Low-temperature adsorption and regeneration system

Abstract

A low-temperature adsorption and regeneration system, comprising an adsorption tower, a regeneration tower and a regenerated-enriched-gas treatment device (100), wherein the adsorption tower is provided with a flue gas inlet and a clean-flue-gas outlet, and the adsorption tower is internally provided with an adsorbent, which is used for adsorbing flue gas at low temperature and purifying same into low-temperature clean flue gas; the regeneration tower is used for performing regeneration desorption on the adsorption-saturated adsorbent in the adsorption tower, and the regeneration tower is provided with a regenerated-enriched-gas outlet for discharging regenerated enriched gas; and the regenerated-enriched-gas treatment device (100) is in communication with the regenerated-enriched-gas outlet of the regeneration tower and is used for separating water vapor from solid particles in the regenerated enriched gas.

Description

Low temperature adsorption regeneration system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410021197.0 and application date of January 4, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the technical field of flue gas purification, and in particular to a low-temperature adsorption regeneration system. Background Art

[0004] In the related art, the high-temperature flue gas (usually at 200°C) discharged from the coal-fired boiler is generally desulfurized and denitrified through an adsorption tower and a regeneration tower, wherein the flue gas discharged from the coal-fired boiler enters the adsorption tower, and the sulfides and nitrides in the flue gas are absorbed by the adsorbent in the adsorption tower. The adsorbent saturated with adsorption is transported to the heating section of the regeneration tower for heating and desorption. The sulfides and nitrides are desorbed from the adsorbent and recycled. The desorbed adsorbent returns to the adsorption tower to continue to adsorb the sulfides and nitrides in the flue gas. Therefore, the adsorbent is circulated between the adsorption tower and the regeneration tower to continuously remove the sulfides and nitrides in the flue gas. However, the higher the adsorption environment temperature, the lower the adsorption efficiency of the adsorbent. High-temperature adsorption will lead to high adsorbent consumption, poor adsorption effect, and a high nitrogen oxide content in the clean flue gas after adsorption. Summary of the Invention

[0005] This application is based on the inventor's discovery and understanding of the following facts and problems:

[0006] Related technologies have proposed low-temperature flue gas adsorption technology. This involves first cooling high-temperature flue gas to a subzero temperature in a spray cooling tower, for example. This low-temperature flue gas is then fed into an adsorption tower for low-temperature adsorption. The saturated adsorbent is then sent to a regeneration tower for heating and desorption. The regenerated adsorbent is then returned to the adsorption tower for recycling. During low-temperature adsorption, the adsorbent's adsorption capacity increases exponentially in low-temperature environments, significantly improving the adsorption purification rate compared to conventional high-temperature flue gas adsorption, and can achieve near-zero flue gas emissions.

[0007] In the related art, since the regenerated rich gas contains sulfides, nitrogen oxides, adsorbent particles and a large amount of water vapor, on the one hand, the water vapor can easily combine with the sulfides and nitrogen oxides in the regenerated rich gas to generate corrosive acidic liquid, which corrodes the regenerated rich gas transmission pipeline and equipment, resulting in a reduction in the service life of the transmission pipeline and equipment; on the other hand, the adsorbent particles mixed in the regenerated rich gas are transported through the transmission pipeline for a long time, and the accumulation in the transmission pipeline can easily cause blockage of the transmission pipeline.

[0008] The present application aims to solve, at least to some extent, one of the technical problems in the related art. To this end, the present application proposes a low-temperature adsorption regeneration system that can not only extend the service life of the regenerated rich gas transmission pipeline and transmission equipment, but also prevent the transmission pipeline from being blocked.

[0009] The low-temperature adsorption regeneration system of the present application includes an adsorption tower, a regeneration tower and a regeneration rich gas treatment device, the adsorption tower has a flue gas inlet and a clean flue gas outlet, the adsorption tower has an adsorbent for low-temperature adsorption and purification of the flue gas into low-temperature clean flue gas; the regeneration tower is used to desorb and regenerate the adsorbent that is saturated with adsorption in the adsorption tower, and the regeneration tower has a regeneration rich gas outlet for discharging regeneration rich gas; the regeneration rich gas treatment device is connected to the regeneration rich gas outlet of the regeneration tower, and is used to separate water vapor and solid particles in the regeneration rich gas.

