JP2020189817A - Synthetic production system and synthetic production method - Google Patents

Abstract

To provide a synthetic production system and a synthetic production method, which can produce a synthetic by utilizing byproduct hydrogen.SOLUTION: A synthetic production system includes a byproduct hydrogen discharge plant that discharges byproduct hydrogen, a carbon dioxide discharge plant that discharges carbon dioxide-containing gas, a synthesis plant that produces a synthetic by synthesizing the byproduct hydrogen and carbon dioxide contained in the carbon dioxide-containing gas, and a flow rate control apparatus constituted such that carbon dioxide of which flow rate is controlled is lead to a flow rate of the byproduct hydrogen supplied to the synthesis plant.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a compound production system and a compound production method for producing a compound.

In order to reduce carbon dioxide emissions associated with the use of fossil fuels, it is necessary to pursue all technical options. If carbon dioxide can be recovered from carbon dioxide-containing gas and used as a resource for synthetic products (fuel, chemical materials, etc.), it will be possible to economically and rationally suppress the emission of carbon dioxide into the atmosphere.

As a proposal for the utilization of carbon dioxide, for example, Patent Document 1 describes a system for producing fuel by synthesizing hydrogen obtained by electrolysis of water or seawater and carbon dioxide separated from the exhaust gas of a power generation device. Is disclosed.

Japanese Unexamined Patent Publication No. 11-46460

When hydrogen is produced by electrolyzing water or seawater exclusively for use in the production of a synthetic product as in Patent Document 1, the acquisition cost of hydrogen is high, so that the production cost of the synthetic product is high. .. On the other hand, when the by-product hydrogen, which is hydrogen generated as a by-product of the treatment different from the treatment for producing the compound, is utilized, the acquisition cost of hydrogen is low, so that the production cost of the compound is low. Become.

In view of the above circumstances, at least one embodiment of the present invention aims to provide a compound production system and a compound production method capable of producing a compound using by-product hydrogen.

(1) The compound production system according to at least one embodiment of the present invention is
A by-product hydrogen discharge plant that discharges by-product hydrogen and
A carbon dioxide emission plant that emits carbon dioxide-containing gas,
A synthesis plant that produces a composite by synthesizing the by-product hydrogen and carbon dioxide contained in the carbon dioxide-containing gas, and
A flow rate adjusting device configured to guide the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant.
To be equipped.

In the configuration of (1) above, a composite is produced by using the carbon dioxide-containing gas discharged from the carbon dioxide emitting plant and the by-product hydrogen discharged from the by-product hydrogen discharging plant. In this case, since the hydrogen acquisition cost is low, the production cost of the compound can be low.

By the way, when producing a high-purity synthetic product such as fuel or chemical material, it is necessary to adjust the supply amount of carbon dioxide and hydrogen so as to be a ratio based on the chemical reaction formula in the synthesis. In the case of electrolysis, the amount of hydrogen generated can be adjusted, so the ratio of the amount of carbon dioxide to the amount of hydrogen supplied can be adjusted by adjusting the amount of hydrogen generated according to the supply status of carbon dioxide. However, when by-product hydrogen is used, it is difficult to adjust the amount of hydrogen generated or supplied. Further, when the amount of hydrogen emitted is smaller than the amount of carbon dioxide emitted, it is preferable that the hydrogen utilization rate is high in order to maximize the production amount of the compound.

In this respect, in the configuration of (1) above, the flow rate adjusting device is configured to guide carbon dioxide whose flow rate is adjusted with respect to the flow rate of by-product hydrogen supplied to the synthesis plant to the synthesis plant. In this case, since the amount of carbon dioxide supplied is adjusted according to the amount of by-product hydrogen supplied, it is possible to increase the hydrogen utilization rate.

(2) In some embodiments, in the configuration of (1) above,
The flow rate adjusting device is
A carbon dioxide recovery device that recovers the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant,
A recovery amount adjusting unit configured to control the recovery amount of the carbon dioxide of the carbon dioxide recovery device,
including.

According to the configuration of (2) above, the carbon dioxide is controlled to be recovered from the carbon dioxide-containing gas according to the amount of hydrogen generated or supplied so as not to recover an unnecessary amount of carbon dioxide. It becomes possible to. As a result, the cost for recovering high-purity carbon dioxide from the carbon dioxide-containing gas can be reduced.

(3) In some embodiments, in the configuration of (1) or (2) above, the compound production system
A by-product hydrogen storage device for accumulating the by-product hydrogen discharged from the by-product hydrogen discharge plant is provided.
The by-product hydrogen storage device can supply the by-product hydrogen to the synthesis plant.

According to the configuration of (3) above, it is possible to stably supply by-product hydrogen to the synthesis plant. For example, even if the amount of by-product hydrogen discharged from the by-product hydrogen discharge plant fluctuates to the extent that it deviates from the range corresponding to the adjustable range of the carbon dioxide flow rate led by the flow rate regulator to the synthesis plant, by-product hydrogen By utilizing the storage device, by-product hydrogen within the adjustable range of carbon dioxide flow rate can be supplied to the synthesis plant. As a result, the operating rate of the synthesis plant can be improved.

(4) In some embodiments, in the configuration of (3) above, the compound production system is
A first supply line for supplying the by-product hydrogen discharged from the by-product hydrogen discharge plant to the synthesis plant is provided.
The by-product hydrogen storage device is provided in the first supply branch line branched from the first supply line.

According to the configuration of (4) above, since the by-product hydrogen storage device is provided in the first supply branch line branched from the first supply line, the by-product hydrogen is not passed through the by-product hydrogen storage device. It can also be supplied to the synthesis plant from one supply line. In this case, even when the synthesis plant is in operation, it is possible to maintain the by-product hydrogen storage device by disconnecting the connection between the by-product hydrogen storage device and the first supply line. As a result, the operating rate of the synthesis plant can be improved.

(5) In some embodiments, in the configuration of (3) or (4) above,
The flow rate adjusting device is configured to control the flow rate of carbon dioxide according to the remaining amount of the by-product hydrogen storage device.

