Multifunctional flue-gas purification device and control method therefor

Abstract

A multifunctional flue-gas purification device and a control method therefor. The multifunctional flue-gas purification device comprises an adsorption regenerator (1) and a heat exchange medium supply assembly (2), wherein the adsorption regenerator (1) comprises a housing (11), an adsorbent layer (12) arranged in the housing (11) and a heat exchanger (13) arranged in the housing (11) and used for exchanging heat with the adsorbent layer (12); the adsorption regenerator (1) has a pre-cooling mode, an adsorption mode and a regeneration mode; the heat exchange medium supply assembly (2) is connected to the heat exchanger (13) and is used for supplying heat exchange media to the heat exchanger (13); and the heat exchange medium supply assembly (2) introduces heat exchange media of different temperatures into the heat exchanger (13), such that the adsorption regenerator (1) maintains different operation modes.

Description

Multifunctional flue gas purification device and control method thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023114240917 filed in China on October 30, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of flue gas adsorption purification, and in particular to a multifunctional flue gas purification device and a control method thereof. Background Art

[0004] The large-scale emission of atmospheric pollutants such as SO2 and NO from coal-fired flue gas is the primary cause of air pollution. Among the relevant technologies, standalone desulfurization and denitrification technologies are relatively mature. Desulfurization technologies are mainly classified by desulfurizer into wet, dry, and semi-dry methods. Dry desulfurizers are mainly activated carbon (coke), and activated carbon (coke) purification materials have obvious advantages in dry desulfurization and denitrification of industrial flue gas. However, the use of activated carbon desulfurization technology to treat flue gas has low adsorption and purification efficiency and poor results during the desulfurization process, and requires a large amount of adsorbent.

[0005] Summary of the Invention

[0006] The present disclosure is based on the inventors' findings and understanding of the following facts and problems:

[0007] In related technologies, activated coke desulfurization processes operate at relatively high temperatures, typically around 100°C. This results in low adsorption capacity for the adsorbent, leading to large adsorbent usage and bulky adsorption towers. Furthermore, the adsorption and removal of pollutants releases significant heat, impacting the adsorption efficiency of the adsorbent.

[0008] The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art. To this end, a first embodiment of the present disclosure provides a multifunctional flue gas purification device, which has the characteristics of high adsorption efficiency, good purification effect, small size, high safety and low energy consumption.

[0009] A second embodiment of the present disclosure provides a control method for a multifunctional flue gas purification device.

[0010] The multifunctional flue gas purification device according to the first embodiment of the present disclosure includes:

[0011] an adsorption regenerator, the adsorption regenerator comprising a shell, an adsorbent layer disposed in the shell, and a heat exchanger disposed in the shell for exchanging heat with the adsorbent layer; and

[0012] A heat exchange medium supply component is connected to the heat exchanger and is used to supply heat exchange medium to the heat exchanger. The adsorption regenerator has a pre-cooling mode, an adsorption mode and a regeneration mode. In the pre-cooling mode, the heat exchange medium supply component supplies heat exchange medium of a first temperature to the heat exchanger to pre-cool the adsorbent layer. In the adsorption mode, the heat exchange medium supply component supplies heat exchange medium of a second temperature to the heat exchanger to cool the flue gas and the adsorbent layer, and the adsorbent layer performs low-temperature adsorption purification on the flue gas in the sub-zero temperature zone. In the regeneration mode, the heat exchange medium supply component supplies heat exchange medium of a third temperature to the heat exchanger to heat the adsorbent layer to desorb and regenerate the adsorbent, wherein the first temperature is greater than or equal to the second temperature, and the third temperature is greater than the first temperature.

