Fuel preparation system

Abstract

The present invention provides a fuel preparation system (100), which comprises a synthesis gas generation device (4) for generating synthesis gas including hydrogen and carbon monoxide using carbon-containing raw materials; a fuel preparation device (5) for preparing fuel using the generated synthesis gas; a water electrolysis device (2) for generating hydrogen by electrolyzing water; a hydrogen supply unit (3) for supplying the generated hydrogen to the synthesis gas generation device (4); a calculation unit (13) for calculating input energy based on a first energy of the carbon-containing raw materials, a second energy consumed when generating hydrogen, a third energy consumed when generating synthesis gas, and a fourth energy consumed when preparing fuel, and for calculating recovered energy based on a fifth energy of the prepared fuel; and a determination unit (14) for determining the supply amount of the supplied hydrogen based on the calculated input energy and the recovered energy.

Description

Technical Field

[0001] The present invention relates to a fuel preparation system for preparing fuel by electrolysis of water. Background Art

[0002] As such an apparatus, an apparatus for producing methanol using biomass as a raw material is known in the past (see, for example, Patent Document 1). The apparatus described in Patent Document 1 uses electricity generated by solar power generation and wind power generation to electrolyze water to generate hydrogen, and adds the hydrogen to a gas including carbon monoxide and hydrogen obtained by gasifying biomass to adjust the ratio of carbon monoxide to hydrogen to a ratio suitable for methanol synthesis.

[0003] However, when fuel is produced using renewable electricity such as solar power generation, wind power generation, etc. as in Patent Document 1, although carbon emissions can be reduced, energy loss and fuel production costs may increase.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2002-193858 (JP 2002-193858 A). Summary of the invention

[0007] A fuel preparation system according to a technical solution of the present invention comprises: a synthesis gas generating device which generates synthesis gas including hydrogen and carbon monoxide using a carbon-containing raw material; a fuel preparation device which prepares fuel using the synthesis gas generated by the synthesis gas generating device; a water electrolysis device which generates hydrogen by electrolyzing water; a hydrogen supply unit which supplies hydrogen generated by the water electrolysis device to the synthesis gas generating device; a calculation unit which calculates input energy based on a first energy possessed by the carbon-containing raw material, a second energy consumed when hydrogen is generated by the water electrolysis device, a third energy consumed when the synthesis gas is generated by the synthesis gas generating device, and a fourth energy consumed when the fuel preparation device prepares the fuel, and calculates recovered energy based on a fifth energy possessed by the fuel prepared by the fuel preparation device; and a determination unit which determines the supply amount of hydrogen supplied by the hydrogen supply unit based on the input energy and the recovered energy calculated by the calculation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The objects, features and advantages of the present invention will be further clarified through the following description of the embodiments in conjunction with the accompanying drawings.

[0009] Figure 1 This is a block diagram schematically showing an example of the overall configuration of a fuel preparation system according to an embodiment of the present invention.

[0010] Figure 2This is a block diagram schematically showing an example of the main part configuration of the fuel preparation system according to the embodiment of the present invention.

[0011] Figure 3 It is used to illustrate Figure 1 Diagram of the energy budget of the fuel preparation system.

[0012] Figure 4 It is used to illustrate Figure 1 A diagram showing the relationship between the electrolysis efficiency of a water electrolysis device and the energy conversion efficiency of a fuel preparation system.

[0013] Figure 5 It is used to illustrate Figure 1 A diagram showing the relationship between the amount of hydrogen supplied by a hydrogen supply unit and an evaluation value of the energy balance of a fuel preparation system.

[0014] Fig. 6A It is shown from Figure 1 A diagram showing an example of the recovery amount of each gas component recovered by the gasification device.

[0015] Figure 6B It is shown from Figure 1 A diagram showing another example of the amount of each gas component recovered by the gasification device. DETAILED DESCRIPTION

[0016] The following reference Figure 1 to Figure 6B The embodiment of the present invention is described. The fuel preparation system of the embodiment of the present invention uses renewable electricity such as solar power generation and wind power generation to electrolyze water to generate hydrogen (water electrolysis hydrogen), and uses the water electrolysis hydrogen to prepare so-called electrosynthetic fuel (e-fuel) from carbon-containing raw materials such as biomass. The following specifically describes an example of gasifying biomass to generate synthesis gas including hydrogen and carbon monoxide, and using the generated synthesis gas to prepare methanol fuel.

