Rotary low-temperature adsorption regeneration equipment with flue gas cooling function

Abstract

This invention belongs to the field of flue gas adsorption technology and discloses a rotary low-temperature adsorption and regeneration device with flue gas cooling function. It includes an outer shell, an inner shell, a flue gas cooling module, and an adsorbent bed. The inner shell is located inside the outer shell and is radially spaced from it. The space between the outer and inner shells is divided into at least an adsorption zone and a regeneration zone circumferentially. The flue gas cooling module is located in the flue gas cooling chamber and is used to cool the flue gas entering from the inlet to a sub-zero temperature. The outlet is used to discharge the low-temperature flue gas into the adsorption zone. The adsorbent bed is located between the outer and inner shells and is rotatable circumferentially to sequentially enter the adsorption zone and the regeneration zone. The rotary flue gas adsorption and regeneration device provided by this invention integrates flue gas cooling, flue gas adsorption, and adsorbent regeneration, reducing the number of system devices for low-temperature flue gas adsorption and adsorbent regeneration, as well as the overall system footprint.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, and in particular to a rotary low-temperature adsorption and regeneration device with flue gas cooling function. Background Technology

[0002] In related technologies, the purification of coal-fired flue gas using adsorbents generally employs high-temperature adsorption. This involves passing flue gas, typically at 200°C, into an adsorption tower filled with adsorbent, where pollutants are adsorbed and removed. The adsorbent, now ready for regeneration, is then transported to a regeneration tower for heating and desorption to regenerate it. The regenerated adsorbent is returned to the adsorption tower to continue purifying the flue gas, thus achieving a cycle of adsorbent utilization between the adsorption and regeneration towers. However, high-temperature adsorption suffers from poor adsorption efficiency and a high nitrogen oxide content in the purified flue gas. Summary of the Invention

[0003] This invention is based on the inventor's discoveries and understanding of the following facts and problems:

[0004] To overcome the problems associated with high-temperature adsorption, a low-temperature adsorption technology for flue gas has been proposed. This involves first cooling the high-temperature flue gas in a spray cooling tower to a temperature below room temperature, then introducing the cooled flue gas into an adsorption tower for low-temperature adsorption. The saturated adsorbent is then sent to a regeneration tower for heated desorption and regeneration. The regenerated adsorbent is then returned to the adsorption tower for recycling. In low-temperature adsorption, the adsorption capacity of the adsorbent is increased exponentially in a low-temperature environment, significantly improving the adsorption and purification rate compared to conventional high-temperature flue gas adsorption, and enabling near-zero emissions of flue gas.

[0005] However, the low-temperature adsorption and regeneration equipment for flue gas in related technologies includes at least three tower structures: a spray cooling tower, an adsorption tower, and a regeneration tower. This results in a large number of devices, a large footprint, complex piping connections, and high construction costs. Related technologies have also proposed rotary adsorption towers that integrate the adsorption and regeneration zones. While this eliminates the need for transferring the adsorbent between the adsorption and regeneration towers, the inventors discovered that during the process of transporting the low-temperature flue gas from the spray cooling tower to the adsorption zone of the adsorption tower, the ambient temperature affects the flue gas temperature in the transport pipeline, causing a loss of cooling capacity. This reduces the removal efficiency of pollutants in the adsorption zone, necessitating the installation of insulation layers in the transport pipeline, further increasing costs. Therefore, improvements are needed.

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a rotary flue gas adsorption and regeneration device with flue gas cooling function.

[0007] The present invention discloses a rotary low-temperature adsorption and regeneration device with flue gas cooling function, comprising: an outer shell and an inner shell, the inner shell being located inside the outer shell, the axial direction of the inner shell being parallel to the axial direction of the outer shell, the inner shell and the outer shell being spaced apart from each other radially, the space between the outer shell and the inner shell being divided into at least an adsorption zone and a regeneration zone in the circumferential direction of the outer shell, the inner cavity of the inner shell forming a flue gas cooling chamber, the flue gas cooling chamber having an inlet and an outlet, the outlet communicating with the adsorption zone; a flue gas cooling module, the flue gas cooling module being located in the flue gas cooling chamber, used to cool the flue gas entering from the inlet into low-temperature flue gas with a temperature below room temperature, the outlet being used to discharge the low-temperature flue gas into the adsorption zone; and an adsorbent bed, the adsorbent bed being disposed between the outer shell and the inner shell and rotatable in the circumferential direction of the outer shell so as to sequentially enter the adsorption zone and the regeneration zone, the adsorbent bed contacting the low-temperature flue gas in the adsorption zone to adsorb and purify the low-temperature flue gas, and the adsorbent bed being heated and regenerated in the regeneration zone.

[0008] The rotary low-temperature adsorption and regeneration device with flue gas cooling function provided by this invention integrates the flue gas cooling module, the flue gas adsorption zone, and the adsorbent regeneration zone into a single tower. This allows for the cooling of flue gas, the adsorption of low-temperature flue gas, and the regeneration of the adsorbent within a single integrated housing. Compared with related technologies, this eliminates the need for separate spray cooling towers, adsorption towers, and regeneration towers, reducing the number of devices required for low-temperature flue gas adsorption and regeneration, as well as the overall system footprint. It features high integration, for example, saving at least 30% of the floor space.

