Gas separation plant with lock arrangement for feeding a granular conveying medium into and / or discharging a granular conveying medium from a process chamber

Abstract

The present invention relates to a lock arrangement for feeding a granular conveying medium into and / or discharging a granular conveying medium from a process chamber of a gas separation plant, comprising a pipe section, a shut-off device configured to gas-tightly close or to open an opening in the pipe section, and a shielding device having a sleeve, the sleeve of the shielding device being configured to be arranged within the opening in order to seal the shut-off device, in the open state, from the granular conveying medium.

Description

[0001] R.415519

[0002] - 1 -

[0003] Description

[0004] title

[0005] Gas separation system with lock arrangement for the supply and / or discharge of a granular conveying medium into a process chamber

[0006] State of the art

[0007] The present invention relates to a sluice arrangement for the supply and / or discharge of a granular conveying medium into a process chamber of a gas separation plant and the associated gas separation plant.

[0008] In many process plants, a granular working fluid is conveyed. This granulate is often fed to and / or discharged from various process steps in batches using rotary valve technology. Depending on the process, different absolute pressures and gas compositions prevail in and between the respective process chambers. Due to the driving pressure differential between the process chambers, the rotary valve arrangements must meet corresponding tightness requirements to ensure that no or minimal gas exchange occurs between the process chambers, thus preventing any negative impact on the processes. Gas separation systems capable of adsorbing CO2 onto the surface of a granular medium can be used to recover carbon dioxide from the ambient air.For desorption of the adsorbed CO2, the granular medium can be introduced into a process chamber where CO2 can be desorbed under defined temperature and vacuum conditions. The granular medium can have a high hardness, which can lead to abrasion or electrostatic charging during transport. Furthermore, fine abrasion particles can form, which may adhere to surfaces if the surface is moist. These properties can have negative effects (R.415519).

[0009] - 2 -

[0010] This has an impact on the tightness and service life of lock systems.

[0011] Disclosure of the invention

[0012] The airlock arrangement according to the invention, comprising the features of claim 1, the desorption device according to the invention, comprising the features of claim 11, and the gas separation system, comprising the features of claim 15, have the advantage that a shut-off device of the airlock arrangement can be protected from a granular conveying medium, thus enabling a high degree of tightness and a long service life of the airlock arrangement for a gas separation system. According to the invention, this is achieved by the airlock arrangement comprising a pipe section, a shut-off device, and a shading device with a sleeve. The shut-off device is configured to selectively close or open an opening in the pipe section in a gas-tight manner.Furthermore, the sleeve of the shading device is designed to be positioned within the opening to seal the shut-off device against the granular conveying medium when open. This allows the granular conveying medium to be introduced batchwise into the process chamber via the pipeline section. The process chamber can then be sealed gas-tight using the shut-off device, enabling, for example, the desorbing of carbon dioxide (CO2) from the granular conveying medium. When the shut-off device is open, the shading device protects it from the negative effects of the granular conveying medium on its tightness and service life. The granular conveying medium preferably flows through an inner section of the sleeve, with an outer section of the sleeve located at the shut-off device.

[0013] The opening refers in particular to an opening section of the pipeline section.

[0014] The dependent claims describe preferred embodiments of the invention. R.415519

[0015] - 3 -

[0016] Preferably, the shut-off device comprises or is a gate valve.

[0017] Slide valves can be easily and cost-effectively installed on the pipeline section to selectively open or close an opening in the pipeline section in a gas-tight manner. Slide valves have minimal impact on the opening cross-section of the pipeline section, allowing the slide valve to be easily sealed against the granular conveyed medium in the open position using the sleeve of the shading device.

[0018] A cylindrical opening is also preferred. Cylindrical openings can be sealed easily and cost-effectively using a hollow cylindrical sleeve.

[0019] The sleeve is preferably movable between a first position outside the opening and a second position inside the opening. The sleeve is preferably located in the first position when the shut-off device is open and in the second position when the shut-off device is closed. This allows for flexible and rapid control of the shut-off device, whereby the shading device can be moved from a first position to a second position depending on the opening state.

