Adsorption unit with inclined movement of adsorbent

Abstract

The application discloses an adsorption unit with inclined movement of adsorbents, which comprises a tower cylinder, and has an adsorption cavity in the tower cylinder. The bottom wall surface of the adsorption cavity is an inclined surface inclined to a horizontal surface. At least part of the adsorbents in the adsorption cavity is moved along the bottom wall surface of the adsorption cavity to a discharge port and discharged through the discharge port. At least part of low-temperature flue gas with a temperature below room temperature entering the adsorption cavity through a flue gas inlet flows towards a flue gas outlet in a direction opposite to the moving direction of the adsorbents to form countercurrent, or flows towards the flue gas outlet in a direction orthogonal to the moving direction of the adsorbents to form cross flow. The adsorption unit provided by the application conforms to the inclined flow rule of flue gas, enables the adsorbents and the flue gas to realize cross flow and countercurrent to a greater extent, balances the amount of flue gas contacted by the adsorbents at different positions of the adsorption bed within a unit time to the maximum extent, reduces or even avoids invalid zones in the adsorption bed, and reduces the adsorption cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of adsorption technology, and in particular to an adsorption unit with inclined movement of adsorbent. BACKGROUND

[0002] The basic principle of the adsorption technology of flue gas is to remove the pollutant components from the flue gas by the adsorption principle of adsorbent. The flue gas adsorption system in the related art adopts an adsorption tower for adsorption purification of flue gas, and the adsorption tower is provided with an adsorption cavity, and the adsorption cavity is stacked with an adsorption bed for adsorption purification of flue gas. According to the relationship between the flow mode of flue gas in the adsorption cavity and the movement mode of adsorbent, the adsorption bed is classified, and the common adsorption bed in the related art includes a counter-flow adsorption bed and a counter-current adsorption bed. In the conventional counter-current adsorption bed and counter-flow adsorption bed, the adsorbent moves in the vertical direction downward, but due to the uncontrollability of flue gas, the flue gas cannot completely form counter-flow with the adsorbent according to the vertical upward flow path, or completely flow along the horizontal direction to form counter-flow with the adsorbent, so that the adsorbent at different positions in the adsorption bed has a difference in the amount of flue gas contacted in unit time, and it may also cause the formation of an invalid zone in the adsorption bed which does not contact with the flue gas, thereby increasing the adsorption cost. SUMMARY

[0003] The present application is made based on the discovery and understanding of the inventors on the following facts and problems:

[0004] The inventors simulated the flow field of flue gas in four adsorption cavities arranged at intervals in the vertical direction through CFD numerical simulation. As a model, the flue gas inlet and the flue gas outlet of each adsorption cavity are arranged diagonally relative to the adsorption cavity, and the flue gas outlet is located above the flue gas inlet, and the adsorption cavity is stacked with a counter-current adsorption bed. As shown in Figure 1 , the flue gas in the four adsorption cavities all presents a certain non-uniformity, specifically, the flue gas in each adsorption cavity presents a certain inclined flow trend to different extents, resulting in different amounts of flue gas contacted by the adsorbent at different positions of the adsorption bed, such as the adsorbent at the center of the adsorption bed contacts more flue gas than the adsorbent away from the center of the adsorption bed, and also causes the formation of an invalid zone which does not contact with the flue gas at the side wall of the adjacent adsorption cavity.

[0005] In addition, conventional flue gas adsorption is usually high-temperature adsorption, that is, the flue gas discharged by a boiler is cooled to about 200 DEG C by a cooling tower and then enters a flue gas adsorption tower for high-temperature adsorption purification. High-temperature adsorption has problems of large adsorbent consumption, poor adsorption effect, high content of nitrogen oxides in the purified flue gas after adsorption, and inability to achieve near-zero emission. In order to overcome the problems of high-temperature adsorption, the related technology proposes a flue gas low-temperature adsorption technology, that is, the flue gas is cooled to low-temperature flue gas below room temperature, and then the pollutants in the flue gas are removed by adsorption. In low-temperature adsorption, the adsorption capacity of the adsorbent is multiplied in a low-temperature environment, which greatly improves the adsorption purification rate compared with conventional high-temperature flue gas adsorption, and can achieve near-zero emission of flue gas. However, the inventors have realized through research that, compared with conventional high-temperature adsorption, the diffusion rate of low-temperature flue gas is lower than that of high-temperature flue gas in the low-temperature adsorption process, which will further lead to uncontrollability of flue gas flow and more significant imbalance of contact between the adsorbent and the flue gas.

