CN112316662A - Activated carbon denitration tower - Google Patents
Activated carbon denitration tower Download PDFInfo
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- CN112316662A CN112316662A CN202011381008.9A CN202011381008A CN112316662A CN 112316662 A CN112316662 A CN 112316662A CN 202011381008 A CN202011381008 A CN 202011381008A CN 112316662 A CN112316662 A CN 112316662A
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- denitration
- activated carbon
- exhaust
- flue gas
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 127
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000003546 flue gas Substances 0.000 claims abstract description 93
- 239000007789 gas Substances 0.000 claims abstract description 57
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 24
- 230000023556 desulfurization Effects 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 239000012466 permeate Substances 0.000 claims abstract description 5
- 239000000428 dust Substances 0.000 description 11
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910052815 sulfur oxide Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/30—Sulfur compounds
- B01D2257/302—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The application provides an active carbon denitration tower. The activated carbon denitration tower is used for carrying out desulfurization and denitration treatment on flue gas, an air inlet area, a denitration area and an exhaust area are sequentially arranged on the denitration tower from inside to outside along the radial direction, the air inlet area is provided with at least one air inlet, the denitration area is filled with activated carbon, and the exhaust area is provided with an exhaust port; the flue gas enters the gas inlet area through the gas inlet along the vertical direction, permeates from the gas inlet area to the denitration area along the radial direction, and enters the exhaust area after being subjected to desulfurization and denitration by the activated carbon in the denitration area and is discharged from the exhaust port; and the permeation direction of the flue gas in the denitration area is vertical to the movement direction of the activated carbon in the denitration area.
Description
Technical Field
The application relates to the technical field of flue gas denitration equipment, in particular to an active carbon denitration tower.
Background
The importance of removing nitrogen oxides from combustion flue gas and preventing environmental pollution has become a sharp problem worldwide. The desulfurization and denitrification of the activated carbon are one of the currently common flue gas treatment methods, and sulfur dioxide adsorbed by the activated carbon can be effectively utilized and can be used for preparing sulfuric acid, ammonium sulfate, sodium metabisulfite and the like; the denitration by the activated carbon is the method with the lowest denitration temperature by the reduction method at present, but the flue gas emission dust after the desulfurization and the denitration by the activated carbon is extremely easy to exceed the standard due to the dust in the original flue gas and the dust generated by the activated carbon due to abrasion.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
An object of this application is to provide an active carbon denitration tower to solve or alleviate the problem that exists among the above-mentioned prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides an activated carbon denitration tower, which is used for carrying out desulfurization and denitration treatment on flue gas, wherein the denitration tower is sequentially provided with an air inlet area, a denitration area and an exhaust area from inside to outside along the radial direction, the air inlet area is provided with at least one air inlet, the denitration area is filled with activated carbon, and the exhaust area is provided with an exhaust port; the flue gas enters the gas inlet area through the gas inlet along the vertical direction, permeates from the gas inlet area to the denitration area along the radial direction, and enters the exhaust area after being subjected to desulfurization and denitration by the activated carbon in the denitration area and is discharged from the exhaust port; and the permeation direction of the flue gas in the denitration zone is vertical to the moving direction of the activated carbon in the denitration zone.
Optionally, in any embodiment of the present application, there is one of the air inlets; the air inlet is positioned at the top of the air inlet area, and the corresponding air outlet is positioned at the bottom of the outer side wall of the air outlet area; or the air inlet is positioned at the bottom of the air inlet area, and the air outlet is correspondingly positioned at the top of the outer side wall of the air exhaust area.
Optionally, in any embodiment of the present application, there are two of the air inlets, and the two air inlets are oppositely disposed and located at the top and the bottom of the air inlet area, respectively; correspondingly, the exhaust port is positioned in the middle of the outer side wall of the exhaust area.
Optionally, in any embodiment of the present application, an inlet cross section of the denitration region is smaller than an outlet cross section, and both the inlet and outlet cross sections of the denitration region are cylindrical surfaces.
Optionally, in any embodiment of the present application, the radial dimension of the exhaust area increases gradually along the flow direction of the flue gas in the exhaust area.