According to the configuration of (5) above, for example, when the remaining amount of the by-product hydrogen storage device (that is, the stored amount of by-product hydrogen) falls below the threshold value indicating the insufficient remaining amount (for example, 10% of the rating), carbon dioxide is used. Control to reduce the flow rate of hydrogen to less than usual, and increase the flow rate of carbon dioxide when the remaining amount of the by-product hydrogen storage device exceeds the threshold (for example, 90% of the rating) indicating that the capacity is over. It becomes possible to perform control and the like. Therefore, it is possible to reduce the possibility that the remaining amount of the by-product hydrogen storage device becomes excessively low or excessive.

(6) In some embodiments, in any one of the above configurations (1) to (5), the composite production system is:
A carbon dioxide storage device for accumulating the carbon dioxide is provided.
The carbon dioxide storage device is configured to be able to supply the carbon dioxide to the synthesis plant.

According to the configuration of (6) above, it is possible to stably supply carbon dioxide to the synthesis plant. For example, even if the amount of by-product hydrogen emitted from the by-product hydrogen discharge plant fluctuates to the extent that it deviates from the range corresponding to the adjustable range of carbon dioxide recovery amount, by using the carbon dioxide storage device, Carbon dioxide close to the amount of carbon dioxide corresponding to the amount of by-product hydrogen can be supplied to the synthesis plant. As a result, the operating rate of the synthesis plant can be improved.

(7) In some embodiments, in the configuration of (6) above, the compound production system is
A second supply line for supplying the carbon dioxide contained in the carbon dioxide-containing gas discharged from the carbon dioxide emission plant to the synthesis plant is provided.
The carbon dioxide storage device is provided in a second supply branch line branched from the second supply line.

According to the configuration of (7) above, since the carbon dioxide storage device is provided in the second supply branch line branched from the second supply line, carbon dioxide is supplied to the second supply line without going through the carbon dioxide storage device. It can also be supplied to the synthesis plant from. In this case, even when the synthesis plant is in operation, it is possible to maintain the carbon dioxide storage device by disconnecting the connection between the carbon dioxide storage device and the second supply line. As a result, the operating rate of the synthesis plant can be improved.

(8) In some embodiments, in the configuration of (6) or (7) above,
The flow rate adjusting device is
A carbon dioxide capture device that recovers the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant and supplies the carbon dioxide to the carbon dioxide storage device and the synthesis plant.
A recovery amount adjusting unit configured to control the recovery amount of the carbon dioxide of the carbon dioxide recovery device, and
Including
The flow rate adjusting device is configured to control the amount of carbon dioxide recovered according to the remaining amount of the carbon dioxide storage device.

According to the configuration of (8) above, for example, when the remaining amount of the carbon dioxide storage device (that is, the stored amount of carbon dioxide) falls below the threshold value indicating the insufficient remaining amount (for example, 10% of the rating), carbon dioxide is recovered. Control to reduce the amount of carbon dioxide than usual, control to increase the amount of carbon dioxide recovered when the remaining amount of the carbon dioxide storage device exceeds the threshold (for example, 90% of the rating) indicating that the capacity is over. Etc. can be performed. Therefore, it is possible to reduce the possibility that the remaining amount of the carbon dioxide storage device becomes excessively low or excessive.

(9) In some embodiments, in any one of the above (1) to (8) configurations.
The by-product hydrogen discharge plant is a plant that produces caustic soda, and produces the by-product hydrogen in salt electrolysis for producing the caustic soda.

The carbon dioxide and hydrogen supplied to the synthesis plant need to be highly purified. When impurities are contained in the by-product hydrogen, for example, the reaction rate or the reaction rate at the time of producing the synthetic product may decrease, which may hinder the production of the synthetic product. In this respect, according to the configuration of (9) above, since the by-product hydrogen discharge plant discharges high-purity by-product hydrogen, the cost required for the hydrogen purification process can be reduced.

(10) In some embodiments, in any one of the above (1) to (9), at least a part of the generated power of the carbon dioxide emission plant is transferred to the by-product hydrogen emission plant or the synthesis plant. Supply.

According to the configuration of (10) above, the efficiency of energy utilization can be improved by supplying at least a part of the generated power of the carbon dioxide emission plant to the by-product hydrogen emission plant or the synthesis plant.

(11) In some embodiments, the exhaust heat of the carbon dioxide emission plant is supplied to the synthesis plant in any one of the configurations (1) to (10).

According to the configuration of (11) above, the efficiency of energy utilization can be improved by utilizing the exhaust heat of the carbon dioxide emitting plant in the synthesis plant.

(12) In some embodiments, in any one of the above configurations (1) to (11),
The exhaust heat of the carbon dioxide emission plant is used for heating in the synthesis plant to react the carbon dioxide with the by-product hydrogen.

According to the configuration of (12) above, since the synthesis plant uses the exhaust heat of the carbon dioxide emission plant for heating for reacting carbon dioxide and by-product hydrogen in the synthesis plant, the efficiency of energy utilization should be improved. Can be done.

(13) In some embodiments, in any one of the configurations (1) to (11) above, the exhaust heat of the carbon dioxide emitting plant purifies the final product from the compound of the synthesis plant. Used in heating for.

According to the configuration of (13) above, since the synthesis plant uses the exhaust heat of the carbon dioxide emission plant for heating for purifying the final product from the synthesis, it is possible to improve the efficiency of energy utilization.

(14) In some embodiments, in any one of the above configurations (1) to (13), the by-product hydrogen discharge plant uses pure water supplied from the carbon dioxide discharge plant to use caustic soda. To generate.

According to the configuration of (14) above, since the by-product hydrogen discharge plant and the carbon dioxide discharge plant share pure water, the equipment for supplying pure water can be simplified.

(15) In some embodiments, in any one of the above configurations (1) to (14), the compound production system is configured to remove impurities in raw water to produce pure water. A pure water supply device for supplying the pure water to the by-product hydrogen discharge plant and the carbon dioxide discharge plant is provided.

In the configuration of (15) above, since the composite production system, the by-product hydrogen discharge plant, and the carbon dioxide discharge plant share the pure water supply device, the equipment for supplying pure water can be simplified.

