Carbon dioxide recovery device

Abstract

The problem to be solved by the present invention is to provide a carbon dioxide recovery device capable of stopping the operation of the device or resuming the operation from the stop while maintaining a state in which an adsorbent is not deteriorated. [Solution] This carbon dioxide recovery device (1) is provided with: a first power source (41) for supplying power for cooling an adsorbent (12) at least by means of a heat exchange device (80); a second power source (42) that supplies power to at least the valves (21, 22, 23, 24); and a backup power supply (43) for supplying power to the valve when the second power supply (42) is powered off. Furthermore, when the first power source (41) is powered off, pressure maintaining control is performed on the module (11) which has been decompressed and has reached a high temperature in the desorption step, said pressure maintaining control being for maintaining the internal pressure of the module (11) by controlling the valve with the power of the second power source (42) so as to prevent the inflow of atmosphere, and for maintaining the internal pressure of the module (11) by controlling the valve with the power of the second power source (42) when the second power source (42) is powered off. The internal pressure of the module (11) is maintained by controlling the valve by the power of the backup power supply (43) so as to prevent the atmospheric air from flowing into the module which has been decompressed and has reached a high temperature in the desorption step.

Description

Technical Field

[0001] The invention relates to a carbon dioxide recovery device. Background Art

[0002] Conventionally, in the technology for recovering specific components from the atmosphere or exhaust gas, there is a known technology for preventing damage to the device in an emergency.

[0003] Patent Document 1 discloses an exhaust gas treatment system that directs exhaust gas from a boiler, etc., through a flue into a desulfurization absorption tower. After desulfurization, the exhaust gas is discharged to the outside. Patent Document 1 utilizes an atmospheric air introduction mechanism to introduce atmospheric air into the exhaust gas in the flue in an emergency, lowering the exhaust gas temperature and preventing damage caused by combustion of the exhaust gas.

[0004] [Prior Art Literature]

[0005] [Patent Document]

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 8-168637 Summary of the Invention

[0007] [Problems to be solved by the invention]

[0008] However, in the carbon dioxide recovery device, an adsorption process and a desorption process are performed to recover carbon dioxide. The adsorption process is to absorb gases such as air containing carbon dioxide into the module holding the adsorption material to adsorb the carbon dioxide on the adsorption material. The desorption process is to reduce the pressure and heat the adsorption material to desorb the adsorbed carbon dioxide.

[0009] If the adsorbent material is exposed to air at high temperatures, it will oxidize, reducing its adsorption performance. During normal operation, the valve is controlled to isolate the adsorbent from the atmosphere. However, during a power outage or malfunction, there is a risk that the valve could open, potentially breaking the barrier between the adsorbent and the atmosphere. During the desorption process, high temperatures are maintained, so if air enters the module, the adsorbent material could degrade.

[0010] An object of the present invention is to provide a carbon dioxide recovery device capable of stopping the operation of the device or resuming the operation from a stop while maintaining a state in which an adsorbent is not degraded.

[0011] [Technical means to solve the problem]

[0012] (1) The present invention is a carbon dioxide recovery device (for example, the carbon dioxide recovery device 1 described below), comprising: a module (for example, the module 11 described below), which has an adsorbent material (for example, the adsorbent material 12 described below) inside, and performs an adsorption process and a desorption process, wherein the adsorption process is to absorb a gas containing carbon dioxide into the adsorbent material to adsorb the carbon dioxide, and the desorption process is to desorb the carbon dioxide from the adsorbent material by heating the surrounding of the adsorbent material under a reduced pressure state; a heat exchange device (for example, the heat exchange device 80 described below), which performs heat exchange on the module to cool the adsorbent material; a valve (for example, the first valve 21, the second valve 22, the third valve 23, and the fourth valve 24 described below), which is used to control the inflow and outflow of gas into and out of the interior of the module; a first power source (for example, For example, the first power supply 41 described below supplies power at least for cooling the adsorption material using the heat exchange device; the second power supply (for example, the second power supply 42 described below) supplies power to at least the valve; and the backup power supply (for example, the backup power supply 43 described below) supplies power to the valve when the second power supply fails; and, when the first power supply fails, pressure maintaining control is performed on the module after the pressure is reduced and the temperature is reached in the desorption process, and the pressure maintaining control is to use the power of the second power supply to control the valve to prevent the inflow of atmosphere, so as to maintain the internal pressure of the module. When the second power supply fails, the valve is controlled by the power of the backup power supply to prevent the inflow of atmosphere, so as to maintain the internal pressure of the module after the pressure is reduced and the temperature is reached in the desorption process.

[0013] (2) According to the carbon dioxide recovery device described in (1) above, when the second power supply fails, the power of the backup power supply 43 can be used to control the valve to prevent the inflow of atmosphere to maintain the internal pressure of the module, and the power of the first power supply can be used to control the heat exchange device to perform forced cooling of the module.

[0014] (3) According to the carbon dioxide recovery device described in (1) or (2) above, when both the first power supply and the second power supply fail, the backup power supply can be used to control the valve to prevent the inflow of atmosphere, thereby maintaining the internal pressure of the module.

[0015] (4) The carbon dioxide recovery device described in (3) above may further include an inert gas tank (for example, the inert gas tank 69 described below), which can supply inert gas to the interior of the module, and prevent the atmosphere from flowing into the interior of the module when both the first power supply and the second power supply are out of power, and supply the inert gas from the inert gas tank to the interior of the module.