[0009] The highly integrated adsorption-regeneration equipment eliminates the need for transporting adsorbent between the adsorption and regeneration towers. The adsorbent circulates between the adsorption and regeneration zones, reducing transport time and costs. Simultaneously, it eliminates the need for pipelines transporting flue gas from the spray cooling tower to the adsorption tower. The low-temperature flue gas, cooled by the flue gas cooling module, is directly sent into the adsorption zone for adsorption, shortening the transport distance, saving transport time, improving adsorption-regeneration efficiency, eliminating the construction costs of flue gas transport pipelines, avoiding heat loss during transport, and enhancing the low-temperature adsorption effect, ultimately achieving near-zero emissions.

[0010] Optionally, the rotary low-temperature adsorption regeneration device with flue gas cooling function further includes a first heat insulation plate and a second heat insulation plate. The first heat insulation plate and the second heat insulation plate are located in the gap between the outer shell and the inner shell. The first heat insulation plate and the second heat insulation plate extend along the axial direction of the outer shell and are spaced apart in the circumferential direction of the outer shell. The adsorbent bed is disposed between the first heat insulation plate and the second heat insulation plate. The first heat insulation plate and the second heat insulation plate are movably disposed along the circumferential direction of the outer shell to drive the adsorbent bed to move along the circumferential direction of the outer shell.

[0011] Optionally, the inner shell includes a fixed shell and a rotating shell. The rotating shell is fitted over the fixed shell and can rotate around the fixed shell. The first heat insulation plate and the second heat insulation plate are connected to the rotating shell and move circumferentially along the outer shell under the drive of the rotating shell. The flue gas cooling module is located inside the fixed shell. The fixed shell is provided with a first outlet, and the rotating shell is provided with a second outlet opposite to the adsorbent bed. When the adsorbent bed rotates with the rotating shell to reach the adsorption zone, the first outlet and the second outlet are opposite to each other to form the flue gas outlet. When the adsorbent bed rotates with the rotating shell to leave the adsorption zone, the first outlet is blocked by the rotating shell.

[0012] Optionally, the outer shell is cylindrical, the inner shell is tubular, and the outer shell and the inner shell are coaxially arranged.

[0013] Optionally, the space between the outer shell and the inner shell further includes a cooling zone and a preheating zone. The cooling zone, adsorption zone, preheating zone, and regeneration zone are arranged sequentially in the circumferential direction of the outer shell. The adsorbent bed is rotatable along the circumferential direction of the outer shell to sequentially enter the cooling zone, adsorption zone, preheating zone, and regeneration zone. The adsorbent bed is cooled in the cooling zone and preheated in the preheating zone. Adsorption, regeneration, and cooling are integrated, and adsorption, regeneration, and cooling of the adsorbent are completed within a single integrated shell. This reduces the number of devices required for flue gas adsorption and regeneration, as well as the floor space occupied by the equipment. The adsorbent is regenerated using a multi-stage heating method, i.e., the adsorbent is first preheated in the preheating zone, and then the preheated adsorbent is heated in the regeneration zone. This reduces the temperature rise range of the adsorbent in the regeneration zone, which helps to reduce the energy consumption and operating costs of the adsorption and regeneration equipment. The purpose of the cooling zone is to cool down the regenerated high-temperature adsorbent and reduce the temperature of the adsorbent in the adsorption zone that comes into contact with the low-temperature flue gas. Low-temperature adsorbents have strong adsorption efficiency, so the setting of a cooling zone helps to improve the adsorption efficiency of the adsorption tower.

[0014] Optionally, there are multiple adsorbent beds, and heat insulation plates are provided between the multiple adsorbent beds. When one of the multiple adsorbent beds is located in one of the cooling zone, the adsorption zone, the preheating zone, and the regeneration zone, the remaining adsorbent beds are respectively located in the cooling zone, the adsorption zone, the preheating zone, and the regeneration zone, so that at least two steps of cooling, adsorption, preheating, and regeneration of the adsorbent bed are performed simultaneously at a certain time, resulting in higher efficiency.

[0015] Optionally, the adsorbent beds are two opposite each other along the radial direction of the outer shell, or the adsorbent beds are four located in the cooling zone, the adsorption zone, the preheating zone, and the regeneration zone respectively. Each adsorbent bed enters the cooling zone, adsorption zone, preheating zone, and regeneration zone sequentially along the circumference of the outer shell to complete cooling, adsorption, preheating, and regeneration. The four adsorbent beds alternate in the four zones, that is, at a certain moment, the cooling, adsorption, preheating, and regeneration of the adsorbent beds are carried out simultaneously inside the outer shell, which is more efficient.

[0016] Optionally, the rotary low-temperature adsorption regeneration device with flue gas cooling function includes: a preheating pipe, which is located in the preheating zone or embedded in the outer shell wall corresponding to the preheating zone, for preheating the adsorbent; a heating pipe, which is located in the regeneration zone or embedded in the outer shell wall corresponding to the regeneration zone, for heating the adsorbent; and a cooling pipe, which is located in the cooling zone or embedded in the outer shell wall corresponding to the cooling zone, for cooling the adsorbent.