[0020] Furthermore, the shading device preferably includes a return spring configured to exert a restoring force on the sleeve. This restoring force can act on the sleeve in the direction of either the first or the second position. This means that an actuator only needs to apply a force opposite to the restoring force to the sleeve in order to move it between the first and second positions. The restoring force is preferably directed towards the first position if the sleeve is typically in the first position during operation.

[0021] Alternatively, the restoring force is preferably directed towards the second position if the sleeve is in the second position for most of the operating time.

[0022] Preferably, the sleeve has a hinged valve which is configured to open the hinged valve depending on a defined weight force of the granular conveying medium. Thus, the R.415519

[0023] - 4 -

[0024] The shut-off device is controlled independently by the quantity or weight of the granular conveying medium in contact with it, in order to seal the shut-off device against the granular conveying medium when open. Preferably, the dependence of the flap valve on the weight force can be adjusted by modifying the pressure in the process chamber. For example, by reducing the pressure in the process chamber located downstream of the shut-off device, the flap valve can open even with a reduced weight force. The restoring force preferably acts in the direction of the first position, with the first position being located above the second position, so that the sleeve is drawn into the opening of the shut-off device by the weight force and can seal it even before the flap valve opens.After the granular conveying medium has escaped through the flap valve, the flap valve can close automatically and the sleeve can move towards the first position due to the slight weight force, after which the shut-off device can be closed.

[0025] The sleeve is preferably designed as a telescopic sleeve, wherein the telescopic sleeve is configured to change its usable length. The telescopic sleeve preferably comprises two or more sleeve elements that can be moved relative to each other to change the usable length of the telescopic sleeve. Thus, by extending the telescopic sleeve, the sleeve can be positioned in the opening of the shut-off device to seal it against the conveyed granular medium. Alternatively, more than two sleeve elements of the telescopic sleeve can be nested within each other to bridge greater distances.

[0026] Preferably, the shading device includes a coil configured to exert a magnetic force on the sleeve in order to displace it. This allows the actuator of the shading device to be located outside the shut-off device, thus preventing leakage to the outside. The coil can generate a magnetic field that exerts a magnetic force on the sleeve.

[0027] Preferably, the shading device has a magnetic core and the sleeve an armature element, such that the coil is configured to exert a reluctance force on the sleeve in order to displace it. R.415519

[0028] -5 -

[0029] When the coil is energized, the sleeve with the armature is pulled towards the magnetic core, thereby reducing the magnetic resistance in the magnetic circuit. This allows for simple and reliable movement of the sleeve.

[0030] The magnetic core and the armature element preferably each have stepped sections aligned with each other, designed to engage with one another. These stepped sections allow for larger strokes of the sleeve, which can result in a larger sealing area of ​​the sleeve.

[0031] The shading device preferably incorporates a pneumatic actuator to move the sleeve. Pneumatic actuators allow for the simple and reliable transmission of high forces to the sleeve and enable large strokes of the sleeve.

[0032] Preferably, the pneumatic actuator has two bellows elements. The bellows elements can act in opposite directions, allowing the pneumatic actuator to be controlled in a double-acting manner. Alternatively or additionally, a return spring can be arranged in one of the bellows elements, which can support the restoring effect of the bellows element.

[0033] Furthermore, the invention relates to a desorption device, in particular for obtaining CO2 from the ambient air, comprising a process chamber for receiving an adsorbent in order to desorb a gas adsorbed on an adsorbent, and a lock arrangement according to the type described above for supplying and / or removing the adsorbent into the process chamber.

[0034] Furthermore, the invention relates to a gas separation system, in particular for the extraction of CO2 from ambient air. The gas separation system comprises an adsorbent designed as a granular conveying medium and configured to adsorb a gas. The gas separation system also includes a process chamber for desorbing a gas adsorbed on the adsorbent. To enable the adsorbent to be fed into and / or discharged from the process chamber, the gas separation system features a previously described airlock arrangement. Thus, by means of R.415519

[0035] - 6 -

[0036] The lock arrangement enables reliable gas extraction from the adsorbent, while the negative effects on tightness over the lifetime of the shut-off device can be reduced by the shading device.