[0016] (Effects of the Invention)

[0017] According to the present invention, it is possible to provide a carbon dioxide recovery device capable of stopping the operation of the device or resuming the operation from a stop while maintaining a state in which the adsorbent is not degraded. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram showing a configuration related to the flow of gas in a carbon dioxide recovery apparatus according to one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram showing the configuration related to the flow of liquid in the carbon dioxide recovery apparatus according to this embodiment.

[0020] Figure 3 This is a schematic diagram showing the configuration related to the flow of gas in the modules of the carbon dioxide recovery device according to the present embodiment.

[0021] Figure 4 This is a schematic diagram showing the configuration related to the flow of liquid in the modules of the carbon dioxide recovery device according to the present embodiment.

[0022] Figure 5 Schematic diagram showing a power supply system of the carbon dioxide recovery device according to this embodiment.

[0023] Figure 6 This is a circuit diagram showing the relationship between the power supply system and modules of the carbon dioxide recovery device according to this embodiment.

[0024] Figure 7 This is a flowchart showing the processing flow of the operation control according to the power supply status of the carbon dioxide recovery device of this embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0026] <Overall composition>

[0027] Figure 1 This is a schematic diagram showing a configuration related to the flow of gas in a carbon dioxide recovery device 1 according to one embodiment of the present invention. Figure 2 Schematic diagram showing the structure related to the flow of liquid in the carbon dioxide recovery device 1 of this embodiment. Figure 1 In the figure, the structure related to the flow of the liquid in the carbon dioxide recovery device 1 is omitted. Figure 2 In FIG, the configuration related to the flow of gas in the carbon dioxide recovery device 1 is omitted from illustration.

[0028] The carbon dioxide recovery device 1 of this embodiment is used, for example, in direct air capture (DAC) technology to recover atmospheric carbon dioxide to reduce atmospheric carbon dioxide concentration. The carbon dioxide recovered by the carbon dioxide recovery device 1 is stored underground or reused as fuel or material.

[0029] like Figure 1 and Figure 2 As shown, the carbon dioxide recovery device 1 of this embodiment includes a module unit 10, a fan 61, a vacuum pump 62, a carbon dioxide recovery pump 63, an intermediate cooler 64, a separator 65, a carbon dioxide tank 66, a compressor 67, an inert gas tank 69, a heat exchange device 80 and a control device 90.

[0030] like Figure 1 As shown, the carbon dioxide recovery device 1 includes an adsorption line 101 , a vacuum line 102 , a carbon dioxide line 103 , a circulation line 104 , and an inert gas supply line 107 as gas flow paths.

[0031] The module unit 10 is formed by arranging a plurality of carbon dioxide adsorbing modules 11 in parallel. In this embodiment, a total of 16 modules 11 are arranged by a pair of left and right module units 10.

[0032] Figure 3 This is a schematic diagram illustrating the configuration related to the gas flow in module 11 of the carbon dioxide recovery device 1 according to this embodiment. Module 11 is a carbon dioxide recovery module and includes an adsorbent 12, a first valve 21, a second valve 22, a third valve 23, a fourth valve 24, a pressure sensor 25, a carbon dioxide sensor 26, and a temperature sensor 27.

[0033] Adsorbent 12 is placed inside module 11 to adsorb carbon dioxide. Adsorbent 12 is a granular member that adsorbs carbon dioxide at low temperatures (e.g., -30°C to 50°C) and desorbs (releases) carbon dioxide at high temperatures (e.g., 50°C to 110°C) when the ambient carbon dioxide concentration is low. Examples of this adsorbent 12 include solid amine carbon dioxide adsorbents composed of an amine supported on a porous material such as silica.

[0034] The first valve 21 is an on / off valve located at the connection between the carbon dioxide line 103, which recovers carbon dioxide, and the module 11. A carbon dioxide recovery pump 63 is located on the carbon dioxide line 103. The second valve 22 is an on / off valve located at the connection between the vacuum line 102, which is equipped with the vacuum pump 62, and the module 11. The third valve 23 is an on / off valve located at the inlet that draws atmospheric air and other substances into the module 11. The fourth valve 24 is an on / off valve located at the connection between the adsorption line 101 and the module 11.

[0035] The opening and closing of the first valve 21, the second valve 22, the third valve 23 and the fourth valve 24 are all controlled by the control device 90. The first valve 21, the second valve 22, the third valve 23 and the fourth valve 24 are, for example, normally open butterfly valves.

[0036] The pressure sensor 25 measures the internal pressure of the module 11. The carbon dioxide sensor 26 measures the carbon dioxide concentration inside the module 11. The temperature sensor 27 measures the temperature of the adsorbent 12. The measurement information of the pressure sensor 25, carbon dioxide sensor 26, and temperature sensor 27 is transmitted to the control device 90.

[0037] return Figure 1 The adsorption line 101 and fan 61 will be described. The adsorption line 101 branches and is connected to each module 11. The fan 61 is located where the branched sections of the adsorption line 101 converge. When the fan 61 is driven, a gas flow from "intake" to "exhaust" is generated through the adsorption line 101 into the module 11. This supplies atmospheric air into the module 11. A carbon dioxide concentration sensor 611, a humidity sensor 612, and a temperature sensor 613 are located at the gas exhaust section of the adsorption line 101 to measure the carbon dioxide, humidity, and temperature exhausted from the adsorption line 101. The measurement information from the carbon dioxide concentration sensor 611, humidity sensor 612, and temperature sensor 613 is transmitted to the control device 90.

