Industrial furnace

Abstract

To provide a novel industrial furnace which can effectively use dry distillation gas as fuel without waste, resulting in effective reduction in cost required for thermal decomposition of organic matter.SOLUTION: An industrial furnace includes: a combustion chamber 20 which has a predetermined length and which is formed outside carbonization boxes 11, 12 in which matter to be treated containing organic matter is housed; a combustion burner 31 which radiates combustion gas from the base end side of the combustion chamber 20 in a longitudinal direction of the combustion chamber; a dry distillation gas burner 41 which is disposed near the combustion burner 31; and a dry distillation gas flow channel 15 which is on one end thereof in communication with the inside of the carbonization boxes 11, 12 and is on the other end thereof in connection with the dry distillation gas burner 41. The radiation direction of dry distillation gas supplied from the end of the dry distillation gas burner 41 is configured to cross the radiation direction of the combustion gas radiated by the combustion burner 31.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an industrial furnace such as a carbonization furnace, an incinerator, or the like, for thermally decomposing materials to be treated. [Background technology]

[0002] Various industrial furnaces, such as carbonization furnaces (pyrolysis furnaces) and incinerators, are used to thermally decompose materials stored in the furnaces using burners. The materials are waste materials containing organic matter, and in recent years, lithium-ion batteries have often been thermally decomposed in carbonization furnaces, which are one type of industrial furnace, in order to recover valuable materials such as lithium, nickel, and cobalt contained in the materials.

[0003] A conventional carbonization furnace (industrial furnace) disclosed in Japanese Patent Laid-Open Publication No. 2022-164399 (Patent Document 1) has been proposed. This carbonization furnace includes a combustion chamber formed on the underside of the side of the carbonization furnace and having a horizontal length, and a combustion burner is disposed outside the carbonization furnace to heat the interior of the combustion chamber to a high temperature. This combustion burner burns fossil fuel (kerosene or gas), and the tip of the combustion burner is located within the combustion chamber. In addition, a heating chamber is provided near the combustion chamber in which the workpiece contained in a box-shaped container is placed, and the workpiece is carbonized (pyrolyzed) by the heat in the combustion chamber. One end of a pyrolysis gas duct communicating with the container containing the material to be treated is fixed to the container, with a midpoint of the pyrolysis gas duct exposed to the outside of the carbonization furnace, and the other end of the pyrolysis gas duct connected to a pyrolysis gas burner (blower) located near the combustion burner. This pyrolysis gas burner (blower) uses the pyrolysis gas generated by the heat treatment of the material to be treated as fuel. By using the pyrolysis gas burner (blower) separately from the combustion burner (as a component of the carbonization furnace), fuel costs during use are reduced. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2022-164399 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the carbonization furnace disclosed in Patent Document 1, the distillation gas supplied by the distillation gas burner (blower) and the flame from the combustion burner are supplied separately into the combustion chamber facing in the same direction (both horizontally), so the distillation gas supplied by the distillation gas burner (blower) is not sufficiently stirred in the combustion chamber, and the distillation gas supplied from the distillation gas burner cannot be effectively used as fuel.

[0006] Therefore, the present invention has been proposed to solve the problems associated with the conventional carbonization devices (industrial furnaces) described above, and aims to provide a new industrial furnace that can effectively utilize dry distillation gas as fuel without waste, thereby effectively reducing the costs required for the thermal decomposition of organic matter. [Means for solving the problem]

[0007] The present invention has been proposed to solve the above-mentioned problems, and the first invention (the invention described in claim 1) comprises a carbonization box in which the material to be treated, including organic matter, is housed, a combustion chamber formed outside the carbonization box and having a predetermined length, a combustion burner that radiates combustion gas from the base end side of the combustion chamber in the longitudinal direction of the combustion chamber, a carbonization gas burner arranged near the combustion burner, and a carbonization gas flow path having one end connected to the carbonization box and the other end connected to the carbonization gas burner, and is characterized in that the radiation direction of the carbonization gas supplied from the tip of the carbonization gas burner is a direction that intersects the radiation direction of the combustion gas by the combustion burner.

[0008] In the industrial furnace according to the first invention, the radiation direction of the distillation gas emitted from the distillation gas burner is set to a direction that intersects with the radiation direction of the combustion gas emitted from the combustion burner, so that the distillation gas emitted by the distillation gas burner can be sufficiently mixed with the combustion gas, and the distillation gas can be effectively used as fuel for the heat treatment of the material to be treated.