[0010] The low-temperature adsorption regeneration system of the present application utilizes a regeneration rich gas treatment device to separate water vapor from the regeneration rich gas, thereby greatly reducing the water vapor content in the regeneration rich gas, and can effectively reduce or even prevent the sulfides and nitrogen oxides in the regeneration rich gas from combining with water vapor to generate corrosive acidic liquids, which corrode the regeneration rich gas conveying pipelines and equipment, thereby reducing the service life of the conveying pipelines and equipment; in addition, the regeneration rich gas treatment device separates the adsorbent solid particles in the regeneration rich gas, which can effectively prevent the adsorbent particles mixed in the regeneration rich gas from being conveyed through the conveying pipeline for a long time and accumulating in the conveying pipeline to cause blockage of the conveying pipeline.

[0011] In some embodiments, the regeneration rich gas processing device includes a tank body, a demister and a condenser, wherein the demister is disposed in the tank body to separate the inner cavity of the tank body into an exhaust cavity and a liquid collecting cavity located below the exhaust cavity, wherein the exhaust cavity has a gas phase outlet, and the liquid collecting cavity has a liquid phase outlet and a solid phase outlet;

[0012] The condenser has an inlet end and an outlet end. The inlet end of the condenser is connected to the regeneration rich gas outlet of the regeneration tower, and the outlet end of the condenser passes through the exhaust chamber and the demister and extends into the liquid collecting chamber. The condenser is used to pass the regeneration rich gas and sub-zero cooling gas into the liquid collecting chamber.

[0013] Therefore, the regeneration rich gas treatment device of the low-temperature adsorption regeneration system of the present application can perform secondary dehumidification and separation of water vapor in the regeneration rich gas and separate solid adsorbent particles, making the regeneration rich gas treatment device simple in structure and low in manufacturing cost.

[0014] In some embodiments, the clean flue gas outlet of the adsorption tower is connected to the inlet of the condenser tube so that the low-temperature clean flue gas discharged from the clean flue gas outlet of the adsorption tower serves as the cooling gas. The low-temperature adsorption regeneration system of the present application utilizes the low-temperature clean flue gas generated after low-temperature adsorption of flue gas in the adsorption tower as cooling gas and passes it into the condenser tube to cool the regenerated rich gas. This fully utilizes the energy of the clean flue gas and eliminates the need for a separate cooling medium to cool the regenerated rich gas, thus saving on the production of cooling medium and thus reducing costs.

[0015] In some embodiments, the low-temperature adsorption regeneration system of the embodiment of the present application further includes a spray cooling tower, the spray cooling tower having a smoke inlet for supplying flue gas into the spray cooling tower and a smoke outlet for discharging the cooled flue gas, the smoke outlet being connected to the flue gas inlet of the adsorption tower, and the spray cooling tower being used to cool the flue gas to low-temperature flue gas below zero degrees before supplying it to the adsorption tower. The high-temperature flue gas discharged from the boiler enters the spray cooling tower through the smoke inlet, and is converted into low-temperature flue gas after being spray-cooled in the spray cooling tower. The low-temperature flue gas is discharged from the spray cooling tower from the smoke outlet and enters the adsorption tower through the smoke inlet for low-temperature adsorption. Cooling the flue gas by setting up a spray cooling tower is beneficial to improving the cooling efficiency of the flue gas.

[0016] In some embodiments, the temperature of the cooling gas is between -15°C and -10°C. It is understood that the cooling efficiency of the cooling gas is positively correlated with its temperature; that is, the lower the cooling gas temperature, the higher the cooling efficiency. However, setting the cooling gas temperature too low will result in higher costs for producing cooling gas at a lower temperature. Therefore, the cooling gas temperature can be reasonably set based on cooling efficiency requirements, taking into account both cooling efficiency and cost of the adsorbent.

