Cooling and low-temperature adsorption combined purification device

Abstract

A cooling and low-temperature adsorption combined purification device, comprising a tower body (11), the tower body (11) having a gas intake port (101) and a gas discharge port (102). A gas intake chamber (103), a gas passage chamber (104), and an adsorption chamber (105), which are sequentially distributed in the radial direction of the tower body (11) from inside to outside, are provided in the tower body (11). The gas intake chamber (103) is in communication with the gas intake port (101), a cooling assembly for cooling a flue gas is provided in the gas intake chamber (103), an adsorbent is provided in the adsorption chamber (105) for adsorbing and purifying the cooled flue gas into a clean flue gas in a sub-zero temperature zone, and the gas discharge port (102) is configured to discharge the clean flue gas. The gas passage chamber (104) has a cross-sectional area gradually decreasing in the direction from top to bottom.

Description

Cooling low-temperature adsorption combined purification device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023113646980 filed in China on October 20, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of flue gas purification, and in particular to a cooling and low-temperature adsorption combined purification device. Background Art

[0004] Flue gas from large-scale coal-fired and incineration boilers mostly uses limestone-gypsum wet desulfurization, SCR denitrification and other technologies to remove pollutants. However, in this type of flue gas pollutant removal technology, each pollutant is removed one by one through the corresponding removal equipment (desulfurization tower, denitrification tower, etc.), and each removal equipment is connected in series to form a flue gas purification system, which has a complicated process and high operating costs.

[0005] Related technologies also propose the use of adsorption materials to purify flue gas under high temperature conditions (around 200°C). That is, the high-temperature flue gas discharged from the boiler is sent to a cooling tower to be cooled to around 200°C, and then sent to an adsorption tower, where the adsorbent in the adsorption tower is used for high-temperature adsorption. However, there is a problem of poor pollutant removal effect.

[0006] Summary of the Invention

[0007] The present disclosure is based on the inventors' findings and understanding of the following facts and problems:

[0008] Related technologies have proposed integrated low-temperature flue gas pollutant removal technology. This involves first passing the flue gas through a scrubber for spray cooling, and then transferring the cooled flue gas to a purification tower for adsorption. While this type of pollutant removal technology can achieve the integrated removal of multiple pollutants from flue gas, it still suffers from the high cost and the large amount of equipment required.

[0009] The integrated low-temperature flue gas pollutant removal technology used in related technologies requires at least a scrubber and a purification tower, resulting in significant space and costs. Furthermore, the piping connecting the scrubber and purification towers takes up considerable space, and the process of transporting the flue gas through the pipelines is time-consuming, reducing the overall system's removal efficiency. Ambient temperature also affects the temperature of the flue gas transported within the pipelines, resulting in cooling losses and reduced subsequent adsorption and purification effectiveness. Consequently, the pipelines require additional insulation, further increasing costs.

[0010] The present disclosure aims to address, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present disclosure provide a combined cooling and low-temperature adsorption purification device that achieves both flue gas cooling and low-temperature adsorption within a single tower, thereby saving space, reducing costs, reducing the number of devices, and improving integration.

[0011] The cooling low-temperature adsorption combined purification device of the disclosed embodiment includes a tower body, the tower body having an air inlet and an exhaust port, the tower body is provided with a packing cylinder, an inner shell and an outer shell arranged at intervals from the inside to the outside in the radial direction of the tower body, the tower body has an air inlet cavity, a ventilation cavity and an adsorption cavity arranged in sequence from the inside to the outside in the radial direction of the tower body, the inner cavity of the packing cylinder constitutes the air inlet cavity, the ventilation cavity is located between the packing cylinder and the inner shell, the adsorption cavity is located between the inner shell and the outer shell, the air inlet cavity is communicated with the air inlet, a cooling component is provided in the air inlet cavity, and the cooling component is used to collect the air from the The flue gas to be purified supplied into the air inlet chamber by the air inlet is cooled to low-temperature flue gas below zero degrees. The adsorption chamber is provided with an adsorbent for low-temperature adsorption and purification of the cooled low-temperature flue gas entering the adsorption chamber from the air inlet chamber through the ventilation chamber into clean flue gas. The exhaust port is used to discharge the clean flue gas flowing out of the adsorption chamber. The cross-sectional area of ​​the ventilation chamber gradually decreases from top to bottom. The cavity wall of the air inlet cavity is vertically arranged, and the cavity wall of the ventilation cavity located on the outside and the cavity wall of the adsorption cavity located on the outside are both inverted cones, and the cavity wall of the ventilation cavity located on the outside is parallel to the cavity wall of the adsorption chamber located on the outside.

