Fuel synthesis system and fuel synthesis method

Abstract

To provide a fuel synthesis system capable of synthesizing a hydrocarbon fuel with high efficiency using pyrolysis gas generated from biomass.SOLUTION: In a fuel synthesis system of the present disclosure, the ratio of hydrogen to carbon monoxide contained in pyrolysis gas generated by pyrolysis of biomass is adjusted by a ratio adjustment unit. By performing a methane synthesis reaction using the pyrolysis gas with the adjusted ratio, the hydrocarbon fuel can be efficiently synthesized.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a fuel synthesis system and a fuel synthesis method. [Background technology]

[0002] Biomass has been attracting attention as a new resource for synthesizing hydrocarbon fuels. For example, Patent Documents 1 and 2 disclose techniques for synthesizing hydrocarbon fuels using this type of biomass. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-231270 A [Patent Document 2] Patent No. 7150099 Summary of the Invention [Problem to be solved by the invention]

[0004] One method of synthesizing hydrocarbon fuels using biomass is to use pyrolysis gas generated by a pyrolysis furnace, such as an externally heated pyrolysis furnace. In a kiln-type pyrolysis furnace, the biomass fed into the furnace is steamed with a high-temperature heat source, and decomposed into pyrolysis gas (combustible gas) and pyrolysis carbon (carbonized matter). The efficiency of such pyrolysis processing can be improved by performing it in a processing temperature range according to the purpose. For example, in a relatively low processing temperature range of about 300 degrees, the calorific value and energy yield can be maximized. On the other hand, in a relatively high processing temperature range of about 600 degrees, the amount of pyrolysis gas generated can be maximized.

[0005] The pyrolysis gas produced by pyrolysis of biomass in this way generally contains carbon monoxide and hydrogen in arbitrary proportions, and hydrocarbon fuels can be synthesized from the pyrolysis gas by the methane synthesis reaction shown in the following formula. CO+3H2→CH4+H2O (1) In the methane synthesis reaction shown in the above formula (1), optimal synthesis efficiency is obtained when the ratio (molar ratio) of hydrogen to carbon monoxide is about 3: 1. However, as described above, pyrolysis gas generated from biomass generally contains carbon monoxide and hydrogen in any ratio, so there is a risk of reduced synthesis efficiency if it is used directly in the methane synthesis reaction.

[0006] At least one embodiment of the present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a fuel synthesis system and a fuel synthesis method capable of synthesizing hydrocarbon fuels with high efficiency using pyrolysis gas produced from biomass. [Means for solving the problem]

[0007] In order to solve the above problems, the fuel synthesis system according to at least one embodiment of the present disclosure includes: a pyrolysis furnace for pyrolyzing biomass; a ratio adjusting unit for adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated in the pyrolysis furnace; a hydrocarbon fuel synthesis unit for synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the ratio adjusted; Equipped with.

[0008] In order to solve the above problems, a fuel synthesis method according to at least one embodiment of the present disclosure includes: generating pyrolysis gas by pyrolysis of biomass; adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas; synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the adjusted ratio; Equipped with. Effect of the Invention

[0009] According to at least one embodiment of the present disclosure, it is possible to provide a fuel synthesis system and a fuel synthesis method capable of synthesizing hydrocarbon fuels with high efficiency using pyrolysis gas produced from biomass. [Brief description of the drawings]

[0010] [Figure 1] 1 is an overall configuration diagram of a fuel synthesis system according to an embodiment; [Diagram 2] FIG. 2 is a schematic diagram of the furnace body 2b in FIG. [Diagram 3] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 4] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Diagram 5] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 6] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 7] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 8] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 9] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 10] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. [Figure 11] FIG. 13 is an overall configuration diagram of a fuel synthesis system according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the configurations described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] 1 is an overall configuration diagram of a fuel synthesis system 1A according to one embodiment. The fuel synthesis system 1A is a system for synthesizing a hydrocarbon fuel, which is a fuel, using biomass as a raw material, and includes a pyrolysis furnace 2, a ratio adjustment unit 4, a hydrocarbon fuel synthesis unit 6, and a carbon dioxide capture unit 8.

