CN216079861U

CN216079861U - Flue assembly

Info

Publication number: CN216079861U
Application number: CN202122167957.3U
Authority: CN
Inventors: 刘勇先; 王正发; 周洪; 肖卫东
Original assignee: Guizhou Xishui Dingtai Energy Development Co Ltd
Current assignee: Guizhou Xishui Dingtai Energy Development Co Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2022-03-18
Anticipated expiration: 2031-09-08

Abstract

The utility model discloses a flue assembly which comprises a pipe body, wherein a main flue for flue gas flowing 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-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, and the other end of the second arc-shaped section is communicated with one end of the second straight section. The flue assembly provided by the utility model can reduce the resistance of the main flue and reduce equipment vibration and noise caused by unstable airflow.

Description

Flue assembly

Technical Field

The utility model relates to the technical field of induced draft fans, in particular to a flue assembly.

Background

With the continuous improvement of environmental protection standards, most power plants are transformed with ultralow emission. When a plurality of power plants are newly added with equipment, the connection of the main flue is disordered and complex due to the limitation of site space, so that the flue gas flow field in the main flue is unbalanced, the problems of airflow hedging, airflow pulsation and the like are caused, and finally the vibration of the main flue and the equipment is caused.

SUMMERY OF THE UTILITY MODEL

The present invention is based on the discovery and recognition by the inventors of 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 communicating 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 communicating main flue and separates the flue gas entering the communicating main flue from the second main flue from the third main flue. The flue assembly in the related art can reduce disturbance of the air flow in the main flue. However, the inventor of the present application has found that, in the flue gas assembly in the related art, airflow is dispersed through the three main flues, however, the three main flues are respectively converged to the main flues, airflow in the main flues is easily unstable due to different flue gas flow rates and flow rates in the three main flues, and if the effect of stabilizing the flow rate in the main flues is achieved by distributing the flow rates in the three main flues, an airflow distribution component needs to be added, which increases the equipment investment cost.

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the utility model provides a flue gas assembly, which can reduce the resistance of a main flue and reduce the vibration and noise of equipment caused by unstable airflow.

The flue assembly comprises a pipe body, wherein a main flue for flue gas to 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 main flue is formed by the first pipe section, the second pipe section and the third pipe section, the second pipe section comprises a first flat 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 flat section, the third pipe section comprises a second flat section and a second arc section, one end of the second arc section is communicated with the other end of the first flat section, and the other end of the second arc section is communicated with one end of the second flat section.

According to the flue assembly provided by the embodiment of the utility model, the resistance of the main flue can be reduced, and the vibration and noise of equipment caused by unstable airflow can be reduced.

In some embodiments, the first pipe section is provided with a first end face and a second end face in a length direction of the pipe body, the first pipe section is provided with a first side face and a second side face in a 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 α₁And alpha is not more than 70 degrees₁Not more than 80 degrees, and the second preset included angle is alpha₂And alpha is not more than 40 degrees₂≤50°。

In some embodiments, the first arc-shaped section is provided with a first end surface and a second end surface which are oppositely arranged in the thickness direction of the pipe body, the first end surface of the first arc-shaped section is an inward concave arc-shaped surface facing the main flue, and the radius of curvature of the first end surface of the first arc-shaped section is R₁And R is more than or equal to 1500mm₁6000mm or less, the second end face of the second arc-shaped section is an arc-shaped face which is far away from the outer protrusion of the main flue, and the curvature radius of the second end face of the second arc-shaped section is R₂And R is not less than 1000mm₂≤5000mm。

In some embodiments, the second arcuate segment is at theA first end surface and a second end surface are oppositely arranged in the thickness direction of the pipe body, the first end surface of the second arc-shaped section is an arc-shaped surface which is far away from the outer protrusion of the main flue, and the curvature radius of the first end surface of the second arc-shaped section is R₃And R is more than or equal to 2000mm₃6000mm or less, the second end face of the second arc-shaped section is an arc-shaped face facing the inner recess of the main flue, and the curvature radius of the second end face of the second arc-shaped section is R₄And R is not less than 500mm₄≤1500mm。

In some embodiments, the flue assembly further includes a plurality of guide plates, the plurality of guide plates are respectively disposed in the pipe body, the plurality of guide plates are located in the second arc-shaped section, the plurality of guide plates are arranged at intervals in the thickness direction of the pipe body, and the plurality of guide plates divide the flue in the second arc-shaped section into a plurality of flue branches.