[0012] The cooling and low-temperature adsorption combined purification device of the embodiment of the present disclosure cools and low-temperature adsorbs the flue gas in a single tower. Compared with related technologies, it reduces the number of towers and the layout of pipelines, improves the integration of the low-temperature adsorption purification process, and thus saves 20%-35% of the floor space of the entire system, avoids the design of insulation structure, and reduces construction costs.

[0013] In the cooling low-temperature adsorption combined purification device of the disclosed embodiment, the flue gas cooled in the cooling chamber inside the tower body directly enters the adsorption chamber, which reduces the transportation distance by at least one washing tower height, saves time, improves the flue gas removal efficiency, and avoids the problem of flue gas cooling capacity loss during pipeline transportation, thereby improving the flue gas purification effect, and eliminates the connecting pipes, valves and elbows between the towers, further saving space and reducing construction costs.

[0014] Moreover, compared with the adsorption chamber in the prior art that extends vertically, the cross-sectional area of ​​the ventilation chamber in the embodiment of the present invention gradually decreases from top to bottom, that is, the adsorption chamber surrounding the ventilation chamber is arranged at an angle, thereby increasing the length of the adsorption chamber, and then increasing the adsorbent filling amount in the adsorption chamber, improving the adsorption efficiency, and in the height direction of the tower body, the adsorption effect is more uniform, fully utilizing the adsorption capacity of the adsorbent, and improving the utilization rate of the adsorbent.

[0015] In some embodiments, in the axial direction and / or radial direction of the tower body, the inlet of the ventilation cavity is away from the air inlet.

[0016] In some embodiments, the air inlet and the air outlet are both adjacent to the bottom of the tower body.

[0017] In some embodiments, the tower body further has an exhaust cavity, which surrounds the adsorption cavity in the radial direction of the tower body and is connected to the exhaust port to discharge the clean flue gas entering the exhaust cavity from the adsorption cavity through the exhaust port.

[0018] In some embodiments, the cross-sectional area of ​​the exhaust cavity gradually increases from top to bottom.

[0019] In some embodiments, the density of the air inlet holes on the inner wall of the adsorption chamber adjacent to the ventilation chamber gradually increases from top to bottom, and the density of the air outlet holes on the outer wall of the adsorption chamber adjacent to the exhaust chamber gradually decreases from top to bottom.

[0020] In some embodiments, a partition is provided in the air inlet cavity to divide the air inlet cavity into a multi-stage spray cavity arranged vertically, and a ventilation component is provided on the partition to allow the flue gas to enter the upper spray cavity from the lower spray cavity. The cooling assembly includes a multi-stage spray component, and the multi-stage spray component is correspondingly arranged in the multi-stage spray cavity. The spray component is used to spray cooling liquid to directly cool the flue gas to be purified in the spray cavity.

[0021] In some embodiments, a filler is provided in the spray chamber, and the spray component is used to spray the coolant from above the filler.

[0022] In some embodiments, the cooling assembly includes a condenser disposed in the air inlet cavity to indirectly cool the flue gas to be purified in the air inlet cavity.

[0023] In some embodiments, the adsorption chamber has an adsorbent inlet at the top and an adsorbent outlet at the bottom, so that the adsorbent is continuously or intermittently supplied into the adsorption chamber from the adsorbent inlet and continuously or intermittently flows out of the adsorption chamber from the adsorbent outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a perspective schematic diagram of the internal structure of a cooling and low-temperature adsorption combined purification device according to an embodiment of the present disclosure.

[0025] FIG2 is a cross-sectional view of a cooling and low-temperature adsorption combined purification device according to an embodiment of the present disclosure.

[0026] FIG3 is a schematic diagram of an adsorbent of a cooling low-temperature adsorption combined purification device according to an embodiment of the present disclosure.

