CN113915632B - Flue assembly - Google Patents
Flue assembly Download PDFInfo
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- CN113915632B CN113915632B CN202111052001.7A CN202111052001A CN113915632B CN 113915632 B CN113915632 B CN 113915632B CN 202111052001 A CN202111052001 A CN 202111052001A CN 113915632 B CN113915632 B CN 113915632B
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- flue
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- pipe
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000003546 flue gas Substances 0.000 claims abstract description 61
- 239000002184 metal Substances 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 239000000779 smoke Substances 0.000 description 9
- 206010022000 influenza Diseases 0.000 description 7
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
- F23J11/12—Smoke conduit systems for factories or large buildings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/04—Joints; Connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2213/00—Chimneys or flues
- F23J2213/20—Joints; Connections
- F23J2213/201—Joints; Connections between stack and branch pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/11001—Conducting systems with a gas flow bypass from main flue to an auxiliary flue
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/13003—Means for reducing the noise in smoke conducing ducts or systems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a flue assembly, which comprises a pipe body, wherein a main flue for flue gas flow is arranged in the pipe body, the pipe body comprises a first pipe section, a second pipe section and a third pipe section which are sequentially communicated in the length direction of the pipe body, the first pipe section, the second pipe section and the third pipe section form the main flue, the second pipe section comprises a first straight section and a first arc section, one end of the first arc section is communicated with the first pipe section, the other end of the first arc section is communicated with one end of the first straight section, the third pipe section comprises a second straight section and a second arc section, one end of the second arc section is communicated with the other end of the first straight section, and the other end of the second arc section is communicated with one end of the second straight section. The flue assembly can reduce the resistance of the main flue and reduce the equipment vibration and noise caused by unstable air flow.
Description
Technical Field
The invention relates to the technical field of induced fans, in particular to a flue assembly.
Background
With the continuous improvement of environmental protection standards, most power plants are transformed with ultra-low emission. When a plurality of power plants are newly added with equipment, the connection of the main flue is disordered and complicated due to the limitation of field space, so that the problems of airflow opposite flushing, airflow pulsation and the like are caused due to unbalance of the flue gas flow field in the main flue, and finally the vibration of the main flue and the equipment is caused.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
Disclosed in the related art is a flue assembly comprising: a main flue; a first main flue; a second main flue; a third main flue; the first main flue, the second main flue and the third main flue are communicated with the main flue through the communicated main flue, the first main flue is positioned at the first side of the main flue, and the second main flue and the third main flue are positioned at the second side of the main flue; the first guide plate is arranged in the main communicating flue and separates the flue gas entering the main communicating flue from the second main flue from the flue gas entering the main communicating flue from the third main flue. The flue assembly in the related art can reduce the air flow disturbance in the main flue. However, the present inventors have found that the flue gas assembly in the related art disperses the air flow through three main flues, however, the three main flues are respectively converged to the main flues, the air flow in the main flues is unstable due to different flow rates and flow rates of the flue gas in the three main flues, and if the flow rates in the three main flues are distributed to achieve the effect of stabilizing the flow rates in the main flues, an air flow distribution component needs to be added, so that the equipment investment cost is increased.
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a smoke assembly which can reduce the resistance of a main flue and lighten equipment vibration and noise caused by unstable air flow.
The flue assembly comprises a pipe body, wherein a main flue for flue gas flow is arranged in the pipe body, the pipe body comprises a first pipe section, a second pipe section, a third pipe section and a reducing pipe section which are sequentially communicated in the length direction of the pipe body, the first pipe section, the second pipe section, the third pipe section and the reducing pipe section form the main flue, the second pipe section comprises a first straight Duan Duan and a first arc-shaped section, one end of the first arc-shaped section is communicated with the first pipe section, the other end of the first arc-shaped section is communicated with one end of the first straight section, the third pipe section comprises a second straight section and a second arc-shaped section, one end of the second arc-shaped section is communicated with the other end of the first straight section, the other end of the second arc-shaped section is communicated with one end of the second straight section, the reducing pipe section is communicated with the other end of the second straight section, and the flow area of the reducing pipe section is gradually reduced in the length direction of the pipe body.
According to the flue assembly provided by the embodiment of the invention, the resistance of the main flue can be reduced, and the equipment vibration and noise caused by unstable air flow can be reduced.