In some embodiments, each of the plurality of flow deflectors includes a first straight line portion, an arc portion and a second straight line portion connected in sequence in the length direction of the pipe body, the extending direction of each of the first straight line portions is parallel to the extending direction of the first straight section, each of the second straight line portions is parallel to the extending direction of the second straight section, and the arc portion is an arc-shaped surface protruding outwards away from the main flue.

In some embodiments, the second arc-shaped segment is disposed with a first side and a second side opposite to each other in the length direction of the pipe body, the first straight portions are disposed with a first end and a second end opposite to each other in the length direction of the pipe body, the first ends of the first straight portions are flush with the first side of the second arc-shaped segment, the first straight portions are uniformly spaced apart in the thickness direction of the pipe body, the second straight portions are disposed with a first end and a second end opposite to each other in the length direction of the pipe body, the second ends of the second straight portions are flush with the second side of the second arc-shaped segment, and the second straight portions are uniformly spaced apart in the thickness direction of the pipe body.

In some embodiments, the flue assembly further comprises a first metal compensator connected between the first pipe segment and the second pipe segment.

In some embodiments, the flue assembly further comprises a second metal compensator connected between the second tube segment and a third tube segment.

Drawings

FIG. 1 is a schematic structural view of a flue assembly of 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 illustration of the configuration of a first tube segment in a flue assembly according to an embodiment of the present invention.

FIG. 4 is a schematic view of a second arcuate segment in a flue assembly in accordance with an embodiment of the present invention in cooperation with a baffle.

FIG. 5 is a schematic view of a flue assembly in connection with a denitrator and an air preheater according to an embodiment of the present invention.

Reference numerals:

the tubular body 1, the first tubular section 11, the first end surface 111 of the first tubular section, the first side surface 112 of the first tubular section, the second side surface 113 of the first tubular section,

a second tube segment 12, a first straight segment 121, a first arcuate segment 122, a first end face 1221 of the first arcuate segment, a second end face 1222 of the first arcuate segment,

a third pipe segment 13, a second straight segment 131, a second arcuate segment 132, a first end surface 1321 of the second arcuate segment, a second end surface 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 variable diameter pipe section 14 is provided with a variable diameter pipe section,

a baffle plate 2, a first straight line part 21, an arc part 22, a second straight line part 23,

the device comprises 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 with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1 to 4, a flue assembly according to an embodiment of the present invention includes a pipe body 1.

A flue for flowing flue gas is arranged in the pipe body 1, 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 (the up-down direction 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 flue, the second pipe section 12 comprises a first straight section 121 and a first arc-shaped section 122, one end of the first arc-shaped section 122 is communicated with the first pipe section 11, the other end of the first arc-shaped 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-shaped section 132, one end of the second arc-shaped section 132 is communicated with the other end of the first straight section 121, and the other end of the second arc-shaped section 132 is communicated with one end of the second straight section 131.

It should be noted that 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, a first flue is arranged in the first pipe section 11, a second flue is arranged in the second pipe section 12, a third flue is arranged in the third pipe section 13, the first flue, the second flue and the third flue are communicated with each other, 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 arcuate segment 122 is in communication with the lower end of the first pipe segment 11, the lower end of the first arcuate segment 122 is in communication with the upper end of the first straight segment 121, the lower end of the first straight segment 121 is in communication with the upper end of the second arcuate segment 132, and the lower end of the second arcuate segment 132 is in communication with the upper end of the second straight segment 131. The first straight section 121 is inclined from right to left in the up-down direction, and the second straight section 131 is vertically arranged in the up-down direction.