[0009] In this first aspect of the invention, the fuel gas emitted by the combustion burner includes, in addition to natural gas, vaporized liquid fossil fuels such as petroleum. The direction of emission of the carbonization gas emitted from the carbonization gas burner needs only to be a direction intersecting the direction of emission of the combustion gas emitted by the combustion burner. This intersecting angle may be an angle at right angles to each other, i.e., when the direction of emission of the combustion gas emitted by the combustion burner is horizontal and the direction of emission of the carbonization gas emitted from the carbonization gas burner is downward, or may be an acute angle (a direction at an oblique intersection) between the direction of emission of the combustion gas and the direction of emission of the carbonization gas. When the emission directions are orthogonal to each other, the fuel gas and the carbonization gas can be more effectively mixed than when they are obliquely intersecting each other.

[0010] In addition, the second invention (the invention described in claim 2) is characterized in that, in the first invention, a gas mixing chamber is formed on the combustion burner side of the combustion chamber, which is connected to the combustion chamber and inside which the combustion gas emitted from the combustion burner and the carbonization gas emitted from the carbonization gas burner are mixed, and this gas mixing chamber is provided with one space into which the tip side of the combustion burner is inserted and another space into which the tip side of the carbonization gas burner is inserted.

[0011] In the industrial furnace of the second invention, the fuel gas emitted from the combustion burner and the distillation gas emitted from the distillation gas burner are effectively mixed in the gas mixing chamber, making it possible to effectively utilize the distillation gas without waste.

[0012] In addition, the third invention (the invention described in claim 3) is characterized in that, in the second invention, the distillation gas burner connected to the distillation gas flow path is cylindrically shaped and arranged facing downward, and at least a part of the distillation gas burner is housed in an outer cylinder whose lower end is positioned toward the gas mixing chamber, and a combustion air inlet space is formed between the outer surface of the distillation gas burner and the inner surface of the outer cylinder into which combustion air blown from a blower through a duct flows in, and the combustion air flowing into the combustion air inlet space is supplied to the tip side of the distillation gas burner in a vortex state by a vortex mixing structure, so that the distillation gas emitted from the distillation gas burner and the vortex-shaped combustion air are mixed with each other.

[0013] In the industrial furnace of the third invention, the vortex mixing structure allows the combustion air blown from the blower through the duct to be supplied to the lower end of the carbonization gas burner in a vortex state, and the carbonization gas emitted from the lower end of the carbonization gas burner is mixed with the vortex combustion air at the tip side of the carbonization gas burner, so that the carbonization gas can be used even more effectively as a heat source for the heat treatment of the workpiece.

[0014] Furthermore, the fourth invention (the invention described in claim 4) is characterized in that, in the above-mentioned third invention, the outer cylinder comprises an upper outer cylinder which is arranged at the upper end side of the dry distillation gas burner and formed in a cylindrical shape, and a lower outer cylinder whose upper end is connected to the lower side of the upper outer cylinder and whose diameter is smaller than the inner diameter of the upper outer cylinder, and the vortex mixing structure is provided with a combustion air inlet through which combustion air blown from the blower through the duct flows in an eccentric direction different from the axial direction of the upper outer cylinder.

[0015] In the industrial furnace according to the fourth aspect of the present invention, combustion air is blown into the upper outer cylinder through the combustion air inlet, which constitutes the swirling mixing structure, in an eccentric direction different from the axial center of the upper outer cylinder (rather than the radial direction of the upper outer cylinder), which has a larger diameter than the lower outer cylinder. Therefore, a large vortex (long-diameter vortex) forms in the cylindrical space formed between the outer peripheral surface of the upper half of the carbonization gas burner and the inner peripheral surface of the upper outer cylinder. This large vortex eventually flows into the narrow space formed between the inner peripheral surface of the lower outer cylinder, which has a smaller diameter than the inner diameter of the upper outer cylinder, and the inner peripheral surface of the carbonization gas burner, maintaining its vortex state. The flow velocity accelerates as the combustion air reaches the lower end of the carbonization gas burner. Therefore, the industrial furnace according to the fourth aspect of the present invention allows the carbonization gas to be more effectively used as a heat source for heat treatment of the workpiece.

[0016] Furthermore, the fifth invention (the invention described in claim 5) is characterized in that, in either the third or fourth invention, a gas mixing blade for mixing the distillation gas emitted from the distillation gas burner with the combustion air is arranged further below the lower end of the distillation gas burner, inside the outer cylindrical body described in claim 3 or inside the lower outer cylindrical body described in claim 4.