In some embodiments, the first pipe section is relatively provided with a first end face and a second end face in the length direction of the pipe body, the first pipe section is relatively provided with a first side face and a second side face in the thickness direction of the pipe body, a first preset included angle is formed between the first end face of the first pipe section and the first side face of the first pipe section, and a second preset included angle is formed between the first end face of the first pipe section and the second side face of the first pipe section.
In some embodiments, the first predetermined included angle is α 1 and 70+.alpha 1 +.80, and the second predetermined included angle is α 2 and 40+.alpha 2 +.ltoreq.50.
In some embodiments, the first arc section is relatively provided with a first end face and a second end face in the thickness direction of the pipe body, the first end face of the first arc section is an inward concave arc face facing the main flue, the curvature radius of the first end face of the first arc section is R 1, and 1500mm is less than or equal to R 1 is less than or equal to 6000mm, the second end face of the second arc section is an outward convex arc face far away from the main flue, and the curvature radius of the second end face of the second arc section is R 2, and 1000mm is less than or equal to R 2 is less than or equal to 5000mm.
In some embodiments, the second arc section has a first end face and a second end face arranged relatively in the thickness direction of the pipe body, the first end face of the second arc section is an outwards convex arc face far away from the main flue, the radius of curvature of the first end face of the second arc section is R 3, and 2000mm is less than or equal to R 3 is less than or equal to 6000mm, the second end face of the second arc section is an inwards concave arc face facing the main flue, and the radius of curvature of the second end face of the second arc section is R 4, and 500mm is less than or equal to R 4 is less than or equal to 1500mm.
In some embodiments, the flue assembly further includes a plurality of deflectors, the plurality of deflectors are respectively disposed in the pipe body, the plurality of deflectors are disposed in the second arc-shaped section, the plurality of deflectors are arranged at intervals in the thickness direction of the pipe body, and the plurality of deflectors divide the flue in the second arc-shaped section into a plurality of flue branches.
In some embodiments, the plurality of guide plates each include a first straight line portion, an arc portion, and a second straight line portion that are sequentially connected in the length direction of the pipe body, an extension direction of each first straight line portion is parallel to an extension direction of the first straight section, each second straight line portion is parallel to an extension direction of the second straight section, and the arc portion is an arc surface that is far away from an outer protrusion of the main flue.
In some embodiments, the second arc-shaped section is relatively provided with a first side and a second side in the length direction of the pipe body, the first straight line portion is relatively provided with a first end and a second end in the length direction of the pipe body, the first end of the first straight line portion is flush with the first side of the second arc-shaped section, the first straight line portions are uniformly spaced in the thickness direction of the pipe body, the second straight line portion is relatively provided with the first end and the second end in the length direction of the pipe body, the second end of the second straight line portion is flush with the second side of the second arc-shaped section, and the second straight line portions are uniformly spaced in the thickness direction of the pipe body.
In some embodiments, the flue assembly further includes a first metal compensator connected between the first pipe section and the second pipe section.
In some embodiments, the flue assembly further includes a second metal compensator connected between the second pipe section and a third pipe section.
Drawings
FIG. 1 is a schematic view of a flue assembly according to an embodiment of the present invention.
Fig. 2 is a schematic front view of the flue assembly shown in fig. 1.
FIG. 3 is a schematic view of the first tube section of the flue assembly according to an embodiment of the present invention.
FIG. 4 is a schematic view of a second arcuate segment of a flue assembly in accordance with an embodiment of the present invention mated with a deflector.
FIG. 5 is a schematic illustration of a flue assembly in connection with a denitration device and an air preheater in accordance with an embodiment of the present invention.
Reference numerals:
The pipe body 1, the first pipe section 11, the first end face 111 of the first pipe section, the first side face 112 of the first pipe section, the second side face 113 of the first pipe section,
The second pipe segment 12, the first straight segment 121, the first arcuate segment 122, the first end 1221 of the first arcuate segment, the second end 1222 of the first arcuate segment,
A third pipe segment 13, a second straight segment 131, a second arcuate segment 132, a first end 1321 of the second arcuate segment, a second end 1322 of the second arcuate segment, a first side 1323 of the second arcuate segment, a second side 1324 of the second arcuate segment,
The length of the variable diameter pipe section 14,
The deflector 2, the first straight portion 21, the curved portion 22, the second straight portion 23,
A first metal compensator 3, a second metal compensator 4, a denitration device 5 and an air preheater 6.