[0006] The present application aims to at least partially solve one of the technical problems in the related art. To this end, an embodiment of the present application provides an adsorbent inclined movement adsorption unit.

[0007] The adsorbent inclined movement adsorption unit provided by the embodiment of the present application comprises a tower barrel having an adsorption cavity therein, the tower barrel having a feeding port, a discharging port, a flue gas inlet and a flue gas outlet communicating with the adsorption cavity, the bottom wall surface of the adsorption cavity being an inclined surface inclined relative to a horizontal plane, the feeding port being located above the bottom wall surface, the discharging port being located on a side of the bottom wall surface where the bottom wall surface is lower, so that at least part of the adsorbent fed into the adsorption cavity through the feeding port moves along the bottom wall surface of the adsorption cavity to the discharging port and is discharged, and the flue gas inlet is located below the flue gas outlet and communicates with the bottom of the adsorption cavity, so that at least part of the low-temperature flue gas at a temperature below room temperature entering the adsorption cavity through the flue gas inlet flows towards the flue gas outlet in a direction opposite to the moving direction of the adsorbent to form a counterflow, or flows towards the flue gas outlet in a direction orthogonal to the moving direction of the adsorbent to form a crossflow.

[0008] The bottom wall surface of the adsorption cavity of the adsorption unit provided by the embodiment of the present application is designed as an inclined surface inclined relative to a horizontal plane, which replaces the regularity of vertical downward flow of the adsorbent in the counterflow bed structure and the crossflow bed structure in the conventional technology. In the adsorption unit provided by the embodiment of the present application, the adsorbent slides or rolls along the bottom wall surface of the adsorption cavity inclined relative to a horizontal plane during movement to the discharging port, so as to conform to the inclined flow regularity of the flue gas and achieve a greater degree of crossflow and counterflow with the flue gas, thereby balancing the amount of flue gas contacted by the adsorbent at different positions of the adsorption bed per unit time to the maximum extent, reducing or even avoiding the dead zone in the adsorption bed, and reducing the adsorption cost.

[0009] Further, the adsorption unit provided by the embodiment of the present application is a low-temperature flue gas adsorption unit. The flue gas becomes low-temperature flue gas after being cooled, and the low-temperature flue gas is in contact with the adsorbent to perform low-temperature physical adsorption, so that the adsorption efficiency is greatly improved.

[0010] In some embodiments, on the longitudinal section of the tower drum, the feeding port and the discharging port are arranged on the diagonal of the tower drum, so that the upper surface of the adsorption bed formed by the adsorbent stack in the adsorption cavity is an inclined surface, and the inclination direction of the upper surface of the adsorption bed is consistent with the inclination direction of the bottom wall surface, thereby balancing the contact time of the flue gas and the adsorbent, and making the adsorption result of the flue gas more uniform.

[0011] In some embodiments, the discharging port is arranged on the side wall of the tower drum and adjacent to the bottom surface of the tower drum or is arranged on the bottom surface of the tower drum; and / or, the feeding port is arranged on the side wall of the tower drum and adjacent to the top surface of the tower drum or is arranged on the top surface of the tower drum. In this way, on the longitudinal section of the tower drum, the feeding port and the discharging port are arranged on the diagonal of the tower drum, so that the moving path of the adsorbent can correspond to the inclined flow rule of the flue gas, and the adsorption result of the flue gas is more uniform.

[0012] In some embodiments, the flue gas inlet is located on the side of the bottom wall surface of the adsorption cavity that is lower, and on the longitudinal section of the tower drum, the flue gas outlet and the flue gas inlet are arranged on the diagonal of the tower drum, so that at least part of the low-temperature flue gas entering the adsorption cavity through the flue gas inlet forms a counter flow with the adsorbent. Since the low-temperature flue gas has an inclined flow rule, part of the low-temperature flue gas flows upward along the extension direction of the bottom wall surface after entering the adsorption cavity, and during this period, the low-temperature flue gas is exactly opposite to the adsorbent moving downward along the extension direction of the bottom wall surface, so that a better counter flow relationship is achieved, the amount of flue gas contacted by the adsorbent per unit time is further balanced, and the dead zone in the adsorption bed is reduced.

