Heating furnace system

Abstract

To provide a heating furnace system allowing energy saving in a relatively simple configuration.SOLUTION: A distillation furnace 1 distillates waste. A heating furnace 2 uses distillation gas exhausted from the distillation furnace 1 as fuel gas. A liquefaction apparatus 3 condenses combustible content included the distillation gas exhausted from the distillation furnace 1. A branch duct 4 switches a direction to which the distillation gas exhausted from the distillation furnace 1 is introduced between the heating furnace 2 and the liquefaction apparatus 3. A impurity removing apparatus 5 is provided between the branch duct 4 and the heating furnace 2 to remove impurity included in the distillation gas.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a heating furnace system, and more particularly to a heating furnace system that utilizes a waste combustion device. [Background technology]

[0002] Conventionally, heating furnaces (industrial furnaces) have been widely used for heat treatment of workpieces. For example, when the workpiece is metal, heating furnaces are used for various purposes, such as removing internal stress, adjusting hardness, and improving workability. Heat sources for heating furnaces are mainly electric furnaces and combustion furnaces. While electric furnaces have been considered advantageous in recent years from the perspective of decarbonization and carbon neutrality, combustion furnaces are often used for heat treatment in large heating furnaces from the perspective of fuel costs. Therefore, even heating furnaces that use combustion furnaces as their heat source are naturally required to be able to achieve decarbonization and carbon neutrality. To meet such demands, for example, a configuration is widely known in which multiple burners are provided, each serving as a supply path for fuel gas or air and an exhaust path for exhaust, and each burner has a heat storage material in its transport path, and alternates between the supply path and the exhaust path. When functioning as the exhaust path, heat is stored in the heat storage material, and when functioning as the supply path, fuel gas or air heated using the heat of the heat storage material is sprayed from the burner (e.g., Patent Document 1, etc.).

[0003] Meanwhile, in recent years, dry distillation furnaces have been used to treat general combustible waste and plastic waste. For general combustible waste, the gas produced by dry distillation can be completely burned at high temperatures to avoid the generation of harmful substances such as dioxins. For plastic waste, the combustible matter can be condensed from the gas produced by dry distillation and reused as fuel or raw material for plastics.

[0004] The applicant of this application has noticed that the methods for processing general combustible waste and plastic waste share a common step, namely gasification by dry distillation, and has proposed a waste incineration system in which dry distillation gas is extracted from general combustible waste and burned in a combustion furnace, and oil is extracted from plastic waste and used effectively (see Patent Document 2).

[0005] The applicant of the present application has also proposed a power generation system that utilizes heat generated by the waste incineration system disclosed in Patent Document 1 (see Patent Document 3). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-180954 [Patent Document 2] Patent No. 4381613 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-342476 Summary of the Invention [Problem to be solved by the invention]

[0007] In order to achieve energy-saving operation in a heating furnace to achieve decarbonization and carbon neutrality, it is effective to raise the temperature of the fuel gas, as disclosed in Patent Document 1. However, in the conventional heating furnace disclosed in Patent Document 1, in order to raise the temperature of the fuel gas, a configuration is required that can switch between a state in which it functions as an exhaust channel that heats a heat storage material and a state in which it functions as a supply channel that heats the fuel gas using the heat of the heat storage material, and a control for periodically performing this switching. It is possible to raise the temperature of the fuel gas with a simple configuration that does not perform such a switching operation, but because it requires a separate means for heating the fuel gas, it cannot contribute to decarbonization or carbon neutrality.

[0008] On the other hand, the dry distillation gas generated by the above-mentioned waste incineration system is at a high temperature, and therefore it is desired to utilize it effectively.

[0009] The present invention has been proposed in view of the above-mentioned conventional circumstances, and has as its object to provide a heating furnace system that has a relatively simple configuration and is capable of saving energy. [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the present invention employs the following technical means. The heating furnace system of the present invention comprises a carbonization furnace, a heating furnace, an oil-producing device, a branch duct, and an impurity removal device. The carbonization furnace carbonizes waste. The heating furnace uses the carbonization gas discharged from the carbonization furnace as fuel gas. The oil-producing device condenses combustibles contained in the carbonization gas discharged from the carbonization furnace. The branch duct switches the destination of the carbonization gas discharged from the carbonization furnace between the heating furnace and the oil-producing device. The impurity removal device is disposed between the branch duct and the heating furnace and removes impurities contained in the carbonization gas.