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.
As shown in fig. 1 to 4, a flue assembly according to an embodiment of the present invention includes a duct body 1.
The pipe body 1 is internally provided with a main flue for flue gas flow, and the pipe body 1 comprises a first pipe section 11, a second pipe section 12 and a third pipe section 13 which are sequentially communicated in the length direction (up-down direction as shown in fig. 1) of the pipe body, the first pipe section 11, the second pipe section 12 and the third pipe section 13 form the main flue, the second pipe section 12 comprises a first straight section 121 and a first arc section 122, one end of the first arc section 122 is communicated with the first pipe section 11, the other end of the first arc section 122 is communicated with one end of the first straight section 121, the third pipe section 13 comprises a second straight section 131 and a second arc section 132, one end of the second arc section 132 is communicated with the other end of the first straight section 121, and the other end of the second arc section 132 is communicated with one end of the second straight section 131.
The first pipe section 11, the second pipe section 12, and the third pipe section 13 are sequentially connected in the direction of the flow of the flue gas, for example, the flow direction of the flue gas is from top to bottom, the first pipe section 11, the second pipe section 12, and the third pipe section 13 are sequentially connected in the up-down direction, and if the flow direction of the flue gas is from left to right, the first pipe section 11, the second pipe section 12, and the third pipe section 13 are sequentially connected in the left-right direction.
Specifically, as shown in fig. 1, the first pipe section 11 is provided with a first flue, the second pipe section 12 is provided with a second flue, the third pipe section 13 is provided with a third flue, the first flue, the second flue and the third flue are mutually communicated, and the first flue, the second flue and the third flue form a main flue. The flow area of the first flue is larger than that of the second flue, the flow area of the second flue is smaller than that of the third flue, and the flow area of the third flue is smaller than that of the first flue. The flow area of the first flue is gradually reduced in the length direction of the pipe body.
The upper end of the first arc-shaped section 122 is communicated with the lower end of the first pipe section 11, the lower end of the first arc-shaped section 122 is communicated with the upper end of the first straight section 121, the lower end of the first straight section 121 is communicated with the upper end of the second arc-shaped section 132, and the lower end of the second arc-shaped section 132 is communicated with the upper end of the second straight section 131. The first straight section 121 is arranged obliquely from right to left in the up-and-down direction, and the second straight section 131 is arranged vertically in the up-and-down direction.
According to the flue assembly provided by the embodiment of the invention, the first pipe section 11, the second pipe section 12 and the third pipe section 13 are arranged, so that the flue gas is transferred step by step, and the flue gas is stably transited through the first arc-shaped section 122 and the second arc-shaped section 132, so that the resistance of the main flue can be reduced, and the equipment vibration and noise caused by unstable air flow are reduced. The flow area of the first flue is larger than that of the second flue, so that the first flue can temporarily store the flue gas to slow down the pressure and the flow rate of the flue gas entering the main flue, the flue blockage caused by a large amount of flue gas flowing into the flue is avoided, the flow area of the second flue is minimum, the flue gas in the first flue can be compressed, the flow rate and the pressure of the flue gas entering the third flue are improved, and the third flue is suitable for being communicated with external equipment, so that the pressure and the flow rate of the flue gas entering the external equipment are ensured.
In some embodiments, the first pipe segment 11 is relatively disposed with a first end face (an upper end face of the first pipe segment 11 as shown in fig. 2) and a second end face in a length direction of the pipe body 1, the first pipe segment 11 is relatively disposed with a first side (a left side face of the first pipe segment 11 as shown in fig. 2) and a second side face (a right side face of the first pipe segment 11 as shown in fig. 2) in a thickness direction of the pipe body 1, a first preset included angle is formed between the first end face 111 of the first pipe segment and the first side face 112 of the first pipe segment, and a second preset included angle is formed between the first end face 111 of the first pipe segment and the second side face 113 of the first pipe segment.