According to the flue assembly provided by the embodiment of the utility model, 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 a main flue can be reduced, and the vibration and noise of equipment caused by unstable airflow can be reduced. The flow area of first flue is greater than the flow area of second flue, make first flue can short-term storage flue gas slow down the pressure and the velocity of flow that the flue gas got into the flue, avoid the flue to cause the flue to block up in gushing into the flue in a large number, the flow area of second flue is minimum, can compress the flue gas in the first flue, improve the velocity of flow and the pressure that the flue gas got into the third flue, the third flue is suitable for and communicates with external equipment, thereby guarantee that the flue gas gets into external equipment's pressure and velocity of flow.

In some embodiments, the first pipe segment 11 is oppositely disposed with a first end surface (an upper end surface of the first pipe segment 11 as shown in fig. 2) and a second end surface in a length direction of the pipe body 1, the first pipe segment 11 is oppositely disposed with a first side (a left side surface of the first pipe segment 11 as shown in fig. 2) and a second side surface (a right side surface of the first pipe segment 11 as shown in fig. 2) in a thickness direction of the pipe body 1, the first end surface 111 of the first pipe segment and the first side surface 112 of the first pipe segment have a first preset included angle therebetween, and the first end surface 111 of the first pipe segment and the second side surface 113 of the first pipe segment have a second preset included angle therebetween.

Specifically, as shown in fig. 2, a first preset included angle is formed between the upper end surface of the first pipe segment 11 and the left side surface of the first pipe segment 11, and a second preset included angle is formed between the upper end surface of the first pipe segment 11 and the right side surface of the first pipe segment 11. The dimension of the left side surface of the first pipe segment 11 in the up-down direction is smaller than the dimension of the right side surface of the first pipe segment 11 in the up-down direction.

According to the flue assembly provided by the embodiment of the utility model, an 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, an 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, and the size of the left side surface of the first pipe section 11 in the vertical direction is smaller than that of the right side surface of the first pipe section 11 in the vertical direction, so that gas vortex generated by flue gas in the first pipe section 11 is avoided, and the resistance of the flue to the flue gas is reduced.

In some embodiments, the first predetermined included angle is α₁And alpha is not more than 70 degrees₁Not more than 80 degrees, and a second preset included angle of not more than 40 degrees₂≤50°。

Specifically, the first preset included angle α₁May be 70 °, 72 °, 75 °, 76 °, 78 °, 79 ° or 80 °. Second preset included angle alpha₂May be 40 °, 42 °, 45 °, 46 °, 48 °, 49 ° or 50 °. It can be understood that the sizes of the first preset included angle and the second preset included angle can be adjusted according to the type of the smoke.

In the flue assembly of the embodiment of the utility model, when the first preset included angle is more than or equal to alpha and is more than or equal to 70 degrees₁Not more than 80 degrees, and a second preset included angle of not more than 40 degrees₂Less than or equal to 50, avoid the flue to cause the interference to the flow of flue gas, reduce the resistance of flue to the flue gas flow promptly, can also make the flue gas in the first flue more steady get into the second flue simultaneously in, avoid flue vibration and equipment vibration that the flue gas flow unstability leads to.

In some embodiments, the first arc-shaped segment 122 has a first end face and a second end face arranged oppositely in the thickness direction of the pipe body 1, the first end face 1221 of the first arc-shaped segment is a concave arc-shaped face facing the main flue, and the first end face 1221 of the first arc-shaped segment has a radius of curvature R₁And R is more than or equal to 1500mm₁Less than or equal to 6000mm, the second end surface 1322 of the second arc-shaped section is an outward convex arc-shaped surface far away from the main flue, and the curvature radius of the second end surface 1322 of the second arc-shaped section is R₂And R is not less than 1000mm₂≤5000mm。

Specifically, as shown in fig. 1, the left end face of the first arc-shaped section 122 is an arc-shaped face that is concave towards the inside direction of the main flue, and the left end face of the first arc-shaped section 122 is inboard and level with the left end face of the first pipe section 11, and the right end face of the first arc-shaped section 122 is an arc-shaped face that is convex towards the outside direction of the main flue, and the right end face of the first arc-shaped section 122 is inboard and level with the right end face of the first pipe section 11, so that the resistance of the flue gas when flowing to the second flue from the first flue is reduced.