[0017] Optionally, the cooling pipe has a cooling medium inlet and a cooling medium outlet, and the preheating pipe has a preheating medium inlet and a preheating medium outlet, with the cooling medium outlet connected to the preheating medium inlet. The heat exchange medium flowing out of the cooling pipe has a certain amount of heat due to heat absorption. This portion of the heat exchange medium with a certain amount of heat is input into the preheating pipe, serving as the preheating medium to preheat the adsorbent in the preheating zone. This achieves heat reuse, improves energy utilization efficiency, and helps reduce the overall energy consumption of the rotary flue gas adsorption and regeneration equipment.

[0018] Optionally, the outer casing is provided with a flue gas outlet for discharging purified low-temperature flue gas. The flue gas outlet is connected to the cooling medium inlet of the cooling pipe. A portion of the low-temperature clean flue gas discharged from the flue gas outlet enters the cooling pipe to cool the adsorbent located in the cooling zone. The remaining low-temperature clean flue gas is discharged through the chimney to make full use of the cooling capacity in the low-temperature clean flue gas.

[0019] Optionally, the adsorbent bed is cooled to 50°C-100°C in the cooling zone, and / or the adsorbent bed is preheated to 80°C-150°C in the preheating zone, and / or the adsorbent bed is heated to 250°C-350°C in the regeneration zone. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the rotary flue gas adsorption and regeneration device provided in an embodiment of the present invention.

[0021] Figure 2 This is a cross-sectional view of the rotary flue gas adsorption tower AA provided in an embodiment of the present invention.

[0022] Figure 3 This is a cross-sectional view of the rotary flue gas adsorption and regeneration device provided in an embodiment of the present invention.

[0023] Figure label:

[0024] 110 Outer shell, 111 Adsorption zone, 112 Preheating zone, 113 Regeneration zone, 114 Cooling zone, 115 Adsorbent bed, 120 Inner shell, 121 Flue gas cooling chamber, 122 Flue gas inlet, 123 Flue gas outlet, 124 Fixed shell, 1241 First outlet, 125 Rotating shell, 1251 Second outlet, 131 Flue gas outlet, 132 Regeneration gas outlet

[0025] Packing layer 210, cooling water spray nozzle 220,

[0026] First heat insulation board 301, second heat insulation board 302

[0027] Preheating pipe 400, preheating medium inlet 401, preheating medium outlet 402

[0028] Heating element 500, heating medium inlet 501, heating medium outlet 502

[0029] Cooling pipe 600, cooling medium inlet 601, cooling medium outlet 602

[0030] Air preheater 700, hot side inlet 710, cold side inlet 720, cold side outlet 730, blower 800. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following is based on Figures 1-3This invention describes a rotary flue gas adsorption and regeneration device with flue gas cooling function provided in an embodiment of the present invention. The rotary flue gas adsorption and regeneration device includes a shell 110, an inner shell 120, a flue gas cooling module, and an adsorbent bed 115.

[0033] The inner shell 120 is located inside the outer shell 110, and the axial direction of the inner shell 120 is parallel to the axial direction of the outer shell 110. The inner shell 120 and the outer shell 110 are spaced apart from each other radially. The space between the outer shell 110 and the inner shell 120 is divided into at least an adsorption zone 111 and a regeneration zone 113 in the circumferential direction of the outer shell 110. The circumferential direction of the outer shell 110 is the same as that of the inner shell 120. Figure 1 In the embodiment shown, both the outer shell 110 and the inner shell 120 are cylindrical and coaxially arranged, and are spaced apart in the radial direction, with the adsorption zone 111 and the regeneration zone 113 located in the interval.

[0034] The inner cavity of the inner shell 120 forms a flue gas cooling chamber 121, which has a flue gas inlet 122 and a flue gas outlet 123. The flue gas outlet 123 is connected to the adsorption zone 111. A flue gas cooling module is located inside the flue gas cooling chamber 121 and is used to cool the flue gas entering the flue gas cooling chamber 121 from the flue gas inlet 122 into low-temperature flue gas with a temperature below room temperature. The flue gas outlet 123 is used to discharge the cooled low-temperature flue gas into the adsorption zone 111.

[0035] The adsorbent bed 115 is located between the outer shell 110 and the inner shell 120 and can rotate around the outer shell 110 so that it can enter the adsorption zone 111 and the regeneration zone 113 in sequence. The adsorbent bed 115 contacts the low-temperature flue gas in the adsorption zone 111 to adsorb and purify the low-temperature flue gas. The adsorbent bed 115 is heated and regenerated in the regeneration zone 113.

[0036] Specifically, in adsorption zone 111, the adsorbent contacts and adsorbs the low-temperature flue gas, removing pollutants from the flue gas. The purified low-temperature flue gas is then discharged from the casing 110 through flue gas outlet 131. The saturated adsorbent is transferred to regeneration zone 113, heated to the regeneration temperature, and desorbed. The resulting regeneration gas is discharged from regeneration gas outlet 132. The desorbed adsorbent bed 115 rotates circumferentially back into adsorption zone 111 to participate in the adsorption of low-temperature flue gas again.