[0013] In some embodiments, the flue gas inlet is arranged on the side wall of the tower drum and adjacent to the bottom surface of the tower drum or is arranged on the bottom surface of the tower drum; and / or, the flue gas outlet is arranged on the side wall of the tower drum and adjacent to the top surface of the tower drum or is arranged on the top surface of the tower drum. In this way, on the longitudinal section of the tower drum, the flue gas outlet and the flue gas inlet are arranged on the diagonal of the tower drum, so that the flow direction of the flue gas can correspond to the inclined flow rule of the flue gas, and the flow direction of the flue gas is opposite to the flow direction of the adsorbent to form a counter flow.

[0014] In some embodiments, a plurality of first through holes are formed on the bottom wall surface of the adsorption cavity to form the flue gas inlet, and the axial direction of the first through holes is perpendicular to the bottom wall surface of the adsorption cavity, so that at least part of the low-temperature flue gas entering the adsorption cavity through the first through holes forms a cross flow with the adsorbent. Since the low-temperature flue gas has an inclined flow rule, the low-temperature flue gas does not immediately flow vertically upward after entering the adsorption cavity, but flows upward along a direction having an angle with the vertical direction, and during the flow, the low-temperature flue gas intersects with the adsorbent moving downward along the extension direction of the bottom wall surface, so that a better cross flow relationship is achieved, the amount of flue gas contacted by the adsorbent per unit time is balanced, and the invalid area in the adsorption bed is reduced.

[0015] In some embodiments, the top wall surface of the adsorption cavity is an inclined surface inclined relative to the horizontal plane, and the inclination direction of the top wall surface of the adsorption cavity is consistent with the inclination direction of the bottom wall surface, so that the adsorption cavity as a whole has an inclined structure, and the structure of the adsorption cavity is more reasonable.

[0016] In some embodiments, a plurality of second through holes are formed on the top wall surface of the adsorption cavity to form the flue gas outlet, and the axial direction of the second through holes is perpendicular to the top wall surface of the adsorption cavity, so as to conform to the inclined flow direction of the flue gas, so that the flue gas can be smoothly discharged along the second through holes, and the emission resistance of the cleaned flue gas is reduced.

[0017] In some embodiments, the inclination angle of the bottom wall surface of the adsorption cavity relative to the horizontal plane is 0°-45°, so that the overall height and space utilization of the adsorption unit are within the ideal range under the premise of ensuring the residence time of the adsorbent.

[0018] In some embodiments, the maximum distance between the bottom wall surface of the adsorption cavity and the top wall surface of the adsorption cavity in the vertical direction is 1m-3m, and the thickness of the adsorption bed formed by the adsorbent stack in the adsorption cavity in the vertical direction is 0.8m-2.5m, so that the adsorption unit has a certain adsorption capacity. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the flue gas flow field diagram in the four adsorption cavities obtained by CFD numerical simulation.

[0020] Figure 2 is a sectional view of the adsorption unit provided in Embodiment One of the present application.

[0021] Figure 3 is a sectional view of the adsorption unit provided in Embodiment Two of the present application.

[0022] Figure 4 is a sectional view of the adsorption unit provided in Embodiment Three of the present application.

[0023] Figure 5is a sectional view of the adsorption unit provided in Embodiment Four of the present application.

[0024] Reference signs:

[0025] adsorption unit 100, tower drum 110, adsorption cavity 111, bottom wall surface 1111, top wall surface 1112, feeding port 112, discharging port 113, flue gas inlet 114, flue gas outlet 115, first through hole 116, second through hole 117, adsorption bed 120. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] The following is based on Figures 2-5 The adsorption unit 100 provided in the embodiments of the present application is described. The adsorption unit 100 includes a tower drum 110, the tower drum 110 has an adsorption cavity 111 therein, and the tower drum 110 further has a feeding port 112, a discharging port 113, a flue gas inlet 114 and a flue gas outlet 115 which are in communication with the adsorption cavity 111. The feeding port 112 is used for feeding adsorbent into the adsorption cavity 111, and the adsorbent is stacked to form an adsorption bed 120. The discharging port 113 is used for discharging adsorbent saturated with adsorption in the adsorption cavity 111, and the adsorbent in the adsorption bed 120 tends to flow downward as a whole under the action of gravity. The flue gas inlet 114 is used for introducing low-temperature flue gas with a temperature below room temperature into the adsorption cavity 111, and the flue gas outlet 115 is used for discharging clean flue gas after being adsorbed by the adsorbent.

