WO2025092857A1 - Multifunctional flue-gas purification device and control method therefor - Google Patents

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

CROSS-REFERENCE TO RELATED APPLICATIONS

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

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

The large-scale emission of atmospheric pollutants such as SO ₂ and NO in coal-fired flue gas is the primary cause of air pollution. Among the related technologies, the separate desulfurization and denitrification technologies are relatively mature. Desulfurization technologies are mainly classified into wet, dry and semi-dry methods according to the desulfurizer. The dry desulfurizer is mainly based on activated carbon (coke). Activated carbon (coke) purification materials have obvious advantages in dry desulfurization and denitrification of industrial flue gas. However, when using activated coke desulfurization technology to treat flue gas, the efficiency of adsorption purification in the desulfurization process is low, the effect is poor, and the amount of adsorbent used is large.

Summary of the invention

The present disclosure is based on the inventor's discovery and understanding of the following facts and problems:

In the related technology, the operating temperature during the activated coke desulfurization process is relatively high, generally around 100°C, and the adsorption capacity of the adsorbent is low, resulting in the problem of large adsorbent usage and large adsorption tower volume. In addition, the pollutant adsorption and removal process will release a large amount of heat, affecting the adsorption efficiency of the adsorbent.

The present disclosure aims to solve one of the technical problems in the related art to at least some extent. To this end, the first aspect 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.

A second aspect of the present disclosure provides a control method for a multifunctional flue gas purification device.

The multifunctional flue gas purification device of the first embodiment of the present disclosure comprises:

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 is connected to the heat exchanger and is used to supply heat exchange medium to the heat exchanger. The adsorption regenerator has a precooling mode, an adsorption mode and a regeneration mode. In the precooling mode, the heat exchange medium supply component supplies a heat exchange medium at a first temperature to the heat exchanger to precool the adsorbent layer. In the adsorption mode, the heat exchange medium supply component supplies a heat exchange medium at a second temperature to the heat exchanger to cool the adsorbent layer. The flue gas and the adsorbent layer and the adsorbent layer perform low-temperature adsorption purification on the flue gas in a 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.

The multifunctional flue gas purification device of the disclosed embodiment, in the adsorption mode, introduces low-temperature air into the heat exchanger to cool the flue gas and the adsorbent layer in the adsorption regenerator at the same time, so that the flue gas and the adsorbent layer are maintained in the sub-zero temperature zone. The adsorbent layer performs low-temperature adsorption of pollutants in the flue gas in the sub-zero temperature zone, and the adsorption capacity of the adsorbent is increased, thereby reducing the amount of adsorbent 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 take away the heat released in the flue gas adsorption purification process, so as to avoid the problem of the temperature of the adsorbent layer rising, which leads to a decrease in the adsorption efficiency of the adsorbent.

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 to cause combustion due to excessive temperature, thereby improving the safety of the device.

In the precooling mode, the multifunctional flue gas purification device of the disclosed embodiment introduces normal temperature air into the heat exchanger to precool the regenerated adsorbent for the subsequent adsorption mode. Compared with directly entering the adsorption mode after the regeneration mode, by adding the precooling mode between the two, the energy consumption of the adsorption regenerator in the flue gas purification process can be reduced as a whole by gradient cooling.

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

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.

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.

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.

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

In some embodiments, a first partition and a second partition are provided in the outer shell to define a smoke inlet space, an adsorption space and a smoke exhaust space which are connected in sequence in the outer 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, and the smoke exhaust space is connected to the smoke outlet of the adsorption regenerator.

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

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

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 comprises an adsorption regenerator, the adsorption regenerator comprises a housing, an adsorbent layer arranged in the housing, and a heat exchanger arranged in the housing, the control method comprising:

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.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a multifunctional flue gas purification device according to an embodiment of the present disclosure.

FIG. 2 is a schematic diagram of an adsorption unit of the multifunctional flue gas purification device according to an embodiment of the present disclosure.

Reference numerals:
Adsorption regenerator 1, housing 11, adsorbent layer 12, adsorption unit 121, air permeable housing 1211, adsorbent particles 1212,
Heat exchanger 13, heat exchange tube 131, first baffle 14, second baffle 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

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 are intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

The multifunctional flue gas purification device of the embodiment of the present disclosure is described below in conjunction with the accompanying drawings.