[0017] In some embodiments, the demister is a packing layer, and some dehumidification medium is filled in the packing layer, so that the demister has a simple structure and is easy to process and manufacture.

[0018] In some embodiments, the condenser tube extends vertically, and the central axis of the condenser tube coincides with the central longitudinal axis of the tank body. Water vapor in the regenerated rich gas condenses into water droplets, which quickly fall into the liquid collection chamber through the hollow portion of the condenser tube. This avoids the problem of first contacting the inner wall of the condenser tube before sliding down into the liquid collection chamber, resulting in a long falling time. This reduces the contact time between the condensed water droplets and the regenerated rich gas, thereby improving the primary dehumidification efficiency of the regenerated rich gas.

[0019] In addition, the central axis of the condenser coincides with the central longitudinal axis of the tank body, so that the annular space formed between the condenser and the tank body is distributed more evenly in the radial direction of the tank body, so that the regenerated rich gas after the first dehumidification can be evenly passed through the demister for a second dehumidification, preventing the regenerated rich gas from being locally accumulated in the annular cavity and causing the demister to perform incomplete secondary dehumidification of the regenerated rich gas, which is beneficial to improving the reliability of the secondary dehumidification work of the demister.

[0020] In some embodiments, the liquid collecting chamber includes a straight chamber section and an inverted cone chamber section connected to the lower end of the straight chamber section, the solid phase outlet is provided at the bottom end of the inverted cone chamber section, and the liquid phase outlet is provided on the straight chamber section. The regeneration rich gas processing device of the low-temperature adsorption regeneration system of the embodiment of the present application is configured to have a liquid collecting chamber as a straight chamber section and an inverted cone chamber section, so that the adsorbent particles in the regeneration rich gas can fall through the straight chamber section into the inverted cone chamber section, and slide to the bottom of the inverted cone chamber section by utilizing the inclined inner wall surface of the inverted cone chamber section, thereby facilitating the collection of the adsorbent solid particles for easy discharge from the solid phase outlet.

[0021] In some embodiments, the liquid phase outlet is connected to a drainage pipe, which includes a first straight pipe section connected to the liquid phase outlet, a second straight pipe section and a curved pipe section connected between the first straight pipe section and the second straight pipe section. The curved pipe section bends downward to form a water seal to prevent the regenerated rich gas in the liquid collecting chamber from being discharged through the drainage pipe when the water in the liquid collecting chamber is lower than the liquid phase outlet, thereby polluting the environment. This makes the low-temperature adsorption regeneration system of the embodiment of the present application more environmentally friendly.

[0022] In some embodiments, the curved pipe section is U-shaped, which makes the drainage pipe structure simple and easy to process and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a regeneration rich gas treatment device of a low-temperature adsorption regeneration system according to an embodiment of the present application.

[0024] FIG2 is a schematic diagram of the structure of the adsorbent according to an embodiment of the present application.

[0025] Reference numerals: Regeneration rich gas treatment device 100; tank body 1; exhaust chamber 101, gas phase outlet 1011; liquid collecting chamber 102; liquid phase outlet 1021; solid phase outlet 1022; straight chamber section 1023; inverted cone chamber section 1024; demister 2; condenser 3; drain pipe 4; first straight pipe section 401; second straight pipe section 402; curved pipe section 403. DETAILED DESCRIPTION

[0026] The embodiments of the present application 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 application, but should not be understood as limiting the present application.

[0027] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0028] As shown in Figure 1, the low-temperature adsorption regeneration system of an embodiment of the present application includes an adsorption tower (not shown in the figure), a regeneration tower (not shown in the figure), and a regeneration rich gas treatment device 100. The adsorption tower has a flue gas inlet and a clean flue gas outlet. The adsorption tower contains adsorbent for low-temperature adsorption and purification of flue gas into low-temperature clean flue gas. The regeneration tower is used to regenerate and desorb the adsorbent that has been saturated with adsorption in the adsorption tower. The regeneration tower has a regeneration rich gas outlet for discharging regeneration rich gas. The regeneration rich gas treatment device 100 is connected to the regeneration rich gas outlet of the regeneration tower and is used to separate water vapor and solid particles in the regeneration rich gas.