[0017] Figure 1 1 is a block diagram schematically showing an example of the overall structure of the fuel preparation system 100 according to the embodiment of the present invention. Figure 1 As shown, the fuel preparation system 100 includes a power generation device 1 , a water electrolysis device 2 , a hydrogen supply unit 3 , a gasification device 4 , and a fuel preparation device 5 .

[0018] The power generation device 1 is configured as, for example, a solar power generation device that converts solar energy into electrical energy using semiconductor elements, or a wind power generation device that converts wind energy into electrical energy using a windmill, to generate renewable electric power. The renewable electric power generated by the power generation device 1 is supplied to the water electrolysis device 2, the hydrogen supply unit 3, the gasification device 4, and the fuel preparation device 5.

[0019] The water electrolysis device 2 generates water electrolysis hydrogen by electrolyzing water using the renewable electricity generated by the power generation device 1. The water electrolysis device 2 is provided with sensors for measuring the electrolysis voltage of the water electrolysis device 2, the amount of electricity consumed by the water electrolysis device 2, the amount of water electrolysis hydrogen generated (e.g., mass flow rate) m, etc.

[0020] The hydrogen supply unit 3 is, for example, a part of the water electrolysis device 2, and supplies all the water electrolysis hydrogen generated by the water electrolysis device 2 to the gasification device 4. The hydrogen supply unit 3 has a flow regulating valve for adjusting, for example, the flow rate of water supplied to the water electrolysis device 2, and adjusts the amount of water electrolysis hydrogen generated by the water electrolysis device 2 by adjusting the supply amount of water, thereby adjusting the supply amount of water electrolysis hydrogen supplied to the gasification device 4. It should be noted that the hydrogen supply unit 3 can also be provided separately from the water electrolysis device 2, for example, it can also be composed of a hydrogen storage tank for storing the water electrolysis hydrogen generated by the water electrolysis device 2 and a flow regulating valve for adjusting the flow rate of water electrolysis hydrogen supplied from the hydrogen storage tank to the gasification device 4.

[0021] The gasification device 4 mainly includes a gasification furnace, and the gasification furnace is heated by using the renewable electricity generated by the power generation device 1 to perform gasification and generate synthesis gas. Biomass such as rice husk, bagasse, wood, etc. that has been pre-treated by drying and pulverization, oxygen and water (steam) are supplied to the gasification furnace of the gasification device 4, and synthesis gas containing hydrogen and carbon monoxide is generated by the reaction of the following formulas (i) to (v). Here, the reaction of the following formulas (ii) to (v) is an equilibrium reaction.

[0022] C+O 2 →CO 2 …(i)

[0023] C+H 2 O→CO+H 2 …(ii)

[0024] C+2H 2 →CH 4 …(iii)

[0025] C+CO 2 →2CO……(iv)

[0026] CO+H 2 O→CO 2 +H 2 …(v)

[0027] All the water electrolysis hydrogen generated by the water electrolysis device 2 is further supplied to the gasifier of the gasifier 4 through the hydrogen supply unit 3. The gasifier 4 is provided with sensors for measuring the amount of electricity consumed by the gasifier 4, the temperature and pressure of the synthesis gas in the gasifier, the amount of synthesis gas generated (e.g., mass flow rate), and the partial pressure (concentration) of each gas component. Based on the measured values ​​of these sensors, the supply amounts of biomass, oxygen, water, and water electrolysis hydrogen supplied to the gasifier can be adjusted.

[0028] By supplying water electrolysis hydrogen from the hydrogen supply unit 3, the equilibrium reaction (conversion reaction) in formula (v) is converted to the direction of promoting the generation of carbon monoxide and inhibiting the generation of carbon dioxide. In addition, by adjusting the supply amount m of water electrolysis hydrogen generated by the water electrolysis device 2 and supplied by the hydrogen supply unit 3, the synthesis gas can be adjusted to a composition suitable for subsequent fuel preparation. For example, when the fuel preparation device 5 prepares methanol fuel later, it can be adjusted in combination with the methanol synthesis reaction of the following formula (vi) so that the ratio (partial pressure ratio) of hydrogen to carbon monoxide in the synthesis gas becomes "2".

