CN116351197B - Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system - Google Patents
Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system Download PDFInfo
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- CN116351197B CN116351197B CN202310640161.6A CN202310640161A CN116351197B CN 116351197 B CN116351197 B CN 116351197B CN 202310640161 A CN202310640161 A CN 202310640161A CN 116351197 B CN116351197 B CN 116351197B
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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
- B01D53/04—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 stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/34—Regenerating or reactivating
- B01J20/3483—Regenerating or reactivating by thermal treatment not covered by groups B01J20/3441 - B01J20/3475, e.g. by heating or cooling
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- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The application relates to the technical field of flue gas purification and discloses a flue gas distributor, an adsorption tower and a low-temperature flue gas adsorption system. The flue gas distributor comprises a plurality of flue gas distribution pipes, the flue gas distribution pipes are horizontally arranged, the flue gas distribution pipes are mutually parallel and are arranged at intervals along the first horizontal direction, the flue gas distribution pipes are provided with opposite first ends and second ends in the extending direction, at least one of the first ends and the second ends is opened to form a flue gas inlet, the flue gas distribution pipes are provided with a plurality of flue gas distribution holes positioned at the upper part of the flue gas distribution pipes on the cross section of the flue gas distribution pipes, and a channel for the adsorbent blanking is formed at intervals between every two adjacent flue gas distribution pipes. The flue gas distributor has the advantages of simple structure, greatly reduced height in the vertical direction, reduced space occupied in the vertical direction when being applied to the adsorption tower, reduced height of an adsorption bed layer in the adsorption tower, difficult blockage and good practicability and reliability.
Description
Technical Field
The application relates to the technical field of flue gas adsorption, in particular to a flue gas distributor, an adsorption tower and a low-temperature flue gas adsorption system.
Background
The flue gas adsorption is to remove pollutant components from the flue gas by using an adsorbent in an adsorption bed layer in an adsorption tower, thereby achieving the purpose of purifying the flue gas. Common flue gas adsorption towers are fixed bed type and moving bed type, wherein the moving bed type adsorption tower can better guarantee the adsorption efficiency and the adsorption capacity of the adsorption bed compared with the fixed bed type adsorption tower. In the moving bed adsorption tower, the adsorbent continuously moves downwards and the flow direction of the flue gas is opposite to the moving direction of the adsorbent. However, in the related art, the flue gas contacts the adsorbent unevenly in the adsorbent tower, and the adsorption effect is uneven, and particularly in the moving bed type adsorption tower, the problem is particularly obvious.
Disclosure of Invention
The present application has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
the inventor's prior issued patent describes a moving bed adsorption column employing a distributor and multiple blanking tubes arranged separately for blanking and flue gas distribution. The inventor realizes through further research that the space occupied by the distributor and the blanking pipe of the adsorption tower in the vertical direction is larger (the space occupies approximately 1m-2 m), the space is not an adsorbent layer section of the adsorption bed, the space proportion occupied by an ineffective adsorption area in the adsorption tower is larger, the adsorption capacity is reduced, the overall height and the volume of the adsorption tower are higher, the construction cost of the tower body is increased, and the problems of weak stability and easy shaking of the tower body are easily caused due to the higher height of the adsorption tower.
The present application aims to solve at least one of the technical problems in the related art to some extent. Therefore, the application provides the horizontally arranged flue gas distributor which is simple in structure and small in occupied space in the vertical direction.
The application also provides an adsorption tower with the flue gas distributor and a low-temperature flue gas adsorption system comprising the adsorption tower.
The flue gas distributor of the present application comprises: the flue gas distribution pipes are horizontally arranged, the flue gas distribution pipes are parallel to each other and are arranged at intervals along the first horizontal direction, the flue gas distribution pipes are provided with opposite first ends and second ends in the extending direction, at least one of the first ends and the second ends is opened to form a flue inlet, the flue gas distribution pipes are provided with a plurality of flue gas distribution holes positioned at the upper part of the flue gas distribution pipes, and the interval between every two adjacent flue gas distribution pipes forms a channel for the falling of the adsorbent.