Optionally, in any embodiment of the present application, the axial cross-section of the exhaust area is triangular.
Optionally, in any embodiment of the present application, a flow guiding pressure equalizing body is arranged in the air inlet zone, and the radial dimension of the flow guiding pressure equalizing body gradually increases along the flow direction of the flue gas in the air inlet zone.
Optionally, in any embodiment of the present application, the air intake area is cylindrical, and the flow guide pressure equalizing body and the axis of the flow guide pressure equalizing body coincide with the axis of the air intake area.
Optionally, in any embodiment of the present application, the radial dimension of the inlet zone is tapered along the flow direction of the flue gas in the inlet zone.
Optionally, in any embodiment of the present application, the exhaust area is circular in cross-section.
Compared with the closest prior art, the technical scheme of the embodiment of the application has the following beneficial effects:
according to the technical scheme of the active denitration tower provided by the embodiment of the application, the denitration tower is sequentially provided with an air inlet area, a denitration area and an exhaust area from inside to outside along the radial direction; the denitration device comprises an air inlet area, an air outlet area, a denitration area and a denitration area, wherein the air inlet area is provided with at least one air inlet; the flue gas to be subjected to desulfurization and denitrification enters an air inlet area from an air inlet along the vertical direction, and permeates to a denitrification area along the radial direction in the air inlet area, and the flue gas permeating into the denitrification area enters an exhaust area after being subjected to desulfurization and denitrification by activated carbon and is discharged from an exhaust port; the active carbon enters from the top of the denitration area and moves from top to bottom, and the flue gas enters from the inner side surface of the denitration area and moves along the radial direction of the denitration area and is discharged from the outer side surface of the denitration area. The flow rate when the flue gas is discharged is reduced, and dust carrying is reduced, so that the emission standard of the dust can be reached after the denitration reaches the standard. Therefore, the flue gas and the activated carbon are subjected to desulfurization and denitrification in a cross flow mode, the effect of desulfurization and denitrification on the flue gas by the activated carbon in the denitrification area is effectively improved, and the flue gas discharged from the exhaust area meets the emission standard.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
fig. 1 is a schematic front view of an activated carbon denitration tower provided according to an embodiment of the present application;
FIG. 2 is a schematic top view of an activated carbon denitration tower provided in the embodiment shown in FIG. 1;
fig. 3 is a schematic structural diagram of another activated carbon denitration tower provided in accordance with some embodiments of the present application;
FIG. 4 is a schematic exterior view of an exhaust area and a diversion pressure equalizing body of an activated carbon denitration tower provided according to some embodiments of the present application;
fig. 5 is a schematic structural diagram of yet another activated carbon denitration tower provided in accordance with some embodiments of the present application.
Description of reference numerals:
101-an air inlet area; 111-an air inlet; 121-a flow guide pressure equalizing body; 102-a denitrification zone; 103-an exhaust area; 113-exhaust port.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
In the description of the present application, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present application but do not require that the present application must be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
Fig. 1 is a schematic front view of an activated carbon denitration tower provided according to an embodiment of the present application; FIG. 2 is a schematic top view of an activated carbon denitration tower provided in the embodiment shown in FIG. 1; as shown in fig. 1 and fig. 2, the activated carbon denitration tower is used for performing desulfurization and denitration treatment on flue gas, and the activated carbon denitration tower is provided with an air inlet area 101, a denitration area 102 and an exhaust area 103 in sequence from inside to outside along a radial direction; the air inlet area 101 is provided with at least one air inlet 111, the denitration area 102 is filled with activated carbon, and the exhaust area 103 is provided with an exhaust port 113; the flue gas enters the gas inlet area 101 through the gas inlet 111 along the vertical direction, and penetrates from the gas inlet area 101 to the denitration area 102 along the radial direction, and after the activated carbon in the denitration area 102 is subjected to desulfurization and denitration, the flue gas enters the exhaust area 103 and is discharged through the gas outlet 113; wherein the permeation direction of the flue gas in the denitration zone 102 is perpendicular to the moving direction of the activated carbon in the denitration zone 102. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, the activated carbon moves from top to bottom from the denitration region 102, and after the flue gas to be subjected to desulfurization and denitration by adding a denitration agent (generally ammonia gas) enters the gas inlet region 101, the activated carbon permeates from the denitration region 102 of the gas inlet region 101 in the radial direction; the permeation of the flue gas in the denitrification zone 102 and the activated carbon are performed in a cross-flow manner. The flue gas enters an exhaust area 103 after being desulfurized and denitrated by activated carbon in the inner diameter of the denitration area 102. Therefore, the effect of desulfurization and denitrification of the flue gas by the activated carbon in the denitrification area 102 is effectively improved. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
During design, the average speed of flue gas passing through the activated carbon is the same as that of a conventional activated carbon denitration tower, the inlet flue gas flow speed of the denitration area 102 in the design is higher than the conventional speed, the outlet flue gas is lower than the conventional speed, the flow speed of the flue gas during discharge is reduced, dust carrying is reduced, and therefore the flue gas can reach the dust emission standard after denitration reaches the standard.