Specifically, as shown in fig. 2, a first preset included angle is formed between the upper end surface of the first pipe section 11 and the left side surface of the first pipe section 11, and a second preset included angle is formed between the upper end surface of the first pipe section 11 and the right side surface of the first pipe section 11. The dimension of the left side face of the first pipe section 11 in the up-down direction is smaller than the dimension of the right side face of the first pipe section 11 in the up-down direction.
According to the flue assembly provided by the embodiment of the invention, the upper end face of the first pipe section 11 and the left side face of the first pipe section 11 form an included angle, the upper end face of the first pipe section 11 and the right side face of the first pipe section 11 form an included angle, the dimension of the left side face of the first pipe section 11 in the up-down direction is smaller than that of the right side face of the first pipe section 11 in the up-down direction, and gas vortex of flue gas in the first pipe section 11 is avoided, so that the resistance of the flue gas to the flue gas is reduced.
In some embodiments, the first predetermined included angle is α 1 and 70+.alpha. 1 +.80, and the second predetermined included angle is 40+.alpha. 2 +.50.
Specifically, the first preset included angle α 1 may be 70 °, 72 °, 75 °, 76 °, 78 °, 79 ° or 80 °. The second preset included angle α 2 may be 40 °, 42 °, 45 °, 46 °, 48 °, 49 °, or 50 °. It can be appreciated that the first preset included angle and the second preset included angle can be adjusted according to the type of the flue gas.
According to the flue assembly provided by the embodiment of the invention, when the first preset included angle is 70 degrees or more and is not more than 1 degrees or less than 80 degrees, and the second preset included angle is 40 degrees or more and is not more than 2 degrees or less than 50 degrees, the interference of the flue on the flow of the flue is avoided, namely the resistance of the flue to the flow of the flue is reduced, the flue in the first flue can be enabled to enter the second flue more stably, and the flue vibration and equipment vibration caused by unstable flue flow are avoided.
In some embodiments, the first arc-shaped section 122 is relatively provided with a first end face and a second end face in the thickness direction of the pipe body 1, the first end face 1221 of the first arc-shaped section is an inward concave arc face facing the main flue, the radius of curvature of the first end face 1221 of the first arc-shaped section is R 1, and 1500 mm.ltoreq.R 1.ltoreq.6000 mm, the second end face 1322 of the second arc-shaped section is an outward convex arc face far away from the main flue, the radius of curvature of the second end face 1322 of the second arc-shaped section is R 2, and 1000 mm.ltoreq.R 2.ltoreq.5000 mm.
Specifically, as shown in fig. 1, the left end face of the first arc-shaped section 122 is an arc face concave towards the inner direction of the main flue, the inner side of the left end face of the first arc-shaped section 122 is flush with the inner side of the left end face of the first pipe section 11, the right end face of the first arc-shaped section 122 is an arc face convex towards the outer direction of the main flue, and the inner side of the right end face of the first arc-shaped section 122 is flush with the inner side of the right end face of the first pipe section 11, so that the resistance of flue gas flowing from the first flue to the second flue is reduced.
By way of example, the radius of curvature R 1 of the left end face of the first arcuate segment 122 may be 1500mm, 1550mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm, 5500mm, 6000mm. The radius of curvature R 2 of the right end face of the first arcuate segment 122 may be 1000mm, 1500mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm.
According to the flue assembly provided by the embodiment of the invention, when the left end face of the first arc-shaped section 122 is an arc face, the curvature radius of the left end face of the first arc-shaped section 122 is 1500mm or more and is less than or equal to R 1 mm or less and is 6000mm, the left end face of the second arc-shaped section 132 is an arc face, and the curvature radius of the right end face of the first arc-shaped section 122 is 1000mm or more and is less than or equal to R 2 mm or less and is 5000mm, gas vortex can be avoided from being generated at the joint of the first flue and the second flue when flue gas in the first flue enters the second flue, so that the resistance of the flue gas to the flue gas is reduced, the flow of the flue gas in the main flue is more stable, and the vibration and noise of the flue are reduced.
In some embodiments, the second arc-shaped segment 132 has a first end face and a second end face oppositely arranged in the thickness direction of the pipe body 1, the first end face 1321 of the second arc-shaped segment is an outwards convex arc face far away from the main flue, the radius of curvature of the first end face 1321 of the second arc-shaped segment is R 3, and 2000mm R 3 is 6000mm, the second end face 1322 of the second arc-shaped segment is an inwards concave arc face towards the main flue, the radius of curvature of the second end face 1322 of the second arc-shaped segment is R 4, and 500mm R 4 is 1500mm.
