Parallel low-temperature flue gas cross-flow purification equipment and low-temperature flue gas treatment system

Abstract

The application discloses a parallel low-temperature flue gas cross-flow purification equipment and a low-temperature flue gas treatment system. The parallel low-temperature flue gas cross-flow purification equipment comprises an adsorption tower body and a plurality of adsorbent cylinders. Each adsorbent cylinder comprises an inner cylinder and an outer cylinder. The adsorbent cavity is used for containing adsorbent to form an adsorbent layer. The plurality of adsorbent cylinders are nested in the adsorption tower body. The gas chamber and the adsorbent cylinder segments are arranged alternately in the flue gas flow direction in the adsorption tower body. A plurality of corresponding adsorbent cylinder segments in the radial direction of the adsorbent cylinder constitute an adsorbent cylinder segment layer. Flue gas sequentially passes through a plurality of adsorbent cylinder segments in an upstream adsorbent cylinder segment layer in one of the inner-outer direction and the outer-inner direction, and then sequentially passes through a plurality of adsorbent cylinder segments in a downstream adsorbent cylinder segment layer in the other of the inner-outer direction and the outer-inner direction. Therefore, the parallel low-temperature flue gas cross-flow purification equipment has the advantages of high manufacturing convenience and high purification efficiency.

Description

Technical Field

[0001] This invention relates to the field of adsorption and purification technology, specifically to a parallel low-temperature flue gas cross-flow purification device and a low-temperature flue gas treatment system. Background Technology

[0002] Industrial flue gas refers to the general term for various pollutant-containing flue gases emitted into the air during fuel combustion and production processes within a factory premises. In related technologies, the common method for removing pollutants from flue gas is to pass it through purification equipment filled with adsorbents. Common flue gas purification equipment includes counter-current flue gas purification equipment and cross-current flue gas purification equipment. Cross-current flue gas purification equipment is widely used in the field of flue gas adsorption purification technology due to its advantages such as good adsorption effect and uniform adsorption. Traditional flue gas adsorption technology is usually high-temperature adsorption technology, where high-temperature flue gas is cooled to approximately 200°C through a cooling tower before being fed into the flue gas purification equipment for high-temperature adsorption purification. However, adsorption at high temperatures suffers from problems such as high adsorbent consumption and poor adsorption effect, making it impossible to achieve near-zero emissions of 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 in high-temperature flue gas adsorption, a low-temperature flue gas adsorption technology has been proposed. This involves cooling the flue gas to below room temperature and then removing pollutants from the cooled flue gas through adsorption. In low-temperature flue gas adsorption, the adsorption capacity of the adsorbent is increased exponentially at low temperatures, significantly improving the adsorption and purification rate compared to conventional high-temperature flue gas adsorption, and achieving near-zero emissions. However, the inventors discovered through research that, compared to conventional high-temperature adsorption, the diffusion rate of low-temperature flue gas is lower in the low-temperature adsorption process. This significantly increases the residence time of the low-temperature flue gas in the flue gas purification equipment, resulting in a longer purification time and consequently affecting the purification efficiency.

[0005] In related technologies, cross-flow purification devices have been proposed for flue gas adsorption and purification. However, the inventors have discovered that in these devices, the direction in which the flue gas passes through the adsorption bed is generally orthogonal to the flow direction of the adsorbent. This results in a significant amount of underutilized space within the purification device, leading to wasted space. To ensure effective flue gas purification, the thickness of the linear bed is increased. However, a thicker adsorbent bed can lead to a situation where the upstream side of the bed is saturated while the downstream side is not. This uneven saturation results in the discharge of adsorbent, wasting adsorbent and increasing its usage cost.

[0006] Furthermore, an excessively thick bed will further increase the flow resistance of flue gas, affecting the purification efficiency of the purification equipment. To achieve higher flue gas purification efficiency, it is necessary to increase the volume of the linear bed. However, this requires increasing the volume of the low-temperature cross-flow purification equipment, thereby increasing the cost and floor space of the purification equipment.

[0007] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a parallel low-temperature flue gas cross-flow purification device, which has the advantages of being easy to manufacture and improving the purification efficiency of low-temperature flue gas.

[0008] The present invention also proposes a low-temperature flue gas treatment system.

[0009] The parallel low-temperature flue gas cross-flow purification device of the present invention includes an adsorption tower body, multiple adsorbent layers, and multiple adsorbent cylinders. The adsorption tower body is provided with a flue gas inlet for supplying low-temperature flue gas below room temperature into the adsorption tower body and a flue gas outlet for discharging clean low-temperature flue gas. Each adsorbent cylinder includes an inner cylinder and an outer cylinder, and the space between the inner cylinder and the outer cylinder forms an adsorbent cavity for accommodating the adsorbent layer. Multiple adsorbent cylinders are nested within the adsorption tower body, with adjacent adsorbent cylinders spaced apart from each other. The adsorbent cylinder is divided into multiple adsorbent cylinder segments along the axial direction of the adsorbent cylinder. The annular space between the outermost adsorbent cylinder and the adsorption tower body, and the space between adjacent adsorbent cylinders are also included. The annular space and the inner cavity of the innermost adsorbent cylinder are respectively equipped with smoke baffles to isolate multiple gas chambers. The gas chambers and adsorbent cylinder segments are arranged alternately in the flow direction of the low-temperature flue gas in the adsorption tower. Multiple adsorbent cylinder segments corresponding to each other in the radial direction of the adsorbent cylinder form an adsorbent cylinder segment layer. Adjacent adsorbent cylinder segment layers include upstream adsorbent cylinder segment layers and downstream adsorbent cylinder segment layers. The low-temperature flue gas passes through multiple adsorbent cylinder segments in the upstream adsorbent cylinder segment layer in sequence along one of the inward and outward directions and the outward and inward directions, and then passes through multiple adsorbent cylinder segments in the downstream adsorbent cylinder segment layer in sequence along the other of the inward and outward directions and the outward and inward directions.

