Pyrolysis system

Abstract

To provide a pyrolysis system capable of removing tar and carbon from pyrolysis gas without separately providing a scrubber device, and further capable of effectively utilizing energy.SOLUTION: A pyrolysis system 10 comprises: a pyrolysis furnace 1 that generates pyrolysis gas containing tar and carbon by pyrolysis of a raw material; and a reformer 2 that generates fuel gas containing at least one of hydrogen and carbon monoxide by reforming the pyrolysis gas generated by the pyrolysis furnace 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pyrolysis system, and more particularly to a pyrolysis system that can effectively utilize pyrolysis gas generated by pyrolysis of a raw material. [Background technology]

[0002] BACKGROUND ART Pyrolysis furnaces have been known in which heat is applied to raw materials such as waste while restricting the air flow, thereby causing a pyrolysis reaction and carbonizing the waste (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-114097 Summary of the Invention [Problem to be solved by the invention]

[0004] The gas generated in the pyrolysis furnace (sometimes referred to as pyrolysis gas) is discharged from the pyrolysis furnace. If the gas does not remain in the pyrolysis furnace for a sufficient period of time, tar and carbon containing long-chain hydrocarbons and aromatic compounds will remain in the pyrolysis gas.

[0005] For this reason, in the past, when a pyrolysis furnace was used, it was necessary to separately provide a scrubber device for removing tar and carbon from the pyrolysis gas.

[0006] However, when a separate scrubber device for removing tar and carbon is provided, the tar and carbon accumulate in the scrubber device, resulting in a problem of increased frequency of maintenance.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide a pyrolysis system that can remove tar and carbon from pyrolysis gas without the need for a separate scrubber device, and that can make effective use of energy. [Means for solving the problem]

[0008] A pyrolysis system according to one embodiment of the present invention includes a pyrolysis furnace that generates pyrolysis gas containing tar and carbon by pyrolysis of a raw material, and a reformer that generates fuel gas containing at least one of hydrogen and carbon monoxide by reforming the pyrolysis gas generated by the pyrolysis furnace. [Effects of the Invention]

[0009] The pyrolysis system according to the above aspect of the present invention has the advantage that it can remove tar and carbon from pyrolysis gas without providing a separate scrubber device, and also that it can make effective use of energy. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram of a pyrolysis system according to an embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of a pyrolysis furnace of the pyrolysis system according to the embodiment. [Figure 3] FIG. 2 is a schematic cross-sectional view of a reformer of the thermal decomposition system according to the embodiment. [Figure 4] FIG. 1 is a schematic diagram of a test device for Test 1. DETAILED DESCRIPTION OF THE INVENTION

[0011] <Embodiment> (overview) As shown in FIG. 1, a pyrolysis system 10 according to this embodiment includes a pyrolysis furnace 1 into which a raw material is fed, a reformer 2, and a generator 3. The pyrolysis furnace 1 generates pyrolysis gas containing tar and carbon by pyrolysis of the raw material. The reformer 2 generates fuel gas by reforming the pyrolysis gas generated by the pyrolysis furnace 1. The generator 3 can generate electricity using the fuel gas generated by the reformer 2.

[0012] According to the pyrolysis system 10 of this embodiment, pyrolysis gas produced by pyrolysis of a feedstock is reformed by the reformer 2 to produce fuel gas for driving the generator 3. Therefore, according to the pyrolysis system 10 of this embodiment, tar and carbon can be removed from the pyrolysis gas without the need for a separate scrubber device. Moreover, according to the pyrolysis system 10 of this embodiment, since fuel gas can be produced from the pyrolysis gas, not only can the volume of the feedstock be reduced, but power can also be generated, enabling effective use of energy.

[0013] Furthermore, in the pyrolysis system 10 according to this embodiment, the catalyst contained in the reformer 2 is heated, thereby reforming and sterilizing the pyrolysis gas. Therefore, even if infectious waste is used as a raw material, the infectious waste is decomposed without retaining microorganisms and the like derived from the infectious waste. Therefore, the infectious waste can be reduced in volume and disposed of, while generating electricity using the generated fuel gas. Here, in this specification, "sterilization" means that the sterility assurance level (SAL) is 10 or less. -6 This means that

[0014] Each element constituting the pyrolysis system 10 according to this embodiment will be described in more detail below.