Specifically, as shown in fig. 1, the left end face of the second arc-shaped section 132 is an arc face that is concave outwards towards the external direction of the main flue, and the inner side of the left end face of the second arc-shaped section 132 is flush with the inner side of the left end face of the first straight section 121, the right end face of the second arc-shaped section 132 is an arc face that is concave inwards towards the internal direction of the main flue, and the inner side of the right end face of the second arc-shaped section 132 is flush with the inner side of the right end face of the first straight section 121, so that the resistance of the flue gas flowing from the second flue to the third flue is reduced.
By way of example, the radius of curvature R 3 of the left end face of the second arcuate segment 132 may be 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm, 5500mm, 6000mm. The radius of curvature R 4 of the right end face of the second arcuate segment 132 may be 500mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 1000mm, 1200mm, 1500mm.
According to the flue assembly provided by the embodiment of the invention, when the left end face of the second arc-shaped section 132 is an arc face, the curvature radius of the left end face of the second arc-shaped section 132 is 2000mm or less and R 3 mm or less and 6000mm, the left end face of the second arc-shaped section 132 is an arc face, and the curvature radius of the right end face of the second arc-shaped section 132 is 500mm or less and R 4 mm or less, gas vortex can be prevented from being generated at the joint of the second flue and the third flue when flue gas in the second flue enters the third flue, so that the resistance of the flue gas to the flue gas is reduced, the flow of the flue gas in the main flue is more stable, and the vibration and noise of the flue are reduced.
In some embodiments, the flue assembly further includes a plurality of deflectors 2, the plurality of deflectors 2 are respectively disposed in the pipe body 1, and the plurality of deflectors 2 are located in the second arc-shaped section 132, the plurality of deflectors 2 are arranged at intervals in the thickness direction of the pipe body 1 (left-right direction as shown in fig. 3), and the plurality of deflectors 2 divide the flue in the second arc-shaped section 132 into a plurality of flue branches.
Specifically, as shown in fig. 1 and 4, the front and rear ends of the plurality of baffle plates 2 are respectively connected to the inner wall surface of the pipe body 1, the plurality of baffle plates 2 are arranged at intervals in the left-right direction, the third flue is divided into a plurality of independent flue branches by the plurality of deflectors 2, and when the number of the deflectors 2 is N, the third flue is divided into n+1 flue branches. The size of the plurality of guide plates 2 in the up-down direction gradually increases from right to left.
According to the flue assembly provided by the embodiment of the invention, the plurality of guide plates 2 are arranged, so that the flue gas in the third flue can be split, the distribution of the flue gas flowing out of the third flue can be more uniform, the flow field of the flue gas in the third pipe section 13 can be uniformly distributed, and abnormal noise and low-frequency vibration of the flue caused by nonuniform airflow in the flowing process can be reduced.
In some embodiments, the plurality of deflectors 2 each include a first straight portion 21, an arc portion 22 and a second straight portion 23 sequentially connected in the length direction of the tube body, the extending direction of each first straight portion 21 is parallel to the extending direction of the first straight section 121, each second straight portion 23 is parallel to the extending direction of the second straight section 131, and the arc portion 22 is an arc surface protruding outwards away from the main flue.
Specifically, as shown in fig. 4, the arc-shaped portion 22 is provided between the first straight line portion 21 and the second straight line portion 23, and the upper end of the arc-shaped portion 22 is tangent to the first straight line portion 21, the lower end of the arc-shaped portion 22 is tangent to the second straight line portion 23, the plurality of first straight line portions 21 are arranged parallel to each other, the extending direction of each first straight line portion 21 is arranged parallel to the extending direction of the first straight line portion 121, the plurality of second straight line portions 23 are arranged parallel to each other, and the extending direction of each second straight line portion 131 is arranged parallel to the extending direction of the second straight line portion 131. The extension sizes of the plurality of arc-shaped sections in the length direction of the pipe body are gradually reduced from left to right, and the curvature radiuses of the plurality of arc-shaped sections are gradually reduced from left to right.