(16) In some embodiments, in any one of the above (1) to (8) configurations.
The carbon dioxide emission plant emits the carbon dioxide-containing gas obtained by reforming naphtha.
The by-product hydrogen discharge plant discharges by-product hydrogen obtained by performing hydrogen purification on the hydrogen-containing gas obtained from the carbon dioxide-containing gas discharged by the carbon dioxide discharge plant.

The configuration of (16) above can be applied to refineries.

(17) In some embodiments, in the configuration of (16) above, the compound production system
A carbon dioxide recovery device for recovering the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant is provided.
The by-product hydrogen discharge plant performs hydrogen purification on the hydrogen-containing gas after the carbon dioxide recovery device recovers the carbon dioxide.

In the configuration of (17) above, the by-product hydrogen discharge plant performs hydrogen purification on the hydrogen-containing gas (carbon dioxide lean gas) after recovering carbon dioxide, so that by-product hydrogen can be efficiently obtained. .. Further, since the volume processed by the by-product hydrogen discharge plant is smaller than that in the case of processing carbon dioxide-containing gas (carbon dioxide-rich gas), the by-product hydrogen discharge plant can be miniaturized (reduced in capacity).

(18) In some embodiments, in the configuration of (16) above, the compound production system
A carbon dioxide recovery device for recovering the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant is provided.
The by-product hydrogen discharge plant includes a hydrogen purification device provided on a flow path through which the carbon dioxide-containing gas flows from the carbon dioxide discharge plant to the carbon dioxide capture device.

In the configuration of (18) above, the carbon dioxide recovery device recovers carbon dioxide from the carbon dioxide-containing gas (hydrogen lean gas) after the by-product hydrogen discharge plant has refined hydrogen, so that the carbon dioxide is efficiently recovered. be able to. In addition, since the volume processed by the carbon dioxide recovery device is smaller than that when carbon dioxide is recovered from the carbon dioxide-containing gas (hydrogen-rich gas) before hydrogen purification, the carbon dioxide recovery device is downsized (small capacity). Can be).

(19) In some embodiments, in the configuration of (17) or (18) above,
By controlling the recovery rate of the carbon dioxide recovery device, the flow rate adjusting device guides the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant. It is configured as follows.

In the configuration of (19) above, for example, if the carbon dioxide recovery rate is controlled based on the amount of carbon dioxide required when producing a compound with the hydrogen recovery rate set to 100%, the carbon dioxide emission plant emits carbon dioxide. Even when the composition of the carbon dioxide-containing gas is changed, the hydrogen recovery rate can be fixed at 100%.

(20) In some embodiments, in the configuration of (16) above, the compound production system
A carbon dioxide recovery device that recovers the carbon dioxide from the carbon dioxide-containing gas,
At least one valve for adjusting the flow rate ratio between the mainstream line connected to the carbon capture device and the bypass line bypassing the carbon capture device.
To be equipped.

In the configuration (20) above, the volume of the carbon dioxide-containing gas processed by the carbon dioxide recovery device can be reduced by adjusting the flow rate ratio between the mainstream line and the bypass line, so that the carbon dioxide recovery device can be miniaturized (small). Capacity can be increased).

(21) In some embodiments, in the configuration of (20) above,
The flow rate adjusting device is configured to guide the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant by controlling the flow rate ratio. There is.

In the configuration of the above (21), for example, the carbon dioxide recovery rate and the hydrogen recovery rate can be fixed by controlling the flow rate ratio.

(22) In some embodiments, in any one of the above configurations (1) to (21),
The synthesis plant produces at least one of methanol, methane, and dimethyl ether as the synthesis.

According to the configuration (22) above, it is possible to produce a compound having excellent storage stability as compared with hydrogen gas.

(23) The compound production method according to at least one embodiment of the present invention is
By-product hydrogen discharge step to discharge by-product hydrogen and
A carbon dioxide emission step that emits carbon dioxide-containing gas,
A compound production step of producing a compound by synthesizing the by-product hydrogen and carbon dioxide contained in the carbon dioxide-containing gas, and
A flow rate at which a part of the carbon dioxide emitted in the carbon dioxide emission step is extracted and the flow rate is adjusted with respect to the flow rate of the by-product hydrogen used in the compound production step to lead the carbon dioxide to synthesis. Adjustment steps and
To be equipped.

According to the method (23) above, a composite is produced using the carbon dioxide-containing gas emitted in the carbon dioxide emission step and the by-product hydrogen emitted in the by-product hydrogen emission step. In this case, since the acquisition cost of hydrogen is low, the production cost of the composite can be lowered. Further, in the flow rate adjusting step, carbon dioxide whose flow rate is adjusted with respect to the flow rate of by-product hydrogen used in the compound production step is guided to synthesis. In this case, since the amount of carbon dioxide supplied is adjusted according to the amount of by-product hydrogen supplied, it is possible to increase the hydrogen utilization rate.

According to at least one embodiment of the present invention, it is possible to provide a synthetic product production system and a synthetic product production method capable of producing a synthetic product using by-product hydrogen.

It is a figure which shows roughly the structure of the synthetic product production system which concerns on one Embodiment of this invention. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the synthesis plant which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a figure which shows roughly the structure of the compound production system which concerns on one Embodiment. It is a flowchart which shows the synthetic product production method which concerns on one Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. Absent.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the state of existence.
For example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or chamfering within a range in which the same effect can be obtained. The shape including the part and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

1 to 9 and 11 to 14 show the compound production system 100 (100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I, 100J, 100K, respectively, according to the embodiment of the present invention. , 100L, 100M) is a diagram schematically showing the configuration. The compound production system 100 is a system for producing a compound such as a fuel or a chemical material. For example, the synthetic product is methanol, methane, dimethyl ether (DME) and the like.

In some embodiments, for example, as shown in FIGS. 1-9 and 11-14, the composite production system 100 comprises a by-product hydrogen discharge plant 10 that discharges by-product hydrogen and a carbon dioxide-containing gas. A carbon dioxide emission plant 20 that emits carbon dioxide, a synthesis plant 30 that produces a composite by synthesizing by-product hydrogen and carbon dioxide contained in a carbon dioxide-containing gas, and a by-product hydrogen supplied to the synthesis plant 30. A flow rate adjusting device 40 configured to guide carbon dioxide whose flow rate has been adjusted with respect to the flow rate to the synthesis plant 30 is provided.

