Synthetic production system and carbon dioxide treatment system

Abstract

To provide a synthetic material production system that eliminates the need for a carbon dioxide recovery unit dedicated to a synthesis plant and can reduce the facility cost, and to provide a carbon dioxide processing system.SOLUTION: A synthetic material production system includes: a synthesis plant in which by synthesizing a hydrogen-containing gas and a carbon dioxide a synthetic material is produced; and a carbon dioxide feed line for feeding the carbon dioxide from a recovery and storage plant that includes a recovery unit for recovering the carbon dioxide from a carbon dioxide-containing gas, and a press-in facility for immobilizing the carbon dioxide recovered in the stratum, to the synthesis plant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a synthetic production system and a carbon dioxide processing system. [Background technology]

[0002] As a measure to prevent global warming, it is necessary to reduce carbon dioxide emissions associated with the use of fossil fuels. One proposed solution is to recover carbon dioxide from carbon dioxide-containing gases and use it as a resource for synthetic products (fuel, chemical materials, etc.). In this case, it is possible to reduce carbon dioxide emissions into the atmosphere. For example, Patent Document 1 discloses a system that generates fuel by synthesizing hydrogen obtained by electrolysis of water or seawater with carbon dioxide separated from exhaust gas from a power generation facility.

[0003] Another solution is an attempt to focus on the processing of carbon dioxide rather than its utilization. For example, Patent Document 2 discloses a carbon dioxide capture device that uses a PSA unit and a carbon dioxide separation membrane to capture carbon dioxide from a carbon dioxide-containing gas. The hydrogen-rich gas obtained after carbon dioxide capture is used as product hydrogen. Meanwhile, the captured carbon dioxide is transported in a liquefied state to another location and stored underground or in the sea at the destination. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-46460 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-247636 Summary of the Invention [Problem to be solved by the invention]

[0005] As in Patent Document 1, if a dedicated carbon dioxide capture device (i.e., a carbon dioxide capture device dedicated to a synthesis plant) is provided to capture only the carbon dioxide used in the production of a synthetic product, the equipment costs increase. As a result, the production costs of the synthetic product also increase. Patent Document 2 does not disclose any solution to this problem.

[0006] In view of the above circumstances, an object of the present disclosure is to provide a synthetic product production system and a carbon dioxide treatment system that can eliminate the need for a carbon dioxide recovery device dedicated to the synthesis plant and reduce equipment costs. [Means for solving the problem]

[0007] The synthetic production system according to the present disclosure comprises: a synthesis plant for producing a compound by synthesizing a hydrogen-containing gas and carbon dioxide; a carbon dioxide supply line for supplying the carbon dioxide to the synthesis plant from a capture and storage plant including a capture device for capturing the carbon dioxide from a carbon dioxide-containing gas and an injection facility for immobilizing the captured carbon dioxide in a geological formation; Equipped with.

[0008] The carbon dioxide processing system according to the present disclosure comprises: The synthetic production system; a capture and storage plant including a capture device for capturing carbon dioxide from a carbon dioxide-containing gas and an injection facility for immobilizing the captured carbon dioxide in a geological formation; a power generation facility configured to generate electricity by combusting the off-gas from the capture device of the capture and storage plant; an unreacted gas supply line for supplying at least a portion of the unreacted gas discharged from the synthesis plant to the power generation facility from a pipe for recirculating the unreacted gas; Equipped with. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a synthetic product production system and a carbon dioxide treatment system that can eliminate the need for a carbon dioxide recovery device dedicated to the synthesis plant and reduce equipment costs. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating a schematic configuration of a carbon dioxide processing system according to an embodiment of the present disclosure. [Figure 2] 1 is a diagram illustrating a schematic configuration of a carbon dioxide treatment system according to an embodiment. [Figure 3] 1 is a diagram illustrating a schematic configuration of a carbon dioxide treatment system according to an embodiment. [Figure 4] 1 is a diagram illustrating a schematic configuration of a carbon dioxide treatment system according to an embodiment. [Figure 5] 1 is a diagram illustrating a schematic configuration of a carbon dioxide processing system according to an embodiment.

[0011] Hereinafter, several embodiments will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the invention. For example, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement exactly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions representing shapes such as a square shape or a cylindrical shape not only represent shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. On the other hand, the expressions "comprise," "include," "have," "includes," or "have" of one element are not exclusive expressions that exclude the presence of other elements.