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

The adsorption regenerator 1 comprises a housing 11, an adsorbent layer 12 and a heat exchanger 13. The adsorbent layer 12 is arranged in the housing 11, and is used for adsorbing and purifying the flue gas entering the housing 11. The heat exchanger 13 is arranged in the housing 11, and is used for indirect heat exchange with the adsorbent layer 12.

In the embodiment of the present disclosure, the adsorbent layer 12 is formed by stacking adsorbents, and the adsorbents can be filled in the air-permeable shell 1211 to form an adsorption unit 121. That is, as shown in FIG2 , the adsorption unit 121 includes an air-permeable shell 1211 and an adsorbent filled in the air-permeable 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 cylinder formed by a powdered or granular adsorbent through a binder, etc. Of course, a protective shell can be further formed outside the adsorbent body, such as a breathable film covering the outside of the adsorbent body, to further improve the strength of the adsorbent body.

The air-permeable housing 1211 has air holes, through which smoke can enter the air-permeable housing 1211, and smoke can pass through the gaps between adjacent adsorbents and/or the holes of the adsorbents themselves, thereby reducing direct collisions, friction and wear between adsorbents, and the generation of dust. The air-permeable housing 1211 can be in the shape of a rotating body such as a sphere or a cylinder. In some embodiments, the diameter of the adsorption unit 121 is 10 mm-100 mm, and the diameter of the adsorbent particles 1212 is 1 mm-10 mm.

By placing the adsorbent in a breathable shell 1211 to form an adsorption unit 121, on the one hand, the generation of dust caused by collision between 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.

The heat exchange medium supply component 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 precooling mode, an adsorption mode and a regeneration mode. In the precooling mode, the heat exchange medium supply component 2 supplies a heat exchange medium of a first temperature to the heat exchanger 13 to precool the adsorbent layer 12. In the adsorption mode, the heat exchange medium supply component 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 and purification on the flue gas in the sub-zero temperature zone. In the regeneration mode, the heat exchange medium supply component 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.

It can be understood that, during the flue gas purification process, the adsorption regenerator 1 cyclically operates in the adsorption mode, the regeneration mode and the precooling mode, and the heat exchange medium supply component 2 passes heat exchange medium of different temperatures into the heat exchanger 13 to maintain different operation modes of the adsorption regenerator 1. The operation temperature of the adsorption mode is lower than the operation temperature of the precooling mode, and the operation temperature of the precooling mode is lower than the operation temperature of the regeneration mode.

In other words, during the flue gas purification process, 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 precooling mode to precool the adsorbent layer 12 heated during the regeneration process. Thus, a cycle operation of the adsorption regenerator 1 is completed.

In the adsorption mode, the flue gas to be purified, which is transported from a boiler (for example, in a power plant or a steel plant), enters the adsorption regenerator 1, and at the same time, the heat exchange medium supply component 2 continuously transports 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 them in the sub-zero temperature zone at all times.

It should be understood that the inventors have found through research that in the low temperature environment of the sub-zero temperature zone, the nitrogen oxides in the flue gas Low-temperature oxidation adsorption occurs 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 under low-temperature environments.

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

In some embodiments, the temperature of the low temperature environment 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 the energy consumption will increase. For example, the purification device 1 and the pipeline will be required to be provided with an insulation layer, and the sealing requirements will be high, which will increase the cost. In addition, too low temperature conditions will easily cause condensed water to appear in the adsorption regenerator 1, causing the adsorbent to stick and clog, affecting the adsorption. Therefore, it is beneficial to cool the temperature of the flue gas and the adsorbent layer 12 to -20°C to -10°C.

As a result, the adsorbent layer 12 performs low-temperature adsorption of pollutants in the flue gas in the sub-zero temperature zone, and the adsorption capacity of the adsorbent is increased, thereby reducing the amount of adsorbent in the adsorption regenerator 1, reducing the volume of the adsorption regenerator 1, reducing the initial construction cost, and improving the adsorption purification effect. In addition, the heat exchange medium is continuously introduced to take away the heat released during the flue gas adsorption process in a timely manner, thereby avoiding the problem of the temperature of the adsorbent layer 12 rising, which leads to a decrease in the adsorption efficiency of the adsorbent.