[0028] The bottom wall surface 1111 of the adsorption cavity 111 is an inclined surface inclined relative to a horizontal plane, the feeding port 112 is located above the bottom wall surface 1111, and the discharging port 113 is located at a lower side of the bottom wall surface 1111 of the adsorption cavity 111, so that at least part of the adsorbent introduced into the adsorption cavity 111 through the feeding port 112 moves along the bottom wall surface 1111 of the adsorption cavity 111 to the discharging port 113 and is discharged. That is, the adsorbent introduced into the adsorption cavity 111 through the feeding port 112 gradually moves in the direction close to the bottom wall surface 1111 of the adsorption cavity 111 under the action of gravity, and since the bottom wall surface 1111 of the adsorption cavity 111 is an inclined surface, the part of the adsorbent close to the bottom wall surface 1111 can slide or roll downward along the bottom wall surface 1111, and finally be discharged from the discharging port 113 located at the lower side of the bottom wall surface 1111 of the adsorption cavity 111.

[0029] The flue gas inlet 114 is located below the flue gas outlet 115 and communicates with the bottom of the adsorption cavity 111, so that at least part of the low-temperature flue gas at a temperature below room temperature entering the adsorption cavity 111 through the flue gas inlet 114 flows toward the flue gas outlet 115 in a direction opposite to the moving direction of the adsorbent to form a counterflow, or flows toward the flue gas outlet 115 in a direction orthogonal to the moving direction of the adsorbent to form a crossflow.

[0030] That is, in some embodiments of the present application, as shown in Figure 2 and Figure 4 , a part of the low-temperature flue gas counterflows with the adsorbent, specifically, the flow direction of the low-temperature flue gas is opposite to the flow direction of the adsorbent. In other embodiments of the present application, as shown in Figure 3 and Figure 5 , a part of the low-temperature flue gas crossflows with the adsorbent, specifically, the flow direction of the low-temperature flue gas is substantially orthogonal to the flow direction of the adsorbent.

[0031] The bottom wall surface of the adsorption cavity of the adsorption unit provided by the embodiments of the present application is designed as an inclined surface inclined relative to the horizontal plane, replacing the regularity that the adsorbent vertically flows downward in the traditional counterflow bed structure and crossflow bed structure. In the adsorption unit provided by the embodiments of the present application, the adsorbent slides or rolls along the bottom wall surface of the adsorption cavity inclined relative to the horizontal plane in the process of moving toward the discharge port, so as to conform to the inclined flow regularity of the flue gas and realize a greater degree of crossflow and counterflow with the flue gas, thereby balancing the amount of flue gas contacted by the adsorbent at different positions of the adsorption bed per unit time to the maximum extent, reducing or even avoiding the dead zone in the adsorption bed, and reducing the adsorption cost.

[0032] In addition, the adsorption unit provided by the embodiments of the present application is a low-temperature flue gas adsorption unit. The flue gas becomes low-temperature flue gas after being cooled, and the low-temperature flue gas contacts the adsorbent to perform low-temperature physical adsorption, so that the adsorption efficiency is greatly improved.

[0033] Preferably, the temperature of the low-temperature flue gas is subzero, for example, -80℃ to -5℃.

[0034] More preferably, the temperature of the low-temperature flue gas is -20℃ to -5℃. The inventors have found through research that the lower the temperature of the flue gas, the more favorable for adsorption purification. However, if the temperature of the flue gas is too low, the structure of the equipment for cooling the flue gas is complex, the energy consumption increases, for example, the cooling equipment, the adsorption tower and the pipeline need to be provided with a heat preservation layer, and the sealing requirement is high, thereby increasing the cost. In addition, under the condition of too low temperature, condensate water is prone to appear in the adsorption tower, which causes the adsorbent to be bonded and blocked, and affects the adsorption. Therefore, it is favorable that the temperature of the flue gas is cooled to -20℃ to -5℃.

[0035] In some embodiments, as shown in Figures 2-4As shown in the longitudinal section of the tower drum 110, the feeding port 112 and the discharging port 113 are arranged on the diagonal of the tower drum 110, so that the upper surface of the adsorption bed 120 formed by the adsorbent stack in the adsorption cavity 111 is inclined, and the inclination direction of the upper surface of the adsorption bed 120 is consistent with the inclination direction of the bottom wall surface 1111 of the adsorption cavity 111, thereby balancing the contact time of the flue gas and the adsorbent, and making the adsorption result of the flue gas more uniform.