[0015] (pyrolysis furnace 1) The pyrolysis furnace 1 generates pyrolysis gas containing tar and carbon by pyrolyzing a raw material. As shown in FIG. 2, the pyrolysis furnace 1 according to this embodiment includes an input section 11, a furnace body 12, an exhaust path 17, and an exhaust section 18. The raw material is input from the input section 11 into the furnace body 12 and pyrolyzed in the furnace body 12. The pyrolyzed raw material is decomposed into pyrolysis gas and char.

[0016] The pyrolysis furnace 1 is preferably a fixed-bed updraft type pyrolysis furnace. As shown in FIG. 2, the pyrolysis furnace 1 according to this embodiment is a fixed-bed updraft type pyrolysis furnace. As a fixed-bed updraft type pyrolysis furnace, a relatively large amount of tar can be contained in the pyrolysis gas compared to a fixed-bed downdraft type pyrolysis furnace, which is expected to improve the fuel gas production efficiency and makes it easier to control the pyrolysis reaction of the raw material. However, the pyrolysis furnace 1 is not limited to a fixed-bed updraft type pyrolysis furnace, and for example, a fixed-bed downdraft type, rotary kiln type, fluidized bed type, etc. may also be used.

[0017] The raw material may be any organic material that produces pyrolysis gas containing tar and carbon upon pyrolysis, such as wood, waste plastics, chemical products, infectious waste such as medical waste, etc.

[0018] Pyrolysis gas is a gas obtained by pyrolyzing a raw material. Pyrolysis gas contains at least tar and carbon. Tar includes long-chain hydrocarbons or aromatic compounds. Pyrolysis gas may contain other components in addition to tar and carbon. Examples of components contained in pyrolysis gas other than tar and carbon include H2, CO, N2, O2, CO2, CH4, lower hydrocarbons, trace amounts of sulfur oxides, nitrogen oxides, etc. Furthermore, when infectious waste is used as the raw material, the pyrolysis gas may contain microorganisms in addition to tar and carbon.

[0019] The charging section 11 is a section where raw materials are charged. The charging section 11 is provided at the upper end of the furnace body 12. The charging section 11 comprises a box 111 having an opening on one of its outer surfaces and on the surface facing the inside of the furnace body 12, a door 112 that opens and closes the opening on the outer surface, and a plurality of support plates 113 that open and close the opening on the surface facing the inside of the furnace body 12. When the door 112 is opened, the raw materials can be accommodated in the box 111. When the raw materials are placed into the box 111 through the opening on the outer surface of the box 111, the raw materials are supported by the support plates 113. When the support plates 113 are opened, the raw materials supported by the support plates 113 are charged into the furnace body 12.

[0020] The furnace body 12 is a furnace that is long in the vertical direction and constitutes the main body of the pyrolysis furnace 1. The furnace body 12 is formed in a cylindrical shape (for example, a cylindrical, rectangular, or pentagonal cylindrical shape). The internal space of the furnace body 12 includes multiple partial combustion zones 121, 122 and an upper zone 123 that delivers pyrolysis gas emitted from the partial combustion zones 121, 122 to the exhaust path 17. The furnace body 12 has, from bottom to top, multiple partial combustion zones, namely, a first partial combustion zone 121 and a second partial combustion zone 122.

[0021] The first partial combustion zone 121 is a zone partitioned by the first plate 15 and the second plate 16. Both the first plate 15 and the second plate 16 are attached to the inner surface of the furnace body 12 so as to be switchable between a "closed position" perpendicular to the central axis of the furnace body 12 and an "open position" along the inner surface of the furnace body 12. In the initial stage of charging raw materials into the furnace body 12, the second plate 16 is switched to the open position and the first plate 15 is switched to the closed position, so that the raw materials are stored in the first partial combustion zone 121. Once a certain amount of raw materials has been stored in the first partial combustion zone 121, the second plate 16 is switched to the closed position, and the raw materials are stored in the second partial combustion zone 122.

