Carbon dioxide recovery apparatus

Abstract

To provide a configuration which can suppress variations in thermal load across the entire apparatus and enables continuous operation in a carbon dioxide recovery apparatus that performs a desorption process and an adsorption process through thermal control by a heat source unit of a heat pump type.SOLUTION: A heat exchange device 70 of a carbon dioxide recovery apparatus 1 includes a heat source unit 81 of a heat pump type, a heat source high-temperature water circuit 85 that includes a hot water tank 83 that stores hot water and circulates hot water between the hot water tank 83 and the heat source unit 81, a heat source low-temperature water circuit 86 that includes a cold water tank 82 that stores cold water and circulates cold water between the cold water tank 82 and the heat source unit 81, a hot water going line 112a that supplies hot water from the hot water tank 83 to a module 11, a hot water return line 112b that returns hot water after heating in the module 11 to the hot water tank 83, a cold water going line 111a that supplies cold water from the cold water tank 82 to the module 11, and a cold water return line 111b that returns cold water after cooling in the module 11 to the cold water tank 82.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide capture device. [Background technology]

[0002] Conventionally, technology that uses a heat source such as a heat pump in a system that uses a heat medium to heat or cool a target device is known. This type of technology is described, for example, in Patent Document 1. Patent Document 1 relates to an energy-saving ventilation air-conditioning system that maintains an air-conditioned space at a predetermined temperature and humidity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-276217 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, a heat source such as a heat pump is also used in carbon dioxide recovery devices that suck gases such as air containing carbon dioxide into a module that holds an adsorbent, adsorb the gas into the adsorbent, and then depressurize and heat the adsorbent to desorb the adsorbed carbon dioxide and recover the carbon dioxide.

[0005] The heat pump described in Patent Document 1 is designed to generate hot and cold energy at night when the power load is low, taking into consideration the need to cut the peak impact of daytime power loads. If a heat pump-type heat source device like that of conventional technology is applied as is to a carbon dioxide capture device that may operate continuously, regardless of day or night, the heat load fluctuations will become large.

[0006] The present invention aims to provide a configuration for a carbon dioxide recovery device that performs desorption and adsorption processes by thermal control of a heat pump-type heat source, which can suppress fluctuations in the thermal load of the entire device and enable continuous operation. [Means for solving the problem]

[0007] (1) The present invention relates to a system for supplying a heating medium (for example, hot water) to each of the modules and a cooling medium (for example, cold water) to each of the modules. The system includes a plurality of modules (for example, module 11) that contain an adsorbent (for example, adsorbent 12) and that perform an adsorption process of sucking a gas containing carbon dioxide into the adsorbent to adsorb the carbon dioxide, and a desorption process of heating the adsorbent under reduced pressure to desorb the carbon dioxide from the adsorbent. The heat exchanger includes a heat pump type heat source (for example, a heat source 81 described later) that heats the heating heat medium and cools the cooling heat medium, and a heating heat medium tank (for example, a hot water tank 83 described later) that stores the heating heat medium heated by the heat source, and the heating heat medium tank and the heat source a heat source high temperature water circuit (for example, a heat source high temperature water circuit 85 described later) that circulates the heating heat medium between the cooling heat medium tank (for example, a cold water tank 82 described later) that stores the cooling heat medium cooled by the heat source device, a heat source low temperature water circuit (for example, a heat source low temperature water circuit 86 described later) that circulates the cooling heat medium between the cooling heat medium tank and the heat source device, a heating heat medium supply line (for example, a hot water supply line 112a described later) that supplies the heating heat medium from the heating heat medium tank to the module, and The carbon dioxide recovery device (for example, the carbon dioxide recovery device 1 described later) has a heating heat medium return line (for example, the hot water return line 112b described later) that returns the heating heat medium to the heat medium tank after heating the module, a cooling heat medium supply line (for example, the cold water supply line 111a described later) that supplies the cooling heat medium from the cooling heat medium tank to the module, and a cooling heat medium return line (for example, the cold water return line 111b described later) that returns the cooling heat medium to the cooling heat medium tank after cooling the module.

[0008] (2) In the carbon dioxide recovery device described in (1) above, the flow path control unit may be configured to be able to control the flow paths for each of the modules, and may supply the cooling heat medium to the module that performs the adsorption process, and may supply the heating heat medium to the module that performs the desorption process.

[0009] (3) In the carbon dioxide capture device described in (2) above, the flow path control unit may be configured to be able to adjust the flow rate of the cooling heat medium or the heating heat medium supplied to the module.

[0010] (4) In the carbon dioxide recovery device described in (3) above, the flow path control unit may control the flow rate of the heating medium to be relatively large during the initial temperature rise stage of the desorption process, and to be relatively small during the temperature maintenance stage after the initial temperature rise stage has passed.

[0011] (5) In the carbon dioxide recovery device described in any one of (1) to (4) above, the heat source high-temperature water circuit may have a heating heat medium side heat source supply line (for example, a hot water side heat source supply line 221 described later) that sends the heating heat medium from the heating heat medium tank to the heat source device, and a heating heat medium side heat source return line (for example, a hot water side heat source return line 222 described later) that returns the heating heat medium from the heat source device to the heating heat medium tank, and the connection positions of the lines in the heating heat medium tank may be set to be in the order of the heating heat medium side heat source return line, the heating heat medium supply line, the heating heat medium side heat source supply line, and the heating heat medium return line from top to bottom.

[0012] (6) In the carbon dioxide recovery device described in any one of (1) to (4) above, the heat source low-temperature water circuit may have a cooling heat medium side heat source supply line (for example, a chilled water side heat source supply line 121 described later) that sends the cooling heat medium from the cooling heat medium tank to the heat source device, and a cooling heat medium side heat source return line (for example, a chilled water side heat source return line 122 described later) that returns the cooling heat medium from the heat source device to the cooling heat medium tank, and the connection positions of the lines of the cooling heat medium tank may be set to be, from top to bottom, the cooling heat medium return line, the cooling heat medium side heat source return line, the cooling heat medium supply line, and the cooling heat medium side heat source supply line. [Effects of the Invention]