Optionally, the pores of the flue gas distribution holes are smaller than the particle size of the adsorbent to prevent the adsorbent from falling into the flue gas distribution tube through the flue gas distribution holes.
Optionally, a material leakage opening is formed in the lower portion of the flue gas distribution pipe, the minimum size of the material leakage opening is larger than the particle size of the adsorbent, and the material leakage opening is used for enabling the adsorbent entering the flue gas distribution pipe to leak out.
Optionally, the flue gas distribution pipe is a grid-shaped pipe, the mesh holes at the upper part of the flue gas distribution pipe are the flue gas distribution holes, and the mesh holes at the lower part of the flue gas distribution pipe are the material leakage openings.
Optionally, the bottom of the flue gas distribution pipe is opened to form a strip-shaped material leakage opening, and the extending direction of the material leakage opening is the same as the extending direction of the flue gas distribution pipe.
Optionally, the flue gas distribution pipe is a round pipe, and the central angle corresponding to the material leakage opening is 10-30 degrees.
Optionally, the height of the flue gas distributor in the vertical direction is 80mm-300mm; and/or the interval between two adjacent flue gas distribution pipes is 50-80mm.
The application also provides an adsorption tower, which comprises: the tower body is internally provided with a movable adsorption bed, the top of the tower body is provided with a feed inlet, the bottom of the tower body is provided with a discharge outlet, the side wall of the tower body is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is positioned above the adsorption bed; the flue gas distributor is the flue gas distributor, the flue gas distributor is arranged in the tower body and positioned below the adsorption bed, a flue gas inlet of the flue gas distributor is communicated with the flue gas inlet, and the adsorbent in the adsorption bed falls from the interval between two adjacent flue gas distribution pipes and is discharged from the discharge port.
Optionally, the flue gas inlet comprises a first flue gas inlet and a second flue gas inlet, the first end of the flue gas distribution pipe is provided with a first flue gas inlet, the second end of the flue gas distribution pipe is provided with a second flue gas inlet, the first flue gas inlet is communicated with the first flue gas inlet, and the second flue gas inlet is communicated with the second flue gas inlet; and/or the height of the adsorption tower in the vertical direction is 3.0m-6.0m.
The application also provides a low-temperature flue gas adsorption system, which comprises: the flue gas cooling device is used for cooling the flue gas to room temperature or below; the adsorption tower is the adsorption tower, and a smoke outlet of the smoke cooling device is communicated with a smoke inlet of the adsorption tower; the regeneration tower is used for regenerating the adsorbent, the discharge port of the adsorption tower is communicated with the regeneration inlet of the regeneration tower, and the regeneration outlet of the regeneration tower is communicated with the feed inlet of the adsorption tower.
The flue gas distributor comprises a plurality of horizontally arranged flue gas distribution pipes, wherein flue gas circulates in the pipes of the flue gas distribution pipes, the flue gas distribution holes distributed at the upper parts of the flue gas distribution pipes realize uniform dispersion of the flue gas, and the flue gas is contacted with an adsorbent uniformly, so that the flue gas is promoted to be adsorbed and purified uniformly, and the purification effect is improved. The flue gas distributor is particularly suitable for a moving bed type adsorption tower, the flue gas distributor is arranged below an adsorption bed, the interval between two adjacent flue gas distribution pipes can be used for blanking of adsorbents in the adsorption bed, namely, the flue gas distributor realizes double functions of blanking and flue gas dispersion, functions are integrated, the distributor which is arranged separately in the related art and a plurality of blanking pipes which extend in the vertical direction are replaced, the height in the vertical direction is obviously reduced, the proportion of invalid packing areas in the adsorption tower is reduced, the tower height (the height of which can be reduced by 1 meter at least) of the adsorption tower is facilitated to be reduced, or more adsorbents can be filled in the adsorption tower with the flue gas distributor under the same height, so that more excellent adsorption effect and adsorption efficiency are obtained.