[0013] The pyrolysis furnace 2 is configured to generate pyrolysis gas Gh by pyrolyzing the input biomass. The pyrolysis furnace 2 includes a drying section 2a and a furnace body 2b. The drying section 2a is configured to dry the biomass BM input into the pyrolysis furnace 2, and is capable of separating moisture contained in the biomass BM and discharging it to the outside as a first wastewater DW1.

[0014] The furnace body 2b is, for example, a kiln-type pyrolysis furnace, and by steaming the biomass using a high-temperature heat source, the biomass is pyrolyzed to produce pyrolysis gas Gh (combustible gas) and carbide Cb (pyrolytic carbon) as a by-product.

[0015] The pyrolysis treatment temperature in the pyrolysis furnace 2 can be set appropriately. It is known that this treatment temperature affects the ratio of pyrolysis gas Gh and carbide Cb generated by pyrolysis of biomass. For example, when the treatment temperature is in a relatively low temperature range, for example, about 300 degrees, the heat generation amount and energy yield in pyrolysis can be maximized. On the other hand, when the treatment temperature is in a relatively high temperature range, for example, about 600 degrees, the generation amount of pyrolysis gas Gh can be maximized. In this embodiment, since the pyrolysis gas Gh generated by the pyrolysis treatment is used to synthesize hydrocarbon fuel as described later, the treatment temperature may be set to be in the latter temperature range so that the generation efficiency of the pyrolysis gas Gh is maximized.

[0016] Here, a specific configuration of the furnace body 2b, which is an externally heated (kiln type) pyrolysis furnace, will be illustratively described with reference to Fig. 2. Fig. 2 is a schematic configuration diagram of the furnace body 2b in Fig. 1.

[0017] The furnace body 2b has a biomass input section 20 into which the biomass BM dried in the drying section 2a is input. The biomass BM input into the biomass input section 20 is introduced into an inner cylinder 21 that communicates with the biomass input section 20. The inner cylinder 21 has a space 22 in which the biomass BM introduced therein can be stored, and an outer cylinder 23 is provided on the outside thereof.

[0018] The charcoal Cb discharged from the furnace body 2b and high-temperature heating gas Gk obtained by partial oxidation of the tar T separated in the scrubber 10 are introduced into the outer cylinder 23, and the biomass BM stored in the inner cylinder 21 is pyrolyzed by heating (steaming) through heat exchange with the heating gas Gk. The pyrolysis gas Gh and charcoal Cb generated by pyrolysis in the inner cylinder 21 are discharged from the pyrolysis gas discharge line 24 and the charcoal discharge line 25, respectively. The heating gas Gk after being used for heat exchange in the furnace body 2b is discharged from the pyrolysis furnace 2 as exhaust gas and ash.

[0019] In this embodiment, by using an externally heated (kiln-type) pyrolysis furnace as the furnace body 2b, it is possible to obtain pyrolysis gas Gh that contains a large amount of methane, which is a hydrocarbon fuel, compared to other types of furnaces such as a fluidized bed furnace. By using pyrolysis gas Gh that contains a large amount of methane in this way, the production efficiency of the hydrocarbon fuel in the system can be more effectively improved.

[0020] Returning to FIG. 1, the pyrolysis gas Gh discharged from the pyrolysis furnace 2 (furnace body 2b) via the pyrolysis gas discharge line 24 is supplied to the scrubber 10, whereby tar T and second wastewater DW2 are separated. The tar T separated in the scrubber 10 is supplied to the char discharge line 25, whereby it is reused together with the char Cb as fuel for heating the pyrolysis furnace 2, and is discharged as exhaust gas and ash.

[0021] The charcoal Cb discharged from the furnace body 2b and the tar T separated in the scrubber 10 are partially oxidized in a combustion device not shown in FIG. 1 (for example, the partial oxidation furnace 18 shown in FIG. 7, etc.), and the heated gas Gk generated by the partial oxidation is introduced into the drying section 2a and the outer casing 23 of the furnace body 2b (see FIG. 2).