In some alternative embodiments, there is one of the air inlets 111; the air inlet 111 is located at the top of the air inlet area 101, and correspondingly, the air outlet 113 is located at the bottom of the outer side wall of the air outlet area 103; alternatively, the air inlet 111 is located at the bottom of the air inlet area 101, and correspondingly, the air outlet 113 is located at the top of the outer sidewall of the air outlet area 103. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, when the gas inlet 111 is disposed at the top of the gas inlet area 101 and the gas outlet 113 is disposed at the bottom of the outer sidewall of the gas outlet area 103, the flue gas enters the gas inlet area 101 through the gas inlet 111 and moves from top to bottom in the gas inlet area 101, and the flue gas after desulfurization and denitrification moves from top to bottom in the gas outlet area 103 and is discharged through the gas outlet 113; or, when the gas inlet 111 is arranged at the bottom of the gas inlet area 101 and the gas outlet 113 is arranged at the top of the outer side wall of the gas outlet area 103, the flue gas enters the gas inlet area 101 through the gas inlet 111 and moves from bottom to top in the gas inlet area 101, and the flue gas after desulfurization and denitrification moves from bottom to top in the gas outlet area 103 and is discharged through the gas outlet 113. Therefore, the flue gas at each height can uniformly pass through the activated carbon layer, and the flue gas is discharged from the exhaust port 113 after being sufficiently desulfurized and denitrated by the activated carbon. If the air inlet 111 and the air outlet 113 are at the same height, the flue gas can form a short circuit at the height, the flue gas throughput at the height is greatly increased, the flow rate is also increased, the contact time of the flue gas and the activated carbon is reduced, the denitration is insufficient, the height far away from the inlet and the outlet is far away, the flue gas passing rate is greatly reduced, namely different heights cannot obtain the same pressure drop, the denitration is uneven, and the nitrogen oxide is generated. The method aims to ensure that the pressure drop of inlet and outlet flue gas in the radial direction of each area is the same, so that the flue gas can uniformly pass through the denitration layer, and if other modes can meet the requirement, the outlet position is not limited. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In some alternative embodiments, there are two air inlets 111, and the two air inlets 111 are oppositely disposed and respectively located at the top and the bottom of the air inlet region 101; correspondingly, the exhaust port 113 is located in the middle of the outer side wall of the exhaust area 103. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, by providing two opposite air inlets 111 at the top and the bottom of the air intake region 101, the flue gas enters the air intake region 101 from the top and the bottom of the air intake region 101, and flows from the top and the bottom of the air intake region 101 to the middle of the air intake region 101; the exhaust port 113 is arranged in the middle of the outer side wall of the exhaust area 103, so that the desulfurized and denitrated flue gas flows from the top and the bottom of the exhaust area 103 to the middle and is exhausted through the exhaust port 113. Therefore, the residence time of the flue gas to be subjected to desulfurization and denitrification in the denitrification area 102 is fully increased, the desulfurization and denitrification effects of the activated carbon in the denitrification area 102 on the flue gas are further improved, and the flue gas discharged from the exhaust area 103 meets the emission standard. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In some alternative embodiments, the radial dimension of the exhaust area 103 increases gradually along the flow direction of the flue gas in the exhaust area 103. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention. The central axis of the outer wall of a given exhaust area 103 is parabolic in cross-section, ensuring that the area of the cross-section is proportional to the height. In actual construction, the shell is formed by adopting various cones, so that an approximately parabolic structure is formed, and a cone can be made to be similar to and coincide with most of the area of a parabola. The air inlet area 101 is added with a flow guiding pressure equalizing body 121 which is also in a parabolic structure. In actual construction, the shell is formed by adopting various cones, so that an approximately parabolic structure is formed, and a cone can be made to be similar to and coincide with most of the area of a parabola. The sum of the cross-sectional areas of the intake area 101 and the exhaust area 103 at the same height is equal. The flow guiding pressure equalizing body 121 of the inlet area 101 may also be roughly regarded as a cone.