[0037] Brief description of the drawings

[0038] Exemplary embodiments of the invention are described in detail below with reference to the accompanying drawings. The drawing shows:

[0039] Figure 1 shows a schematic representation of a gas separation plant with a lock arrangement,

[0040] Figure 2a shows a schematic representation of a lock arrangement according to a first embodiment in the closed state,

[0041] Figure 2b shows a schematic representation of the lock arrangement according to the first embodiment in the opening state,

[0042] Figure 2c shows a schematic representation of the lock arrangement according to the first embodiment in the open state,

[0043] Figure 3a shows a schematic representation of a lock arrangement according to a second embodiment of the invention in the open state,

[0044] Figure 3b shows a schematic representation of the lock arrangement according to the second embodiment in the closed state,

[0045] Figure 4a shows a schematic representation of a lock arrangement according to a third embodiment in the open state, R.415519

[0046] - 7 -

[0047] Figure 4b shows a schematic representation of the lock arrangement according to the third embodiment in the closed state,

[0048] Figure 5a shows a schematic representation of a lock arrangement according to a fourth embodiment in the opening state,

[0049] Figure 5b shows a schematic representation of the lock arrangement according to the fourth embodiment in the open state,

[0050] Figure 6a shows a schematic representation of a lock arrangement according to a fifth embodiment of the invention in the open state,

[0051] Figure 6b shows a schematic representation of the lock arrangement according to the fifth embodiment of the invention in the closing state,

[0052] Figure 6c shows a schematic representation of the lock arrangement according to the fifth embodiment in the closed state,

[0053] Figure 7a shows a schematic representation of a lock arrangement according to a sixth embodiment in the closed state,

[0054] Figure 7b shows a schematic representation of the lock arrangement according to the sixth embodiment of the invention in the open state,

[0055] Figure 8a shows a schematic representation of a lock arrangement according to a seventh embodiment of the invention in the closed state, R.415519

[0056] - 8 -

[0057] Figure 8b shows a schematic representation of the lock arrangement according to the seventh embodiment of the invention in the opening state and

[0058] Figure 8c shows a schematic representation of the lock arrangement according to the seventh embodiment of the invention in the open state.

[0059] Embodiments of the invention

[0060] Preferably, all identical components, elements and / or units in all figures are provided with the same reference numerals.

[0061] The following describes in detail a lock arrangement 1 and a gas separation system 100 with reference to Figures 1 to 8c.

[0062] Figure 1 shows the gas separation system 100, which can be used in particular for the recovery of CO2 from ambient air. The gas separation system 100 comprises an adsorbent, which is designed as a granular conveying medium 2 and is arranged in a process chamber 3. The adsorbent can adsorb gas from the ambient air in an adsorption device. Once the adsorbent has adsorbed sufficient gas from the ambient air, it can be introduced into the process chamber 3 through the airlock 1. Defined temperature and vacuum conditions prevail in the process chamber 3 to desorb the adsorbed gas from the adsorbent. The desorbed gas can then be discharged from the process chamber 3. Furthermore, after desorbing, the granular conveying medium 2 can be discharged from the process chamber 3 through the airlock 1 to adsorb gas from the ambient air again.

[0063] The granular conveying medium 2 preferably has a mean diameter of approximately 0.6 mm. Further properties of the granular conveying medium 2 include high hardness and abrasion behavior, which can result in fine abrasion particles, as well as electrostatic charging upon contact with other bodies. Surface moisture content in R.415519

[0064] - 9 -

[0065] Gas separation systems can lead to an adhesion tendency of the granular conveyed medium 2. These properties can have negative effects on the tightness over the service life of the airlock assembly 1, as well as on the smooth operation due to wear mechanisms and jamming effects.