[0010] The parallel low-temperature flue gas cross-flow purification device of this invention arranges multiple adsorbent cylinders in a nested manner within the adsorption tower. This means that the low-temperature flue gas passes radially through multiple layers of adsorbent cylinders, sequentially contacting the adsorbent layers within each layer for adsorption purification. While ensuring the purification effect, the thickness of the adsorbent layer in each cylinder is reduced, thereby decreasing the resistance to the low-temperature flue gas passing through the layers and increasing its flow and diffusion rates. This overcomes the problem of high resistance caused by directly allowing the low-temperature flue gas to pass through a thicker adsorbent layer, thus improving the purification efficiency. Furthermore, the reduced thickness of the adsorbent layer in each cylinder and the decreased flow resistance of the low-temperature flue gas facilitate uniform contact between the low-temperature flue gas and the adsorbent layer, further improving the contact effect. This is particularly beneficial for the adsorption of low-temperature flue gas, increasing the adsorbent utilization rate, effectively avoiding uneven adsorbent saturation, preventing adsorbent waste, and reducing adsorbent usage costs. Furthermore, reducing the flow resistance of the low-temperature flue gas can lower the pressure in each chamber, thus reducing the requirements for the airtightness of the chambers within the adsorption tower. Therefore, this parallel low-temperature flue gas cross-flow purification equipment has the advantages of being easy to process and manufacture.

[0011] Meanwhile, the parallel low-temperature flue gas cross-flow purification device of the present invention achieves multi-stage purification of low-temperature flue gas by alternately arranging multi-stage gas chambers and multi-stage adsorbent cylinders along the flow direction of low-temperature flue gas within the purification device. Because the purified flue gas undergoes multiple, multi-stage cross-flow low-temperature adsorption purification processes, the adsorbent purification of the flue gas is more thorough, thereby achieving near-zero emissions of the flue gas.

[0012] Furthermore, due to the hollow structure of the adsorbent cylinders, multiple adsorbent cylinders are nested within the adsorption tower, resulting in a relatively compact structure. This fully utilizes the internal space of the adsorption tower for adsorbent filling, improving space utilization. Compared to the linear bed structure in related technologies, with the same total adsorbent filling volume within the adsorption tower, the parallel low-temperature flue gas cross-flow purification device provided by this invention reduces volume and floor space by at least 20%, saving on construction costs. Additionally, compared to the linear cross-flow purification device in related technologies, with the same floor space, the parallel low-temperature flue gas cross-flow purification device provided by this invention can more fully utilize the internal space of the adsorption tower for adsorbent filling while ensuring smooth flue gas flow, reducing ineffective areas within the adsorption tower and increasing the adsorbent filling volume by approximately 30% or more. This increased adsorbent filling volume further increases the total contact area between the low-temperature flue gas and the adsorbent, significantly improving the adsorption capacity of the low-temperature flue gas cross-flow purification device per unit time. For example, it can increase by approximately 30% or more, improving the flue gas purification efficiency of the purification equipment.

[0013] In summary, the parallel low-temperature flue gas cross-flow purification equipment of the present invention has the characteristics of high space utilization, low cost and high purification efficiency.

[0014] Optionally, the inner and outer walls of the adsorbent cylinder section are provided with ventilation channels, and a transition cylinder section is provided between adjacent adsorbent cylinder sections of the same adsorbent cylinder. The transition cylinder section has a reduced diameter, and its inner and outer walls are gas-blocking walls. Furthermore, the gas-blocking walls effectively prevent low-temperature flue gas from entering adjacent adsorbent cylinder sections and adjacent gas chambers through this area, reducing the cross-flow of low-temperature flue gas within adjacent adsorbent cylinder sections and between adjacent gas chambers. Therefore, the parallel low-temperature flue gas cross-flow purification device of the present invention further improves the purification effect of low-temperature flue gas.

[0015] Optionally, the reduced diameter section has a return port, and the smoke-separating plate is inclined relative to the horizontal direction. The smoke-separating plate has an inner end and an outer end along the inner and outer directions of the adsorption tower body. The lower end of the inner end and the outer end is connected to the lower wall of the return port so that the adsorbent falling on the smoke-separating plate is introduced into the adsorbent chamber. This prevents the flue gas from passing through the adsorbent chamber in the transition section, and prevents the low-temperature flue gas from directly flowing into adjacent gas chambers through the adsorbent chamber. Therefore, this parallel low-temperature flue gas cross-flow purification device can further improve the purification effect of low-temperature flue gas.

[0016] Optionally, in adjacent adsorbent sections of the same adsorbent cartridge, the volume of the adsorbent cavity in the upstream adsorbent section is larger than that in the downstream adsorbent section. This is because the concentration of the substance to be adsorbed in the low-temperature flue gas flowing through the upstream cartridge is much higher than that in the downstream cartridge. By making the volume of the adsorbent cavity in the upstream cartridge larger than that in the downstream cartridge, the adsorption capacity of the adsorbent layer can be matched to the concentration of the upstream low-temperature flue gas. Therefore, this low-temperature flue gas cross-flow purification equipment has the advantage of reducing the total amount of adsorbent used and the cost of adsorbent use (it can reduce the total amount of adsorbent used by 10% to 17%).

[0017] Optionally, the length of the adsorbent cavity in the upstream adsorbent section is 'a', and the length of the adsorbent cavity in the downstream adsorbent section is 'b', where 'a' is greater than 'b'. Similarly, this low-temperature flue gas cross-flow purification device can reduce the total amount of adsorbent used.

[0018] Optionally, an inlet pipe is provided in the inner cavity of the innermost adsorbent cylinder, with its lower end extending downwards into the upstream air chamber in the flow direction of the low-temperature flue gas. Because the low-temperature flue gas will overflow upwards in the inner cylinder of the adsorbent cylinder due to air pressure, the parallel low-temperature flue gas cross-flow purification device of the present invention, by extending the lower end of the inlet pipe downwards into the upstream air chamber located at the bottom of the inner cavity, can increase the flow time of the low-temperature flue gas around the adsorption tower and the contact area with the adsorbent. This further enhances the purification effect.

[0019] Optionally, a smoke-separating plate is provided in the inner cavity of the innermost adsorbent cylinder to divide the inner cavity of the innermost adsorbent cylinder into two gas chambers. A smoke-separating plate is provided in the annular space between the outermost adsorbent cylinder and the adsorption tower body to divide the annular space between the outermost adsorbent cylinder and the adsorption tower body into two gas chambers. Two smoke-separating plates are provided in the annular space between adjacent adsorbent cylinders to divide the annular space between adjacent adsorbent cylinders into three gas chambers. This invention, by providing a smoke-separating plate in the inner cavity of the innermost adsorbent cylinder and a smoke-separating plate in the annular space between the outermost adsorbent cylinder and the adsorption tower body, has a simple overall structure and therefore has the advantages of being easy to modify and process.

[0020] Optionally, each adsorbent cartridge is divided into three adsorbent segments. These segments form an upstream, midstream, and downstream adsorbent segment layer arranged along the flow direction of the low-temperature flue gas. The low-temperature flue gas passes sequentially from the upstream chamber through the upstream adsorbent segment layer in an inward-outward direction, then through the midstream adsorbent segment layer in an outward-inward direction, and finally through the downstream adsorbent segment layer in an outward-inward direction. Therefore, by using only three adsorbent segments, the structure is relatively divided into multiple sections, offering advantages in terms of ease of modification and processing.

