Collection system

Abstract

The system appropriately notifies the user of the status of the collection system. [Solution] The recovery system of the present disclosure comprises a vehicle body, an engine mounted on the vehicle body, a recovery device mounted on the vehicle body that recovers CO2 in exhaust gas discharged from the engine using an adsorbent, and a control unit that outputs an indication of the deterioration of the adsorbent to a display device.

Description

Technical Field

[0001] The present disclosure relates to a recovery system.

Background Art

[0002] Towards the realization of a carbon-neutral society, vehicles equipped with carbon dioxide (CO2) recovery devices that emit from internal combustion engines and the like have been developed. For example, the CO2 recovery system installed in the vehicle of Patent Document 1 passes the exhaust gas generated by the internal combustion engine through a CO2 separation membrane and separates it into a CO2-rich separation gas and a residual gas. Then, the separation gas that has passed through the CO2 separation membrane is sent to a CO2 storage device, and the CO2 contained in the separation gas is stored by physically adsorbing it with an adsorbent such as zeolite, and the residual gas that has not passed through the CO2 separation membrane is discharged outside the vehicle through a muffler.

[0003] Here, in Patent Document 1, when the CO2 storage amount of all the storage cells included in the CO2 storage device exceeds a predetermined reference storage amount, a notification image including a statement such as "The CO2 storage amount has reached the standard." is displayed to the driver of the vehicle. As a result, the driver can go to a recovery spot such as a gas station at an appropriate time and release the CO2 in the storage cell. In Patent Document 1, the flow rate of the gas from the CO2 separation membrane to the storage cell is detected, and based on this flow rate, the CO2 storage amount in the storage cell is detected on the premise that the CO2 concentration in the exhaust gas is constant.

[0004] In addition, since the CO2 separation membrane is exposed to the exhaust gas, the CO2 recovery ability decreases due to membrane contamination when used repeatedly. Therefore, in the CO2 recovery system of Patent Document 2, when the CO2 recovery ability by the CO2 separation membrane does not recover even after cleaning the CO2 separation membrane, a notification image including a statement such as "The aging deterioration of the CO2 separation membrane has progressed. Please replace the CO2 separation membrane." is displayed to the driver of the vehicle. In Patent Document 2, the concentration of CO2 is detected by a CO2 concentration sensor installed in the downstream space of the CO2 separation membrane.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2024-22739 [Patent Document 2] Japanese Patent Publication No. 2024-73822 [Overview of the project] [Problems that the invention aims to solve]

[0006] Patent documents 1 and 2 describe a membrane separation method using a CO2 separation membrane to separate and recover CO2. While the membrane separation method has the advantage of being able to achieve CO2 separation with a relatively simple configuration, it also has disadvantages such as low purity of separated CO2, with a large amount of CO2 remaining in the residual gas; the separation membrane is easily degraded by oil-containing gases; and there are limitations on the volume of gas that can pass through the membrane, making it unsuitable for large-volume exhaust gas treatment.

[0007] Therefore, the inventors focused on physical adsorption, which uses an adsorbent, as an on-board CO2 recovery system. In physical adsorption, CO2 is separated from exhaust gas by passing exhaust gas through a porous adsorbent and physically adsorbing the CO2 onto the adsorbent. Physical adsorption has advantages such as being less prone to degradation compared to separation membranes and being able to keep the CO2 concentration of the residual gas low due to the high purity of the separation.

[0008] On the other hand, on-board CO2 capture systems using physical adsorption methods are still under development, and improvements are needed to enable more continuous use of the capture system. In this regard, technology that notifies users of the status of the capture system is particularly important for the proper use of the capture system.

[0009] Therefore, in view of the aforementioned conventional problems, this disclosure aims to provide a collection system that can suitably notify the user of the status of the collection system. [Means for solving the problem]

[0010] The recovery system of this disclosure comprises a vehicle body, an engine mounted on the vehicle body, a recovery device mounted on the vehicle body that recovers CO2 from exhaust gas emitted from the engine using an adsorbent that physically adsorbs and releases CO2, and a control unit that outputs an indication of the deterioration of the adsorbent to a display device. [Effects of the Invention]

[0011] According to this disclosure, the status of the recovery system can be suitably notified to the user. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a diagram illustrating the overall configuration of the recovery system according to the embodiment. [Figure 2] Figure 2 is a schematic diagram illustrating the internal configuration of the recovery device according to the embodiment. [Figure 3] Figure 3 is a flowchart illustrating the flow of exhaust gas. [Figure 4] Figure 4 is a flowchart illustrating the flow of recovered gas. [Figure 5] Figure 5 is a schematic diagram illustrating the internal structure of the dehumidifier. [Figure 6] Figure 6 is a schematic diagram illustrating the internal structure of the adsorption section. [Figure 7] Figure 7 is a flowchart illustrating the output processing flow in the control unit. [Figure 8] Figure 8 shows an example of a replacement indicator. [Figure 9] Figure 9 shows an example of a replacement procedure display. [Figure 10] Figure 10 shows an example of a preliminary marking. [Figure 11] Figure 11 is a schematic diagram illustrating the detection unit and image data related to a modified example. [Figure 12] Figure 12 shows an example of a replacement marking related to a modified example. [Modes for carrying out the invention]

[0013] [Summary of Embodiment] Embodiments of the present disclosure mainly include the following configurations.

[0014] (1) The recovery system of the present disclosure includes a vehicle body, an engine mounted on the vehicle body, a recovery device mounted on the vehicle body for recovering CO2 in the exhaust gas discharged from the engine by physically adsorbing and releasing it with an adsorbent, and a control unit that outputs a display regarding the deterioration of the adsorbent to a display device.

[0015] By configuring in this way, the deterioration state of the adsorbent, which is a consumable included in the recovery device, can be displayed to the user, and the state of the recovery system can be suitably notified to the user.

[0016] (2) In the recovery system of (1) above, a detection unit for detecting the deterioration of the adsorbent is further provided, and the control unit may output a display regarding the deterioration of the adsorbent according to the detection result of the detection unit.

[0017] By configuring in this way, according to the detection result of the detection unit, the deterioration state of the adsorbent can be displayed to the user.

[0018] (3) In the recovery system of (2) above, the detection unit may detect the deterioration caused by the repeated adsorption and release of CO2 by the adsorbent.

[0019] The detection unit detects the deterioration caused by the repeated adsorption and release of CO2 (regeneration cycle) in the adsorbent. By configuring in this way, the deterioration of the adsorbent used in the physical adsorption method can be detected.

[0020] (4) In the recovery system of (2) above, the detection unit may include a concentration sensor for measuring the CO2 concentration of at least one of the inflowing gas flowing into the adsorbent and the outflowing gas flowing out of the adsorbent.

[0021] This allows the detection unit to detect the degradation state of the adsorbent based on the concentration sensor. Since the quality of the adsorbent depends on its CO2 adsorption capacity, the concentration sensor allows for a more direct evaluation of the adsorbent's degradation state.

[0022] (5) In the recovery system described in (4) above, the detection unit includes a first concentration sensor for measuring the CO2 concentration of the incoming gas and a second concentration sensor for measuring the CO2 concentration of the outgoing gas, and the control unit may output a display to the display device indicating that the adsorbent should be replaced when the difference between the CO2 concentration measured by the first concentration sensor and the CO2 concentration measured by the second concentration sensor is smaller than a predetermined first threshold.