[0022] The first plate 15 and the second plate 16 have multiple pipes P1 that connect the space below and the space above the corresponding plates 15, 16. As a result, even when the first plate 15 is in the closed position, the combustion gas below the first plate 15 flows into the first partial combustion zone 121 through the pipes P1 of the first plate 15. Also, even when the second plate 16 is in the closed position, the combustion gas generated in the first partial combustion zone 121 flows into the second partial combustion zone 122 through the pipes P1 of the second plate 16. This allows a space to be provided midway in the vertical direction of the furnace body 12, facilitating the thermal decomposition of the raw material.

[0023] A plurality of heating sections 19 are provided on the inner surface of the furnace body 12. The furnace body 12 according to this embodiment includes, as the plurality of heating sections 19, a first heating section 191 provided on the inner surface of the furnace body 12 at a position below the first plate 15 in the closed position, a second heating section 192 provided on the inner surface of the furnace body 12 in the first partial combustion zone 121, and a third heating section 193 provided on the inner surface of the furnace body 12 in the second partial combustion zone 122.

[0024] Each heating section 19 preferably has an outlet that can switch between supplying hot air and air. A hot air duct that supplies high-temperature gas and an air duct that supplies air are connected to the outlet. The switching between high-temperature gas and air is performed depending on the temperature of the raw material. Examples of the gas supplied to the hot air duct include the combustion gas G1 used in the reformer 2 and combustion gas generated by a burner separate from the reformer 2. The air supplied to the air duct is, for example, outside air, and has a lower temperature than the gas flowing through the hot air duct. This allows partial combustion to occur in the raw material input into each partial combustion region 121, 122, and generates pyrolysis gas.

[0025] It is preferable that multi-pipes 13, 14 are provided in each of the first partial combustion zone 121 and the second partial combustion zone 122. Hereinafter, the multi-pipe provided in the first partial combustion zone 121 will be referred to as the "first multi-pipe 13," and the multi-pipe provided in the second partial combustion zone 122 will be referred to as the "second multi-pipe 14."

[0026] The first multi-pipe 13 includes a rotation shaft 131 that extends along a horizontal plane and the inner surface of the furnace body 12, and multiple levers 132 that protrude in the diameter direction from the rotation shaft 131. The multiple levers 132 are arranged at regular intervals along the rotation shaft 131. The multiple levers 132 rotate around the rotation shaft 131, thereby pushing downward the raw material that has been introduced into the first partial combustion zone 121. This can accelerate the progress of volume reduction of the raw material through pyrolysis.

[0027] It is also preferable that the first multi-pipe 13 is provided with a detector that detects the presence or absence of raw material. The detector may be, for example, a contact sensor or a non-contact sensor. By providing the detector in the first multi-pipe 13, the height position of the raw material in the first partial combustion area 121 can be detected based on the rotation angle of the lever 132 when the first multi-pipe 13 comes into contact with the raw material, and the amount of raw material in the first partial combustion area 121 can be determined.

[0028] The second multi-pipe 14 has the same structure as the first multi-pipe 13, and includes a rotating shaft 141 and multiple levers 142. The second multi-pipe 14 can push the raw material fed into the second partial combustion area 122 downward. Similarly to the first multi-pipe 13, the second multi-pipe 14 is preferably provided with a detection unit, which makes it possible to grasp the amount of raw material in the second partial combustion area 122.

[0029] The exhaust path 17 communicates with the interior of the furnace body 12, and in this embodiment, communicates with the upper region 123. The pyrolysis gas generated in the furnace body 12 is sent to the reformer 2 through the exhaust path 17. The exhaust path 17 is preferably located above the second partial combustion region 122. This allows the pyrolysis gas in the furnace body 12 to be sent to the reformer 2 efficiently.