According to such a configuration, the compound production system 100 produces a compound by using the carbon dioxide-containing gas emitted from the carbon dioxide emission plant 20 and the by-product hydrogen emitted from the by-product hydrogen emission plant 10. To do. In this case, since the hydrogen acquisition cost is low, the production cost of the compound can be low.

Further, the flow rate adjusting device 40 is configured to guide carbon dioxide whose flow rate is adjusted with respect to the flow rate of by-product hydrogen supplied to the synthesis plant 30 to the synthesis plant 30. In this case, since the amount of carbon dioxide supplied is adjusted according to the amount of by-product hydrogen supplied, it is possible to increase the hydrogen utilization rate.

In some embodiments, for example, as shown in FIGS. 1-9 and 11-14, the flow control device 40 recovers carbon dioxide from the carbon dioxide-containing gas emitted from the carbon dioxide emission plant 20. It includes a carbon dioxide capture device 42 and a recovery amount adjusting unit 41 configured to control the carbon dioxide recovery amount of the carbon dioxide recovery device 42. The flow rate adjusting device 40 is, for example, a sensor (not shown) for measuring the hydrogen flow rate of the supply pipe to the synthesis plant 30 and a by-product hydrogen storage device in order to adjust the flow rate of carbon dioxide with respect to the flow rate of by-product hydrogen. A sensor (not shown) for measuring the remaining amount of 50 may be provided.

The carbon dioxide recovery device 42 may be configured to separate and recover carbon dioxide by, for example, a PSA (Pressure Swing Adsorption) method, or may be configured to separate and recover carbon dioxide by an amine absorption method. In the recovery method by the PSA method, for example, the amount of carbon dioxide recovered or the recovery rate is adjusted by repeating pressurization and depressurization. In the recovery method by the amine absorption method, the recovery amount or recovery rate of carbon dioxide is adjusted by adjusting the flow rate of the absorption liquid.

The recovery amount adjusting unit 41 may be configured to adjust the recovery rate of the carbon dioxide recovery device 42, and is not the recovery rate but the amount of carbon dioxide-containing gas led to the carbon dioxide recovery device 42 and the carbon dioxide recovery device. The configuration may be such that the amount of carbon dioxide-containing gas released to the outside without being guided to 42 is adjusted. Therefore, the exhaust gas of the carbon dioxide recovery device 42 may contain a carbon dioxide-containing gas that is released to the outside without being guided to the carbon dioxide recovery device 42, or the carbon dioxide-containing gas guided to the carbon dioxide recovery device 42. Of these, off-gas may be used after carbon dioxide is recovered.

According to such a configuration, it is controlled to recover carbon dioxide from the carbon dioxide-containing gas according to the amount of hydrogen generated or supplied so as not to recover an unnecessary amount of carbon dioxide. It becomes possible. As a result, the cost for recovering high-purity carbon dioxide from the carbon dioxide-containing gas can be reduced.

In some embodiments, for example, as shown in FIGS. 1-6 and 9, the composite production system 100 is a by-product hydrogen for accumulating the by-product hydrogen discharged from the by-product hydrogen discharge plant 10. A storage device 50 may be provided so that the by-product hydrogen storage device 50 can supply by-product hydrogen to the synthesis plant 30. The by-product hydrogen storage device 50 is a device for storing hydrogen, for example, a hydrogen storage alloy, a storage tank, or the like.

According to such a configuration, it is possible to stably supply by-product hydrogen to the synthesis plant 30. For example, even if the amount of by-product hydrogen discharged from the by-product hydrogen discharge plant 10 fluctuates so as to deviate from the range corresponding to the adjustable range of the carbon dioxide flow rate led by the flow rate adjusting device 40 to the synthesis plant 30. By using the by-product hydrogen storage device 50, by-product hydrogen within the adjustable range of the flow rate of carbon dioxide can be supplied to the synthesis plant 30. As a result, the operating rate of the synthesis plant 30 can be improved.

In some embodiments, for example, as shown in FIG. 2, the composite production system 100 provides a first supply line for supplying the by-product hydrogen discharged from the by-product hydrogen discharge plant 10 to the synthesis plant 30. The by-product hydrogen storage device 50 may be provided in the first supply branch line branched from the first supply line. In FIG. 2, the supply path from the by-product hydrogen storage device 50 to the synthesis plant 30 is another supply line provided in parallel with the first supply line. However, the supply route from the by-product hydrogen storage device 50 to the synthesis plant 30 may be the first supply line. That is, the by-product hydrogen storage device 50 may have a configuration in which the by-product hydrogen is supplied to the first supply line or the by-product hydrogen is supplied from the first supply line.

According to such a configuration, since the by-product hydrogen storage device 50 is provided in the first supply branch line branched from the first supply line, the by-product hydrogen is not passed through the by-product hydrogen storage device 50. It is also possible to supply to the synthesis plant 30 from one supply line. In this case, even when the synthesis plant 30 is in operation, it is possible to maintain the by-product hydrogen storage device 50 by disconnecting the connection between the by-product hydrogen storage device 50 and the first supply line. As a result, the operating rate of the synthesis plant 30 can be improved.

In some embodiments, for example, the flow rate adjusting device 40 shown in FIGS. 1 to 6 and 9 is configured to control the flow rate of carbon dioxide according to the remaining amount of the by-product hydrogen storage device 50. May be good.

According to such a configuration, for example, when the remaining amount of the by-product hydrogen storage device 50 (that is, the stored amount of by-product hydrogen) falls below the threshold value indicating the insufficient remaining amount (for example, 10% of the rating), the flow rate of carbon dioxide is reduced. Control to make it less than usual, control to make the flow rate of carbon dioxide higher than usual when the remaining amount of the by-product hydrogen storage device 50 exceeds the threshold (for example, 90% of the rating) indicating that the capacity is over. Can be done. Therefore, it is possible to reduce the possibility that the remaining amount of the by-product hydrogen storage device 50 becomes excessively small or excessive.

In some embodiments, for example, as shown in FIGS. 1 and 2, the composite production system 100 comprises a carbon dioxide storage device 60 for storing carbon dioxide, from the carbon dioxide storage device 60 to the synthesis plant 30. It is configured to be able to supply carbon dioxide. The carbon dioxide storage device 60 is a device for storing carbon dioxide, for example, a storage tank.