[0023] This allows the control unit to determine the degradation state of the adsorbent based on the difference in CO2 concentration.

[0024] (6) In the recovery system described in (2) above, the detection unit may include a camera that images at least one of the adsorbent material and the vicinity of the adsorbent material.

[0025] This allows the detection unit to detect the deterioration state of the adsorbent based on the image data captured by the camera.

[0026] (7) In the recovery system described in (6) above, the control unit may output a display indicator to the display device indicating that the adsorbent should be replaced if, in the image data captured by the camera of the adsorbent, at least one of the following conditions is met: the brightness of the adsorbent is more than a predetermined degree away from the reference brightness; the color difference between the color of the adsorbent and the reference color is greater than a predetermined color difference; and there is a crack in the adsorbent.

[0027] With this configuration, the control unit can determine the deterioration state of the adsorbent based on discoloration and cracks in the adsorbent.

[0028] (8) In the recovery system described in (6) above, the control unit may output a display message to the display device indicating that the adsorbent should be replaced if, in the image data captured by the camera of at least one of the adsorbent and the vicinity of the adsorbent, at least one of the following conditions is met: the number of fragments of the adsorbent exceeds a predetermined number, and the total number of pixels indicating the fragments of the adsorbent exceeds a predetermined number.

[0029] With this configuration, the control unit can determine the deterioration state of the adsorbent based on the degree of damage to the adsorbent.

[0030] (9) In the recovery system described in (2) to (8) above, the detection unit may detect the operating time of the recovery device, and the control unit may output a display to the display device indicating that the adsorbent should be replaced if the operating time detected by the detection unit exceeds a predetermined time.

[0031] With this configuration, the detection unit can detect the deterioration state of the adsorbent based on the operating time of the recovery device.

[0032] (10) In the recovery systems described in (2) to (9) above, the recovery device further comprises a dehumidifier that adsorbs moisture in the exhaust gas, the dehumidifier is provided upstream of the adsorbent in the flow path of the exhaust gas, and may contain the same material as the adsorbent.

[0033] This configuration allows the degraded adsorbent to be reused as a dehumidifier, and consumables in the recovery device can be used efficiently.

[0034] (11) In the recovery system described in (10) above, the control unit may output to the display device a display indicating that the deteriorated adsorbent is to be used as the dehumidifier, depending on the detection result of the detection unit.

[0035] By configuring it in this way, users can be informed that the adsorbent material can be reused as a dehumidifier.

[0036] (12) In the recovery systems described in (2) to (11) above, the control unit may output a replacement indicator to the display device indicating that the adsorbent should be replaced when the detection unit detects a predetermined deterioration state of the adsorbent, and when the detection unit detects a preliminary state of the adsorbent in which the degree of deterioration is lower than the predetermined deterioration state, it may predict a replacement time in which the predetermined deterioration state can be detected and output a preliminary indicator to the display device indicating the replacement time before outputting the replacement indicator.

[0037] This allows users to be notified in advance when it is time to replace the adsorbent, enabling them to perform maintenance and inspections on the recovery device at appropriate times, thus promoting more appropriate use of the recovery system by users.

[0038] [Details of the embodiment] The embodiments of this disclosure will be described in detail below with reference to the drawings.

[0039] [Overall configuration of collection system 1] Figure 1 is a diagram illustrating the overall configuration of the recovery system 1 according to the embodiment. The recovery system 1 is a system mounted on vehicle V1 and comprises vehicle V1 (vehicle body), engine 10, recovery device 11, and control unit 12.

[0040] The recovery device 11 is a device that recovers carbon dioxide (hereinafter referred to as "CO2") from the exhaust gas emitted from the engine 10 of the vehicle V1 and releases the treated gas with reduced CO2 concentration into the atmosphere from the exhaust pipe 14. The recovery device 11 is a physical adsorption type recovery device that includes an adsorbent material that physically adsorbs CO2 from the exhaust gas. The internal configuration of the recovery device 11 will be described later.

[0041] The control unit 12 outputs the status of the recovery device 11 to at least one of the display devices 13 and 15. The control unit 12 is a computer device that includes a processor such as a CPU (Central Processing Unit) and memory such as RAM (Random Access Memory), and performs various information processing based on the computer program read into the memory. The control unit 12 further includes auxiliary storage devices including non-volatile memory such as an HDD (Hard Disk Drive) and an SSD (Solid State Drive), and a communication device for communicating with the display devices 13 and 15. Computer programs, various parameters, and data are pre-stored in the auxiliary storage devices.

[0042] Vehicle V1 is not particularly limited, but could be an agricultural vehicle such as a tractor or construction machinery (collectively referred to as "working vehicles"). Working vehicles require a power source not only for vehicle V1 itself, but also for working machinery such as a rotary tiller for tilling the soil. Therefore, higher-output engines 10 (internal combustion engines) are mainly used, and there are still obstacles to electrification (EV conversion). For this reason, especially for working vehicles, the development and dissemination of CO2 capture technology from engines 10, in parallel with electrification, is considered particularly important in order to achieve carbon neutrality.

[0043] For the widespread adoption of the recovery system 1, it is preferable to make it a user-friendly system. For example, by displaying the deterioration status and replacement timing of consumables (such as the adsorbent described later) included in the recovery device 11 to the user, the status of the recovery system 1 can be appropriately notified to the user. As a result, the user can perform maintenance and inspection of the recovery device 11 at appropriate times, thereby encouraging more appropriate use of the recovery system 1 by the user.

[0044] Therefore, the recovery system 1 informs the user of the status of the recovery device 11 by having the control unit 12 output the status of the recovery device 11 to at least one of the display devices 13 and 15. The status of the recovery device 11 that the control unit 12 outputs to the display devices 13 and 15 includes, for example, the status related to the deterioration of the adsorbent (in particular, the deterioration of the adsorbent due to repeated adsorption and release of CO2), as described later.

[0045] The display device 13 is a device mounted on the vehicle V1, and is, for example, an in-vehicle display and speaker. The display device 13 is electrically connected to the control unit 12 by, for example, a communication line, and informs the user, such as the driver U1 of the vehicle V1, of the status of the recovery device 11 by displaying an appropriate information based on the output signal from the control unit 12.

[0046] The display device 15 is a device located outside the vehicle V1 and is, for example, a portable terminal owned by a user such as the vehicle V1 administrator U2. The display device 15 is, for example, a smartphone, tablet, laptop, or desktop computer and is equipped with a display and a speaker. The display device 15 communicates wirelessly with the control unit 12 and informs the user, such as the administrator U2, of the status of the recovery device 11 by displaying an appropriate information based on the output signal transmitted from the control unit 12.

