CN116351207B - Low-temperature flue gas adsorption tower with flue gas cooling function and adsorption method - Google Patents
Low-temperature flue gas adsorption tower with flue gas cooling function and adsorption method Download PDFInfo
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- CN116351207B CN116351207B CN202310640162.0A CN202310640162A CN116351207B CN 116351207 B CN116351207 B CN 116351207B CN 202310640162 A CN202310640162 A CN 202310640162A CN 116351207 B CN116351207 B CN 116351207B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/08—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds according to the "moving bed" method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/402—Further details for adsorption processes and devices using two beds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/416—Further details for adsorption processes and devices involving cryogenic temperature treatment
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Abstract
The invention relates to the technical field of adsorption and purification and discloses a low-temperature flue gas adsorption tower with a flue gas cooling function and an adsorption method. The low-temperature flue gas adsorption tower comprises a tower barrel, a plurality of moving beds and cooling pipes, wherein the upper part of the tower barrel is provided with a feed inlet and a flue gas outlet, the lower part of the tower barrel is provided with a discharge outlet and a flue gas inlet, the tower barrel comprises a plurality of adsorption sections which are arranged in the vertical direction and at least one cooling section, the cooling sections are arranged between two adjacent adsorption sections, the moving beds are arranged in the adsorption sections in a one-to-one correspondence manner, low-temperature flue gas entering the tower barrel from the flue gas inlet sequentially passes through the moving beds and the cooling sections from bottom to top and then is discharged from the flue gas outlet, and the cooling pipes are arranged in the cooling sections and are used for indirectly cooling the flue gas passing through the cooling sections. The low-temperature flue gas adsorption tower has excellent adsorption efficiency, and deep purification and near zero emission of flue gas are realized by maintaining the low-temperature level of the flue gas.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a low-temperature flue gas adsorption tower with a flue gas cooling function and an adsorption method.
Background
The low-temperature flue gas removal removes pollutant components from low-temperature flue gas by an adsorbent adsorption principle, and the flue gas is purified. In a low-temperature (room temperature or below), nitrogen oxides in the flue gas are subjected to a low-temperature oxidation adsorption phenomenon on the surface of an adsorbent such as activated carbon, namely, nitric oxide gas which is difficult to adsorb is oxidized into nitrogen dioxide gas which is easy to adsorb, so that the carbon monoxide removal effect is improved. In addition, the removal effect of the components such as sulfur dioxide, carbon dioxide and heavy metals in the low-temperature environment is improved in multiple.
The low-temperature flue gas adsorption system proposed in the related art adopts an adsorption tower to adsorb and purify flue gas, but certain heat is usually released in the flue gas adsorption process, so that the temperature of the flue gas rises, and the adsorption and purification effects are affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a low-temperature flue gas adsorption tower with a flue gas cooling function.
The invention also provides an adsorption method using the low-temperature flue gas adsorption tower with the flue gas cooling function.
The low-temperature flue gas adsorption tower with the flue gas cooling function comprises: the tower comprises a tower barrel, wherein a feed inlet and a flue gas outlet are formed in the upper part of the tower barrel, a discharge outlet and a flue gas inlet are formed in the lower part of the tower barrel, the tower barrel comprises a plurality of adsorption sections which are arranged in the vertical direction, and at least one cooling section, and the cooling section is arranged between two adjacent adsorption sections; the moving beds are arranged in the adsorption section in a one-to-one correspondence manner, and low-temperature flue gas at room temperature or below enters the tower from the flue gas inlet, passes through the moving beds and the cooling section from bottom to top and is discharged from the flue gas outlet; and the cooling pipe is arranged in the cooling section and used for indirectly cooling the flue gas passing through the cooling section.
Optionally, the moving beds are communicated through a blanking pipe, the blanking pipe passes through the cooling section, and the adsorbent put into the tower from the feeding hole flows through the moving beds from top to bottom and is discharged from the discharging hole.
Optionally, the adsorbent in the blanking tube exchanges heat with the flue gas in the cooling section to reduce the temperature of the adsorbent.