Drawings
Fig. 1 is a front sectional view of an adsorption tower according to an embodiment of the present application.
Fig. 2 is a side sectional view of an adsorption tower according to an embodiment of the present application.
Fig. 3 is a top view of a flue gas distributor according to an embodiment of the present application.
Fig. 4 is a front view of a flue gas distributor according to an embodiment of the present application.
Fig. 5 is a bottom view of a smoke distributor according to another embodiment of the application.
Fig. 6 is a side view of the flue gas distributor tube of fig. 5.
Reference numerals:
the flue gas distributor 100, the flue gas distribution pipe 110, the first flue gas inlet 121, the second flue gas inlet 122, the flue gas distribution holes 130, the material leakage holes 140, the material leakage holes 141, the material leakage grooves 142,
The adsorption tower 200, the adsorption bed 210, the tower body 220, the feed inlet 221, the discharge outlet 222, the flue gas inlet 223, the first flue gas inlet 2231, the second flue gas inlet 2232, the flue gas outlet 224, the adsorption cavity 225, the blanking cavity 226 and the control valve 227.
Detailed Description
Reference will now be made in detail to embodiments of the present application, 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 application and should not be construed as limiting the application.
The flue gas distributor 100, the adsorption tower 200 having the flue gas distributor 100, and the low temperature flue gas adsorption system including the adsorption tower 200 of the present application are described below with reference to fig. 1 to 6.
The flue gas distributor 100 of the embodiment of the application comprises a plurality of flue gas distribution pipes 110, wherein the flue gas distribution pipes 110 are horizontally arranged, the flue gas distribution pipes 110 are mutually parallel and are arranged at intervals along a first horizontal direction, the flue gas distribution pipes 110 are provided with opposite first ends and second ends in the extending direction, at least one of the first ends and the second ends is opened to form a flue gas inlet, and a plurality of flue gas distribution holes 130 are distributed at the upper part of the flue gas distribution pipes 110 and are used for diffusing flue gas upwards. Here, it is to be understood that the upper part of the flue gas distribution tube means that in the cross section of the flue gas distribution tube, the flue gas distribution holes are located on the upper half of the flue gas distribution tube 110, e.g. above the horizontal centre line of the cross section of the flue gas distribution tube 110, preferably at the top of the flue gas distribution tube. The space between two adjacent flue gas distribution tubes 110 forms a channel for the falling of the adsorbent, whereby it is possible to avoid that a substantial part of the adsorbent particles fall into the flue gas distribution tubes 110.
There is a space between two adjacent flue gas distribution tubes 110 for the adsorbent to fall down. The flue gas distributor 100 is applied to the adsorption tower 200, and the adsorbent particles in the adsorption bed 210 in the adsorption tower 200 fall down through a plurality of intervals formed among the plurality of flue gas distribution pipes 110, so that the problem of adsorbent blockage is reduced.
The flue gas distributor provided by the embodiment of the application comprises a plurality of horizontally arranged flue gas distribution pipes, wherein flue gas circulates in the pipes of the flue gas distribution pipes, the flue gas distribution holes distributed at the upper part realize uniform dispersion of the flue gas, and the flue gas is contacted with the adsorbent uniformly so as to promote the flue gas to be adsorbed and purified uniformly.
The flue gas distributor provided by the embodiment of the application is particularly suitable for a moving bed type adsorption tower, the flue gas distributor is arranged below an adsorption bed of the adsorption tower, and the interval between two adjacent flue gas distribution pipes can be used for blanking of the adsorbent in the adsorption bed, namely, the flue gas distributor provided by the embodiment of the application realizes the functions of blanking and flue gas dispersion, integrates functions, replaces a distributor which is arranged separately in the related art and a plurality of blanking pipes which extend in the vertical direction, obviously reduces the height in the vertical direction, reduces the occupation ratio of an ineffective filler area in the adsorption tower, and is beneficial to reducing the tower body height (the height of at least 1 meter can be reduced). Or under the same height, the adsorption tower of the flue gas distributor can be filled with more adsorbents so as to obtain more excellent adsorption effect and adsorption efficiency.