[0029] During use of the low-temperature adsorption regeneration system of the present embodiment, high-temperature flue gas generated by the boiler enters the adsorption tower through the flue gas inlet. The adsorbent in the adsorption tower purifies the incoming flue gas through low-temperature adsorption, and then exits the adsorption tower through the clean flue gas outlet for recycling. The saturated adsorbent is transported to the regeneration tower for heating and desorption regeneration. The regeneration-rich gas generated by desorption in the regeneration tower exits the regeneration tower through the regeneration-rich gas outlet. The regeneration-rich gas discharged from the regeneration tower enters the regeneration-rich gas treatment device 100, where water vapor and solid particles in the regeneration-rich gas are separated.

[0030] The regeneration rich gas treatment device 100 separates the water vapor in the regeneration rich gas, thereby greatly reducing the water vapor content in the regeneration rich gas, and can effectively reduce or even prevent the sulfides and nitrogen oxides in the regeneration rich gas from combining with water vapor to generate corrosive acidic liquids, which corrode the regeneration rich gas transmission pipeline and equipment, thereby reducing the service life of the transmission pipeline and equipment; in addition, the regeneration rich gas treatment device 100 separates the adsorbent solid particles in the regeneration rich gas, which can effectively prevent the adsorbent particles mixed in the regeneration rich gas from being transported through the transmission pipeline for a long time and accumulating in the transmission pipeline to cause blockage of the transmission pipeline.

[0031] Therefore, the low-temperature adsorption regeneration system of the embodiment of the present application can not only increase the service life of the regenerated rich gas transmission pipeline and the transmission equipment, but also avoid blockage of the transmission pipeline.

[0032] In the embodiments of the present application, the adsorbent can be a granular or powdered adsorbent, or an adsorbent body made of powder or granular adsorbent, such as a sphere or cylinder formed by a powder or granular adsorbent through a binder. Of course, a protective shell can be further formed on the outside of the adsorbent body, such as a breathable film covering the outside of the adsorbent body, to improve the strength of the adsorbent body.

[0033] As shown in Figure 2, the adsorbent can be filled within a breathable housing 5 to form an adsorption unit. The breathable housing 5 has air holes through which flue gas can enter the housing 5. Flue gas can then pass through the gaps between adjacent adsorbents and / or the pores within the adsorbents themselves, thereby reducing direct collisions, friction, and wear between adsorbents, as well as dust generation. The breathable housing 5 can be in the shape of a spherical, cylindrical, or other rotating body. The diameter of the breathable housing 5 is 10 mm to 100 mm, and the diameter of the adsorbent is 1 mm to 10 mm.

[0034] In some embodiments, the regeneration rich gas processing device 100 includes a tank body 1, a demister 2, and a condenser 3. The demister 2 is disposed within the tank body 1 to separate the inner cavity of the tank body 1 into an exhaust chamber 101 and a liquid collecting chamber 102 located below the exhaust chamber 101. The exhaust chamber 101 has a gas phase outlet 1011, and the liquid collecting chamber 102 has a liquid phase outlet 1021 and a solid phase outlet 1022. The condenser 3 has an inlet end and an outlet end. The inlet end of the condenser 3 is connected to the regeneration rich gas outlet of the regeneration tower, and the outlet end of the condenser 3 passes through the exhaust chamber 101 and the demister 2 and extends into the liquid collecting chamber 102. The condenser 3 is used to pass the regeneration rich gas and sub-zero cooling gas into the liquid collecting chamber 102.