In this application embodiment, when the flue gas passes through the activated carbon layer, along with being close to the exhaust area, the charcoal layer sectional area crescent that the flue gas passed through, when the flue gas enters into the exhaust area, the flue gas velocity of flow reduces, has effectively reduced the dust of taking away when the flue gas is discharged, and the flue gas from exhaust area 103 exhaust satisfies emission standard. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In a specific example, the axial cross-section of the exhaust area 103 is triangular. The outer side of the exhaust area 103 is preferably parabolic to ensure that the cross-section of the exhaust area at each level is proportional to the amount of exhaust already taken, and when the apparatus is large enough, the parabola is approximately a straight line, and can be replaced by a straight line so that the axial cross-section of the exhaust area 103 is approximately triangular. As shown in fig. 4, the parabola of the axial cross section of the exhaust area 103 is shown in the following equation (1):
wherein, X0、X1Radial directions of the inside and outside of the denitration zone along the X axis (horizontal direction); y is0The height of the denitration tower along the Y axis (vertical direction).
The gas discharged from the bottom of the exhaust area 103 moves upward to a certain height, and the gas is discharged from the height, and the gas continues to move upward after being mixed, and so on, and finally reaches the top of the exhaust area 103, and the gas enters the exhaust port 113.
In the embodiment of the present application, the axial cross section of the exhaust area 103 is approximately triangular, thereby facilitating the maintenance and construction. In other embodiments, the axial cross-section of the exhaust area 103 may also be rectangular.
In the embodiment of the present application, the air inlet region 101, the denitration region 102, and the exhaust region 103 are sequentially disposed from inside to outside along the radial direction of the denitration tower, and the whole denitration tower is shaped like a circular truncated cone (if the outer wall of the exhaust region 103 is replaced by a cone, the outer wall is shaped like a circular truncated cone). The center of the circular table is provided with an air inlet area 101 along the axial direction, the air inlet area 101 is cylindrical, a flow guide pressure equalizing body 121 can be arranged in the circular table, and an air inlet 111 is arranged at the small end of the circular table; the periphery of the air inlet area 101 is provided with a denitration area 102, the cross section of the denitration area 102 is annular, the diameter of the outer ring of the denitration area 102 is smaller than or equal to the diameter of the small end of the circular truncated cone-shaped desulfurization and denitration tower, and the diameter of the inner ring of the denitration area 102 is the same as that of the cylindrical air inlet area 101; and the exhaust area 103 is arranged between the outer side wall of the denitration area 102 and the outer side wall of the circular truncated cone, the exhaust port 113 is arranged at the large end of the circular truncated cone along the radial direction, and the axial cross section between the outer side wall of the denitration area 102 and the outer side wall of the circular truncated cone is triangular. Therefore, the flow speed of the flue gas subjected to desulfurization and denitrification in the exhaust area 103 is effectively reduced, dust taken away when the flue gas is discharged is reduced, and the flue gas discharged from the exhaust area 103 meets the emission standard. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
Fig. 3 is a schematic structural diagram of another activated carbon denitration tower provided in accordance with some embodiments of the present application; as shown in fig. 3, in the denitration tower, a flow guide pressure equalizing body 121 is arranged in the gas inlet area 101, and the radial dimension of the flow guide pressure equalizing body 121 gradually increases along the flow direction of the flue gas in the gas inlet area 101. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the application, the axial section of the flow-guiding pressure-equalizing body 121 is optimally a parabola, which can be combined by various cones to form an approximate parabola, and can be replaced by a cone when the axial section is thicker. As shown in fig. 4, the parabola of the axial cross section of the flow guiding pressure equalizing body 121 is shown in the following formula (2):