Optionally, the moving bed is a countercurrent adsorption bed, wherein in the adsorption section, flue gas flows countercurrent to the adsorbent; alternatively, the moving bed is a cross-flow adsorbent bed, wherein in the adsorption section, flue gas passes through the cross-flow adsorbent bed in a horizontal direction.
Optionally, the adsorption section includes a first adsorption section and a second adsorption section, the moving bed includes a first moving bed and a second moving bed, the first moving bed is disposed in the first adsorption section, the second moving bed is disposed in the second adsorption section, and the cooling section is one and is disposed between the first adsorption section and the second adsorption section.
Optionally, the second moving bed is located above the first moving bed, the feed inlet is communicated with a top inlet of the second moving bed, a bottom outlet of the second moving bed is communicated with a top inlet of the first moving bed through a blanking pipe, and a bottom outlet of the first moving bed is communicated with the discharge outlet.
Optionally, the first moving bed and the second moving bed are cross-flow adsorption beds, the first adsorption section is provided with a first smoke inlet flow channel and a first smoke outlet flow channel, the second adsorption section is provided with a second smoke inlet flow channel and a second smoke outlet flow channel, the smoke inlet is communicated with the first smoke inlet flow channel, the first smoke inlet flow channel and the first smoke outlet flow channel are opposite to each other on two sides of the first moving bed, the first smoke outlet flow channel is communicated with the second smoke inlet flow channel through the cooling section, the second smoke inlet flow channel and the second smoke outlet flow channel are opposite to each other on two sides of the second moving bed, and the second smoke outlet flow channel is communicated with the smoke outlet.
Optionally, the cooling tube comprises a plurality of serpentine tube sections which are arranged at intervals in the vertical direction, wherein adjacent serpentine tube sections are communicated, and the serpentine tube sections extend in the horizontal plane.
Optionally, a cold insulation agent channel is arranged in the wall of the tower barrel, and cold insulation agent flows through the cold insulation agent channel to cool the adsorption section, wherein the temperature of the cold insulation agent is lower than or equal to that of the low-temperature flue gas.
The adsorption method using the adsorption tower with the flue gas cooling function comprises the following steps:
the adsorbent is supplied to the tower from the feed inlet and flows downwards in the moving bed;
low-temperature flue gas enters the tower from the flue gas inlet;
the temperature of the low-temperature flue gas is increased by 10-20 ℃ after being adsorbed by the adsorption section;
the flue gas enters the cooling section to be cooled, and the temperature is reduced to or below the initial temperature;
the cooled low-temperature flue gas sequentially enters the next adsorption section and the cooling section and is finally discharged from the flue gas outlet;
and discharging the adsorbent saturated in adsorption from the discharge hole.
The low-temperature flue gas adsorption tower has a flue gas cooling function, and the adsorption sections are arranged in the tower barrel, and the cooling sections are arranged between the adsorption sections, so that low-temperature flue gas is subjected to adsorption in the adsorption sections, and then enters the cooling sections to be cooled to an initial temperature before entering the next adsorption section, and the influence on low-temperature adsorption efficiency due to continuous increase of flue gas temperature caused by adsorption heat release is avoided. Therefore, the low-temperature flue gas adsorption tower has excellent adsorption efficiency, and solves the problem of reduced adsorption efficiency caused by adsorption heat release. By maintaining the low temperature level of the flue gas, the deep purification and near zero emission of the flue gas are realized.
Drawings
Fig. 1 is a low temperature flue gas adsorption tower with flue gas cooling function according to an embodiment of the present invention.
Reference numerals:
the low-temperature flue gas adsorption tower 100, a tower drum 110, a feed inlet 111, a discharge outlet 112, a flue gas inlet 113, a flue gas outlet 114, a first adsorption section 115, a first flue gas inlet channel 1151, a first flue gas outlet channel 1152, a cooling section 116, a flue gas channel 1161, a second adsorption section 117, a second flue gas inlet channel 1171, a second flue gas outlet channel 1172, a first moving bed 120, a second moving bed 130, a cooling pipe 140, a serpentine pipe section 141 and a blanking pipe 150.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The low-temperature flue gas adsorption tower with a flue gas cooling function according to an embodiment of the present invention is described below with reference to fig. 1. The low temperature flue gas adsorption tower 100 comprises a tower drum 110, a plurality of moving beds and cooling pipes 140.