[0017] In the industrial furnace according to the fifth invention, which cites the third invention, the lower end of the carbonization gas burner is positioned higher than the lower end of the outer cylindrical body constituting the third invention, and therefore the carbonization gas emitted from the lower end of the carbonization gas burner passes through the middle of the lower end of the outer cylindrical body for a while, and inside the outer cylindrical body, the combustion air flows downward in a vortex-like flow due to the vortex mixing structure, and therefore the carbonization gas and the vortex-like combustion air are mixed by the gas mixing blade constituting the fifth invention and reach the gas mixing chamber. In the fifth invention, which cites the fourth invention, the lower end of the carbonization gas burner is located above the lower end of the lower outer cylinder constituting the fourth invention, so that the carbonization gas emitted from the lower end of the carbonization gas burner passes through the middle of the lower end of the lower outer cylinder for a while, and inside the lower outer cylinder, the combustion air flows downward in a vortex state due to the vortex mixing structure, so that the carbonization gas and the vortex-shaped combustion air are mixed by the gas mixing impeller constituting the fifth invention and reach the gas mixing chamber. Therefore, in the industrial furnace according to the fifth invention, the carbonization gas supplied from the carbonization gas burner and the combustion air are mixed by the gas mixing impeller and supplied (flows into) the gas mixing chamber, so that the carbonization gas can be more effectively used as a heat source for heat treatment of the workpiece.

[0018] Furthermore, the sixth invention (the invention described in claim 6) is characterized in that, in any of the second, third or fourth inventions, another vortex mixing structure is provided which supplies combustion air from a blower through a duct into the gas mixing chamber, thereby causing the combustion gas emitted from the combustion burner and the distillation gas emitted from the distillation gas burner to swirl and mix the combustion gas, the distillation gas and the combustion air.

[0019] In the sixth invention, the fuel gas emitted from the combustion burner, the carbonization gas emitted from the carbonization gas burner, and the combustion air supplied from the blower (a total of three types of gases) are all mixed, and this mixed gas (three types of mixed gases) is swirled in the gas mixing chamber by the other vortex mixing structure and combusted. Therefore, with the industrial furnace according to the sixth invention, the carbonization gas can be more effectively used as a heat source for the heat treatment of the workpiece.

[0020] The blower constituting the sixth invention may be the same as the blower constituting the third invention, or may be a separate blower. That is, when the same blower as the blower constituting the third invention is used, the sixth invention provides another duct branching off from the middle of the duct connected to the blower constituting the third invention, and the combustion air is supplied into the gas mixing chamber through this other duct.

[0021] The seventh invention (the invention described in claim 7) is characterized in that, in the sixth invention, the other vortex mixing structure comprises a cylindrical space formed in the gas mixing chamber and having a length in the horizontal direction, and another combustion air inlet that allows the combustion air blown from the blower through the duct to flow into this cylindrical space in an eccentric direction different from the axial direction of the cylindrical space.

[0022] In the industrial furnace according to the seventh invention, when the combustion air from the blower is supplied through the duct to the other combustion air inlet having the other vortex mixing structure into the cylindrical space formed in the gas mixing chamber, the other combustion air inlet flows in an eccentric direction different from the axial direction (radial direction) of the cylindrical space, causing the combustion air to swirl in the gas mixing chamber. Therefore, even in the industrial furnace according to the seventh invention, the dry distillation gas can be used more effectively as a heat source for heat treatment of the workpiece. [Effects of the Invention]

[0023] According to the above inventions, the dry distillation gas can be effectively used as fuel without waste, and thus the cost required for thermal decomposition of organic matter can be effectively reduced. In particular, according to the industrial furnace of the third or fourth invention, which has a vortex mixing structure as a constituent element, the dry distillation gas can be more effectively used as a heat source for the heat treatment of the material to be treated. Furthermore, according to the industrial furnace of the sixth or seventh invention, which has another vortex mixing structure as a constituent element, in which combustion air blown from a blower through a duct is supplied into the gas mixing chamber in a vortex shape, the dry distillation gas can be even more effectively used as a heat source for the heat treatment of the material to be treated. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a front cross-sectional view of a carbonization furnace according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the carbonization furnace shown in FIG. [Figure 3] FIG. 2 is a right-side cross-sectional view of the carbonization furnace shown in FIG. [Figure 4] FIG. 2 is a front cross-sectional view showing the configuration of a combustion chamber, a mixing chamber and their surroundings of the carbonization furnace shown in FIG. [Figure 5] 2 is a cross-sectional plan view showing the configuration of a combustion chamber, a mixing chamber and their surroundings of the carbonization furnace shown in FIG. 1. FIG. [Figure 6] FIG. 2 is a front cross-sectional view showing the configuration of a gas mixing chamber and its surroundings. [Figure 7] FIG. 2 is a left side view showing the piping state of the blower and the duct. [Figure 8] FIG. 2 is a cross-sectional view showing the configuration of a dry distillation gas burner and its surroundings. [Figure 9] 1A and 1B show a gas mixing vane, in which FIG. 1A is a plan view thereof and FIG. 1B is a side view thereof. [Figure 10] FIG. 2 is a cross-sectional view showing the configuration of a gas mixing chamber and its surroundings. DETAILED DESCRIPTION OF THE INVENTION

[0025] An industrial furnace according to a best mode for carrying out the present invention will be described in detail below with reference to the drawings. In this embodiment, the industrial furnace according to the present invention is applied to a carbonization furnace.