[0027] Reference numerals:

[0028] Tower body 11, air inlet 101, exhaust port 102, air inlet cavity 103, ventilation cavity 104, adsorption cavity 105, adsorption unit 1051, breathable shell 10511, exhaust cavity 106, adsorbent inlet 107, adsorbent outlet 108,

[0029] Spraying parts 21,

[0030] Filling cylinder 31, filler 311,

[0031] Inner shell 411 and outer shell 412. DETAILED DESCRIPTION

[0032] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0033] The cooling and low-temperature adsorption combined purification device according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0034] As shown in FIG1 and FIG2 , the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure includes a tower body 11 having an air inlet 101 and an exhaust port 102 , and an air inlet cavity 103 , a ventilation cavity 104 and an adsorption cavity 105 inside the tower body 11 .

[0035] The air inlet chamber 103 is connected to the air inlet 101 and is equipped with a cooling assembly for cooling the flue gas to be purified, which is supplied from the air inlet 101 to the air inlet chamber 103. For example, this assembly can cool the high-temperature flue gas to be purified from a boiler to a sub-zero temperature. The adsorption chamber 105 contains an adsorbent for low-temperature adsorption and purification of the cooled low-temperature flue gas, which enters the adsorption chamber 105 from the air inlet chamber 103 through the ventilation chamber 104, into clean flue gas. The exhaust port 102 is used to discharge the clean flue gas flowing out of the adsorption chamber 105.

[0036] In some embodiments, the temperature of the low-temperature flue gas is, for example, -80°C to -5°C. In some embodiments, the temperature of the low-temperature flue gas is -20°C to -10°C. The inventors have found through research that the lower the flue gas temperature, the more beneficial it is for adsorption purification. However, if the flue gas temperature is too low, the equipment structure for cooling the flue gas will be complicated and energy consumption will increase. For example, it is required to set up an insulation layer for the cooling equipment, purification tower and pipeline, and the sealing requirements are high, which will lead to increased costs. In addition, too low a temperature condition will easily lead to condensation water in the purification tower, causing the adsorbent to stick and clog, affecting adsorption. Therefore, it is beneficial to cool the flue gas temperature to -20°C to -10°C.

[0037] In an embodiment of the present disclosure, an adsorbent can be filled in a breathable housing 10511 to form an adsorption unit 1051, that is, as shown in FIG3 , the adsorption unit 1051 includes a breathable housing 10511 and an adsorbent filled in the breathable housing 10511. The adsorbent can be a granular or powdered adsorbent, or an adsorbent body made of a powdered or granular adsorbent, such as a spherical body or a cylinder formed by a powdered or granular adsorbent through a binder. Of course, a protective layer can be further provided on the outside of the adsorbent body, such as a breathable film covering the outside of the adsorbent body, to further improve the strength of the adsorbent body. The breathable housing 10511 has air holes, and the flue gas can enter the breathable housing 10511 through the air holes. The flue gas can pass through the gaps between adjacent adsorbents and / or the holes in the adsorbent itself, thereby reducing direct collisions, friction and wear between adsorbents, and the generation of dust. The breathable shell 10511 can be in the shape of a rotating body such as a sphere or a cylinder, wherein the diameter of the adsorption unit 1051 is 10 mm to 100 mm, and the diameter of the adsorbent is 1 mm to 10 mm.

[0038] By placing the adsorbent in the breathable shell 10511 to form the adsorption unit 1051, on the one hand, the dust generated by the collision between the adsorbents can be reduced; on the other hand, it is beneficial to increase the contact area between the flue gas and the adsorbent and improve the air permeability of the adsorbent, which is particularly beneficial for low-temperature adsorption.

[0039] It should be understood that the flue gas supplied into the air inlet 103 through the air inlet 101 is high-temperature flue gas to be purified containing pollutants, and the flue gas discharged from the adsorption chamber 105 and entering the exhaust chamber 106 is clean flue gas with pollutants removed.

[0040] FIG2 shows a longitudinal section of a cooling and low-temperature adsorption combined purification device according to an embodiment of the present disclosure.

[0041] For example, the air inlet 101 of the tower body 11 is connected to the outlet of the flue gas duct of a boiler (e.g., in a power plant or steel mill), allowing the flue gas to be purified to be transported into the tower body 11 for purification. The exhaust port 102 of the tower body 11 can be connected to a chimney to discharge the clean flue gas that meets the standards directly into the atmosphere through the chimney, thereby achieving near-zero emissions. The exhaust port 102 of the tower body 11 can also be connected to a cold recovery device (such as a cold recovery tower) to further utilize the cold energy in the clean flue gas, reducing energy consumption and costs.