in this embodiment, because the exhaust port 113 and the air inlet 111 are located at two ends of the denitration tower respectively, when the radial dimension of the diversion pressure equalizing body 121 is gradually increased along the flow direction of the flue gas, the large end of the diversion pressure equalizing body 121 and the exhaust port 113 are located at the same side of the denitration tower, and the flue gas after desulfurization and denitration entering the denitration region 102 from the large end of the diversion pressure equalizing body 121 is discharged from the exhaust port 113 in a short time. Therefore through setting up water conservancy diversion pressure-equalizing body 121, the flue gas that makes the SOx/NOx control carry out flows along water conservancy diversion pressure-equalizing body 121's lateral wall in air inlet region 101, shunts the flue gas, makes from the tip of water conservancy diversion pressure-equalizing body 121 to the main aspects, and the volume of the SOx/NOx control flue gas of every height that gets into denitration district 102 is the same, helps fully SOx/NOx control in denitration district 102 through the SOx/NOx control of water conservancy diversion pressure-equalizing body 121 main aspects entering denitration district 102. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In a specific example, the air intake area 101 is cylindrical, the diversion pressure equalizing body 121 is preferably parabolic, multiple cones can be spliced to form a similar parabolic shape in engineering, the diversion pressure equalizing body can also be conical in rough consideration, and the axis of the diversion pressure equalizing body 121 coincides with the axis of the air intake area 101. Therefore, the pressure equalizing effect on the flue gas is better, and the flue gas is more balanced when being subjected to desulfurization and denitrification in the denitrification area 102. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
Fig. 5 is a schematic structural diagram of yet another activated carbon denitration tower provided in accordance with some embodiments of the present application; as shown in fig. 5, in the denitration tower, the radial dimension of the gas inlet zone 101 gradually decreases along the flow direction of the flue gas in the gas inlet zone 101. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, the denitration tower is cylindrical as a whole, that is, the outer sidewall of the exhaust area 103 is cylindrical; because gas vent 113 and air inlet 111 set up respectively at the both ends of denitration tower, through making the radial dimension of intake zone 101 dwindle along the flow direction of flue gas in intake zone 101 gradually, the volume of the flue gas that makes the intake zone 101 tip carry out SOx/NOx control is less, helps the flue gas when carrying out SOx/NOx control in denitration district 102 more balanced. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In some alternative embodiments, the cross-section of the exhaust area 103 is a circular ring; the cross section of the exhaust port 113 in the direction perpendicular to the smoke discharge direction is rectangular. Thereby facilitating the manufacture of the exhaust port 113 in the exhaust area 103. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In some alternative embodiments, the area of the first cross-section of the exhaust area 103 is greater than the area of the second cross-section of the inlet 111; the first cross section is a cross section of the exhaust port 113 along a direction perpendicular to the direction of the exhaust of the flue gas, and the second cross section is a cross section of the gas inlet 111 along a direction of the flue gas entering the exhaust area 103. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, the section of the flue gas entering the activated carbon denitration zone 102 from the inlet zone 101 is the product of the inlet perimeter and the height of the denitration tower, the section of the flue gas entering the exhaust zone 103 from the activated carbon denitration zone 102 is the product of the outlet inner wall perimeter and the height of the denitration tower, the perimeter is pi d (d is the diameter), and the outlet diameter is greater than the inlet diameter, so the inlet section of the activated carbon denitration zone 102 is smaller than the outlet section, and the speed of the flue gas exiting the activated carbon denitration zone 102 is smaller than the speed of the flue gas entering the activated carbon denitration zone 102. Therefore, dust carried away when the flue gas is discharged is reduced, and the flue gas discharged from the exhaust area 103 meets the emission standard. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