[0036] In some embodiments, as shown in Figure 2 and Figure 3 , the discharging port 113 is arranged on the bottom surface of the tower drum 110. Alternatively, as shown in Figure 4 and Figure 5 , the discharging port 113 is arranged on the side wall of the tower drum 110 and adjacent to the bottom surface of the tower drum 110.

[0037] In some embodiments, as shown in Figure 2 and Figure 3 , the feeding port 114 is arranged on the top surface of the tower drum 110, or as shown in Figure 4 or Figure 5 , the feeding port 114 is arranged on the side wall of the tower drum 110 and adjacent to the top surface of the tower drum 110.

[0038] As an example, as shown in Figure 5 , the discharging port 113 is arranged on the side wall of the tower drum 110 and adjacent to the bottom surface of the tower drum 110, and the feeding port 114 is arranged on the side wall of the tower drum 110 and adjacent to the top surface of the tower drum 110, so that in the longitudinal section of the tower drum 110, the feeding port 112 and the discharging port 113 are arranged on the diagonal of the tower drum 110, which can make the movement path of the adsorbent correspond to the inclined flow rule of the flue gas, and make the adsorption result of the flue gas more uniform.

[0039] In some embodiments, as shown in Figure 2 and Figure 4 , the flue gas inlet 114 is located on the lower side of the bottom wall surface 1111 of the adsorption cavity 111, and in the longitudinal section of the tower drum 110, the flue gas outlet 114 and the flue gas inlet 113 are arranged on the diagonal of the tower drum, so that at least part of the low-temperature flue gas entering the adsorption cavity through the flue gas inlet 114 forms a countercurrent with the adsorbent.

[0040] As the adsorbent close to the bottom wall surface 1111 of the adsorption cavity 111 moves along the bottom wall surface 1111 to the direction of the discharge port 113 under the blocking effect of the inclined bottom wall surface 1111, the flue gas inlet 114 is arranged at the lower side of the bottom wall surface 1111, and the low-temperature flue gas entering the adsorption cavity 111 through the flue gas inlet 114 can form a relatively strict countercurrent effect with the moving adsorbent at the position close to the bottom wall surface 1111, that is, the flow direction of the low-temperature flue gas is opposite to the moving direction of the adsorbent. Specifically, as the low-temperature flue gas has an inclined flow rule, a part of the low-temperature flue gas flows upward along the extension direction of the bottom wall surface 1111 after entering the adsorption cavity 1111, and during the flow, the low-temperature flue gas is exactly opposite to the adsorbent moving downward along the extension direction of the bottom wall surface 1111, thereby realizing a better countercurrent relationship. As shown in Figure 2 the low-temperature flue gas flowing upward along the bottom wall surface 1111 continues to flow vertically upward under the limitation of the side wall of the tower drum 110, forms a countercurrent with the adsorbent moving vertically downward in the middle part of the adsorption bed 120, and further balances the amount of flue gas contacted by the adsorbent per unit time, thereby reducing the invalid area in the adsorption bed 120.

[0041] In some embodiments, as shown in Figure 2 and Figure 4 the flue gas inlet 114 is arranged on the side wall of the tower drum 110 and adjacent to the bottom surface of the tower drum 110. Alternatively, in other alternative embodiments, the flue gas inlet 114 can be arranged on the bottom surface of the tower drum 110.

[0042] In some embodiments, as shown in Figure 2 and Figure 4 the flue gas outlet 115 is arranged on the side wall of the tower drum 110 and adjacent to the top surface of the tower drum 110. Alternatively, in other alternative embodiments, the flue gas inlet 114 can be arranged on the top surface of the tower drum 110.

[0043] As an example, as shown in Figure 2 and Figure 4 the flue gas inlet 114 is arranged on the side wall of the tower drum 110 and adjacent to the bottom surface of the tower drum 110, and the flue gas outlet 115 is arranged on the side wall of the tower drum 110 and adjacent to the top surface of the tower drum 110, so that on the longitudinal section of the tower drum 110, the flue gas inlet 114 and the flue gas outlet 113 are arranged on the diagonal opposite sides of the tower drum, which can conform to the inclined flow rule of the flue gas, so that the flow direction of the flue gas is opposite to the flow direction of the adsorbent to form a countercurrent.