[0013] According to the present invention, in a carbon dioxide recovery device that performs the desorption process and the adsorption process by thermal control of a heat pump-type heat source, a configuration can be provided that can suppress fluctuations in the thermal load of the entire device and enable continuous operation. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 2 is a schematic diagram showing a configuration relating to gas flow in a carbon dioxide capture device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a configuration relating to the flow of liquid in the carbon dioxide capture device of the present embodiment. [Figure 3] FIG. 2 is a schematic diagram showing the configuration of gas flow in the module of the carbon dioxide capture device of the present embodiment. [Figure 4] FIG. 2 is a schematic diagram showing the configuration regarding the flow of liquid in the module of the carbon dioxide capture device of the present embodiment. [Figure 5] 1 is a schematic diagram showing the configuration of a heat source circuit of a carbon dioxide recovery device according to an embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram showing the connection positions of each line connected to the hot water tank. [Figure 7] FIG. 2 is a schematic diagram showing the connection positions of each line connected to the cold water tank. [Figure 8]10 is a graph showing the time changes of the adsorbent temperature and the heat medium flow rate in the desorption step. [Figure 9] 10 is a graph showing the change over time in the heat exchange amount in the desorption step. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] <Overall structure> Fig. 1 is a schematic diagram showing the configuration related to gas flow in a carbon dioxide capture device 1 according to one embodiment of the present invention. Fig. 2 is a schematic diagram showing the configuration related to liquid flow in the carbon dioxide capture device 1 of this embodiment. Note that the configuration related to liquid flow in the carbon dioxide capture device 1 is omitted in Fig. 1, and the configuration related to gas flow in the carbon dioxide capture device 1 is omitted in Fig. 2.

[0017] The carbon dioxide capture device 1 of this embodiment is applied to, for example, direct air capture (DAC) technology that captures carbon dioxide from the atmosphere in order to reduce the carbon dioxide concentration in the atmosphere. The carbon dioxide captured by the carbon dioxide capture device 1 is stored underground or reused as fuel or material.

[0018] As shown in Figures 1 and 2, the carbon dioxide capture device 1 of this embodiment includes a module unit 10, a fan 61, a vacuum pump 62, a carbon dioxide capture pump 63, an intercooler 64, a separator 65, a carbon dioxide tank 66, an inert gas tank 69, a heat exchange device 70, and a control device 90.

[0019] As shown in FIG. 1, 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.

[0020] The module unit 10 is configured by arranging a plurality of modules 11 in parallel that adsorb carbon dioxide. In this embodiment, a total of 16 modules 11 are arranged by a pair of left and right module units 10.

[0021] 3 is a schematic diagram showing the configuration related to the gas flow in module 11 of carbon dioxide capture device 1 of this embodiment. Module 11 is a carbon dioxide capture module including 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.

[0022] The adsorbent 12 is disposed inside the module 11 to adsorb carbon dioxide. The adsorbent 12 is a particulate material that has the property of adsorbing carbon dioxide at low temperatures (for example, in the range of -30°C to 50°C) and desorbing (releasing) carbon dioxide at high temperatures (for example, in the range of 50°C to 110°C) when the ambient carbon dioxide concentration is low. Examples of such adsorbent 12 include solid amine carbon dioxide adsorbents formed by supporting amines on porous materials such as silica.

[0023] The first valve 21 is an on-off valve arranged at the connection between the module 11 and a carbon dioxide line 103 that captures carbon dioxide. A carbon dioxide capture pump 63 is arranged in the carbon dioxide line 103. The second valve 22 is an on-off valve arranged at the connection between the module 11 and a vacuum line 102 in which a vacuum pump 62 is arranged. The third valve 23 is an on-off valve arranged at the inlet that takes in air and the like into the module 11. The fourth valve 24 is an on-off valve arranged at the connection between the adsorption line 101 and the module 11.

[0024] The first valve 21, the second valve 22, the third valve 23, and the fourth valve 24 are all controlled to open and close by a control device 90. The first valve 21, the second valve 22, the third valve 23, and the fourth valve 24 are each configured by, for example, a normally open butterfly valve.

[0025] 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. Measurement information from the pressure sensor 25, the carbon dioxide sensor 26, and the temperature sensor 27 is sent to the control device 90.

[0026] Returning to FIG. 1 , the adsorption line 101 and the fan 61 will be described. The adsorption line 101 branches off and is connected to each of the modules 11. The fan 61 is located where the branched portions of the adsorption line 101 converge. When driven, the fan 61 generates a gas flow from "intake" to "exhaust" through the adsorption line 101 to 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 in the gas exhaust portion of the adsorption line 101, and measure the carbon dioxide, humidity, and temperature exhausted from the adsorption line 101. Measurement information from the carbon dioxide concentration sensor 611, the humidity sensor 612, and the temperature sensor 613 is sent to the control device 90.

[0027] The vacuum line 102 is branched and connected to each of the modules 11. The vacuum pump 62 is disposed at the point where the branched portions of the vacuum line 102 converge. When the vacuum pump 62 is driven, it sucks gas from inside the module 11 through the vacuum line 102, bringing the inside of the module 11 into a vacuum state or close to a vacuum state.

[0028] The carbon dioxide line 103 branches off and is connected to each of the modules 11. At the point where the branched portions of the carbon dioxide line 103 converge, a carbon dioxide capture pump 63, an intercooler 64, a separator 65, and a carbon dioxide tank 66 are arranged.

[0029] The carbon dioxide capture pump 63 applies suction force to send the carbon dioxide flowing through the carbon dioxide line 103 to the carbon dioxide tank 66. A one-way valve 631 is arranged upstream of the carbon dioxide capture pump 63 in the carbon dioxide line 103. This prevents gas from flowing back from the intercooler 64 side to the module 11 side.

[0030] The intercooler 64 is an intermediate cooling device that cools the high-temperature gas containing carbon dioxide recovered from the module 11 and separates it into gas and liquid.

[0031] The water separated into gas and liquid in intercooler 64 is recovered in separator 65. Separator 65 is provided with a first valve 651 and a second valve 652. First valve 651 opens and closes a path communicating with the gas phase part of separator 65. Second valve 652 opens and closes a path communicating with the liquid phase part of separator 65.

[0032] The carbon dioxide tank 66 stores the carbon dioxide recovered through the carbon dioxide line 103. A tank valve 661 is arranged on the carbon dioxide line 103 upstream of the carbon dioxide tank 66. The tank valve 661 is controlled to open and close by the control device 90. In addition, 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 arranged on the carbon dioxide line 103 between the tank valve 661 and the carbon dioxide tank 66.

[0033] In addition to the carbon dioxide line 103, a circulation line 104 that returns ballast to the carbon dioxide capture pump 63 is connected to the carbon dioxide tank 66. A flow rate sensor 667 is disposed in the circulation line 104. In addition, the carbon dioxide tank 66 is provided with a pressure release valve 668 that releases pressure when the pressure reaches or exceeds a predetermined value.

[0034] Next, the inert gas tank 69 will be described. The inert gas tank 69 stores N2 as an inert gas supplied from an N2 gas cylinder 691 at a certain pressure or higher (for example, 980 kPa). A gas cylinder valve 692 is arranged between the inert gas tank 69 and the N2 gas cylinder 691. Also, the inert gas tank 69 is arranged with a pressure release valve 693 that releases the pressure when the pressure reaches a predetermined pressure or higher. A pressure sensor 694 is arranged inside the inert gas tank 69. Pressure information measured by the pressure sensor 694 is sent to the control device 90.