According to such a configuration, carbon dioxide can be stably supplied to the synthesis plant 30. For example, even if the amount of by-product hydrogen discharged from the by-product hydrogen discharge plant 10 fluctuates to the extent that it deviates from the range corresponding to the adjustable range of the carbon dioxide recovery amount, the carbon dioxide storage device 60 can be used. Therefore, carbon dioxide close to the amount of carbon dioxide corresponding to the amount of by-product hydrogen can be supplied to the synthesis plant 30. As a result, the operating rate of the synthesis plant 30 can be improved.

In some embodiments, for example, as shown in FIG. 2, the composite production system 100 supplies carbon dioxide contained in the carbon dioxide-containing gas emitted from the carbon dioxide emission plant 20 to the synthesis plant 30. A second supply line is provided, and the carbon dioxide storage device 60 may be provided in the second supply branch line branched from the second supply line. In FIG. 2, the supply path from the carbon dioxide storage device 60 to the synthesis plant 30 is another supply line provided in parallel with the second supply line. However, the supply route from the carbon dioxide storage device 60 to the synthesis plant 30 may be the second supply line. That is, the carbon dioxide storage device 60 may have a configuration in which carbon dioxide is supplied to the second supply line or carbon dioxide is supplied from the second supply line.

According to this configuration, since the carbon dioxide storage device 60 is provided in the second supply branch line branched from the second supply line, carbon dioxide is synthesized from the second supply line without going through the carbon dioxide storage device 60. It can also be supplied to the plant 30. In this case, even when the synthesis plant 30 is in operation, it is possible to maintain the carbon dioxide storage device 60 by disconnecting the connection between the carbon dioxide storage device 60 and the second supply line. As a result, the operating rate of the synthesis plant can be improved.

The flow control device 40 shown in FIGS. 1 and 2 recovers carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant 20 and supplies carbon dioxide to the carbon dioxide storage device 60 and the synthesis plant 30. It includes a carbon capture device 42 and a recovery amount adjusting unit 41 configured to control the carbon dioxide recovery amount of the carbon dioxide recovery device 42. In some embodiments, in such a configuration, the flow rate regulator 40 may be configured to control the amount of carbon dioxide recovered according to the remaining amount of the carbon dioxide storage device 60. Further, the flow rate adjusting device 40 includes a sensor (not shown) for measuring the remaining amount of the carbon dioxide storage device 60, a supply amount of carbon dioxide to the carbon dioxide storage device 60, and a supply amount of carbon dioxide from the carbon dioxide storage device 60. A sensor (not shown) or the like for measuring carbon dioxide may be provided.

According to such a configuration, for example, when the remaining amount of the carbon dioxide storage device 60 (that is, the stored amount of carbon dioxide) falls below the threshold value indicating the insufficient remaining amount (for example, 10% of the rating), the amount of carbon dioxide recovered is usually taken. Control to reduce the amount of carbon dioxide, control to increase the amount of carbon dioxide recovered more than usual when the remaining amount of the carbon dioxide storage device 60 exceeds the threshold (for example, 90% of the rating) indicating that the capacity is over. It becomes possible to do. Therefore, it is possible to reduce the possibility that the remaining amount of the carbon dioxide storage device 60 becomes excessively low or excessive.

In some embodiments, the by-product hydrogen discharge plant 10 is a plant that produces caustic soda, such as the by-product hydrogen discharge plant 10 (10A) shown in FIGS. 3 to 6 and 9, for example. It may be configured to produce by-product hydrogen in salt electrolysis for production.

The carbon dioxide and hydrogen supplied to the synthesis plant 30 need to be highly purified. When impurities are contained in the by-product hydrogen, for example, the reaction rate or the reaction rate at the time of producing the synthetic product may decrease, which may hinder the production of the synthetic product. In this respect, according to the above configuration, since the by-product hydrogen discharge plant 10 (10A) discharges high-purity by-product hydrogen, the cost required for the hydrogen purification process can be reduced.

In some embodiments, for example, as shown in FIGS. 3, 4, 7, and 8, at least a part of the generated power of the carbon dioxide emission plant 20 is supplied to the by-product hydrogen emission plant 10 or the synthesis plant 30. doing. In the example shown in FIG. 4, the carbon dioxide emission plant 20 is a cement factory 20 (20B), and at least a part of the generated power of the power generation device 90 using the exhaust heat of the cement factory 20 (20B) is by-product hydrogen. It may be supplied to the discharge plant 10 or the synthesis plant 30. In the examples shown in FIGS. 3, 7 and 8, the carbon dioxide emission plant 20 is a coal-fired power plant 20 (20A), and at least a part of the generated power is supplied to the by-product hydrogen emission plant 10 or the synthesis plant 30. Will be done.

According to such a configuration, the efficiency of energy utilization can be improved by supplying at least a part of the generated power of the carbon dioxide emission plant 20 to the by-product hydrogen emission plant 10 or the synthesis plant 30.

In some embodiments, the composite production system 100 is configured to supply the waste heat of the carbon dioxide emission plant 20 to the synthesis plant 30, as in the composite production system 100 (100I) shown in FIG. 9, for example. It may have been done.

According to such a configuration, the synthesis plant 30 can utilize the exhaust heat of the carbon dioxide emission plant 20 to improve the efficiency of energy utilization.

Here, an example of the configuration of the synthesis plant 30 will be described. FIG. 10 is a diagram schematically showing the configuration of the synthesis plant 30 according to the embodiment. As shown in FIG. 10, the synthesis plant 30 includes a hydrogen purification unit 31 for purifying hydrogen and a carbon dioxide purification unit 32 for purifying carbon dioxide. When high-purity by-product hydrogen and carbon dioxide are supplied, these configurations are unnecessary. Further, the synthesis plant 30 includes a heating unit 33 for heating a gas in which hydrogen and carbon dioxide are mixed, a catalyst 34 for chemically reacting hydrogen and carbon dioxide to produce a composite (methanol), and distillation. A distillation unit 36 configured to perform the above is provided. In addition, the synthesis plant 30 includes a cooling unit 35 for circulating a gas that did not contribute to the production of the composite, a flash tank 37, and a compressor 38.