[0029] CO+2H 2 →CH 3 OH……(vi)

[0030] The fuel preparation device 5 mainly includes a reactor and a distillation tower. The synthesis gas generated by the gasification device 4 and subjected to post-treatment such as washing to remove ash and desulfurization is supplied to the reactor of the fuel preparation device 5, and methanol fuel is generated through the exothermic reaction of formula (vi). More specifically, the distillation tower is heated by renewable electricity generated by the power generation device 1, and the generated gas is distilled to obtain methanol fuel. Sensors for measuring temperature, pressure, the amount of methanol fuel generated (e.g., mass flow rate) and concentration are set in the reactor and distillation tower of the fuel preparation device 5.

[0031] The fuel preparation system 100 is provided with a compressor between the gasification device 4 and the fuel preparation device 5, and the synthesis gas is transported from the gasification device 4 to the fuel preparation device 5 using the renewable electricity generated by the power generation device 1. The fuel preparation system 100 is also provided with a sensor for measuring the amount of electricity consumed by the compressor.

[0032] In this way, the fuel preparation system 100 can suppress the emission of carbon dioxide as a whole by using renewable energy. However, when the energy loss increases during the conversion of renewable energy, the energy loss of the entire system and the fuel preparation cost may increase. Therefore, in this embodiment, the fuel preparation system is configured as follows so that by paying attention to the energy balance of the entire system, the emission of carbon dioxide during fuel preparation can be suppressed while suppressing the energy loss and fuel preparation cost.

[0033] Figure 21 is a block diagram schematically showing an example of the main structure of the fuel preparation system 100 according to the embodiment of the present invention. Figure 2 As shown, the fuel preparation system 100 includes a controller 10, and a sensor group 6 including the above-mentioned sensors and a hydrogen supplier 3 are connected to the controller 10. The controller 10 controls the operation of the hydrogen supplier 3 by executing a predetermined process based on signals from the sensor group 6.

[0034] The controller 10 is composed of a computer including a CPU (central processing unit) or the like, a storage unit 12 such as a ROM (read only memory) and a RAM (random access memory), and other peripheral circuits not shown in the figure, such as an I / O (input / output) interface. The storage unit 12 stores various control programs and information such as threshold values ​​used in the programs. The computing unit 11 has a calculation unit 13 and a determination unit 14 as functional structures. That is, the CPU or the like computing unit 11 of the controller 10 functions as the calculation unit 13 and the determination unit 14.

[0035] Figure 3 This is a diagram for explaining the energy balance of the fuel preparation system 100, showing an example of the energy input per unit of raw material and the energy recovered when preparing methanol fuel using biomass as raw material. The energy input includes the energy (calorific value) E1 of a unit amount of biomass and the energies E2 to E5 required for gasification of the raw material (heating of the gasifier), distillation of the fuel, transportation of the synthesis gas, and electrolysis of water. The energy recovered includes the energy (calorific value) E6 of the methanol fuel produced using a unit amount of biomass.

[0036] Figure 3 In FIG. 1 , the energy E(0) when no water is supplied by the hydrogen supply unit 3 for electrolysis of hydrogen is represented by a dotted line, and the energy E(m) when water is supplied for electrolysis of hydrogen is represented by a solid line. Figure 3 As shown, when water electrolysis hydrogen is supplied from the hydrogen supply unit 3, the energy E5(m) required for electrolysis is input according to the supply amount of water electrolysis hydrogen, and the energy E2(m) to E4(m) required for gasification, distillation and transportation increases. On the other hand, the energy E6(m) recovered as methanol fuel increases.