[0030] The discharge section 18 is a section that discharges charcoal generated by pyrolysis to the outside of the furnace body 12. The discharge section 18 includes a plurality of bottom plates 181 that can open and close the bottom opening surface of the furnace body 12, and a cooling section 182 that receives and cools the charcoal discharged through the bottom opening surface of the furnace body 12. The cooling section 182 has an openable and closable door. When discharging charcoal from the furnace body 12, the high-temperature charcoal can be cooled by the cooling section 182, and the cooled charcoal can be discharged to the outside. The cooling section 182 may cool the charcoal by heat exchange with outside air, or may cool the charcoal by heat exchange with a refrigerant.

[0031] (Reformer 2) The reformer 2 can generate fuel gas containing at least one of hydrogen and carbon monoxide by reforming the pyrolysis gas. As shown in Fig. 3, the reformer 2 includes an inlet 21 communicating with the exhaust passage 17, an outlet 22 for discharging the reformed fuel gas, a flow path 23 connecting the inlet 21 and the outlet 22, and a housing 27. A catalyst housing tank 24 is provided in the flow path 23. The catalyst housing tank 24 houses a catalyst 25 that reforms the pyrolysis gas. The reformer 2 also includes a plurality of heating devices 26 that heat the catalyst 25 in the catalyst housing tank 24.

[0032] The catalyst 25 reforms the pyrolysis gas into fuel gas. The fuel gas after reforming by the catalyst 25 contains at least one of hydrogen and carbon monoxide. The reaction formula for producing fuel gas by the reforming reaction of the pyrolysis gas with steam is, for example, CH4+H2O→CO+3H2 CH4+CO2→2CO+2H2 CO+H2O→H2+CO2 C+CO2→2CO C+H2O→CO+H2 It should be noted that instead of methane, long-chain hydrocarbons or aromatic hydrocarbons may be used.

[0033] A Ni-based catalyst is preferred as the catalyst 25. An example of the catalyst 25 is a composite oxide (NAZO) formed by combining NiAl2O4, γ-Al2O3, and ZrO2 (hereinafter, may be referred to as composite oxide (NAZO)).

[0034] The composite oxide (NAZO) is a composite oxide formed by further compounding NAO (a composite oxide of NiAl2O4 and γ-Al2O3) with ZrO2. The addition of ZrO2 improves the material strength of NAO. ZrO2 has multiple crystal systems, including monoclinic, tetragonal, and cubic. When stress is applied to NAZO, the crystal system changes, allowing stress relaxation, which is thought to improve the material strength compared to NAO. Furthermore, because the cubic crystal system is stable at high temperatures, it is thought to contribute to improved strength in ways other than the phase change. The composite oxide becomes an active material through reduction and can be used as a catalyst for the reformer 2. After the active material is deactivated by applying heat, it can be regenerated into an active material by sequentially performing oxidation and reduction treatments on the deactivated material.

[0035] The form of the composite of NiAl2O4, γ-Al2O3, and ZrO2 in the composite oxide (NAZO) is not limited, and examples include a form in which each oxide particle is completely dissolved, and a form in which parts of the surfaces of each oxide particle are dissolved together and necked to form a composite.

[0036] The molar composition ratio of Ni, Al, and Zr in the composite oxide (NAZO) can be adjusted by adjusting the blending ratio of the raw materials used to prepare the composite oxide. When the molar composition ratio of each element is expressed as the ratio of the raw materials blended, Ni:Al:Zr is preferably 1 or more:1-40:0-40, and more preferably 1-2:10-40:1-10. To improve the material strength of NAZO compared to NAO, a ZrO content of 1% by mass or more can enhance the material strength, assuming that the total amount of the oxides (NiAl2O4, γ-Al2O3, and ZrO2) constituting the composite oxide (NAZO) is 100% by mass. The ZrO2 content is preferably 5% by mass or more, more preferably 10% by mass or more. The preferred upper limit, determined from the relationship between strength improvement and the properties of the composite oxide (the properties of the active material after reduction), is approximately 90% by mass.