According to the flue assembly provided by the embodiment of the invention, the first straight section 121, the arc-shaped section and the second straight section 131 are arranged, so that the flow velocity and the flow of the flue gas in each flue gas branch are uniformly distributed, the flow velocity and the flow error between the flue gas branches are reduced, the opposite flushing of the air flow is eliminated, and the flue vibration caused by the uneven and asymmetric flow of the flue gas is avoided.
In some embodiments, the second arc-shaped section 132 is relatively disposed with a first side and a second side in the length direction of the pipe body 1, the first straight line portion 21 is relatively disposed with a first end and a second end in the length direction of the pipe body 1, the first end of the first straight line portion 21 is flush with the first side 1323 of the second arc-shaped section, the plurality of first straight line portions 21 are uniformly spaced in the thickness direction of the pipe body 1, the second straight line portion 23 is relatively disposed with the first end and the second end in the length direction of the pipe body 1, the second end of the second straight line portion 23 is flush with the second side 1324 of the second arc-shaped section, and the plurality of second straight line portions 23 are uniformly spaced in the thickness direction of the pipe body 1.
Specifically, as shown in fig. 4, the upper end of the second arc-shaped section 132 is flush with the upper end of the first straight line portion 21, and the upper end of each first straight line portion 21 is flush, the lower end of the second arc-shaped section 132 is flush with the lower end of the second straight line portion 23, and the lower end of each second straight line portion 23 is flush. The plurality of first straight portions 21 are uniformly spaced in the left-right direction, that is, the first straight portions 21 divide the upper end of the second arc-shaped section 132 equally, for example, the number of the first straight portions 21 is four, then the four first straight portions 21 divide the upper end of the second arc-shaped section 132 equally into five sections, it is understood that when there are N first straight portions 21, the N first straight portions 21 divide the upper end of the second arc-shaped section 132 equally into n+1 sections, and the lengths of each section are the same.
The plurality of second straight portions 23 are uniformly spaced apart in the left-right direction, that is, the second straight portions 23 divide the lower end of the second arc-shaped section 132 equally, for example, the number of the second straight portions 131 is four, and then the four second straight portions 23 divide the lower end of the second arc-shaped section 132 equally into five sections, it is understood that when there are N second straight portions 23, the N second straight portions 23 divide the lower end of the second arc-shaped section 132 equally into n+1 sections, and the lengths of each section are the same.
It should be noted that, the dimension of the upper end of the second arc-shaped portion 22 in the left-right direction is L 1, the dimension of the lower end of the small second arc-shaped portion 132 in the left-right direction is L 2, and L 1＜L2, that is, the flow area of the flue gas branch is gradually increased in the length direction of the tube body, and the flow area of the flue gas branch is minimum at the upper end of the first straight portion 21, and the flow area of the flue gas branch is maximum at the lower end of the second straight portion 23.
According to the flue assembly provided by the embodiment of the invention, the plurality of first straight line parts 21 are uniformly arranged at intervals in the left-right direction, and the plurality of second straight line parts 23 are uniformly arranged at intervals in the left-right direction, so that the flow velocity and the flow rate of flue gas in each flue gas branch are uniformly distributed, the flow velocity and the flow rate errors between the flue gas branches are further reduced, the opposite flushing of air flow is eliminated, and the flue vibration caused by uneven and asymmetric flue gas flow is avoided. And the dimension of the upper end of the second arc-shaped section 132 in the left-right direction is smaller than the dimension of the lower end of the second arc-shaped section 132 in the left-right direction, so that the interval distance between two adjacent first straight line parts 21 is smaller than the interval distance between two adjacent second straight line parts 23, and when the smoke in the second flue enters the flue branch, the smoke is compressed due to the reduction of the flow area, so that the flow speed and pressure of the smoke are improved, and the smoke is gradually increased due to the flow area of the smoke in the process of circulating in the smoke branch, and the effect of stabilizing the smoke is achieved, so that the smoke flowing out of the third flue is more stable.
In some embodiments, the flue assembly further comprises a first metal compensator 3 and a second metal compensator 4, the first metal compensator 3 being connected between the first pipe section 11 and the second pipe section 12, the second metal compensator 4 being connected between the second pipe section 12 and the third pipe section 13.