The hydrogen and carbon dioxide supplied from the hydrogen refining unit 31 and the carbon dioxide refining unit 32 are heated by the heating unit 33 in a mixed state and guided to the catalyst 34. In the catalyst 34, the gas in which hydrogen and carbon dioxide are mixed chemically reacts. This produces a composite. The produced synthetic product is separated into water and the final product (high-purity methanol) by distillation in the distillation unit 36. In such a synthesis plant 30, heating is required in the heating unit 33 and the distillation unit 36.

Therefore, in some embodiments, the exhaust heat of the carbon dioxide emission plant 20 in the compound production system 100 (100I) shown in FIG. 9 is heating for reacting carbon dioxide and by-product hydrogen in the synthesis plant 30 ( That is, it may be used for heating by the heating unit 33 before leading to the catalyst 34).

According to this configuration, since the synthesis plant 30 uses the exhaust heat of the carbon dioxide emission plant 20 for heating for reacting carbon dioxide and by-product hydrogen in the synthesis plant 30, it is possible to improve the efficiency of energy utilization. it can.

Also, in some embodiments, the exhaust heat of the carbon dioxide emission plant 20 in the composition production system 100 (100I) shown in FIG. 9 is heating (ie,) for purifying the final product from the composition of the synthesis plant 30. It is used in the heating required for distillation of the distillation unit 36).

According to such a configuration, since the synthesis plant 30 uses the exhaust heat of the carbon dioxide emission plant 20 for heating for purifying the final product from the synthesis, it is possible to improve the efficiency of energy utilization.

In some embodiments, for example, as shown in FIG. 5, the by-product hydrogen discharge plant 10 (10A) is configured to use pure water supplied from the carbon dioxide discharge plant 20 to produce caustic soda. May be.

According to such a configuration, since the by-product hydrogen discharge plant 10 and the carbon dioxide discharge plant 20 share pure water, the equipment for supplying pure water can be simplified.

Here, in the coal-fired power plant 20 (20A), steam is generated by a boiler and a steam turbine drives a generator. Pure water is used to supply water to this boiler. The coal-fired power plant 20 (20A) is equipped with a pure water supply line (not shown) for replenishing the water supply used in the boiler. In the cement factory 20 (20B), steam is generated by the exhaust heat generated in the cement manufacturing process, and the power generation device 90 is driven by the steam turbine to use the electric power in the factory. Therefore, the cement factory 20 (20B) is provided with a pure water supply line for supplying pure water for generating steam to the steam turbine. As described above, the carbon dioxide emission plant 20 (for example, the coal-fired power plant 20 (20A) and the cement plant 20 (20B)) may be provided with a pure water supply line.

Therefore, in some embodiments, the compound production system 100 may include a pure water supply device 91, for example, as in the compound production system 100 (100F) shown in FIG. The pure water supply device 91 is configured to remove impurities in raw water to produce pure water, and is configured to supply pure water to the by-product hydrogen discharge plant 10 and the carbon dioxide discharge plant 20.

In such a configuration, since the composite production system 100, the by-product hydrogen discharge plant 10, and the carbon dioxide discharge plant 20 share the pure water supply device 91, the equipment for supplying pure water can be simplified. it can.

In some embodiments, the carbon dioxide emission plant 20 (20C) is obtained by modifying naphtha, for example, as in the compound production system 100 (100J, 100K, 100L, 100M) shown in FIGS. 11-14. It may be configured to emit carbon dioxide-containing gas. The carbon dioxide emission plant 20 (20C) has a reformer 94 for reforming naphtha, a PSA device 95 for separating hydrogen from the reformed naphtha by the PSA method, and a PSA off gas of the PSA device 95. Is provided with a three-way valve 96 for dividing the flow into the heating furnace 97 and the flow rate adjusting device 40 (40B), and a heating furnace 97 for performing oil refining. The hydrogen separated by the PSA device 95 is not used in the synthetic product, but is provided as a product to a hydrogen station or the like. The by-product hydrogen discharge plant 10 (10C) is a hydrogen generator, and is a hydrogen-containing gas (carbon dioxide lean gas) obtained from the carbon dioxide-containing gas (carbon dioxide rich gas) discharged by the carbon dioxide discharge plant 20 (20C). On the other hand, it is configured to discharge by-product hydrogen obtained by performing hydrogen purification.

According to such a configuration, it can be applied to refineries. In addition, in FIGS. 11 to 14, the numerical value not represented by the symbol exemplifies the ratio of the gas amount of each flow path to the gas amount of PSA off gas discharged from the PSA device 95 as 100%. .. The composition of PSA off-gas is, for example, 50% by volume of carbon dioxide, 40% by volume of hydrogen, 10% by volume of methane and the like.

In some embodiments, for example, as shown in FIG. 11, the composite production system 100 is a carbon dioxide capture device 42 that recovers carbon dioxide from a carbon dioxide-containing gas emitted from the carbon dioxide emission plant 20 (20C). The by-product hydrogen discharge plant 10 (10C) may be configured such that the carbon dioxide recovery device 42 performs hydrogen purification on the hydrogen-containing gas after the carbon dioxide is recovered.

In such a configuration, the by-product hydrogen discharge plant 10 (10C) performs hydrogen purification on the hydrogen-containing gas (carbon dioxide lean gas) after recovering carbon dioxide, so that by-product hydrogen can be efficiently obtained. Can be done. Further, since the volume processed by the by-product hydrogen discharge plant 10 (10C) is smaller than that when the carbon dioxide-containing gas (carbon dioxide-rich gas) is processed, the by-product hydrogen discharge plant 10 (10C) is downsized (small). Capacity can be increased).

In some embodiments, for example, as shown in FIG. 12, the composite production system 100 is a carbon dioxide capture device 42 that recovers carbon dioxide from a carbon dioxide-containing gas emitted from the carbon dioxide emission plant 20 (20C). The by-product hydrogen discharge plant 10 (10C) includes a hydrogen purification device provided on the flow path through which the carbon dioxide-containing gas flows from the carbon dioxide discharge plant 20 (20C) to the carbon dioxide recovery device 42. Good.