[0013] The multifunctional flue gas purification device of the disclosed embodiment, in adsorption mode, introduces low-temperature air into the heat exchanger to simultaneously cool the flue gas and the adsorbent layer in the adsorption regenerator, thereby maintaining the flue gas and the adsorbent layer in the sub-zero temperature range. The adsorbent layer performs low-temperature adsorption of pollutants in the flue gas in the sub-zero temperature range, increasing the adsorption capacity of the adsorbent, thereby reducing the amount of adsorbent loaded in the adsorption regenerator, reducing the volume of the adsorption regenerator, reducing the initial construction cost, and improving the adsorption purification effect. In addition, the heat exchange medium is continuously introduced to promptly remove the heat released during the flue gas adsorption purification process, thereby avoiding the problem of the adsorbent layer temperature rising and causing the adsorbent adsorption efficiency to decrease.

[0014] The multifunctional flue gas purification device of the disclosed embodiment introduces hot air into the heat exchanger in the regeneration mode to indirectly exchange heat with the adsorbent to desorb and regenerate the adsorbent. Moreover, due to the indirect heat exchange, direct heating of the adsorbent is avoided, which may cause excessive temperature and combustion, thereby improving the safety of the device.

[0015] In the pre-cooling mode of the multifunctional flue gas purification device of the disclosed embodiment, ambient temperature air is introduced into the heat exchanger to pre-cool the regenerated adsorbent before proceeding to the subsequent adsorption mode. Compared to directly entering the adsorption mode after the regeneration mode, the addition of the pre-cooling mode between the two modes allows for gradient cooling, which can reduce the overall energy consumption of the adsorption regenerator during the flue gas purification process.

[0016] In some embodiments, the heat exchange medium is air, water or refrigerant.

[0017] In some embodiments, the heat exchange medium supply assembly includes an air pump, a refrigerator and a heater respectively connected to the heat exchanger. In the pre-cooling mode, the air pump passes normal temperature air of 10°C to 30°C into the heat exchanger. In the adsorption mode, the refrigerator passes low-temperature air of -20°C to -10°C into the heat exchanger. In the regeneration mode, the heater passes hot air of 200°C to 400°C into the heat exchanger.

[0018] In some embodiments, the multifunctional flue gas purification device also includes a medium switching component, which is connected to the heat exchange medium supply component and the heat exchanger to control the heat exchange medium supply component to pass heat exchange medium with a temperature corresponding to the mode of the adsorption regenerator into the heat exchanger.

[0019] In some embodiments, the first medium source is air at room temperature, the second medium source is low-temperature air cooled by a refrigerator, and the third medium source is hot air heated by a heater.

[0020] In some embodiments, the heat exchanger is a serpentine, spiral or vortex-shaped heat exchange tube.

[0021] In some embodiments, a first partition and a second partition are provided in the shell to define a smoke inlet space, an adsorption space and a smoke exhaust space that are connected in sequence in the shell. The smoke inlet space is connected to the smoke inlet of the adsorption regenerator, the adsorption space is filled with adsorbent to form the adsorbent layer, and the smoke exhaust space is connected to the smoke outlet of the adsorption regenerator.

[0022] In some embodiments, the housing is a vertical oblong container, and the first partition and the second partition are vertically spaced apart.

[0023] In some embodiments, the smoke inlet of the adsorption regenerator is located at the bottom of the shell, and the smoke outlet of the adsorption regenerator is located at the top of the shell.

[0024] A control method for a multifunctional flue gas purification device according to a second aspect of the present disclosure, wherein the multifunctional flue gas purification device includes an adsorption regenerator, the adsorption regenerator including a housing, an adsorbent layer disposed within the housing, and a heat exchanger disposed within the housing, the control method comprising:

[0025] The adsorption regenerator is operated in a pre-cooling mode: a heat exchange medium at a first temperature is introduced into the heat exchanger to pre-cool the adsorbent layer;

[0026] The adsorption regenerator is operated in an adsorption mode: flue gas is introduced into the housing and a heat exchange medium at a second temperature is introduced into the heat exchanger, so that the adsorbent layer performs low-temperature adsorption purification on the flue gas in a sub-zero temperature range;

[0027] The adsorption regenerator is operated in a regeneration mode: the introduction of flue gas into the shell is stopped, and a heat exchange medium at a third temperature is introduced into the heat exchanger to desorb and regenerate the adsorbent layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of a multifunctional flue gas purification device according to an embodiment of the present disclosure.