[0038] The vacuum line 102 is branched and connected to each module 11. A vacuum pump 62 is located at the junction of the branched portions of the vacuum line 102. When the vacuum pump 62 is driven, it draws gas from the interior of the module 11 through the vacuum line 102, creating a vacuum state or a near-vacuum state inside the module 11.

[0039] The carbon dioxide line 103 is branched and connected to each module 11. A carbon dioxide recovery pump 63, an intercooler 64, a separator 65, and a carbon dioxide tank 66 are arranged at the convergence of the branched portions of the carbon dioxide line 103.

[0040] The carbon dioxide recovery pump 63 exerts a suction force to transport the carbon dioxide flowing through the carbon dioxide line 103 to the carbon dioxide tank 66. A check valve 631 is disposed upstream of the carbon dioxide recovery pump 63 in the carbon dioxide line 103. This prevents gas from flowing back from the intercooler 64 to the module 11.

[0041] The intercooler 64 is an intermediate cooler that cools the high-temperature gas containing carbon dioxide recovered from the module 11 and performs gas-liquid separation.

[0042] The water separated from the gas-liquid separation in the intercooler 64 is recovered in the separator 65. Furthermore, the separator 65 is provided with a first valve 651 and a second valve 652. The first valve 651 opens or closes the passage connecting the gas phase of the separator 65 to the atmosphere. The second valve 652 opens or closes the passage connecting the liquid phase of the separator 65 to the atmosphere.

[0043] Separator 65 separates carbon dioxide and water from the carbon dioxide-containing gas that passes through intercooler 64. Separator 65 is provided with a first separator valve 651 and a second separator valve 652. First separator valve 651 opens or closes the path communicating with the gas phase of separator 65. Second separator valve 652 opens or closes the path communicating with the liquid phase of separator 65.

[0044] The carbon dioxide tank 66 stores carbon dioxide recovered through the carbon dioxide line 103. A tank valve 661 is disposed upstream of the carbon dioxide tank 66 in the carbon dioxide line 103. The opening and closing of the tank valve 661 is controlled by the control device 90. Furthermore, various sensors, such as a pressure sensor 662, a flow rate sensor 663, a humidity sensor 664, a temperature sensor 665, and a carbon dioxide concentration sensor 666, are disposed between the tank valve 661 in the carbon dioxide line 103 and the carbon dioxide tank 66.

[0045] In addition to the carbon dioxide line 103, the carbon dioxide tank 66 is connected to a circulation line 104 that returns ballast to the carbon dioxide recovery pump 63. A flow rate sensor 667 is provided on the circulation line 104. Furthermore, the carbon dioxide tank 66 is provided with a pressure relief valve 668 that releases pressure when the pressure exceeds a specific value.

[0046] Next, the inert gas tank 69 will be described. The inert gas tank 69 stores inert gas N2 supplied from an N2 gas cylinder 691 at a constant pressure or higher (e.g., 980 kPa). A cylinder valve 692 is located between the inert gas tank 69 and the N2 gas cylinder 691. Furthermore, a pressure relief valve 693 is located within the inert gas tank 69, which releases pressure above a specific pressure. A pressure sensor 694 is located within the inert gas tank 69. Pressure information measured by the pressure sensor 694 is transmitted to the control device 90.

[0047] The inert gas tank 69 is connected to the carbon dioxide line 103 via the inert gas supply line 107. An inert gas valve 695 is provided on the inert gas supply line 107. The opening and closing of the inert gas valve 695 is controlled by the control device 90.

[0048] refer to Figure 2 The heat exchange device 80 is described below. The heat exchange device 80 supplies heat energy for heating the interior of each module 11 of the module unit 10 to a specific temperature when the module 11 performs the desorption process. The heat exchange device 80 also recovers heat energy not required by the module 11 during the adsorption process.

[0049] The heat exchange device 80 of this embodiment includes a heat exchanger 81 , a cold water tank 82 , a cold water line 111 , a warm water tank 83 , a warm water line 112 , a three-way valve 30 , a bypass path 31 , and a bypass valve 32 .

[0050] Heat exchanger 81 exchanges heat between the heat medium flowing in cold water line 111 and the heat medium flowing in hot water line 112. Heat exchanger 81 is, for example, a heat pump. The heat medium is, for example, a liquid such as water. Heat transfer generated in heat exchanger 81 cools the heat medium flowing in cold water line 111 and heats the heat medium flowing in hot water line 112.

[0051] The cold water tank 82 stores the heat medium flowing through the cold water line 111. After being stored in the cold water tank 82, the heat medium flowing through the cold water line 111 is transported to the heat exchanger 81. Furthermore, the heat medium cooled by the heat exchanger 81 returns to the cold water tank 82 and is then transported to each module 11 through the cold water line 111. A heat exchanger circulation pump 821 is located between the cold water tank 82 and the heat exchanger 81 on the cold water line 111. Driven by the heat exchanger circulation pump 821, the heat medium flowing through the cold water line 111 circulates between the cold water tank 82 and the heat exchanger 81.