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, so as to indirectly heat the adsorbent layer 12 to the set temperature, so as to desorb and regenerate the adsorbent. 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 disclosed embodiment.

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 assembly 2 to perform preliminary indirect cooling on the adsorbent layer 12 to cool it to room temperature, so as to facilitate the subsequent operation of the adsorption mode of the adsorption regenerator 1.

It should be understood that compared with directly entering the adsorption mode after the regeneration mode ends, since the ambient temperature is greater than the temperature when the adsorption regenerator 1 operates in the adsorption mode, if the regenerated adsorbent layer 12 is directly cooled to the sub-zero temperature zone by the heat exchange medium at the second temperature, the energy consumption is relatively large. Therefore, the adsorbent layer 12 is first pre-cooled to room temperature by passing the heat exchange medium at the first temperature, and then the adsorbent layer 12 is cooled to the sub-zero temperature zone by the heat exchange medium at the second temperature, and the overall energy consumption is reduced by step cooling.

For example, in the regeneration mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply component 2 to the heat exchanger 13 is 200°C to 400°C. In the precooling mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply component 2 to the heat exchanger 13 is 10°C to 30°C. In the adsorption mode, the temperature of the heat exchange medium supplied by the heat exchange medium supply component 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.

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

For example, if the heat exchange medium is air. In the adsorption mode, the heat exchange medium supply component 2 delivers -20°C to the heat exchanger 13. -10℃ low-temperature air. In regeneration mode, the heat exchange medium supply component 2 delivers hot air of 200℃～400℃ to the heat exchanger 13. In precooling mode, the heat exchange medium supply component 2 delivers normal temperature air of 10℃～30℃ to the heat exchanger 13. Since the cost of air is relatively low, air can be directly captured from the atmosphere and the acquisition method is convenient. Therefore, the use of air as the heat exchange medium can improve the economy of the multifunctional flue gas purification device of the disclosed embodiment.

In some embodiments, as shown in Fig. 1, the heat exchange medium supply assembly 2 includes an air pump 21, a refrigerator 22 and a heater 23. The air pump 21, the refrigerator 22 and the heater 23 are respectively connected to the heat exchanger 13 via pipelines to deliver heat exchange medium of different temperatures to the heat exchanger 13.

In the precooling mode, the air pump 21 passes room temperature air of 10°C to 30°C to the heat exchanger 13. In the adsorption mode, the refrigerator 22 passes low temperature air of -20°C to -10°C to the heat exchanger 13. In the regeneration mode, the heater 23 passes hot air of 200°C to 400°C to the heat exchanger 13.

In other words, in the adsorption mode, the air indirectly exchanges heat with the refrigerant in the refrigerator 22 to refrigerate low-temperature air of -20°C to -10°C and deliver it to the heat exchanger 13 to indirectly cool the flue gas and the adsorbent layer 12 to the sub-zero temperature zone. In the regeneration mode, the air is heated by the heater 23 to generate hot air of 200°C to 400°C and deliver it to the heat exchanger 13 to indirectly heat the adsorbent layer 12. In the precooling mode, the air pump 21 directly extracts normal temperature air of 10°C to 30°C from the atmosphere and delivers it to the heat exchanger 13 to precool the regenerated adsorbent layer 12.

In some embodiments, a first partition 14 and a second partition 15 are disposed 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 .

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 precooling rotation operations, avoiding the problems of adsorbent movement wear, material blockage and poor air tightness caused by the moving bed adsorber.

In some embodiments, the shell 11 is disposed 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.

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 in the vertical direction 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.

Specifically, as shown in FIG1 , the housing 11 is a vertical oblong container, the first partition 14 and the second partition 15 are arranged in the horizontal direction and in close contact with the inner wall of the housing 11, and the first partition 14 and the second partition 15 are spaced apart in the vertical direction. The space defined between the first partition 14 and the second partition 15 is the adsorption space, the smoke intake space is below the first partition 14, and the smoke exhaust space is above the second partition 15. 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, and 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.

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

In some embodiments, a plurality of smoke holes are respectively formed on the first partition 14 and the second partition 15 , and 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.

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.