[0047] [Internal configuration of the recovery device 11] Figure 2 is a schematic diagram illustrating the internal configuration of the recovery device 11 according to the embodiment. The recovery device 11 includes a first heat exchanger 201 and a second heat exchanger 202 for cooling exhaust gas discharged from the engine 10, a first dehumidification unit 211 and a second dehumidification unit 212 for removing moisture from the cooled exhaust gas, a first adsorption unit 221 and a second adsorption unit 222 for removing CO2 from the dehumidified exhaust gas, a third heat exchanger 203 for heating the exhaust gas after CO2 removal (hereinafter referred to as "processed gas"), a heat exchanger 231 for cooling the gas containing CO2 desorbed from the first adsorption unit 221 and the second adsorption unit 222 (hereinafter referred to as "recovered gas"), a compressor 232 for compressing and transporting the recovered gas from the heat exchanger 231 to the recovery unit 233, and a recovery unit 233 for recovering the CO2 contained in the recovered gas as compressed gas.

[0048] Furthermore, the recovery device 11 includes pipes 271 to 277 connecting these parts, and switching valves 281 to 287 for switching the connection state of these pipes 271 to 277. In addition, the recovery device 11 includes a hot water pipe 261 for appropriately heating these parts, a cooling water pipe 262 for appropriately cooling these parts, and a pump 251 for supplying water to the hot water pipe 261 and the cooling water pipe 262.

[0049] The hot water pipe 261 is a water pipe through which hot water, pressurized by the pump 251, flows. The cooling water pipe 262 is a water pipe through which cooling water, which is at a lower temperature than the hot water flowing through the hot water pipe 261, flows.

[0050] The recovery device 11 further includes a detection unit 240 for detecting the deterioration state of the adsorbent contained in the first adsorption unit 221 and the second adsorption unit 222.

[0051] [Flow of exhaust gas in the recovery device 11] Figure 3 is a flowchart illustrating the flow of exhaust gas. Below, the functions of each part (discharge route) of the recovery device 11 will be explained, referring to the figures as appropriate, along with the flow of exhaust gas.

[0052] First, exhaust gas is discharged from engine 10 (step S11). Exhaust gas is the emissions generated by burning fuel such as gasoline, diesel fuel, or liquefied petroleum gas (LPG), and mainly contains CO2 and water vapor.

[0053] The exhaust gas discharged from the engine 10 passes through the piping 271, through the first heat exchanger 201 and the second heat exchanger 202, and reaches the switching valve 281. The first heat exchanger 201 and the second heat exchanger 202 cool the high-temperature exhaust gas discharged from the engine 10 in two stages (step S12).

[0054] The exhaust gas emitted from the engine 10 is extremely hot, and if it were to flow into the first dehumidifier 211 or the second dehumidifier 212 at that temperature, the first dehumidifier 211 or the second dehumidifier 212 may be damaged. For this reason, the exhaust gas is passed through the first heat exchanger 201 via the hot water pipe 261 to temporarily lower the temperature of the exhaust gas to a certain level, and then the exhaust gas is passed through the second heat exchanger 202 via the cooling water pipe 262 to further lower the temperature of the exhaust gas.

[0055] Piping 271 is branched into two pipes 272, and a switching valve 281 selectively connects to one of the two pipes 272. One of the two pipes 272 passes through the first dehumidification unit 211, and the other passes through the second dehumidification unit 212. Hereinafter, unless otherwise specified, the first dehumidification unit 211 and the second dehumidification unit 212 will be referred to as "dehumidification unit 210".

[0056] The cooled exhaust gas passes through the dehumidification unit 210. The dehumidification unit 210 reduces the amount of moisture in the exhaust gas by adsorbing and removing moisture contained in the exhaust gas (step S13).

[0057] The switching valve 282 is installed in the confluence of two pipes 272 and selectively connects one of the two pipes 272 to the confluence. The confluence branch off into two pipes 273, and the switching valve 283 selectively connects one of the two pipes 273 to one of them. One of the two pipes 273 passes through the first adsorption section 221, and the other passes through the second adsorption section 222. Hereinafter, unless otherwise distinguished, the first adsorption section 221 and the second adsorption section 222 will be referred to as "adsorption section 220". Although Figure 2 shows an example in which the recovery device 11 has two adsorption sections 220, the number of adsorption sections 220 may be three or more.

[0058] The dehumidified exhaust gas passes through the adsorption unit 220. The adsorption unit 220 removes CO2 contained in the exhaust gas by adsorbing it, thereby reducing the amount of CO2 in the exhaust gas (step S14). As a result, the exhaust gas becomes a processed gas, and this processed gas flows through the piping 273 downstream of the adsorption unit 220.

[0059] Here, since the adsorbent material contained in the adsorption section 220 also has the property of absorbing moisture, if exhaust gas with a high moisture content is passed directly through the adsorption section 220, the adsorption section 220 will preferentially absorb moisture rather than CO2, hindering effective CO2 adsorption. For this reason, in the recovery device 11, the exhaust gas is passed through the dehumidification section 210 to remove moisture before being passed through the adsorption section 220. This prevents the CO2 adsorption capacity of the adsorption section 220 from being hindered by moisture absorption by the adsorbent material, allowing for effective CO2 adsorption in the adsorption section 220.

[0060] The switching valve 284 is installed in the confluence channel 274 of the two pipes 273, and selectively connects one of the two pipes 273 to the confluence channel 274. The confluence channel 274 passes through the third heat exchanger 203 and branches into two pipes 275.

[0061] A hot water tube 261 is passed through the third heat exchanger 203, and the process gas passing through the third heat exchanger 203 is heated by the hot water (step S15).

[0062] The switching valve 285 switches the connection between the confluence channel 274 and the two pipes 275. One of the two pipes 275 passes through the first dehumidification section 211, and the other passes through the second dehumidification section 212. The heated process gas passes through the dehumidification section 210. The dehumidification section 210 is heated by the process gas and releases moisture into the process gas (step S16). The dehumidification section 210 is heated not only by the process gas but also by the hot water flowing through the hot water pipe 261.

[0063] Here, while one of the first dehumidification unit 211 and the second dehumidification unit 212 is in communication with the piping 271 via the switching valve 281 and removing moisture from the exhaust gas (step S13), the other of the first dehumidification unit 211 and the second dehumidification unit 212 is in communication with the confluence passage 274 via the switching valve 285 and releasing moisture into the processed gas (step S16). In other words, the first dehumidification unit 211 and the second dehumidification unit 212 can continuously remove moisture from the exhaust gas by repeatedly and alternately performing moisture absorption (dehumidification operation) and moisture release (regeneration operation) via the switching valves 281 and 285.

[0064] The switching valve 286 is installed in the confluence passage 276 of the two pipes 275, and selectively connects one of the two pipes 275 to the confluence passage 276. The confluence passage 276 is connected to the exhaust stack 14. The processed gas, from which moisture has been supplied from the dehumidification unit 210, is released into the atmosphere through the confluence passage 276 and the exhaust stack 14 (step S17).

[0065] The above describes the flow of exhaust gas and treated gas. The exhaust gas undergoes cooling, dehumidification, and CO2 adsorption to become treated gas, which is then released into the atmosphere containing moisture released from the dehumidification unit 210 for regeneration.

[0066] [Flow of recovered gas in recovery device 11] Figure 4 is a flowchart illustrating the flow of recovered gas. Referring to each figure as appropriate, the functions of each part (recovery route) of the recovery device 11 will be explained along the flow of recovered gas recovered from the adsorption unit 220 to the recovery unit 233.