[0026] 1 to 3, the carbonization furnace 1 has an overall external shape formed into a rectangular parallelepiped having a length in the horizontal direction, and includes a bottom 2 formed into a substantially rectangular shape, a left wall 3 rising from the left end of the bottom 2, a right wall 4 rising from the right end of the bottom 2 and facing the left wall 3, a front wall 5 rising from the front end of the bottom 2, a back wall 6 rising from the rear end of the bottom 2 and facing the front wall 5, and a ceiling 7. Heat insulating materials (reference numerals omitted) made of inorganic materials such as insulating tiles or insulating wool are fixed to the upper surface of the bottom 2 and the inside of the left wall 3, right wall 4, front wall 5, back wall 6, and ceiling 7. In addition, rectangular openings (reference numerals omitted) are formed on the left and right sides of the front wall 5, and as shown in Figure 2, the left opening is closed by a left opening door 8 and the right opening is closed by a right opening door 9.

[0027] 1 or 2, a heating chamber (reference numeral omitted) is provided within the carbonization furnace 1, and first and second (plurality of) carbonization boxes 11, 12 are disposed within the heating chamber. The first and second carbonization boxes 11, 12 are each formed in a box shape, supported by the upper ends of a plurality of support columns 13 erected from the bottom 2, and each open on the front side. As shown in FIG. 2, these open areas are closed by the left opening door 8 and the right opening door 9, and when the openings formed on the front sides of the first and second carbonization boxes 11, 12 are closed by the left opening door 8 and the right opening door 9, the interiors of the boxes become sealed spaces.

[0028] 1 or 2, the first carbonization box 11 and the second carbonization box 12 are connected to each other by a connecting pipe 14, and the interior of the first carbonization box 11 and the interior of the second carbonization box 12 are in communication with each other. Also, to the middle of the upper end of the first carbonization box 11, as described below, a base end of a pyrolysis gas transfer pipe 15 is fixed, which transfers pyrolysis gas generated by carbonization (pyrolysis or heat treatment) of the material to be treated in the first and second carbonization boxes 11, 12 toward a pyrolysis gas burner 41, described below, and the inside of the pyrolysis gas transfer pipe 15 is in communication with the inside of the first carbonization box 11. Therefore, the pyrolysis gas generated in the first carbonization box 11 and the pyrolysis gas generated in the second carbonization box 12 pass through the connecting pipe 14 and flow into the first carbonization box 11, and then flow into the pyrolysis gas transfer pipe 15. The connecting pipe 14 is a pyrolysis gas flow path constituting the present invention.

[0029] 1 or 3, a plurality of carbonization containers 17, each containing an object to be treated (not shown), are housed in the first and second carbonization boxes 11, 12, stacked one on top of the other. These carbonization containers 17 are carried into the first and second carbonization boxes 11, 12, which are opened by opening the left opening door 8 and the right opening door 9, and are stacked one on top of the other. When the carbonization process in the carbonization furnace 1 is completed, the left opening door 8 and the right opening door 9, which had been closed until then, are opened, and the carbonization containers 17 are carried out from the first and second carbonization boxes 11, 12 to the outside.

[0030] 3 or 4, a combustion chamber 20 is formed within the carbonization furnace 1 along the rear wall 6. As shown in FIG. 3, the combustion chamber 20 is surrounded by an inner surface 20a at the lower end of the rear wall 6, a top plate 20b, a partition 20c facing the inner surface 20a at the lower end of the rear wall 6, and an insulating floor 20d fixed to the upper surface of the bottom 2, and is a space extending from the left wall 3 side to the right wall 4 side of the carbonization furnace 1, as shown in FIG. 4. An L-shaped rear exhaust pipe 21 is formed on the right wall 4 side of the combustion chamber 20 and communicates with the combustion chamber 20, and the lower end of a rear exhaust duct 22, which has an open / close damper (not shown) disposed midway, is fixed to the upper end of the rear exhaust pipe 21. As shown in FIG. 3, the height of the top plate 20b constituting the combustion chamber 20 is slightly higher than the lower surfaces of the first and second carbonization boxes 11 and 12. The top plate 20b has a number of openings 20e formed therein, as shown in FIG. 2 or 4. These openings 20e are spaces through which heated air in the combustion chamber 20 is supplied to the first and second carbonization boxes 11 and 12, as will be described later. As shown in FIG. 1 or 5, an exhaust chamber 23 is formed inside the front wall 5 of the carbonization furnace 1, parallel to the combustion chamber 20. An L-shaped front exhaust pipe 24 is formed on the right wall 4 side of the exhaust chamber 23, outside the right wall 4. The lower end of a front exhaust duct 25, which has an open / close damper (not shown) disposed midway, is fixed to the upper end of the front exhaust pipe 24. The upper end of this front exhaust duct 25 is connected to the rear exhaust duct 22 .