[0037] The calculation unit 13 calculates the sum of the respective energies E1(0) to E4(0) and E1(m) to E5(m) as the reference input energy Ein(0) and input energy Ein(m) respectively when no water electrolysis hydrogen is supplied and when water electrolysis hydrogen is supplied according to the following equations (vii) and (viii). In addition, as shown in the following equations (ix) and (x), when no water electrolysis hydrogen is supplied and when water electrolysis hydrogen is supplied by the hydrogen supply unit 3, the respective energies E6(0) and E6(m) are calculated as the reference recovery energy Eout(0) and recovery energy Eout(m) respectively.

[0038] Ein(0)=E1(0)+E2(0)+E3(0)+E4(0)……(vii)

[0039] Ein(m)=E1(m)+E2(m)+E3(m)+E4(m)+E5(m)……(viii)

[0040] Eout(0)=E6(0)……(ix)

[0041] Eout(m)=E6(m)……(x)

[0042] The energy E2 required for gasification of the raw material can be calculated based on the standard reaction enthalpy and the amount of synthesis gas generated using a unit amount of biomass, but can also be calculated based on the amount of electricity consumed by the gasification device 4. The energy E3 required for distillation of the fuel can be calculated based on the amount and concentration of methanol fuel generated using a unit amount of biomass, but can also be calculated based on the amount of electricity consumed by the fuel preparation device 5. The energy E4 required for transporting the synthesis gas can be calculated based on the compression work per unit amount and the amount of synthesis gas generated using a unit amount of biomass, but can also be calculated based on the amount of electricity consumed by the compressor.

[0043] The energy E5 required for the electrolysis of water can be calculated by the following formula (xi) based on the standard reaction enthalpy, the amount of hydrogen generated by water electrolysis using a unit amount of biomass, and the electrolysis efficiency p of the water electrolysis device 2. The electrolysis efficiency p of the water electrolysis device 2 can be calculated by the following formula (xii) based on the electrolysis voltage (for example, 1.48V) at an electrolysis efficiency of 100% and the electrolysis voltage of the water electrolysis device 2. The energy E5 required for the electrolysis of water can also be calculated based on the amount of electricity consumed by the water electrolysis device 2. It should be noted that when water is electrolyzed using renewable electricity such as solar power generation and wind power generation, sometimes the water electrolysis device 2 cannot be operated at rated power due to insufficient electricity due to meteorological conditions. In such a case, the electrolysis efficiency p of the water electrolysis device 2 is reduced.

[0044] E5 = (standard reaction enthalpy) × (amount of hydrogen produced by water electrolysis) / p……(xi)

[0045] p=1.48 / (electrolysis voltage)……(xii)

[0046] The calculation unit 13 calculates the difference ΔEin(m) between the reference input energy Ein(0) and the input energy Ein(m) and the difference ΔEout(m) between the reference recovery energy Eout(0) and the recovery energy Eout(m) by the following equations (xiii) and (xiv). In addition, the energy conversion efficiency of the fuel preparation system 100 is calculated by the following equation (xv). In addition, the evaluation value of the energy balance is calculated by the following equation (xvi).

[0047] ΔEin(m)=Ein(m)-Ein(0)……(xiii)

[0048] ΔEout(m)=Eout(m)-Eout(0)......(xiv)

[0049] (Energy conversion efficiency) = Eout / Ein

[0050] =E6 / (E1+E2+E3+E4+E5)……(xv)

[0051] (Evaluation value of energy balance) = ΔEout(m) / ΔEin(m)……(xvi)

[0052] Figure 4 2 is a diagram for explaining the relationship between the electrolysis efficiency p of the water electrolysis device 2 and the energy conversion efficiency of the fuel preparation system 100. Figure 4 In the figure, the dotted line represents the energy conversion efficiency Eout(0) / Ein(0) when the hydrogen supply unit 3 does not supply water electrolysis hydrogen, and the solid line represents the energy conversion efficiency Eout(m) / Ein(m) when the hydrogen supply unit 3 supplies water electrolysis hydrogen. Figure 4 As shown, the higher the electrolysis efficiency p of the water electrolysis device 2, the higher the energy conversion efficiency Eout(m) / Ein(m) of the fuel preparation system 100 when water is supplied for electrolysis of hydrogen. Therefore, under operating conditions above the specified electrolysis efficiency p0, the energy conversion efficiency is improved when water is supplied for electrolysis of hydrogen than when water is not supplied for electrolysis of hydrogen, but under operating conditions below the specified electrolysis efficiency p0, the energy conversion efficiency is reduced when water is supplied for electrolysis of hydrogen than when water is not supplied for electrolysis of hydrogen.