[0029] FIG2 is a schematic diagram of an adsorption unit of a multifunctional flue gas purification device according to an embodiment of the present disclosure.

[0030] Figure numerals: adsorption regenerator 1, shell 11, adsorbent layer 12, adsorption unit 121, breathable shell 1211, adsorbent particles 1212, heat exchanger 13, heat exchange tube 131, first partition 14, second partition 15, smoke inlet 101, smoke outlet 102, heat exchange medium supply component 2, air pump 21, refrigerator 22, heater 23, medium switching component 3. DETAILED DESCRIPTION

[0031] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

[0032] The multifunctional flue gas purification device of the embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0033] As shown in FIG1 , the multifunctional flue gas purification device of the embodiment of the present disclosure includes: an adsorption regenerator 1 and a heat exchange medium supply assembly 2 .

[0034] The adsorption regenerator 1 includes a housing 11, an adsorbent layer 12, and a heat exchanger 13. The adsorbent layer 12 is disposed within the housing 11 and is used to adsorb and purify the flue gas entering the housing 11. The heat exchanger 13 is disposed within the housing 11 and is used to indirectly exchange heat with the adsorbent layer 12.

[0035] In the embodiment of the present disclosure, the adsorbent layer 12 is formed by stacking adsorbents, and the adsorbents can be filled in a breathable shell 1211 to form an adsorption unit 121. That is, as shown in FIG2 , the adsorption unit 121 includes a breathable shell 1211 and an adsorbent filled in the breathable shell 1211. The adsorbent can be a granular or powdered adsorbent, or an adsorbent body made of a powdered or granular adsorbent, such as a spherical body or a cylindrical body formed by a powdered or granular adsorbent with a binder. Of course, a protective shell can be further formed outside the adsorbent body, such as a breathable membrane covering the outside of the adsorbent body, to further improve the strength of the adsorbent body.

[0036] The breathable housing 1211 has air holes through which smoke can enter the breathable housing 1211. The smoke 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 the generation of dust. The breathable housing 1211 can be in the shape of a rotating body, such as a sphere or cylinder. In some embodiments, the adsorption unit 121 has a diameter of 10 mm to 100 mm, and the adsorbent particles 1212 have a diameter of 1 mm to 10 mm.

[0037] By placing the adsorbent in the breathable shell 1211 to form the adsorption unit 121, on the one hand, the dust generated by the collision between the adsorbents can be reduced; on the other hand, it is beneficial to increase the contact area between the flue gas and the adsorbent and improve the air permeability of the adsorbent, which is particularly beneficial for low-temperature adsorption.

[0038] The heat exchange medium supply assembly 2 is connected to the heat exchanger 13 and is used to supply heat exchange medium to the heat exchanger 13. The adsorption regenerator 1 has a pre-cooling mode, an adsorption mode and a regeneration mode. In the pre-cooling mode, the heat exchange medium supply assembly 2 supplies a heat exchange medium of a first temperature to the heat exchanger 13 to pre-cool the adsorbent layer 12. In the adsorption mode, the heat exchange medium supply assembly 2 supplies a heat exchange medium of a second temperature to the heat exchanger 13 to cool the flue gas and the adsorbent layer 12, and the adsorbent layer 12 performs low-temperature adsorption purification on the flue gas in the sub-zero temperature zone. In the regeneration mode, the heat exchange medium supply assembly 2 supplies a heat exchange medium of a third temperature to the heat exchanger 13 to heat the adsorbent layer 12 to desorb and regenerate the adsorbent. Among them, the first temperature is greater than or equal to the second temperature, and the third temperature is greater than the first temperature.