[0011] In this heating furnace system, the carbonization gas discharged from the carbonization furnace is used as fuel gas, so there is no need to increase the temperature of the fuel gas, which makes it possible to achieve energy savings when operating the heating furnace.

[0012] In the heating furnace system described above, the impurity removal device can include a sinking section or a filtering section. The sinking section has a baffle plate, and the carbonization gas is caused to collide with the baffle plate, causing solids contained in the carbonization gas to sink. The filtering section has a packed section filled with a filtering material, and the carbonization gas is passed through the packed section to filter out solids contained in the carbonization gas. The filtering section can also be configured so that the carbonization gas passes through a packed section arranged on a punched metal.

[0013] The impurity removal device may be configured to include a first sinking section, a second sinking section disposed downstream of the first sinking section, and a filtering section disposed downstream of the second sinking section.Furthermore, the heating furnace system may be configured to include a gas transport path that introduces a portion of the dry distillation gas supplied to the heating furnace into the oil-producing device. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a heating furnace system that has a relatively simple configuration and is capable of saving energy. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a block diagram showing the configuration of a heating furnace system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a vertical cross-sectional view schematically showing the configuration of a carbonization furnace and a branch duct provided in the heating furnace system according to one embodiment of the present invention. [Figure 3] FIG. 2 is a diagram showing a schematic configuration of an oil-producing apparatus provided in a heating furnace system according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view schematically showing the configuration of a heating furnace included in a heating furnace system according to an embodiment of the present invention. [Figure 5] 1 is a vertical cross-sectional view schematically showing the configuration of a heating furnace included in a heating furnace system according to an embodiment of the present invention. [Figure 6] FIG. 2 is a vertical cross-sectional view schematically showing the configuration of a carriage portion of a heating furnace provided in the heating furnace system according to an embodiment of the present invention. [Figure 7] 7(a) and 7(b) are perspective front and plan views, respectively, showing the configuration of an impurity removal device provided in a heating furnace system according to an embodiment of the present invention. [Figure 8] 8(a) is a transparent front view showing a schematic configuration of another filtration unit of an impurity removal device provided in a heating furnace system according to an embodiment of the present invention, and FIG. 8(b) is a transparent plan view showing a schematic configuration of another filtration unit of an impurity removal device provided in a heating furnace system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Fig. 1 is a block diagram showing the configuration of a heating furnace system 10 according to this embodiment.

[0017] As shown in Figure 1, the heating furnace system 10 includes a carbonization furnace 1, a heating furnace 2, an oil-producing device 3, a branch duct 4, and an impurity removal device 5. The carbonization furnace 1 carbonizes waste. The heating furnace 2 uses the carbonization gas discharged from the carbonization furnace 1 as fuel gas to heat-treat the material stored therein. The oil-producing device 3 separates the carbonization gas into an oil component and a gas component. The branch duct 4 switches the destination of the carbonization gas discharged from the carbonization furnace 1 between the heating furnace 2 and the oil-producing device 3. The impurity removal device 5 is located between the branch duct 4 and the heating furnace 2 and removes impurities contained in the carbonization gas.

[0018] Furthermore, although not particularly limited, the heating furnace system 10 also includes a heat recovery device 6 consisting of a heat exchanger such as a hot water boiler that recovers heat from the flue gas discharged from the heating furnace 2, and a dust collector 7 that removes dust from the flue gas that has passed through the heat recovery device 6. A gas fan and a chimney (not shown) that move the flue gas are provided downstream of the dust collector 7, and the flue gas is released into the atmosphere through the chimney by the action of the gas fan.