[0053] Figure 5 is a diagram for explaining the relationship between the supply amount m of water electrolysis hydrogen gas of the hydrogen supply unit 3 and the evaluation value of the energy balance of the fuel preparation system 100, and shows the relationship between the supply amount m of water electrolysis hydrogen gas of the hydrogen supply unit 3 and the evaluation value of the energy balance of the fuel preparation system 100. Figure 4 An example of the evaluation value when the supply amount m of water electrolysis hydrogen is changed under the operating conditions corresponding to the electrolysis efficiency p1. Figure 5 As shown, there is an optimal amount m1 corresponding to the operating conditions such as the electrolysis efficiency p in the supply amount m of the water electrolysis hydrogen. By adjusting the supply amount m of the water electrolysis hydrogen to the appropriate range m1a~m1b where the evaluation value of the energy balance is greater than 1, the energy conversion efficiency can be improved relative to the case where the water electrolysis hydrogen is not supplied. On the other hand, when the water electrolysis hydrogen is supplied in excess of the appropriate range m1a~m1b (for example, 1.5 times the optimal amount m1), the evaluation value of the energy balance is lower than 1, and the energy conversion efficiency is lower than when the water electrolysis hydrogen is not supplied.

[0054] Fig. 6A and Figure 6BIt is a diagram showing an example of the recovery amount (e.g., mass flow rate) of each gas component recovered by the gasification device 4, wherein the dotted line represents the recovery amount when the hydrogen supply unit 3 does not supply water electrolytic hydrogen, and the solid line represents the recovery amount when water electrolytic hydrogen is supplied. Fig. 6A Show Figure 5 An example of the recovery amount of each gas component when the supply amount m of hydrogen gas from water electrolysis is the optimal amount m1, Figure 6B An example of the recovery amount of each gas component when the supply amount m of water electrolysis hydrogen gas is an excess amount m2 is shown.

[0055] exist Fig. 6A In the example, the supply amount m of water electrolysis hydrogen is adjusted to the optimal amount m1, and the recovery amount of carbon monoxide corresponding to the production amount of methanol fuel increases to 1.5 times that when water electrolysis hydrogen is not supplied. Figure 6B In the example, the supply amount m of water electrolysis hydrogen is adjusted to an excess amount m2 that is 1.5 times the optimal amount m1, and the recovery amount of carbon monoxide increases to 1.7 times that of the case when no water electrolysis hydrogen is supplied. Fig. 6A Examples and Figure 6B When compared with the example of , the supply amount m of water electrolysis hydrogen corresponding to the input energy increases to 1.5 times, while the recovery amount of carbon monoxide corresponding to the recovered energy only increases to about 1.1 times. In this way, when the supply amount m of water electrolysis hydrogen is increased beyond the appropriate range, the energy conversion efficiency decreases compared to when no water electrolysis hydrogen is supplied.

[0056] The determination unit 14 determines the supply amount m of the water electrolysis hydrogen gas supplied by the hydrogen supply unit 3 based on the evaluation value ΔEout(m) / ΔEin(m) of the energy balance calculated by the calculation unit 13. That is, the supply amount m of the water electrolysis hydrogen gas is determined in such a way that the evaluation value ΔEout(m) / ΔEin(m) of the energy balance is greater than 1. Thus, by supplying the water electrolysis hydrogen gas, the fuel preparation system 100 can be operated in a region where the energy conversion efficiency is improved.

[0057] The present embodiment can achieve the following effects.