[0031] 4 or 5, a refractory molded member 28 made of a refractory material such as alumina (aluminum oxide) and formed into the illustrated shape is fixed to the lower rear surface of the left wall 3 of the carbonization furnace 1. The refractory molded member 28 has a cubic outer shape and includes a protruding portion 28a that protrudes leftward from the outer surface of the left wall 3 in its entirety. The refractory molded member 28 also includes a flange portion 28b (see FIG. 4) formed on the right side of the protruding portion 28a and fixed within a rectangular opening (reference numeral omitted) formed in the left wall 3. The gas mixing chamber 28c includes a cylindrical first space 28d formed approximately in the center of the protruding portion 28a and a second space 28e that gradually expands in diameter from the tip of the first space 28d to the right of the refractory molded member 28 and that communicates with the combustion chamber 20. The first space 28d is a cylindrical space constituting the present invention. A cylindrical horizontal insertion space 28f having a diameter smaller than the inner diameter of the first space 28d is formed on the left side of the first space 28d. A vertical insertion space 28g is formed from the upper surface of the protruding portion 28a into the first space 28d. Furthermore, the protruding portion 28a is provided with an air flow duct 28h (see FIG. 10) extending from the surface of the protruding portion 28a into the first space 28d and guiding combustion air (outside air) described below into the first space 28d. A lower combustion air inlet 28i is formed on the inner circumferential surface of the protruding portion 28a in which the cylindrical first space 28d is formed, as shown in FIG. 10, and communicates with the air flow duct 28h while facing in an eccentric direction different from the axial direction (radial direction) of the first space 28d. The horizontal insertion space 28f is one space constituting the present invention, and the vertical insertion space 28g is the other space constituting the present invention.

[0032] A combustion burner 31 is fixed to the left side of the refractory molded member 28. This combustion burner 31 uses natural gas as a combustion material and is a gas burner commonly used in conventional carbonization furnaces. It includes a fan (not shown), a damper disposed in the air transport passage of the fan, a manifold, a pilot burner, and a gas supply passage whose base end is connected to a gas pipe or the like. The tip of the combustion burner 31 is formed with a burner-side cylindrical portion 32 (shown in FIG. 4). This burner-side cylindrical portion 32 is fixed to the left side of the refractory molded member 28 while inserted into a cylindrical horizontal insertion space 28f formed in the refractory molded member 28. When the combustion burner 31 is driven, the combustion material gas blown from the fan is ignited by the pilot burner, and the resulting flame is sprayed toward the gas mixing chamber 28c.

[0033] 2 or 3, the middle part of the carbonization gas transfer pipeline 15 passes through an opening (reference numeral omitted) formed in the left wall portion 3 and reaches the outside of the carbonization furnace 1, and as shown in Fig. 6, a flange portion 15a formed on the outer periphery of the tip of the carbonization gas transfer pipeline 15 constitutes a four-way cross pipe 35 and is fixed to a third flange portion 35h described later. Note that, as shown in Fig. 1, the opening formed in the left wall portion 3 is exposed to the outside from a position below the middle position of the height of the left wall portion 3, constitutes the four-way cross pipe 35, and is fixed to a third flange portion 35h described later. As shown in Figures 6 and 8, the four-way cross pipe 35 has four pipe sections (first to fourth pipe sections) 35a...35d arranged vertically and horizontally from the center. A first flange section 35e is formed on the outer periphery of the tip of the first pipe section 35a, and the first flange section 35e is closed by a disk-shaped upper closing plate 36. A second flange section 35f is formed on the outer periphery of the tip of the second pipe section 35b, and the second flange section 35f is closed by a disk-shaped left closing plate 37. The upper end of a cylindrical carbonization gas burner 41 is fixed to the lower end of the third pipe section 35c. A third flange section 35h is formed on the outer periphery of the tip of the fourth pipe section 35d, and the flange section 15a formed on the outer periphery of the tip of the carbonization gas transfer pipeline 15 is fixed to the third flange section 35h. Therefore, the distillation gas that has passed through the distillation gas transfer pipeline 15 flows from the fourth pipe section 35d that constitutes the four-way cross pipe 35 through the third pipe section 35c and into the distillation gas burner 41.