[0066] Figure 2a shows the airlock arrangement 1 for the gas separation system 100 according to a first embodiment of the invention. The airlock arrangement 1 serves to supply and / or discharge the granular conveying medium 2 into the process chamber 3. For this purpose, the airlock arrangement 1 has a pipe section 10. Within the pipe section 10, the granular conveying medium 2 can be transported within the gas separation system 100 to the process chamber 3. The pipe section 10 is preferably hollow cylindrical.

[0067] Furthermore, the lock assembly 1 includes a shut-off device 20, which is configured to close or open an opening 21 in the pipeline section 10 in a gas-tight manner. This allows the process chamber 3 to be gas-tightly separated from the rest of the gas separation system 100, so that gas adsorbed on the granular conveying medium 2 can be desorbed in the process chamber 3 under defined temperature and vacuum conditions. The shut-off device 20 is designed as a slide valve. The slide valve comprises a slide that is arranged perpendicular to a longitudinal axis XX of the pipeline section 10 and can close the opening 21 in the pipeline section in a gas-tight manner.

[0068] The opening 21 is closed off circumferentially by a sealing area 22, in which the slide of the gate valve can rest against the pipe section 10 to close the opening 21. The sealing area 22 can also serve as a guide for the slide of the gate valve. For improved sealing of the lock assembly 1, sealing elements, such as an elastomer seal, can be arranged in the sealing area 22.

[0069] A shading device 30, which has a sleeve 31, is arranged on the shut-off device 20. The sleeve 31 of the shading device 30 is movable and can be positioned within the opening 21 to seal the shut-off device 20 in the open state against the granular conveying medium 2. R.415519

[0070] - 10 -

[0071] The sleeve 31 is hollow and cylindrical, and its outer surface rests against the inner surface of the pipe section 10. The sleeve 31 has a through-opening which is arranged coaxially with the pipe section 10, so that the granular conveying medium 2 can be guided through the sleeve 31. To avoid creating a bottleneck, the cross-sectional area of ​​the opening of the sleeve 31 is preferably similar in size to the cross-sectional area of ​​the pipe section 10.

[0072] Figure 2b shows the lock assembly 1 according to the first embodiment in Figure 2a after the shut-off device 20 has been opened. For this purpose, the slide of the slide valve was pushed to the side, so that the opening 21 is released. This allows the sleeve 31 to move downwards to seal the shut-off device 20 against the granular conveying medium 2. Otherwise, abrasive particles from the granular conveying medium 2 could accumulate in the sealing area 22, which could negatively affect the function of the shut-off device 20. Furthermore, the hardness of the granular conveying medium 2 could damage the sealing area 22.

[0073] Figure 2c shows the airlock arrangement according to the first embodiment in the open state. The sleeve 31 completely overlaps the sealing area 22 of the shut-off device 20. Thus, the granular conveying medium 2 can be guided through the airlock arrangement 1 without any risk of the granular conveying medium 2 negatively affecting its function. After the granular conveying medium 2 has been conveyed through the airlock arrangement, the sleeve 31 of the shading device 30 can be moved upwards and the shut-off device 20 can be closed gas-tight, for example, to desorb the gas adsorbed on the granular conveying medium 2 in the process chamber 3.

[0074] Figure 3a shows the airlock assembly 1 according to a second embodiment of the invention in the open state. The second embodiment of the airlock assembly 1 has a coil 35 which can be energized to generate a magnetic field. Furthermore, the shading device 30 of the airlock assembly 1 has a magnetic core 36 which can conduct the magnetic field. The magnetic core 36 is preferably made of a soft magnetic material. (Furthermore, R.415519)

[0075] - 11 -

[0076] An armature element 37 is arranged on the sleeve. The magnetic field of the coil 35 can generate a reluctance force F2, which pulls the sleeve 31 towards the magnetic core 36.