[0044] In some embodiments, as shown in Figure 3 and Figure 5As shown, a plurality of first through holes 116 are formed on the bottom wall surface 1111 of the adsorption cavity 111 to form a flue gas inlet 114, and the axial direction of the first through holes 116 is perpendicular to the bottom wall surface 1111 of the adsorption cavity 111, so that at least part of the low-temperature flue gas entering the adsorption cavity 111 through the first through holes 116 forms a cross flow with the adsorbent.

[0045] Since the adsorbent close to the bottom wall surface 1111 of the adsorption cavity 111 moves along the bottom wall surface 1111 to the discharge port 113 under the blocking effect of the inclined bottom wall surface 1111, the flue gas inlet 114 (first through hole 116) is arranged on the bottom wall surface 1111 and perpendicular to the bottom wall surface 1111, and the low-temperature flue gas entering the adsorption cavity 111 through the flue gas inlet 114 can form a more strict cross flow with the moving adsorbent at a position close to the bottom wall surface 1111, that is, the flow direction of the low-temperature flue gas and the moving direction of the adsorbent are perpendicular. Specifically, since the low-temperature flue gas has an inclined flow rule, the low-temperature flue gas entering the adsorption cavity 1111 does not immediately flow vertically upward, but flows upward along a direction having a certain angle with the vertical direction, and during this period, the low-temperature flue gas intersects with the adsorbent moving downward along the extension direction of the bottom wall surface 1111, thereby realizing a better cross flow relationship, balancing the amount of flue gas contacted by the adsorbent per unit time, and reducing the invalid area in the adsorption bed 120.

[0046] In some embodiments, as shown in Figure 3 and Figure 5 The top wall surface 1112 of the adsorption cavity 111 is an inclined surface relative to the horizontal plane, and the inclination direction of the top wall surface 1112 of the adsorption cavity 111 is consistent with the inclination direction of the bottom wall surface 1111, so that the adsorption cavity 111 as a whole presents an inclined structure, making the structure of the adsorption cavity 111 more reasonable.

[0047] Further, as shown in Figure 3 and Figure 5 A plurality of second through holes 117 are formed on the top wall surface of the adsorption cavity 111 to form a flue gas outlet 115, and the axial direction of the second through holes 117 is perpendicular to the top wall surface 1112 of the adsorption cavity 111. The second through holes 117 for discharging clean flue gas are arranged on the inclined top wall surface of the adsorption cavity 111 to conform to the inclined flow direction of the flue gas, so that the flue gas can be smoothly discharged along the second through holes 117, reducing the discharge resistance of the clean flue gas.

[0048] Optionally, the inclination angle of the bottom wall surface 1111 of the adsorption cavity 111 relative to the horizontal plane is 0°-45°.

[0049] If the inclination angle of the bottom wall surface 1111 is too large, for example, greater than 45°, it will result in a higher height of the tower drum 110 under the same amount of adsorbent, which is not conducive to the structural stability of the tower drum 110. In addition, it will also result in a larger unused area below the bottom wall surface 1111, making the space utilization of the adsorption unit 100 too low. Too large inclination angle of the bottom wall surface 1111 will also result in too fast downward movement rate of the adsorbent near the bottom wall surface 1111, affecting the residence time of the adsorbent in the adsorption cavity 111, and further affecting the adsorption effect of the low-temperature flue gas.

[0050] Therefore, making the inclination angle of the bottom wall surface 1111 less than or equal to 45° can make the overall height and space utilization of the adsorption unit 100 within the ideal range under the premise of ensuring the residence time of the adsorbent.

[0051] Preferably, the inclination angle of the bottom wall surface 1111 of the adsorption cavity 111 relative to the horizontal plane is 10°-30°.

[0052] More preferably, the inclination angle of the bottom wall surface 1111 of the adsorption cavity 111 relative to the horizontal plane is 15°-25°.

[0053] In some specific embodiments, the inclination angle of the bottom wall surface 1111 of the adsorption cavity 1111 relative to the horizontal plane is 20°.