[0021] Optionally, the adsorption tower is equipped with a flue gas dispersion plate, which is located near the lower end of the upstream adsorbent cylinder section. The flue gas dispersion plate has an upwardly convex conical surface. By using the upwardly convex conical surface of the flue gas dispersion plate, when the low-temperature flue gas is discharged from the inlet pipe, the discharged flue gas is diverted to the surrounding areas to change the flow direction of the low-temperature flue gas. This prevents the low-temperature flue gas entering the inner cylinder through the exhaust port of the inlet pipe from flowing directly upward or downward, thus dispersing the low-temperature flue gas more evenly in all directions. Therefore, this parallel low-temperature flue gas cross-flow purification device further improves the purification effect on low-temperature flue gas.

[0022] Optionally, the parallel low-temperature flue gas cross-flow purification device further includes a feed pipe. The smoke-separating plate, located in the innermost cavity of the innermost adsorbent cylinder, is funnel-shaped to form an adsorbent collection hopper. The feed pipe is connected to the lower end of the adsorbent collection hopper, and the lower end of the feed pipe extends to the bottom of the inner cavity of the inner cylinder. This invention collects small particles of adsorbent that fall from the adsorbent cavity through the adsorbent collection hopper and discharges the collected adsorbent through the feed pipe, thus avoiding the problem of adsorbent accumulation in the inner cavity of the inner cylinder.

[0023] Optionally, the adsorbent cartridges are two, including an inner adsorbent cartridge and an outer adsorbent cartridge sleeved outside the inner adsorbent cartridge.

[0024] Optionally, within the same adsorbent cylinder section, the pore size of the adsorbent pores in the adsorbent layer decreases along the flow direction of the low-temperature flue gas. This decreasing pore size within the adsorbent layer along the flow direction of the low-temperature flue gas allows the parallel low-temperature flue gas cross-flow purification device to improve the purification efficiency of substances in the low-temperature flue gas.

[0025] Optionally, the adsorption tower is vertical, and the axial direction of the plurality of adsorbent cylinders extends in the vertical direction. Compared with the horizontal adsorption tower, the vertical adsorption tower has the advantages of simple structure and small space occupation.

[0026] Optionally, the adsorbent is a low-temperature flue gas adsorbent, which is spherical or cylindrical and includes a permeable outer shell and multiple adsorbent particles or multiple adsorbent particles covered with a permeable membrane inside the permeable outer shell. The permeable outer shell is provided with vents for the low-temperature flue gas to enter and exit. The diameter of the adsorbent particles is 1 mm to 10 mm, and the diameter of the adsorbent is 10 mm to 100 mm. The adsorbent can flow downwards in the adsorption permeable cylinder, and the low-temperature flue gas flows upwards from the bottom of the adsorption tower, alternately passing through different adsorbent cylinder sections in the inward and outward directions. The parallel low-temperature flue gas cross-flow purification device of the present invention, through the setting of a fluid adsorbent, allows the adsorbent to flow downwards in the adsorbent cylinder, while the low-temperature flue gas flows upwards from the bottom of the adsorption tower, passing through multiple gas chambers in sequence (the adsorbent on the upper side has a lower flue gas adsorption saturation, resulting in a stronger adsorption capacity). Therefore, this parallel low-temperature flue gas cross-flow purification device improves the efficiency and effect of flue gas purification.

[0027] The low-temperature flue gas treatment system of the present invention includes a cooling tower and a parallel low-temperature flue gas cross-flow purification device according to any of the above, wherein the cooling tower is connected to the parallel low-temperature flue gas cross-flow purification device and is used to supply the flue gas supplied to the parallel low-temperature flue gas cross-flow purification device as low-temperature flue gas below room temperature. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the parallel low-temperature flue gas cross-flow purification device of the present invention, wherein the arrows in the figure indicate the flow direction of flue gas in the low-temperature flue gas cross-flow purification device.

[0029] Figure 2 This is a schematic diagram showing the assembly of the smoke baffle, the material guide pipe, and the adsorbent collection component in an embodiment of the present invention.

[0030] Figure 3 This is a cross-sectional view of the parallel low-temperature flue gas cross-flow purification device of the present invention.

[0031] Figure label:

[0032] 100 parallel low-temperature flue gas cross-flow purification equipment;

[0033] Adsorption tower body 1; upper conical tower section 11; intermediate cylinder section 12; lower conical tower section 13;

[0034] Air chamber 14; First air chamber 141; Second air chamber 142; Third air chamber 143;

[0035] Adsorbent cartridge 2;

[0036] Inner cylinder 21; outer cylinder 22; adsorbent section 23; transition section 24; diameter reduction section 241; return port 242;

[0037] Upstream adsorbent cylinder layer 201; Midstream adsorbent cylinder layer 202; Downstream adsorbent cylinder layer 203;

[0038] Adsorbent chamber 25; Ventilation channel 26;

[0039] Adsorbent layer 3;

[0040] Smoke baffle 4;

[0041] Smoke inlet pipe 5;

[0042] Flue gas dispersion plate 6;

[0043] Material feeding pipe 7;

[0044] Adsorbent collection component 8. Detailed Implementation

[0045] 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.

[0046] The following is for reference. Figures 1-3 The parallel low-temperature flue gas cross-flow purification device 100 and the low-temperature flue gas treatment system are described in embodiments of the present invention.

[0047] The parallel low-temperature flue gas cross-flow purification device 100 of this invention includes an adsorption tower body 1 and multiple adsorbent cylinders 2.

[0048] The adsorption tower body 1 is provided with a flue gas inlet for supplying low-temperature flue gas below room temperature into the adsorption tower body and a flue gas outlet for discharging clean low-temperature flue gas. Each adsorbent cylinder 2 includes an inner cylinder 21 and an outer cylinder 22. The space between the inner cylinder 21 and the outer cylinder 22 of the same adsorbent cylinder 2 forms an adsorbent cavity 25, which is used to contain adsorbent to form an adsorbent layer. Multiple adsorbent cylinders 2 are nested within the adsorption tower body 1, with adjacent adsorbent cylinders 2 spaced apart from each other. The adsorbent cylinder 2 is divided into multiple adsorbent cylinder segments 23 along its axial direction. The annular space between the outermost adsorbent cylinder 2 and the adsorption tower body 1, the annular space between adjacent adsorbent cylinders 2, and the inner cavity of the inner cylinder 21 of the innermost adsorbent cylinder 2 are respectively provided with smoke baffles 4 to isolate multiple gas chambers 14. The gas chambers 14 and the adsorbent cylinder segments 23 are arranged alternately in the flow direction of the low-temperature flue gas in the adsorption tower body 1. The multiple adsorbent cylinder segments 23 corresponding to each other in the radial direction of the adsorbent cylinder 2 constitute an adsorbent cylinder segment layer. Adjacent adsorbent cylinder segment layers include an upstream adsorbent cylinder segment layer 201 and a downstream adsorbent cylinder segment layer 203. The low-temperature flue gas passes through multiple adsorbent cylinder segments 23 in the upstream adsorbent cylinder segment layer 201 in one of the inward and outward directions and the outward and inward directions, and then passes through multiple adsorbent cylinder segments 23 in the downstream adsorbent cylinder segment layer in another of the inward and outward directions and the outward and inward directions.