[0035] The inert gas tank 69 is connected to the carbon dioxide line 103 via an inert gas supply line 107. An inert gas valve 695 is disposed on the inert gas supply line 107. The inert gas valve 695 is controlled to open and close by the control device 90.

[0036] The heat exchanger 70 will be described with reference to Fig. 2. The heat exchanger 70 supplies thermal energy for heating the interior of each module 11 of the module unit 10 to a predetermined temperature when the module 11 performs the desorption step. The heat exchanger 70 also recovers unnecessary thermal energy when the module 11 performs the adsorption step.

[0037] The heat exchange device 70 of this embodiment includes a heat source circuit 80, a cold water line 111, a hot water line 112, a three-way valve 30, a bypass path 31, and a bypass valve 32.

[0038] The heat source circuit 80 mainly comprises a heat source device 81, a cold water tank 82, and a hot water tank 83, and performs heat exchange between a cooling heat medium flowing in a cold water line 111 and a heating heat medium flowing in a hot water line 112. Due to the heat transfer that occurs in the heat source circuit 80, the heat medium flowing in the cold water line 111 is cooled and the heat medium flowing in the hot water line 112 is heated. The heat medium is, for example, a liquid such as water. The detailed configuration of the heat source circuit 80 will be described later with reference to FIG. 5.

[0039] The chilled water line 111 is a pipe through which chilled water flows as a cooling heat medium. The chilled water line 111 is branched and connected to the upstream and downstream sides of each module 11, connecting the chilled water tank 82 to each module 11. Of the chilled water lines 111, the line connected to the upstream side of each module 11 is referred to as a chilled water supply line 111a, and the line connected to the downstream side of each module 11 is referred to as a chilled water return line 111b.

[0040] The chilled water supply line 111a is connected in parallel to multiple modules 11, allowing chilled water to be supplied in parallel to each module 11. A first chilled water circulation water pump 822 and a second chilled water circulation water pump 823 are arranged in the chilled water supply line 111a. The first chilled water circulation water pump 822 and the second chilled water circulation water pump 823 are, for example, cascade pumps.

[0041] Additionally, a circulation line 824 is arranged in the chilled water supply line 111a, returning from the downstream side of the second chilled water circulation water pump 823 to the upstream side. A safety valve 825 is arranged in this circulation line 824. The safety valve 825 relieves pressure when the pressure in the system between the second chilled water circulation water pump 823 and the chilled water line 111 exceeds a certain level, thereby suppressing a pressure increase. By arranging the safety valve 825, which relieves pressure in the event of an abnormality in the chilled water line 111, in parallel with the second chilled water circulation water pump 823, it is possible to achieve both a large flow rate circulation by the second chilled water circulation water pump 823 and safe operation.

[0042] The cold water recovery line 111b is also connected in parallel to the plurality of modules 11, and the recovery of the cold water after the cooling is completed can also be carried out in parallel for each module 11.

[0043] The hot water line 112 is a pipe through which hot water flows as a heat medium for heating. The hot water line 112 is branched and connected to the upstream and downstream sides of each module 11, connecting the hot water tank 83 to each module 11. Of the hot water lines 112, the line connected to the upstream side of each module 11 is referred to as a hot water supply line 112a, and the line connected to the downstream side of each module 11 is referred to as a hot water return line 112b.

[0044] The hot water supply line 112a is connected in parallel to the multiple modules 11, allowing hot water to be supplied to each module 11 in parallel. A first hot water circulation water pump 832 and a second hot water circulation water pump 833 are arranged on the hot water supply line 112a. The first hot water circulation water pump 832 and the second hot water circulation water pump 833 are, for example, cascade pumps. By using a cascade pump that generates a large amount of heat when driven, it is possible to further heat the heat medium passing through the first hot water circulation water pump 832 and the second hot water circulation water pump 833.

[0045] Additionally, a circulation line 834 is arranged in the hot water supply line 112a, returning from the downstream side of the second hot water circulation water pump 833 to the upstream side. A safety valve 835 is arranged in this circulation line 834. The safety valve 835 relieves pressure when the pressure in the system between the second hot water circulation water pump 833 and the hot water line 112 exceeds a certain level, thereby suppressing a pressure increase. By arranging the safety valve 835, which relieves pressure in the event of an abnormality in the hot water line 112, in parallel with the second hot water circulation water pump 833, it is possible to achieve both a high flow rate circulation by the second hot water circulation water pump 833 and safe operation.

[0046] The hot water return line 112b is also connected in parallel to the plurality of modules 11, and the recovery of hot water after heating can also be performed in parallel for each module 11.

[0047] 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 each of the upstream and downstream sides of the module 11. The three-way valve 30 is configured to be able to select, by flow path switching, 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 cut-off state in which the connection between the cold water line 111 and the hot water line 112 and the module 11 is cut off.

[0048] The flow path switching of the three-way valve 30 is controlled by the control device 90. The heat medium is introduced into the module 11 through the three-way valve 30 arranged on the upstream side, and the heat medium is returned to the heat source device 81 side through the three-way valve 30 arranged on the downstream side.

[0049] The bypass path 31 is a flow path that enables the movement of the heat medium between the modules 11. The bypass path 31 connects two modules 11. The modules 11 connected by the bypass path 31 may be adjacent modules, or may be non-adjacent modules 11 located at a distance.

[0050] The bypass valve 32 is disposed in the bypass path 31. The bypass valve 32 is disposed in each of the plurality of bypass paths 31. The bypass valve 32 is controlled to open and close by the control device 90.

[0051] 4 is a schematic diagram showing the configuration related to the flow of liquid in module 11 of the carbon dioxide capture device 1 of this embodiment. In the following description, the three-way valve 30 arranged upstream of module 11 will be referred to as three-way valve 30a, and the three-way valve 30 arranged downstream of module 11 will be referred to as three-way valve 30b.

[0052] 4, the module 11 includes an inlet-side flow path 33 connected to an inlet through which the heat medium flows in, and an outlet-side flow path 34 connected to an outlet through which the heat medium flows out. The bypass path 31 is connected to the outlet-side flow path 34 of the module 11 and is also connected to the inlet-side flow path 33 of another module 11.

[0053] A three-way valve 30a is disposed at the upstream end of the inlet flow path 33, and a three-way valve 30b is disposed at the downstream end of the outlet flow path 34. In the hot water connection state, the three-way valve 30a is connected to the hot water supply line 112a, and the three-way valve 30b is connected to the hot water return line 112b. In the cold water connection state, the three-way valve 30a is connected to the cold water supply line 111a, and the three-way valve 30b is connected to the cold water return line 111b.