[0022] The pyrolysis gas after separation of the tar T and the second wastewater DW2 in the scrubber 10 (hereinafter referred to as "separated pyrolysis gas Gh'") is supplied to the ratio adjustment unit 4. In the ratio adjustment unit 4, the ratio of hydrogen and carbon monoxide contained in the separated pyrolysis gas Gh' is adjusted. In this embodiment, the molar ratio of hydrogen and carbon monoxide contained in the separated pyrolysis gas Gh' is adjusted to a ratio (3:1) suitable for the methane synthesis reaction performed in the hydrocarbon fuel synthesis unit 6 described below. For example, if the separated pyrolysis gas Gh' supplied to the ratio adjustment unit 4 contains 29 vol% hydrogen (H2), 15 vol% hydrocarbon (CH4), 36 vol% carbon monoxide (CO), and 20 vol% carbon dioxide (CO2), the pyrolysis gas after ratio adjustment by the ratio adjustment unit 4 (hereinafter referred to as "ratio adjusted gas Gc") contains 40 vol% hydrogen (H2), 13 vol% hydrocarbon (CH4), 13 vol% carbon monoxide (CO), and 34 vol% carbon dioxide (CO2).

[0023] The ratio adjusting section 4 of this embodiment is configured as a shift reaction section for causing a shift reaction of a part of the carbon monoxide contained in the separated pyrolysis gas Gh' using moisture. This shift reaction is represented by the following formula. CO+H2O→H2+CO2(2) In the ratio adjustment section 4, such a shift reaction is performed to adjust the ratio of hydrogen and carbon monoxide contained in the separated pyrolysis gas Gh', thereby making it possible to suitably improve the efficiency of synthesis of hydrocarbon fuel by the methane synthesis reaction performed in the hydrocarbon fuel synthesis section 6. The water required for the shift reaction can be supplied from the outside.

[0024] The hydrocarbon fuel synthesis unit 6 is configured to generate synthesis gas Gg containing a hydrocarbon fuel, using the ratio adjustment gas Gc in which the ratio between hydrogen and carbon monoxide has been adjusted by the ratio adjustment unit 4. In the hydrocarbon fuel synthesis unit 6, hydrocarbons are synthesized by carrying out a methane synthesis reaction using the carbon monoxide and hydrogen contained in the ratio adjustment gas Gc. CO+3H2→CH4+H2O (3) As described above, the ratio adjustment gas Gc supplied to the hydrocarbon fuel synthesis unit 6 has the ratio of hydrogen and carbon monoxide adjusted in advance by the ratio adjustment unit 4 so as to be suitable for the methane synthesis reaction, so that hydrocarbon fuel can be obtained with good synthesis efficiency. In this embodiment, the synthesis gas Gg generated in the hydrocarbon fuel synthesis unit 6 contains, for example, 0 vol% hydrogen (H2), 44 vol% hydrocarbon (CH4), 0 vol% carbon monoxide (CO), and 56 vol% carbon dioxide (CO2). The water produced by the methane synthesis reaction is discharged to the outside as third wastewater DW3.

[0025] The carbon dioxide capture unit 8 is configured to capture carbon dioxide from the synthesis gas Gg generated in the hydrocarbon fuel synthesis unit 6. The carbon dioxide capture unit 8 can discharge the captured carbon dioxide to the outside, and take out the remaining hydrocarbon fuel to the outside as synthetic fuel (Gf).

[0026] 3 is an overall configuration diagram of a fuel synthesis system 1A' according to another embodiment. In the following embodiments, components corresponding to those in the fuel synthesis system according to the above embodiment are denoted by common reference numerals, and duplicated descriptions will be omitted unless otherwise specified.

[0027] The fuel synthesis system 1A' performs the above-mentioned shift reaction (see formula (2) above) in the ratio adjustment unit 4' so that the carbon monoxide contained in the separated pyrolysis gas Gh' becomes zero. As a result, the ratio adjustment gas Gc' does not contain carbon monoxide and becomes a mixed gas of hydrogen and carbon dioxide.