[0049] The parallel low-temperature flue gas cross-flow purification device 100 of the present invention arranges multiple adsorbent cylinders 2 in a nested manner within the adsorption tower. This means that the low-temperature flue gas passes sequentially through multiple layers of adsorbent cylinders 2 along the radial direction of the adsorption tower, undergoing contact adsorption purification with the adsorbent layers in each layer. While ensuring the flue gas purification effect, the thickness of the adsorbent layer in each adsorbent cylinder 2 is reduced, thereby reducing the resistance of the low-temperature flue gas as it passes through the adsorbent layer. This increases the flow rate and diffusion rate of the low-temperature flue gas, overcoming the problem of high resistance caused by directly allowing the low-temperature flue gas to pass through a thicker adsorbent layer. Therefore, the adsorbent cylinder arrangement of this structure improves the purification efficiency of the low-temperature flue gas.

[0050] Furthermore, the reduced thickness of the adsorbent layer in each adsorbent cylinder 2 and the decreased resistance to low-temperature flue gas flow are conducive to achieving uniform contact between the low-temperature flue gas and the adsorbent, further improving the contact effect between the adsorbent and the flue gas. This is particularly important for the adsorption of low-temperature flue gas, as it enhances the adsorption utilization rate of the adsorbent, effectively avoids uneven adsorbent saturation, and prevents waste of the adsorbent.

[0051] Furthermore, the parallel low-temperature flue gas cross-flow purification device 100 of the present invention reduces the flow resistance of the low-temperature flue gas, thereby reducing the pressure in each chamber and thus lowering the airtightness requirements of the chambers within the adsorption tower. Consequently, the parallel low-temperature flue gas cross-flow purification device 100 reduces the processing and manufacturing costs to some extent. Simultaneously, by alternating the multi-stage chambers and multi-stage adsorbent cylinders 2 along the flow direction of the low-temperature flue gas within the low-temperature flue gas cross-flow purification device, the clean flue gas ultimately discharged from the flue gas outlet undergoes multiple, multi-stage cross-flow low-temperature adsorption purification processes, resulting in more thorough purification of the low-temperature flue gas by the adsorbent, thereby achieving near-zero emissions.

[0052] Furthermore, in the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment, by alternately arranging the multi-stage gas chambers 14 and multi-stage adsorbent cylinders 2 along the flow direction of the low-temperature flue gas within the device 100, the travel distance of the low-temperature flue gas within the adsorbent cylinders 2 is greatly increased. The multi-stage, multi-stage adsorption purification method increases the number of adsorption cycles, thereby improving the adsorption purification effect. It also facilitates thinning of the adsorbent layer within each adsorbent cylinder 2, further reducing the flow resistance of the flue gas as it passes through a single adsorbent cylinder 2. This overcomes the problem of low flue gas diffusion and flow rates under low-temperature conditions affecting the flue gas purification efficiency. Therefore, the purification efficiency of the low-temperature flue gas cross-flow purification device 100 is further improved.

[0053] Moreover, since the adsorbent cylinder 2 has a hollow structure, multiple adsorbent cylinders 2 are nested in the adsorption tower body, resulting in a compact structure. This fully utilizes the internal space of the adsorption tower body of the purification equipment to fill the adsorbent, improving space utilization. Compared with the linear bed in related technologies, under the same total amount of adsorbent filling in the adsorption tower body, the parallel low-temperature flue gas cross-flow purification equipment 100 provided by this invention has a volume and floor space reduced by at least 20%, saving the construction cost of the purification equipment.

[0054] Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of the present invention has the advantages of being easy to manufacture and improving the purification efficiency of low-temperature flue gas.

[0055] It should be noted that the basic principle of low-temperature flue gas adsorbents is to remove pollutant components from low-temperature flue gas through adsorption. The inventors have realized through research that in low-temperature environments, preferably below zero degrees Celsius, such as -80℃ to -5℃, and more preferably -20℃ to -15℃, nitrogen oxides in the flue gas undergo low-temperature oxidation adsorption on the surface of adsorbents such as activated carbon. This oxidizes the difficult-to-adsorb NO into easily adsorbable NO2, achieving a several-hundred-fold increase in adsorption capacity.

[0056] Furthermore, the adsorption capacity for SO2, CO2, and heavy metals within them is also increased exponentially at low temperatures. The parallel low-temperature flue gas cross-flow purification device 100 of this embodiment absorbs flue gas at low temperatures, significantly increasing the adsorption capacity for sulfur dioxide, CO2, and heavy metals in the flue gas. Especially for NO flue gas, which is difficult to adsorb, the treatment efficiency increases exponentially. The low-temperature flue gas passes through the adsorbent cylinder 2 of the parallel low-temperature flue gas cross-flow purification device along its height direction (…). Figure 1 The layer of adsorbent tubes (shown in the up-down direction) has multiple segments, which can more thoroughly adsorb harmful substances in flue gas.

[0057] Specifically, the "multi-layer" in the parallel low-temperature flue gas cross-flow purification equipment refers to the arrangement of multiple adsorbent layers, and "parallel" means that the gas chambers within each adsorbent cylinder section are arranged in parallel. "Cross-flow" means that each adsorbent cylinder section is divided into multiple adsorbent layers. The low-temperature flue gas passes sequentially through the downstream adsorbent cylinder section in an inward-outward or outward-inward direction, and then sequentially flows through the next adsorbent cylinder section until it is discharged through the upstream adsorbent cylinder section, in other words, it flows in an alternating manner.

[0058] Furthermore, by nesting multiple adsorbent cylinders 2 within the adsorption tower body 1, the pressure in the gas chamber 14 formed along the flow direction of the low-temperature flue gas is reduced for the same layer of adsorbent cylinder segments, thereby improving the smoothness of the flow of the low-temperature flue gas between the same layer of adsorbent cylinder segments.