[0067] The recovery path 277 branches into two at the switching valve 287, one of which is connected to the first suction unit 221 and the other to the second suction unit 222. The switching valve 287 selectively switches the connection destination of the recovery path 277 to either the first suction unit 221 or the second suction unit 222.

[0068] First, in the adsorption section 220, the adsorbent material that has adsorbed CO2 is heated by hot water passing through the hot water pipe 261, thereby releasing CO2 from the adsorbent material (step S18).

[0069] The recovered gas containing CO2 released from the adsorption unit 220 passes through the recovery path 277, is cooled by the heat exchanger 231, compressed and transported by the compressor 232, and stored as compressed gas in the recovery unit 233 (step S19).

[0070] The recovery unit 233 is, for example, a cylinder for storing high-pressure gas. The recovery unit 233 may also store the recovered gas as liquefied carbon dioxide. The recovery unit 233 is detachably provided from the recovery path 277, so that CO2 can be continuously recovered, for example, when the recovery unit 233 is filled with recovered gas, the full recovery unit 233 can be removed and replaced with an empty recovery unit 233.

[0071] Here, while one of the first adsorption section 221 and the second adsorption section 222 is in communication with the piping 271 and 272 via the switching valve 283 and adsorbing CO2 from the exhaust gas (step S14), the other of the first adsorption section 221 and the second adsorption section 222 is in communication with the recovery passage 277 via the switching valve 287 and releases CO2 from the adsorbent (step S18). In other words, the first adsorption section 221 and the second adsorption section 222 can continuously remove CO2 from the exhaust gas by repeatedly and alternately performing CO2 adsorption (adsorption operation) and CO2 release (desorption operation) via the switching valves 283 and 287.

[0072] [Internal configuration of the dehumidifying unit 210] Figure 5 is a schematic diagram illustrating the internal configuration of the dehumidification unit 210. Note that the dehumidification unit 210 may also include devices for heating or cooling the desiccant material, in addition to those illustrated in Figure 5. Furthermore, the dimensions of each part in the schematic diagram of Figure 5 are exaggerated as appropriate, and the actual size relationships may differ.

[0073] The dehumidifying unit 210 includes a container 311, a first cassette 312, a second cassette 313, and a third cassette 314. These cassettes 312 to 314 are housed in the container 311. Pipes 272 and 275, a hot water pipe 261, and a cooling water pipe 262 pass through the container 311. The container 311 also has a first outlet 315 and a second outlet 316.

[0074] The first cassette 312 contains a desiccant containing synthetic zeolite. The first cassette 312 can be inserted into and removed from the container 311 via the first outlet 315. For example, the first cassette 312 can be replaced by removing a deteriorated first cassette 312 from the first outlet 315 and inserting a new first cassette 312 into the container 311 via the first outlet 315.

[0075] The second cassette 313 and the third cassette 314 each contain a desiccant containing silica gel. The second cassette 313 and the third cassette 314 can be inserted into and removed from the container 311 via the second outlet 316.

[0076] In the dehumidification section 210, the exhaust gas is passed through the third cassette 314, the second cassette 313, and the first cassette 312 in that order, allowing the moisture contained in the exhaust gas to be absorbed by the dehumidifying material in each cassette 312 to 314. This removes the moisture contained in the exhaust gas as described above (step S13).

[0077] Since synthetic zeolite has a higher moisture absorption capacity than silica gel and can absorb moisture even in low humidity conditions, passing the exhaust gas through the second cassette 313 and third cassette 314 containing silica gel first changes the exhaust gas from a high humidity state to a low humidity state, and then passing the low-humidity exhaust gas through the first cassette 312 containing synthetic zeolite makes it possible to obtain exhaust gas in an extremely low humidity state.

[0078] The cooling water pipe 262 cools these cassettes 312-314 in the dehumidification section 210 through which the exhaust gas passes. The cooling water passing through the cooling water pipe 262 does not directly come into contact with each cassette 312-314; only heat is conducted between the cooling water pipe 262 and each cassette 312-314. Reusable dehumidifying materials such as silica gel and synthetic zeolite have the property of improving their moisture absorption capacity at low temperatures and efficiently absorbing moisture, and releasing the absorbed moisture at high temperatures. Therefore, by cooling these cassettes 312-314 with the cooling water pipe 262, their moisture absorption capacity can be improved.

[0079] In the dehumidification section 210, the piping 275 passes the processed gas through the first cassette 312, the second cassette 313, and the third cassette 314 in that order, thereby releasing the moisture contained in each cassette 312 to 314 into the processed gas (step S16).

[0080] The hot water tube 261 heats these cassettes 312-314 in the dehumidification section 210 through which the processing gas passes. The hot water passing through the hot water tube 261 does not directly come into contact with each cassette 312-314; only the heat of the hot water is transferred to each cassette 312-314. By heating these cassettes 312-314 with the hot water tube 261, the absorbed moisture can be released, thereby regenerating the desiccant contained in these cassettes 312-314.

[0081] Furthermore, if the desiccant is a regenerative type in which absorbed moisture is released by heating, materials other than silica gel and synthetic zeolite may be used as the desiccant.

[0082] [Internal structure of the adsorption unit 220] Figure 6 is a schematic diagram illustrating the internal structure of the adsorption unit 220. The adsorption unit 220 includes a container 321 and a cassette 322 housed within the container 321. Pipes 273 and 277, a hot water pipe 261, and a cooling water pipe 262 are passed through the container 321. An outlet 323 is also formed in the container 321.

[0083] Cassette 322 contains an adsorbent material including synthetic zeolite. Cassette 322 can be inserted into and removed from container 321 via outlet 323. For example, a deteriorated cassette 322 can be removed from outlet 323 and a new cassette 322 can be inserted into container 321 through outlet 323 to replace it.

[0084] Cassette 322 has the same shape as the first cassette 312 (Figure 5), and cassette 322 removed from the suction unit 220 can be attached to the dehumidifying unit 210 via the first outlet 315 as the first cassette 312. Note that cassette 322 does not need to have the same shape as the first cassette 312, as long as it is compatible with the first cassette 312. For example, cassette 322 only needs to be able to pass through the first outlet 315 and be able to be attached to the mounting position of the first cassette 312 in the container 311.

[0085] In the adsorption section 220, the pipe 273 passes the exhaust gas through the cassette 322, causing the CO2 contained in the exhaust gas to be adsorbed onto the adsorbent material of the cassette 322. This removes the CO2 contained in the exhaust gas as described above (step S14).

[0086] The cooling water pipe 262 cools the cassette 322 in the adsorption section 220 through which the exhaust gas passes. The cooling water passing through the cooling water pipe 262 does not directly come into contact with the cassette 322; only heat is conducted between the cooling water pipe 262 and the cassette 322. Reusable adsorbents, such as synthetic zeolite, have the property of improving their adsorption capacity at low temperatures to efficiently adsorb CO2, and releasing the adsorbed CO2 at high temperatures. Therefore, by cooling the cassette 322 with the cooling water pipe 262, the adsorption capacity can be improved.

[0087] The hot water pipe 261 heats the cassette 322 in the adsorption section 220, where exhaust gas does not pass through. The hot water passing through the hot water pipe 261 does not directly come into contact with the cassette 322, and only the heat of the hot water is transferred to the cassette 322. By heating the cassette 322 with the hot water pipe 261, the adsorbed CO2 is released (step S18). This allows the adsorbent material contained in the cassette 322 to be regenerated. The released recovered gas is sent to the piping 277.