The upper portion of a tower 110 is provided with a feed inlet 111 and a flue gas outlet 114, the lower portion of the tower 110 is provided with a discharge outlet 112 and a flue gas inlet 113, the tower 110 comprises a plurality of adsorption sections and at least one cooling section 116 which are arranged in the vertical direction, and the cooling section 116 is arranged between two adjacent adsorption sections.
The moving beds are arranged in the adsorption section in a one-to-one correspondence, and low-temperature flue gas with the temperature of room temperature or below entering the tower 110 from the flue gas inlet 113 passes through the moving beds and the cooling section 116 from bottom to top and is discharged from the flue gas outlet 114. When passing through the adsorption section, the flue gas contacts with the adsorbent in the moving bed in the adsorption section, the pollutants in the flue gas are adsorbed by the adsorbent, and the flue gas is purified. The cooling pipe 140 is disposed in the cooling section 116, and is used for indirectly cooling the flue gas passing through the cooling section 116, and reducing the temperature of the flue gas after adsorption to the initial temperature, so that the flue gas can be maintained at a low temperature level when entering the next adsorption section for adsorption.
The low-temperature flue gas adsorption tower provided by the embodiment of the invention has a flue gas cooling function, and the adsorption sections are arranged in the tower barrel, so that the low-temperature flue gas is adsorbed in the adsorption sections and then enters the cooling section to be cooled before entering the next adsorption section, and the influence on the low-temperature adsorption efficiency due to the rise of the flue gas temperature caused by adsorption heat release is avoided. Therefore, the low-temperature flue gas adsorption tower provided by the embodiment of the invention has excellent adsorption efficiency, solves the problem of reduction of adsorption efficiency caused by adsorption heat release, and realizes deep purification and near zero emission of flue gas by maintaining the low-temperature level of the flue gas.
In some embodiments, the moving beds are connected through a discharging pipe 150, the discharging pipe 150 passes through the cooling section 116, and the adsorbent fed into the tower 110 from the feed inlet 111 flows through the moving beds from top to bottom and is discharged from the discharge outlet 112. That is, a blanking pipe 150 is provided through the cooling section 116 for communicating two moving beds adjacent to the cooling section 116.
The adsorbent charged from the inlet 111 of the column 110 falls into the moving bed at the top and gradually moves downward, and enters the next moving bed through the discharge pipe 150 connected to the moving bed, and finally, the adsorbent saturated with adsorption is discharged from the outlet 112 at the bottom of the column 110.
In some embodiments, the sorbent within the feed tube 150 is in heat exchange with the flue gas in the cooling section 116 to reduce the sorbent temperature. That is, the discharging pipe 150 is disposed through the cooling section 116, and the discharging pipe 150 has heat exchange capability, so that the flowing adsorbent in the discharging pipe 150 can exchange heat with the low-temperature flue gas outside the pipe, and the temperature of the adsorbent is reduced to a certain extent. The heat generated by adsorption carried in the adsorbent is transferred to the flue gas, and further transferred to the cooling medium in the cooling pipe 130, and carried out by the cooling medium. Thus, the cooling tubes 130 in the cooling section 116 achieve a common cooling of the flue gas and the adsorbent, further improving the adsorption efficiency.
In some embodiments, the moving bed is a counter-current adsorbent bed, in which flue gas flows counter-current to the adsorbent. Wherein the flue gas flows from bottom to top, the adsorbent flows downwards under the action of gravity, and the flue gas and the adsorbent are contacted and adsorbed.
In other embodiments, the moving bed is a cross-flow adsorbent bed through which the flue gas passes in a horizontal direction in the adsorption section. The flue gas contacts the adsorbent moving in the adsorbent bed in the process of passing through the cross-flow adsorbent bed, so that pollutants are removed.