[0012] 1 to 5 are diagrams each schematically illustrating a configuration of a carbon dioxide processing system 1 (1A, 1B, 1C, 1D, 1E) according to an embodiment of the present disclosure. For example, as shown in FIGS. 1 to 5, the carbon dioxide processing system 1 (1A, 1B, 1C, 1D, 1E) includes a synthetic product production system 2 and a capture and storage plant 3.

[0013] 1 to 5, the synthetic product production system 2 includes a synthesis plant 10 that produces a synthetic product by synthesizing a hydrogen-containing gas with carbon dioxide, and a carbon dioxide supply line 11 for supplying carbon dioxide from the capture and storage plant 3 to the synthesis plant 10. The synthesis plant 10 is configured to produce at least one of methanol, methane, and dimethyl ether as the synthetic product. The synthesis plant 10 also discharges water as a by-product of the synthetic product.

[0014] In some embodiments, for example, as shown in Figures 2 and 3, the synthesis plant 10 may include a purification unit 12 for purifying carbon dioxide compressed by the injection facility 30 of the capture and storage plant 3, and a purification unit 13 for purifying hydrogen from the off-gas after the capture unit 20 of the capture and storage plant 3 captures carbon dioxide from the carbon dioxide-containing gas.

[0015] The synthesis plant 10 includes a catalyst 16 for chemically reacting hydrogen and carbon dioxide to produce a synthetic product, and a gas-liquid separation device 17 for separating the synthetic product produced by the chemical reaction into gas and liquid. The synthesis plant 10 may also include a compressor 15 configured to compress the unreacted gas separated by the gas-liquid separation device 17 and supply it again upstream of the catalyst 16. In other words, the unreacted gas may be recycled. The synthesis plant 10 also includes a distillation device 18 configured to distill the liquid discharged from the gas-liquid separation device 17 to separate it into water and a final product (a high-purity synthetic product), as shown in, for example, FIGS. 2, 3, and 4.

[0016] The synthesis plant 10 may include a feed compressor 14 upstream of the catalyst 16. The feed compressor 14 may be provided downstream of the purification units 12 and 13, for example, as shown in Figures 2 and 3, and configured to compress a mixture of carbon dioxide and hydrogen, or may be configured to compress hydrogen, as shown in Figure 4.

[0017] The capture and storage plant 3 includes a capture device 20 for capturing carbon dioxide from a carbon dioxide-containing gas, and an injection facility 30 for compressing the captured carbon dioxide and immobilizing it in a geological formation. Note that the capture and storage plant 3 is not limited to a configuration that aims only at immobilizing carbon dioxide in a geological formation. The capture and storage plant 3 may also be configured to perform EOR (Enhanced Oil Recovery), that is, to inject carbon dioxide into an oil reservoir in order to efficiently recover crude oil.

[0018] In some embodiments, the injection facility 30 includes at least one compressor (e.g., compressors 31, 32, and 33 in FIG. 1 ), and the carbon dioxide supply line 11 may be connected downstream of the at least one compressor (e.g., any one of compressors 31, 32, and 33 in FIG. 1 ) and configured to supply compressed carbon dioxide to the synthesis plant 10.

[0019] The at least one compressor may be one compressor or multiple compressors (for example, three compressors 31, 32, and 33 in FIG. 1). The carbon dioxide supply line 11 may be connected downstream of the at least one compressor (for example, compressors 31, 32, and 33 in FIG. 1). Although three compressors 31, 32, and 33 are shown in FIG. 1, the number of compressors is not limited to this.

[0020] 1 , for example, the injection facility 30 may include a plurality of compressors 31, 32, and 33 connected in series, and the carbon dioxide supply line 11 (11B) may be connected to a carbon dioxide flow path in the injection facility 30 as indicated by the dotted arrow, and may be configured to supply carbon dioxide compressed by one or more of the plurality of compressors 31, 32, and 33 to the synthesis plant 10. In other words, carbon dioxide may be supplied to the synthesis plant 10 from a flow path in the compression process in the multi-stage compression.

[0021] In some embodiments, for example, as shown in FIG. 4 , the carbon dioxide processing system 1 (1D) may include a feed compressor 14 for compressing the hydrogen-containing gas at a position upstream of the synthesis plant 10, and the carbon dioxide supply line 11 may be connected to a position downstream of the feed compressor 14 and upstream of the synthesis plant 10.