In some embodiments, the pores of the flue gas distribution holes 130 are smaller than the sorbent particle size to prevent the sorbent from falling into the flue gas distribution tube through the flue gas distribution holes. By defining the pores of the flue gas distribution holes 130 of the flue gas distribution tube 110 to be smaller than the particle size of the adsorbent, a large portion of the adsorbent particles in the flue gas distribution tube 110 can be effectively prevented.
In some embodiments, a weep hole 140 is provided at the bottom of the flue gas distribution tube 110, and the smallest dimension of the weep hole 140 is larger than the particle size of the adsorbent. Even if some adsorbent particles, such as powder, fall into the flue gas distribution tube 110 through the flue gas distribution holes 130, the adsorbent entering the flue gas distribution tube 110 can leak out of the flue gas distribution tube 110 through the leak-out openings 140 in time, so that the blockage of the flue gas distributor 100 is effectively avoided. Where "minimum size of the weep hole 140" refers to the narrowest dimension of the weep hole 140. For example, the discharge port 140 may be a rectangular port having a smallest dimension corresponding to the dimension in the width direction, or may be a circular port having the same dimension in all directions, i.e., a diameter, as long as the adsorbent falling into the flue gas distribution tube can be leaked.
In some alternative embodiments, the weep hole 140 is a hole-like structure. The bottom of the flue gas distribution pipe 110 is provided with a plurality of material leakage holes 141 at intervals, that is, the bottom of each flue gas distribution pipe 110 is provided with a plurality of material leakage holes 141 correspondingly, and the shape of the material leakage holes 141 can be square or round. Preferably, the plurality of weeping holes 141 are uniformly distributed at the bottom of the flue gas distribution tube 110.
In some embodiments, as shown in fig. 4, the flue gas distribution pipe 110 is a grid-shaped pipe, the mesh holes distributed at the upper part of the flue gas distribution pipe 110 are flue gas distribution holes 130, and the mesh holes distributed at the lower part of the flue gas distribution pipe 110 are leakage holes 140. That is, the mesh size of the upper portion of the flue gas distribution tube 110 is smaller than the particle size of the adsorbent, and the mesh size of the lower half is larger than the particle size of the adsorbent.
Optionally, the particle size of the adsorbent is 4-8 mesh, the pore size of the flue gas distribution holes 130 is 10-14 mesh, and the pore size of the discharge openings 140 is 2-3 mesh. For example, the particle size of the adsorbent is 4 mesh, 6 mesh or 8 mesh, the pore size of the flue gas distribution holes 130 is 10 mesh, 12 mesh or 14 mesh, and the pore size of the weep holes 140 is 2 mesh, 2.5 mesh or 3 mesh.
In other embodiments, the weep hole 140 is a trough-like structure. As shown in fig. 5, the bottom of the flue gas distribution tube 110 is opened to form a long strip-shaped leakage port 140, i.e., a leakage groove 142, and the extending direction of the leakage groove 142 is the same as the extending direction of the flue gas distribution tube 110.
Alternatively, as shown in fig. 6, the flue gas distribution pipe 110 is a circular pipe, and the central angle corresponding to the material leakage groove 142 is 10 degrees to 30 degrees. For example, the center angle of the chute 142 is 10 degrees, 15 degrees, 20 degrees, or 30 degrees. The central angle corresponding to the material leakage groove 142 is the central angle corresponding to the notch at the bottom of the circular tube. The corresponding central angle of the material leakage groove 142 is 10-30 degrees, so that the adsorbent particles and the adsorbent powder falling into the flue gas distribution pipe 110 can be smoothly discharged downwards from the flue gas distribution pipe 110.