[0037] The rotary low-temperature adsorption and regeneration device with flue gas cooling function provided by this invention integrates the flue gas cooling module, the flue gas adsorption zone, and the adsorbent regeneration zone into a single tower. This allows for the cooling of flue gas, the adsorption of low-temperature flue gas, and the regeneration of the adsorbent within a single integrated housing. Compared with related technologies, this eliminates the need for separate spray cooling towers, adsorption towers, and regeneration towers, reducing the number of devices required for low-temperature flue gas adsorption and regeneration, as well as the overall system footprint. It features high integration, for example, saving at least 30% of the floor space.

[0038] The highly integrated adsorption-regeneration equipment eliminates the need for transporting adsorbent between the adsorption and regeneration towers. The adsorbent circulates between the adsorption and regeneration zones, reducing transport time and costs. Simultaneously, it eliminates the need for pipelines transporting flue gas from the spray cooling tower to the adsorption tower. The low-temperature flue gas, cooled by the flue gas cooling module, is directly sent into the adsorption zone for adsorption, shortening the transport distance, saving transport time, improving adsorption-regeneration efficiency, eliminating the construction costs of flue gas transport pipelines, avoiding heat loss during transport, and enhancing the low-temperature adsorption effect, ultimately achieving near-zero emissions.

[0039] In some embodiments, such as Figure 1 As shown, the rotary flue gas adsorption and regeneration equipment includes a first heat insulation plate 301 and a second heat insulation plate 302. The first heat insulation plate 301 and the second heat insulation plate 302 are both located in the gap between the outer shell 110 and the inner shell 120. The first heat insulation plate 301 and the second heat insulation plate 302 extend along the axial direction of the outer shell 110 and are spaced apart in the circumferential direction of the outer shell 110. The adsorbent bed 115 is disposed between the first heat insulation plate 301 and the second heat insulation plate 302. The first heat insulation plate 301 and the second heat insulation plate 302 are movably disposed in the circumferential direction of the outer shell 110 to drive the adsorbent bed 115 to move in the circumferential direction of the outer shell 110 and enter the adsorption zone 111 and the regeneration zone 113 in sequence.

[0040] In some alternative embodiments, the first heat insulation plate 301 and the second heat insulation plate 302 can be moved circumferentially along the housing 110 by cooperating with a track extending circumferentially along the housing 110, and a drive motor can be used to power the movement of the first heat insulation plate 301 and the second heat insulation plate 302.

[0041] In some alternative embodiments, the inner shell 120 includes a fixed shell 124 and a rotating shell 125, such as Figure 1 As shown, the rotating shell 125 is fitted over the fixed shell 124 and rotatably arranged around the fixed shell 124. The first heat insulation plate 301 and the second heat insulation plate 302 are both connected to the rotating shell 125 and move circumferentially along the outer shell 110 under the drive of the rotating shell 125. Figure 1 In the embodiment shown, both the fixed shell 124 and the rotating shell 125 are vertically arranged cylindrical structures. The first heat insulation plate 301 and the second heat insulation plate 302 are fixedly connected to the outer peripheral surface of the rotating shell 125, and both the first heat insulation plate 301 and the second heat insulation plate 302 extend radially along the outer shell 110. The adsorbent bed 115 is located between the first heat insulation plate 301 and the second heat insulation plate 302 in the circumferential direction of the outer shell 110.

[0042] The flue gas cooling module is located inside the fixed housing 124, which has a first outlet 1241. The rotating housing 125 has a second outlet 1251 opposite to the adsorbent bed 115. When the adsorbent bed 115 reaches the adsorption zone 111 as the rotating housing 125 rotates, the first outlet 1241 of the fixed housing 124 and the second outlet 1251 of the rotating housing 125 are opposite to each other to form a flue gas outlet 123. As the adsorbent bed 115 leaves the adsorption zone 111 as the rotating housing 125 rotates, the first outlet 1241 is gradually blocked by the rotating housing 125.

[0043] The rotating shell 125 rotates around the fixed shell 124, causing the first heat insulation plate 301, the second heat insulation plate 302, and the adsorbent bed 115 to move. When the adsorbent bed 115 moves to the adsorption zone 111, the second outlet 1251 on the rotating shell 125 and the first outlet 1241 on the fixed shell 124 are radially opposite each other, forming a flue gas outlet 123 connecting the flue gas cooling chamber 121 and the adsorption zone 111. Low-temperature flue gas enters the adsorbent bed 115 in the adsorption zone 111 through the flue gas outlet 123 and comes into contact with the adsorbent in the adsorbent bed 115, where pollutants in the flue gas are adsorbed. The rotating shell 125 continues to rotate. At this time, because the rotating shell 125 rotates relative to the fixed shell 124, the first outlet 1241 on the fixed shell 124 is gradually blocked by the rotating shell 125. The first outlet 1241 and the second outlet 1251 gradually become misaligned, and the flue gas can no longer enter the adsorption zone 111, ending the adsorption stage.