[0058] (1) The fuel preparation system 100 comprises: a gasification device 4 that generates a synthesis gas including hydrogen and carbon monoxide using biomass; a fuel preparation device 5 that generates methanol fuel using the synthesis gas generated by the gasification device 4; a water electrolysis device 2 that generates hydrogen by electrolyzing water; a hydrogen supply unit 3 that supplies the hydrogen generated by the water electrolysis device 2 to the gasification device 4; a calculation unit 13 that calculates input energy Ein(m) based on energy E1 of the biomass, energy E5 consumed when generating hydrogen by the water electrolysis device 2, energy E2 consumed when generating the synthesis gas by the gasification device 4, and energy E3 consumed when generating methanol fuel by the fuel preparation device 5, and calculates recovery energy Eout(m) based on energy E6 of the methanol fuel prepared by the fuel preparation device 5; and a determination unit 14 that determines a supply amount m(m) of hydrogen to be supplied by the hydrogen supply unit 3 based on the input energy Ein(m) and the recovery energy Eout(m) calculated by the calculation unit 13. Figure 1 to Figure 3 ).

[0059] In this way, by monitoring the energy conversion efficiency of the entire fuel preparation system 100 through input energy Ein(m) and recovered energy Eout(m) and determining the supply amount m of water electrolysis hydrogen, it is possible to suppress energy loss during fuel preparation. That is, the loss of renewable energy during energy conversion increases depending on meteorological conditions, etc., but by determining the supply amount m of water electrolysis hydrogen in a manner that improves the energy conversion efficiency compared to when water electrolysis hydrogen is not supplied, it is possible to suppress energy loss.

[0060] (2) The calculation unit 13 calculates the energy E5 consumed when the water electrolysis device 2 generates hydrogen based on the amount of hydrogen generated by the water electrolysis device 2 and the electrolysis efficiency p of the water electrolysis device 2. In this case, the electrolysis efficiency p is calculated based on the actually measured electrolysis voltage, and the energy E5 consumed when the water electrolysis device 2 generates hydrogen can be calculated.

[0061] (3) The calculation unit 13 calculates the energy E5 consumed when the water electrolysis device 2 generates hydrogen based on the amount of electricity consumed when the water electrolysis device 2 generates hydrogen. In this case, the energy E5 consumed when the water electrolysis device 2 generates hydrogen can be calculated based on the actually measured amount of electricity.

[0062] (4) The calculation unit 13 also calculates the evaluation value ΔEout(m) / ΔEin(m) of the energy balance based on the difference ΔEin(m) between the reference input energy Ein(0) when the hydrogen supply unit 3 does not supply hydrogen and the input energy Ein(m) when the hydrogen supply unit 3 supplies hydrogen, and the difference ΔEout(m) between the reference recovery energy Eout(0) when the hydrogen supply unit 3 does not supply hydrogen and the recovery energy Eout(m) when the hydrogen supply unit 3 supplies hydrogen. The determination unit 14 determines the supply amount m of hydrogen supplied by the hydrogen supply unit 3 based on the evaluation value ΔEout(m) / ΔEin(m) of the energy balance calculated by the calculation unit 13. That is, the supply amount m of water electrolysis hydrogen is determined in such a way that the evaluation value ΔEout(m) / ΔEin(m) of the energy balance is greater than 1. As a result, the fuel preparation system 100 can be operated in an area where the energy conversion efficiency of the entire system is improved due to the input of water electrolysis hydrogen.

[0063] (5) The water electrolysis device 2 uses renewable electricity to electrolyze water. When using renewable electricity such as solar power generation and wind power generation, the water electrolysis device 2 may not be able to operate at rated power due to insufficient electricity due to meteorological conditions. In such a case, the electrolysis efficiency p of the water electrolysis device 2 decreases, and sometimes the energy conversion efficiency of the entire fuel preparation system 100 decreases by supplying water to electrolyze hydrogen. By monitoring the energy conversion efficiency of the entire fuel preparation system 100 by input energy Ein(m) and recovered energy Eout(m), energy loss during fuel preparation can be appropriately suppressed.

[0064] In the above embodiment, Figure 1 In the examples of the gasification device 4 generating synthesis gas using biomass, the synthesis gas generating device that generates synthesis gas containing hydrogen and carbon monoxide using carbon-containing raw materials is described, but the synthesis gas generating device is not limited to these. For example, carbon dioxide can be separated and recovered from factory exhaust gas, etc. by DAC (Direct Air Capture), and hydrogen can be electrolyzed using the recovered carbon dioxide and water according to the reverse equilibrium reaction (reverse conversion reaction) of formula (v) to generate carbon monoxide and water.