[0035] For example, as shown in Figure 1, during use, the regeneration rich gas processing device 100 of the low-temperature adsorption regeneration system of the embodiment of the present application passes the regeneration rich gas and the cooling gas into the inlet end of the condenser 3, and the regeneration rich gas and the cooling gas are mixed and heat exchanged in the condenser 3, and the temperature of the regeneration rich gas drops rapidly. The water vapor in the regeneration rich gas condenses into water droplets in the condenser 3, and falls into the liquid collecting chamber 102 under the action of gravity and is discharged from the liquid collecting chamber 102 through the liquid phase outlet 1021, thereby achieving a one-time dehumidification of the regeneration rich gas. At the same time, the adsorbent particles contained in the regeneration rich gas will also fall into the water in the liquid collecting chamber 102 under the action of gravity, sink to the bottom of the liquid collecting chamber 102, and be discharged from the liquid collecting chamber 102 through the solid phase outlet 1022, thereby achieving a one-time dehumidification of the regeneration rich gas and separation of the adsorbent solid particles. The regenerated rich gas after the first dehumidification flows upward through the demister 2 and back into the exhaust chamber 101, so that the demister 2 performs a second dehumidification on the regenerated rich gas after the first dehumidification, further reducing the water vapor content in the regenerated rich gas. The water vapor content in the regenerated rich gas after the second dehumidification has been greatly reduced, and after entering the exhaust chamber 101, it is discharged through the gas phase outlet 1011.

[0036] Therefore, the regeneration rich gas treatment device 100 of the low-temperature adsorption regeneration system of the embodiment of the present application can perform secondary dehumidification and separation of water vapor in the regeneration rich gas and separate the solid adsorbent particles, so that the regeneration rich gas treatment device 100 has a simple structure and low manufacturing cost.

[0037] In some embodiments, the clean flue gas outlet of the adsorption tower is connected to the inlet end of the condenser 3 of the regeneration rich gas treatment device 100 so that the low-temperature clean flue gas discharged from the clean flue gas outlet of the adsorption tower is used as cooling gas.

[0038] The low-temperature adsorption regeneration system of the embodiment of the present application utilizes the low-temperature clean flue gas generated after the low-temperature adsorption of flue gas in the adsorption tower as cooling gas and passes it into the condenser 3 to cool the regenerated rich gas, thereby fully utilizing the energy of the clean flue gas. There is no need to set up a separate cooling medium to cool the regenerated rich gas, which is beneficial to saving the manufacturing of cooling medium and thus saving costs.

[0039] In some embodiments, the outer diameter of the condenser tube 3 is d, and the inner diameter of the tank body 1 is D, where 1 / 3 ≤ d / D ≤ 2 / 3. A demister 2 is provided so that there is sufficient space between the outer wall of the condenser tube 3 and the inner wall of the tank body 1 to increase the flow cross-sectional area of ​​the demister 2, thereby improving the secondary dehumidification effect of the regenerated rich gas.

[0040] In some embodiments, the low-temperature adsorption regeneration system of the embodiment of the present application also includes a spray cooling tower (not shown in the figure), the spray cooling tower has a smoke inlet for supplying flue gas into the spray cooling tower and a smoke outlet for discharging the cooled flue gas, the smoke outlet is connected to the flue gas inlet of the adsorption tower, and the spray cooling tower is used to cool the flue gas to low-temperature flue gas below zero degrees and then supply it to the adsorption tower.

[0041] In some embodiments, the high-temperature flue gas discharged from the boiler enters the spray cooling tower through the smoke inlet, and is turned into low-temperature flue gas after being spray-cooled in the spray cooling tower. The low-temperature flue gas is discharged from the spray cooling tower from the smoke outlet and enters the adsorption tower through the smoke inlet for low-temperature adsorption. Cooling the flue gas by setting up a spray cooling tower is beneficial to improving the cooling efficiency of the flue gas.

[0042] In the embodiments of the present application, the low-temperature flue gas is flue gas below zero degrees, so that the adsorbent performs low-temperature adsorption on the flue gas, thereby improving the adsorption effect and achieving near-zero emissions. In some embodiments, the temperature of the low-temperature flue gas is below zero, for example, -80°C to -5°C. In some further 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, the cooling equipment, adsorption tower and pipeline sealing requirements are high, which will lead to increased costs. In addition, excessively low temperature conditions will easily lead to condensation water in the adsorption chamber, 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.

[0043] In some embodiments, the temperature of the cooling gas is -15°C to -10°C.