[0028] Then, in the hydrocarbon fuel synthesis section 6', a methane synthesis reaction is carried out using the hydrogen and carbon dioxide contained in the ratio adjustment gas Gc' to produce methane as a hydrocarbon fuel. This methane synthesis reaction is represented by the following formula. CO2+4H2→CH4+2H2O (4)

[0029] In this manner, the ratio adjustment section 4' may adjust the ratio of components different from those in the above-described embodiment, thereby generating a ratio adjustment gas Gc' suitable for the methane synthesis reaction carried out in the hydrocarbon fuel synthesis section 6'.

[0030] FIG. 4 is an overall configuration diagram of a fuel synthesis system 1B according to another embodiment.

[0031] The fuel synthesis system 1B further includes a wastewater recovery section 11 for recovering wastewater generated in the production process of the hydrocarbon fuel. In this embodiment, as described above, the wastewater generated in the production process of the hydrocarbon fuel includes the first wastewater DW1 discharged from the drying section 3, the second wastewater DW2 discharged from the scrubber 10, and the third wastewater DW3 discharged from the hydrocarbon fuel synthesis section 6. The wastewater recovery section 11 recovers at least a portion of the first wastewater DW1, the second wastewater DW2, or the third wastewater DW3, and supplies it to the ratio adjustment section 4 as moisture required for the shift reaction.

[0032] In this manner, in the fuel synthesis system 1B, the wastewater generated in the hydrocarbon production process is recovered and effectively utilized as moisture necessary for the shift reaction in the ratio adjustment unit 4, thereby effectively increasing the energy yield of the system.

[0033] 5 is an overall configuration diagram of a fuel synthesis system 1C according to another embodiment. In the fuel synthesis system 1C, the ratio adjustment unit 4 described above is configured to be able to adjust the ratio of hydrogen to carbon monoxide in the ratio adjustment gas Gc by using hydrogen supplied from an external source. Specifically, the ratio adjustment unit 4 of this embodiment includes a first hydrogen supply line 14 connected from a hydrogen supply source 12. The first hydrogen supply line 14 may be provided with a flow rate adjustment valve or a shutoff valve for adjusting the amount of hydrogen supplied from the hydrogen supply source 12.

[0034] In this manner, in the fuel synthesis system 1C, the ratio adjustment section 4 adjusts the ratio of hydrogen and carbon monoxide contained in the ratio adjustment gas Gc using hydrogen supplied from the hydrogen supply source 12 to be suitable for the methane synthesis reaction carried out in the hydrocarbon fuel synthesis section 6, thereby enabling efficient synthesis of hydrocarbon fuel.

[0035] 6 is an overall configuration diagram of a fuel synthesis system 1D according to another embodiment. In the fuel synthesis system 1D, hydrogen can also be supplied to the hydrocarbon fuel synthesis section 6 from the hydrogen supply source 12 configured as the ratio adjustment section 4 in the fuel synthesis system 1C via a second hydrogen supply line 16. As a result, even if the ratio adjustment section 4 is unable to appropriately adjust the ratio of hydrogen and carbon monoxide contained in the ratio adjustment gas Gc for some reason or if additional hydrogen is required in the hydrocarbon fuel synthesis section 6, hydrogen can be supplied to the hydrocarbon fuel synthesis section 6 to efficiently synthesize hydrocarbon fuel.

[0036] 7 is an overall configuration diagram of a fuel synthesis system 1E according to another embodiment. In the fuel synthesis system 1E, the ratio adjustment unit 4 is supplied with hydrogen generated by electrolysis of water in the water electrolysis unit 15, thereby making it possible to adjust the component ratio of the ratio adjustment gas Gc. The electrolysis reaction of water carried out in the water electrolysis unit 15 is represented by the following formula. 2H2O→2H2+O2(5)

[0037] In the fuel synthesis system 1E, the ratio adjustment section 4 supplies hydrogen produced by such an electrolysis reaction of water to the separated pyrolysis gas Gh', thereby adjusting the ratio of hydrogen and carbon monoxide contained in the ratio adjustment gas Gc, and advantageously improving the synthesis efficiency of hydrocarbon fuel by the methane synthesis reaction.