In such a configuration, the carbon dioxide recovery device 42 recovers carbon dioxide from the carbon dioxide-containing gas (hydrogen lean gas) after the by-product hydrogen discharge plant 10 (10C) purifies hydrogen, so that the carbon dioxide is efficient. It can be recovered well. Further, since the volume processed by the carbon dioxide recovery device 42 is smaller than that in the case of recovering carbon dioxide from the carbon dioxide-containing gas (hydrogen-rich gas) before hydrogen purification, the carbon dioxide recovery device 42 is downsized (). Can be reduced in capacity).

In some embodiments, for example, as shown in FIGS. 11 and 12, the flow rate regulator 40 (40A) is supplied to the synthesis plant 30 by controlling the recovery rate of the carbon dioxide capture device 42. It is configured to guide carbon dioxide whose flow rate is adjusted with respect to the flow rate of raw hydrogen to the synthesis plant 30.

In such a configuration, for example, if the carbon dioxide recovery rate is controlled based on the amount of carbon dioxide required when producing a compound with the hydrogen recovery rate set to 100%, the carbon dioxide emission plant 20 (20C) Even when the composition of the carbon dioxide-containing gas emitted by the gas changes, the hydrogen recovery rate can be fixed at 100%.

In some embodiments, for example, as shown in FIGS. 13 and 14, the composite production system 100 is connected to a carbon dioxide capture device 42 that recovers carbon dioxide from a carbon dioxide-containing gas and a carbon dioxide capture device 42. It is provided with at least one valve 43 for adjusting the flow ratio between the mainstream line to be used and the bypass line that bypasses the carbon dioxide capture device 42. At least one valve 43 is one three-way valve in the example shown in FIGS. 13 and 14. The valve 43 may be not a three-way valve but two valves for adjusting the flow rates of the mainstream line and the bypass line.

Specifically, the compound production system 100 (100L) shown in FIG. 13 includes a carbon dioxide recovery device 42 that recovers carbon dioxide from one of the carbon dioxide-containing gases separated by the valve 43, and is a by-product hydrogen discharge plant. In No. 10 (10C), hydrogen purification is performed on the carbon dioxide-containing gas after the carbon dioxide recovery device 42 has recovered the carbon dioxide and the other carbon dioxide-containing gas separated by the valve 43. In this case, since the by-product hydrogen discharge plant 10 performs hydrogen purification on the carbon dioxide-containing gas after the carbon dioxide recovery device 42 has recovered the carbon dioxide and the other carbon dioxide-containing gas separated by the valve 43, By-product hydrogen can be obtained efficiently.

In the compound production system 100 (100M) shown in FIG. 14, the by-product hydrogen discharge plant 10 (10C) purifies the carbon dioxide-containing gas discharged from the carbon dioxide emission plant 20 (20C) with a valve. In 43, the carbon dioxide-containing gas after hydrogen purification by the by-product hydrogen discharge plant 10 (10C) is split into two, and the carbon dioxide recovery device 42 splits one of the carbon dioxide-containing gases separated by the valve 43. We are recovering carbon dioxide from. In this case, the carbon dioxide recovery device 42 recovers carbon dioxide from one of the carbon dioxide-containing gases separated by the valve 43 after the by-product hydrogen discharge plant 10 has refined hydrogen, so that carbon dioxide is efficiently acquired. can do.

According to such a configuration, the volume of the carbon dioxide-containing gas processed by the carbon dioxide recovery device can be reduced by adjusting the flow rate ratio between the mainstream line and the bypass line, so that the carbon dioxide recovery device can be miniaturized (small). Capacity can be increased).

In some embodiments, for example, in FIGS. 13 and 14, the flow rate regulator 40 (40B) has a flow rate relative to the flow rate of by-product hydrogen supplied to the synthesis plant 30 by controlling the flow rate ratio. It may be configured to lead the adjusted carbon dioxide to the synthesis plant 30.

According to such a configuration, for example, by controlling the flow rate ratio, the carbon dioxide recovery rate and the hydrogen recovery rate can be fixed.

In some embodiments, the synthesis plant 30 is configured to produce at least one of methanol, methane, and dimethyl ether as the compound. According to such a configuration, it is possible to produce a compound having excellent storage stability as compared with hydrogen gas.

Hereinafter, a compound production method according to at least one embodiment of the present invention will be described. FIG. 15 is a flowchart showing a compound production method according to an embodiment of the present invention. As shown in FIG. 15, the compound production system 100 discharges by-product hydrogen (step S1). The composite production system 100 emits a carbon dioxide-containing gas (step S2). It should be noted that these steps may be performed at the same time, or there may be a time difference.

The composite production system 100 extracts a part from the carbon dioxide emitted in the carbon dioxide emission step, and synthesizes carbon dioxide whose flow rate is adjusted with respect to the flow rate of by-product hydrogen used in the next step S4. Guide (step S3). The composite product production system 100 produces a composite product by synthesizing by-product hydrogen and carbon dioxide contained in the carbon dioxide-containing gas (step S4).

According to such a method, a compound is produced by using the carbon dioxide-containing gas emitted in the carbon dioxide emission step (step S1) and the by-product hydrogen emitted in the by-product hydrogen emission step (step S2). Produce. In this case, since the hydrogen acquisition cost is low, the production cost of the compound can be low. Further, in the flow rate adjusting step (step S3), carbon dioxide whose flow rate is adjusted with respect to the flow rate of by-product hydrogen used in the compound production step (step S4) is guided to synthesis. In this case, since the amount of carbon dioxide supplied is adjusted according to the amount of by-product hydrogen supplied, it is possible to increase the hydrogen utilization rate.

The present invention is not limited to the above-described embodiment, and includes a modification of the above-described embodiment and a combination of these embodiments as appropriate.