If the central angle corresponding to the material leakage groove 142 is smaller (smaller than 10 degrees), the width of the material leakage groove 142 is narrower, the adsorbent particles and the adsorbent powder falling into the smoke distribution pipe 110 are easily accumulated at the bottom of the smoke distribution pipe 110 and cannot be smoothly discharged, and if the central angle corresponding to the material leakage groove 142 is larger (larger than 30 degrees), the width of the material leakage groove 142 is wider, the structural strength of the smoke distribution pipe 110 is possibly influenced, and the smoke in the pipe is possibly leaked from the material leakage groove 142, so that the adsorption effect is influenced.
Alternatively, the height of the flue gas distributor 100 in the vertical direction is 80mm-300mm. Compared with the prior art distributor and blanking pipe solutions, the space occupied by the flue gas distributor 100 in the vertical direction is significantly reduced, for example, the height of the flue gas distributor 100 in the vertical direction is 80mm, 200mm or 300mm.
Alternatively, the spacing between two adjacent flue gas distribution tubes 110 is 50 mm-80 mm. For example, the spacing between two adjacent flue gas distribution tubes 110 is 50mm, 60mm or 80mm. The adsorbent falls from the interval between two adjacent flue gas distribution pipes 110, and the size of the interval influences the blanking rate of the adsorbent, so that the interval between the flue gas distribution pipes 110 can be designed by comprehensively considering the particle size of the adsorbent and the preset falling rate of the adsorbent.
As shown in fig. 1, the adsorption tower 200 with the flue gas distributor according to the embodiment of the present application includes a tower body 220, and the flue gas distributor 100 is disposed in the tower body 220. The tower 220 is filled with the movable adsorption bed 210, the top of the tower 220 is provided with a feed inlet 221, the bottom of the tower 220 is provided with a discharge outlet 222, the side wall of the tower 220 is provided with a flue gas inlet 223 and a flue gas outlet 224, and the flue gas outlet 224 is positioned above the adsorption bed 210. The inlet 221 is used for feeding new adsorbent into the tower 220, the outlet 222 is used for discharging the adsorbent saturated with adsorption at the bottom of the adsorbent bed 210, and the adsorbent bed 210 in the tower 220 gradually moves downwards. The flue gas distributor 100 is located below the adsorption bed 210, the flue gas inlet of the flue gas distributor 100 is communicated with the flue gas inlet 223, and the adsorbent in the adsorption bed 210 falls from the interval between two adjacent flue gas distribution pipes 110 and is discharged out of the tower body 210 from the discharge outlet 222.
The flue gas to be purified enters each flue gas distribution pipe 110 of the flue gas distributor 100 from the flue gas inlet 223 of the tower body 220, flows upwards through each flue gas distribution hole 130 of the flue gas distribution pipe 110, and uniformly enters the adsorption bed 210 to be contacted and adsorbed with the adsorbent. The adsorbent at the bottom of the adsorbent bed 210 falls from the gap between two adjacent flue gas distribution tubes 110 and is discharged from the discharge port 222. While new adsorbent is fed from feed inlet 221 into the top of adsorbent bed 210 as make-up. The cleaned flue gas after contaminant removal flows out of the top of the adsorbent bed 210 and exits the column 220 through a flue gas outlet 224 above the adsorbent bed 210.
A flue gas distributor 100 and an adsorption tower 200 having the same according to an embodiment of the present application will be described with reference to fig. 1 to 4.
As shown in fig. 1, the adsorption tower 200 includes a tower body 220 and a flue gas distributor 100. The top of the tower body 220 is provided with a feed inlet 221, the bottom is provided with a discharge outlet 222, and the side wall of the tower body 220 is provided with a flue gas inlet 223 and a flue gas outlet 224, wherein the flue gas outlet 224 is positioned above the flue gas inlet 223. The column 220 is filled with a movable adsorbent bed 210, and the adsorbent in the adsorbent bed 210 gradually moves downward.