[0044] For example, the cooling gas temperature is -12°C. It is understood that the cooling efficiency of the cooling gas is positively correlated with its temperature; that is, the lower the cooling gas temperature, the higher the cooling efficiency. However, setting the cooling gas temperature too low will result in higher costs for producing cooling gas at a lower temperature. Therefore, the cooling gas temperature can be reasonably set based on the cooling efficiency requirements, balancing the cooling efficiency and cost of the adsorbent.

[0045] In some embodiments, the demister 2 is a packing layer, and some dehumidification medium is filled in the packing layer, so that the demister 2 has a simple structure and is easy to process and manufacture.

[0046] In some embodiments, the condenser tube 3 extends in a vertical direction, and the central axis of the condenser tube 3 coincides with the central longitudinal axis of the tank body 1 .

[0047] The regeneration rich gas treatment device 100 of the low-temperature adsorption regeneration system of the embodiment of the present application extends the condenser tube 3 in the vertical direction. Based on the condensation of water vapor in the regeneration rich gas into water droplets, the water droplets can quickly fall into the liquid collecting chamber 102 in the hollow part of the condenser tube 3, so as to avoid the problem of first contacting the inner wall of the condenser tube 3 and then sliding down to the liquid collecting chamber 102, resulting in a long falling time, thereby reducing the contact time between the condensed water droplets and the regeneration rich gas, which is beneficial to improving the one-time dehumidification efficiency of the regeneration rich gas.

[0048] In addition, the central axis of the condenser 3 coincides with the central longitudinal axis of the tank body 1, so that the annular space formed between the condenser 3 and the tank body 1 is distributed more evenly in the radial direction of the tank body 1, so that the regenerated rich gas after the first dehumidification can be evenly passed through the demister 2 for a second dehumidification, preventing the regenerated rich gas from being locally accumulated in the annular cavity and causing the demister 2 to perform incomplete secondary dehumidification of the regenerated rich gas, which is beneficial to improving the reliability of the secondary dehumidification work of the demister 2.

[0049] In some embodiments, the demister 2 is an annular demister 2, the central axis of the annular demister 2 coincides with the central longitudinal axis of the tank body 1, and a through-hole for the condenser tube 3 to pass through is provided in the center of the annular demister 2. The condenser tube 3 passes through the through-hole on the demister 2. The outer peripheral surface of the demister 2 is sealedly connected to the inner wall surface of the tank body 1, and the outer wall surface of the condenser tube 3 is sealedly matched with the through-hole on the demister 2 to prevent the regenerated rich gas from flowing into the exhaust chamber 101 through the assembly gap between the condenser tube 3 and the demister 2 and the assembly gap between the demister 2 and the inner wall surface of the tank body 1, resulting in incomplete dehumidification of the regenerated rich gas.

[0050] In some embodiments, the liquid collecting chamber 102 includes a straight chamber section 1023 and an inverted cone chamber section 1024 connected to the lower end of the straight chamber section 1023 , the solid phase outlet 1022 is arranged at the bottom end of the inverted cone chamber section 1024 , and the liquid phase outlet 1021 is arranged on the straight chamber section 1023 .

[0051] For example, as shown in Figure 1, the regeneration rich gas processing device 100 of the low-temperature adsorption regeneration system of the embodiment of the present application sets the liquid collecting chamber 102 as a straight chamber section 1023 and an inverted cone chamber section 1024, so that the adsorbent particles in the regenerated rich gas fall into the inverted cone chamber section 1024 through the straight chamber section 1023, and slide to the bottom of the inverted cone chamber section 1024 using the inclined inner wall surface of the inverted cone chamber section 1024, thereby facilitating the collection of the adsorbent solid particles for discharge from the solid phase outlet 1022.