[0052] The cold water line 111 branches and connects to the upstream and downstream sides of each module 11, connecting the cold water tank 82 to each module 11. A first cold water circulating pump 822 and a second cold water circulating pump 823 are disposed between the cold water tank 82 and each module 11 on the cold water line 111. Furthermore, a circulation line 824 is disposed on the cold water line 111, returning from the downstream side of the second cold water circulating pump 823 to the upstream side. A circulation valve 825 is disposed on this circulation line 824.

[0053] A temperature sensor 826 and a flow rate sensor 827 are located downstream of a circulation valve 825 in the cold water line 111. Furthermore, a temperature sensor 828 is located near the portion where the heat medium in the cold water line 111 returns to the cold water tank 82. Temperature sensor 828 measures the temperature of the heat medium as it circulates through the cold water line 111 before returning to the cold water tank 82. Measurement information from temperature sensor 826, flow rate sensor 827, and temperature sensor 828 is transmitted to the control device 90.

[0054] The warm water tank 83 stores the heat medium flowing through the warm water line 112. The heat medium flowing through the warm water line 112 is stored in the warm water tank 83 and then transported to the heat exchanger 81. Furthermore, the heat medium heated by the heat exchanger 81 returns to the warm water tank 83 and is then transported to each module 11 through the warm water line 112. A heat exchanger circulation pump 831 is provided between the warm water tank 83 and the heat exchanger 81 on the warm water line 112. Driven by the heat exchanger circulation pump 831, the heat medium flowing through the warm water line 112 circulates between the warm water tank 83 and the heat exchanger 81.

[0055] The warm water line 112 branches and connects to the upstream and downstream sides of each module 11, connecting the warm water tank 83 to each module 11. A first warm water circulation pump 832 and a second warm water circulation pump 833 are disposed between the warm water tank 83 and each module 11 on the warm water line 112. Furthermore, a circulation line 834 is disposed on the warm water line 112, returning from the downstream side of the second warm water circulation pump 833 to the upstream side. A circulation valve 835 is disposed on this circulation line 834.

[0056] A temperature sensor 836 and a flow rate sensor 837 are located downstream of the circulation valve 835 in the hot water line 112. Furthermore, a temperature sensor 838 is located near the portion where the heat medium in the hot water line 112 returns to the hot water tank 83. Temperature sensor 838 measures the temperature of the heat medium as it circulates through the hot water line 112 and before returning to the hot water tank 83. Measurement information from temperature sensor 836, flow rate sensor 837, and temperature sensor 838 is transmitted to the control device 90.

[0057] The three-way valve 30 is connected to the cold water line 111, the hot water line 112, and the module 11. The three-way valve 30 is disposed on the upstream and downstream sides of the module 11. The three-way valve 30 is configured to switch between a cold water connection state in which the cold water line 111 is connected to the module 11, a hot water connection state in which the hot water line 112 is connected to the module 11, and a blocked state in which the cold water line 111 and the hot water line 112 are blocked from the module 11.

[0058] The flow path switching of the three-way valve 30 is controlled by the control device 90. In the module 11, the heat medium is introduced through the three-way valve 30 arranged upstream, and the heat medium is returned to the heat exchanger 81 side through the three-way valve 30 arranged downstream.

[0059] The bypass path 31 is a flow path that allows heat medium to flow between modules 11. The bypass path 31 connects two modules 11. The modules 11 connected by the bypass path 31 may be adjacent modules or separated non-adjacent modules 11.

[0060] The bypass valve 32 is disposed on the bypass path 31. The bypass valve 32 is disposed on each of the plurality of bypass paths 31. The opening and closing of the bypass valve 32 is controlled by the control device 90.

[0061] Figure 4 Schematic diagram showing the structure related to the flow of liquid in the module 11 of the carbon dioxide recovery device 1 of this embodiment. Figure 4 As shown, the module 11 includes an inlet-side flow path 33 connected to an inlet through which the heating medium flows in, and an outlet-side flow path 34 connected to an outlet through which the heating medium flows out.

[0062] The bypass path 31 is connected to the outlet flow path 34 of the module 11 and to the inlet flow path 33 of another module 11. A three-way valve 30 is disposed at the upstream end of the inlet flow path 33, and a three-way valve 30 is also disposed at the downstream end of the outlet flow path 34.

[0063] A temperature sensor 35 is disposed on the inlet-side flow path 33. A temperature sensor 36 and a flow rate sensor 37 are disposed on the outlet-side flow path 34. Measurement information from the temperature sensor 35, the temperature sensor 36, and the flow rate sensor 37 is transmitted to the control device 90.

[0064] Next, the control device 90 will be described. The control device 90 controls the operation of various components of the carbon dioxide recovery apparatus 1. It controls operations such as the activation and deactivation of equipment used for carbon dioxide adsorption and desorption. The control device 90 controls the opening and closing of the first valve 21, second valve 22, third valve 23, and fourth valve 24 included in each module 11, the opening and closing of each bypass valve 32, and the opening and closing of the separator first valve 651, separator second valve 652, tank valve 661, and inert gas valve 695. Furthermore, the control device 90 controls the activation of the fan 61, vacuum pump 62, and carbon dioxide recovery pump 63, as well as the opening and closing of the circulation valves 825 and 835. Furthermore, the control device 90 controls the activation of the heat exchanger circulating water pump 821, the first cold water circulating water pump 822, the second cold water circulating water pump 823, the heat exchanger circulating water pump 831, the first warm water circulating water pump 832, and the second warm water circulating water pump 833.