As shown in fig. 1 and 2, the flue gas distributor 100 is disposed within the tower 220 below the adsorbent bed 210. Specifically, as shown in fig. 2, the flue gas distributor 100 includes a plurality of horizontally disposed flue gas distribution pipes 110, and two ends of the flue gas distribution pipes 110 in the extending direction thereof are respectively connected to opposite inner side wall surfaces of the tower 220 so as to be fixed inside the tower 220. The plurality of flue gas sub-pipes 110 are arranged at intervals along the first horizontal direction. In this embodiment, the first horizontal direction is perpendicular to the extending direction of the flue gas distribution tube 110.
As shown in fig. 3, the flue gas distribution pipe 110 is a circular pipe grid pipe, on which grid holes are uniformly distributed. The grid holes in the upper half of the flue gas distribution pipe 110 are flue gas distribution holes 130, and the grid holes in the lower half of the flue gas distribution pipe 110 are leakage holes 141. The flue gas distribution holes 130 have a smaller pore size than the adsorbent particles in the adsorbent bed 210 and the weep holes 141 have a larger pore size than the adsorbent particles in the adsorbent bed 210.
As shown in fig. 2 and 3, during the downward movement of the adsorption bed 210, most of the adsorbent falls from the interval between adjacent flue gas distribution tubes 110 due to the obstruction of the flue gas distribution tubes 110. When a small amount of small-particle-size adsorbent particles or adsorbent powder fall into the flue gas distribution pipe 110 from the flue gas distribution holes 130 on the flue gas distribution pipe 110, the adsorbent particles or adsorbent powder leak out from the leakage holes 141 with larger apertures at the bottom of the flue gas distribution pipe 110 due to the action of gravity, so that the flue gas distribution pipe 100 is prevented from being blocked.
As shown in fig. 2, the smoke distributing tube 110 is open at both a first end and a second end in the extending direction thereof, the first end forming a first smoke inlet 121 and the second end forming a second smoke inlet 122. As shown in fig. 1, a first flue gas inlet 2231 and a second flue gas inlet 2232 are provided on a side wall of the tower body 220, and the first flue gas inlet 2231 and the second flue gas inlet 2232 are opposite in the extending direction of the flue gas distribution tube 110. The first smoke inlet 2231 communicates with the first smoke inlet 121 and the second smoke inlet 2232 communicates with the second smoke inlet 122. The flue gas is simultaneously conveyed to the flue gas distribution pipes 110 through the flue gas inlets at two sides, so that the flue gas distribution is more uniform.
As shown in fig. 1 and 2, the tower body 220 is provided with an adsorption cavity 225 and a blanking cavity 226, the adsorption bed 210 is positioned in the adsorption cavity 225, the blanking cavity 226 is positioned below the adsorption cavity 225, and the discharge port 222 is positioned at the bottom of the blanking cavity 226 and is communicated with the same. The flue gas distributor 100 is located between the adsorption chamber 225 and the blanking chamber 226. During adsorption, the adsorbent of the mobile adsorbent bed 210 falls downwardly through the flue gas distributor 100 into the blanking chamber 226 and is discharged from the discharge port 222.
In order to more smoothly discharge the adsorbent in the discharge chamber 226 from the discharge port 222, the discharge port 222 is positioned at the bottom of the discharge chamber 226 such that the discharge chamber 226 is inverted cone-shaped as shown in fig. 1 and 2. A control valve 227 is arranged at the discharge port 222, and the speed of blanking is regulated by controlling the control valve 227.
Alternatively, the height of the adsorption tower 200 in the vertical direction of the embodiment of the present application is 3.0m to 6.0m. For example 3, 5 or 6 meters. Compared with an adsorption tower adopting a distributor and a blanking pipe, the adsorption tower 200 adopting the flue gas distributor 100 provided by the embodiment of the application has the advantages that the tower body height can be reduced by at least 1 meter, the reduction of the tower body height is beneficial to reducing the construction cost of the adsorption tower, and the structural stability of the tower body of the adsorption tower 200 is improved.