[0038] In the fuel synthesis system 1E, oxygen generated as a by-product in the electrolysis reaction of water in the ratio adjustment unit 4 is supplied to the partial oxidation furnace 18. In the partial oxidation furnace 18, hydrogen and carbon monoxide are contained by partially oxidizing the carbide Cb and tar T together with air taken in from the outside, and a heating gas Gk is generated to be supplied to the pyrolysis furnace 2, which is an externally heated (kiln-type) pyrolysis furnace. By supplying oxygen generated by the electrolysis reaction of water from the water electrolysis unit 15 to the partial oxidation furnace 18 in this way, the amount of air required from the outside can be reduced, and the heating gas Gk can be generated while suppressing the amount of nitrogen, which is an inert gas, mixed in. The heating gas Gk is supplied to the pyrolysis furnace 2 and used for indirect heating of the drying unit 2a and the furnace body 2b of the pyrolysis furnace 2. The heating gas Gk after being used for indirect heating in the pyrolysis furnace 2 is merged with the pyrolysis gas Gh' after separation in the ratio adjustment unit 4 via the heating gas supply line 27, and is supplied to the hydrocarbon fuel synthesis unit 6 as the ratio adjustment gas Gc. As a result, the amount of hydrocarbons synthesized in the hydrocarbon fuel synthesis section 6 can be increased by the hydrogen and carbon monoxide contained in the heated gas Gk.

[0039] 8 is an overall configuration diagram of a fuel synthesis system 1F according to another embodiment. In the fuel synthesis system 1F, similarly to the above-mentioned fuel synthesis system 1E, the ratio adjustment unit 4 adjusts the ratio of hydrogen and carbon monoxide contained in the ratio adjustment gas Gc using hydrogen generated by the electrolysis reaction of water in the water electrolysis unit 15 and the heating gas Gk after being used for indirect heating in the pyrolysis furnace 2, which is supplied via the heating gas supply line 27. In the fuel synthesis system 1F, the electric energy required for the electrolysis reaction of water thus performed in the ratio adjustment unit 4 is obtained in the power generation unit 30 by power generation using the heat generated by the methane synthesis reaction (exothermic reaction) performed in the hydrocarbon fuel synthesis unit 6.

[0040] Such a power generation section 30 may include, for example, a steam generator capable of generating steam using the heat generated by the methane synthesis reaction (exothermic reaction) carried out in the hydrocarbon fuel synthesis section 6, a steam turbine driven by the steam generated by the steam generator, and a generator connected to the steam turbine. In this case, when the steam turbine is driven by the steam generated by the steam generator, the generator connected to the steam turbine is driven, thereby generating electricity.

[0041] In this way, in the fuel synthesis system 1F, the water electrolysis reaction is carried out in the water electrolysis unit 15 using electric energy obtained by power generation utilizing the heat generated in the methane synthesis reaction in the hydrocarbon fuel synthesis unit 6. By effectively utilizing the energy obtained in the system in this way, the energy yield of the system can be effectively increased.

[0042] 9 is an overall configuration diagram of a fuel synthesis system 1G according to another embodiment. In the fuel synthesis system 1G, compared to the above-described fuel synthesis system 1F, the carbon dioxide recovered by the carbon dioxide recovery unit 8 is supplied to the partial oxidation furnace 18, and is effectively utilized for generating heated gas Gk in the partial oxidation furnace 18. In the partial oxidation furnace 18, the supplied carbon dioxide is used for generating carbon monoxide according to the following formula. CO2+C→2CO (6)

[0043] In this manner, in the fuel synthesis system 1G, the carbon dioxide captured in the carbon dioxide capture unit 8 is effectively utilized in the partial oxidation furnace 18, so that the carbon monoxide content of the heating gas Gk can be effectively increased.