[0042] The flue gas to be purified enters the air inlet chamber 103 through the air inlet 101, and the flue gas in the air inlet chamber 103 is cooled to low-temperature flue gas in the sub-zero temperature zone, for example, low-temperature flue gas of -20°C to -15°C, by the cooling component. The ventilation chamber 104 is located between the air inlet chamber 103 and the adsorption chamber 105, so that the cooled low-temperature flue gas enters the ventilation chamber 104 from the air inlet chamber 103 through the inlet of the ventilation chamber 104 and then enters the adsorption chamber 105 from the ventilation chamber 104. The adsorbent in the adsorption chamber 105 removes pollutants in the flue gas to purify it into clean flue gas, and the clean flue gas is discharged from the tower body 11 through the exhaust port 102.

[0043] It is understandable that since the flue gas transported from the boiler to the air inlet chamber 103 has a high flow rate, the flue gas slows down to a certain extent during the cooling process in the air inlet chamber 103, but the flow rate of the flue gas after cooling may still be large. If it directly enters the adsorption chamber 105, it will not only impact the adsorbent and cause damage to the adsorbent, but also the adsorption time of the flue gas in the adsorption chamber 105 is short. Since low-temperature adsorption requires the flue gas to maintain contact with the adsorbent for a certain period of time, otherwise it will easily lead to poor pollutant removal effect.

[0044] In the embodiment of the present disclosure, a ventilation chamber 104 is provided between the air inlet chamber 103 and the adsorption chamber 105 so that the low-temperature flue gas cooled in the air inlet chamber 103 first enters the ventilation chamber 104 for buffering, slowing down the flow rate of the flue gas, and then flows into the adsorption chamber 105 for low-temperature adsorption purification, thereby improving the removal effect of pollutants in the flue gas and achieving near-zero emissions.

[0045] Therefore, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure integrates the cooling and adsorption processes of the flue gas in one tower. Compared with the method of first cooling through a washing tower and then adsorbing through a purification tower in the related art, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure reduces the floor space by 20%-35% and reduces the construction cost.

[0046] Compared with the related art in which the washing tower and the purification tower are connected by pipelines and the flue gas is transported to the purification tower by pipelines, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure reduces the transportation distance by at least the height of a washing tower, saves time, improves the flue gas removal efficiency, and avoids the problem of flue gas cooling loss during pipeline transportation, thereby improving the flue gas removal effect.

[0047] Moreover, compared with the related art in which the pipeline is connected to the tower through an elbow, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure also eliminates the arrangement of pipelines and elbows, further saving space and reducing costs.

[0048] In some embodiments, the air inlet cavity 103, the ventilation cavity 104, and the adsorption cavity 105 in the tower body 11 can be arranged in various ways. For example, the air inlet cavity 103, the ventilation cavity 104, and the adsorption cavity 105 can be arranged in sequence horizontally, or in sequence vertically.

[0049] For example, as shown in Figures 1 and 2, in the radial direction of the tower body 11, the adsorption chamber 105 surrounds the ventilation chamber 104, and the ventilation chamber 104 surrounds the air inlet chamber 103. In other words, in the radial direction of the tower body 11, from inside to outside, there are the air inlet chamber 103, the ventilation chamber 104, and the adsorption chamber 105.

[0050] In contrast, conventional scrubbers require insulation measures. Without insulation measures designed for the walls of the scrubber, cooling losses occur. However, designing insulation measures increases costs. Therefore, the cooling low-temperature adsorption combined purification device of the disclosed embodiment locates the air inlet chamber 103 in the middle of the tower body 11, and the adsorption chamber 105 surrounds the air inlet chamber 103. The adsorption chamber 105 insulates the air inlet chamber 103, preventing the cooling energy of the air inlet chamber 103 from being lost to the outside environment.

[0051] In summary, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure not only avoids the loss of cold during the pipeline transportation of flue gas, but also avoids the loss of cold in the air inlet chamber 103. Compared with the relevant technology, the cooling low-temperature adsorption combined purification device of the embodiment of the present disclosure avoids at least 5%-20% of the loss of cold.