[0019] FIG. 2 is a vertical cross-sectional view schematically illustrating the configuration of the carbonization furnace 1 and branch duct 4 provided in the heating furnace system 10 of this embodiment. As shown in FIG. 2, the carbonization furnace 1 has an inlet 11 at its top. Waste to be carbonized is fed through the inlet 11. The waste fed into the carbonization furnace 1 is general combustible waste, plastic waste, wood, or the like. The inlet 11 has an upper lid 12 that opens and closes an opening provided at the top end of the inlet 11, and a shutter 13 that opens and closes an intermediate height of the inlet 11. In this configuration, for example, a predetermined amount of waste is dropped into the inlet 11 with the shutter 13 closed and the upper lid 12 open (the state shown by the dashed line in FIG. 2). Thereafter, the upper lid 12 is closed and the shutter 13 is opened. This allows the waste to fall into the carbonization furnace 1.

[0020] The hearth 14 of the carbonization furnace 1 is made of refractory material. The side walls 15 and ceiling 16 of the carbonization furnace 1 are made of a water jacket through which a cooling heat medium such as cooling water flows, and the cooling heat medium flows through the side walls 15 and ceiling 16, as well as the shutter 13 and grate 17.

[0021] Waste dropped into the carbonization furnace 1 through the inlet 11 is received by the grate 17. Below the grate 17, a burner 18 that spews flames into the carbonization furnace 1 is disposed, and the inside of the carbonization furnace 1 is heated by the burner 18, causing the waste received by the grate 17 to be carbonized.

[0022] Oil is supplied to the burner 18 from an oil collection tank 31 (described later) by a fuel pump 32 (see FIG. 1) through an oil transport line 82, and the combustion of the oil maintains a predetermined temperature inside the carbonization furnace 1. Air required for combustion is supplied by a fan 19.

[0023] When the waste is heated to several hundred degrees (for example, 300 to 600°C) in the dry distillation furnace 1, the general combustible waste or plastic waste, which is a carbon compound, is dry distilled without generating dioxins and is thermally decomposed into volatile parts and non-volatile carbonaceous matter. The carbonaceous matter falls between the grates 17 into the furnace bottom 14. This carbonaceous matter can be used as an additional fuel.

[0024] Meanwhile, the portion volatilized by carbonization is introduced into the branch duct 4 as carbonization gas. The carbonization gas introduced into the branch duct 4 is introduced into the heating furnace 2 or the oil-producing apparatus 3. As shown in FIG. 2, the branch duct 4 is made of refractory material and has a selector valve 41 installed therein. The selector valve 41 is driven by an electric motor (not shown) and switches between a first state (shown by the solid line in FIG. 2) in which the carbonization furnace 1 and the heating furnace 2 are connected to each other, and a second state (shown by the dashed line in FIG. 2) in which the carbonization furnace 1 and the oil-producing apparatus 3 are connected to each other. That is, when the heating furnace 2 is operated, the selector valve 41 is in the first state so that the carbonization gas is directed to the heating furnace 2. When the heating furnace 2 is not operated, the selector valve 41 is in the second state so that the carbonization gas is directed to the oil-producing apparatus 3. When the waste to be dry distilled is plastic waste, the dry distillation gas can be introduced into the oil-producing apparatus 3. However, when the waste is general waste, wood, or the like, introducing the dry distillation gas into the oil-producing apparatus 3 does not allow for much oil to be separated. For this reason, in this embodiment, a switching valve (not shown) is provided between the branch duct 4 and the oil-producing apparatus 3. This switching valve switches between a state in which the branch duct 4 and the oil-producing apparatus 3 are in communication with each other and a state in which the branch duct 4 and the dry distillation furnace 1 are in communication with each other via the gas transport path 83 (see FIG. 1). When the waste is general waste, wood, or the like, the switching valve is switched to a state in which the branch duct 4 and the dry distillation furnace 1 are in communication with each other.

[0025] Although not particularly limited, in this embodiment, a water jacket is also formed on the peripheral wall of the branch duct 4, and is connected to the water jacket of the carbonization furnace 1. A cooling tower (not shown) is arranged in the circulation path of the water jacket, and the heat medium (cooling water) is cooled in the cooling tower. In addition, the heat medium that is reduced during the circulation process is replenished from outside.