[0077] Furthermore, according to the second embodiment, the lock assembly 1 has a return spring 32 which exerts a return force F1 on the sleeve. The return force F1 is opposite to the reluctance force F2. Thus, when the coil 35 is de-energized, only the return force F1 acts on the sleeve 31. When the coil 35 is energized, both the return force F1 and the reluctance force F2 act on the sleeve 31. The reluctance force F2 is preferably greater than the return force F1, so that the sleeve is pulled towards the magnetic core 36 or held against it.

[0078] In the second embodiment, the sleeve 31 is movable between a first position outside the opening 21 and a second position inside the opening 21. The restoring force F1 of the return spring 32 pushes the sleeve 31 of the shading device 30 into a second position inside the opening 21 to seal the shut-off device 20 against the granular conveying medium. The reluctance force F2 can move the sleeve 31 towards the first position outside the opening 21, so that the opening 21 can be closed gas-tight by the shut-off device 20. This arrangement is preferred when the sleeve 31 is in the second position for most of the operating time.

[0079] The pipe section 10 is in two parts and has a smaller opening cross-section in the area above the opening 21 than in the area below the opening 21. This ensures that the granular conveyed medium 2 does not accumulate below the opening 21.

[0080] Figure 3b shows the lock assembly 1 according to the second embodiment in the closed state. In the closed state, the coil 35 is energized and generates a magnetic field that exerts the reluctance force F2 on the armature element 37 of the sleeve 31 and fixes the sleeve 31 in the first position. Furthermore, the shut-off device 20 is closed, so that the slide of the slide valve is positioned in the sealing area 22 and the opening 21 closes gas-tight. In the closed state, R.415519

[0081] - 12 -

[0082] The sleeve 31 can also be supported on the shut-off device 20, so that the coil 35 does not need to be permanently energized to generate a reluctance force F2.

[0083] Figure 4a shows the lock assembly 1 according to a third embodiment of the invention in the open state. The third embodiment is similar to the second embodiment and differs essentially in the shape of the magnetic core 36 and the armature element 37. The magnetic core 36 and the armature element 37 have a stepped section 38. The stepped sections 38 can engage with each other and make it possible to increase the stroke of the sleeve 31 as well as the reluctance force F2 on the sleeve 31.

[0084] Figure 4b shows the lock assembly 1 according to the third embodiment in the closed state. In the closed state, the step section 38 of the armature element 37 engages in the step section 38 of the magnetic core 36, so that the two step sections 38 lie flush against each other.

[0085] Figure 5a shows the lock arrangement 1 according to a fourth embodiment of the invention in the opening state. The fourth embodiment is similar to the second embodiment of the invention and differs essentially in that the restoring force F1 acts in the direction of the first position outside the opening 21 and the reluctance force F2 acts in the direction of the second position inside the opening 21.

[0086] The magnetic core 36 is arranged on the side of the shut-off device 20 opposite the shading device 30. This arrangement is preferred if the sleeve 31 is in the first position outside the opening 21 for most of the time during operation of the lock arrangement 1.

[0087] Figure 5b shows the lock assembly 1 according to the fourth embodiment of the invention in the open state. In the open state, the sleeve 31 of the shading device 30 is arranged in the second position within the opening 21. For this purpose, the coil 35 is energized so that it generates a magnetic field which exerts the reluctance force F2 on the sleeve 31.

[0088] - 13 -

[0089] and fixes these in the second position within the opening 21, so that the shut-off device 20 seals the opening 21 against the granular conveying medium 2.

[0090] Figure 6a shows the lock assembly 1 according to a fifth embodiment of the invention in the open state. The fifth embodiment is similar to the second embodiment of the invention and differs essentially in that the sleeve 31 is designed as a telescopic sleeve 34.

[0091] The telescopic sleeve 34 comprises a first sleeve element 31a and a second sleeve element 31b. The first sleeve element 31a rests against an outer surface of the second sleeve element 31b, allowing it to slide along the longitudinal axis XX relative to the second sleeve element 31b. Furthermore, both the first sleeve element 31a and the second sleeve element 31b have a shoulder, ensuring that the first sleeve element 31a remains in contact with the second sleeve element 31b when the telescopic sleeve 34 is extended. The return spring 32 is located on the first sleeve element 31a and exerts a return force F1 on it, which, in particular, positions the first sleeve element 31a within the opening 21.