A low temperature flue gas adsorption tower 100 according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the upper part of the tower 110 is provided with a feed inlet 111, the lower part is provided with a discharge outlet 112, and the side wall of the tower 110 is provided with a flue gas inlet 113 and a flue gas outlet 114. The flue gas inlet 113 is located below the flue gas outlet 114. The interior of the tower 110 is divided into a first adsorption section 115, a cooling section 116 and a second adsorption section 117 from bottom to top. The moving beds include a first moving bed 120 and a second moving bed 130, the first moving bed 120 being disposed within the first adsorption section 115 and the second moving bed 130 being disposed within the second adsorption section 117.
The temperature of the low-temperature flue gas entering the tower 110 through the flue gas inlet 113 is at or below room temperature. The low-temperature flue gas flows from bottom to top after entering the tower 110 from the flue gas inlet 113 at the bottom of the tower 110, sequentially passes through the first adsorption section 115, is contacted and adsorbed with the first moving bed 120 in the first adsorption section 115, and the temperature of the flue gas is increased after preliminary adsorption. The flue gas enters the cooling section 116 and exchanges heat with the cooling pipe 140, and the temperature of the flue gas is reduced to the initial temperature under the action of the cooling pipe 140. The cooled flue gas enters the second adsorption section 117, contacts and adsorbs with the second moving bed 130 in the second adsorption section 117, and the residual pollutants in the flue gas are removed under the action of the adsorbent, so that the deep purification and zero emission of the flue gas are realized.
In the embodiment shown in fig. 1, the second moving bed 130 is located above the first moving bed 120, the feed inlet 111 at the top of the tower 110 is communicated with the top inlet of the second moving bed 130, the bottom outlet of the second moving bed 130 is communicated with the top inlet of the first moving bed 120 through the blanking pipe 150, the blanking pipe 150 passes through the cooling section 116, and the bottom outlet of the first moving bed 120 is communicated with the discharge outlet 112 at the bottom of the tower 110. The adsorbent entering the tower 110 from the feed inlet 111 flows through the second moving bed 130 first, and after passing through the second moving bed 130, the adsorbent is not saturated by adsorption, so the adsorbent continues to flow downwards into the first moving bed 120 to perform adsorption purification on raw flue gas, and at the stage, the adsorbent is basically saturated by adsorption, is discharged from the discharge outlet 112 at the bottom of the tower and is sent to regeneration.
In other alternative embodiments, a portion of the adsorbent entering the column 110 from the feed inlet 111 enters the first moving bed 120 and another portion enters the second moving bed 130, and the adsorbent is discharged from the discharge outlet 112 for regeneration after passing through the first moving bed 120 or the second moving bed 130. That is, the top feed ports 111 of the first moving bed 120 and the second moving bed 130 are respectively communicated with the feed ports 111, and the bottom discharge ports 112 of the first moving bed 120 and the second moving bed 130 are respectively discharged from the discharge ports 112 at the bottom of the tower 110.
In the embodiment shown in fig. 1, the first moving bed 120 and the second moving bed 130 are both cross-flow adsorbent beds through which flue gas passes in a horizontal direction in the first adsorption section 115 and the second adsorption section 117.
Specifically, the first adsorption section 115 has a first smoke inlet channel 1151 and a first smoke outlet channel 1152, the second adsorption section 117 has a second smoke inlet channel 1171 and a second smoke outlet channel 1172, the smoke inlet 113 is communicated with the first smoke inlet channel 1151, the first smoke inlet channel 1151 and the first smoke outlet channel 1152 are opposite at two sides of the first moving bed 120, the first smoke outlet channel 1152 is communicated with the smoke channel 1161 of the cooling section 116, the smoke channel 1161 is communicated with the second smoke inlet channel 1171, the second smoke inlet channel 1171 and the second smoke outlet channel 1172 are opposite at two sides of the second moving bed 130, and the second smoke outlet channel 1172 is communicated with the smoke outlet 114.
The low-temperature flue gas enters the first flue gas inlet channel 1151 from the flue gas inlet 113, the low-temperature flue gas in the first flue gas inlet channel 1151 passes through the first moving bed 120 and enters the first flue gas outlet channel 1152 to complete the adsorption in the first stage, and most pollutants are removed. During the first stage of adsorption, the temperature of the flue gas increases, and enters the flue gas flow passage 1161 of the cooling section 116 to exchange heat with the cooling tube 140, and the flue gas is cooled to an initial temperature. And then enters the second smoke inlet flow passage 1171, low-temperature smoke in the second smoke inlet flow passage 1171 passes through the second moving bed 130 and enters the second smoke outlet flow passage 1172 to finish the adsorption of the second stage, and in the adsorption process of the second stage, the residual pollutants in the smoke are removed by the adsorbent in the second moving bed 130, so that the deep purification and near zero emission of the smoke are realized, and the clean smoke is discharged from the smoke outlet 114.