[0034] 8, the inner peripheral surface of a hollow flange disk 42 is welded to the outer peripheral surface of the carbonization gas burner 41 at the outer periphery of the upper midpoint of the carbonization gas burner 41. A hollow disk-shaped spacer 43 is fixed to the underside of the flange disk 42, and a cylindrical box 44 having an upper outer cylinder 44b (described later) as a component is disposed on the underside of the disk-shaped spacer 43. The cylindrical box 44 includes a disk-shaped top plate 44a fixed to the underside of the disk-shaped spacer 43, an upper outer cylinder 44b (described later) that hangs down from the outer periphery of the underside of the disk-shaped top plate 44a and is cylindrically shaped and has the upper midpoint of the carbonization gas burner 41 positioned in its center, and a disk-shaped bottom plate 44c whose outer peripheral side is fixed to the lower end of the upper outer cylinder 44b. At the center of the disk-shaped bottom plate 44c, there are formed circular openings (reference numerals omitted) through which the intermediate portion of the innermost dry distillation gas burner 41, the heat insulating cylindrical body 45 described later that is disposed outside the dry distillation gas burner 41, and the intermediate portion of the upper end of the lower external cylinder 52 described later are inserted. The upper external cylinder 44b is formed with an upper combustion air inlet 44d that is connected to the tip of one duct 57 whose base end is fixed to a three-way cross pipe 56 described later and that allows combustion air to flow into the upper external cylinder 44b. As shown in Fig. 8, the upper combustion air inlet 44d introduces combustion air in an eccentric direction different from the axial direction of the upper outer cylinder 44b. The combustion air flowing into the upper outer cylinder 44b from the upper combustion air inlet 44d moves downward while spiraling in a donut-shaped space formed between the inner peripheral surface of the upper outer cylinder 44b and the outer peripheral surface of the carbonization gas burner 41. The upper outer cylinder 44b and the lower outer cylinder 52 constitute the outer cylinders of the present invention. The space between the inner surfaces of the upper outer cylinder 44b and the lower outer cylinder 52, which are the outer cylinders, and the outer peripheral surface of the carbonization gas burner 41 constitutes the combustion air inlet space of the present invention. The upper outer cylinder 44b (and the lower outer cylinder 52) and the upper combustion air inlet 44d are components of the swirl mixing structure of the present invention.As shown in Figures 1 and 8, an upper fixing flange 38 is fixed to the outer peripheral surface of the lower end of the upper outer cylinder 44b that constitutes the cylindrical box 44, while an insertion pipe 39 stands upright from the upper surface of the protrusion 28a that constitutes the fire-resistant molded member 28, as shown in Figure 1, and a lower fixing flange 40 is fixed to the upper end of this insertion pipe 39, with its upper surface joined and fixed to the lower surface of the upper fixing flange 38. A lower outer cylinder 52, which will be described later, is inserted into the insertion pipe 39 from the upper end to the lower end, and the lower end of the lower outer cylinder 52, as will be described later, is inserted into the vertical insertion space 28g.

[0035] Further, an insulating cylinder 45 is disposed on the outer periphery of the carbonization gas burner 41, the upper end of which is fixed (welded) to the lower surface of the disk-shaped spacer 43 and the lower end of which is located slightly above the lower end of the carbonization gas burner 41, and an air layer is formed between the inner periphery of the insulating cylinder 45 and the outer periphery of the carbonization gas burner 41. Note that a ring-shaped spacer 46 is formed in an annular shape between the inner periphery of the lower end side of the insulating cylinder 45 and the outer periphery of the carbonization gas burner 41 at a midpoint, and the carbonization gas burner 41 is cooled by the combustion air flowing in from the upper combustion air inlet 44d, and as a result, the carbonization gas passing through the carbonization gas burner 41 is cooled, thereby reducing the adhesion of tar contained in the carbonization gas to the inner periphery of the carbonization gas burner 41. The upper ends of a plurality of (four) connecting rods 47 are welded at equal intervals around the periphery of the carbonization gas burner 41 on the outer peripheral surface of the lower end of the carbonization gas burner 41, below the lower end of the heat insulating cylinder 45. A gas mixing blade 51 is welded to the lower ends of these connecting rods 47. As shown in Figure 9(a) or (b) , this gas mixing blade 51 includes a disk portion 51b with a circular opening 51a formed in the center, a plurality of (four) protruding pieces 51c...51f formed at equal intervals around the periphery of the disk portion 51b, each of whose base ends is continuous with the outer periphery of the disk portion 51b and whose upper surfaces are flush with the upper surface of the disk portion 51b, and blade portions 51g...51j formed at an inclination angle of 45 degrees from one side of each of the protruding pieces 51c...51f.