[0054] The three-way valves 30a and 30b are configured to be able to adjust the flow rate. This flow rate adjustment function allows the flow rate of hot water to be adjusted when the hot water supply is connected, and the flow rate of cold water to be adjusted when the cold water supply is connected.

[0055] A temperature sensor 35 is disposed in the inlet-side flow path 33. A temperature sensor 36 and a flow rate sensor 37 are disposed in 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.

[0056] Next, the control device 90 will be described. The control device 90 controls the operation of each part of the carbon dioxide capture device 1. The control device 90 controls the operation of devices used for adsorption and desorption of carbon dioxide, such as driving and stopping. The control device 90 selectively controls the timing of supplying a heat medium to each module 11 to heat or cool the modules 11, so that the multiple modules 11 repeatedly adsorb and desorb in time series.

[0057] The control device 90 controls the opening and closing of the first valve 21, second valve 22, third valve 23, and fourth valve 24 provided in each module 11, and the opening and closing of each bypass valve 32. The control device 90 also controls the drive of the fan 61, vacuum pump 62, carbon dioxide capture pump 63, first cold water circulation water pump 822, second cold water circulation water pump 823, first hot water circulation water pump 832, second hot water circulation water pump 833, etc., and controls the opening and closing of the safety valve 825 and safety valve 835.

[0058] The control device 90 is, for example, a computer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The control device 90 may be configured as a single device or as a plurality of devices. The control device 90 may also be configured using an electric circuit such as a relay.

[0059] <Carbon dioxide capture> Next, we will explain the control for capturing carbon dioxide by the control device 90. The carbon dioxide capture device 1 alternately performs an adsorption process in which the adsorbent 12 in the module 11 adsorbs carbon dioxide in gases such as the air that has been taken in, and a desorption process in which the carbon dioxide adsorbed by the adsorbent 12 is desorbed, and stores the desorbed carbon dioxide in the carbon dioxide tank 66, thereby removing and capturing carbon dioxide from the air.

[0060] The adsorption process is a process in which carbon dioxide is adsorbed by the adsorbent 12 in the module 11. During the adsorption process, the third valve 23 and the fourth valve 24 of the module 11 are opened, and the first valve 21 and the second valve 22 are closed. In addition to controlling the opening and closing of the valves, the heat exchanger 70 controls the three-way valves 30a and 30b to a cold water connection state, allowing cold water to flow through the module 11 and cool the adsorbent 12 in the module 11. The fan 61 is driven, generating a gas flow from upstream to downstream, and gas containing carbon dioxide (e.g., atmospheric air) is drawn in through the third valve 23. The drawn gas passes through the adsorbent 12 in the module 11. At this time, the inside of the module 11 is cooled to room temperature (25°C) by the cold water, and the carbon dioxide in the gas is adsorbed by the adsorbent 12. Gases other than carbon dioxide, such as nitrogen and oxygen, are exhausted to the outside of the carbon dioxide capture device 1 through the fourth valve 24 and the adsorption line 101.

[0061] The desorption process is a process of desorbing carbon dioxide from the adsorbent 12 in the module 11. In the desorption process, the first valve 21, the third valve 23, and the fourth valve 24 of the module 11 are closed, and the second valve 22 is opened. The vacuum pump 62 is operated to draw air into the interior of the module 11 and reduce the pressure to create a vacuum or near-vacuum state. In addition to controlling the opening and closing of the valves, the heat exchanger 70 controls the three-way valves 30a and 30b to a hot water connection state, and hot water flows through the module 11 to supply thermal energy and raise the temperature of the adsorbent 12 in the module 11. By controlling the temperature rise of the adsorbent 12, the adsorbent 12 is also heated to a predetermined temperature (e.g., 80°C) sufficient for the desorption process, and the carbon dioxide adsorbed in the adsorbent 12 is desorbed. Next, the second valve 22, the third valve 23, and the fourth valve 24 are closed, the first valve 21 is opened, and the carbon dioxide recovery pump 63 is driven, and the carbon dioxide desorbed through the carbon dioxide line 103 is stored in the carbon dioxide tank 66. In this embodiment, each process is controlled so that 12 of the 16 modules 11 perform the adsorption process and the remaining four perform the desorption process.

[0062] <Heat source circuit> Next, the detailed configuration of the heat source circuit 80 will be described with reference to Fig. 5. Fig. 5 is a schematic diagram showing the configuration of the heat source circuit 80 of the carbon dioxide recovery device 1 of this embodiment.

[0063] As shown in FIG. 5, the heat source circuit 80 of this embodiment includes a heat source device 81, a heat source high-temperature water circuit 85 including a hot water tank 83, a heat source low-temperature water circuit 86 including a cold water tank 82, and a reservoir tank 88.

[0064] The heat source device 81 cools the heat medium introduced from the cold water tank 82 and heats the medium introduced from the hot water tank 83. The heat source device 81 is composed of a heat pump that transfers heat by utilizing the compression and expansion of gas.

[0065] The heat source high temperature water circuit 85 circulates hot water between the hot water tank 83 and the heat source device 81. The heat source high temperature water circuit 85 includes the hot water tank 83, a hot water side heat source supply line 221, and a hot water side heat source return line 222.

[0066] The hot water tank 83 is a heat storage device that has a heat insulating function and can store a heat medium. The capacity of the hot water tank 83 is preferably at least five times the maximum flow rate discharged by the hot water circulation water pump 831, which will be described later. By setting the capacity of the hot water tank 83 to be large relative to the flow rate of the heat medium, it is possible to suppress temperature fluctuations of the hot water (heat medium) during heat load fluctuations within a predetermined temperature range (for example, within ±5°C). In other words, the hot water tank 83 functions as a buffer for heat load fluctuations.

[0067] A temperature sensor 830 for measuring the temperature of the heat medium is disposed inside the hot water tank 83. The measurement result of the temperature sensor 830 is output to the control device 90. The hot water tank 83 is connected to the heat source device 81 via a hot water side heat source supply line 221 and a hot water side heat source return line 222.

[0068] The hot water side heat source supply line 221 is a path through which the heat medium flows from the hot water tank 83 to the heat source device 81. A valve 301, a hot water side circulation water pump 831, a flow rate sensor 231, and a temperature sensor 232 are arranged in this order from upstream to downstream on the hot water side heat source supply line 221. The hot water side circulation water pump 831 is configured, for example, by a centrifugal pump or the like, and circulates the heat medium between the hot water tank 83 and the heat source device 81. The flow rate sensor 231 measures the flow rate of the heat medium flowing into the heat source device 81 and outputs the measurement result to the control device 90. The temperature sensor 233 measures the temperature of the heat medium flowing into the heat source device 81 and outputs the measurement result to the control device 90.