[0039] It is understood that during the flue gas purification process, the adsorption regenerator 1 cyclically operates in an adsorption mode, a regeneration mode, and a pre-cooling mode. The heat exchange medium supply assembly 2 passes heat exchange medium of different temperatures into the heat exchanger 13 to maintain the different operating modes of the adsorption regenerator 1. The operating temperature in the adsorption mode is lower than that in the pre-cooling mode, and the operating temperature in the pre-cooling mode is lower than that in the regeneration mode.

[0040] In other words, during the flue gas purification process, the adsorption regenerator 1 operates in an adsorption mode, purifying the incoming flue gas through adsorption. Once the adsorbent is saturated, the adsorption regenerator 1 operates in a regeneration mode, desorbing and regenerating the saturated adsorbent. After the adsorbent desorption and regeneration are complete, the adsorption regenerator 1 operates in a pre-cooling mode, pre-cooling the adsorbent layer 12 heated during the regeneration process. This completes a single cycle of operation of the adsorption regenerator 1.

[0041] In the adsorption mode, the flue gas to be purified is transported from the boiler (for example, in a power plant or steel plant) into the adsorption regenerator 1, and at the same time, the heat exchange medium supply component 2 continuously supplies the heat exchange medium of the second temperature to the heat exchanger 13 to cool the flue gas and the adsorbent layer 12 to the sub-zero temperature zone and keep it in the sub-zero temperature zone at all times.

[0042] It should be understood that the inventors discovered through research that in the low-temperature environment of the sub-zero temperature zone, nitrogen oxides in the flue gas undergo low-temperature oxidation and adsorption on the surface of adsorbents such as activated carbon, oxidizing the difficult-to-adsorb nitric oxide gas into easily adsorbed nitrogen dioxide gas, achieving a hundreds-fold increase in adsorption capacity. In addition, the adsorption capacity of components such as sulfur dioxide, carbon dioxide and heavy metals also increases exponentially in low-temperature environments.

[0043] In some embodiments, the temperature of the low temperature environment is, for example, -80°C to -5°C.

[0044] In some embodiments, the low-temperature environment is between -20°C and -10°C. The inventors have discovered through research that the lower the flue gas temperature, the more beneficial it is for adsorption purification. However, too low a flue gas temperature complicates the structure of the flue gas cooling equipment and increases energy consumption. For example, it requires the purification device 1 and pipelines to be equipped with an insulation layer, requiring high sealing performance, which increases costs. Furthermore, excessively low temperatures can easily lead to condensation within the adsorption regenerator 1, causing adsorbent adhesion and clogging, affecting adsorption. Therefore, it is advantageous to cool the flue gas and adsorbent layer 12 to a temperature between -20°C and -10°C.

[0045] As a result, the adsorbent layer 12 performs low-temperature adsorption of pollutants in the flue gas in the sub-zero temperature range, increasing the adsorption capacity of the adsorbent. This reduces the amount of adsorbent required within the adsorption regenerator 1, reduces the volume of the adsorption regenerator 1, reduces initial construction costs, and improves the adsorption purification effect. Furthermore, the continuous flow of heat exchange medium promptly removes the heat released during the flue gas adsorption process, preventing the temperature of the adsorbent layer 12 from rising, which could lead to a decrease in the adsorption efficiency of the adsorbent.

[0046] In the regeneration mode, the flue gas is stopped from being introduced into the adsorption regenerator 1, and the heat exchange medium of the third temperature is continuously supplied to the heat exchanger 13 through the heat exchange medium supply component 2 to indirectly heat the adsorbent layer 12 to the set temperature, so that the adsorbent is desorbed and regenerated. Moreover, due to the indirect heat exchange, the phenomenon of the adsorbent burning due to excessive temperature during direct heating is avoided, thereby improving the safety of the multifunctional flue gas purification device of the embodiment of the present disclosure.

[0047] In the pre-cooling mode, after the desorption and regeneration of the adsorbent layer 12 is completed, the heat exchange medium of the first temperature is continuously supplied to the heat exchanger 13 through the heat exchange medium supply component 2 to perform preliminary indirect cooling on the adsorbent layer 12 and cool it to room temperature, so as to facilitate the subsequent operation of the adsorption mode of the adsorption regenerator 1.