[0088] Furthermore, if the adsorbent is a regenerative type in which the adsorbed CO2 is released by heating, materials other than synthetic zeolite may be used as the adsorbent.

[0089] [Configuration of the detection unit 240] Refer to Figure 2. As described above, the recovery system 1 has a function to inform the user of the status of the recovery device 11. Specifically, the recovery system 1 detects the deterioration state of the adsorbent contained in the recovery device 11 and, based on this detection result, informs the user of when it is time to replace the adsorbent, etc. For this purpose, the recovery device 11 is equipped with a detection unit 240 that detects the deterioration state of the adsorbent.

[0090] The detection unit 240 includes a concentration sensor that measures the CO2 concentration of at least one of the inflow gas flowing into the adsorption unit 220 and the outflow gas flowing out from the adsorption unit 220. The inflow gas is exhaust gas flowing through the piping 273 (or piping 271, 272) upstream of the adsorption unit 220. The outflow gas is processed gas flowing through the piping 273 (or piping 274, 275, 276) downstream of the adsorption unit 220.

[0091] In the example shown in Figure 2, the detection unit 240 includes a first concentration sensor 241 located upstream of the first adsorption unit 221 in the piping 273 to measure the CO2 concentration of the inflow gas (exhaust gas), and a second concentration sensor 242 located downstream of the first adsorption unit 221 in the piping 273 to measure the CO2 concentration of the outflow gas (processed gas). This pair of sensors 241 and 242 is used to evaluate the difference (change) in CO2 concentration upstream and downstream of the first adsorption unit 221.

[0092] Furthermore, the detection unit 240 includes a first concentration sensor 243 located upstream of the second adsorption unit 222 in the piping 273 for measuring the CO2 concentration of the inflow gas (exhaust gas), and a second concentration sensor 244 located downstream of the second adsorption unit 222 in the piping 273 for measuring the CO2 concentration of the outflow gas (processed gas). These sensors 243 and 244 are used to evaluate the difference (change) in CO2 concentration upstream and downstream of the second adsorption unit 222.

[0093] The detection unit 240 is electrically connected to the control unit 12 and transmits a detection signal to the control unit 12 that includes the CO2 concentration values ​​measured by these sensors 241 to 244.

[0094] [Output processing flow by control unit 12] Figure 7 is a flowchart illustrating the output processing flow in the control unit 12. The control unit 12 outputs a predetermined display to the display device 13 (or display device 15) according to the detection result of the detection unit 240.

[0095] First, the control unit 12 acquires the detection results from the detection unit 240 (step S21). The detection results include, for example, the CO2 concentrations measured by each of the sensors 241 to 244.

[0096] Next, the control unit 12 determines whether or not the adsorbent contained in the adsorption unit 220 has deteriorated based on the detection results (deterioration determination: step S22). Specifically, the control unit 12 calculates the difference Y1 between the CO2 concentration C1 measured by the first concentration sensor 241 (hereinafter referred to as "inflow concentration C1") and the CO2 concentration C2 measured by the second concentration sensor 242 (hereinafter referred to as "outflow concentration C2") (Y1 = C1 - C2).

[0097] Here, as the adsorbent deteriorates due to repeated adsorption and release of CO2, for example, the CO2 adsorption capacity of the adsorbent decreases to a certain extent, the difference Y1 between the inflow concentration C1 and the outflow concentration C2 becomes smaller. Focusing on this point, the control unit 12 determines that the adsorbent contained in the first adsorption unit 221 is "deteriorated" if the difference Y1 is less than or equal to a predetermined first threshold Th1 (Y1 ≤ Th1). In this case, the control unit 12 outputs a display prompting the user to replace the adsorbent contained in the first adsorption unit 221 (a display indicating the replacement of the adsorbent) to the display devices 13 and 15 (step S23).

[0098] On the other hand, if the difference Y1 is greater than a predetermined first threshold Th1 (Y1 > Th1), the control unit 12 determines that there is "no deterioration" in the adsorbent contained in the first adsorption unit 221. In this case, the control unit 12 proceeds to the step of determining the preliminary state, which will be described later (step S24).

[0099] Similarly, the control unit 12 calculates the difference Y1 between the inflow concentration C1 measured by the first concentration sensor 243 and the outflow concentration C2 measured by the second concentration sensor 244. If the difference Y1 is less than or equal to a predetermined first threshold Th1, the control unit 12 determines that the adsorbent in the second adsorption unit 222 is "deteriorated". In this case, the control unit 12 outputs a message to the display devices 13 and 15 prompting the user to replace the adsorbent in the second adsorption unit 222. On the other hand, if the difference Y1 is greater than the predetermined first threshold Th1, the control unit 12 determines that the adsorbent in the second adsorption unit 222 is "not deteriorated" and proceeds to the step of determining the preliminary state.

[0100] Note that the control unit 12 may determine that there is deterioration when the difference Y1 is smaller than the first threshold Th1 (Y1 < Th1), and may determine that there is no deterioration when the difference Y1 is greater than or equal to the first threshold Th1 (Y1 ≥ Th1).

[0101] FIG. 8 is an example of the display output from the control unit 12 to the display devices 13 and 15 in step S23. This display (hereinafter referred to as the "replacement display") is displayed on the displays of the display devices 13 and 15. Hereinafter, without distinguishing between the first and the second, it will be simply described as the adsorption unit 220. In reality, the control unit 12 performs the replacement display for the adsorption unit 220 in which deterioration has been detected.

[0102] The replacement display includes a message window 401 and a status display window 402. The message window includes, for example, a character display indicating the replacement of the adsorbent, such as "Please replace the adsorbent", and a replacement procedure button 403 for transitioning to the replacement procedure display described later. By operating the display devices 13 and 15 and pressing the replacement procedure button 403 (for example, mouse click or touch on the touch panel), the user can switch the screen from the replacement display (FIG. 8) to the replacement procedure display (FIG. 9).

[0103] The status display window 402 is a window for displaying the current state of the adsorbent and the like. The status display window 402 includes a region 404 for displaying the inflow concentration C1 (for example, the current value X1 of the inflow concentration C1 is displayed), a region 405 for displaying the outflow concentration C2 (for example, the current value X2 of the outflow concentration C2 is displayed), a region 406 for displaying the difference Y1, a region 407 for displaying the state of the adsorbent in text, and a region 408 for displaying a time-series graph of the difference Y1. In FIG. 8, various concentrations such as C1, C2, and Y1 are shown in "ppm", but these values may be shown in other units. For example, various concentrations may be shown in "vol%".

[0104] Area 407 displays text indicating the state of the adsorbent, such as "The concentration difference fell below the threshold Th1 at time T1." By looking at the display in area 407, the user can understand the state of the adsorbent.

[0105] Area 408 displays a graph, for example, with the vertical axis representing the difference Y1 and the horizontal axis representing time. This graph displays the first threshold Th1, the time T1 at which the difference Y1 becomes less than or equal to the first threshold Th1, and the current time Tx. By viewing the display in area 408, the user can visually grasp the elapsed time from the time T1 at which the adsorbent needs to be replaced to the current time Tx, as well as the time-series progression of the difference Y1.