The first metal compensator 3 and the second metal compensator 4 are both located outside the main flue. It will be appreciated that the number of metal compensators is related to the number of pipe sections into which the pipe body 1 is divided, for example, the number of metal compensators is two if the pipe body 1 is divided into three sections, and the number of metal compensators is N-1 if the pipe body 1 is divided into N sections.
Specifically, as shown in fig. 1, one end of the first metal compensator 3 is communicated with the first pipe section 11, the other end of the first metal compensator 3 is communicated with one end of the second pipe section 12, one end of the second metal compensator 4 is communicated with the other end of the second pipe section 12, and the other end of the second metal compensator 4 is communicated with one end of the third pipe section 13.
For example, the first metal compensator 3 and the second metal compensator 4 are both metal ripple compensators.
According to the flue assembly provided by the embodiment of the invention, the displacement errors among the first pipe section 11, the second pipe section 12 and the third pipe section 13 can be eliminated by arranging the first metal compensator 3 and the second metal compensator 4, so that the leakage of flue gas is avoided, and the stability and the safety of flue gas conveying are improved.
In some embodiments, the flue assembly further includes a tapered tube section 14, the tapered tube section 14 communicating with the other end of the second straight section 131, the flow area of the tapered tube section 14 gradually decreasing over the length of the tube.
Specifically, as shown in fig. 1, the upper end of the reducer pipe section 14 communicates with the lower end of the second straight section 131, and the flow area of the reducer pipe section 14 gradually decreases from top to bottom, thereby pressurizing the flue gas flowing out of the third flue and increasing the flow rate.
A flue assembly according to one embodiment of the present invention is described below with reference to fig. 1 to 5.
The first preset included angle α 1 is 73 °, the second preset included angle α 2 is 45 °, the first end face 1221r1=3000 mm of the first arc-shaped section, the radius of curvature r2=2500 mm of the second end face 1222 of the first arc-shaped section, the radius of curvature R 3 =4000 mm of the first end face 1321 of the second arc-shaped section, the radius of curvature r4=500 mm of the second end face 1322 of the second arc-shaped section, the dimension of the upper end of the second arc-shaped section 132 in the left-right direction is L 1 =4050 mm, and the dimension of the lower end of the second arc-shaped section 132 in the left-right direction is L 2 =5430 mm. The spacing distance between the adjacent two first straight line portions 21 is 810mm, and the spacing distance between the adjacent two second straight line portions 23 is 1086mm. The radius of curvature of the arc-shaped portions 22 of the plurality of flow guide plates 2 is 3300mm, 2600mm, 1900mm, 1200mm in this order from left to right.
Operation of the flue assembly of some embodiments of the present invention is described below with reference to fig. 1-5.
As shown in fig. 4, the upper end of the first pipe section 11 is communicated with the outlet of the denitration device 5, and the lower end of the reducing pipe section 14 is communicated with the lower end of the air preheater 6. The flue gas discharged by the denitration device 5 enters the air preheater 6 through the first pipe section 11, the second pipe section 12, the third pipe section 13 and the reducer pipe section 14, when the flue gas enters the first pipe section 11, the first flue buffers and slows down the flow rate of the flue gas, so that the flue gas stably enters the second flue, the flow area of the second flue is smaller than that of the first flue, the flue gas is pressurized and the flow rate is increased when passing through the second flue, when the flue gas enters the third flue, the flue gas uniformly enters a plurality of flue gas branches after being shunted by the guide plates 2 due to the existence of the guide plates 2, the flue gas firstly passes through the pressurizing and flow rate increasing in the flue gas branches and then is discharged into the reducer pipe section 14, and finally enters the air preheater 6 after passing through the pressurizing and flow rate increasing of the reducer pipe section 14.