For example, the radius of curvature R of the left end face of the first arcuate segment 122₁Can be 1500mm, 1550mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm, 5500mm, 6000 mm. Radius of curvature R of the right end face of the first arcuate segment 122₂Can be 1000mm, 1500mm, 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000 mm.

In the flue assembly of the embodiment of the utility model, when the left end surface of the first arc-shaped section 122 is an arc-shaped surface, and the curvature radius of the left end surface of the first arc-shaped section 122 is more than or equal to R and is more than or equal to 1500mm₁Not more than 6000mm, the left end face of the second arc-shaped section 132 is an arc-shaped face, and the curvature radius of the right end face of the first arc-shaped section 122 is not less than 1000mm and not more than R₂When being less than or equal to 5000mm, when can avoiding making the flue gas in the first flue get into the second flue, produce gaseous vortex in the junction of first flue and second flue to reduce the resistance of flue to the flue, make the flue gas more steady that flows in the main flue, reduced flue vibration and noise.

In some embodiments, the second arc-shaped segment 132 has a first end surface and a second end surface arranged oppositely in the thickness direction of the pipe body 1, the first end surface 1321 of the second arc-shaped segment is an arc-shaped surface which is convex outwards and away from the main flue, and the radius of curvature 1321 of the second arc-shaped segment is R₃And R is more than or equal to 2000mm₃Less than or equal to 6000mm, the second end face 1322 of the second arc-shaped section is an inward concave arc-shaped face facing the main flue, and the curvature radius of the second end face 1322 of the second arc-shaped section is R₄And R is not less than 500mm₄≤1500mm。

Specifically, as shown in fig. 1, the left end face of the second arc-shaped section 132 is an arc-shaped face that is concave outward toward the outside 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, and the right end face of the second arc-shaped section 132 is an arc-shaped face that is concave inward toward the inside 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 as to reduce the resistance of the flue gas when the flue gas flows from the second flue to the third flue.

Examples of such applications areIllustratively, the radius of curvature R of the left end face of the second arcuate segment 132₃Can be 2000mm, 2500mm, 3000mm, 3500mm, 4000mm, 4500mm, 5000mm, 5500mm, 6000 mm. Radius of curvature R of the right end face of the second arcuate segment 132₄May be 500mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 1000mm, 1200mm, 1500 mm.

In the flue assembly of the embodiment of the utility model, when the left end surface of the second arc-shaped section 132 is an arc-shaped surface, and the curvature radius of the left end surface of the second arc-shaped section 132 is more than or equal to R and is more than or equal to 2000mm₃Is not more than 6000mm, the left end surface of the second arc-shaped section 132 is an arc-shaped surface, and the curvature radius of the right end surface of the second arc-shaped section 132 is not less than 500mm and not more than R₄When being less than or equal to 1500mm, when flue gas in the second flue can be prevented from entering the third flue, gas vortex is generated at the joint of the second flue and the third flue, so that the resistance of the flue to the flue gas is reduced, the flue gas flows more stably in the main flue, and the vibration and the noise of the flue are reduced.

In some embodiments, the flue assembly further includes a plurality of guide plates 2, the plurality of guide plates 2 are respectively disposed in the pipe body 1, the plurality of guide plates 2 are located in the second arc-shaped section 132, the plurality of guide plates 2 are spaced in a thickness direction (a left-right direction as shown in fig. 3) of the pipe body 1, and the plurality of guide plates 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 end and the rear end of each of the plurality of guide plates 2 are connected to the inner wall surface of the pipe body 1, the plurality of guide plates 2 are arranged at intervals in the left-right direction, and the plurality of guide plates 2 divide the third flue into a plurality of independent flue branches, where it should be noted that when the number of the guide plates 2 is N, the third flue is divided into N +1 flue branches. The size of the plurality of guide plates 2 in the vertical direction gradually increases from right to left.