[0054] Optionally, the maximum distance between the bottom wall surface 1111 of the adsorption cavity 111 and the top wall surface 1112 of the adsorption cavity 111 in the vertical direction is 1m-3m, and the thickness of the adsorption bed 120 formed by the adsorbent stack in the adsorption cavity 111 in the vertical direction is 0.8m-2.5m. It can be understood that the top wall surface 1112 is located above the adsorption bed 120, and preferably there is a certain interval between the top wall surface 1112 and the top surface of the adsorption bed 120, so that the clean flue gas discharged from the top of the adsorption bed 120 can have a certain buffer in the interval, and then be discharged from the flue gas outlet 115, reducing the discharge pressure of the clean flue gas.

[0055] Making the thickness of the adsorption bed 120 in the vertical direction 0.8m-2.5m can ensure that the adsorption unit 100 has a certain adsorption capacity. Making the maximum distance between the bottom wall surface 1111 of the adsorption cavity 111 and the top wall surface 1112 of the adsorption cavity 111 in the vertical direction 1m-3m can make the top wall surface 1112 and the top surface of the adsorption bed 120 have a certain interval.

[0056] Preferably, the maximum distance between the bottom wall surface 1111 of the adsorption cavity 111 and the top wall surface 1112 of the adsorption cavity 111 in the vertical direction is 2m-3m, and the thickness of the adsorption bed 120 in the vertical direction is 1.5m-2.5m.

[0057] In some specific embodiments, the maximum vertical distance between the bottom wall surface 1111 and the top wall surface 1112 of the adsorption chamber 111 is 2.5m. The vertical thickness of the adsorption bed 120 is 2.0m.

[0058] The following is based on Figures 2-5 Some specific embodiments of the present invention are described below. Figures 2-5 In one embodiment, the adsorption unit 100 includes a tower 110, which has an adsorption cavity 111. The bottom wall surface 1111 and the top wall surface 1112 of the adsorption cavity 111 are both inclined surfaces that are inclined relative to the horizontal plane, and the bottom wall surface 1111 and the top wall surface 1112 have the same inclination angle and inclination direction.

[0059] like Figure 2 As shown, the discharge port 113 is located on the bottom surface of the tower 110, and the feed port 114 is located on the top surface of the tower 110. Thus, in the longitudinal section of the tower 110, the feed port 112 and the discharge port 113 are diagonally opposite each other. The flue gas inlet 114 is located on the side wall of the tower 110 and adjacent to the bottom surface of the tower 110, and the flue gas outlet 115 is located on the side wall of the tower 110 and adjacent to the top surface of the tower 110. Thus, in the longitudinal section of the tower 110, the flue gas outlet 114 and the flue gas inlet 113 are diagonally opposite each other. This arrangement, following the inclined flow pattern of the flue gas, creates a counter-current flow, with the flow direction of the flue gas opposite to the movement direction of the adsorbent.

[0060] like Figure 3 As shown, the discharge port 113 is located on the bottom surface of the tower 110, and the feed port 114 is located on the top surface of the tower 110. Thus, in the longitudinal section of the tower 110, the feed port 112 and the discharge port 113 are diagonally opposite each other. Several first through holes 116 are opened on the bottom wall surface 1111 of the adsorption chamber 111 to form a flue gas inlet 114. The axial direction of the first through holes 116 is orthogonal to the bottom wall surface 1111 of the adsorption chamber 111. Several second through holes 117 are opened on the top wall surface of the adsorption chamber 111 to form a flue gas outlet 115. The axial direction of the second through holes 117 is orthogonal to the top wall surface 1112 of the adsorption chamber 111. The flow direction of the low-temperature flue gas entering the adsorption chamber 111 through the first through holes 116 is orthogonal to the movement direction of the adsorbent, forming a cross-flow.

[0061] like Figure 4 As shown, the discharge port 113 and the flue gas inlet 114 are located on the side wall of the tower 110 and adjacent to the bottom surface of the tower 110, while the feed port 114 and the flue gas outlet 115 are located on the side wall of the tower 110 and adjacent to the top surface of the tower 110. The flow direction of the flue gas is opposite to the movement direction of the adsorbent, forming a countercurrent.

[0062] like Figure 5As shown, the discharge port 113 is arranged on the sidewall of the tower drum 110 and adjacent to the bottom surface of the tower drum 110, the feeding port 114 is arranged on the sidewall of the tower drum 110 and adjacent to the top surface of the tower drum 110, a plurality of first through holes 116 are arranged on the bottom wall surface 1111 of the adsorption cavity 111 to form the flue gas inlet 114, a plurality of second through holes 117 are arranged on the top wall surface of the adsorption cavity 111 to form the flue gas outlet 115, and the flow direction of the low-temperature flue gas entering the adsorption cavity 111 through the first through holes 116 is orthogonal to the moving direction of the adsorbent to form a cross flow.