[0048] It should be understood that compared to directly entering the adsorption mode after the regeneration mode ends, because the ambient temperature is higher than the temperature when the adsorption regenerator 1 is operating in the adsorption mode, directly cooling the regenerated adsorbent layer 12 to the sub-zero temperature range through the heat exchange medium at the second temperature consumes more energy. Therefore, the adsorbent layer 12 is first pre-cooled to room temperature by passing the heat exchange medium at the first temperature, and then cooled to the sub-zero temperature range by the heat exchange medium at the second temperature, thereby reducing overall energy consumption through a stepped cooling method.

[0049] For example, in regeneration mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply assembly 2 to the heat exchanger 13 is 200°C to 400°C. In precooling mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply assembly 2 to the heat exchanger 13 is 10°C to 30°C. In adsorption mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply assembly 2 to the heat exchanger 13 is -20°C to -10°C. That is, the first temperature is 10°C to 30°C, the second temperature is -20°C to -10°C, and the third temperature is 200°C to 400°C.

[0050] In some embodiments, the heat exchange medium provided by the heat exchange medium supply assembly 2 is air, water, or refrigerant.

[0051] For example, if the heat exchange medium is air. In adsorption mode, the heat exchange medium supply component 2 delivers low-temperature air of -20°C to -10°C to the heat exchanger 13. In regeneration mode, the heat exchange medium supply component 2 delivers hot air of 200°C to 400°C to the heat exchanger 13. In pre-cooling mode, the heat exchange medium supply component 2 delivers normal temperature air of 10°C to 30°C to the heat exchanger 13. Since the cost of air is relatively low, air can be directly captured from the atmosphere and is easily obtained. Therefore, the use of air as the heat exchange medium can improve the economy of the multifunctional flue gas purification device of the embodiment of the present disclosure.

[0052] In some embodiments, as shown in FIG1 , the heat exchange medium supply assembly 2 includes an air pump 21, a refrigerator 22, and a heater 23. The air pump 21, refrigerator 22, and heater 23 are respectively connected to the heat exchanger 13 via pipelines to supply heat exchange medium of different temperatures to the heat exchanger 13.

[0053] In pre-cooling mode, the air pump 21 supplies room temperature air (10°C to 30°C) to the heat exchanger 13. In adsorption mode, the refrigerator 22 supplies low temperature air (-20°C to -10°C) to the heat exchanger 13. In regeneration mode, the heater 23 supplies hot air (200°C to 400°C) to the heat exchanger 13.

[0054] In other words, in adsorption mode, air indirectly exchanges heat with the refrigerant in the refrigerator 22 to produce low-temperature air at -20°C to -10°C, which is then delivered to the heat exchanger 13 to indirectly cool the flue gas and adsorbent layer 12 to subzero temperatures. In regeneration mode, the heater 23 heats the air to generate hot air at 200°C to 400°C, which is then delivered to the heat exchanger 13 to indirectly heat the adsorbent layer 12. In precooling mode, the air pump 21 directly draws ambient air at 10°C to 30°C from the atmosphere and delivers it to the heat exchanger 13 to precool the regenerated adsorbent layer 12.

[0055] In some embodiments, a first separator 14 and a second separator 15 are provided in the housing 11 to define an adsorption space in the housing 11 . The adsorption space is filled with an adsorbent to form an adsorbent layer 12 .

[0056] That is, the adsorption regenerator 1 of the multifunctional flue gas purification device of the embodiment of the present disclosure is a fixed bed adsorber to perform adsorption, regeneration and pre-cooling rotation operations, avoiding the problems of adsorbent movement wear, material blockage and poor air tightness caused by the moving bed adsorber.