[0022] 5, the synthetic product production system 2 may include a sensor 51 for detecting the supply amount of hydrogen-containing gas, a control device 52 configured to output a command according to the supply amount of hydrogen-containing gas detected by the sensor 51, and a flow rate adjusting device 53 provided in the carbon dioxide supply line 11 and configured to adjust the amount of carbon dioxide supplied to the synthesis plant 10 according to a command from the control device 52. For example, the flow rate adjusting device 53 may include a valve for adjusting the flow rate, and the control device 52 may control the opening degree of the valve according to a command.

[0023] 2 and 3, the carbon dioxide processing system 1 (1B, 1C) may include a power generation facility 40 configured to generate power by combusting off-gas from the capture device 20 of the capture and storage plant 3, and an unreacted gas supply line 19 for supplying at least a portion of the unreacted gas (purge gas) discharged from the catalyst 16 of the synthesis plant 10 to the power generation facility 40. The unreacted gas includes, for example, methane.

[0024] The carbon dioxide treatment system 1 may include a purge line 63 into which a replacement gas is injected during shutdown of the synthesis plant 10, as shown in FIG. 3, and the unreacted gas supply line 19 may be connected to the purge line 63. For example, as shown in FIG. 3, the replacement gas is injected as indicated by the dotted arrows when valves 61 and 62 are closed, filling the piping downstream thereof. In the example shown in FIG. 3, the purge line 63 includes piping from the valves 61 and 62 to the gas-liquid separator 17, and further includes piping for recirculating the unreacted gas (purge gas). The replacement gas is an inert gas (e.g., nitrogen gas).

[0025] 1 to 5, the carbon dioxide-containing gas supplied to the recovery unit 20 may be off-gas separated by a PSA (Pressure Swing Adsorption) system in an oil refinery. The hydrogen-containing gas may be off-gas from the recovery unit 20, or may be hydrogen-containing gas produced using by-product hydrogen or renewable energy.

[0026] (summary) The contents described in each of the above embodiments can be understood, for example, as follows.

[0027] (1) A synthetic product production system (2) according to one embodiment of the present disclosure includes: a synthesis plant (10) for producing a compound by synthesizing a hydrogen-containing gas with carbon dioxide; a carbon dioxide supply line (11) for supplying the carbon dioxide to the synthesis plant (10) from a capture and storage plant (3) including a capture device (20) for capturing the carbon dioxide from a carbon dioxide-containing gas and an injection facility (30) for immobilizing the captured carbon dioxide in a geological formation; Equipped with.

[0028] Unlike facilities for using carbon dioxide to generate synthetic products (for example, a synthesis plant 10 configured to produce synthetic products), facilities for storing carbon dioxide (for example, a capture and storage plant 3) must be installed in a location where carbon dioxide can be stored, and there are restrictions on the installation location. For this reason, it was not possible to combine these facilities.

[0029] However, a carbon dioxide capture device (20) is provided in the facility for storing carbon dioxide. The amount of carbon dioxide used in synthesis is small compared to the amount of carbon dioxide injected. If a carbon dioxide capture device (20) dedicated to a facility for utilizing carbon dioxide to produce a synthetic product (for example, a synthesis plant 10 configured to produce a synthetic product) is provided for such a small amount of carbon dioxide, the facility cost increases. As a result, the unit price of the synthetic product also increases. In this regard, in the configuration described in (1) above, the synthesis plant (10) utilizes the carbon dioxide captured by the capture and storage plant (3), so a carbon dioxide capture device (20) dedicated to the synthesis plant (10) is not required.

[0030] (2) In some embodiments, in the configuration described in (1) above, The pressure-injection equipment (30) includes at least one compressor (e.g., any one of compressors 31, 32, and 33), The carbon dioxide supply line (11) is connected downstream of the at least one compressor (for example, any one of compressors 31, 32, and 33) and supplies the compressed carbon dioxide to the synthesis plant (10).

[0031] Providing carbon dioxide compressors (31, 32, 33) dedicated to the synthesis plant (10) for a small amount of carbon dioxide increases the facility cost. In this regard, according to the configuration described in (2) above, the synthesis plant uses carbon dioxide compressed by a compressor (e.g., compressors 31, 32, 33) of the injection facility (30), making it possible to eliminate the need for carbon dioxide compressors (31, 32, 33) dedicated to the synthesis plant (10).