[0044] In some specific embodiments, such as Figures 1-3 As shown, the flue gas cooling module is a flue gas spraying module, including a packing layer 210 and cooling water spray nozzles 220. The packing layer 210 is located inside the flue gas cooling chamber 121, the inlet 122 is located below the packing layer 210, and the outlet 123 is located above the packing layer 210. The cooling water spray nozzles 220 extend into the inner shell 120 and spray cooling water onto the packing layer 210. The cooling water comes into contact with the flue gas inside the packing layer 210, and the flue gas is cooled to below zero. The low-temperature flue gas flows upward and is discharged from the flue gas cooling chamber 121 through the outlet 123.

[0045] Furthermore, in some embodiments, such as Figure 1 As shown, the space between the outer shell 110 and the inner shell 120 also includes a cooling zone 114 and a preheating zone 112. The cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113 are arranged sequentially in the circumferential direction of the outer shell 110. The adsorbent bed 115 is rotatable along the circumferential direction of the outer shell 110 so as to sequentially enter the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113. The adsorbent bed 115 is cooled in the cooling zone 114, contacts the low-temperature flue gas in the adsorption zone 111 to adsorb and purify the low-temperature flue gas, is preheated in the preheating zone 112, and is heated to the regeneration temperature in the regeneration zone 113.

[0046] Specifically, in adsorption zone 111, the adsorbent comes into contact with the low-temperature flue gas and adsorbs it, removing pollutants from the low-temperature flue gas. The adsorbed low-temperature clean flue gas is discharged from the casing 110 through the flue gas outlet 131. The adsorbent that is saturated with adsorption is moved to the preheating zone 112 for preheating. The preheated adsorbent enters the regeneration zone 113 and is heated to the regeneration temperature before desorption. The desorbed high-temperature adsorbent then enters the cooling zone 114 for cooling. The cooled low-temperature adsorbent then enters the adsorption zone 111 along the circumference of the casing 110 to participate in the adsorption of low-temperature flue gas again.

[0047] In the above embodiments, adsorption, regeneration, and cooling are integrated, with adsorption, regeneration, and cooling of the adsorbent completed within a single integrated housing. This reduces the number of devices required for flue gas adsorption and regeneration, as well as the floor space occupied. A multi-stage heating method is used for adsorbent regeneration: the adsorbent is first preheated in a preheating zone, and then heated in the regeneration zone. This reduces the temperature rise range of the adsorbent within the regeneration zone, which helps lower the energy consumption and operating costs of the adsorption and regeneration equipment. The cooling zone cools the high-temperature adsorbent after regeneration, lowering the temperature of the adsorbent in contact with the low-temperature flue gas in the adsorption zone. Low-temperature adsorbents have strong adsorption efficiency; therefore, the inclusion of a cooling zone helps improve the adsorption efficiency of the adsorption tower.

[0048] exist Figure 1 In the specific embodiment shown, the central angles of the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113 are all 90 degrees. The included angle between the first heat insulation plate 301 and the second heat insulation plate 302 is 90 degrees. Driven by the first heat insulation plate 301 and the second heat insulation plate 302, the adsorbent bed 115 sequentially enters the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113, respectively completing cooling, adsorption, preheating, and regeneration. It should be noted that when the adsorbent bed 115 has completely reached the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113, that is, when the first heat insulation plate 301, the second heat insulation plate 302, and the adsorbent bed 115 between them are all located in the same area, it needs to stay for a preset time in order to complete cooling, adsorption, preheating, and regeneration. After the process is completed, the rotating shell 125 drives the first heat insulation plate 301, the second heat insulation plate 302, and the adsorbent bed 115 to move to the next area.

[0049] In other alternative embodiments, the central angles corresponding to the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113 can be other than 360°. Furthermore, the angle between the first heat insulation plate 301 and the second heat insulation plate 302 can be less than 90 degrees. Therefore, when the first heat insulation plate 301 and the second heat insulation plate 302 drive the adsorbent bed 115 to rotate and move, they can remain within a certain area for a certain period of time. For example, if the central angle corresponding to the cooling zone 114 is 100° and the angle between the first heat insulation plate 301 and the second heat insulation plate 302 is 50°, then the first heat insulation plate 301 and the second heat insulation plate 302 need to move for a certain period of time to move from the cooling zone 114 to the next zone. Therefore, by controlling the rotation speed of the rotating shell 125, the cooling, adsorption, preheating, and regeneration processes can be completed without making it completely stationary. By adjusting the rotation speed, the duration of cooling, adsorption, preheating, and regeneration can be flexibly adjusted.

[0050] In other embodiments, there may be multiple adsorbent beds 115, with heat insulation plates provided between them. That is, the multiple adsorbent beds 115 are spaced apart by heat insulation plates in the circumferential direction of the outer casing 110. When one of the multiple adsorbent beds 115 is located in one of the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113, the remaining adsorbent beds 115 are located in the corresponding zones of the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113, respectively.

[0051] For example, there are two adsorbent beds 115 that are radially opposite each other along the outer shell 110. When one adsorbent bed 115 is in the adsorption zone 111 for adsorption, the other adsorbent bed 115 is in the regeneration zone 113 for regeneration; when one adsorbent bed 115 is in the preheating zone 112 for preheating, the other adsorbent bed 115 is in the cooling zone 114 for cooling.