10 By-product hydrogen discharge plant 20 Carbon dioxide discharge plant 20A Coal-fired power plant 20B Cement factory 30 Synthesis plant 31 Hydrogen purification unit 32 Carbon dioxide purification unit 33 Heating unit 34 Catalyst 35 Cooling unit 36 Distillation unit 37 Flash tank 38 Compressor 40 Flow rate Adjustment device 41 Recovery amount adjustment unit 42 Carbon dioxide recovery device 43 Valve 50 By-product hydrogen storage device 60 Carbon dioxide storage device 90 Power generation device 91 Pure water supply device 94 Reformer 95 PSA device 96 Three-way valve 97 Heating furnace 100 Synthesis production system

Claims (23)

A by-product hydrogen discharge plant that discharges by-product hydrogen and
A carbon dioxide emission plant that emits carbon dioxide-containing gas,
A synthesis plant that produces a composite by synthesizing the by-product hydrogen and carbon dioxide contained in the carbon dioxide-containing gas, and
A flow rate adjusting device configured to guide the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant.
A compound production system equipped with. The flow rate adjusting device is
A carbon dioxide recovery device that recovers the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant,
A recovery amount adjusting unit configured to control the recovery amount of the carbon dioxide of the carbon dioxide recovery device,
The compound production system according to claim 1. A by-product hydrogen storage device for accumulating the by-product hydrogen discharged from the by-product hydrogen discharge plant is provided.
The composite production system according to claim 1 or 2, wherein the by-product hydrogen can be supplied from the by-product hydrogen storage device to the synthesis plant. A first supply line for supplying the by-product hydrogen discharged from the by-product hydrogen discharge plant to the synthesis plant is provided.
The compound production system according to claim 3, wherein the by-product hydrogen storage device is provided in a first supply branch line branched from the first supply line. The compound production system according to claim 3 or 4, wherein the flow rate adjusting device is configured to control the flow rate of carbon dioxide according to the remaining amount of the by-product hydrogen storage device. A carbon dioxide storage device for accumulating the carbon dioxide is provided.
The compound production system according to any one of claims 1 to 5, wherein the carbon dioxide can be supplied from the carbon dioxide storage device to the synthesis plant. A second supply line for supplying the carbon dioxide contained in the carbon dioxide-containing gas discharged from the carbon dioxide emission plant to the synthesis plant is provided.
The compound production system according to claim 6, wherein the carbon dioxide storage device is provided in a second supply branch line branched from the second supply line. The flow rate adjusting device is
A carbon dioxide capture device that recovers the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant and supplies the carbon dioxide to the carbon dioxide storage device and the synthesis plant.
A recovery amount adjusting unit configured to control the recovery amount of the carbon dioxide of the carbon dioxide recovery device,
Including
The compound production system according to claim 6 or 7, wherein the flow rate adjusting device is configured to control the recovery amount of the carbon dioxide recovery device according to the remaining amount of the carbon dioxide storage device. The compound production system according to any one of claims 1 to 8, wherein the by-product hydrogen discharge plant is a plant that produces caustic soda, and produces the by-product hydrogen in salt electrolysis for producing the caustic soda. .. The compound production system according to any one of claims 1 to 9, wherein at least a part of the power generated by the carbon dioxide emission plant is supplied to the by-product hydrogen emission plant or the synthesis plant. The compound production system according to any one of claims 1 to 10, wherein the exhaust heat of the carbon dioxide emission plant is supplied to the synthesis plant. The compound production system according to any one of claims 1 to 11, wherein the exhaust heat of the carbon dioxide emission plant is used for heating for reacting the carbon dioxide with the by-product hydrogen in the synthesis plant. .. The compound production system according to any one of claims 1 to 11, wherein the exhaust heat of the carbon dioxide emission plant is used in heating for purifying the final product from the compound of the synthesis plant. The compound production system according to any one of claims 1 to 13, wherein the by-product hydrogen discharge plant uses pure water supplied from the carbon dioxide discharge plant to generate caustic soda. Any of claims 1 to 14, which is configured to remove impurities in raw water to produce pure water and includes a pure water supply device for supplying the pure water to the by-product hydrogen discharge plant and the carbon dioxide discharge plant. The compound production system according to paragraph 1. The carbon dioxide emission plant emits the carbon dioxide-containing gas obtained by reforming naphtha.
The by-product hydrogen discharging plant discharges by-product hydrogen obtained by performing hydrogen purification on the hydrogen-containing gas obtained from the carbon dioxide-containing gas discharged by the carbon dioxide discharging plant according to claims 1 to 8. The compound production system according to any one item. A carbon dioxide recovery device for recovering the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant is provided.
The compound production system according to claim 16, wherein the by-product hydrogen discharge plant performs hydrogen purification on the hydrogen-containing gas after the carbon dioxide recovery device recovers the carbon dioxide. A carbon dioxide recovery device for recovering the carbon dioxide from the carbon dioxide-containing gas discharged from the carbon dioxide emission plant is provided.
The compound production system according to claim 16, wherein the by-product hydrogen discharge plant includes a hydrogen purification device provided on a flow path through which the carbon dioxide-containing gas flows from the carbon dioxide discharge plant to the carbon dioxide capture device. By controlling the recovery rate of the carbon dioxide recovery device, the flow rate adjusting device guides the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant. The composite production system according to claim 17 or 18, which is configured as such. A carbon dioxide recovery device that recovers the carbon dioxide from the carbon dioxide-containing gas,
At least one valve for adjusting the flow rate ratio between the mainstream line connected to the carbon capture device and the bypass line bypassing the carbon capture device.
16. The composite production system according to claim 16. The flow rate adjusting device is configured to guide the carbon dioxide whose flow rate is adjusted with respect to the flow rate of the by-product hydrogen supplied to the synthesis plant to the synthesis plant by controlling the flow rate ratio. The composite production system according to claim 20. The compound production system according to any one of claims 1 to 21, wherein the synthesis plant produces at least one of methanol, methane, and dimethyl ether as the compound. By-product hydrogen discharge step to discharge by-product hydrogen and
A carbon dioxide emission step that emits carbon dioxide-containing gas,
A compound production step of producing a compound by synthesizing the by-product hydrogen and carbon dioxide contained in the carbon dioxide-containing gas, and
A flow rate at which a part of the carbon dioxide emitted in the carbon dioxide emission step is extracted and the flow rate is adjusted with respect to the flow rate of the by-product hydrogen used in the compound production step to lead the carbon dioxide to synthesis. Adjustment steps and
A compound production method comprising.

Images