According to the flue assembly provided by the embodiment of the utility model, the plurality of guide plates 2 are arranged, so that the flue gas in the third flue can be divided, the distribution of the flue gas flowing out of the third flue can be more uniform, the distribution of the flue gas flow field in the third pipe section 13 can be uniform, and abnormal sound and low-frequency vibration of the flue caused by non-uniform air flow in the flowing process can be reduced.

In some embodiments, the plurality of baffles 2 each include a first straight portion 21, an arc portion 22 and a second straight portion 23 connected in sequence in the length direction of the pipe 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 which is convex outward away from the flue.

Specifically, as shown in fig. 4, the arc portion 22 is provided between the first straight portion 21 and the second straight portion 23, and an upper end of the arc portion 22 is tangent to the first straight portion 21, a lower end of the arc portion 22 is tangent to the second straight portion 23, the plurality of first straight portions 21 are arranged in parallel to each other, and an extending direction of each first straight portion 21 is arranged in parallel to an extending direction of the first straight section 121, the plurality of second straight portions 23 are arranged in parallel to each other, and an extending direction of each second straight section 131 is arranged in parallel to an extending direction of the second straight section 131. The extension size of the arc-shaped sections in the length direction of the pipe body is gradually reduced from left to right, and the curvature radius of the arc-shaped sections is gradually reduced from left to right.

According to the flue assembly provided by the embodiment of the utility model, by arranging the first straight section 121, the arc-shaped section and the second straight section 131, the flow velocity and flow distribution of flue gas in each flue gas branch are uniform, the flow velocity and flow error among the flue gas branches are reduced, the opposite impact of air flow is eliminated, and flue vibration caused by non-uniform and asymmetric flue gas flow is avoided.

In some embodiments, the second arc-shaped segment 132 has a first side and a second side opposite to each other in the length direction of the pipe body 1, the first linear portions 21 have a first end and a second end opposite to each other in the length direction of the pipe body 1, the first ends of the first linear portions 21 are flush with the first side 1323 of the second arc-shaped segment, the plurality of first linear portions 21 are uniformly spaced in the thickness direction of the pipe body 1, the second linear portions 23 have a first end and a second end opposite to each other in the length direction of the pipe body 1, the second ends of the second linear portions 23 are flush with the second side 1324 of the second arc-shaped segment, and the plurality of second linear 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 segment 132 is flush with the upper end of the first linear portion 21, and the upper end of each first linear portion 21 is flush, and the lower end of the second arc-shaped segment 132 is flush with the lower end of the second linear portion 23, and the lower end of each second linear portion 23 is flush. The plurality of first straight portions 21 are arranged at regular intervals in the left-right direction, that is, the first straight portions 21 equally divide the upper end of the second arc-shaped section 132, for example, the number of the first straight portions 21 is four, and the four first straight portions 21 equally divide the upper end of the second arc-shaped section 132 into five segments, it can be understood that when there are N first straight portions 21, the N first straight portions 21 equally divide the upper end of the second arc-shaped section 132 into N +1 segments, and the lengths of the segments are the same.

The plurality of second straight portions 23 are arranged at regular intervals in the left-right direction, that is, the second straight portions 23 equally divide the lower end of the second arc-shaped section 132, for example, the number of the second flat sections 131 is four, and the four second straight portions 23 equally divide the lower end of the second arc-shaped section 132 into five sections, it can be understood that when there are N second straight portions 23, the N second straight portions 23 equally divide the lower end of the second arc-shaped section 132 into N +1 sections, and the lengths of the sections are the same.

Note that the dimension of the upper end of the second arc-shaped portion 22 in the left-right direction is L₁The dimension of the lower end of the small second arc-shaped section 132 in the left-right direction is L₂And L is₁＜L₂That is, the flow area of the flue gas branch gradually increases in the length direction of the pipe body, and the flow area of the flue gas branch is the smallest at the upper end of the first straight portion 21, and the flow area of the flue gas branch is the largest at the lower end of the second straight portion 23.