[0106] Figure 9 shows an example of a replacement procedure display. When the user presses the replacement procedure button 403, the control unit 12 outputs the replacement procedure display to the display devices 13 and 15.

[0107] The replacement procedure display includes a window 411 showing the procedure for replacing the adsorbent, a back button 416, and a complete button 417. Window 411 includes areas 412 to 415 that show each replacement procedure. For example, area 412 displays the main message "Please replace the adsorbent."

[0108] Area 413 displays the text "Remove the first cassette from the dehumidifier" as the first step. The user removes the first cassette 312 from the dehumidifier 210 according to this display.

[0109] Area 414 displays the text "Remove the cassette from the suction part" as the second step. The user removes the cassette 322 from the suction part 220 according to this display.

[0110] Area 415 displays the text "Attach the cassette to the dehumidifier" as the third step. The user then attaches the cassette 322 to the mounting position for the first cassette 312 in the dehumidifier 210 according to the instructions.

[0111] Even if the CO2 adsorption capacity of the adsorbent contained in the adsorption section 220 deteriorates and decreases, the moisture absorption capacity of the adsorbent is often still usable. For this reason, as described above, the cassette 322 is shaped to be attachable to the mounting position of the first cassette 312, and in the replacement procedure display, the control unit 12 outputs a display to the display devices 13 and 15 indicating that the deteriorated adsorbent will be used as a dehumidifier. This allows the deteriorated adsorbent to be reused as a dehumidifier, and consumables (adsorbent, dehumidifier) ​​in the recovery device 11 can be used efficiently.

[0112] In addition to text, these areas 413-415 may also display illustrations, photographs, or other images that explain each procedure.

[0113] If the user wants to see the replacement indicator while the adsorbent has not yet been replaced, they press the back button 416. When the back button 416 is pressed, the display transitions from the replacement procedure display to the replacement indicator, without setting the replacement completion flag.

[0114] The user presses the complete button 417 when they have finished replacing the adsorbent. When the complete button 417 is pressed, the display transitions from the replacement procedure display to the normal display described later, and the replacement completion flag is set in the control unit 12. As a result, the control unit 12 performs actions such as resetting the usage time of the adsorbent.

[0115] Refer to Figure 7. If the control unit 12 determines "no deterioration" in step S22, the control unit 12 then determines whether the adsorbent is in a preliminary state with a lower degree of deterioration than the deteriorated state (the state in which it is determined that "deterioration is present") (preliminary state determination: step S24).

[0116] Specifically, when the difference Y1 between the inflow concentration C1 measured by the first concentration sensor 241 and the outflow concentration C2 measured by the second concentration sensor 242 is greater than the first threshold Th1 and less than or equal to a predetermined second threshold Th2 (Th2 > Th1) that is also greater than the first threshold Th1 (Th1 < Y1 ≤ Th2), the control unit 12 determines that the adsorbent contained in the first adsorption unit 221 is in a "preliminary state".

[0117] For example, even if the adsorbent is determined to be "deteriorated" at time T1, the user may not be able to immediately stop the vehicle V1 and replace the adsorbent. In particular, when the vehicle V1 is an agricultural vehicle, even if it is determined to be "deteriorated" during operation in the farmland, the operation in the farmland cannot be interrupted, and the operation of the vehicle V1 may continue with a low CO2 adsorption capacity of the adsorbent.

[0118] Therefore, the control unit 12 of the present embodiment determines the presence or absence of a "preliminary state" in which the CO2 adsorption capacity of the adsorbent has slightly decreased, although it is not necessary to replace it before the adsorbent is determined to be "deteriorated". When it is determined that there is a "preliminary state", the control unit 12 predicts the replacement time when the adsorbent will be determined to be "deteriorated" (step S25).

[0119] Specifically, when the control unit 12 determines that there is a "preliminary state", it predicts the replacement time. The method for predicting the replacement time is not particularly limited. For example, in the time-series graph of the difference Y1, a future prediction curve F1 may be drawn, and the future time T3 when the difference Y1 becomes less than or equal to the first threshold Th1 in the prediction curve F1 may be set as the replacement time.

[0120] Thereafter, before outputting the replacement display (FIG. 8), the control unit 12 outputs a preliminary display (FIG. 10) indicating the replacement time to the display devices 13 and 15 (step S26). Thereby, since the user can be notified in advance of the replacement time of the adsorbent, the user can appropriately maintain and inspect the recovery device 11, and more appropriate use of the recovery system 1 by the user can be promoted.

[0121] Figure 10 shows an example of a preliminary display. The preliminary display includes a message window 421 and a status display window 422. The message window 421 includes text such as "The time to replace the adsorbent is approaching."

[0122] The status display window 422 is a window that displays the current status of the adsorbent. Like the status display window 402 (Figure 8), the status display window 422 includes areas 404 to 407. Area 407 displays text indicating the replacement time of the adsorbent, for example, "It is predicted that the adsorbent will need to be replaced at time T3." Area 407 may also display the remaining time from the current time Tx to the predicted replacement time T3. By looking at the display in area 407, the user can find out when the adsorbent needs to be replaced.

[0123] The status display window 422 further includes an area 423 that displays a time-series graph of past values ​​of difference Y1 and a prediction curve F1 drawn based on the time-series graph. Area 423 displays, for example, a graph with difference Y1 on the vertical axis and time on the horizontal axis. This graph displays a first threshold Th1, a second threshold Th2, the time T2 when difference Y1 becomes less than or equal to the second threshold Th2, the current time Tx, and a future time T3 when difference Y1 is predicted to become less than or equal to the first threshold Th1. By looking at the display in area 423, the user can visually grasp the remaining time from the current time Tx to the predicted time T3 for adsorbent replacement, the time-series trend of difference Y1, and so on.

[0124] On the other hand, in step S24, the control unit 12 determines that there is "no pre-state" in the adsorbent material contained in the first adsorption unit 221 if, for example, the difference Y1 is greater than the second threshold Th2 (Y1 > Th2). In this case, the control unit 12 outputs a normal display to the display devices 13 and 15 (step S27).

[0125] The normal display shows, for example, the current status of the adsorbent. The normal display may be, for example, in the replacement display shown in Figure 8, a state in which no text such as "No abnormalities in the adsorbent" is displayed in the message window 401 and area 407 is not displayed in the status display window 402. This allows the user to know the status of the adsorbent.

[0126] With the above steps completed, the series of processes in the control unit 12 is finished. These processes are performed as needed or periodically while the vehicle V1 is running, and a predetermined display (such as a replacement display, a backup display, or a normal display) is output to the display devices 13 and 15 as appropriate, according to the detection result of the detection unit 240.

[0127] [Differentiation] The following describes modified examples of the embodiments. In the modified examples, components identical to those in the above embodiments are denoted by the same reference numerals and their descriptions are omitted.

[0128] [Variation of degradation detection 1: Evaluation using effluent concentration C2] In the above embodiment, the detection unit 240 includes a plurality of concentration sensors that measure the CO2 concentration both upstream and downstream of the adsorption unit 220, and the control unit 12 determines the deterioration state of the adsorbent based on the difference Y1 in CO2 concentration.