[0032] (3) In some embodiments, in the configuration described in (1) above, The pressure-injection equipment (30) includes a plurality of compressors (e.g., compressors 31, 32, and 33) connected in series, The carbon dioxide supply line (11) is connected to the carbon dioxide flow path in the injection facility (30) and supplies the carbon dioxide compressed by one or more of the compressors (e.g., one or more of compressors 31, 32, 33) to the synthesis plant (10).

[0033] Providing carbon dioxide compressors (31, 32, 33) dedicated to the synthesis plant (10) for a small amount of carbon dioxide increases the facility cost. In this regard, according to the configuration described in (3) above, the synthesis plant uses carbon dioxide compressed by a compressor (e.g., compressors 31, 32, 33) of the injection facility (30), making it possible to eliminate the need for carbon dioxide compressors (31, 32, 33) dedicated to the synthesis plant (10).

[0034] In the configuration described in (3) above, the injection facility (30) is configured so that a plurality of compressors (e.g., compressors 31, 32, 33) perform compression in multiple stages. By selecting a position in the flow path of carbon dioxide where the carbon dioxide has an appropriate pressure after or during compression by these compressors (e.g., compressors 31, 32, 33) and connecting the carbon dioxide supply line (11), it becomes possible to supply carbon dioxide compressed to a pressure appropriate for producing a synthetic product to the synthesis plant (10).

[0035] (4) In some embodiments, in the configuration described in (2) or (3) above, the synthetic product production system (2) a feed compressor (14) located upstream of the synthesis plant (10) for compressing the hydrogen-containing gas; The carbon dioxide supply line (11) is connected to a position downstream of the feed compressor (14) and upstream of the synthesis plant (10).

[0036] According to the configuration described in (4) above, even if a compressor for compressing carbon dioxide to be used in the synthesis is not provided upstream of the synthesis plant (10), a mixture containing compressed carbon dioxide and hydrogen can be supplied to the synthesis plant (10).

[0037] (5) In some embodiments, in the configuration described in any one of (1) to (4) above, a sensor (51) for detecting the amount of hydrogen-containing gas supplied; a control device (52) configured to output a command in response to the supply amount of hydrogen-containing gas detected by the sensor (51); a flow rate adjusting device (53) provided in the carbon dioxide supply line (11) and configured to adjust the amount of carbon dioxide supplied to the synthesis plant (10) in response to the command from the control device (52); Equipped with.

[0038] Because the amount of carbon dioxide emitted is enormous, the amount of carbon dioxide recovered may be large, while the amount of hydrogen-containing gas supplied may be small. Furthermore, if the hydrogen-containing gas is by-product hydrogen discharged as a by-product from another plant or gas generated by water electrolysis using renewable energy, the amount of hydrogen-containing gas supplied may fluctuate. In such cases, the amount of synthetic product produced by the synthesis plant (10) depends on the amount of hydrogen-containing gas supplied, resulting in a surplus of carbon dioxide recovered. In this regard, the configuration described in (5) above makes it possible to supply the synthesis plant (10) with the amount of carbon dioxide necessary to produce the synthetic product according to the amount of hydrogen-containing gas supplied, and to adjust the flow rate of carbon dioxide so that unnecessary carbon dioxide is injected. This improves the operability of the system, and even if surplus recovered carbon dioxide is generated, it is possible to prevent it from being released into the atmosphere.

[0039] (6) In some embodiments, in the configuration described in any one of (1) to (5) above, the synthesis plant (10) produces at least one of methanol, methane, and dimethyl ether as the synthesis product.

[0040] The configuration described in (6) above is advantageous because it produces a compound that has better shelf life than hydrogen gas.

[0041] (7) A carbon dioxide treatment system (1) according to an embodiment of the present disclosure includes: A synthetic product production system (2) according to any one of (1) to (6) above; a capture and storage plant (3) including a capture device (20) for capturing carbon dioxide from a carbon dioxide-containing gas and an injection facility (30) for immobilizing the captured carbon dioxide in a geological formation; a power generation facility (40) configured to generate electricity by combusting the off-gas from the recovery device (20) of the recovery and storage plant (3); an unreacted gas supply line (19) for supplying at least a portion of the unreacted gas from a pipe for recirculating the discharged unreacted gas to the power generation facility (40); Equipped with.