[0059] When using a traditional linear cross-flow adsorption tower for low-temperature adsorption of flue gas, the thickness of the cross-flow bed must be at least 2m to ensure the adsorption purification rate. In the parallel low-temperature flue gas cross-flow purification device provided in this embodiment of the invention, the thickness of a single adsorbent layer in each adsorbent cylinder can be less than 1 meter, which can significantly reduce the resistance of the flue gas to cross-flow and improve the purification efficiency. Optionally, the thickness of a single adsorbent layer can be 0.2m to 1m. Further, the thickness of a single adsorbent layer can be 0.2m to 0.5m.

[0060] Optionally, each adsorbent cartridge 2 can be a circular or square cylindrical structure.

[0061] Furthermore, the adsorbent cylinder 2 has multiple adsorbent cylinder segments 23, which are joined together axially and stacked within the adsorption tower body 1. The invention is not limited thereto; in other embodiments, the multiple adsorbent cylinders 2 may be formed from a single cylinder.

[0062] like Figure 1 and Figure 3 As shown, the inner and outer walls of the adsorbent cylinder section 23 are provided with ventilation channels 26, and a transition cylinder section 24 is provided between adjacent adsorbent cylinder sections 23 of the same adsorbent cylinder. The transition cylinder section 24 has a reduced diameter section 241, and the inner and outer walls of the transition cylinder section 24 are gas-blocking walls.

[0063] The parallel low-temperature flue gas cross-flow purification device 100 of this invention, by setting the inner and outer walls of the transition section 24 as air-blocking walls, can prevent low-temperature flue gas from entering the adjacent adsorbent section 23 and the adjacent gas chamber 14 through this area, thereby reducing the cross-flow of low-temperature flue gas between the adjacent adsorbent section 23 and the adjacent gas chamber 14. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this invention further improves the purification effect on low-temperature flue gas.

[0064] Optionally, the inner and outer walls of the adsorbent cylinder section can be made of grid mesh, through which low-temperature flue gas can enter the adsorbent layer.

[0065] like Figure 1 and Figure 3 As shown, the inner cylinder 21 and the outer cylinder 22 have a return port 242 at the reduced diameter section. The smoke baffle 4 is inclined relative to the horizontal direction. The lower end of the smoke baffle 4 is connected to the lower wall of the return port so that the adsorbent falling on the smoke baffle 4 can be introduced into the adsorbent chamber 25.

[0066] This prevents the flue gas from passing through the adsorbent chamber 25 in the transition section 24, thus preventing the low-temperature flue gas from directly flowing into the adjacent gas chamber 14 through the adsorbent chamber 25, thereby further reducing the cross-flow of low-temperature flue gas between adjacent gas chambers 14. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment further improves the purification effect of low-temperature flue gas.

[0067] In addition, by connecting the outer edge of the smoke baffle plate 4 to the inner wall of the adsorption tower 1, and connecting the inner edge of the smoke baffle plate 4 between the inner wall of the adsorption tower 1 and the outer cylinder 22 to the lower wall of the return port 242, the adsorbent particles that fall on the smoke baffle plate 4 can be reintroduced into the adsorbent cavity 25, thereby further avoiding the problems of adsorbent accumulation on the smoke baffle plate 4, difficulty in cleaning, and impact on the flow of low-temperature flue gas.

[0068] Specifically, the height of the outer edge of the smoke-proof plate 4 located in the inner cavity of the inner cylinder 21 is lower than the height of the inner edge of the smoke-proof plate 4. The outer edge of the smoke-proof plate 4 is connected to the transition cylinder section 24. The height of the outer edge of the smoke-proof plate 4 located between the inner wall of the adsorption tower body 1 and the outer cylinder 22 is higher than the height of the inner edge of the smoke-proof plate 4. The outer edge of the smoke-proof plate 4 located between the inner wall of the adsorption tower body 1 and the outer cylinder 22 is connected to the inner wall of the adsorption tower body 1. The inner edge of the smoke-proof plate 4 located between the inner wall of the adsorption tower body 1 and the outer cylinder 22 is connected to the diameter reduction section 241.

[0069] Furthermore, a smoke-separating plate 4 is provided between the outer wall of the transition cylinder section 24 and the inner wall of the adsorption tower body 1 to divide the cavity between the outer cylinder 22 and the inner wall of the adsorption tower body 1 into multiple first gas chambers 141. A smoke-separating plate 4 is provided between adjacent adsorbent cylinders to divide the inner cavity into multiple second gas chambers 142. A smoke-separating plate 4 is provided in the inner cavity of the inner cylinder 21 to divide the inner cavity into multiple third gas chambers 143. For the upstream adsorbent cylinder section layer, along the flow direction of the low-temperature flue gas in the low-temperature flue gas cross-flow purification device, the first gas chamber 141, the innermost adsorbent chamber 25, the second gas chamber 142, the second layer adsorbent chamber 25, ..., the outermost adsorbent chamber 25 and the third gas chamber 143 flow in series. The low-temperature flue gas flowing through the third chamber 143 of the downstream adsorbent cylinder layer flows into the third chamber 143 of the next adsorbent cylinder layer, and then sequentially passes through the outermost adsorbent chamber 25, the second outermost chamber 14, ..., the second adsorbent chamber 25, the second chamber 142 and the innermost adsorbent chamber 25; and so on, until it is discharged from the adsorption tower 1.

[0070] like Figure 1 and Figure 3 As shown, in adjacent adsorbent cylinder sections 23 of the same adsorbent cylinder, the volume of the adsorbent cavity 25 in the upstream adsorbent cylinder section 23 is larger than the volume of the adsorbent cavity 25 in the downstream adsorbent cylinder section 23. It can be understood that the amount of adsorbent in the upstream adsorbent cylinder is greater than the amount of adsorbent used in the adsorbent cavity 25 of the downstream adsorbent cylinder.

[0071] Because the concentration of the substances to be adsorbed in the low-temperature flue gas flowing through the upstream adsorbent cylinder is much higher than that in the downstream adsorbent cylinder, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention matches the adsorption capacity of the adsorbent layer with the concentration of the flue gas. Therefore, as the concentration of the substances to be adsorbed in the low-temperature flue gas decreases, the amount of adsorbent also decreases. Consequently, the total amount of adsorbent used is reduced (by 10% to 17%). Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention has the advantage of further cost savings.