[0037] The method for preparing the composite oxide (NAZO) is not limited, and for example, the raw materials nickel salt, aluminum salt, and zirconium salt are dissolved in ion-exchanged water to prepare respective aqueous solutions, and a mixture of predetermined amounts of each aqueous solution is titrated with an alkali source such as sodium hydroxide or aqueous ammonia to obtain a precipitate by coprecipitation, which is then dried and calcined in the air to obtain the composite oxide (NAZO). The method for preparing a composite oxide by coprecipitation to obtain, for example, a hydroxide precipitate, which is dried and calcined in the air is a technique known to those skilled in the art, and the conditions for obtaining the precipitate and the drying and calcination conditions may be those of ordinary skill in the art.

[0038] As the raw materials for nickel salts, aluminum salts, and zirconium salts, for example, sulfates, nitrates, etc. of the respective elements can be used. Furthermore, when NAZO contains an oxide of a platinum group element M1 (e.g., Ru) and a metal element M2 (at least one selected from the group consisting of Ti, Hf, Ce, Sc, Y, La, Sm, Ca, Mg, Sr, and Ba), a composite can be formed by co-precipitating an aqueous solution of a salt (e.g., nitrate, sulfate, or chloride) of the platinum group element M1 or the metal element M2 with an aqueous solution of a nickel salt, an aluminum salt, or a zirconium salt. When NAZO contains a platinum group element M1 (e.g., Ru), for example, Ru easily alloys with Ni to form Ni-Ru in the active material (reduced state) of the present invention described below. This has the advantages of improving reforming activity, improving carbon deposition resistance during reforming, and allowing lower oxidation and reduction temperatures to be set when sequentially performing oxidation and reduction treatments on the deactivated material in the method for regenerating the active material of the present invention described below. Furthermore, the metal element M2 can be easily alloyed with Ni to form Ni-Ru in the active material (reduced state) of the present invention described below. x ) (where x represents the amount of oxygen corresponding to the metal element M2) to form a composite oxide, which does not have activity itself but has the effect of further increasing the dispersibility of the platinum group element M1.

[0039] Because the resulting composite oxide (NAZO) has improved material strength compared to NAO, the composite oxide (NAZO) can be directly formed into the desired shape, for example, by tumbling granulation. Alternatively, the composite oxide (NAZO) can be supported on a known support such as α-AlO to form the desired shape. To support NAZO on α-AlO (support), for example, α-AlO is tumbling granulated with water (binder) to obtain primary granules (support precursor), and the desired amount of the precipitate (after drying) is added to the primary granules and further tumbling granulated to obtain secondary granules (support precursor). The secondary granules can be calcined to obtain a support with NAZO supported on the support surface. Tumbling granulation is a technique known to those skilled in the art, and the conditions for obtaining NAZO granules and a support with NAZO supported on a support can be conventional.

[0040] The heating device 26 heats the catalyst 25. The heating device 26 according to this embodiment includes a first burner 261 and a second burner 262.

[0041] The first burner 261 is attached to the housing 27 of the reformer 2 and heats the catalyst housing tank 24 by moving the combustion gas G1 so that it contacts the catalyst housing tank 24, and then heats the catalyst 25 via the heated catalyst housing tank 24. The catalyst 25 is preferably heated by the first burner 261 to 750°C or higher, more preferably 800°C or higher, and even more preferably 850°C or higher. This promotes the reforming reaction of the pyrolysis gas containing carbon and tar. Furthermore, if the raw material is infectious waste, the pyrolysis gas contains microorganisms, but by heating the catalyst 25 to 750°C or higher, the pyrolysis gas that comes into contact with the catalyst 25 can be sterilized.

[0042] The second burner 262 heats the flow path 23 at the time of startup. By using the second burner 262, if the temperature of the reformer 2 is low at the time of startup, it is possible to transition more quickly to an operable state.