In some embodiments, as shown in FIG1 , the heat exchange tube 131 is buried in the adsorbent layer 12, and the heat exchange tube 131 rises in a spiral shape. One end of the inlet of the heat exchange tube 131 penetrates the shell wall of the shell 11, so that the inlet of the heat exchange tube 131 is located outside the shell 11. One end of the outlet of the heat exchange tube 131 penetrates the shell wall of the shell 11, so that the outlet of the heat exchange tube 131 is located outside the shell 11. In addition, the inlet of the heat exchange tube 131 is adjacent to the bottom of the shell 11, and the outlet of the heat exchange tube 131 is adjacent to the top of the shell 11.

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 to the heat exchanger 13.

That is, when the adsorption regenerator 1 is in the adsorption mode, the medium switching component 3 controls the pipeline between the refrigerator 22 and the heat exchanger 13 to be connected, so that the refrigerator 22 passes low-temperature air to the heat exchanger 13. When the adsorption regenerator 1 is in the regeneration mode, the medium switching component 3 controls the pipeline between the heater 23 and the heat exchanger 13 to be connected, so that the heater 23 passes hot air to the heat exchanger 13. When the adsorption regenerator 1 is in the precooling mode, the medium switching component 3 controls the pipeline between the air pump 21 and the heat exchanger 13 to be connected, so that the air pump 21 passes normal temperature air to the heat exchanger 13.

For example, the medium switching component 3 includes a four-way valve, and the four-way valve has 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.

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.

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.

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 through pipelines. Similarly, a four-way valve 3 can also be installed on the pipeline 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.

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

The control method of the multifunctional flue gas purification device of the embodiment of the present disclosure, wherein the multifunctional flue gas purification device includes an adsorption regenerator 1, the adsorption regenerator 1 includes a shell 11, an adsorbent layer 12 arranged in the shell 11 and a heat exchanger 13 arranged in the shell 11, and the control method includes:

The adsorption regenerator 1 is operated in a precooling mode: a heat exchange medium at a first temperature (normal temperature air of 10° C. to 30° C.) is introduced into the heat exchanger 13 to precool the adsorbent layer 12 .

The adsorption regenerator 1 is operated 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.

The adsorption regenerator 1 is operated in a regeneration mode: the introduction of flue gas into the housing 11 is stopped, 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 .

It is understandable that during the flue gas purification process, the adsorption regenerator 1 cyclically operates the adsorption mode, the regeneration mode and the precooling mode. The adsorption regenerator 1 operates the adsorption mode to purify the incoming flue gas by adsorption. After the adsorbent is saturated with adsorption, the adsorption regenerator 1 operates the regeneration mode to desorb and regenerate the saturated adsorbent. After the adsorbent is desorbed and regenerated, the adsorption regenerator 1 operates the precooling mode to precool the adsorbent layer 12 heated during the regeneration process.

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 referred device or element 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 disclosure.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. Those skilled in the art can understand the specific meanings of the above terms in this disclosure according to specific circumstances.

In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

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

Claims (9)

A multifunctional flue gas purification device, characterized in that it comprises: 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. The multifunctional flue gas purification device according to claim 1 is characterized in that the heat exchange medium is air, water or refrigerant. The multifunctional flue gas purification device according to claim 2 is characterized in that 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 10°C to 30°C normal temperature air to the heat exchanger, in the adsorption mode, the refrigerator passes -20°C to -10°C low temperature air to the heat exchanger, and in the regeneration mode, the heater passes 200°C to 400°C hot air to the heat exchanger. The multifunctional flue gas purification device according to any one of claims 1 to 3 is 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 into the heat exchanger. The multifunctional flue gas purification device according to any one of claims 1 to 4 is characterized in that the heat exchanger is a serpentine, spiral or vortex-shaped heat exchange tube. The multifunctional flue gas purification device according to any one of claims 1 to 5 is characterized in that a first partition and a second partition are provided in the outer shell to define a smoke inlet space, an adsorption space and a smoke exhaust space which are connected in sequence in the outer 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, and the smoke exhaust space is connected to the smoke outlet of the adsorption regenerator. The multifunctional flue gas purification device according to claim 6 is characterized in that the outer shell is a vertical oblong container, and the first partition and the second partition are spaced apart vertically. The multifunctional flue gas purification device according to claim 7 is 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. 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, 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.