[0069] The hot water side heat source return line 222 is a path through which the heat medium flows from the heat source device 81 to the hot water tank 83. A temperature sensor 233 and a valve 302 are arranged in this order from upstream to downstream on the hot water side heat source return line 222. The temperature sensor 233 measures the temperature of the hot water flowing out from the heat source device 81 and outputs the measurement result to the control device 90.

[0070] A hot water supply line 112a and a hot water return line 112b are connected to the hot water tank 83. A valve 305, a water filter 234, and a valve 306 are arranged on the hot water supply line 112a near the hot water tank 83. A valve 303 and a valve 304 are arranged on the hot water return line 112b.

[0071] The connection positions (port positions) of each line of the hot water tank 83 are preferably set in consideration of the temperature stratification of the heat medium (hot water) stored in the hot water tank 83. Figure 6 is a schematic diagram showing the connection positions of each line connected to the hot water tank 83.

[0072] 6, temperature stratification occurs in the hot water stored in the hot water tank 83, with the temperature increasing toward the upper layer and decreasing toward the lower layer. The connection positions of the lines in the hot water tank 83 are set to be, in order from highest to lowest, the hot water side heat source return line 222, the hot water supply line 112a, the hot water side heat source supply line 221, and the hot water return line 112b.

[0073] The hot water side heat source return line 222 is a pipe that returns hot water (e.g., 82°C) heated by the heat source device 81, and returns the hot water to the highest temperature part in the temperature stratification. The hot water return line 112a is connected to the next highest position after the connection position of the hot water side heat source return line 222, so the hot water heated by the heat source device 81 is sent to the upstream side of the module 11 while maintaining a high temperature (e.g., 80°C) without significantly decreasing its temperature.

[0074] The hot water side heat source supply line 221 is a pipe for sending hot water to be heated to the heat source device 81, and is connected at the next highest position after the connection position of the hot water supply line 112a. This allows high-temperature hot water to be sent through the hot water supply line 112a, while hot water maintained at a relatively high temperature (for example, 75°C) by the hot water side heat source supply line 221 can be sent to the heat source device 81. The hot water return line 112b is a pipe for returning hot water at a relatively lowest temperature (for example, 72°C) after heating the module 11. Because the hot water return line 112b is connected at the lowest position, it is possible to reduce the amount of low-temperature hot water mixed into the hot water supply line 112a, which requires a high temperature.

[0075] Next, returning to Fig. 5, the heat-source low-temperature water circuit 86 will be described. The heat-source low-temperature water circuit 86 circulates cold water between the cold water tank 82 and the heat source device 81. The heat-source low-temperature water circuit 86 includes the cold water tank 82, a cold water-side heat source supply line 121, and a cold water-side heat source return line 122.

[0076] The cold water tank 82 is a heat storage device that has a heat insulating function and can store a heat medium. The capacity of the cold water tank 82 is preferably at least five times the maximum flow rate discharged by the cold water circulation water pump 821, which will be described later. By setting the capacity of the cold water tank 82 to be large relative to the flow rate of the heat medium, it is possible to suppress temperature fluctuations of the cold water (heat medium) during heat load fluctuations within a predetermined temperature range (for example, within ±5°C). In other words, the cold water tank 82 functions as a buffer for heat load fluctuations.

[0077] A temperature sensor 820 for measuring the temperature of the heat medium is disposed inside the cold water tank 82. The measurement result of the temperature sensor 820 is output to the control device 90. The cold water tank 82 is connected to the heat source device 81 via a cold water side heat source supply line 121 and a cold water side heat source return line 122.

[0078] Chilled water-side heat source supply line 121 is a path through which the heat medium flows from chilled water tank 82 to heat source device 81. A valve 307, a chilled water-side circulation water pump 821, a flow rate sensor 131, and a temperature sensor 132 are arranged in chilled water-side heat source supply line 121. Chilled water-side circulation water pump 821 is configured, for example, by a centrifugal pump or the like, and circulates the heat medium between chilled water tank 82 and heat source device 81. Flow rate sensor 131 measures the flow rate of the heat medium flowing into heat source device 81 and outputs the measurement result to control device 90. Temperature sensor 132 measures the temperature of the heat medium flowing into heat source device 81 and outputs the measurement result to control device 90.

[0079] A radiator bypass line 123 for cooling the heat medium and a heater bypass line 124 for heating the heat medium are connected to the cold water side heat source supply line 121. The radiator bypass line 123 and the heater bypass line 124 are temperature adjustment circuits that adjust the temperature of the heat medium flowing into the heat source device 81 to an operable temperature when the outside air temperature or heat load fluctuates.

[0080] The radiator bypass line 123 is connected between the chilled water-side circulation water pump 821 and the flow rate sensor 131 in the chilled water-side heat source supply line 121. A valve 141 and a radiator fan 142 are arranged in the radiator bypass line 123. The valve 141 can open and close the flow path and adjust the flow rate based on control signals from the control device 90. The radiator fan 142 is a heat dissipation device that cools the heat medium passing through the radiator bypass line 123. The cooling of the heat medium by the radiator bypass line 123 is performed mainly during high temperatures such as in summer. By cooling the heat medium by the radiator bypass line 123, the temperature of the chilled water introduced into the heat source device 81 is controlled to be equal to or lower than a preset threshold value.

[0081] The heater bypass line 124 is located in the cold water-side heat source supply line 121 between the cold water-side circulation water pump 821 and the flow rate sensor 131, and is connected to the inside of the radiator bypass line 123. A valve 308 and a heater 150 are arranged in the heater bypass line 124. The heater 150 is driven by a control signal or a relay drive signal from the control device 90, and heats the heat medium flowing through the heater bypass line 124. The heating of the heat medium by the heater bypass line 124 is performed mainly when the temperature is low, such as during start-up in winter. By heating the heat medium by the heater bypass line 124, the temperature of the heat medium introduced into the heat source device 81 is controlled to be equal to or higher than a preset threshold value.

[0082] The chilled water side heat source return line 122 is a path through which the heat medium flows from the heat source device 81 to the chilled water tank 82. A temperature sensor 133, valves 309, 310, 311, and 312 are arranged in this order from upstream to downstream on the chilled water side heat source return line 122. The temperature sensor 132 measures the temperature of the chilled water flowing out from the heat source device 81 and outputs the measurement result to the control device 90.

[0083] A cold water supply line 111a and a cold water return line 111b are connected to the cold water tank 82. A valve 315, a water filter 134, and a valve 316 are arranged on the cold water supply line 111a near the cold water tank 82. A valve 313 and a valve 314 are arranged on the cold water return line 111b.

[0084] The connection positions (port positions) of each line of the chilled water tank 82 are preferably set in consideration of the temperature stratification of the heat medium (chilled water) stored in the chilled water tank 82. Figure 7 is a schematic diagram showing the connection positions of each line connected to the chilled water tank 82.