[0057] In some embodiments, the shell 11 is arranged horizontally, and the first partition 14 and the second partition 15 are arranged vertically in the shell 11 to divide the internal space of the shell 11 horizontally into a smoke intake space, an adsorption space and a smoke exhaust space that are connected in sequence. The smoke inlet 101 of the shell 11 is connected to the smoke intake space, and the smoke outlet 102 of the shell 11 is connected to the smoke exhaust space.

[0058] In other embodiments, the shell 11 is vertically arranged, and the first partition 14 and the second partition 15 are arranged horizontally in the shell 11 to divide the internal space of the shell 11 into a smoke intake space, an adsorption space and a smoke exhaust space that are connected in sequence along the vertical direction. The smoke inlet 101 of the shell 11 is connected to the smoke intake space, and the smoke outlet 102 of the shell 11 is connected to the smoke exhaust space.

[0059] Specifically, as shown in Figure 1, the housing 11 is a vertical oblong container. A first partition 14 and a second partition 15 are arranged horizontally and in close contact with the inner wall of the housing 11. The first partition 14 and the second partition 15 are spaced apart vertically. The space defined between the first partition 14 and the second partition 15 is the adsorption space. Below the first partition 14 is the smoke intake space, and above the second partition 15 is the smoke exhaust space. The smoke inlet 101 of the adsorption regenerator 1 is located at the bottom of the housing 11 and communicates with the smoke intake space. The smoke outlet 102 of the adsorption regenerator 1 is located at the top of the housing 11 and communicates with the smoke exhaust space.

[0060] It should be understood that in the adsorption mode, the flue gas to be purified enters the smoke inlet space through the smoke inlet 101, flows upward into the adsorption space for adsorption purification, and the clean flue gas produced by purification flows upward into the smoke exhaust space and is discharged from the smoke exhaust port 102. In the regeneration mode, the regeneration gas produced by desorption and regeneration of the adsorbent is discharged through the regeneration gas outlet (not shown) of the housing 11.

[0061] In some embodiments, a plurality of smoke holes are respectively formed on the first partition 14 and the second partition 15 . The size of the smoke holes is smaller than the size of the adsorbent particles in the adsorption space to prevent the adsorbent from falling.

[0062] In some embodiments, the heat exchanger 13 is a serpentine, spiral or vortex-shaped heat exchange tube 131, the inlet of the heat exchange tube 131 is connected to the heat exchange medium outlet of the heat exchange medium supply component 2, and the outlet of the heat exchange tube 131 is connected to the heat exchange medium inlet of the heat exchange medium supply component 2 to form a heat exchange medium circulation loop.

[0063] In some embodiments, as shown in FIG1 , heat exchange tube 131 is embedded within adsorbent layer 12 and spirally ascends. One inlet end of heat exchange tube 131 penetrates the wall of outer shell 11, such that the inlet of heat exchange tube 131 is located outside of outer shell 11. One outlet end of heat exchange tube 131 penetrates the wall of outer shell 11, such that the outlet of heat exchange tube 131 is located outside of outer shell 11. Furthermore, the inlet of heat exchange tube 131 is adjacent to the bottom of outer shell 11, and the outlet of heat exchange tube 131 is adjacent to the top of outer shell 11.

[0064] In some embodiments, as shown in Figure 1, the multifunctional flue gas purification device of the embodiment of the present disclosure also includes a medium switching component 3, which is connected to the heat exchange medium supply component 2 and the heat exchanger 13 to control the heat exchange medium supply component 2 to pass the heat exchange medium with a temperature corresponding to the mode of the adsorption regenerator 1 into the heat exchanger 13.

[0065] That is, when the adsorption regenerator 1 is in adsorption mode, the medium switching assembly 3 controls the pipeline between the refrigerator 22 and the heat exchanger 13 to be connected, so that the refrigerator 22 can pass low-temperature air to the heat exchanger 13. When the adsorption regenerator 1 is in regeneration mode, the medium switching assembly 3 controls the pipeline between the heater 23 and the heat exchanger 13 to be connected, so that the heater 23 can pass hot air to the heat exchanger 13. When the adsorption regenerator 1 is in pre-cooling mode, the medium switching assembly 3 controls the pipeline between the air pump 21 and the heat exchanger 13 to be connected, so that the air pump 21 can pass normal-temperature air to the heat exchanger 13.