[0092] Figure 6b shows the lock assembly 1 according to the fifth embodiment in the closing state. For this purpose, the coil 35 is energized so that it generates a magnetic field. The magnetic field is directed by the magnetic core 36 and exerts a reluctance force F2 on the armature element 37 in the first sleeve element 31a and the armature element 37 in the second sleeve element 31b, so that these are drawn towards the magnetic core 36 into the first position outside the opening 21.

[0093] Figure 6c shows the lock assembly 1 according to the fifth embodiment of the invention in the closed state. In the closed state, the first sleeve element 31a has moved towards the second sleeve element 31b, so that the anchor elements 37 of the two sleeve elements 31a, 31b are arranged at the same height on the magnetic core 36. In this position, the telescopic sleeve 34 is arranged outside the opening 21, so that the shut-off device 20 can be closed.

[0094] - 14 -

[0095] In the closed state, the telescopic sleeve 31 has a second length L2 along the longitudinal axis XX, which is shorter than a first length L1 of the telescopic sleeve 34 in the open state of the lock assembly 1. The telescopic sleeve in the state of the first length L1 is shown in Figures 6a and 6b.

[0096] Figure 7a shows the lock assembly 1 according to a sixth embodiment of the invention in the closed state. The lock assembly 1 in the sixth embodiment differs from the other embodiments in particular in that the shading device 30 has a pneumatic actuator 40 to displace the sleeve 31.

[0097] The pneumatic actuator 40 opens two bellows elements 41, which are sealed to the interior of the sluice assembly 1. A pressure change within the bellows elements 41 allows the sleeve 31 to move into or out of the opening 21, thus sealing the shut-off device 20 against the granular conveying medium 2 when open. The lower bellows element 41 can perform a spring-loaded actuating function and may be additionally supported, for example, by a return spring 32.

[0098] The pneumatic actuator 40 can also be double-acting. In this case, a 3 / 2 pneumatic control valve 42 can actively control the first bellows element 41 or the second bellows element 41 to move the sleeve 31 upwards or downwards.

[0099] Figure 7b shows the lock assembly 1 according to the sixth embodiment of the invention in the open state. The shut-off device 20 was opened to open the opening 21. Subsequently, the upper bellows element 41 was pressurized to move the sleeve 31 towards the second position within the opening 21 and to seal the shut-off device 20 against the granular conveying medium 2, which could then pass through the lock assembly 1.

[0100] Figure 8a shows the lock assembly 1 according to a seventh embodiment of the invention in the closed state. The seventh embodiment differs from the other embodiments in that it does not have an active actuator that exerts a force on the sleeve 31R.415519

[0101] - 15 -

[0102] The sleeve 31 has a hinged valve 33, which is configured to open the hinged valve 33 depending on a defined weight force of the granular conveying medium 2. For this purpose, the hinged valve 33 has a spring that opens the hinged valve 33 when a defined weight force of the granular conveying medium 2 is applied. The weight force depends on the quantity of the granular conveying medium 2 located above the hinged valve 33. The weight force can be adjusted by setting a pressure differential between the two sides of the hinged valve 33.

[0103] Furthermore, the lock assembly 1 has the return spring 32, which exerts the return force F1 on the sleeve 31 in order to move it into a first position outside the opening 21.

[0104] Figure 8b shows the lock arrangement 1 according to the seventh embodiment of the invention in the opening state.

[0105] In the opening position, the shut-off device 20 was opened to release the opening 21. Due to the weight of the granular conveying medium 2 pressing on the shading device 30, the sleeve 31 is moved towards the second position within the opening 21. This allows the sleeve 31 to seal the shut-off device 20 against the granular conveying medium 2.

[0106] Furthermore, the increasing weight of the granular conveying medium 2 opens the flap valve 33, allowing the granular conveying medium to flow through the sluice arrangement 1 towards a process chamber 3.