[0129] However, the detection unit 240 may not include a concentration sensor upstream of the adsorption unit 220, but only a concentration sensor downstream of the adsorption unit 220 (for example, sensors 242 and 244). When there is no abnormality in the adsorbent, the outflow concentration C2 is maintained at a relatively low value even while the engine 10 is running. In contrast, when the adsorbent deteriorates, CO2 leaks downstream without being adsorbed by the adsorbent, even while the engine 10 is running, and the outflow concentration C2 becomes relatively high.

[0130] Focusing on this trend, the control unit 12 may determine that the adsorbent contained in the adsorption unit 220 has deteriorated when the outflow concentration C2 exceeds a predetermined threshold Th3. In this case, the control unit 12 may set the predetermined threshold Th3 to the value obtained by adding a predetermined value M1 to the outflow concentration C2 immediately after the adsorbent of the adsorption unit 220 has been replaced (Th3 = initial value of outflow concentration C2 + M1).

[0131] Furthermore, the control unit 12 may calculate the difference Y2 between the discharge concentration C2 while the engine 10 is running (hereinafter referred to as "discharge concentration C21 during operation") and the discharge concentration C2 when the engine 10 is not running (hereinafter referred to as "discharge concentration C22 when not running") (Y2 = C21 - C22), and if this difference Y2 is greater than or equal to a predetermined threshold Th4 (Y2 ≥ Th4), it may determine that the adsorbent contained in the adsorption unit 220 has deteriorated.

[0132] With this configuration, there is no need to install a concentration sensor upstream of the adsorption unit 220, which allows for the detection of the deterioration state of the adsorbent while reducing the number of parts in the detection unit 240 compared to the above embodiment.

[0133] [Variation 2 of degradation detection: Evaluation using inflow concentration C1] The detection unit 240 may not include a concentration sensor downstream of the adsorption unit 220, but may include only a concentration sensor upstream of the adsorption unit 220 (for example, sensors 241 and 243). Although the adsorbent can be regenerated by releasing CO2 through heating, this regeneration capacity is not inexhaustible, and as CO2 adsorption and release are repeated, CO2 gradually becomes fixed to the adsorbent, and the CO2 adsorption capacity tends to decrease.

[0134] Focusing on this trend, the control unit 12 may integrate the inflow concentration C1 obtained from the detection unit 240, and if this integrated value is equal to or greater than a predetermined threshold Th5, it may determine that the adsorbent contained in the adsorption unit 220 has deteriorated.

[0135] However, the cumulative value alone may not accurately assess the degradation state of the adsorbent. Therefore, in order to more accurately assess the degradation state of the adsorbent, the degradation state may be determined based on the operating time of the recovery device 11 and the number of times the adsorption unit 220 repeats adsorption and release, in addition to the cumulative value.

[0136] For example, the detection unit 240 further includes a timer for measuring the operating time of the recovery device 11. The control unit 12 then determines the deterioration of the adsorbent contained in the adsorption unit 220 when the cumulative value of the inflow concentration C1 becomes equal to or greater than a threshold Th5 and the operating time becomes equal to or greater than a predetermined threshold Th6.

[0137] Furthermore, the detection unit 240 includes a counter that counts the number of times the switching valve 283 is switched, etc. The control unit 12 then calculates the number of times the adsorption unit 220 is adsorbed and released based on the number of switching times, etc., and determines that the adsorbent contained in the adsorption unit 220 has deteriorated when the cumulative value of the inflow concentration C1 is equal to or greater than the threshold Th5 and the number of repetitions is equal to or greater than a predetermined threshold Th7.

[0138] With this configuration, there is no need to install a concentration sensor downstream of the adsorption unit 220, which allows for the detection of the deterioration state of the adsorbent while reducing the number of concentration sensors in the detection unit 240 compared to the above embodiment.

[0139] [Variation of degradation detection 3: Evaluation using image data] In the above embodiments and modifications, the detection unit 240 includes a concentration sensor for measuring the CO2 concentration, and the control unit 12 determines the deterioration of the adsorbent based on the CO2 concentration.

[0140] However, the detection unit 240 may include cameras 245 and 246 that image at least one of the adsorbent material and the area around the adsorbent material, and the control unit 12 may determine the deterioration of the adsorbent material based on image data IM1 and IM2 captured by the cameras 245 and 246.

[0141] Figure 11 is a schematic diagram illustrating a modified detection unit 240 and image data IM1, IM2. The detection unit 240 includes a camera 245 that images the adsorbent material built into the cassette 322 of the adsorption unit 220, and a camera 246 that images the area around the adsorbent material of the adsorption unit 220.

[0142] For example, the cassette 322 has a configuration in which the adsorbent material is held in a container that is transparent to visible light, and the camera 245 images the adsorbent material from outside the cassette 322 through the transparent container. Alternatively, the camera 245 may be located inside the cassette 322 and directly image the adsorbent material.

[0143] Image data IM1 captured by camera 245 is transmitted to control unit 12. For example, if there is deterioration such as discoloration D1 or cracks D2 in the adsorbent, these deteriorations can be captured in image data IM1. The original color of the adsorbent is generally white, but discoloration D1 could be blackening of the adsorbent due to components such as soot contained in exhaust gas, yellowing due to the adsorbent's use over time, or whitening due to fading or burning of the originally colored adsorbent.

[0144] Therefore, the control unit 12 evaluates that there is an abnormality such as blackening or whitening of the adsorbent material if the brightness of the adsorbent material is more than a predetermined degree away from the reference brightness, and determines that the adsorbent material is "deteriorated". In addition, the control unit 12 evaluates that there is discoloration such as yellowing of the adsorbent material if the color difference between the color of the adsorbent material and the reference color is greater than a predetermined color difference, and determines that the adsorbent material is "deteriorated".

[0145] Furthermore, the control unit 12 performs known image processing on the image data IM1, for example, and determines that the adsorbent is "deteriorated" if the image data IM1 contains cracks D2. However, if the cracks D2 in the adsorbent are small, or if the number of cracks D2 is relatively small, the CO2 adsorption capacity of the adsorbent may be maintained to some extent, and replacement may not be necessary. Therefore, the control unit 12 may also determine that the adsorbent is "deteriorated" if the area of ​​the cracks D2 in the image data IM1 is greater than a predetermined size, or if there are more than a predetermined number of cracks D2.

[0146] Furthermore, camera 246 images, for example, the portion of container 321 located below cassette 322. This portion is where fragments D3 of the adsorbent material, which have collapsed due to vibrations of the vehicle V1, are expected to fall and accumulate.

[0147] The image data IM2 captured by camera 246 is transmitted to the control unit 12. The more fragments D3 there are, the more the adsorbent material is considered to have deteriorated. Therefore, the control unit 12 counts the number of fragments D3 contained in the image data IM2, and if the number of fragments D3 exceeds a predetermined number, it determines that the adsorbent material is "deteriorated".

[0148] Furthermore, even if the number of fragments D3 is small, if large fragments D3 are present, it is possible that the adsorbent material is severely deteriorated. In this case, the control unit 12 may count the number of pixels indicating fragments D3 in the image data IM2, and if this total number of pixels exceeds a predetermined number, it may determine that the adsorbent material is "deteriorated".