According to the flue assembly provided by the embodiment of the utility model, the plurality of first straight parts 21 are uniformly arranged at intervals on the left and right sides, and the plurality of second straight parts 23 are uniformly arranged at intervals on the left and right sides, so that the flow velocity and flow distribution of flue gas in each flue gas branch are uniform, the flow velocity and flow error among the flue gas branches are further reduced, the opposite impact of air flow is eliminated, and the flue vibration caused by non-uniform and asymmetric flow of flue gas is avoided. And the size of the upper end of the second arc-shaped section 132 in the left-right direction is smaller than the size of the lower end of the second arc-shaped section 132 in the left-right direction, so that the spacing distance between two adjacent first straight line parts 21 is smaller than the spacing distance between two adjacent second straight line parts 23, when 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 the pressure of the smoke are improved, and in the process of circulation of the smoke in the flue branch, the flow area recorded by the smoke is gradually increased, 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.

Note that the first metal compensator 3 and the second metal compensator 4 are both located outside the main flue. It will be understood that the number of metal compensators is related to the number of segments into which the tubular body 1 is divided, for example, two for three segments of the tubular body 1 and N-1 for N segments of the tubular body 1.

Specifically, as shown in fig. 1, one end of the first metal compensator 3 communicates with one end of a first pipe segment 11, the other end of the first metal compensator 3 communicates with one end of a second pipe segment 12, one end of the second metal compensator 4 communicates with the other end of the second pipe segment 12, and the other end of the second metal compensator 4 communicates with one end of a third pipe segment 13.

For example, the first metal compensator 3 and the second metal compensator 4 are both metal corrugated compensators.

According to the flue assembly provided by the embodiment of the utility model, through arranging the first metal compensator 3 and the second metal compensator 4, displacement errors among the first pipe section 11, the second pipe section 12 and the third pipe section 13 can be eliminated, 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 comprises a reducing pipe section 14, the reducing pipe section 14 is communicated with the other end of the second straight section 131, and the flow area of the reducing pipe section 14 is gradually reduced in the length direction of the pipe body.

Specifically, as shown in fig. 1, the upper end of the reducing pipe section 14 is communicated with the lower end of the second straight section 131, and the flow area of the reducing pipe section 14 is gradually reduced from top to bottom, so as to pressurize the flue gas flowing out of the third flue and increase the flow rate.

A flue assembly of one embodiment of the present invention is described below with reference to fig. 1 to 5.

First preset included angle alpha₁Is 73 DEG, and a second preset included angle alpha₂At 45 °, the first end face 1221R1 of the first arc segment is 3000mm, the radius of curvature R2 of the second end face 1222 of the first arc segment is 2500mm, and the radius of curvature R of the first end face 1321 of the second arc segment is 2500mm₃4000mm, the radius of curvature R4 of the second end surface 1322 of the second arc segment is 500mm, and the upper end of the second arc segment 132 has a dimension L in the left-right direction₁4050mm, the dimension L of the lower end of the second arc segment 132 in the left-right direction₂5430 mm. The distance between two adjacent first straight portions 21 is 810mm, and the distance between two adjacent second straight portions 23 is 1086 mm. The curvature radius of the arc-shaped part 22 of the guide plates 2 is 3300mm, 2600mm, 1900mm and 1200mm from left to right.