[0052] Alternatively, the adsorbent beds 115 may be two adjacent beds circumferentially adjacent to the outer casing 110. While one adsorbent bed 115 is located in the adsorption zone 111 for adsorption, the other adsorbent bed 115 is located in the cooling zone 114 or in the preheating zone 112, and so on.

[0053] Alternatively, there may be four adsorbent beds 115 located in the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113, respectively. Each adsorbent bed 115 sequentially enters the cooling zone 114, adsorption zone 111, preheating zone 112, and regeneration zone 113 along the circumference of the outer shell 110 to complete cooling, adsorption, preheating, and regeneration. The four adsorbent beds 115 alternate within the four zones, meaning that at any given time, cooling, adsorption, preheating, and regeneration of the adsorbent beds 115 are simultaneously occurring within the outer shell 110, resulting in higher efficiency.

[0054] Preferably, the temperature of the low-temperature flue gas is below zero, for example, -80℃ to -5℃.

[0055] More preferably, the temperature of the low-temperature flue gas is -20℃ to -5℃. The inventors have discovered through research that lower flue gas temperatures are more beneficial for adsorption and purification. However, excessively low flue gas temperatures lead to complex equipment structures for cooling the flue gas, increased energy consumption, and for example, the need for insulation layers in the cooling equipment, adsorption tower, and pipelines, as well as high sealing requirements, resulting in increased costs. Furthermore, excessively low temperatures cause condensation to easily form inside the adsorption tower, leading to adsorbent adhesion and blockage, thus affecting adsorption. Therefore, cooling the flue gas to a temperature of -20℃ to -5℃ is advantageous.

[0056] In some embodiments, the preheating temperature of the preheating zone 112 is 80°C-150°C, and / or the cooling temperature of the cooling zone 114 is 50°C-100°C, and / or the regeneration temperature of the regeneration zone 113 is 250°C-350°C.

[0057] In one specific embodiment, the preheating temperature of the preheating zone 112 is 100°C, the cooling temperature of the cooling zone 114 is 80°C, and the regeneration temperature of the regeneration zone 113 is 300°C.

[0058] In some embodiments, the rotary flue gas adsorption regeneration device includes a preheating pipe 400, a heating pipe 500, and a cooling pipe 600. The preheating pipe 400 is located within the preheating zone 112 or embedded in the wall of the corresponding outer casing 110, and is used to preheat the adsorbent. The heating pipe 500 is located within the adsorption zone 111 or embedded in the wall of the corresponding outer casing 110, and is used to heat the adsorbent. Regeneration gas is discharged from the outer casing 110 through the regeneration gas outlet 132. The cooling pipe 600 is located within the cooling zone 114 or embedded in the corresponding outer casing 110, and is used to cool the adsorbent.

[0059] In some alternative embodiments, the preheating tube 400, the heating tube 500, and the cooling tube 600 operate as follows: Figure 2 and Figure 3The preheating pipe 400, heating pipe 500, and cooling pipe 600 extend into the outer casing 110 to contact the adsorbent bed 115, thereby increasing the contact area with the adsorbent, making heat exchange more uniform, and improving heat exchange efficiency. It should be noted that when the adsorbent bed 115 moves, the preheating pipe 400, heating pipe 500, and cooling pipe 600 need to be withdrawn from the outer casing 110 to avoid obstructing the movement of the adsorbent bed 115.

[0060] Cooling pipe 600 has a cooling medium inlet 601 and a cooling medium outlet 602. Preheating pipe 400 has a preheating medium inlet 401 and a preheating medium outlet 402. Heating pipe 500 has a heating medium inlet 501 and a heating medium outlet 502. Cooling medium flows through the tube side of cooling pipe 600, exchanging heat with the adsorbent on the shell side. The adsorbent's temperature decreases due to heat exchange, while the cooling medium's temperature increases. Preheating pipe 400 has a preheating medium flowing through its tube side, exchanging heat with the adsorbent on the shell side. The adsorbent's temperature increases due to heat exchange, while the preheating medium's temperature decreases. Heating pipe 500 has a heating medium flowing through its tube side, exchanging heat with the adsorbent on the shell side. The adsorbent's temperature increases due to heat exchange, while the heating medium's temperature decreases.

[0061] It is understandable that the heat exchange medium and adsorbent in the preheating tube 400, heating tube 500 and cooling tube 600 are all for indirect heat exchange.

[0062] In some embodiments, such as Figure 3 As shown, the cooling medium outlet 602 of the cooling pipe 600 is connected to the preheating medium inlet 401 of the preheating pipe 400. The heat exchange medium flowing out of the cooling pipe 600 has a certain amount of heat due to heat absorption. This portion of the heat exchange medium with a certain amount of heat is input into the preheating pipe 400 to preheat the adsorbent in the preheating zone 112. In these embodiments, the heat exchange medium flowing out of the cooling pipe 600 is input into the preheating pipe 400 to achieve heat reuse, improve energy utilization efficiency, and help reduce the overall energy consumption of the rotary flue gas adsorption regeneration equipment.