[0042] Since it is difficult to react all of the supplied carbon dioxide and hydrogen at once, the synthesis plant (10) is usually provided with a pipe for recirculating the unreacted gas. However, if the unreacted gas is recirculated, inert gases will accumulate in the unreacted gas, reducing the reaction efficiency, so it is necessary to remove some of the unreacted gas from the system. According to the configuration described in (7) above, the unreacted gas is removed from this pipe and combustible components, such as methane, contained in the unreacted gas are supplied as fuel for the power generation equipment, thereby improving the energy efficiency of the entire system.

[0043] (8) In some embodiments, in the configuration described in (7) above, the carbon dioxide treatment system (2) includes a purge line (63) through which a replacement gas is injected during shutdown of the synthesis plant (10), and the unreacted gas supply line (19) is connected to the purge line (63).

[0044] In a configuration in which a replacement gas (e.g., an inert gas) is injected during shutdown of the synthesis plant (10) and the replacement gas is purged with a hydrogen-containing gas upon subsequent restart, a mixture of the hydrogen-containing gas and the replacement gas is usually exhausted. In contrast, in the configuration described in (8) above, such a mixture is also used as fuel without being discarded, thereby improving the energy efficiency of the entire system. [Explanation of symbols]

[0045] 1. Carbon dioxide treatment system 2. Synthetic Production System 3. Capture and storage plant 10. Synthesis Plant 11 Carbon dioxide supply line 12,13 Purification equipment 14 Raw material supply compressor 15,31 Compressor 16 Catalyst 17 Gas-liquid separation equipment 18 Distillation apparatus 19 Unreacted gas supply line 20 Recovery Device 30 Press-in equipment 40 Power generation facilities 51 Sensors 52 Control device 53 Flow rate adjustment device 61,62 Valve 63 Purge Line

Claims

1. a synthesis unit (CCU) for producing a synthetic product by synthesizing a hydrogen-containing gas and carbon dioxide; a carbon dioxide supply line for extracting a portion of the carbon dioxide from a capture and storage plant including a capture device for capturing the carbon dioxide from a carbon dioxide-containing gas and an injection facility for immobilizing the captured carbon dioxide in a geological layer and supplying the carbon dioxide to the synthesis plant; Equipped with the injection equipment includes a compressor; The carbon dioxide supply line is connected downstream of the compressor and supplies the portion of the carbon dioxide compressed by the compressor to the synthesis plant. A synthetic production system.

2. The injection facility includes a plurality of compressors connected in series; The carbon dioxide supply line is connected to a flow path of the carbon dioxide in the injection facility, and supplies the portion of the carbon dioxide compressed by the at least one compressor of the plurality of compressors to the synthesis plant. The composite production system of claim 1 .

3. a feed compressor for compressing the hydrogen-containing gas at a position upstream of the synthesis plant; The carbon dioxide supply line is connected to a location downstream of the feed compressor and upstream of the synthesis plant.

3. The synthetic product production system according to claim 1 or 2.

4. a sensor for detecting the supply amount of the hydrogen-containing gas; a control device configured to output a command in accordance with the supply amount of hydrogen-containing gas detected by the sensor; a flow rate adjusting device provided in the carbon dioxide supply line and configured to adjust the amount of the portion of the carbon dioxide supplied to the synthesis plant in response to the command from the control device; 4. The composite production system according to claim 1, further comprising:

5. The synthesis plant produces at least one of methanol, methane, and dimethyl ether as the synthesis product. A composite production system according to any one of claims 1 to 4.

6. a capture and storage plant including a capture device for capturing carbon dioxide from a carbon dioxide-containing gas and an injection facility for immobilizing the captured carbon dioxide in a geological formation; a synthesis plant for producing a synthesis product from the hydrogen-containing gas and the carbon dioxide; a carbon dioxide supply line for extracting a portion of the carbon dioxide from the capture and storage plant and supplying it to the synthesis plant; a power generation facility configured to generate electricity by combusting off-gas generated from the capture device of the capture and storage plant; an unreacted gas supply line for extracting at least a portion of the unreacted gas discharged from the synthesis plant through a pipe in the synthesis plant for recirculating the unreacted gas and supplying the extracted unreacted gas to the power generation facility; Equipped with The carbon dioxide treatment system is configured such that the power generation facility uses, as fuel, the off-gas from the recovery device and combustible components contained in at least a portion of the unreacted gas supplied from the synthesis plant via the unreacted gas supply line.

7. a purge line into which a replacement gas is injected during shutdown of the synthesis plant; The unreacted gas supply line is connected to the purge line. The carbon dioxide processing system of claim 6 .

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