[0085] 7, the chilled water stored in the chilled water tank 82 is thermally stratified, with the temperature increasing toward the upper layer and decreasing toward the lower layer. The connection positions of the lines in the chilled water tank 82 are set to be, in order from highest to lowest, the chilled water return line 111b, the chilled water side heat source return line 122, the chilled water supply line 111a, and the chilled water side heat source supply line 121.

[0086] The chilled water return line 111b is a pipe that returns chilled water at a relatively highest temperature (e.g., 36°C) after cooling the module 11. Because the chilled water return line 111b is connected at the highest position, it is possible to prevent high-temperature chilled water from mixing with the chilled water sent out from the chilled water supply line 111a. The chilled water side heat source return line 122 is a pipe that returns chilled water (e.g., 30°C) cooled by the heat source device 81, and is connected at the next highest position after the connection position of the chilled water return line 111b. The chilled water that returns through the chilled water side heat source return line 122 moves to the lower side of the temperature stratification.

[0087] The chilled water supply line 111a is connected to the next highest position after the connection position of the chilled water side heat source return line 122, and therefore sends out the chilled water cooled in the heat source device 81 to the upstream side of the module 11 while maintaining a low temperature (for example, 31°C) without significantly increasing the temperature. The chilled water side heat source supply line 121 is connected to the lowest position, and sends out to the heat source device 81 chilled water at a low temperature (for example, 33°C) that was not sent from the chilled water supply line 111a to the module 11.

[0088] Next, returning to FIG. 5, the equipment heat recovery circuit 87 that cools the target equipment such as the intercooler 64, the vacuum pump 62, and the carbon dioxide recovery pump 63 included in the heat source low-temperature water circuit 86 and increases the temperature of the heat medium will be described.

[0089] The equipment heat recovery circuit 87 is connected in parallel to the heat-source low-temperature water circuit 86. The equipment heat recovery circuit 87 of this embodiment includes a first equipment heat cooling line 126 that exchanges heat with the intercooler 64, and a second equipment heat cooling line 127 that exchanges heat with the vacuum pump 62 and the carbon dioxide recovery pump 63.

[0090] The first equipment thermal cooling line 126 has its upstream end connected to the chilled water side heat source return line 122 and its downstream end connected to the chilled water side heat source supply line 121. In this embodiment, the connection point of the upstream end of the first equipment thermal cooling line 126 is between valves 309 and 310 on the chilled water side heat source return line 122. The connection point of the lower end of the first equipment thermal cooling line 126 is between valve 307 on the chilled water side heat source supply line 121 and chilled water side circulation water pump 821.

[0091] The first equipment heat cooling line 126 is connected to the intercooler 64 that generates steam condensation heat, and cools the intercooler 64 with cold water to recover the steam condensation heat as waste heat. The cold water is heated by heat exchange with the intercooler 64 and then sent to the cold water side heat source supply line 121.

[0092] A flow rate sensor 841 and a temperature sensor 842 are arranged upstream of the intercooler 64 on the first equipment thermal cooling line 126, and a temperature sensor 843 and a valve 317 are arranged downstream of the intercooler 64. The flow rate sensor 841 measures the flow rate of the heat medium before heat exchange with the intercooler 64 and outputs the measurement result to the control device 90. The temperature sensor 842 measures the temperature of the heat medium before heat exchange with the intercooler 64 and outputs the measurement result to the control device 90. The temperature sensor 843 measures the temperature of the heat medium after heat exchange with the intercooler 64 and outputs the measurement result to the control device 90.

[0093] The second equipment thermal cooling line 127 has its upstream end connected to the chilled water side heat source return line 122 and its downstream end connected to the chilled water side heat source supply line 121. In this embodiment, the connection point of the upstream end of the second equipment thermal cooling line 127 is between the valves 310 and 311 on the chilled water side heat source return line 122. The connection point of the lower end of the second equipment thermal cooling line 127 is between the valve 307 on the chilled water side heat source supply line 121 and the chilled water side circulation water pump 821, which is upstream of the connection point of the downstream end of the first equipment thermal cooling line 126.

[0094] Moreover, the second equipment thermal cooling line 127 of this embodiment includes a first branch line 127a for cooling the vacuum pump 62 and a second branch line 127b for cooling the carbon dioxide capture pump 63.

[0095] The first branch line 127a is connected to the vacuum pump 62 and uses cold water to cool the vacuum pump 62. The heat medium is heated by heat exchange with the vacuum pump 62 and then merges with the second branch line 127b, and is sent to the cold water side heat source supply line 121.

[0096] A flow rate sensor 851 and a temperature sensor 852 are arranged upstream of the vacuum pump 62 on the first branch line 127a, and a temperature sensor 853 is arranged downstream of the vacuum pump 62. The flow rate sensor 851 measures the flow rate of the heat medium before heat exchange with the vacuum pump 62 and outputs the measurement result to the control device 90. The temperature sensor 852 measures the temperature of the heat medium before heat exchange with the vacuum pump 62 and outputs the measurement result to the control device 90. The temperature sensor 853 measures the temperature of the chilled water after heat exchange with the vacuum pump 62 and outputs the measurement result to the control device 90.

[0097] The second branch line 127b is connected to the carbon dioxide capture pump 63 and uses a heat medium to cool the carbon dioxide capture pump 63. The heat medium is heated by heat exchange with the carbon dioxide capture pump 63 and then merges with the first branch line 127a, and is sent to the chilled water side heat source supply line 121.

[0098] A flow rate sensor 861 and a temperature sensor 862 are arranged on the second branch line 127b upstream of the carbon dioxide capture pump 63, and a temperature sensor 863 is arranged downstream of the carbon dioxide capture pump 63. The flow rate sensor 861 measures the flow rate of the heat medium before heat exchange with the carbon dioxide capture pump 63 and outputs the measurement result to the control device 90. The temperature sensor 862 measures the temperature of the heat medium before heat exchange with the carbon dioxide capture pump 63 and outputs the measurement result to the control device 90. The temperature sensor 863 measures the temperature of the heat medium after heat exchange with the carbon dioxide capture pump 63 and outputs the measurement result to the control device 90.

[0099] An equipment cooling pump 870 is disposed upstream of the branch point of the first branch line 127a and the second branch line 127b in the second equipment thermal cooling line 127. In addition, a valve 318 and a valve 319 are disposed downstream of the junction of the first branch line 127a and the second branch line 127b in the second equipment thermal cooling line 127.

[0100] The equipment cooling pump 870 of this embodiment is configured by a cascade pump having a sufficient head to pump the heat medium without being hindered by the high pressure loss of the vacuum pump 62 and the carbon dioxide capture pump 63, which are the equipment for which heat recovery is performed. The heat generated by driving the equipment cooling pump 870 is also recovered as exhaust heat by the cold water.