[0026] FIG. 3 is a schematic diagram showing the oil-producing apparatus 3 included in the heating furnace system 10 of this embodiment. As shown in FIG. 3, the oil-producing apparatus 3 includes multiple stages (two stages in this example) of condensers 30 connected in series. The oil-producing apparatus 3 switches the number of condenser stages used depending on the concentration of the dry distillation gas. The concentration of the dry distillation gas is detected by a gas detector (not shown) that is arranged in the path for transporting the dry distillation gas between the branch duct 4 and the oil-producing apparatus 3. Although not particularly limited, in this embodiment, the condensers 30a, 30b of each stage have the same configuration, and the oil liquefied in the vertical cylindrical tanks included in each condenser is collected in the oil collection tank 31 at the bottom.

[0027] When the concentration of the pyrolysis gas flowing from the branch duct 4 into the oil-producing apparatus 3 is high, the pyrolysis gas is introduced from the branch duct 4 side into the first-stage condenser 30a and then into the second-stage condenser 30b. When the concentration of the pyrolysis gas flowing from the branch duct 4 into the oil-producing apparatus 3 is low, the pyrolysis gas is introduced only into the second-stage condenser 30b. To efficiently perform such operations, various on-off valves must be provided in the branch duct 4, but detailed explanations are omitted as they are not the essence of the present invention. Note that gas that is not converted into oil in the oil-producing apparatus 3 is introduced into the pyrolysis furnace 1 through the gas transport path 81 (see FIG. 1) and combusted.

[0028] 4 and 5 are diagrams schematically showing the heating furnace 2 provided in the heating furnace system 10 of this embodiment. FIG. 4 corresponds to a cross-sectional view, and FIG. 5 corresponds to a longitudinal cross-sectional view. Note that the internal structure is not shown in FIG. 4. FIG. 6 is a diagram schematically showing the configuration of the carriage portion of the heating furnace 2. As shown in FIGS. 4 to 6, the heating furnace 2 in this embodiment is a batch-type furnace, and heat treatment is performed by increasing the atmospheric temperature inside the heating furnace while the workpiece W to be heat treated is housed inside.

[0029] The heating furnace 2 is provided with an opening / closing door 21 that constitutes one of the side walls. The opening / closing door 21 is supported by a gatepost 27 so as to be movable in the vertical direction. The opening / closing door 21 is moved in the vertical direction by a lifting device 28 consisting of an electric motor disposed at the top of the gatepost 27. That is, when the opening / closing door 21 is to be opened, the opening / closing door 21 is lifted vertically upward by the lifting device 28. When the door 21 is to be closed, the door 21 is lowered vertically downward by the lifting device 28 until the bottom surface of the door 21 comes into contact with the cart 22 .

[0030] The other three side walls 25 and the ceiling 24 of the heating furnace 2 are fixed, but a portion of the furnace bottom 23 is placed on a carriage 22. That is, the entire surface of the carriage 22 exposed inside the heating furnace 2 is made of refractory material. Although not particularly limited, in this embodiment, the carriage 22 is equipped with a plurality of wheels 22a. The wheels 22a are arranged to fit into rails arranged on the floor surface, and the workpiece W can be carried in and out of the heating furnace 2 by moving the carriage 22 along the rails. Although not particularly limited, in this embodiment, the carriage 22 is carried in and out of the heating furnace 2 by a reduction motor 29.