[0052] In some embodiments, the liquid phase outlet 1021 is connected to a drainage pipe 4, which includes a first straight pipe section 401 connected to the liquid phase outlet 1021, a second straight pipe section 402, and a curved pipe section 403 connected between the first straight pipe section 401 and the second straight pipe section 402. The curved pipe section 403 bends downward to form a water seal. This prevents the regenerated rich gas in the liquid collecting chamber 102 from being discharged through the drainage pipe 4 when the water level in the liquid collecting chamber 102 drops below the liquid phase outlet 1021, thereby polluting the environment. This makes the low-temperature adsorption regeneration system of the present embodiment more environmentally friendly.

[0053] In some embodiments, as shown in FIG. 1 , the curved pipe section 403 is U-shaped, and its opening is upwardly facing, so that the drainage pipe 4 has a simple structure and is easy to manufacture.

[0054] In the description of the present application, 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 application 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 on the present application.

[0055] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0056] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] In this application, 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.

[0058] In this application, 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 application. In this specification, the schematic representations 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 the features of different embodiments or examples without contradiction.

[0059] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present application.

Claims

1. A low-temperature adsorption regeneration system, wherein, Comprising: An adsorption tower having a flue gas inlet and a clean flue gas outlet, and an adsorbent therein for low-temperature adsorption and purification of flue gas into low-temperature clean flue gas; And A regeneration tower for desorbing and regenerating the adsorbent saturated in the adsorption tower, the regeneration tower having a regenerated rich gas outlet for discharging regenerated rich gas; And A regenerated rich gas treatment device communicating with the regenerated rich gas outlet of the regeneration tower for separating water vapor and solid particles in the regenerated rich gas.

2. The low-temperature adsorption regeneration system according to claim 1, wherein The regenerated rich gas treatment device includes: A tank body; A demister provided in the tank body to divide the inner cavity of the tank body into an exhaust chamber and a liquid collection chamber below the exhaust chamber, the exhaust chamber having a gas phase outlet, and the liquid collection chamber having a liquid phase outlet and a solid phase outlet; A condensing pipe having an inlet end and an outlet end, the inlet end of the condensing pipe communicating with the regenerated rich gas outlet of the regeneration tower, and the outlet end of the condensing pipe passing through the exhaust chamber and the demister and extending into the liquid collection chamber, the condensing pipe being configured to introduce regenerated rich gas and cooling gas below zero degree Celsius into the liquid collection chamber.

3. The cryogenic adsorption regeneration system according to claim 2, wherein The clean flue gas outlet of the adsorption tower is connected to the inlet end of the condensing pipe so that the low-temperature clean flue gas discharged from the clean flue gas outlet of the adsorption tower is used as the cooling gas.

4. The cryogenic adsorption regeneration system according to claim 3, wherein, Further comprising a spray cooling tower having a flue gas inlet for supplying flue gas into the spray cooling tower and a flue gas outlet for discharging the cooled flue gas, the flue gas outlet being connected to the flue gas inlet of the adsorption tower, the spray cooling tower being configured to cool the flue gas to a low-temperature flue gas below zero degree Celsius and supply it into the adsorption tower.

5. The cryogenic adsorption regeneration system according to claim 2, wherein, The temperature of the cooling gas is -15°C to -10°C.

6. The cryogenic adsorption regeneration system according to claim 2, wherein, The demister is a packing layer.

7. The cryogenic adsorption regeneration system according to claim 2, wherein The condensing pipe extends in the vertical direction, and the central axis of the condensing pipe coincides with the central longitudinal axis of the tank body.

8. The cryogenic adsorption regeneration system according to claim 2, wherein, The liquid collection chamber includes a straight chamber section and an inverted cone chamber section connected to the lower end of the straight chamber section, the solid phase outlet is provided at the bottom end of the inverted cone chamber section, and the liquid phase outlet is provided on the straight chamber section.

9. The cryogenic adsorption regeneration system according to claim 2, wherein, The liquid phase outlet is communicated with a liquid discharge pipeline, the liquid discharge pipeline includes a first straight pipe section connected to the liquid phase outlet, a second straight pipe section, and a bent pipe section connected between the first straight pipe section and the second straight pipe section, and the bent pipe section is bent downward to form a water seal.

10. The cryogenic adsorption regeneration system according to claim 9, wherein, The bent pipe section is U-shaped.

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