[0044] 10 is an overall configuration diagram of a fuel synthesis system 1H according to another embodiment. The fuel synthesis system 1H is configured so that moisture generated when the biomass BM input into the pyrolysis furnace 2 is dried in the drying section 3 is supplied to the furnace body 2b, which is a kiln-type pyrolysis furnace, and to a partial oxidation furnace 18 for generating a heating gas Gk to be supplied to the pyrolysis furnace 2. As a result, the moisture generated in the drying section 3 is effectively utilized for pyrolysis in the pyrolysis furnace 2 and for generating a heating gas Gk in the partial oxidation furnace 18, thereby effectively increasing the yield of hydrocarbons and hydrogen.

[0045] FIG. 11 is an overall configuration diagram of a fuel synthesis system 1I according to another embodiment. The fuel synthesis system 1I is configured to supply the heat generated in the methane synthesis reaction in the hydrocarbon fuel synthesis section 6 to a hydrocarbon fuel production process. Specifically, the heat generated in the hydrocarbon fuel synthesis section 6 is supplied to the drying section 3, thereby covering the energy consumption in the drying section 3. In addition, the heat generated in the hydrocarbon fuel synthesis section 6 is supplied to the partial oxidation furnace 18, thereby covering the energy consumption in the production of the heating gas Gk supplied to the pyrolysis furnace 2. In addition, the heat generated in the hydrocarbon fuel synthesis section 6 is supplied to the carbon dioxide capture section 8, thereby covering the energy consumption when capturing carbon dioxide.

[0046] In this way, in the fuel synthesis system 1I, the amount of heat generated in the hydrocarbon fuel synthesis section 6 is effectively utilized in the hydrocarbon fuel production process, thereby effectively increasing the energy yield of the system.

[0047] The transfer of heat between the above-mentioned hydrocarbon fuel synthesis section 6 and other components can be performed by heat exchange via a heat medium such as liquid or gas.

[0048] As described above, according to each of the above embodiments, by adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas Gh generated from the biomass BM in the pyrolysis furnace 2, hydrocarbon fuel can be synthesized with good synthesis efficiency through the methane synthesis reaction.

[0049] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described embodiments may be combined as appropriate.

[0050] The contents described in each of the above embodiments can be understood, for example, as follows.

[0051] (1) A fuel synthesis system according to one embodiment includes: a pyrolysis furnace for pyrolyzing biomass; a ratio adjusting unit for adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated in the pyrolysis furnace; a hydrocarbon fuel synthesis unit for synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the ratio adjusted; Equipped with.

[0052] According to the above aspect (1), the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated from biomass in the pyrolysis furnace is adjusted. By carrying out a methane synthesis reaction on the pyrolysis gas in which the ratio of hydrogen and carbon monoxide has been adjusted in this manner, hydrocarbon fuel can be synthesized with good synthesis efficiency. As described above, the ratio adjusting unit adjusts the ratio of hydrogen and carbon monoxide. In some aspects, however, the ratio adjusting unit may adjust the ratio so that carbon monoxide becomes zero.

[0053] (2) In another embodiment, in the above embodiment (1), The ratio adjustment section is a shift reaction section for causing a shift reaction of at least a part of the carbon monoxide contained in the pyrolysis gas using moisture.

[0054] According to the above aspect (2), the ratio of hydrogen to carbon monoxide contained in the pyrolysis gas is adjusted by the shift reaction represented by the following formula. CO+H2O→H2+CO2 By such a shift reaction, the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas produced in the pyrolysis furnace is adjusted, and the efficiency of synthesis of hydrocarbon fuels by the methane synthesis reaction can be suitably improved.

[0055] (3) In another embodiment, in the above embodiment (2), A wastewater recovery unit for recovering wastewater generated in the process for producing the hydrocarbon fuel, At least a portion of the wastewater is supplied to the shift reaction section as the moisture.

[0056] According to the above aspect (3), wastewater generated in the hydrocarbon production process is recovered and used in the shift reaction. By effectively using the wastewater generated in the system for ratio adjustment in the shift reaction, the energy yield of the system can be effectively increased.

