) is provided in the thermal decomposition furnace, from a lower end position of the fluid layer (3) to a blowing inlet ( 2) The height h of the lower end position and the stationary medium height L of the flowing medium satisfy the following formula (1): 3D≦h≦L/3 (1). The method of thermal decomposition of an organic substance according to any one of claims 1 to 4, wherein the flowing medium comprises dust generated by an ironworks. A method for producing a thermally decomposed product of an organic substance, which is a method for thermally decomposing a particulate organic substance in a fluidized bed thermal decomposition furnace and producing a thermally decomposed product of an organic substance, characterized in that it is to be thermally decomposed The granular organic substance is blown in the obliquely downward direction to the lower portion of the fluidized bed (3) through the blowing inlet (2) provided on the lower side of the thermal decomposition furnace (1). A method for producing a thermal decomposition product of an organic substance according to claim 6, wherein The granular organic matter in the lower portion of the fluidized layer (3) is blown in a direction having an inclination angle of 25 to 45° with respect to the horizontal direction. The method for producing a thermal decomposition product of an organic substance according to claim 6 or 7, wherein a part or all of the transport gas of the particulate organic substance is contained in the fluidized layer (3) to become a gasifying agent of the particulate organic substance. gas. The method for producing a thermal decomposition product of an organic substance according to any one of claims 6 to 8, wherein an inner diameter D of the blowing inlet (2) provided in the thermal decomposition furnace is from a lower end position of the fluidized layer (3) The height h to the lower end position of the blowing inlet (2) and the stationary medium height L of the flowing medium satisfy the following formula (1): 3D≦h≦L/3 (1). The method for producing a thermal decomposition product of an organic substance according to any one of claims 6 to 9, wherein the flowing medium contains dust generated by the ironworks. A thermal decomposition furnace for organic substances, which is a fluidized bed thermal decomposition furnace for thermally decomposing organic substances, characterized in that a blowing inlet (2) is provided on a lower side of the furnace body, and the blowing inlet (2) is The granular organic substance is blown downward in the lower portion of the flow layer formed in the furnace. A thermal decomposition furnace for an organic substance according to claim 11, wherein the direction in which the particulate organic substance is blown from the blowing inlet (2) to the lower portion of the fluidized bed has an inclination angle of 25 to 45 degrees with respect to the horizontal direction. A thermal decomposition furnace for an organic substance according to claim 11 or 12, wherein the blowing inlet (2) is connected to the blowing pipe (8), and the blowing pipe (8) is connected to the gas conveying supply pipe (9) of the granular organic substance. . A thermal decomposition furnace for an organic substance according to any one of claims 11 to 13, wherein the inner diameter D of the blowing inlet (2), from the lower end position of the fluid layer to the lower end position of the blowing inlet (2) The height h and the static height L of the flowing medium satisfy the following formula (1): 3D≦h≦L/3 (1).