[0072] The embodiments of the present invention are not limited thereto; the length of the adsorbent cavity 25 of the adsorbent section 23 in the upstream adsorbent section layer is greater than the length of the adsorbent cavity 25 of the adsorbent section 23 in the downstream adsorbent section layer. Similarly, the parallel low-temperature flue gas cross-flow purification device 100 of the embodiments of the present invention has the advantage of further cost savings.

[0073] like Figure 1 and Figure 3 As shown, the innermost adsorbent cylinder 21 has a flue gas inlet pipe 5 in its inner cavity. The lower end of the flue gas inlet pipe 5 extends downward into the upstream gas chamber 14 in the flow direction of the low-temperature flue gas within the inner cavity of the innermost adsorbent cylinder 21.

[0074] Because the low-temperature flue gas will rise upwards in the inner cylinder 21 of the adsorbent cylinder under the action of air, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention can increase the flow time of the low-temperature flue gas around the adsorption tower 1 and the contact area with the adsorbent by extending the lower end of the flue gas inlet pipe 5 downwards in the inner cavity of the inner cylinder 21 to the uppermost gas chamber located at the bottom of the inner cavity. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention has the advantage of further improving the purification effect.

[0075] like Figure 1 and Figure 3 As shown, a smoke-proof plate 4 is provided in the inner cavity of the innermost adsorbent cylinder 21 to divide the inner cavity of the innermost adsorbent cylinder 21 into two gas chambers 14. A smoke-proof plate 4 is provided in the annular space between the outermost adsorbent cylinder and the adsorption tower body 1 to divide the annular space between the outermost adsorbent cylinder and the adsorption tower body 1 into two gas chambers 14. Two smoke-proof plates 4 are provided in the annular space between adjacent adsorbent cylinders to divide the annular space between adjacent adsorbent cylinders into three gas chambers 14.

[0076] The parallel low-temperature flue gas cross-flow purification device 100 of this invention has a smoke-separating plate 4 in the inner cavity of the innermost adsorbent cylinder 21 to divide the inner cavity of the innermost adsorbent cylinder 21 into two gas chambers 14. A smoke-separating plate 4 is provided in the annular space between the outermost adsorbent cylinder and the adsorption tower body 1 to divide the annular space between the outermost adsorbent cylinder and the adsorption tower body 1 into two gas chambers 14. Two smoke-separating plates 4 are provided in the annular space between adjacent adsorbent cylinders to divide the annular space between adjacent adsorbent cylinders 2 into three gas chambers 14.

[0077] Therefore, by providing two smoke-proof plates 4 in the annular space between adjacent adsorbent cylinders 2, the annular space between adjacent adsorbent cylinders 2 is divided into three gas chambers 14, which has the advantage of simple structure.

[0078] Optionally, such as Figure 1 and Figure 3 As shown, the parallel low-temperature flue gas cross-flow purification device 100 also includes a material guiding pipe. The flue plate in the inner cavity of the innermost adsorbent cylinder is funnel-shaped to form an adsorbent collection hopper. The material guiding pipe 7 is connected to the lower port of the adsorbent collection hopper, and the lower end of the material guiding pipe 7 extends to the bottom of the inner cavity of the inner cylinder.

[0079] The parallel low-temperature flue gas cross-flow purification device 100 of this invention avoids the problem of adsorbent accumulation in the inner cavity of the inner cylinder by setting an adsorbent collection hopper in the inner cavity of the inner cylinder. The adsorbent collection hopper collects small particles of adsorbent that fall from the adsorbent cavity and discharges the collected adsorbent through a feed pipe. In addition, the smoke baffles 4 can all be set at an angle. Because the angled smoke baffles 4 can increase the contact area with the low-temperature flue gas when blocking the low-temperature flue gas, it can reduce the impact of the flue gas on the corresponding smoke baffles 4. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this invention has the advantage of reducing the noise within the flue gas purification device 100.

[0080] like Figure 1 and Figure 2 As shown, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention also includes an adsorbent collection component 8. The adsorbent collection component 8 includes a storage bag and an elastic flat nozzle. The storage bag is located at the lower end of the material guiding pipe, and the elastic flat nozzle is located at the lower end of the storage bag. In its natural state, the inner wall of the elastic flat nozzle is closed and sealed. Under the action of impact force and gravity, the inner wall of the elastic flat nozzle opens to discharge the material in the storage bag.

[0081] The parallel low-temperature flue gas cross-flow purification device 100 of this invention uses an adsorbent collection component 8 divided into a storage bag and an elastic flat nozzle. This allows for the adsorption of scattered adsorbent and the sealing of the storage bag via the elastic flat nozzle, with automatic discharge under certain conditions. This prevents low-temperature flue gas from flowing between the two inner and outer gas chambers through the material guide pipe 7. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 has the advantage of further improving the purification effect.

[0082] Specifically, such as Figure 1 and Figure 3 As shown, each adsorbent cartridge is divided into three adsorbent sections 23. The adsorbent sections 23 of multiple adsorbent cartridges constitute an upstream adsorbent section layer 201, a midstream adsorbent section layer 202, and a downstream adsorbent section layer 203 arranged along the flue gas flow direction. The flue gas passes through the upstream adsorbent section layer 201 sequentially in an inward and outward direction from the uppermost gas chamber 14, then passes through the midstream adsorbent section layer 202 sequentially in an outward and inward direction, and finally passes through the downstream adsorbent section layer 203 sequentially in an outward and inward direction. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment of the invention has the advantages of simple structure and low design difficulty.

[0083] Specifically, a smoke-separating plate 4 is provided between the outer wall of the transition cylinder section 24 and the inner wall of the adsorption tower body 1 to divide the cavity between the outer cylinder 22 and the inner wall of the adsorption tower body 1 into multiple first gas chambers 141. A smoke-separating plate 4 is provided between adjacent adsorbent cylinders to divide the inner cavity into multiple second gas chambers 142. A smoke-separating plate 4 is provided in the inner cavity of the inner cylinder 21 to divide the inner cavity into multiple third gas chambers 143. For the upstream adsorbent cylinder section layer 201, along the flow direction of the flue gas in the parallel low-temperature flue gas cross-flow purification equipment 100, the first gas chamber 141, the innermost adsorbent chamber 25, the second gas chamber 142, the second layer adsorbent chamber 25, and the third gas chamber 143 flow in series. The flue gas flowing through the third chamber 143 of the downstream adsorbent cylinder layer flows into the third chamber 143 of the midstream adsorbent cylinder layer 202, and then sequentially passes through the third chamber 143 of the midstream adsorbent cylinder layer 202, the second layer adsorbent chamber 25, and the innermost adsorbent chamber 25. For the downstream adsorbent cylinder layer 203, along the flow direction of the flue gas in the parallel low-temperature flue gas cross-flow purification device 100, the first chamber 141, the innermost adsorbent chamber 25, the second chamber 142, the second layer adsorbent chamber 25, and the third chamber 143 flow in series, and then are collected and discharged through the gas outlet at the top of the adsorption tower 1.