[0036] 8, a lower outer cylinder 52 having a diameter smaller than the inner diameter of the upper outer cylinder 44b constituting the cylindrical box 44 and larger than the heat insulating cylinder 45 is disposed on the inner peripheral surface of the disk-shaped bottom plate 44c constituting the cylindrical box 44, and the lower end side of the lower outer cylinder 52 is inserted into the vertical insertion space 28g formed in the fire-resistant formed member 28. That is, the space between the outer peripheral surface of the heat insulating cylinder 45 and the inner peripheral surface of the lower outer cylinder 52 is in communication with the interior of the upper outer cylinder 44b, and the space between the inner peripheral surface of the lower outer cylinder 52 and the outer peripheral surface of the heat insulating cylinder 45 is narrower than the space between the inner peripheral surface of the upper outer cylinder 44b and the outer peripheral surface of the heat insulating cylinder 45. The lower outer cylinder body 52 has its outer surface at the upper end fixed to the inner surface of the disk-shaped bottom plate 44c, and its lower end is located below the lower end of the dry distillation gas burner 41 and near the lower end of the gas mixing blade 51. Therefore, as described above, when the combustion air that has been formed into a large swirl in the space between the inner surface of the upper outer cylinder 44b and the outer surface of the insulating cylinder 45 flows into the space between the inner surface of the lower outer cylinder 52 and the outer surface of the insulating cylinder 45, the speed (flow rate) of the swirling combustion air moves downward at a faster speed than before, because the cross-sectional area becomes smaller while the volume per unit time flowing into the space remains constant, and since the lower end of the carbonization gas burner 41 is located above the lower end of the lower outer cylinder 52, the swirling combustion air is released near the gas mixing blade 51 located below the lower end of the carbonization gas burner 41 and diffuses inward, and the carbonization gas released from the lower end of the carbonization gas burner 41 becomes a swirling flow by the gas mixing blade 51. That is, below the gas mixing blades 51, both the combustion air and the dry distillation gas are swirled and effectively mixed with each other, and then supplied into the gas mixing chamber 28c in a mixed state.

[0037] 1, the carbonization furnace 1 according to this embodiment has a blower 54 mounted on a mounting base 53 whose base end is fixed to the outer surface of the left wall portion 3. As shown in FIG. 7, the base end of a main duct 55 is fixed to the blower 54, and a three-way cross pipe 56 is connected to the tip of the main duct 55. The three-way cross pipe 56 is connected to the base end of one duct 57, and the tip of the one duct 57 is connected to the upper combustion air inlet 44d shown in FIG. 6. The three-way cross pipe 56 is connected to the base end of the other duct 58, and the tip of the other duct 58 is connected to the air supply duct 28h (see FIG. 10). Therefore, by driving the blower 54, the combustion air flows into the gas mixing chamber 28c from the lower combustion air inlet 28i, and the combustion air that has flowed into the gas mixing chamber 28c is made swirling. The gas mixing chamber 28c (first space (cylindrical space constituting the present invention) 28d) and the lower combustion air inlet 28i are components of another swirling mixing structure that constitutes the present invention.

[0038] As described above, in the carbonization furnace 1 according to this embodiment, the combustion air is swirled by driving the blower 54, and the dry distillation gas from the dry distillation gas burner 41 is mixed with the combustion air, and further, in the gas mixing chamber 28c, the combustion air from the blower 54 mixes three gases (air bodies): the gas that is the combustion raw material from the combustion burner 31, the mixed gas that has been swirled and flowed into the gas mixing chamber 28c, and the combustion air from the blower 54. Therefore, according to the carbonization furnace 1 according to this embodiment, the dry distillation gas can be used extremely effectively, and the carbonization process (pyrolysis or heat treatment) of the material to be treated can be carried out inexpensively.

[0039] Furthermore, in the carbonization furnace 1 according to this embodiment, the portion of the carbonization gas transfer pipeline 15 that transfers the carbonization gas generated inside the first and second carbonization boxes 11, 12 into the carbonization gas burner 41 and that is exposed to the outside of the carbonization furnace 1 is made considerably shorter than the configuration according to the previously described Patent Document 1. That is, the opening formed in the left wall portion 3 and through which the carbonization gas transfer pipeline 15 is inserted is located below the midpoint of the height of the left wall portion 3, and the carbonization gas burner 41 is disposed below this position. Therefore, in the flow path (path) from the midpoint of the carbonization gas transfer pipeline 15 to the carbonization gas burner 41, the risk of tar cooled by the outside air temperature and contained in the carbonization gas adhering to the flow path and causing clogging can be effectively avoided.