[0065] In the above embodiment, Figure 1 In the examples of preparing methanol fuel by the fuel preparation device 5, the fuel preparation device using synthesis gas is not limited to this. For example, methanol can be further synthesized into gasoline fuel by the MTG (methanol-to-gasoline) method, and light oil fuel can be synthesized by the FT (Fischer-Tropsch) method using synthesis gas.

[0066] In the above embodiment, an example in which renewable electricity is used for electrolysis of water is described, but the water electrolysis device is not limited thereto. For example, electricity from a commercial power system may be used instead of renewable electricity, or these electricity may be used in combination.

[0067] In the above embodiment, Figure 1 In the examples of supplying all the water electrolysis hydrogen generated by the water electrolysis device 2 to the gasification device 4, the configuration of the hydrogen supply unit for supplying the hydrogen generated by the water electrolysis device to the synthesis gas generation device is not limited to this. For example, it may also be a device having a hydrogen storage tank for storing the water electrolysis hydrogen, a flow regulating valve for adjusting the flow of the water electrolysis hydrogen to the gasification device, etc. In addition, when the electrolysis efficiency p of the water electrolysis device 2 is lower than the specified electrolysis efficiency p0 due to meteorological conditions, etc., the operation of the water electrolysis device 2 may also be stopped.

[0068] In the above embodiment, Figure 3 In the examples above, specific examples of the energy input to the fuel preparation system 100 and the energy recovered are shown and described, but the energy input and the energy recovered are not limited to these.

[0069] One or more of the above-described embodiments and modifications may be arbitrarily combined, and modifications may be combined with each other.

[0070] According to the present invention, energy loss and fuel preparation cost during fuel preparation can be suppressed.

[0071] The present invention has been described above in conjunction with the preferred embodiments, but it should be understood by those skilled in the art that various modifications and changes can be made without departing from the scope of the disclosure of the claims set forth below.

Claims

1. A fuel preparation system (100), characterized in that: have: A synthesis gas generation device (4) which generates synthesis gas including hydrogen and carbon monoxide using carbon-containing raw materials; A fuel preparation device (5) for preparing fuel using the synthesis gas generated by the synthesis gas generation device (4); A water electrolysis device (2) which generates hydrogen by electrolyzing water; a hydrogen supply unit (3) for supplying hydrogen generated by the water electrolysis device (2) to the synthesis gas generation device (4); as well as a calculation unit (13) for calculating input energy based on a first energy of the carbon-containing raw material, a second energy consumed when hydrogen is generated by the water electrolysis device (2), a third energy consumed when synthesis gas is generated by the synthesis gas generation device (4), and a fourth energy consumed when fuel is prepared by the fuel preparation device (5), and calculating recovered energy based on a fifth energy of the fuel prepared by the fuel preparation device (5); The calculation unit (13) calculates an evaluation value of energy balance based on a difference ΔEin(m) between a reference input energy when the hydrogen supply unit (3) does not supply hydrogen and the input energy when the hydrogen supply unit (3) supplies hydrogen, and a difference ΔEout(m) between a reference recovery energy when the hydrogen supply unit (3) does not supply hydrogen and the recovery energy when the hydrogen supply unit (3) supplies hydrogen, wherein the evaluation value of energy balance is ΔEout(m) / ΔEin(m). A determination unit (14) determines the supply amount of hydrogen supplied by the hydrogen supply unit (3) on the condition that the evaluation value of the energy balance calculated by the calculation unit (13) is 1 or more.

2. The fuel preparation system (100) according to claim 1, characterized in that: The calculation unit (13) calculates the second energy based on the amount of hydrogen generated by the water electrolysis device (2) and the electrolysis efficiency of the water electrolysis device (2).

3. The fuel preparation system (100) according to claim 1, characterized in that: The calculation unit (13) calculates the second energy based on the amount of electricity consumed when the water electrolysis device (2) generates hydrogen.

4. The fuel preparation system (100) according to any one of claims 1 to 3, characterized in that: The water electrolysis device (2) uses renewable electricity to electrolyze water.

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