[0052] In some embodiments, as shown in Figures 1 and 2, the cross-sectional area of ​​the ventilation cavity 104 gradually decreases from top to bottom. For example, as shown in Figure 1, the cavity wall of the air inlet cavity 103 is vertically arranged, the cavity wall of the ventilation cavity 104 located on the outside is in an inverted cone shape, and the cavity wall of the adsorption cavity 105 located on the outside is also inverted cone shape and is parallel to the cavity wall of the ventilation cavity 104 located on the outside. That is, the cavity wall of the ventilation cavity 104 and the cavity wall of the adsorption cavity 105 located on the outside are both arranged at an angle.

[0053] Therefore, the upper space of the ventilation cavity 104 is large, and the amount of flue gas contained is large. The corresponding adsorbent has a strong adsorption capacity at this time. The ventilation cavity 104 gradually decreases downward, and the amount of flue gas contained is small. The corresponding adsorbent has already adsorbed the pollutants in the flue gas and its adsorption capacity is weakened. Therefore, the adsorbent adsorbs evenly, improves the adsorption efficiency, fully utilizes the adsorption capacity of the adsorbent, and improves the purification effect.

[0054] In some embodiments, the inclination angle of the adsorption chamber 105 is 5° to 10° to avoid the problem of poor adsorbent circulation in the adsorption chamber 105 caused by a too large inclination angle, and the adsorption advantage brought by the gradual change of the cross-section of the ventilation chamber cannot be brought into play if the angle is too small.

[0055] It can be understood that the upper and lower ends of the ventilation chamber 104 and the adsorption chamber 105 can be flush with the upper and lower ends of the air inlet chamber 103. Compared with the vertical arrangement of the outer cavity wall of the ventilation chamber 104 and the outer cavity wall of the adsorption chamber 105, tilting the two can increase the length of the adsorption chamber 105, thereby increasing the adsorbent filling amount and improving the adsorption efficiency.

[0056] In some embodiments, as shown in Figures 1 and 2, the air inlet 101 is located at the bottom of the tower body 11, and the entrance of the ventilation cavity 104 is away from the air inlet 101, so that the flue gas entering the air inlet cavity 103 can be fully cooled in the air inlet cavity 103, avoiding flowing into the ventilation cavity 104 just after entering the air inlet cavity 103 before being fully cooled to a low temperature.

[0057] In some embodiments, as shown in Figures 1 and 2, the air inlet 101 is connected to the lower part of the air inlet cavity 103, and the inlet of the ventilation cavity 104 is connected to the upper part of the air inlet cavity 103. The flue gas to be purified enters the air inlet cavity 103 through the air inlet 101, and the flue gas flows from bottom to top to the ventilation cavity 104.

[0058] In some embodiments, as shown in FIG. 1 and FIG. 2 , the exhaust port 102 is located at the bottom of the tower body 11 .

[0059] It can be understood that the cooled low-temperature flue gas flows from top to bottom in the ventilation chamber 104, and flows into the adsorption chamber 105 in a direction perpendicular to the cavity wall of the adsorption chamber 105. Through the adsorption action of the adsorbent, various pollutants such as SO2, NOx, dust and mercury in the cooled flue gas are removed to generate clean flue gas. The clean flue gas flows downward to the exhaust port 102 and is discharged outside the tower.

[0060] In some embodiments, as shown in Figures 1 and 2 , the tower body 11 further includes an exhaust chamber 106. The exhaust chamber 106 surrounds the adsorption chamber 105 and is in communication with the exhaust port 102, so that the clean flue gas entering the exhaust chamber 106 from the adsorption chamber 105 can be discharged through the exhaust port 102. In other words, the exhaust chamber 106 is used to collect the clean flue gas flowing out of the adsorption chamber 105 to the exhaust port 102.

[0061] In some embodiments, as shown in Figures 1 and 2 , the cross-sectional area of ​​the exhaust chamber 106 gradually increases from top to bottom. That is, the flow area of ​​the exhaust chamber 106 gradually increases from top to bottom, thereby facilitating the downward flow of flue gas to the exhaust port 102 and improving the uniformity of adsorbent utilization within the adsorption chamber 105.

[0062] In some embodiments, as shown in Figures 1 and 2 , a baffle (not shown) is provided within the air inlet cavity 103 to divide the air inlet cavity 103 into a plurality of vertically arranged spray cavities. A ventilation component (lift cap) is provided on the baffle to allow flue gas to enter the upper spray cavity from the lower spray cavity. The cooling assembly includes a multi-stage spray component 21, which is correspondingly disposed within the multi-stage spray cavity. The spray component 21 is used to spray coolant to directly cool the flue gas to be purified within the spray cavity. A packing 311 is provided within the spray cavity, and the spray component 21 is used to spray coolant from above the packing 311.