A smoke distributor 100 in another embodiment of the application is described below with reference to fig. 5 and 6.
The flue gas distribution pipe 110 is a circular pipe, and grid holes are distributed at the upper part of the flue gas distribution pipe 110, and the grid holes are flue gas distribution holes 130. As shown in fig. 5, the bottom of the flue gas distribution tube 110 is opened to form a long strip-shaped leakage groove 142, and the extending direction of the leakage groove 142 is the same as the extending direction of the flue gas distribution tube 110.
In the embodiment shown in fig. 6, the central angle corresponding to the material leakage groove 142 is 20 degrees, and the adsorbent particles and the adsorbent powder falling into the flue gas distribution tube 110 can be smoothly discharged from the flue gas distribution tube 110 through the material leakage groove 142 without affecting the structural strength of the flue gas distribution tube 110.
The flue gas low-temperature adsorption technology is to remove pollutant components from low-temperature flue gas through adsorption of an adsorbent. The inventors have found that in a low-temperature environment, usually at room temperature or lower, preferably at zero degrees celsius or lower, nitrogen oxides in flue gas undergo a low-temperature oxidation adsorption phenomenon on the surface of an adsorbent such as activated carbon, and nitrogen monoxide gas which is difficult to adsorb is oxidized into nitrogen dioxide gas which is easy to adsorb, so that the adsorption capacity can be increased by hundreds of times. In addition, the adsorption capacity of sulfur dioxide, carbon dioxide, heavy metals and the like is multiplied in a low-temperature environment.
However, the inventor realizes through research that when the low-temperature adsorption is adopted for flue gas purification treatment, the problem that the flue gas is unevenly distributed and the vertical size of the existing flue gas distribution structure is overlarge exists.
The embodiment of the application provides a low-temperature flue gas adsorption system. Specifically, the low temperature flue gas adsorption system includes a flue gas cooling device, an adsorption tower 200, and a regeneration tower. The flue gas cooling device is used for cooling the flue gas to room temperature or below, and the flue gas cooling device is communicated with the flue gas inlet of the adsorption tower 200, and the regeneration tower is used for regeneration of the adsorbent, and the discharge gate 222 of the adsorption tower 200 is communicated with the regeneration inlet of the regeneration tower, and the regeneration outlet of the regeneration tower is communicated with the feed inlet 221 of the adsorption tower 200.
The flue gas is cooled by the flue gas cooling device and becomes low-temperature flue gas, the low-temperature flue gas with the temperature at room temperature or below is input into the flue gas distributor 100 through the flue gas inlet 223, and the low-temperature flue gas upwards enters the adsorption bed 210 through the flue gas distributor 100 to be contacted with the adsorbent for low-temperature physical adsorption.
Preferably, the temperature of the low temperature flue gas is from-30 ℃ to-10 ℃. For example, the temperature of the low temperature flue gas is at-20 ℃ below zero or at-10 ℃.
The adsorbent saturated by adsorption at the bottom of the adsorbent bed 210 falls down from the gaps between the flue gas distribution pipes 100, is discharged from the discharge port 222 of the adsorption tower 200, and is fed into a regeneration tower to regenerate the adsorbent. In the regeneration tower, the adsorbent is heated for regeneration, and the pollutants adsorbed in the adsorbent are desorbed from the adsorbent to form regenerated gas, and the regenerated gas is subjected to subsequent treatment. The regenerated adsorbent is discharged from the regeneration outlet of the regeneration tower, and is introduced into the feed inlet 221 of the adsorption tower 200 as a supplement to the adsorption bed 210.
In the description of the present application, 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 application 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 application.
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 application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, 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 application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, 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 application. 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 application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, 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 application.