In some embodiments, the cooling tube 140 includes a plurality of serpentine tube segments 141 disposed at intervals in a vertical direction, adjacent serpentine tube segments 141 are in communication, and the serpentine tube segments 141 extend in a horizontal plane, thereby improving the cooling effect of the cooling tube 140 on the flue gas.
In some embodiments, a cold insulation channel is disposed in the wall of the tower 110, and a cold insulation agent circulates in the cold insulation channel to insulate the adsorption section, wherein the temperature of the cold insulation agent is lower than or equal to the temperature of the low-temperature flue gas. For example, the wall of the tower 110 corresponding to each adsorption section is provided with a cold insulation agent channel, so that the adsorption sections are cooled, the heat insulation effect on the flue gas is further improved, and the low-temperature adsorption efficiency of the flue gas is improved.
The embodiment of the invention also provides an adsorption method, which uses the low-temperature flue gas adsorption tower 100 to carry out flue gas adsorption and purification, and comprises the following steps:
the adsorbent enters the column 100 from the feed port 111 and flows downward in the moving bed;
low-temperature flue gas enters the tower 110 from the flue gas inlet 113;
the temperature of the low-temperature flue gas is increased by 10-20 ℃ after being adsorbed by an adsorption section;
the flue gas enters a cooling section to be cooled, and the temperature is reduced to or below the initial temperature;
the cooled low-temperature flue gas sequentially enters the next adsorption section and the cooling section and is finally discharged from a flue gas outlet 114;
the adsorption saturated adsorbent eventually exits outlet 112.
Preferably, the temperature of the low temperature flue gas is between minus 30 ℃ and 0 ℃.
The low-temperature flue gas adsorption method according to the embodiment of the present invention will be described below by taking the low-temperature flue gas adsorption tower 100 shown in fig. 1 as an example, and includes:
the adsorbent enters the first adsorption section 115 from feed inlet 111 and flows downward into the second adsorption section 117;
low-temperature flue gas with the temperature of about minus 15 ℃ enters the tower 110 from the flue gas inlet 113;
the temperature of the low-temperature flue gas is increased to about 0 ℃ after the low-temperature flue gas is adsorbed by the first adsorption section 115;
the flue gas enters a cooling section 116 to be cooled, and the temperature is reduced to about minus 15 ℃ again;
the low-temperature flue gas after being cooled again enters the second adsorption section 117 and is discharged from the flue gas outlet 114 after being adsorbed;
the absorbed adsorbent is discharged from a discharge hole 112;
the adsorbent discharged from the discharge port 112 is fed into a regeneration tower to be heated and regenerated, and the regenerated adsorbent is fed to the feed port 111.
Optionally, the temperature of the adsorbent entering the tower 110 from the feed inlet 111 is 50 degrees celsius-100 degrees celsius.
In summary, the low-temperature flue gas adsorption tower with the flue gas cooling function and the adsorption method provided by the embodiment of the invention can realize cooling and adsorption of flue gas, maintain the low-temperature level of the flue gas, and realize deep purification and near zero emission of the flue gas.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (8)
1. A low temperature flue gas adsorption tower with flue gas cooling function, characterized by comprising:
the tower comprises a tower barrel, wherein a feed inlet and a flue gas outlet are formed in the upper part of the tower barrel, a discharge outlet and a flue gas inlet are formed in the lower part of the tower barrel, the tower barrel comprises a plurality of adsorption sections which are arranged in the vertical direction, and at least one cooling section, and the cooling section is arranged between two adjacent adsorption sections;
the moving beds are arranged in the adsorption section in a one-to-one correspondence manner, low-temperature flue gas with room temperature or below enters the tower from the flue gas inlet, passes through the moving beds and the cooling section from bottom to top, is discharged from the flue gas outlet, the moving beds are communicated through a blanking pipe, the blanking pipe passes through the cooling section, and the adsorbent thrown into the tower from the feed inlet flows through the moving beds from top to bottom and is discharged from the discharge port;
the cooling pipe is arranged in the cooling section and is used for indirectly cooling flue gas passing through the cooling section, and the adsorbent in the discharging pipe exchanges heat with the flue gas in the cooling section to reduce the temperature of the adsorbent in the discharging pipe, so that the cooling pipe in the cooling section realizes common cooling of the flue gas and the adsorbent.