[0063] Furthermore, in some embodiments, such as Figure 3 As shown, in addition to the cooling medium outlet 602, the heating medium outlet 502 of the heating tube 500 is connected to the preheating medium inlet 401 of the preheating tube 400, and the heating medium in the heating tube 500 and the cooling medium in the cooling tube 600 can be mixed in a certain proportion before entering the preheating tube 400. This is because the medium output from the heating tube 500 still has a large amount of usable heat. To avoid insufficient preheating temperature in the preheating tube 400, part of the heating medium output from the heating tube 500 is added to the preheating tube 400 to ensure that the preheating temperature of the preheating zone 112 reaches the set temperature value.

[0064] The low-temperature clean flue gas discharged from the flue gas outlet 131 into the casing 110 contains a large amount of cold energy. In order to utilize the cold energy in the low-temperature clean flue gas, in some embodiments, such as Figure 2 and Figure 3 As shown, the flue gas outlet 131 is connected to the cooling medium inlet 601 of the cooling pipe 600. A portion of the low-temperature clean flue gas discharged from the flue gas outlet 131 enters the cooling pipe 600 to cool the adsorbent located in the cooling zone 114. The remaining low-temperature clean flue gas is discharged through the chimney.

[0065] In some embodiments, the heat from the heating element 200 is recovered from the heat of the high-temperature flue gas in the economizer. For example... Figure 2 As shown, the rotary flue gas adsorption regeneration equipment also includes an air preheater 700 and a blower 800. The hot-side inlet 710 of the air preheater 700 is connected to the high-temperature flue gas outlet of the economizer, and the cold-side inlet 720 of the air preheater 700 is connected to the blower 800. The high-temperature flue gas exchanges heat with the cold air to heat it into high-temperature air. The cold-side outlet 730 of the air preheater 700 is connected to the heating medium inlet 501 of the heating tube 200. The high-temperature air enters the heating tube 500 from the heating medium inlet 501 to heat the adsorbent, thereby completing the desorption of the adsorbent.

[0066] In other alternative embodiments, the heat from the heating tube 200 is converted from electrical energy. For example, a rotary flue gas adsorption regeneration device further includes a heater and an outer heating tube, which are connected to the heating tube to form a heating circuit, in which the heat exchange medium circulates back. The heater is located on the outer heating tube and is used to heat the heat exchange medium in the heating circuit. The heater is an electric heater.

[0067] As an example, in Figures 1-3 In the illustrated embodiment, the preheating zone 112 and the cooling zone 114 are radially opposite to each other in the outer casing 110, and the regeneration zone 113 and the adsorption zone 111 are radially opposite to each other in the outer casing 110. The central angles of the cooling zone 114, the adsorption zone 111, the preheating zone 112, and the regeneration zone 113 are all 90 degrees.

[0068] like Figure 2 and Figure 3 As shown, in order to increase the contact area with the adsorbent bed 115, the preheating pipe 400, the heating pipe 500 and the cooling pipe 600 are all serpentine pipes.

[0069] In this embodiment, the flue gas outlet 131 is connected to the cooling medium inlet 601 of the cooling pipe 600, and the low-temperature clean flue gas flows into the cooling pipe 600 through the pipe. In the cooling zone 114, the low-temperature clean flue gas (cooling medium) in the cooling pipe 600 exchanges heat with the high-temperature adsorbent, the high-temperature adsorbent is cooled, and the temperature of the low-temperature clean flue gas rises. The cooling medium outlet 602 of the cooling pipe 600 is connected to the preheating medium inlet 401 of the preheating pipe 400, and the clean flue gas with a certain amount of heat flowing out of the cooling pipe 600 enters the preheating pipe 400.

[0070] The heating medium in heating element 500 is high-temperature air, such as Figure 3 As shown, the heating medium outlet 502 of the heating tube 500 is connected to the preheating medium inlet 401. After heat exchange, the air with a certain amount of residual heat and the clean flue gas with a certain amount of heat are mixed in a certain proportion and enter the preheating tube 400 to ensure that the preheating temperature of the preheating zone 112 meets the standard. The gas discharged from the preheating medium outlet 402 can be vented.

[0071] As an example, the rotary flue gas adsorption and regeneration equipment provided in this embodiment of the invention is a step-type moving device. During the adsorption period, the adsorbent bed 115 is confined in the adsorption zone 111 by the heat insulation plate for adsorption. After the adsorbent bed 115 is saturated with adsorption for a certain period of time, the rotating shaft 701 rotates to drive the saturated adsorbent bed 115 into the preheating zone 112 for preheating. After preheating for a certain period of time, the rotating shaft 701 continues to rotate to drive the adsorbent bed 115 into the regeneration zone 113 for regeneration. After regeneration, the rotating shaft 701 rotates to drive the adsorbent bed 115 into the cooling zone 114 for cooling. After cooling for a certain period of time, the rotating shaft 701 rotates to send the cooled adsorbent bed 115 back into the adsorption zone 111, and adsorption continues. It can be understood that the rotary flue gas adsorption and regeneration equipment is an intermittent adsorption device; only during the adsorption period can low-temperature flue gas enter the adsorption zone 111 for adsorption. The rotation interval of the turntable is related to the preset time of each process, and the intermittent rotation of the turntable can be precisely achieved through automation.