[0066] For example, the medium switching assembly 3 includes a four-way valve having a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is connected to a first medium source (normal temperature air) for providing a heat exchange medium at a first temperature, the second valve port is connected to a second medium source (low temperature air cooled by the refrigerator 22) for providing a heat exchange medium at a second temperature, the third valve port is connected to a third medium source (hot air heated by the heater 23) for providing a heat exchange medium at a third temperature, and the fourth valve port is connected to the inlet of the heat exchanger 13.

[0067] It can be understood that by setting a four-way valve 3 between the air pump 21, the refrigerator 22, the heater 23 and the heat exchanger 13, heat exchange media of different temperatures can enter the heat exchanger 13 through one inlet, thereby reducing the number of inlets of the heat exchanger 13, reducing the layout of the pipelines, and reducing costs.

[0068] Specifically, the outlet of the air pump 21 is connected to the first valve port of the four-way valve 3 via a pipeline, the heat exchange medium outlet of the refrigerator 22 is connected to the second valve port of the four-way valve 3 via a pipeline, the heat exchange medium outlet of the heater 23 is connected to the third valve port of the four-way valve 3 via a pipeline, and the fourth valve port of the four-way valve 3 is connected to the inlet of the heat exchanger 13.

[0069] In some embodiments, the outlet of the heat exchanger 13 is connected to the inlet of the air pump 21, the heat exchange medium inlet of the refrigerator 22, and the heat exchange medium inlet of the heater 23 via pipelines. Similarly, a four-way valve 3 can also be installed on the pipelines between the outlet of the heat exchanger 13 and the inlet of the air pump 21, the heat exchange medium inlet of the refrigerator 22, and the heat exchange medium inlet of the heater 23.

[0070] The following describes a control method for the multifunctional flue gas purification device according to an embodiment of the present disclosure.

[0071] The control method of the multifunctional flue gas purification device of the embodiment of the present disclosure includes an adsorption regenerator 1, the adsorption regenerator 1 includes a housing 11, an adsorbent layer 12 provided in the housing 11, and a heat exchanger 13 provided in the housing 11. The control method includes:

[0072] The adsorption regenerator 1 is operated in a pre-cooling mode: a heat exchange medium at a first temperature (room temperature air of 10° C. to 30° C.) is introduced into the heat exchanger 13 to pre-cool the adsorbent layer 12 .

[0073] The adsorption regenerator 1 operates in adsorption mode: flue gas is introduced into the shell 11 and a heat exchange medium of a second temperature (low-temperature air of -20°C to -10°C) is introduced into the heat exchanger 13, so that the adsorbent layer 12 performs low-temperature adsorption purification on the flue gas in the sub-zero temperature zone.

[0074] The adsorption regenerator 1 is operated in regeneration mode: the flue gas is stopped from entering the shell 11 , and a heat exchange medium of a third temperature (hot air at 200° C. to 400° C.) is introduced into the heat exchanger 13 to desorb and regenerate the adsorbent layer 12 .

[0075] It will be appreciated that during the flue gas purification process, the adsorption regenerator 1 cycles through an adsorption mode, a regeneration mode, and a pre-cooling mode. The adsorption regenerator 1 operates in the adsorption mode to purify the incoming flue gas by adsorption. After the adsorbent is saturated with adsorption, the adsorption regenerator 1 operates in the regeneration mode to desorb and regenerate the saturated adsorbent. After the adsorbent is desorbed and regenerated, the adsorption regenerator 1 operates in the pre-cooling mode to pre-cool the adsorbent layer 12 heated during the regeneration process.

[0076] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0078] In this disclosure, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0079] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0080] In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0081] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present disclosure.