[0043] The fuel gas generated by the reformer 2 exits the reformer 2 through the outlet 22 and is stored in the gas holder GH. A portion of the fuel gas stored in the gas holder GH is supplied to the generator 3, which will be described later, and the other portion is supplied to a supply port 29 that opens into the reformer 2. The supply port 29 opens toward the first burner 261. The amount of heat generated by the first burner 261 can be controlled by controlling the amount of gas supplied from the supply port 29. In this way, by reusing the combustion gas obtained by reforming the pyrolysis gas from the pyrolysis furnace 1, it is possible to save commercially available gas (e.g., LP gas) that is the fuel for the first burner 261. It is preferable to provide a filter in the flow path connecting the outlet 22 and the gas holder GH.

[0044] The combustion gas G1 in the housing 27 exchanges heat with the catalyst 25, and then is discharged to the outside of the housing 27 through an outlet 28 for the combustion gas G1. The combustion gas G1 discharged from the outlet 28 is preferably supplied to, for example, the first heating section 191, the second heating section 192, and the third heating section 193 of the pyrolysis furnace 1 through an exhaust path.

[0045] (Generator 3) The generator 3 generates electricity using the fuel gas produced by the reformer 2. The generator 3 may be, for example, a generator that generates electricity by driving a heat engine such as a gas turbine engine or a rotary engine, or may be a fuel cell.

[0046] Preferably, the generator 3 generates thermal energy in addition to electrical energy. Examples of thermal energy generated by the generator 3 include exhaust gas and exhaust heat generated during operation. By obtaining electrical energy and thermal energy from the generator 3, the pyrolysis system 10 according to this embodiment can effectively utilize energy.

[0047] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0048] The pyrolysis furnace 1 in the above embodiment is a partial combustion type pyrolysis furnace 1 that performs pyrolysis by partial combustion, but the pyrolysis furnace 1 is not limited to the partial combustion type as long as it is a pyrolysis furnace 1 that can perform pyrolysis (sometimes called a ``self-thermal pyrolysis furnace'').

[0049] In the reformer 2 according to the above embodiment, the catalyst 25 is heated indirectly by heating the catalyst storage tank 24 with the combustion gas G1, but the catalyst 25 may also be heated directly with the combustion gas G1, or indirectly by heating the pyrolysis gas, for example.

[0050] The pyrolysis system 10 according to the above embodiment includes the pyrolysis furnace 1, the reformer 2, and the generator 3. However, for example, it is also possible to use an existing generator 3 and install a new pyrolysis furnace 1 and reformer 2. In this case, the outlet 22 of the reformer 2 can be connected to the fuel supply port of the generator 3 using piping such as a pipe or a tube.

[0051] <Action and effect> As described above, the pyrolysis system 10 according to the first embodiment includes a pyrolysis furnace 1 that generates pyrolysis gas containing tar and carbon by pyrolysis of a raw material, and a reformer 2 that generates fuel gas containing at least one of hydrogen and carbon monoxide by reforming the pyrolysis gas generated by the pyrolysis furnace 1.

[0052] According to this embodiment, the pyrolysis gas produced by pyrolysis of the feedstock is reformed by the reformer 2 to produce fuel gas for driving the generator 3. Therefore, the pyrolysis system 10 according to this embodiment can remove tar and carbon from the pyrolysis gas without the need for a separate scrubber device. Moreover, since the pyrolysis system 10 can produce fuel gas from the pyrolysis gas, it is possible not only to reduce the volume of the feedstock but also to generate electricity, thereby enabling effective use of energy.

[0053] The pyrolysis system 10 according to the second embodiment is the same as the pyrolysis system 10 according to the first embodiment, but further includes a generator 3 that generates electricity using the fuel gas produced by the reformer 2. The pyrolysis system 10 according to this embodiment can not only reduce the volume of the raw material but also generate electricity, thereby enabling effective use of energy.

[0054] In the pyrolysis system 10 according to the third aspect, in the first or second aspect, the pyrolysis furnace 1 is configured to pyrolyze infectious waste as a raw material to generate pyrolysis gas containing microorganisms. The reformer 2 has a catalyst 25. The reformer 2 is configured to heat the catalyst 25 to reform and sterilize the pyrolysis gas. According to this aspect, even if infectious waste is used as a raw material, it can be reduced in volume and disposed of, while generating electricity using the generated fuel gas, enabling even more effective use of energy.