[0149] Figure 12 shows an example of the exchange display output by the control unit 12 to the display devices 13 and 15 in this modified example. The status display window 402 includes areas 431 and 432 that show the deterioration status of the adsorbent detected based on image data, an area 433 that displays these deterioration statuses in text, and an area 434 that shows image data (image data IM1 in the example of Figure 12).

[0150] For example, in region 434, instead of displaying the image data IM1 as is, the control unit 12 applies image processing to the image data IM1, and the areas evaluated as discoloration D1 or crack D2 are enclosed in a frame (for example, a red frame). This allows the user to understand that the framed regions R1 and R2 are the areas evaluated as discoloration D1 and crack D2, respectively, by the control unit 12, and to know the state of the adsorbent, as well as to understand any detection errors such as over-detection by the control unit 12.

[0151] Area 433 displays text indicating the deterioration status of the adsorbent, such as "The adsorbent has cracks" and "The adsorbent has discolored." By looking at the display in area 433, the user can learn about the deterioration status of the adsorbent.

[0152] Based on the above, the deterioration state of the adsorbent can be detected based on the image data IM1 and IM2 captured by cameras 245 and 246, and based on this, the control unit 12 can visually inform the user of the deterioration state of the adsorbent.

[0153] In the modified example described above, the detection unit 240 is provided with a separate camera 245 for imaging the adsorbent and a camera 246 for imaging the vicinity of the adsorbent. However, a camera that images both the adsorbent and the vicinity of the adsorbent may also be provided.

[0154] [Variation 4 of degradation detection: Evaluation by operating time] The adsorbent deteriorates with prolonged use of the recovery device 11. Therefore, the control unit 12 may determine the deterioration state of the adsorbent based on the operating time of the recovery device 11.

[0155] In this case, the detection unit 240 includes a timer for measuring the operating time of the recovery device 11. For example, the detection unit 240 may measure the operating time of the engine 10 as the operating time of the recovery device 11.

[0156] The detection unit 240 then transmits the operating time detected by the timer as a detection signal to the control unit 12. If the operating time exceeds a predetermined time, the control unit 12 determines that the adsorbent material is "deteriorated" and outputs a replacement indicator to the display devices 13 and 15. With this configuration, the detection unit 240 can be realized inexpensively using a relatively simple component configuration, namely a timer.

[0157] [Note] Furthermore, at least some of the embodiments and modifications described above may be combined in any way. Also, the embodiments and modifications disclosed herein should be considered in all respects as illustrative and not restrictive. The scope of this disclosure is defined by the claims, and all modifications within the meaning and scope of equivalence to the claims are intended. [Explanation of symbols]

[0158] 1. Collection System 10 Engines 11 Recovery device 12 Control Unit 13 Display device 14 Exhaust stack 15 Display device 201 1st heat exchanger 202 Second heat exchanger 203 Third heat exchanger 210 Dehumidification section 211 1st dehumidification section 212 2nd dehumidification section 220 Adsorption part 221 1st suction part 222 2nd suction part 231 Heat exchanger 232 Compressor 233 Recovery Department 240 Detection unit 241 First concentration sensor 242 Second concentration sensor 243 First concentration sensor 244 Second concentration sensor 245 Camera 246 Camera 251 pump 261 Hot water pipe 262 Cooling water pipe 271 Piping 272 Piping 273 Piping 274 Confluence path (piping) 275 Piping 276 Confluence path (piping) 277 Recovery route (piping) 281, 282, 283, 284, 285, 286, 287 Switching valve 311 Container 312 First Cassette 313 Second Cassette 314 Third Cassette 315 1st outlet 316 2nd outlet 321 Container 322 Cassettes 323 Outlet 401 Message Window 402 Status Display Window 403 Replacement Procedure Button 404,405,406,407,408 area V1 Vehicle U1 Driver (User) U2 Administrator (User) C1 inflow concentration C2 effluent concentration Y1 difference Th1 (First Threshold)

Claims

1. The vehicle body and The engine mounted on the aforementioned vehicle body, CO2, which is mounted on the vehicle body and emitted from the engine. ２ A recovery device that recovers by physically adsorbing and releasing adsorbents, A control unit that outputs a display to a display device indicating the deterioration of the adsorbent, Equipped with, Collection system.

2. A detection unit for detecting the deterioration of the adsorbent, Furthermore, The control unit outputs a display regarding the deterioration of the adsorbent in accordance with the detection result of the detection unit. The recovery system according to claim 1.

3. The detection unit detects when the adsorbent material is CO ２ This method detects degradation caused by repeated adsorption and release of substances. The recovery system according to claim 2.

4. The detection unit detects at least one of the CO2 inflow gas flowing into the adsorbent and the CO2 outflow gas flowing out from the adsorbent. ２ Includes a concentration sensor for measuring concentration, The recovery system according to claim 2.

5. The detection unit detects the CO of the incoming gas. ２ A first concentration sensor for measuring the concentration, and the CO of the effluent gas. ２ It includes a second concentration sensor for measuring concentration, The control unit measures CO2 measured by the first concentration sensor. ２ The concentration and the CO2 measured by the second concentration sensor ２ When the difference from the concentration is smaller than a predetermined first threshold, the display device outputs a message indicating that the adsorbent should be replaced. The recovery system according to claim 4.

6. The detection unit includes a camera that images at least one of the adsorbent material and the vicinity of the adsorbent material. The recovery system according to claim 2.

7. The control unit outputs a display message indicating that the adsorbent should be replaced when, in the image data captured by the camera of the adsorbent, at least one of the following conditions is met: the brightness of the adsorbent is more than a predetermined degree away from a reference brightness; the color difference between the color of the adsorbent and the reference color is greater than a predetermined color difference; and there is a crack in the adsorbent. The recovery system according to claim 6.

8. The control unit outputs a display message indicating that the adsorbent needs to be replaced to the display device when, in the image data captured by the camera of at least one of the adsorbent and the vicinity of the adsorbent, at least one of the following conditions is met: the number of fragments of the adsorbent exceeds a predetermined number, and the total number of pixels representing the fragments of the adsorbent exceeds a predetermined number. The recovery system according to claim 6.

9. The detection unit detects the operating time of the recovery device, The control unit outputs a display message to the display device indicating that the adsorbent should be replaced when the operating time detected by the detection unit exceeds a predetermined time. A recovery system according to any one of claims 2 to 8.

10. The recovery device further comprises a desiccant that adsorbs moisture in the exhaust gas. The dehumidifying material is provided upstream of the adsorbent in the exhaust gas flow path and contains the same material as the adsorbent. A recovery system according to any one of claims 2 to 8.

11. The control unit outputs a message to the display device indicating that the deteriorated adsorbent material should be used as the dehumidifier, in accordance with the detection result of the detection unit. The recovery system according to claim 10.

12. The control unit, When the detection unit detects a predetermined deterioration state of the adsorbent, it outputs a replacement indicator to the display device indicating that the adsorbent needs to be replaced. When the detection unit detects a preliminary state of the adsorbent in which the degree of deterioration is lower than the predetermined deterioration state, it predicts a replacement time in which the predetermined deterioration state can be detected, and outputs a preliminary display indicating the replacement time to the display device before outputting the replacement display. A recovery system according to any one of claims 2 to 8.

Images