[0065] The control device 90 is, for example, a computer having a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), etc. The control device 90 may be composed of one or more devices.

[0066] <Carbon Dioxide Recovery>

[0067] Next, the control for recovering carbon dioxide performed by the control device 90 will be described. The carbon dioxide recovery device 1 removes and recovers carbon dioxide from the air by alternating between an adsorption process, in which carbon dioxide from gases such as the atmosphere is adsorbed onto the adsorbent 12 within the module 11, and a desorption process, in which the carbon dioxide adsorbed by the adsorbent 12 is desorbed, storing the desorbed carbon dioxide in the carbon dioxide tank 66.

[0068] The adsorption process is a step in which carbon dioxide is adsorbed onto the adsorbent material 12 within the module 11. During the adsorption process, the third valve 23 and the fourth valve 24 of the module 11 are open, and the first valve 21 and the second valve 22 are closed. The fan 61 is driven to generate a flow of gas from upstream to downstream, drawing in gas containing carbon dioxide (e.g., atmospheric air) through the third valve 23. The drawn gas passes through the adsorbent material 12 within the module 11. At this time, the temperature within the module 11 is at room temperature (25°C), and the carbon dioxide in the gas is adsorbed onto the adsorbent material 12. Gases other than oxygen dioxide, such as nitrogen or oxygen, are discharged to the exterior of the carbon dioxide recovery device 1 through the fourth valve 24 and the adsorption line 101.

[0069] The desorption process desorbs carbon dioxide from the adsorbent material 12 within the module 11. During the desorption process, the first, third, and fourth valves 21, 23, and 24 of the module 11 are closed, and the second valve 22 is opened. The vacuum pump 62 operates, sucking air from the interior of the module 11 and reducing the pressure to a vacuum or near-vacuum state. Simultaneously, a heat medium, acting as a heat source, flows through the heat exchanger 80 within the module 11, supplying thermal energy and thereby raising the temperature of the adsorbent material 12 within the module 11. By controlling the temperature of the adsorbent material 12, the adsorbent material 12 is heated to a specific temperature sufficient for the desorption process (e.g., 80°C), allowing the carbon dioxide adsorbed by the adsorbent 12 to be desorbed. Next, the second, third, and fourth valves 22, 23, and 24 are closed, the first valve 21 is opened, and the carbon dioxide recovery pump 63 is activated, transferring the desorbed carbon dioxide through the carbon dioxide pipeline 103 and storing it in the carbon dioxide tank 66. In this embodiment, each process is controlled so that 12 modules out of the 16 modules 11 perform the adsorption process and the remaining 4 modules perform the desorption process.

[0070] <Power System>

[0071] Next, refer to Figure 5 A power supply system that supplies power to each component of the carbon dioxide recovery device 1 will be described. Figure 5 Schematic diagram showing the power supply system of the carbon dioxide recovery device 1 of this embodiment. Figure 5 As shown, the carbon dioxide recovery device 1 includes a first power source 41 and a second power source 42 for supplying electric power to various devices.

[0072] The first power supply 41 is a 200 V power supply that supplies power to various devices, including those used for emergency forced cooling. Examples of devices powered by the first power supply 41 include the fan 61, vacuum pump 62, carbon dioxide recovery pump 63, heat exchanger 81, heat exchanger circulating water pump 821, first cold water circulating water pump 822, second cold water circulating water pump 823, heat exchanger circulating water pump 831, first warm water circulating water pump 832, and second warm water circulating water pump 833.

[0073] Among the devices supplied with power by the first power source 41, the second cold water circulating water pump 823 is a device that implements a forced cooling function for forced cooling in an emergency. Furthermore, the devices that implement forced cooling in an emergency are not limited to the second cold water circulating water pump 823. In addition to the second cold water circulating water pump 823, the devices that implement forced cooling in an emergency may also include a heat exchanger circulating water pump 821 and a first cold water circulating water pump 822.

[0074] The second power supply 42 is a 100 V, 24 V, or 12 V power source, and supplies power to various devices, including those used to maintain pressure in an emergency. Devices powered by the second power supply 42 include various valves such as the first valve 21, the second valve 22, the third valve 23, the fourth valve 24, the inert gas valve 695, the three-way valve 30, the check valve 631, and the bypass valve 32, as well as various measuring devices and sensors such as the pressure sensor 25, the temperature sensor 27, the temperature sensor 35, the temperature sensor 36, and the flow sensor 37.

[0075] Among the devices supplied with power by the second power source 42, the first valve 21, the second valve 22, the third valve 23, the fourth valve 24, the pressure sensor 25, the temperature sensor 27, the temperature sensor 35, the temperature sensor 36, the flow sensor 37, and the inert gas valve 695 implement a pressure-maintaining function for maintaining the internal pressure of the module 11 in an emergency. Furthermore, the devices implementing the pressure-maintaining function in an emergency are not limited to the first valve 21, the second valve 22, the third valve 23, the fourth valve 24, the pressure sensor 25, the temperature sensor 27, the temperature sensor 35, the temperature sensor 36, the flow sensor 37, and the inert gas valve 695. The devices implementing the pressure-maintaining function may also include other components.