[0084] like Figure 1 and Figure 3 As shown, the adsorption tower body 1 is provided with a flue gas dispersion plate 6. The flue gas dispersion plate 6 is located at one end of the intermediate cylinder section 12 adjacent to the lower cone tower section 13. The flue gas dispersion plate 6 has an upwardly convex conical surface.

[0085] The parallel low-temperature flue gas cross-flow purification device 100 of this invention features a flue gas dispersion plate 6 with a convex conical surface installed at one end of the intermediate cylinder section 12 adjacent to the lower conical tower section 13 within the adsorption tower body 1. This allows the low-temperature flue gas discharged from the inlet pipe 5 to be diverted in all directions, changing its flow direction. The low-temperature flue gas entering the inner cylinder through the exhaust port of the inlet pipe 5 does not flow directly upwards or downwards, but rather its flow direction is altered by the flue gas dispersion plate 6, resulting in a more uniform diffusion of the low-temperature flue gas to the surrounding area. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this invention further improves the purification effect on the flue gas.

[0086] Furthermore, the smoke-proof plate in the inner cavity of the innermost adsorbent cylinder and the smoke-proof plate in the annular space between the outermost adsorbent cylinder and the adsorption tower body can both be bucket-shaped structures to collect and discharge the falling material in a timely manner.

[0087] Specifically, the flue gas dispersion plate 6 can be a conical plate, and the outer edge of the flue gas dispersion plate 6 is connected to the lower end of the innermost adsorbent cylinder 2.

[0088] Specifically, such as Figure 1 and Figure 3 As shown, the adsorbent cartridge consists of two parts: an inner adsorbent cartridge and an outer adsorbent cartridge that is fitted over the inner adsorbent cartridge. This design offers advantages such as simple structure and easy installation.

[0089] like Figure 1 and Figure 3 As shown, the adsorption tower 1 is vertical, and multiple adsorbent cylinders extend axially in the vertical direction. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment has the advantages of simple structure and small footprint.

[0090] Within the same adsorbent cylinder section, the number of adsorption pores in the adsorbent layer 3 decreases along the flue gas flow direction. This allows for layered purification of different substances in the flue gas. Therefore, this embodiment of the invention has the advantage of improving the efficiency of flue gas purification.

[0091] For example, Figure 1 As shown, in the downstream adsorbent cylinder layer 203, along the direction from the inside out, the adsorption pores of the adsorbent layer 3 in the inner adsorbent cylinder 2 are larger than those in the outer adsorbent cylinder 2; in the midstream adsorbent cylinder layer 202, along the direction from the inside out, the adsorption pores of the adsorbent layer 3 in the inner adsorbent cylinder 2 are smaller than those in the outer adsorbent cylinder 2; and in the upstream adsorbent cylinder layer 201, the adsorption pores of the adsorbent layer 3 in the inner adsorbent cylinder 2 are larger than those in the outer adsorbent cylinder 2.

[0092] Furthermore, if the adsorbent is a non-flowing adsorbent, the pore sizes of the adsorbent layer 3 in the downstream adsorbent cylinder layer 203, the adsorbent layer 3 in the midstream adsorbent cylinder layer 202, and the adsorbent layer 3 in the upstream adsorbent cylinder layer 201 decrease sequentially.

[0093] The adsorbent is a free-flowing adsorbent that flows downwards within the adsorbent cylinder, while the flue gas flows upwards from the bottom of the adsorption tower 1, sequentially passing through multiple gas chambers 14. Therefore, the problem of adsorbent layer 3 saturation in a certain adsorbent chamber 25 can be reduced, thus improving the adsorption efficiency while ensuring sufficient adsorption of the flue gas. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 of this embodiment combines the advantages of high purification efficiency and good purification effect.

[0094] Furthermore, the adsorbent is a low-temperature flue gas adsorbent, which is spherical or cylindrical and includes a permeable shell and multiple adsorbent particles or multiple adsorbent particles covered with a permeable membrane inside the permeable shell. The permeable shell is provided with permeable holes for the low-temperature flue gas to enter and exit. The diameter of the adsorbent particles is 1 mm to 10 mm, and the diameter of the adsorbent is 10 mm to 100 mm. The adsorbent can flow downward in the adsorption permeable cylinder, and the low-temperature flue gas flows upward from the bottom of the adsorption tower and passes through multiple adsorbent cylinder sections alternately from the inside-outside direction and the outside-inside direction.

[0095] The parallel low-temperature flue gas cross-flow purification device 100 of this invention uses a fluid adsorbent, which flows downwards within the adsorbent cylinder 2, while the flue gas flows upwards from the bottom of the adsorption tower 1, sequentially passing through multiple gas chambers 14. This increases the contact time of the flue gas with the adsorbent in the adsorbent chamber 25, thereby ensuring sufficient adsorption of the flue gas. Therefore, the parallel low-temperature flue gas cross-flow purification device 100 improves the efficiency of flue gas purification and also possesses the advantages of high purification efficiency and effective purification.

[0096] Furthermore, the adsorbent cartridge has vents, allowing flue gas to enter the cartridge through these vents. The flue gas can also pass through the gaps between adjacent adsorbents and / or the pores within the adsorbent itself. This reduces dust generation caused by direct collisions and friction between the adsorbents.

[0097] Alternatively, the particulate adsorbent can be a spherical or cylindrical adsorbent formed from powder or particulate adsorbent by a binder.

[0098] Specifically, the adsorption tower 1 includes an upper conical section 11, an intermediate cylindrical section 12, and a lower conical section 13 arranged sequentially from top to bottom. The intermediate cylindrical section 12 is cylindrical. The adsorbent is housed in the intermediate cylindrical section 12. The upper conical section 11 is provided with an inlet for supplying adsorbent into the adsorbent chamber 25, and the lower conical section 13 is provided with an outlet for discharging the adsorbent.

[0099] Optionally, the thickness of the space between the inner cylinder 21 and the outer cylinder 22 is 10 mm to 100 mm.

[0100] The low-temperature flue gas treatment system of this invention includes a cooling tower and a parallel low-temperature flue gas cross-flow purification device 100 of any of the above embodiments. The cooling tower is connected to the parallel low-temperature flue gas cross-flow purification device 100 and is used to supply the flue gas supplied to the parallel low-temperature flue gas cross-flow purification device 100 as low-temperature flue gas below room temperature.