[0063] In some embodiments, there are multiple partitions, each provided with a liquid collecting trough. The partitions are sequentially defined as a first partition and a second partition from bottom to top, thereby dividing the air inlet cavity 103 into three layers of spray cavities from bottom to top. The multi-stage spray component 21 is sequentially defined as a first-stage spray component, a second-stage spray component, and a third-stage spray component from bottom to top. The multi-stage filler 311 is sequentially defined as a first-stage filler, a second-stage filler, and a third-stage filler from bottom to top.

[0064] Among them, the first partition is used to collect the coolant sprayed by the second-stage spray component, and the ventilation component on the first partition is used to prevent the coolant sprayed by the second-stage spray component from entering the first-layer spray chamber, and also allows the flue gas cooled by the first-stage spray component to enter the second-layer spray chamber.

[0065] Similarly, the second partition is used to collect the coolant sprayed by the third-stage spray component. The ventilation component on the second partition is used to prevent the coolant sprayed by the third-stage spray component from entering the second-layer spray chamber, and also allows the flue gas cooled by the second-stage spray component to enter the third-layer spray chamber.

[0066] It is understood that after the flue gas enters the air inlet chamber 103, it passes through the three layers of spray chambers in sequence for a step-by-step cooling process. In the first-stage packing, the flue gas exchanges heat with the coolant (normal-temperature spray cooling water) sprayed by the first-stage spray component, reducing its temperature to near room temperature. In the second-stage packing, the flue gas exchanges heat with the coolant (chilled water) sprayed by the second-stage spray component, reducing its temperature to approximately 5°C. In the third-stage packing, the flue gas exchanges heat with the coolant (low-temperature refrigerant) sprayed by the third-stage spray component, reducing its temperature to the set temperature in the sub-zero temperature range.

[0067] The cooling capacity of the cooling liquid sprayed by the first-stage spray component can be obtained through a cooling tower, and the cooling capacity of the cooling liquid sprayed by the second-stage spray component and the cooling capacity of the cooling liquid sprayed by the third-stage spray component can be obtained through a refrigeration system.

[0068] Thus, after three-stage cooling, the flue gas temperature drops to the sub-zero temperature zone. The cooled flue gas enters the adsorption chamber 105 through the ventilation chamber 104, and is adsorbed by the adsorbent to remove various pollutants such as SO2, NOx, dust and mercury from the flue gas.

[0069] It should be understood that in the low-temperature environment of the sub-zero temperature zone, the nitrogen oxides in the flue gas undergo low-temperature oxidation and adsorption on the surface of adsorbents such as activated carbon, oxidizing the difficult-to-adsorb nitric oxide gas into easily adsorbed nitrogen dioxide gas, achieving a hundreds-fold increase in adsorption capacity. In addition, the adsorption capacity of components such as sulfur dioxide, carbon dioxide and heavy metals also increases exponentially in low-temperature environments.

[0070] In other embodiments, the cooling assembly includes a condenser disposed in the air inlet cavity 103 to indirectly cool the flue gas to be purified in the air inlet cavity 103 .

[0071] In some embodiments, the condenser is an S-shaped, spiral or vortex-shaped heat exchange tube disposed in the air inlet cavity 103 , and a cooling medium is passed through the heat exchange tube so that the flue gas contacts the heat exchange tube for indirect cooling.

[0072] In some embodiments, as shown in FIG. 1 and FIG. 2 , the tower body 11 is a vertical container, that is, the height of the tower body 11 is much greater than the diameter of the tower body 11 .

[0073] The tower body 11 is provided with an inner shell 411 and an outer shell 412. The inner shell 411 has an inner cavity constituting an air inlet cavity 103, an adsorption cavity 105 is formed between the inner shell 411 and the outer shell 412, and an exhaust cavity 106 is formed between the outer shell 412 and the inner wall of the tower body 11.

[0074] A stuffing tube 31 is provided in the inner cavity of the inner shell 411, and a stuffing 311 is provided in the stuffing tube 31. The inner cavity of the stuffing tube 31 constitutes an air inlet cavity 103, and a ventilation cavity 104 is formed between the outer wall of the stuffing tube 31 and the wall of the inner cavity of the inner shell 411, so that the cooled low-temperature flue gas enters the adsorption cavity 105 through the ventilation cavity 104.