[0055] In the pyrolysis system 10 according to the fourth aspect, the reformer 2 in the third aspect has a heating device 26 that heats the catalyst 25 to 750°C or higher. According to this aspect, sterilized fuel gas can be produced, thereby preventing the leakage of bacteria such as microorganisms.

[0056] <Test 1> We verified whether tar can be decomposed by reforming pyrolysis gas containing tar using a catalyst.

[0057] The test equipment used was the one shown in Figure 4. Pyrolysis gas obtained by pyrolyzing RPF (Refuse-derived paper and plastics densified fuel) was used as a sample, and the pyrolysis gas and air were supplied into a quartz tube heated to 850°C. The air flow rate was 180 ml / min, and the pyrolysis gas flow rate was 6 g / h. A filter was installed at the outlet of the quartz tube, and the amount of tar captured by the filter was measured.

[0058] The amount of tar was measured with and without a catalyst in the quartz tube. 26.7 g of 13NAO product was used as the catalyst.

[0059] The results are shown in Table 1 below.

[0060] [Table 1]

[0061] As can be seen from Table 1, without a catalyst, ethylene tar (C2H4) was contained in the pyrolysis gas even in an environment of 850°C, whereas with a catalyst, no ethylene tar was measured. This confirmed that tar was decomposed in an environment with a catalyst.

[0062] <Test 2> We verified whether it was possible to sterilize the microorganisms contained in the pyrolysis gas when infectious waste was used as the raw material.

[0063] The apparatus shown in Figure 4 was used, and the sample was a suspension of Geobacillus stearothermophilus ATCC 7953 spores in sterile water. The spore suspension containing 107 CFU was atomized using a mesh-type ultrasonic nebulizer and supplied to a quartz tube filled with a catalyst (13NAO + 3ZrO2). Tests were conducted with the quartz tube heated to 50°C and 750°C. The air flow rate was set to 2500 mL / min, and a trap containing 20 mL of sterile water was placed at the outlet of the quartz tube to collect the passing bacterial spores (referred to as the collected liquid). A similar test was also conducted with the tube heated to 25°C without the catalyst.

[0064] The recovered solution was diluted 10-fold, 100-fold, and 1000-fold with sterile water, and 1 mL of the undiluted recovered solution and each diluted solution was added to a standard agar medium and cultured at 55°C for 48 hours. The number of colonies that grew after culture was counted to determine the number of viable bacteria contained in the recovered solution.

[0065] The results are shown in Table 2 below.

[0066] [Table 2]

[0067] As can be seen from Table 2, when heated to 750°C, no live bacteria were detected and the waste was sterilized, confirming that sterilization is possible. Therefore, when infectious waste is used as a raw material, even if it contains microorganisms or other bacteria, sterilized fuel gas can be obtained by reforming it using a catalyst heated to 750°C, so it has been confirmed that there is no risk of microorganisms or other bacteria leaking to the outside. [Explanation of symbols]

[0068] 10. Pyrolysis System 1 Pyrolysis furnace 2 Reformer 25 Catalyst 26 Heating device 3. Generator

Claims

1. a pyrolysis furnace for generating pyrolysis gas containing tar and carbon by pyrolysis of a raw material; a reformer that reforms the pyrolysis gas generated by the pyrolysis furnace to generate a fuel gas containing at least one of hydrogen and carbon monoxide; A pyrolysis system comprising:

2. further comprising a generator that generates electricity using the fuel gas produced by the reformer. The pyrolysis system of claim 1 .

3. the pyrolysis furnace is configured to pyrolyze infectious waste as the raw material to generate the pyrolysis gas containing microorganisms; the reformer has a catalyst; The reformer is configured to heat the catalyst to reform and sterilize the pyrolysis gas. The pyrolysis system according to claim 1 or claim 2.

4. The reformer has a heating device that heats the catalyst to 750°C or higher. The pyrolysis system of claim 3 .

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