2. The low temperature flue gas adsorption tower with flue gas cooling function according to claim 1, wherein the moving bed is a countercurrent adsorption bed, wherein flue gas flows countercurrent to the adsorbent in the adsorption section; alternatively, the moving bed is a cross-flow adsorbent bed, wherein in the adsorption section, flue gas passes through the cross-flow adsorbent bed in a horizontal direction.
3. The low temperature flue gas adsorption tower with flue gas cooling function according to any one of claims 1 to 2, wherein the adsorption section comprises a first adsorption section and a second adsorption section, the moving bed comprises a first moving bed and a second moving bed, the first moving bed is arranged in the first adsorption section, the second moving bed is arranged in the second adsorption section, and the cooling section is one and is positioned between the first adsorption section and the second adsorption section.
4. The flue gas adsorption tower according to claim 3, wherein the second moving bed is located above the first moving bed, the feed inlet is communicated with a top inlet of the second moving bed, a bottom outlet of the second moving bed is communicated with a top inlet of the first moving bed through a blanking pipe, and a bottom outlet of the first moving bed is communicated with the discharge outlet.
5. The low-temperature flue gas adsorption tower with flue gas cooling function according to claim 4, wherein the first moving bed and the second moving bed are cross-flow adsorption beds,
the first adsorption section is provided with a first smoke inlet flow channel and a first smoke outlet flow channel, the second adsorption section is provided with a second smoke inlet flow channel and a second smoke outlet flow channel, the smoke inlet is communicated with the first smoke inlet flow channel, the first smoke inlet flow channel and the first smoke outlet flow channel are opposite to each other on two sides of the first moving bed, the first smoke outlet flow channel is communicated with the second smoke inlet flow channel through the cooling section, the second smoke inlet flow channel and the second smoke outlet flow channel are opposite to each other on two sides of the second moving bed, and the second smoke outlet flow channel is communicated with the smoke outlet.
6. The low temperature flue gas adsorption tower with flue gas cooling function according to any one of claims 1-2 and 4-5, wherein the cooling pipes comprise a plurality of serpentine pipe sections which are arranged at intervals in the vertical direction, adjacent serpentine pipe sections are communicated, and the serpentine pipe sections extend in the horizontal plane.
7. The low-temperature flue gas adsorption tower with a flue gas cooling function according to any one of claims 1-2 and 4-5, wherein a cold insulation agent channel is arranged in the wall of the tower barrel, a cold insulation agent flows through the cold insulation agent channel to cool the adsorption section, and the temperature of the cold insulation agent is lower than or equal to that of the low-temperature flue gas.
8. An adsorption method using the adsorption tower having a flue gas cooling function according to any one of claims 1 to 7, characterized by comprising:
the adsorbent is supplied to the tower from the feed inlet and flows downwards in the moving bed;
low-temperature flue gas enters the tower from the flue gas inlet;
the temperature of the low-temperature flue gas is increased by 10-20 ℃ after being adsorbed by the adsorption section;
the flue gas enters the cooling section to be cooled, and the temperature is reduced to or below the initial temperature;
the cooled low-temperature flue gas sequentially enters the next adsorption section and the cooling section and is finally discharged from the flue gas outlet;
and discharging the adsorbent saturated in adsorption from the discharge hole.
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| CN117065515B (en) * | 2023-10-13 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Multilayer series cross-flow low-temperature flue gas purification tower and low-temperature flue gas treatment system |
| CN117065517B (en) * | 2023-10-13 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Cross-flow low-temperature adsorption tower with cross bed layers and low-temperature flue gas adsorption system |
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