[0057] (4) In another embodiment, in the above embodiment (1), The ratio adjustment unit is capable of adjusting the ratio by supplying hydrogen generated by electrolysis of water to the pyrolysis gas, The electrolysis is performed using electrical energy generated using heat produced in the methane synthesis reaction.

[0058] According to the above aspect (4), the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas is adjusted by supplying hydrogen generated by electrolysis of water as shown in the following formula. 2H2O → 2H2+O2 By supplying hydrogen generated by such an electrolysis reaction of water, the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated in the pyrolysis furnace can be adjusted, and the efficiency of synthesis of hydrocarbon fuels by the methane synthesis reaction can be suitably improved. In addition, the water electrolysis reaction is carried out using the electric energy obtained by generating electricity using the heat generated by the methane synthesis reaction. By effectively utilizing the energy obtained within the system in this way, the energy yield of the system can be effectively increased.

[0059] (5) In another embodiment, in any one of the above (1) to (4), The heat generated in the methane synthesis reaction is provided to the process for producing the hydrocarbon fuel.

[0060] According to the above aspect (5), the heat generated in the methane synthesis reaction is effectively utilized in the process of producing hydrocarbon fuel, thereby effectively increasing the energy yield of the system.

[0061] (6) In another embodiment, in any one of the above (1) to (5), The system includes a partial oxidation furnace capable of generating heated gas to be supplied to the pyrolysis furnace for generating the pyrolysis gas by partially oxidizing at least one of the char generated in the pyrolysis furnace or the tar separated from the pyrolysis gas.

[0062] According to the above aspect (6), in the partial oxidation furnace, at least one of the char produced in the pyrolysis furnace or the tar separated from the pyrolysis gas is partially oxidized, thereby generating heated gas for generating pyrolysis gas in the pyrolysis furnace.

[0063] (7) In another embodiment, in the above embodiment (6), The pyrolysis furnace further includes a heating gas supply line for supplying the heating gas, after it has been used to generate the pyrolysis gas in the pyrolysis furnace, to the ratio adjustment unit.

[0064] According to the above aspect (7), the heated gas generated in the partial oxidation furnace is used to generate pyrolysis gas in the pyrolysis furnace, and then is supplied to the ratio adjustment unit via the heated gas supply line. This makes it possible to increase the concentrations of hydrogen and carbon monoxide in the ratio adjustment gas by the hydrogen and carbon monoxide contained in the heated gas, and to suitably increase the amount of hydrocarbons synthesized in the hydrocarbon fuel synthesis unit.

[0065] (8) In another embodiment, in any one of the above (1) to (7), A carbon dioxide capture unit for capturing carbon dioxide from the synthesis gas of the hydrocarbon fuel synthesis unit, At least a portion of the carbon dioxide recovered in the carbon dioxide recovery section is supplied to the partial oxidation furnace for use in generating the heating gas.

[0066] According to the above aspect (9), carbon dioxide generated in the process of producing hydrocarbon fuel is recovered and supplied to a partial oxidation furnace for producing heating gas to be supplied to a pyrolysis furnace. By effectively using the carbon dioxide produced in the system in this way to produce heating gas, the energy yield of the system can be effectively increased.

[0067] (9) In another embodiment, in any one of the above (1) to (8), The moisture generated when drying the biomass fed into the pyrolysis furnace is supplied to the pyrolysis furnace or is used to generate heated gas that is supplied to the pyrolysis furnace to generate the pyrolysis gas.

[0068] According to the above aspect (9), the moisture generated during drying of the biomass fed into the pyrolysis furnace is effectively utilized for pyrolysis in the pyrolysis furnace and for generating heated gas to be supplied to the pyrolysis furnace, thereby effectively increasing the energy yield of the system.

[0069] (10) In another embodiment, in any one of the above (1) to (9), The ratio adjusting unit adjusts the ratio of the hydrogen and the carbon monoxide to 3:1.

[0070] According to the above aspect (10), by adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas to 3:1, excellent synthesis efficiency of hydrocarbon fuel can be obtained in the methane synthesis reaction using the pyrolysis gas.