[0107] Figure 8c shows the lock assembly 1 according to the seventh embodiment of the invention in the open state. Here, the flap valve 33 has opened further due to increasingly larger quantities of granular conveying medium 2 above the shut-off device 20, in order to increase the flow rate of granular conveying medium 2.

[0108] If no granular conveying medium 2 arrives, the granular conveying medium 2 flows through the flap valve 33 until the R.415519

[0109] - 16 -

[0110] The weight of the granular conveying medium 2 is no longer sufficient to keep the flap valve 33 open, and it closes. At this point, the restoring force F1 of the return spring 32 is preferably so large compared to the weight of the conveying medium 2 that the sleeves 31 of the shading device 30 move towards the first position outside the opening 21, and the shut-off device 20 can close the opening 21 gas-tight, so that the granular conveying medium 2 can desorb any adsorbed gas in the process chamber 3 of the gas separation system 100.

Claims

R.415519 - 17 - Claims 1. Lock arrangement (1) for the supply and / or discharge of a granular conveying medium (2) into a process chamber (3) of a gas separation plant (100), comprising - a section of pipeline (10), - a shut-off device (20) which is configured to selectively close or open an opening (21) in the pipeline section (10) in a gas-tight manner, and - a shading device (30) with a sleeve (31), - wherein the sleeve (31) of the shading device (30) is arranged to be positioned within the opening (21) in order to seal the shut-off device (20) in the open state against the granular conveying medium (2).

2. Lock arrangement (1) according to claim 1, wherein the shut-off device (20) comprises or is a gate valve (20).

3. Lock arrangement (1) according to one of the preceding claims, wherein the opening (21) is cylindrical.

4. Lock arrangement (1) according to one of the preceding claims, wherein the sleeve (31) is movable between a first position outside the opening (21) and a second position inside the opening (21).

5. Lock arrangement (1) according to claim 4, wherein the shading device (30) has a return spring (32) which is configured to exert a return force (F1) on the sleeve (31).

6. Lock arrangement (1) according to claim 5, wherein the sleeve (31) has a hinged valve (33) which is configured to open the hinged valve (33) depending on a defined weight force of the granular conveying medium (2). R.415519 - 18 - 7. Lock arrangement (1) according to one of the preceding claims, wherein the sleeve (31) is designed as a telescopic sleeve (34), wherein the telescopic sleeve (34) is configured to change a usable length of the telescopic sleeve (31).

8. Lock arrangement (1) according to one of the preceding claims, wherein the shading device (30) has a coil (35) which is configured to exert a magnetic force on the sleeve (31) in order to displace the sleeve (31).

9. Lock arrangement (1) according to claim 8, wherein the shading device (30) has a magnetic core (36) and wherein the sleeve (31) has an armature element (37) such that the coil (35) is configured to exert a reluctance force (F2) on the sleeve (31) in order to displace it.

10. Lock arrangement (1) according to claim 9, wherein the magnetic core (36) and the armature element (37) each have step areas (38) aligned with each other which are arranged to engage with each other.

11. Lock arrangement (1) according to one of claims 1 to 7, wherein the shading device (30) has a pneumatic actuator (40) to move the sleeve (31).

12. Lock arrangement (1 ) according to claim 11 , wherein the pneumatic actuator (40) comprises two bellows elements (41).

13. Desorption device, in particular for extracting CO2 from ambient air, comprising a process chamber (3) for receiving an adsorbent in order to desorb a gas adsorbed on an adsorbent, and A lock arrangement (1) according to one of the preceding claims for supplying and / or discharging the adsorbent into the process chamber (3). R.415519 - 19 - 14. Desorption device according to claim 13, comprising the adsorbent, which is designed as a granular conveying medium (2) and is configured to adsorb a gas, in particular CO2, 15. Gas separation system (100), in particular for the recovery of CO2 from the ambient air, comprising a desorption device according to claim 13 or 14.

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