Claims (5)
1. A low temperature flue gas adsorption tower, comprising:
the tower body is internally provided with a movable adsorption bed, the top of the tower body is provided with a feed inlet, the bottom of the tower body is provided with a discharge outlet, the side wall of the tower body is provided with a flue gas inlet for enabling low-temperature flue gas at room temperature or below to enter the tower body and a flue gas outlet for discharging clean flue gas, and the flue gas outlet is positioned above the adsorption bed;
the flue gas distributor comprises a plurality of flue gas distribution pipes which are round pipes and are horizontally arranged, the flue gas distribution pipes are mutually parallel and are arranged at intervals along a first horizontal direction, the flue gas distribution pipes are provided with a first end and a second end which are opposite in the extending direction, the first end is opened to form a first flue gas inlet, the second end is opened to form a second flue gas inlet, the flue gas inlet comprises a first flue gas inlet and a second flue gas inlet, the first flue gas inlet is communicated with the first flue gas inlet, the second flue gas inlet is communicated with the second flue gas inlet, on the cross section of the flue gas distribution pipes, the flue gas distribution pipes are provided with a plurality of flue gas distribution holes positioned at the upper part of the flue gas distribution pipes, the interval between every two adjacent flue gas distribution pipes forms a channel for the falling of an adsorbent, the interval between every two adjacent flue gas distribution pipes is 50-80mm, the lower part of the flue gas distribution pipes is provided with a material outlet, the minimum size of the material outlet is larger than the particle size of the adsorbent, the particle size of the adsorbent is equal to 30 mm, the particle size of the adsorbent is equal to the particle size of the center of the diameter of the adsorbent, and the particle size is equal to the particle size of the adsorbent,
the flue gas distributor is arranged in the tower body and below the adsorption bed, a flue gas inlet of the flue gas distributor is communicated with the flue gas inlet, the adsorbent in the adsorption bed falls from the interval between two adjacent flue gas distribution pipes and is discharged out of the tower body from the discharge port,
the height of the flue gas distributor in the vertical direction is 80-300 mm, and the height of the adsorption tower in the vertical direction is 3.0-6.0 m.
2. The low temperature flue gas adsorption tower of claim 1, wherein the pores of the flue gas distribution holes are smaller than the adsorbent particle size to prevent the adsorbent from falling into the flue gas distribution tube through the flue gas distribution holes.
3. The low-temperature flue gas adsorption tower according to claim 1, wherein the flue gas distribution pipe is a grid-shaped pipe, the mesh holes at the upper part of the flue gas distribution pipe are the flue gas distribution holes, and the mesh holes at the lower part of the flue gas distribution pipe are the material leakage holes.
4. The low-temperature flue gas adsorption tower according to claim 1, wherein the bottom of the flue gas distribution pipe is opened to form a strip-shaped leaking port, and the extending direction of the leaking port is the same as the extending direction of the flue gas distribution pipe.
5. A low temperature flue gas adsorption system, comprising:
the flue gas cooling device is used for cooling the flue gas to room temperature or below;
a low-temperature flue gas adsorption tower, wherein the low-temperature flue gas adsorption tower is the low-temperature flue gas adsorption tower according to any one of claims 1-4, and a flue gas outlet of the flue gas cooling device is communicated with a flue gas inlet of the adsorption tower;
the regeneration tower is used for regenerating the adsorbent, the discharge port of the adsorption tower is communicated with the regeneration inlet of the regeneration tower, and the regeneration outlet of the regeneration tower is communicated with the feed inlet of the adsorption tower.
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| CN202310640161.6A CN116351197B (en) | 2023-06-01 | 2023-06-01 | Flue gas distributor, adsorption tower and low-temperature flue gas adsorption system |
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| CN117101337B (en) * | 2023-10-20 | 2024-02-13 | 中国华能集团清洁能源技术研究院有限公司 | Cooling low-temperature adsorption combined purifying device |
| CN117225142B (en) * | 2023-11-14 | 2024-02-13 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature adsorption tower with cooling function |
| CN117282228B (en) * | 2023-11-23 | 2024-03-08 | 中国华能集团清洁能源技术研究院有限公司 | Low-temperature flue gas adsorption tower and low-temperature flue gas adsorption system with flue gas flow guiding function |
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