[0071] (11) A method for synthesizing a fuel according to one embodiment includes the steps of: generating pyrolysis gas by pyrolysis of biomass; adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas; synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the adjusted ratio; Equipped with.

[0072] According to the above aspect (11), the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated from biomass in the pyrolysis furnace is adjusted. By carrying out a methane synthesis reaction on the pyrolysis gas in which the ratio of hydrogen and carbon monoxide has been adjusted in this manner, hydrocarbon fuel can be synthesized with good synthesis efficiency. [Explanation of symbols]

[0073] 1A~1I Fuel synthesis system 2 Pyrolysis furnace 2a Drying section 2b Furnace body 4 Ratio adjustment section 6. Hydrocarbon Fuel Synthesis Section 8 Carbon Dioxide Capture Section 10 Scrubber 12 Hydrogen Source 14 First Hydrogen Supply Line 15 Water electrolysis section 16 Second Hydrogen Supply Line 18 Partial oxidation furnace 20 Biomass input section 21 Inner cylinder 22 Space 23 Outer cylinder 30 Power Generation Division BM Biomass DW1 1st drainage DW2 2nd drainage DW3 3rd drainage Cb carbide T Tar Gh Pyrolysis gas Gh´ Separated pyrolysis gas Gk Heating gas Gf synthetic fuel

Claims

1. a pyrolysis furnace for pyrolyzing biomass; a ratio adjusting unit for adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas generated in the pyrolysis furnace; a hydrocarbon fuel synthesis unit for synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the ratio adjusted; A fuel synthesis system comprising:

2. 2. The fuel synthesis system according to claim 1, wherein the ratio adjustment unit is a shift reaction unit for causing a shift reaction of at least a part of the carbon monoxide contained in the pyrolysis gas using moisture.

3. A wastewater recovery unit for recovering wastewater generated in the process for producing the hydrocarbon fuel, The fuel synthesis system according to claim 2 , wherein at least a portion of the wastewater is supplied to the shift reaction section as the moisture.

4. The ratio adjustment unit is capable of adjusting the ratio by supplying hydrogen generated by electrolysis of water to the pyrolysis gas, 2. The fuel synthesis system according to claim 1, wherein the electrolysis is performed using electrical energy generated using heat produced in the methane synthesis reaction.

5. 3. The fuel synthesis system according to claim 1 or 2, configured to supply heat generated in the methane synthesis reaction to the process for producing the hydrocarbon fuel.

6. 3. The fuel synthesis system according to claim 1 or 2, comprising a partial oxidation furnace capable of generating heated gas to be supplied to the pyrolysis furnace for generating the pyrolysis gas by partially oxidizing at least one of the char generated in the pyrolysis furnace or the tar separated from the pyrolysis gas.

7. The fuel synthesis system according to claim 6 , further comprising a heated gas supply line for supplying the heated gas to the ratio adjustment unit after the heated gas has been used in the pyrolysis furnace to generate the pyrolysis gas.

8. A carbon dioxide capture unit for capturing carbon dioxide from the synthesis gas of the hydrocarbon fuel synthesis unit, The fuel synthesis system according to claim 6 , wherein at least a portion of the carbon dioxide captured in the carbon dioxide capture section is supplied to the partial oxidation furnace for use in generating the heating gas.

9. 3. The fuel synthesis system according to claim 1 or 2, wherein moisture generated when drying the biomass to be input into the pyrolysis furnace is supplied to the pyrolysis furnace or is used to generate a heated gas to be supplied to the pyrolysis furnace to generate the pyrolysis gas.

10. 3. The fuel synthesis system according to claim 1, wherein the ratio adjusting unit adjusts the ratio of the hydrogen to the carbon monoxide to be 3:

1.

11. generating pyrolysis gas by pyrolysis of biomass; adjusting the ratio of hydrogen and carbon monoxide contained in the pyrolysis gas; synthesizing a hydrocarbon fuel by carrying out a methane synthesis reaction using the pyrolysis gas having the adjusted ratio; A fuel synthesis method comprising:

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