[0076] In an emergency, power is supplied from the backup power supply 43 to the devices supplied with power from the second power supply 42 .

[0077] exist Figure 5 In the example shown, the system is divided into two groups: a 200V power supply, representing the first power source 41, and a 100V power source, a 24V power source, and a 12V power source, representing the second power source 42. The 200V power source includes devices that perform a forced cooling function, while the 100V, 24V, and 12V power sources include devices that perform a pressure maintenance function. In this embodiment, the devices powered by the 200V power source also include a carbon dioxide recovery pump, a fan, and other devices that are not directly related to the devices that perform the forced cooling function. At least one of the water pumps shown in the figure is included in the devices that perform the forced cooling function. Similarly, the devices powered by the 100V, 24V, and 12V power sources also include three-way valves, check valves, radiator fans, and other devices that are not directly related to the devices that perform the pressure maintenance function. Some or all of the closed and opened gas valves are included in the devices that perform the pressure maintenance function. By dividing the devices into the first and second groups, the capacity of the backup power source 43 responsible for the second group can be reduced compared to when the backup power source 43 also serves the first group.

[0078] Figure 61 is a circuit diagram showing the relationship between the power supply system and the module 11 of the carbon dioxide recovery device 1 of this embodiment. Figure 6 As shown, a backup power supply 43 is connected to the power system to which the second power supply 42 supplies power.

[0079] The second power supply 42, which is a 100 V power supply, supplies power to the 24 V power supply 421 and the 12 V power supply 422. The 24 V power supply 421 transforms the power from the second power supply 42 and supplies it to the main terminal block 51, while the 12 V power supply 422 transforms the power from the second power supply 42 and supplies it to the main terminal block 51.

[0080] The main terminal block 51 is connected to a main electronic control unit (ECU) 52. The main ECU 52 is connected to the sub-ECUs 53 of each module 11 via a controller area network (CAN) and to a rapid control prototyping (RCP) 54. Furthermore, a relay box 55 and device sensors 56 are connected to the main ECU 52. The relay box 55 has built-in power supply terminals connected to the power supply terminals of the main terminal block 51 and signal line connection terminals for the device sensors 56. The device sensors 56 are various sensors related to the forced cooling function.

[0081] The sub-ECU 53 of the module 11 controls the device module 57 that implements the pressure maintaining function based on the control signal from the main ECU 52. The device module 57 includes the first valve 21, the second valve 22, the third valve 23, the fourth valve 24, etc. The sub-ECU 53 is connected to a device sensor 58 that measures the pressure or temperature of the module 11, and is also connected to a relay box 59. The relay box 59 receives power from the 24 V power supply 421 and the 12 V power supply 422 via the main terminal block 51, and is also connected to the device sensor 58. Figure 6 The relationship between the power supply system and the modules 11 of the carbon dioxide recovery device 1 has been described.

[0082] In this embodiment, in order to prevent the adsorbent 12 inside the module 11 from deteriorating during a power outage, inert gas filling control, pressure maintenance control, and forced cooling control are executed according to the power outage.

[0083] <Inert gas filling control>

[0084] Inert gas filling control is achieved by utilizing the power from the backup power supply 43 to maintain pressure. In the following description, during the desorption process under normal control, the interior of the module 11 is reduced to a negative pressure by the vacuum pump 62, and the temperature of the adsorbent 12 is maintained above a certain temperature by the heat exchanger 80. Furthermore, during normal operation, the first valve 21, tank valve 661, separator first valve 651, and separator second valve 652 are controlled to open or close depending on the operating conditions. The inert gas valve 695 is controlled to close, and the internal pressure of the inert gas tank 69 is maintained above a certain pressure.

[0085] In the inert gas filling control, first, the control device 90 controls all of the tank valve 661, the separator first valve 651, and the separator second valve 652 to be closed. The upstream side of the carbon dioxide tank 66 on the carbon dioxide line 103 is closed.

[0086] Next, the control device 90 controls the valves of the control target module 11, which is undergoing the desorption process. In this embodiment, the control device 90 maintains the fourth valve 24 of the adsorption line 101 closed and controls the second valve 22 of the vacuum line 102 and the third valve 23, which communicates with the atmosphere, to be closed. Furthermore, the control device 90 controls the inert gas valve 695 of the inert gas supply line 107 to be open. This establishes communication between the inert gas tank 69 and the carbon dioxide line 103.

[0087] Next, the control device 90 controls the first valve 21 of the carbon dioxide line 103 of the control target module 11 to an open state, thereby releasing the carbon dioxide line 103. Because the interior of the inert gas tank 69 is maintained at a pressure above a certain level, the inert gas N2 flows through the inert gas supply line 107 and the carbon dioxide line 103 into the interior of the module 11, which is in a vacuum state or a near-vacuum state. As a result, the interior of the module 11 is filled with the inert gas.

[0088] <Pressure holding control>

[0089] Pressure maintenance control is achieved by utilizing the power from the second power source 42 or the backup power source 43. The control device 90 controls the first valve 21, second valve 22, third valve 23, and fourth valve 24 of the control target module 11, which is undergoing the desorption process, to a closed state. This maintains the internal pressure of the module 11.