[0075] The air inlet 101 is connected to the lower part of the inner cavity of the packing tube 31. The flue gas to be purified enters the inner cavity of the packing tube 31 (the air inlet cavity 103) through the air inlet 101, and the flue gas flows from bottom to top. The cooling component is arranged in the packing tube 31 to cool the flue gas in the inner cavity of the packing tube 31. The cooled flue gas enters the ventilation cavity 104 from the upper end of the packing tube 31. The cooled flue gas flows from top to bottom in the ventilation cavity 104 and flows into the adsorption cavity 105 in a direction perpendicular to the inner shell 411. Under the adsorption action of the adsorbent, various pollutants such as SO2, NOx, dust and mercury are removed from the cooled flue gas to generate clean flue gas. The clean flue gas flows into the exhaust cavity 106, flows from top to bottom in the exhaust cavity 106 to the exhaust port 102 and is discharged outside the tower.

[0076] In some embodiments, the inner shell 411 is provided with a first vent for the cooled low-temperature flue gas to pass through, and the outer shell 412 is provided with a second vent for the clean flue gas to pass through. The size of the first vent and the second vent are both smaller than the size of the adsorbent in the adsorption chamber 105 to prevent the adsorbent from flowing out through the first and second vents. For example, the vent is a hole or a wire mesh.

[0077] In some embodiments, the first ventilation portion is composed of a plurality of air inlet holes, and the density of the air inlet holes on the inner wall (inner shell 411) of the adsorption chamber 105 adjacent to the ventilation chamber 104 gradually increases from top to bottom. If the air inlet holes on the inner shell 411 are evenly distributed from top to bottom, most of the flue gas flowing from the air inlet chamber 103 into the ventilation chamber 104 directly enters the adsorption chamber 105 through the air inlet holes at the top of the ventilation chamber 104, and a small amount of flue gas enters the adsorption chamber 105 through the air inlet holes at the bottom of the ventilation chamber 104, resulting in uneven use of the adsorbent in the adsorption chamber 105 and reduced adsorbent utilization. Therefore, the number of air inlet holes opened in the upper part of the ventilation chamber 104 is smaller than the number of air inlet holes opened in the lower part of the ventilation chamber 104, so as to limit the amount of smoke passing through the upper part of the ventilation chamber 104, so that the flue gas flows downward and passes through the air inlet holes at the bottom of the ventilation chamber 104, thereby improving the utilization rate of the adsorbent.

[0078] The second ventilation portion is composed of a plurality of air outlet holes, and the density of the air outlet holes on the outer wall (shell 412) of the adsorption chamber 105 adjacent to the exhaust chamber 106 gradually decreases from top to bottom, so as to increase the adsorption time of the flue gas in the adsorption chamber 105 and improve the adsorption effect.

[0079] In some embodiments, as shown in FIG2 , the adsorption chamber 105 has an adsorbent inlet 107 at its top and an adsorbent outlet 108 at its bottom, so that the adsorbent is continuously or intermittently supplied into the adsorption chamber 105 from the adsorbent inlet 107 and continuously or intermittently flows out of the adsorption chamber 105 from the adsorbent outlet 108 .

[0080] In some embodiments, the adsorbent inlet 107 and the adsorbent outlet 108 are both provided with control valves to control the on-off of the adsorbent inlet 107 and the adsorbent outlet 108, thereby determining whether the adsorbent in the adsorption chamber 105 flows continuously or intermittently according to actual working conditions, that is, the adsorbent forms a continuous or intermittent moving adsorbent bed in the adsorption chamber 105.

[0081] When the adsorbent flows continuously, the control valves of the adsorbent inlet 107 and the adsorbent outlet 108 are in an open state, and the adsorbent is continuously supplied into the adsorption chamber 105 from the adsorbent inlet 107 and continuously discharged from the adsorption chamber 105 from the adsorbent outlet 108 .

[0082] During intermittent adsorbent flow, the control valve of the adsorbent inlet 107 is open, and the control valve of the adsorbent outlet 108 is closed. The adsorbent enters the adsorption chamber 105 from the adsorbent inlet 107 and moves downward along the wall of the adsorption chamber 105. After filling the adsorption chamber 105, the control valve of the adsorbent inlet 107 is closed. After the adsorbent is saturated, the control valve of the adsorbent outlet 108 is opened, and the adsorbent is discharged from the adsorption chamber 105 through the adsorbent outlet 108.