Claims

1. A multifunctional flue gas purification device, characterized in that: include: An adsorption regenerator, the adsorption regenerator comprising a shell, an adsorbent layer disposed in the shell, and a heat exchanger disposed in the shell for exchanging heat with the adsorbent layer; and A heat exchange medium supply component, which is connected to the heat exchanger and is used to supply heat exchange medium to the heat exchanger. The adsorption regenerator has a pre-cooling mode, an adsorption mode and a regeneration mode. In the pre-cooling mode, the heat exchange medium supply component supplies heat exchange medium of a first temperature to the heat exchanger to pre-cool the adsorbent layer. In the adsorption mode, the heat exchange medium supply component supplies heat exchange medium of a second temperature to the heat exchanger to cool the flue gas and the adsorbent layer, and the adsorbent layer performs low-temperature adsorption and purification on the flue gas in the sub-zero temperature zone. In the regeneration mode, the heat exchange medium supply component supplies heat exchange medium of a third temperature to the heat exchanger to heat the adsorbent layer to desorb and regenerate the adsorbent, wherein the first temperature is greater than or equal to the second temperature, and the third temperature is greater than the first temperature.

2. The multifunctional flue gas purification device according to claim 1, characterized in that: The heat exchange medium is air, water or refrigerant.

3. The multifunctional flue gas purification device according to claim 2, characterized in that: The heat exchange medium supply component includes an air pump, a refrigerator and a heater respectively connected to the heat exchanger. In the pre-cooling mode, the air pump passes normal temperature air of 10°C to 30°C to the heat exchanger. In the adsorption mode, the refrigerator passes low-temperature air of -20°C to -10°C to the heat exchanger. In the regeneration mode, the heater passes hot air of 200°C to 400°C to the heat exchanger.

4. The multifunctional flue gas purification device according to any one of claims 1 to 3, characterized in that: It also includes a medium switching component, which is connected to the heat exchange medium supply component and the heat exchanger to control the heat exchange medium supply component to pass heat exchange medium with a temperature corresponding to the mode of the adsorption regenerator to the heat exchanger.

5. The multifunctional flue gas purification device according to any one of claims 1 to 4, characterized in that: The heat exchanger is a serpentine, spiral or vortex shaped heat exchange tube.

6. The multifunctional flue gas purification device according to any one of claims 1 to 5, characterized in that: A first partition and a second partition are provided in the shell to define a smoke inlet space, an adsorption space and a smoke exhaust space which are connected in sequence in the shell. The smoke inlet space is connected to the smoke inlet of the adsorption regenerator. The adsorption space is filled with an adsorbent to form the adsorbent layer. The smoke exhaust space is connected to the smoke outlet of the adsorption regenerator.

7. The multifunctional flue gas purification device according to claim 6, characterized in that: The shell is a vertical oblong container, and the first partition and the second partition are spaced apart in the vertical direction.

8. The multifunctional flue gas purification device according to claim 7, characterized in that: The smoke inlet of the adsorption regenerator is located at the bottom of the shell, and the smoke outlet of the adsorption regenerator is located at the top of the shell.

9. A control method for a multifunctional flue gas purification device, characterized in that: The multifunctional flue gas purification device comprises an adsorption regenerator, the adsorption regenerator comprises a shell, an adsorbent layer arranged in the shell and a heat exchanger arranged in the shell, and the control method comprises: The adsorption regenerator is operated in a precooling mode: a heat exchange medium at a first temperature is introduced into the heat exchanger to precool the adsorbent layer; The adsorption regenerator is operated in an adsorption mode: flue gas is introduced into the shell and a heat exchange medium at a second temperature is introduced into the heat exchanger, so that the adsorbent layer performs low-temperature adsorption purification on the flue gas in a sub-zero temperature range; The adsorption regenerator is operated in a regeneration mode: the introduction of flue gas into the shell is stopped, and a heat exchange medium at a third temperature is introduced into the heat exchanger to desorb and regenerate the adsorbent layer.

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