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 (4)
1. A flue assembly, comprising:
The pipe body is internally provided with a main flue for flue gas flow, the pipe body comprises a first pipe section, a second pipe section, a third pipe section and a reducer pipe section which are sequentially communicated in the length direction of the pipe body, the first pipe section, the second pipe section, the third pipe section and the reducer pipe section form the main flue,
The second pipe section comprises a first straight section and a first arc section, one end of the first arc section is communicated with the first pipe section, the other end of the first arc section is communicated with one end of the first straight section,
The third pipe section comprises a second straight section and a second arc section, one end of the second arc section is communicated with the other end of the first straight section, the other end of the second arc section is communicated with one end of the second straight section,
The reducing pipe section is communicated with the other end of the second straight section, and the flow area of the reducing pipe section is gradually reduced in the length direction of the pipe body;
The first pipe section is internally provided with a first flue, the second pipe section is internally provided with a second flue, the third pipe section is internally provided with a third flue, the first flue, the second flue and the third flue are mutually communicated, the first flue, the second flue and the third flue form a main flue, the flow area of the first flue is larger than the flow area of the second flue, the flow area of the second flue is smaller than the flow area of the third flue, and the flow area of the third flue is smaller than the flow area of the first flue.
The first straight section is obliquely arranged from right to left in the up-down direction, and the second straight section is vertically arranged in the up-down direction;
The first pipe section is provided with a first end face and a second end face which are oppositely arranged in the length direction of the pipe body, the first pipe section is provided with a first side face and a second side face which are oppositely arranged in the thickness direction of the pipe body, a first preset included angle is formed between the first end face of the first pipe section and the first side face of the first pipe section, and a second preset included angle is formed between the first end face of the first pipe section and the second side face of the first pipe section;
The first preset included angle is alpha 1, alpha 1 is more than or equal to 70 degrees and less than or equal to 80 degrees, and the second preset included angle is alpha 2, and alpha 2 is more than or equal to 40 degrees and less than or equal to 50 degrees;
The first arc-shaped section is provided with a first end face and a second end face which are oppositely arranged in the thickness direction of the pipe body, the first end face of the first arc-shaped section is an inward concave arc face facing the main flue, the curvature radius of the first end face of the first arc-shaped section is R 1, R 1 is less than or equal to 1500mm and less than or equal to 6000mm, the second end face of the first arc-shaped section is an outward convex arc face far away from the main flue, and the curvature radius of the second end face of the first arc-shaped section is R 2, and R 2 is more than or equal to 1000mm and less than or equal to 5000mm;
The plurality of guide plates are arranged in the second arc-shaped section, are arranged at intervals in the thickness direction of the pipe body and divide the flue in the second arc-shaped section into a plurality of flue branches;
the plurality of guide plates comprise a first linear part, an arc-shaped part and a second linear part which are sequentially connected in the length direction of the pipe body, the extending direction of each first linear part is parallel to the extending direction of the first straight section, each second linear part is parallel to the extending direction of the second straight section, and the arc-shaped part is an outwards convex arc-shaped surface far away from the main flue;
The dimension of the upper end of the second arc-shaped section in the thickness direction of the pipe body is smaller than that of the lower end of the second arc-shaped section in the thickness direction of the pipe body, so that the interval distance between two adjacent first straight line parts is smaller than that between two adjacent second straight line parts;
The second arc section is in first terminal surface and second terminal surface have relatively arranged in the thickness direction of body, the first terminal surface of second arc section is kept away from the arcwall face of main flue's evagination, just the radius of curvature of the first terminal surface of second arc section is R 3, and 2000mm is less than or equal to R 3 is less than or equal to 6000mm, the second terminal surface of second arc section is the orientation the arcwall face of main flue's indent, the radius of curvature of the second terminal surface of second arc section is R 4, and 500mm is less than or equal to R 4 is less than or equal to 1500mm.
2. The flue assembly of claim 1 wherein the second arcuate segment has first and second sides disposed opposite each other in a length direction of the duct body, the first linear portion has first and second ends disposed opposite each other in the length direction of the duct body, the first ends of the first linear portions are aligned with the first sides of the second arcuate segment, the plurality of first linear portions are uniformly spaced apart in a thickness direction of the duct body, the second linear portion has first and second ends disposed opposite each other in the length direction of the duct body, the second ends of the second linear portions are aligned with the second sides of the second arcuate segment, and the plurality of second linear portions are uniformly spaced apart in the thickness direction of the duct body.
3. The flue assembly of claim 1 or 2 further comprising a first metal compensator connected between the first tube segment and the second tube segment.
4. The flue assembly of claim 1 further comprising a second metal compensator connected between the second tube segment and a third tube segment.
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