In the embodiment of the present application, no matter whether the denitration tower is cylindrical or truncated cone-shaped, the effective air intake surface area of the air intake area 101 is smaller than the effective air exhaust surface area of the air exhaust area 103, that is, the air intake surface area is smaller than the air exhaust surface area. For example, when the height of the denitration tower is H, the diameter of the cross section of the gas inlet area 101 is D (i.e., the inner diameter of the denitration area 102 is D), and the diameter of the cross section of the gas outlet area 103 is D (i.e., the outer diameter of the denitration area 102 is D), the surface area of the inner ring of the denitration area 102 is pi × D × H, and the surface area of the outer ring of the denitration area 102 is pi × D × H, because the surface area of the inner ring of the denitration area 102 is smaller than the surface area of the outer ring thereof, the flow speed of the flue gas in the inner ring of the denitration area 102 is faster, and the flow speed of the flue gas in the outer ring of the denitration area 102 is slower, and when the flue gas is discharged from the denitration area 102 to the gas outlet area 103 at a lower speed, the. Therefore, the flue gas can be fully ensured to enter the exhaust area 103 from the denitration area 102 at a lower speed, the dust taken away when the flue gas is discharged is reduced, and the flue gas discharged from the exhaust area 103 meets the emission standard. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An active carbon denitration tower is used for carrying out desulfurization and denitration treatment on flue gas and is characterized in that the denitration tower is sequentially provided with an air inlet area, a denitration area and an exhaust area from inside to outside along the radial direction,
the air inlet area is provided with at least one air inlet, the denitration area is filled with activated carbon, and the exhaust area is provided with an exhaust port;
the flue gas enters the gas inlet area through the gas inlet along the vertical direction, permeates from the gas inlet area to the denitration area along the radial direction, and enters the exhaust area after being subjected to desulfurization and denitration by the activated carbon in the denitration area and is discharged from the exhaust port;
and the permeation direction of the flue gas in the denitration area is vertical to the movement direction of the activated carbon in the denitration area.
2. The activated carbon denitration tower of claim 1, wherein one of the gas inlets;
the air inlet is positioned at the top of the air inlet area, and the corresponding air outlet is positioned at the bottom of the outer side wall of the air outlet area;
alternatively, the first and second electrodes may be,
the air inlet is located the bottom of intake zone, and corresponding, the gas vent is located the top of the lateral wall of exhaust zone.
3. The activated carbon denitration tower of claim 1, wherein there are two of the gas inlets, and the two gas inlets are oppositely arranged and respectively located at the top and the bottom of the gas inlet area;
correspondingly, the exhaust port is positioned in the middle of the outer side wall of the exhaust area.
4. The activated carbon denitration tower of claim 1, wherein the inlet cross section of the denitration zone is smaller than the outlet cross section;
preferably, the inlet and outlet sections of the denitration zone are cylindrical surfaces.
5. The activated carbon denitration tower of claim 1, wherein a radial dimension of the exhaust zone gradually increases along a flow direction of the flue gas in the exhaust zone.
6. The activated carbon denitration tower of claim 5, wherein the axial cross section of the exhaust area is triangular.
7. The activated carbon denitration tower of claim 1, wherein a flow guide pressure equalizing body is arranged in the gas inlet zone, and the radial dimension of the flow guide pressure equalizing body is gradually increased along the flowing direction of the flue gas in the gas inlet zone.
8. The activated carbon denitration tower of claim 7, wherein the gas inlet area is cylindrical, and the flow guide pressure equalizing body has an axis coinciding with an axis of the gas inlet area.
9. The activated carbon denitration tower of claim 1, wherein a radial dimension of the gas inlet zone is gradually reduced along a flow direction of the flue gas in the gas inlet zone.
10. The activated carbon denitration tower of any one of claims 1 to 9, wherein the cross section of the exhaust area is a circular ring.
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| CN202011381008.9A CN112316662A (en) | 2020-11-30 | 2020-11-30 | Activated carbon denitration tower |
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