[0101] Therefore, the low-temperature flue gas treatment system of the present invention has the advantages of being easy to manufacture and improving the purification efficiency of flue gas.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A parallel low-temperature flue gas cross-flow purification device, characterized in that, include: An adsorption tower body is provided with a flue gas inlet that can supply low-temperature flue gas below room temperature into the adsorption tower body and a flue gas outlet that can discharge clean low-temperature flue gas. and Multiple adsorbent cartridges, each comprising an inner cylinder and an outer cylinder, with the space between the inner and outer cylinders forming an adsorbent cavity for containing adsorbent to form an adsorbent layer, are nested within the adsorption tower body, with adjacent cartridges spaced apart. Each cartridge is divided into multiple segments along its axial direction. Smoke baffles are provided in the annular space between the outermost cartridge and the adsorption tower body, the annular space between adjacent cartridges, and the inner cavity of the innermost cartridge. Multiple gas chambers are isolated, and the gas chambers and the adsorbent cylinder segments are arranged alternately in the flow direction of the low-temperature flue gas in the adsorption tower. Multiple adsorbent cylinder segments corresponding to each other in the radial direction of the adsorbent cylinder form an adsorbent cylinder segment layer. Adjacent adsorbent cylinder segment layers include an upstream adsorbent cylinder segment layer and a downstream adsorbent cylinder segment layer. The low-temperature flue gas passes through multiple adsorbent cylinder segments in the upstream adsorbent cylinder segment layer in sequence along one of the inward and outward directions and the outward and inward directions, and then passes through multiple adsorbent cylinder segments in the downstream adsorbent cylinder segment layer in sequence along the other of the inward and outward directions and the outward and inward directions. The innermost adsorbent cylinder has a flue gas inlet pipe in its inner cavity. The lower end of the flue gas inlet pipe extends downward from the inner cavity of the innermost adsorbent cylinder to the upstream gas chamber in the flow direction of the low-temperature flue gas. In adjacent adsorbent cylinder segments of the same adsorbent cylinder, the volume of the adsorbent cavity in the upstream adsorbent cylinder segment layer is greater than the volume of the adsorbent cavity in the downstream adsorbent cylinder segment layer; and / or, the length of the adsorbent cavity in the upstream adsorbent cylinder segment layer is a, and the length of the adsorbent cavity in the downstream adsorbent cylinder segment layer is b, where a is greater than b.

2. The parallel low-temperature flue gas cross-flow purification device according to claim 1, characterized in that, The inner and outer walls of the adsorbent cylinder section are provided with ventilation channels, and a transition cylinder section is provided between adjacent adsorbent cylinder sections of the same adsorbent cylinder. The transition cylinder section has a reduced diameter section, and the inner and outer walls of the transition cylinder section are gas-blocking walls.

3. The parallel low-temperature flue gas cross-flow purification device according to claim 2, characterized in that, The reduced diameter section has a return port, and the smoke baffle is inclined relative to the horizontal direction. The smoke baffle has an inner end and an outer end along the inner and outer directions of the adsorption tower body. The lower end of the inner end and the outer end is connected to the lower wall of the return port so that the adsorbent falling on the smoke baffle is introduced into the adsorbent cavity.

4. The parallel low-temperature flue gas cross-flow purification device according to claim 1, characterized in that, The innermost adsorbent cylinder has a smoke-proof plate in its inner cavity, which divides the inner cavity of the innermost adsorbent cylinder into two gas chambers. The outermost adsorbent cylinder has a smoke-proof plate in its annular space with the adsorption tower body, which divides the annular space between the outermost adsorbent cylinder and the adsorption tower body into two gas chambers. The annular space between adjacent adsorbent cylinders has two smoke-proof plates in its annular space, which divides the annular space between adjacent adsorbent cylinders into three gas chambers.

5. The parallel low-temperature flue gas cross-flow purification device according to claim 4, characterized in that, Each adsorbent cartridge is divided into three adsorbent cartridge segments. The adsorbent cartridge segments of the multiple adsorbent cartridges constitute an upstream adsorbent cartridge segment layer, a midstream adsorbent cartridge segment layer, and a downstream adsorbent cartridge segment layer arranged along the flow direction of the low-temperature flue gas. The low-temperature flue gas passes through the upstream adsorbent cartridge segment layer in sequence from the uppermost gas chamber in an inward and outward direction, then passes through the midstream adsorbent cartridge segment layer in sequence in an outward and inward direction, and finally passes through the downstream adsorbent cartridge segment layer in sequence in an outward and inward direction.

6. The parallel low-temperature flue gas cross-flow purification device according to claim 4, characterized in that, The adsorption tower is equipped with a flue gas dispersion plate, which is located at the lower end of the upstream adsorbent cylinder section. The flue gas dispersion plate has an upwardly convex conical surface. And / or, it also includes a feed conduit, wherein the smoke baffle is funnel-shaped to form an adsorbent collection hopper in the inner cavity of the innermost adsorbent cylinder, the feed conduit is connected to the lower port of the adsorbent collection hopper, and the lower end of the feed conduit extends to the bottom of the inner cavity of the inner cylinder.

7. The parallel low-temperature flue gas cross-flow purification device according to any one of claims 1-5, characterized in that, The adsorbent cylinder consists of two cylinders, including an inner adsorbent cylinder and an outer adsorbent cylinder sleeved outside the inner adsorbent cylinder. Within the same adsorbent cylinder section, the pore size of the adsorbent pores in the adsorbent layer decreases along the flow direction of the low-temperature flue gas.

8. The parallel low-temperature flue gas cross-flow purification device according to any one of claims 1-5, characterized in that, The adsorbent is spherical or cylindrical and includes a permeable outer shell and multiple adsorbent particles or multiple adsorbent particles covered with a permeable membrane inside the permeable outer shell. The permeable outer shell is provided with vents for the low-temperature flue gas to enter and exit. The diameter of the adsorbent particles is 1 mm to 10 mm, and the diameter of the adsorbent is 10 mm to 100 mm. The adsorbent can flow downward in the adsorption permeable cylinder, and the low-temperature flue gas flows upward from the bottom of the adsorption tower and passes through multiple adsorbent cylinder sections alternately from the inside-outside direction and the outside-inside direction.

9. A low-temperature flue gas treatment system, characterized in that, The device includes a cooling tower and a parallel low-temperature flue gas cross-flow purification device according to any one of claims 1-8, wherein the cooling tower is connected to the parallel low-temperature flue gas cross-flow purification device and is used to supply flue gas supplied to the parallel low-temperature flue gas cross-flow purification device as low-temperature flue gas below room temperature.

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