[0101] As described above, the equipment heat recovery circuit 87 recovers the heat of steam condensation from the intercooler 64 and the exhaust heat from the vacuum pump 62 and the carbon dioxide recovery pump 63 into a heat medium to cool the target equipment, and the heat recovery makes it possible to flow the heat medium into the heat source device 81 at a high temperature potential.

[0102] The equipment heat recovery circuit 87 uses the low-temperature heat medium cooled by the heat source device 81 to cool the target equipment, which are the vacuum pump 62, the carbon dioxide capture pump 63, and the intercooler 64. After cooling the target equipment (vacuum pump 62, carbon dioxide capture pump 63, and intercooler 64) and recovering the exhaust heat, the chilled water merges with the chilled water-side heat source supply line 121 through which chilled water discharged from the chilled water tank 82 (for example, a high-temperature location in the upper layer of the chilled water tank 82) flows, and is introduced into the heat source device 81. The chilled water after recovering the exhaust heat is heated to an appropriate temperature range.

[0103] In this embodiment, the cold water is further adjusted to an appropriate temperature range before entering the heat source device 81 by the radiator bypass line 123 for cooling the cold water or the heater bypass line 124 for heating the cold water, so that even in operations with large fluctuations in the heat load, it is possible to smooth out the heat fluctuations over time and keep the inflow temperature to the heat source device 81 constant.

[0104] Next, the configuration of the reservoir tank 88 will be described. The reservoir tank 88 is a tank capable of storing a heat medium. The reservoir tank 88 is connected to the hot water tank 83 and the cold water tank 82. A valve 320 is disposed between the reservoir tank 88 and the hot water tank 83, and another valve 321 is disposed between the reservoir tank 88 and the cold water tank 82. When the amount of heat medium stored in the hot water tank 83 needs to be adjusted, the valve 320 is opened, and the heat medium is transferred between the reservoir tank 88 and the hot water tank 83. Similarly, when the amount of heat medium stored in the cold water tank 82 needs to be adjusted, the valve 321 is opened, and the heat medium is transferred between the reservoir tank 88 and the cold water tank 82. A level sensor 880 for determining the amount of heat medium stored is disposed inside the reservoir tank 88. The measurement result of the level sensor 880 is output to the control device 90. The control device 90 uses the measurement result of the level sensor 880 to determine whether the reservoir tank 88 is usable or not.

[0105] <Flow control> Next, flow rate control by the control device 90 will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a graph showing the time changes in the adsorbent temperature and the heat medium flow rate (hot water flow rate) in the desorption process. Fig. 9 is a graph showing the time changes in the heat exchange amount in the desorption process.

[0106] 8, the control device 90 controls the apertures of the three-way valves 30a and 30b to be large so that the flow rate is high in the early stage of the desorption process, when the processing heat load is high. This allows the temperature of the adsorbent 12 to be raised early, thereby promoting desorption. For example, in the early stage of temperature increase in the early stage of the desorption process, the control device 90 controls the apertures of the three-way valves 30a and 30b so that the maximum flow rate is about 30 L / min.

[0107] From the middle of the desorption process onwards, the heat treatment load decreases, so the apertures of the three-way valves 30a and 30b are controlled to be small so that the flow rate is relatively small. For example, during the temperature maintenance stage from the middle of the desorption process onwards, the control device 90 controls the apertures of the three-way valves 30a and 30b so that the flow rate is reduced to about 10 L / min so that the temperature difference between the inlet and outlet temperatures of the hot water is about 3°C. This allows the amount of heat exchange from the middle of the desorption process onwards to be reduced, and overall energy loss to be reduced, as shown in Figure 9.

[0108] The timing for changing the flow rate at the beginning and middle stages of the desorption process can be determined based on the inlet temperature of the hot water detected by the temperature sensor 35, the outlet temperature of the hot water detected by the temperature sensor 36, and the adsorbent temperature of the adsorbent 12 detected by the temperature sensor 27. For example, the control device 90 adjusts the flow rate using the three-way valves 30a and 30b by utilizing the temperature difference between the inlet and outlet temperatures of the hot water, the hot water outlet temperature threshold, the passage of time, etc.

[0109] In this embodiment, the valves 301 to 321 are configured to be automatically controlled by the control device 90, but if automatic control is not required, manual valves may be used.

[0110] As described above, the carbon dioxide capture device 1 of this embodiment includes a plurality of modules 11 having adsorbents 12 therein, each of which performs an adsorption step of sucking a gas containing carbon dioxide into the adsorbent 12 to adsorb the carbon dioxide, and a desorption step of heating the adsorbent 12 in a state where the atmosphere around the adsorbent 12 is reduced in pressure to desorb the carbon dioxide from the adsorbent 12; a heat exchanger 70 capable of performing heating and cooling by supplying hot water (heat medium) to each of the modules 11; and a three-way valve (flow path control unit) 30 capable of selectively supplying hot water or cold water to the module 11. The heat exchanger 70 includes a heat pump type heat source 81 that heats hot water and cools cold water, and a heat source 81 a heat source low-temperature water circuit 86 including a cold water tank (heat medium tank for cooling) 82 for storing cold water cooled by the heat source device 81 and circulating cold water between the cold water tank 82 and the heat source device 81; a hot water supply line 112a for supplying hot water from the hot water tank 83 to the module 11; a hot water return line 112b for returning the hot water after heating in the module 11 to the hot water tank 83; a cold water supply line 111a for supplying cold water from the cold water tank 82 to the module 11;

[0111] This allows the timing of the adsorption and desorption processes to be staggered among multiple modules 11, thereby preventing the processing load from concentrating at one time. Furthermore, the hot water tank 83 and cold water tank 82 function as buffers against heat fluctuations, preventing deterioration in temperature tracking due to fluctuations in the required heat amount, improving equipment efficiency and reducing power consumption. The amount of heat generated by the heat source device 81 and the amount of waste heat recovered from the modules 11 and target equipment can also be kept constant, enabling a continuous and stable supply of hot heat, unlike conventional technology in which the heat load varies greatly between day and night. Furthermore, because the hot water tank 83 is constantly heated by the heat source device 81 and the cold water tank 82 is constantly cooled by the heat source device 81, the temperature range of the hot water or cold water can be maintained within a constant range without deviating from the required temperature range over time.

[0112] In addition, the three-way valves 30a and 30b of this embodiment are configured to be able to control the flow paths for each of the modules 11, and supply cold water to the module 11 performing the adsorption process, and supply hot water to the module 11 performing the desorption process.