[0090] <Forced cooling control>

[0091] Next, forced cooling control is described. Forced cooling control utilizes the power from the first power source 41 to provide a forced cooling function. During forced cooling control, the control device 90 controls the three-way valve 30 located at the upstream end of the inlet flow path 33 of the module 11 undergoing the desorption process to connect the cold water line 111 to the inlet flow path 33. It also controls the three-way valve 30 located at the downstream end of the outlet flow path 34 to connect the cold water line 111 to the outlet flow path 34.

[0092] The control device 90 drives the second cold water circulating pump 823 to deliver the heat medium flowing through the cold water line 111 to the target module 11. During pump operation, in addition to the second cold water circulating pump 823, the heat exchanger circulating pump 821 or the first cold water circulating pump 822 may also be driven. This pump operation delivers the cooling heat medium from the cold water tank 82 through the cold water line 111 to the module 11.

[0093] <Operation control according to power supply conditions>

[0094] Next, refer to Figure 7 The operation control of the carbon dioxide recovery device 1 according to the power supply status will be described. Figure 7 This is a flowchart showing the processing flow of the operation control according to the power supply status of the carbon dioxide recovery device 1 of this embodiment.

[0095] In step S1, the control device 90 determines whether all power sources have been lost. If all power sources have been lost, the carbon dioxide recovery device 1 loses its pressure-maintaining and forced cooling functions. Loss of all power sources (200 V for the first power source 41 and 100 V, 24 V, and 12 V for the second power source 42) corresponds to a loss of both the pressure-maintaining and forced cooling functions, and therefore, processing proceeds to step S2 (step S1, yes).

[0096] In step S2, the backup power supply 43 is activated. This activation of the backup power supply 43 supplies power to various devices connected to the power supply system that receives power from the second power supply 42. The various devices connected to the power supply system of the second power supply 42 include the inert gas valve 695 that performs a pressure maintenance function, and the first, second, third, and fourth valves 21, 22, and 23 of the module 11.

[0097] In step S3, the control device 90 performs inert gas filling control by utilizing the pressure maintaining function achieved by activating the backup power supply 43. By the inert gas filling control, inert gas is introduced into the interior of the module 11 that has undergone the desorption process. Figure 1In the example shown in FIG, the inert gas is filled into the interior of the four modules 11 on the upper left. The processing of step S3 continues until it is determined that the internal temperature of the module 11 is below a certain temperature or it is determined that the module 11 is filled with inert gas. After the processing of step S3, the processing returns to step S1.

[0098] Next, in step S1, the case where it is determined that all power sources, 200 V of the first power source 41 and 100 V, 24 V, and 12 V of the second power source 42, have not been lost will be described. If it is determined that all power sources have not been lost, the process proceeds to step S4 (step S1, No).

[0099] In step S4, the control device 90 determines whether the first power source 41 is stopped. If the first power source 41 is stopped, the forced cooling function is lost. If the first power source 41 is lost, the process proceeds to step S5.

[0100] In step S5, the control device 90 uses the power of the uninterrupted second power supply 42 to perform pressure maintenance control on the module 11 that has undergone the desorption process. Through pressure maintenance control, the internal pressure of the target module 11 is maintained, and the module 11 is allowed to cool naturally. Natural cooling continues until the internal temperature of the module 11 is below a certain temperature, for example, with reference to the measurement information of the temperature sensor 27. Because the second power supply 42 is operating, unlike when the backup power supply 43 is used to supply power to each valve, the pressure maintenance state can be maintained even if natural cooling takes time. After processing step S5, the processing returns to step S1.

[0101] Next, the case where the first power supply 41 is not stopped in step S4 will be described. If the first power supply 41 is not stopped, the process proceeds to step S6. In step S6, the control device 90 determines whether the power supply other than the first power supply 41 (the 100 V, 24 V, or 12 V second power supply) is stopped.

[0102] When power sources other than the first power source 41 are stopped, the control device 90 advances the process to step S7 to activate the backup power source 43. After the backup power source 43 is activated in step S7, the control device 90 advances the process to step S8.

[0103] In step S8, the control device 90 uses the power supplied by the backup power supply 43 to maintain the pressure of the target module 11, and uses the power of the first power supply 41 that is not stopped to perform forced cooling control. This process is performed, for example, by referring to the measurement information of the temperature sensor 27 until the internal temperature is below a certain temperature. The cooling object of the forced cooling control is Figure 3 The four modules 11 are located in the upper left corner. After the process of step S8, the process returns to step S1.

[0104] If the power sources other than the first power source 41 are not shut down (step S6, No), the control device 90 indicates that all power sources are supplying power without any problems. Therefore, the process proceeds to step S9 for normal operation. During normal operation, control for carbon dioxide recovery is executed as described above. After step S9, the process returns to step S1.