[0031] As shown in FIG. 4, gas supply pipes 75 are arranged around the heating furnace 2, and fuel gas is supplied through the gas supply pipes 75 to each of the burners 71 arranged on the side wall 25 of the heating furnace 2. An ignition burner 72 is arranged facing the tip of each burner 71 on the inside of the furnace. The heating power of each burner 71 is adjusted by a control damper 76 provided for each burner 71. In this embodiment, the carbonization gas whose introduction into the heating furnace 2 is restricted by the control damper 76 is introduced into the oil-producing apparatus 3 through a gas transport path 86 (see FIGS. 1 and 4). This allows oil to be separated from the carbonization gas unused in the heating furnace 2 in the oil-producing apparatus 3. Although FIG. 4 shows only burners 71 arranged at the same height, burners are also arranged at different heights. Fuel gas is also supplied to these burners through the gas supply pipes 75. The gas supply pipes 75 are connected by a header 73, which is connected downstream of the impurity removal device 5 via an on-off valve 74. Also, the burners 71 may be configured so that oil can be supplied from the oil collection tank 31 to each burner 71 via an oil transport passage 84 by a fuel pump 33 (see FIG. 1). In this configuration, the burners 71 can function as oil-fired burners by burning the oil.

[0032] The flue gas from the heating furnace 2 is led to the heat recovery device 6 through a duct 26 arranged on the ceiling 24 of the heating furnace 2. The temperature inside the duct 26 is measured by a temperature measuring device (not shown). If the temperature of the flue gas is higher than a predetermined temperature (e.g., 800°C or higher), the flue gas is led to the carbonization furnace 1 through a gas transport path 85. To achieve this function, in this embodiment, a switching valve (not shown) is provided between the heating furnace 2 and the heat recovery device 6. The switching valve switches between a state in which the heating furnace 2 and the heat recovery device 6 are in communication with each other and a state in which the heating furnace 2 and the carbonization furnace 1 are in communication with each other through the gas transport path 85 (see FIG. 1). This prevents high-temperature gas from being released into the atmosphere from the chimney.

[0033] On the other hand, the impurity removal device 5, which is disposed between the branch duct 4 and the heating furnace 2, is equipped with a sinking section or a filtering section that removes solids contained in the carbonization gas. The sinking section has a baffle plate, and the carbonization gas collides with the baffle plate to cause the solids contained in the carbonization gas to sink. The filtering section has a packed section filled with filtering material, and the carbonization gas is passed through the packed section to filter out the solids contained in the carbonization gas.

[0034] FIG. 7(a) is a see-through front view schematically showing the impurity removal device 5 provided in the heating furnace system 10 of this embodiment. FIG. 7(b) is a see-through plan view schematically showing the impurity removal device 5 provided in the heating furnace system 10 of this embodiment. Although not particularly limited, this embodiment includes two sinking portions and one filtration unit. That is, the impurity removal device 5 includes a first sinking portion 51, a second sinking portion 52 disposed downstream of the first sinking portion 51, and a filtration unit 53 disposed downstream of the second sinking portion 52. Note that FIG. 7(b) omits the illustration of the piping connecting the first sinking portion 51, the second sinking portion 52, and the filtration unit 53.

[0035] The first sunken portion 51 blocks the path of the dry distillation gas introduced from the inlet 61 arranged above. The baffle plates 54 are arranged across the entire width direction (the vertical direction in FIG. 7(b)) in a state where the baffle plates 54 are arranged across the entire width direction (the vertical direction in FIG. 7(b)) so as to block the shortest path that the carbonization gas introduced from the inlet 61 takes toward the outlet 62 arranged at the top of the side wall. As a result, the carbonization gas that collides with the baffle plates 54 travels inside the first sunken portion 51 toward the outlet 62 while further colliding with the inner wall surface of the first sunken portion 51. As a result, the flow velocity of the carbonization gas decreases, and solids contained in the carbonization gas sink as it travels.

[0036] In the second sinking portion 52, baffles 55 are arranged across the entire width direction (vertical direction in FIG. 7(b)) in a state where they block the shortest path that the pyrolysis gas introduced from the inlet 63 arranged in the upper wall takes toward the discharge outlet 64 arranged in the upper part of the side wall. As a result, the pyrolysis gas that collides with the baffles 55 travels slowly inside the second sinking portion 52 toward the discharge outlet 64. As a result, solids contained in the pyrolysis gas sink during the traveling process.