[0040] In other words, in the carbonization apparatus disclosed in Patent Document 1, most of the midway portion of the carbonization gas duct is exposed to the outside from the carbonization furnace and connected to the carbonization gas burner (blower), so the carbonization gas is cooled by outside air, and as a result, a large amount of tar adheres to the inner surface of the carbonization gas duct, significantly narrowing the effective flow space of the carbonization gas duct, and the carbonization gas duct often becomes clogged after long-term use. In this way, when the carbonization gas duct becomes clogged, it becomes necessary to remove the carbonization duct and clean the inside or replace it with a new carbonization gas duct. However, even before the clog, the carbonization gas generated by the heat treatment cannot be supplied in sufficient amount to the combustion burner, making it impossible to use it efficiently as fuel, which hinders efforts to reduce fuel costs. Therefore, according to the carbonization furnace 1 of this embodiment, the risk of tar contained in the distillation gas cooled by the outside air temperature adhering to and clogging the flow path (path) extending from the middle of the distillation gas transfer pipeline 15 to the distillation gas burner 41 can be effectively avoided. [Explanation of symbols]

[0041] 1. Carbonization furnace 11 First carbonization box 12 Second carbonization box 15 Dry distillation gas transfer pipeline 20 Combustion chamber 28c Gas Mixing Chamber 28d First space (cylindrical space) 28i Lower combustion air inlet 31 Combustion burner 41 Dry distillation gas burner 44b Upper outer cylinder 44d Upper combustion air inlet 51 Gas mixing blade 51g···51j Wing part 52 Lower outer cylinder 54 Blower 57 One duct 58 The other duct

Claims

1. a carbonization box in which an organic substance-containing material to be treated is accommodated; a combustion chamber formed outside the carbonization box and having a predetermined length; a combustion burner that radiates combustion gas from the base end side of the combustion chamber in the length direction of the combustion chamber; a pyrolysis gas burner arranged in the vicinity of the combustion burner; and a pyrolysis gas flow path having one end communicating with the carbonization box and the other end connected to the pyrolysis gas burner, An industrial furnace characterized in that the direction of radiation of the carbonization gas supplied from the tip of the carbonization gas burner is set to a direction intersecting the direction of radiation of the combustion gas from the combustion burner.

2. a gas mixing chamber is formed on the combustion burner side of the combustion chamber, the gas for combustion emitted from the combustion burner being mixed therein with the carbonization gas emitted from the carbonization gas burner; 2. An industrial furnace as described in claim 1, characterized in that the gas mixing chamber has one space into which the tip of the combustion burner is inserted and another space into which the tip of the dry distillation gas burner is inserted.

3. The carbonization gas burner connected to the carbonization gas flow path is cylindrical and is disposed facing downward, At least a portion of the dry distillation gas burner is accommodated in an outer cylinder whose lower end is located toward the gas mixing chamber, A combustion air inflow space is formed between the outer peripheral surface of the dry distillation gas burner and the inner peripheral surface of the outer cylinder, into which combustion air blown from a blower through a duct flows, and The combustion air flowing into the combustion air inlet space is supplied to the tip side of the dry distillation gas burner in a vortex state by the vortex mixing structure, 3. An industrial furnace according to claim 2, wherein the carbonization gas emitted from the carbonization gas burner and the swirling combustion air are mixed with each other.

4. the outer cylinder comprises an upper outer cylinder formed in a cylindrical shape and disposed at the upper end side of the dry distillation gas burner, and a lower outer cylinder whose upper end side is connected to the lower side of the upper outer cylinder and whose diameter is smaller than the inner diameter of the upper outer cylinder; 4. The industrial furnace according to claim 3, wherein the vortex mixing structure is provided with a combustion air inlet through which the combustion air blown from the blower through the duct flows in in an eccentric direction different from the axial direction of the upper outer cylinder body.

5. An industrial furnace according to claim 3 or 4, characterized in that a gas mixing blade for mixing the distillation gas emitted from the distillation gas burner with the combustion air is arranged further below the lower end of the distillation gas burner, inside the outer cylindrical body according to claim 3 or inside the lower outer cylindrical body according to claim 4.

6. 5. An industrial furnace according to claim 2, further comprising another vortex mixing structure that supplies combustion air from a blower through a duct into the gas mixing chamber, thereby causing the combustion gas emitted from the combustion burner and the carbonization gas emitted from the carbonization gas burner to swirl and mix the combustion gas, the carbonization gas, and the combustion air.

7. 7. The industrial furnace according to claim 6, wherein the other vortex mixing structure comprises a cylindrical space formed in the gas mixing chamber and having a length in the horizontal direction, and another combustion air inlet through which the combustion air blown from the blower through the duct flows into the cylindrical space in an eccentric direction different from the axial direction of the cylindrical space.

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