[0083] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0084] 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 being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0085] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0086] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0087] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0088] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present disclosure.

Claims

1. A cooling low-temperature adsorption combined purification device, characterized in that: The tower body comprises a tower body, the tower body has an air inlet and an air outlet, the tower body is provided with a packing cylinder, an inner shell and an outer shell which are arranged at intervals from the inside to the outside in the radial direction of the tower body, the tower body has an air inlet cavity, a ventilation cavity and an adsorption cavity which are arranged in sequence from the inside to the outside in the radial direction of the tower body, the inner cavity of the packing cylinder constitutes the air inlet cavity, the ventilation cavity is located between the packing cylinder and the inner shell, the adsorption cavity is located between the inner shell and the outer shell, the air inlet cavity is communicated with the air inlet, a cooling component is provided in the air inlet cavity, and the cooling component is used to supply air from the air inlet to the air inlet. The flue gas to be purified in the air cavity is cooled to low-temperature flue gas below zero degrees. The adsorption cavity is provided with an adsorbent, which is used to low-temperature adsorb and purify the cooled low-temperature flue gas that enters the adsorption cavity from the air inlet cavity through the ventilation cavity into clean flue gas. The exhaust port is used to discharge the clean flue gas flowing out of the adsorption cavity. The cross-sectional area of ​​the ventilation cavity gradually decreases from top to bottom. The cavity wall of the air inlet cavity is vertically arranged, and the cavity wall of the ventilation cavity located on the outside and the cavity wall of the adsorption cavity located on the outside are both inverted cones, and the cavity wall of the ventilation cavity located on the outside is parallel to the cavity wall of the adsorption cavity located on the outside.

2. The cooling low-temperature adsorption combined purification device according to claim 1 is characterized in that: In the axial direction and / or radial direction of the tower body, the inlet of the ventilation cavity is far away from the air inlet.

3. The cooling low-temperature adsorption combined purification device according to claim 1 or 2, characterized in that: The air inlet and the air outlet are both adjacent to the bottom of the tower body.

4. The cooling low-temperature adsorption combined purification device according to any one of claims 1 to 3, characterized in that: The tower body is further provided with an exhaust cavity, which surrounds the adsorption cavity in the radial direction of the tower body and is communicated with the exhaust port so as to discharge clean flue gas entering the exhaust cavity from the adsorption cavity through the exhaust port.

5. The cooling low-temperature adsorption combined purification device according to claim 4, characterized in that: The cross-sectional area of ​​the exhaust cavity gradually increases from top to bottom.

6. The cooling low-temperature adsorption combined purification device according to claim 4 is characterized in that: The density of the air inlet holes on the inner wall of the adsorption chamber adjacent to the ventilation chamber gradually increases from top to bottom, and the density of the air outlet holes on the outer wall of the adsorption chamber adjacent to the exhaust chamber gradually decreases from top to bottom.

7. The cooling low-temperature adsorption combined purification device according to any one of claims 1 to 6, characterized in that: A partition is provided in the air intake cavity to divide the air intake cavity into a multi-stage spray cavity arranged vertically. A ventilation component is provided on the partition to allow smoke to enter the upper-stage spray cavity from the lower-stage spray cavity. The cooling assembly includes a multi-stage spray component, and the multi-stage spray components are correspondingly arranged in the multi-stage spray cavity. The spray component is used to spray coolant to directly cool the smoke to be purified in the spray cavity.

8. The cooling low-temperature adsorption combined purification device according to claim 7 is characterized in that: A filler is arranged in the spray chamber, and the spray component is used for spraying cooling liquid from above the filler.

9. The cooling low-temperature adsorption combined purification device according to any one of claims 1 to 6, characterized in that: The cooling assembly comprises a condenser arranged in the air inlet cavity to indirectly cool the flue gas to be purified in the air inlet cavity.

10. The cooling low-temperature adsorption combined purification device according to any one of claims 1 to 9, characterized in that: The adsorption chamber has an adsorbent inlet at the top and an adsorbent outlet at the bottom, so that the adsorbent is continuously or intermittently supplied into the adsorption chamber from the adsorbent inlet and continuously or intermittently flows out of the adsorption chamber from the adsorbent outlet.

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