[0037] The filtration section 53 includes a packing section 57 filled with a filter material along a path along which the pyrolysis gas introduced from an inlet 65 located at the top of the side wall travels toward an outlet 66 located at the top of the opposing side wall. The filtration section 53 of this embodiment also includes a permeable wall 56 and a partition wall 58. In this embodiment, the permeable wall 56 is made of punched metal and is disposed horizontally across the entirety at a predetermined height below the inlet 65 and the outlet 66. The partition wall 58 is disposed across the entire width direction parallel to the side wall including the inlet 65, dividing the space above the permeable wall 56 into two. The packing section 57 is made of a filter material disposed in layers on the permeable wall 56. The pyrolysis gas introduced from the inlet 65 is directed downward by the partition wall 58, passes through the packing section 57 and the permeable wall 56, and is introduced into the space below the permeable wall 56. The permeable wall 56 and the packing section 57 then pass through the outlet 66-side permeable wall 56 and the outlet 66-side packing section 57 to reach the outlet 66. As the dry distillation gas passes through the packed section 57, it collides with the filter material, and the solid matter contained in the dry distillation gas is either adsorbed onto the filter material or falls. The fallen solid matter falls to the bottom of the filtering section 53 through the openings in the perforated metal 56.

[0038] Ceramic materials such as silica, alumina, zirconia, cordierite, and silicon carbide can be used as the filter material. If necessary, the filter material can be loaded with a catalyst such as platinum, palladium, rhodium, vanadium, molybdenum, or zeolite, or a catalyst layer can be placed between layers of filter material. In this embodiment, high-alumina balls are used as the filter material. The shape of the filter material is not limited to a spherical shape; any shape, such as a rectangular parallelepiped, tetrahedron, or other polyhedral shape, granular, pellet-like, or flat, can be used. These surfaces may also have regular or irregular protrusions. A mixture of filter materials of various shapes and sizes may also be used. It is particularly preferable that the direction of travel of the dry distillation gas impinging on the filter material be dispersed in various directions within the packed section 57.

[0039] Although not particularly limited, in this embodiment, the packed section 57 is composed of three packed layers 57a, 57b, and 57c, each composed of high-alumina balls of different particle sizes. The particle size of the high-alumina balls constituting the lowest packed layer 57c is smaller than that of the high-alumina balls constituting the upper packed layer 57b. The particle size of the high-alumina balls constituting packed layer 57b is also smaller than that of the high-alumina balls constituting the upper packed layer 57a. By adopting such a configuration, the flow rate of the pyrolysis gas introduced into the space below the permeable wall 56 can be further reduced, and the passage resistance when the pyrolysis gas advances from the lower space toward the discharge port 66 can be increased, thereby lengthening the residence time of the pyrolysis gas in the lower space. As a result, it is possible to further reduce the solids contained in the pyrolysis gas.

[0040] The configuration of the filtering section 53 may be the same as that shown in Fig. 8. Fig. 8(a) is a perspective front view showing a schematic view of another filtering section 93 of the impurity removal device 5 provided in the heating furnace system 10 of this embodiment. Fig. 8(b) is a perspective front view showing another filtering section 93 of the impurity removal device 5 provided in the heating furnace system 10 of this embodiment. 8(b) is a transparent plan view schematically showing another filtration section 93 of the impurity removal device 5. Note that in FIG. 8(b), the illustration of the piping connected to the filtration section 93 is omitted.

[0041] The filtration section 93 is provided with a packed section 97 filled with filtering material in a portion of the path along which the carbonization gas introduced from the inlet 65 located at the top of the side wall heads toward the outlet 66 located at the top of the opposing side wall. The packed section 97 is a rectangular parallelepiped space provided across the entire width direction intersecting the direction of travel of the carbonization gas, and the bottom of the space is formed by a perforated metal 96. As a result, the carbonization gas collides with the filtering material while passing through the packed section 97, and solids contained in the carbonization gas are adsorbed onto or fall onto the filtering material. The fallen solids fall to the bottom of the filtration section 93 through the openings in the perforated metal 96.