The 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 segment 11 is communicated with the outlet of the denitration device 5, and the lower end of the variable diameter pipe segment 14 is communicated with the lower end of the air preheater 6. The flue gas that denitration device 5 was discharged passes through first pipe section 11, second pipe section 12, third pipe section 13 and reducing pipe section 14 get into air heater 6, when the flue gas got into first pipe section 11, first flue carries out the buffer memory to the flue gas and slows down the velocity of flow, make the steady entering second flue of flue gas in, because the flow area of second flue is less than the flow area of first flue, make the flue gas obtain the pressure boost and improve the velocity of flow when passing through the second flue, when the flue gas gets into the third flue, because the existence of a plurality of guide plates 2, the flue gas is by even a plurality of flue gas branch roads of entering behind the guide plate 2 reposition of redundant personnel, the flue gas is discharged reducing pipe section 14 after the pressure boost of earlier in the flue gas branch road and the improvement velocity of flow, the flue gas is last to pass through reducing pipe section 14 and improve the velocity of flow and then get into air heater 6.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A flue assembly, comprising:

the flue gas purification device comprises a pipe body, wherein a main flue for flue gas to 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-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, and the other end of the second arc-shaped section is communicated with one end of the second straight section.

2. The flue assembly of claim 1, wherein the first pipe section is provided with a first end surface and a second end surface opposite to each other in the length direction of the pipe body, the first pipe section is provided with a first side surface and a second side surface opposite to each other in the thickness direction of the pipe body, a first preset included angle is formed between the first end surface of the first pipe section and the first side surface of the first pipe section, and a second preset included angle is formed between the first end surface of the first pipe section and the second side surface of the first pipe section.

3. The flue assembly of claim 2 wherein the first predetermined included angle is α₁And alpha is not more than 70 degrees₁Not more than 80 degrees, and the second preset included angle is alpha₂And alpha is not more than 40 degrees₂≤50°。

4. The flue assembly according to claim 2, wherein the first arc-shaped section is provided with a first end surface and a second end surface which are opposite to each other in the thickness direction of the pipe body, the first end surface of the first arc-shaped section is an arc surface which is concave towards the main flue, and the radius of curvature of the first end surface of the first arc-shaped section is R₁And R is more than or equal to 1500mm₁6000mm or less, the second end face of the second arc-shaped section is an arc-shaped face which is far away from the outer protrusion of the main flue, and the curvature radius of the second end face of the second arc-shaped section is R₂And R is not less than 1000mm₂≤5000mm。

5. The flue assembly of claim 2, wherein the second arcuate segment has a first end disposed opposite to a first end disposed in a thickness direction of the pipe bodyThe first end surface of the second arc-shaped section is an outward convex arc-shaped surface far away from the main flue, and the curvature radius of the first end surface of the second arc-shaped section is R₃And R is more than or equal to 2000mm₃6000mm or less, the second end face of the second arc-shaped section is an arc-shaped face facing the inner recess of the main flue, and the curvature radius of the second end face of the second arc-shaped section is R₄And R is not less than 500mm₄≤1500mm。

6. The flue assembly of claim 1, further comprising a plurality of baffles disposed within the second arcuate segment, the plurality of baffles being spaced apart in a thickness direction of the tubular body, the plurality of baffles dividing the flue within the second arcuate segment into a plurality of flue legs.

7. The flue assembly of claim 6, wherein the plurality of baffles each comprise a first linear portion, an arcuate portion and a second linear portion connected in series along the length of the tubular body, each first linear portion extending parallel to the first straight section, each second linear portion extending parallel to the second straight section, the arcuate portion being a convex arcuate surface away from the main flue.

8. The flue assembly of claim 7, wherein the second arcuate section has a first side and a second side opposite each other in a length direction of the pipe body, the first straight portions have a first end and a second end opposite each other in the length direction of the pipe body, the first ends of the first straight portions are flush with the first side of the second arcuate section, the first straight portions are evenly spaced in a thickness direction of the pipe body, the second straight portions have a first end and a second end opposite each other in the length direction of the pipe body, the second ends of the second straight portions are flush with the second side of the second arcuate section, and the second straight portions are evenly spaced in the thickness direction of the pipe body.

9. The flue assembly of any of claims 1-8, further comprising a first metal compensator connected between the first pipe segment and the second pipe segment.

10. The flue assembly of any of claims 1-8, wherein the tubular body further comprises a second metal compensator connected between the second tube segment and a third tube segment.