[0105] As described above, the carbon dioxide recovery device 1 of this embodiment comprises: a module 11, which has an adsorbent material 12 inside and performs an adsorption process and a desorption process. The adsorption process is to attract the gas containing carbon dioxide to the adsorbent material 12 to adsorb the carbon dioxide, and the desorption process is to desorb the carbon dioxide from the adsorbent material 12 by heating the surrounding area of the adsorbent material 12 under a reduced pressure state; a heat exchange device 80, which performs heat exchange on the module 11 to cool the adsorbent material 12; valves (a first valve 21, a second valve 22, a third valve 23 and a fourth valve 24) for controlling the inflow and outflow of gas into and out of the module 11; a first electric The power source 41 supplies at least electricity for cooling the adsorption material 12 using the heat exchange device 80; the second power source 42 supplies electricity to at least the valve; and the backup power source 43 supplies electricity to the valve when the second power source 42 fails; and, when the first power source 41 fails, pressure maintenance control is performed on the module 11 after the pressure is reduced and the temperature is reached in the desorption process, and the pressure maintenance control is to use the electricity of the second power source 42 to control the valve to maintain the internal pressure of the module 11. When the second power source 42 fails, the electricity of the backup power source 43 is used to control the valve to maintain the internal pressure of the module 11 after the pressure is reduced and the temperature is reached in the desorption process.

[0106] This maintains the internal pressure of module 11 even during a power outage, preventing atmospheric air from entering the module 11 and preventing the adsorbent 12 from being exposed to the atmosphere at high temperatures and subsequently oxidized and degraded. The adsorbent 12 also cools naturally, preventing degradation over time even if power from backup power source 43 ceases. Furthermore, the backup power source 43 only needs to have a capacity that matches that of the second power source 42, thus minimizing the required capacity of the backup power source 43.

[0107] Furthermore, in this embodiment, when the second power source 42 fails, power from the backup power source 43 is used to control the valves to prevent atmospheric air from entering, thereby maintaining the internal pressure of the module 11 and controlling the heat exchanger 80 to forcibly cool the module 11. This forced cooling process rapidly cools the adsorbent material 12, thereby more reliably preventing deterioration of the adsorbent material 12. Furthermore, the time during which the internal pressure of the module 11 is maintained using power from the backup power source 43 can be shortened.

[0108] Furthermore, in this embodiment, when both the first power source 41 and the second power source 42 fail, the backup power source 43 controls the valve to prevent atmospheric air from entering, thereby maintaining the internal pressure of the module 11. Thus, while the internal pressure of the module 11 is maintained by the power of the backup power source 43, deterioration of the adsorbent 12 can be prevented by natural cooling.

[0109] Furthermore, in this embodiment, the carbon dioxide recovery device 1 further includes an inert gas tank 69, which can supply inert gas to the interior of the module 11. This prevents atmospheric air from flowing into the interior of the module 11 when both the first power source 41 and the second power source 42 experience a power outage, and inert gas is supplied to the interior of the module 11 from the inert gas tank 69. Thus, the introduction of inert gas can shorten the cooling time. Furthermore, since the adsorbent 12 is surrounded by the inert gas, it is possible to more effectively prevent the adsorbent 12 from being exposed to atmospheric air at high temperatures, causing oxidation and subsequent degradation.

[0110] While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments or modifications. Furthermore, the effects described in the above embodiments are merely preferred effects and are not limited to the contents described in the above embodiments.

[0111] Reference numerals

[0112] 1. Carbon dioxide recovery device

[0113] 11 modules

[0114] 12 Adsorption material

[0115] 21 First Valve

[0116] 22 Second valve

[0117] 23 Third valve

[0118] 24 Fourth Valve

[0119] 41 First Power Source

[0120] 42 Second Power Supply

[0121] 43 backup power supply

[0122] 69 inert gas tank

[0123] 80 heat exchange device

Claims

1. A carbon dioxide recovery device comprising: The module has an adsorbent material therein and performs an adsorption process and a desorption process. The adsorption process involves drawing a gas containing carbon dioxide into the adsorbent material to adsorb the carbon dioxide. The desorption process involves heating the area surrounding the adsorbent material under reduced pressure to desorb the carbon dioxide from the adsorbent material. a heat exchange device for performing heat exchange on the module to cool the adsorption material; A valve for controlling the inflow and outflow of gas into and out of the aforementioned interior of the aforementioned module; a first power source for supplying power for at least cooling the adsorption material using the heat exchange device; A second power supply supplies power to at least the valve; and a backup power supply for supplying power to the valve in the event of a power outage in the second power supply; and When the first power source fails, pressure maintenance control is performed on the module after the pressure is reduced and the temperature is reached in the desorption process. The pressure maintenance control utilizes the power of the second power source to control the valve to prevent the inflow of atmosphere, thereby maintaining the internal pressure of the module. When the second power source fails, the valve of the module after the module has been decompressed and reached a high temperature in the desorption process is controlled by the power of the backup power source to prevent the inflow of atmosphere, thereby maintaining the internal pressure of the module.

2. The carbon dioxide recovery device according to claim 1, wherein: When the second power source fails, the power of the backup power source is used to control the valve to prevent the inflow of atmosphere to maintain the internal pressure of the module, and the power of the first power source is used to control the heat exchange device to perform forced cooling of the module.

3. The carbon dioxide recovery device according to claim 1 or 2, wherein: When both the first power source and the second power source are out of power, the backup power source is used to control the valve to prevent the inflow of atmosphere, thereby maintaining the internal pressure of the module.

4. The carbon dioxide recovery device according to claim 3, wherein: The carbon dioxide recovery device further includes an inert gas tank capable of supplying inert gas to the interior of the module. When both the first power source and the second power source are powered off, the inert gas is supplied from the inert gas tank to the interior of the module while preventing atmospheric air from flowing into the interior of the module.

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