[0042] Although not particularly limited, in this embodiment, the packed section 97 is composed of three packed layers 97a, 97b, and 97c, each composed of high-alumina balls of different particle sizes. The particle size of the high-alumina balls constituting the bottommost packed layer 97a is larger than the particle size of the high-alumina balls constituting the packed layer 97b above it. The particle size of the high-alumina balls constituting packed layer 97b is also larger than the particle size of the high-alumina balls constituting the packed layer 97c above it. The packed layers 97a, 97b, and 97c are separated from each other by, for example, punched metal.

[0043] By adopting such a configuration, the resistance to the passage of the pyrolysis gas through the upper packed layer 97c of the packed bed 97 is greater than the resistance to the passage of the pyrolysis gas through the lower packed layer 97a. Therefore, the pyrolysis gas introduced from the inlet 65 can be guided toward the lower layers of the packed bed 97, and the residence time of the pyrolysis gas can be extended. As a result, it becomes possible to allow more solids contained in the pyrolysis gas to fall.

[0044] The dry distillation gas that has passed through the impurity removal device 5 as described above is supplied to the gas supply pipe 75 through the header 73. Since the dry distillation gas that has passed through the impurity removal device 5 contains only a small amount of impurities, the dry distillation gas can be used for heat treatment in the heating furnace 2 without any problems.

[0045] As described above, in the heating furnace system 10, the carbonization gas discharged from the carbonization furnace 1 is used as fuel gas, eliminating the need to heat the fuel gas and enabling energy savings during operation of the heating furnace 2. Furthermore, because the carbonization furnace 1 can operate 24 hours a day, oil separation can continue in the oilification device 3 even when the heating furnace 2 is out of operation. As a result, further energy savings can be achieved by using the separated oil as fuel.

[0046] The above-described embodiments do not limit the technical scope of the present invention, and various modifications and applications other than those already described are possible within the scope of the present invention. For example, in the above-described embodiments, the heating furnace is of a batch type, but the heating furnace may also be a continuous furnace. Furthermore, in the above-described embodiments, a heat recovery device 6 is disposed downstream of the heating furnace 2 as a particularly preferred embodiment, but the heat recovery device 6 is not an essential component of the present invention.

[0047] Furthermore, in the above-described embodiment, a configuration including two sinking sections and one filtering section was exemplified as the impurity removal device 5, but the number and arrangement order of the sinking sections or filtering sections are not limited to this configuration. [Industrial Applicability]

[0048] According to the present invention, energy saving can be achieved with a relatively simple configuration, and it is useful as a heating furnace system. [Explanation of symbols]

[0049] 1. Dry distillation furnace 2 Furnace 3 Oil conversion equipment 4 Branch duct 5 Impurity removal equipment 10. Furnace System 51 First subsidence 52 Second subsidence 53 Filtration section 54, 55 Baffle board 56 Punching metal 57 Filling section 81, 83, 85, 86 Gas transport routes 82, 84 Oil transport route

Claims

1. a carbonization furnace for carbonizing the waste; a heating furnace that uses the carbonization gas discharged from the carbonization furnace as fuel gas; an oil-reducing device that condenses combustible matter contained in the dry distillation gas discharged from the dry distillation furnace; a branch duct for switching the destination of the dry distillation gas discharged from the dry distillation furnace between the heating furnace and the oil-producing apparatus; an impurity removal device disposed between the branch duct and the heating furnace, for removing impurities contained in the dry distillation gas; A heating furnace system comprising:

2. 2. The heating furnace system of claim 1, wherein the impurity removal device comprises a sinking section having a baffle plate and causing the distillation gas to collide with the baffle plate to sink solids contained in the distillation gas, or a filtering section having a filling section filled with a filtering material and causing the distillation gas to pass through the filling section to filter out solids contained in the distillation gas.

3. 3. The heating furnace system according to claim 2, wherein the impurity removal device comprises a first sinking section, a second sinking section disposed downstream of the first sinking section, and a filtering section disposed downstream of the second sinking section.

4. The heating furnace system according to claim 2 , wherein the carbonization gas passes through the packed section disposed on a perforated metal.

5. The heating furnace system according to claim 1 , further comprising a gas transport line for introducing a portion of the dry distillation gas supplied to the heating furnace into the oil-producing apparatus.

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