[0072] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0076] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0077] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A rotary low-temperature adsorption and regeneration device with flue gas cooling function, characterized in that, include: The outer shell and the inner shell are located inside the outer shell. The axial direction of the inner shell is parallel to the axial direction of the outer shell. The inner shell and the outer shell are spaced apart from each other along their radial directions. The space between the outer shell and the inner shell is divided into an adsorption zone and a regeneration zone in the circumferential direction of the outer shell. The inner cavity of the inner shell forms a flue gas cooling chamber. The flue gas cooling chamber has a flue gas inlet and a flue gas outlet. The flue gas outlet communicates with the adsorption zone. A flue gas cooling module is located inside the flue gas cooling chamber and is used to cool the flue gas entering from the flue gas inlet into low-temperature flue gas with a temperature below room temperature. The flue gas outlet is used to discharge the low-temperature flue gas into the adsorption zone. An adsorbent bed is disposed between the outer shell and the inner shell and is rotatable along the circumference of the outer shell so as to sequentially enter the adsorption zone and the regeneration zone. The adsorbent bed contacts the low-temperature flue gas in the adsorption zone to adsorb and purify the low-temperature flue gas, and the adsorbent bed is heated and regenerated in the regeneration zone. It also includes a first heat insulation plate and a second heat insulation plate, the first heat insulation plate and the second heat insulation plate are located in the gap between the outer shell and the inner shell, the first heat insulation plate and the second heat insulation plate extend along the axial direction of the outer shell and are spaced apart in the circumferential direction of the outer shell, the adsorbent bed is disposed between the first heat insulation plate and the second heat insulation plate, and the first heat insulation plate and the second heat insulation plate are movably disposed along the circumferential direction of the outer shell to drive the adsorbent bed to move along the circumferential direction of the outer shell; The inner shell includes a fixed shell and a rotating shell. The rotating shell is fitted over the fixed shell and can rotate around the fixed shell. The first heat insulation plate and the second heat insulation plate are connected to the rotating shell and move circumferentially along the outer shell under the drive of the rotating shell. The flue gas cooling module is located inside the fixed shell. The fixed shell is provided with a first outlet, and the rotating shell is provided with a second outlet opposite to the adsorbent bed. When the adsorbent bed rotates with the rotating shell to reach the adsorption zone, the first outlet and the second outlet are opposite to each other to form the flue gas outlet. When the adsorbent bed rotates with the rotating shell to leave the adsorption zone, the first outlet is blocked by the rotating shell.

2. The rotary low-temperature adsorption and regeneration equipment with flue gas cooling function according to claim 1, characterized in that, The outer shell is cylindrical, the inner shell is tubular, and the outer shell and the inner shell are coaxially arranged.

3. The rotary low-temperature adsorption and regeneration equipment with flue gas cooling function according to claim 1, characterized in that, The space between the outer shell and the inner shell also includes a cooling zone and a preheating zone. The cooling zone, the adsorption zone, the preheating zone and the regeneration zone are arranged sequentially in the circumferential direction of the outer shell. The adsorbent bed is rotatable along the circumferential direction of the outer shell so as to enter the cooling zone, the adsorption zone, the preheating zone and the regeneration zone in sequence. The adsorbent bed is cooled in the cooling zone and preheated in the preheating zone.

4. The rotary low-temperature adsorption and regeneration equipment with flue gas cooling function according to claim 3, characterized in that, There are multiple adsorbent beds, and heat insulation plates are provided between the multiple adsorbent beds. When one of the multiple adsorbent beds is located in one of the cooling zone, the adsorption zone, the preheating zone and the regeneration zone, the remaining adsorbent beds are respectively located in the cooling zone, the adsorption zone, the preheating zone and the regeneration zone.

5. The rotary low-temperature adsorption and regeneration equipment with flue gas cooling function according to claim 4, characterized in that, The adsorbent beds are two opposite each other along the radial direction of the outer shell, or the adsorbent beds are four located in the cooling zone, the adsorption zone, the preheating zone and the regeneration zone respectively.

6. The rotary low-temperature adsorption regeneration device with flue gas cooling function according to any one of claims 3-5, characterized in that, include: A preheating tube, which is located in the preheating zone or embedded in the outer shell wall corresponding to the preheating zone, is used to preheat the adsorbent. A heating element, located within the regeneration zone or embedded in the outer shell wall corresponding to the regeneration zone, is used to heat the adsorbent. A cooling pipe, located within the cooling zone or embedded in the outer shell wall corresponding to the cooling zone, is used to cool the adsorbent.

7. The rotary low-temperature adsorption and regeneration equipment with flue gas cooling function according to claim 6, characterized in that, The cooling pipe has a cooling medium inlet and a cooling medium outlet, and the preheating pipe has a preheating medium inlet and a preheating medium outlet. The cooling medium outlet is connected to the preheating medium inlet. The outer casing is provided with a flue gas outlet for discharging purified low-temperature flue gas, and the flue gas outlet is connected to the cooling medium inlet of the cooling pipe.

8. The rotary low-temperature adsorption regeneration device with flue gas cooling function according to any one of claims 3-5, characterized in that, The adsorbent bed is cooled to 50°C-100°C in the cooling zone, and / or the adsorbent bed is preheated to 80°C-150°C in the preheating zone, and / or the adsorbent bed is heated to 250°C-350°C in the regeneration zone.

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