[0113] This makes it possible to control the three-way valve 30a located upstream of each module 11 and the three-way valve 30b located downstream of each module 11 so as to synchronize with the operating state of each of the multiple modules 11, thereby minimizing the mixing of hot and cold water and reducing the loss of thermal energy.

[0114] Furthermore, the three-way valve 30a and the three-way valve 30b of this embodiment are configured to be able to adjust the flow rate of cold water or hot water supplied to the module 11.

[0115] This allows the flow rate of the heat transfer medium to be controlled according to the required temperature range and operating conditions, allowing for more precise control according to the actual conditions and further improving energy efficiency.

[0116] In addition, the three-way valves 30a and 30b of this embodiment control the flow rate of hot water to be relatively large during the initial stage of temperature increase in the desorption process, and to be relatively small during the temperature maintenance stage after the initial stage of temperature increase.

[0117] As a result, during the temperature-raising stage, which requires a large amount of heat, the temperature of the adsorbent 12 can be raised to the predetermined temperature quickly using the required amount of heat, and after the initial temperature-raising stage has passed, the amount of hot water supplied is adjusted to be just enough to maintain the temperature. Since no more heat energy than necessary is supplied during the temperature-maintaining stage, the loss of heat energy throughout the entire desorption process is reduced, enabling more efficient operation.

[0118] In addition, the heat source high temperature water circuit 85 of this embodiment has a hot water side heat source supply line 221 that sends hot water from the hot water tank 83 to the heat source device 81, and a hot water side heat source return line 222 that returns hot water from the heat source device 81 to the hot water tank 83, and the connection positions of each line in the hot water tank 83 are set to be in the order of hot water side heat source return line 222, hot water supply line 112a, hot water side heat source supply line 221, and hot water return line 112b from top to bottom.

[0119] This allows the hot water inflow and outflow positions to be set according to the temperature stratification of the hot water tank 83, making it possible to efficiently supply hot water at an appropriate temperature range while reducing the energy required to generate heat.

[0120] In addition, the heat source low-temperature water circuit 86 of this embodiment has a cold water side heat source supply line 121 that sends cold water from the cold water tank 82 to the heat source device 81, and a cold water side heat source return line 122 that returns cold water from the heat source device 81 to the cold water tank 82, and the connection positions of each line of the cold water tank 82 are set to be in the order of cold water return line 111b, cold water side heat source return line 122, cold water supply line 111a, and cold water side heat source supply line 121 from top to bottom.

[0121] This allows the inflow and outflow positions of the cold water to be set according to the temperature stratification of the cold water tank 82, making it possible to efficiently supply cold water at an appropriate temperature range while reducing the energy required to generate cold energy.

[0122] In the above embodiment, the module 11 is configured to be connected to another module 11 via the bypass path 31 in which the bypass valve 32 is disposed, but this configuration is not limited to this. The bypass path 31 and the bypass valve 32 may also be omitted from the configuration of the above embodiment.

[0123] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and modifications. Furthermore, the effects described in the above embodiments are merely preferred effects, and the present invention is not limited to those described in the above embodiments. [Explanation of symbols]

[0124] 1. Carbon dioxide capture device 11 Modules 12 Adsorbent 62 Vacuum pump 63 Carbon dioxide capture pump 64 Intercooler 70 Heat exchange equipment 80 Heat source circuit 81 Heat source device 82 Cold water tank (cooling heat medium tank) 83 Hot water tank (heating medium tank) 85 Heat source high temperature water circuit 86 Heat source low temperature water circuit 87 Equipment heat recovery circuit 90 Control device 111 Chilled water line (cooling heat medium line) 111a Chilled water line (cooling heat medium line) 111b Cold water return line (cooling heat medium return line) 112 Hot water line (heating medium line) 112a Hot water line (heating medium line) 112b Hot water return line (heating medium return line)

Claims

1. a plurality of modules each having an adsorbent therein, each performing an adsorption step of sucking a gas containing carbon dioxide into the adsorbent to adsorb the carbon dioxide, and a desorption step of heating the adsorbent under a reduced pressure around the adsorbent to desorb the carbon dioxide from the adsorbent; a heat exchanger capable of supplying a heat medium for heating to each of the modules and supplying a heat medium for cooling to each of the modules; a flow path control unit capable of selectively supplying the heating medium or the cooling medium to the module; Equipped with The heat exchange device is a heat pump type heat source device that heats the heating heat medium and cools the cooling heat medium; a heat source high-temperature water circuit including a heating heat medium tank that stores the heating heat medium heated by the heat source device, and circulating the heating heat medium between the heating heat medium tank and the heat source device; a heat source low-temperature water circuit including a cooling heat medium tank that stores the cooling heat medium cooled by the heat source device, and circulating the cooling heat medium between the cooling heat medium tank and the heat source device; a heating medium supply line for supplying the heating medium from the heating medium tank to the module; a heating medium return line that returns the heating medium after heating the module to the heating medium tank; a cooling heat medium supply line for supplying the cooling heat medium from the cooling heat medium tank to the module; a cooling heat medium return line that returns the cooling heat medium to the cooling heat medium tank after cooling the module; having Carbon dioxide capture equipment.

2. The flow path control unit A flow path is controllable for each of the modules; supplying the cooling heat medium to the module that performs the adsorption step; The heating medium is supplied to the module that performs the desorption step. The carbon dioxide capture device according to claim 1 .

3. The flow path control unit The flow rate of the cooling heat medium or the heating heat medium supplied to the module is adjustable. The carbon dioxide capture device according to claim 2 .

4. The flow path control unit In the initial stage of the temperature rise in the desorption process, the flow rate of the heating medium is relatively increased, In the temperature maintaining stage after the initial temperature increasing stage, the flow rate of the heating heat medium is controlled to be relatively small. The carbon dioxide capture device according to claim 3 .

5. The heat source high temperature water circuit a heating medium-side heat source supply line for transmitting the heating medium from the heating medium tank to the heat source device; a heating medium side heat source return line that returns the heating medium from the heat source device to the heating medium tank, The connection positions of the lines of the heating heat medium tank are set so that, from top to bottom, the heating heat medium side heat source return line, the heating heat medium supply line, the heating heat medium side heat source supply line, and the heating heat medium return line are in this order. The carbon dioxide recovery device according to any one of claims 1 to 4.

6. The heat source low-temperature water circuit includes: a cooling heat medium side heat source supply line for transmitting the cooling heat medium from the cooling heat medium tank to the heat source device; a cooling heat medium side heat source return line that returns the cooling heat medium from the heat source device to the cooling heat medium tank, The connection positions of the respective lines of the cooling heat medium tank are set so that, from top to bottom, the cooling heat medium return line, the cooling heat medium side heat source return line, the cooling heat medium supply line, and the cooling heat medium side heat source supply line are in this order. The carbon dioxide recovery device according to any one of claims 1 to 4.

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