[0063] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0064] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0065] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0067] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0068] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An adsorption unit in which the adsorbent moves at an angle, characterized in that, It comprises: a tower cylinder with an adsorption cavity inside, the tower cylinder has a feeding port, a discharging port, a flue gas inlet and a flue gas outlet which are in communication with the adsorption cavity, the bottom wall surface of the adsorption cavity is an inclined surface which is inclined to the horizontal plane, the feeding port is located above the bottom wall surface, the discharging port is located at the side of the bottom wall surface which is lower, so that at least part of the adsorbent fed into the adsorption cavity through the feeding port moves along the bottom wall surface of the adsorption cavity to the discharging port and is discharged, the flue gas inlet is located below the flue gas outlet and is in communication with the bottom of the adsorption cavity, so that at least part of the low-temperature flue gas with a temperature below room temperature which enters the adsorption cavity through the flue gas inlet flows towards the flue gas outlet in a direction opposite to the moving direction of the adsorbent to form counterflow, or flows towards the flue gas outlet in a direction orthogonal to the moving direction of the adsorbent to form crossflow, the maximum distance between the bottom wall surface of the adsorption cavity and the top wall surface of the adsorption cavity in the vertical direction is 1m-3m, the thickness of the adsorption bed formed by the adsorbent stack in the adsorption cavity in the vertical direction is 0.8m-2.5m.

2. The adsorption unit with inclined movement of adsorbent according to claim 1, wherein in the longitudinal section of the tower cylinder, the feeding port and the discharging port are correspondingly arranged on the diagonal opposite corners of the tower cylinder, so that the upper surface of the adsorption bed formed by the adsorbent stack in the adsorption cavity is an inclined surface, and the inclination direction of the upper surface of the adsorption bed is consistent with the inclination direction of the bottom wall surface.

3. The adsorption unit with inclined movement of adsorbent according to claim 2, wherein the discharging port is arranged on the side wall of the tower cylinder and adjacent to the bottom surface of the tower cylinder, or is arranged on the bottom surface of the tower cylinder; and / or the feeding port is arranged on the side wall of the tower cylinder and adjacent to the top surface of the tower cylinder, or is arranged on the top surface of the tower cylinder.

4. The adsorption unit with inclined movement of adsorbent according to any one of claims 1-3, wherein the flue gas inlet is located at the side of the bottom wall surface of the adsorption cavity which is lower, and in the longitudinal section of the tower cylinder, the flue gas outlet and the flue gas inlet are correspondingly arranged on the diagonal opposite corners of the tower cylinder, so that at least part of the low-temperature flue gas which enters the adsorption cavity through the flue gas inlet forms counterflow with the adsorbent.

5. The adsorption unit with inclined movement of adsorbent according to claim 4, wherein the flue gas inlet is arranged on the side wall of the tower cylinder and adjacent to the bottom surface of the tower cylinder, or is arranged on the bottom surface of the tower cylinder; and / or the flue gas outlet is arranged on the side wall of the tower cylinder and adjacent to the top surface of the tower cylinder, or is arranged on the top surface of the tower cylinder.

6. The adsorption unit with inclined movement of adsorbent according to any one of claims 1-3, wherein a plurality of first through holes are opened on the bottom wall surface of the adsorption cavity to form the flue gas inlet, the axial direction of the first through hole is orthogonal to the bottom wall surface of the adsorption cavity, so that at least part of the low-temperature flue gas which enters the adsorption cavity through the first through hole forms crossflow with the adsorbent.

7. The adsorption unit of claim 6, wherein the top wall surface of the adsorption cavity is a slope surface inclined relative to a horizontal plane, and the inclination direction of the top wall surface of the adsorption cavity is consistent with the inclination direction of the bottom wall surface.

8. The adsorption unit of claim 7, wherein a plurality of second through holes are formed on the top wall surface of the adsorption cavity to form the flue gas outlet, and the axial direction of the second through holes is perpendicular to the top wall surface of the adsorption cavity. The inclination angle of the bottom wall surface of the adsorption cavity relative to the horizontal plane is 10°-45°. ​ 9. The adsorbent tilting movement adsorption unit according to claim 1, wherein ​

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