CN213237587U

CN213237587U - Flue duct

Info

Publication number: CN213237587U
Application number: CN202022252375.0U
Authority: CN
Inventors: 袁振峰; 包满都呼; 张海军; 王学强
Original assignee: Inner Mongolia Yitai Chemical Co ltd
Current assignee: Inner Mongolia Yitai Chemical Co ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2021-05-18
Anticipated expiration: 2030-10-10

Abstract

The utility model discloses a flue, an air preheater is arranged in the flue, and a tube bundle of the air preheater is parallel to the flowing direction of primary air and secondary air and is vertical to the flowing direction of flue gas; the inner wall of the flue at the inlet side of the primary air and the secondary air is provided with a first baffle plate, and the first baffle plate is positioned above the tube bundle and covers the inlet section of the primary air and the secondary air. The existence of the first baffle plate can change the flow direction of the flue gas so as to prevent the flue gas from passing through an area easy to deposit dust, thereby reducing the formation of the dust; meanwhile, vortex generated by flowing of the flue gas can play a role in cleaning the existing accumulated dust below the first baffle. Therefore, the utility model provides a flue has improved the flue, can avoid the emergence of air heater deposition phenomenon, has solved the difficult problem in this field at present stage.

Description

Flue duct

Technical Field

The utility model relates to an air heater tube bank deposition technical field, more specifically says, relates to a flue.

Background

The method is characterized in that ash deposition happens occasionally on tube bundles of an air preheater of the circulating fluidized bed boiler, and due to the influence of the arrangement form of the air preheater, the ash deposition phenomenon is easy to happen between the tube bundles at the inlet sections of a primary air preheater and a secondary air preheater; particularly, when the air temperature is lower in winter, the smoke at the inlet sections of the primary air and the secondary air is lower than the dew point temperature, so that serious dust accumulation is easily caused; moreover, the low temperature regions on both sides of the air preheater near the tail flue also cause severe dust accumulation. Please refer to fig. 4-6. The dust deposition of the air preheater not only influences the normal operation of the boiler, but also increases the overhauling difficulty and the overhauling cost of workers.

Therefore, how to improve the flue to avoid the occurrence of the ash accumulation phenomenon of the air preheater is a difficult problem to be solved urgently in the field at the present stage.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a flue has improved the flue, can avoid the emergence of air heater deposition phenomenon, has solved the difficult problem in this field at present stage.

A flue is internally provided with an air preheater, and a tube bundle of the air preheater is parallel to the flowing direction of primary air and secondary air and is vertical to the flowing direction of flue gas;

the inner walls of the flue at the inlet sides of the primary air and the secondary air are provided with first baffles, and the first baffles are positioned above the tube bundles and cover the inlet sections of the primary air and the secondary air.

Preferably, the first baffle is inclined from the inner wall of the flue to the direction close to the tube bundle.

Preferably, in the flue, the included angle between the first baffle and the tube bundle is 45 °.

Preferably, the flue is equipped with the second baffle at the inner wall of tube bank both sides.

Preferably, in the flue, the two second baffles are both located above the tube bundle and cover between the tube bundle and the inner wall of the flue.

Preferably, the second baffle is perpendicular to the inner wall of the flue.

Preferably, in the flue, the first baffle is a steel plate with the thickness ranging from 2mm to 4 mm.

Preferably, in the flue, the second baffle is a steel plate with the thickness ranging from 2mm to 4 mm.

Preferably, the first baffle plate and the inner wall of the flue are welded.

Preferably, the second baffle is welded with the inner wall of the flue.

The utility model provides a flue, an air preheater is arranged in the flue, and a pipe bundle of the air preheater is parallel to the flowing direction of primary air and secondary air and is vertical to the flowing direction of flue gas; the inner wall of the flue at the inlet side of the primary air and the secondary air is provided with a first baffle plate, and the first baffle plate is positioned above the tube bundle and covers the inlet section of the primary air and the secondary air. The existence of the first baffle plate can change the flow direction of the flue gas so as to prevent the flue gas from passing through an area easy to deposit dust, thereby reducing the formation of the dust; meanwhile, vortex generated by flowing of the flue gas can play a role in cleaning the existing accumulated dust below the first baffle. Therefore, the utility model provides a flue has improved the flue, can avoid the emergence of air heater deposition phenomenon, has solved the difficult problem in this field at present stage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a flue according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of A-A of FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of B-B of FIG. 1 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the soot deposition in the flue in the background art of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4 in the background of the invention;

fig. 6 is a cross-sectional view of B-B in fig. 5 according to the background art of the present invention.

In fig. 1-6:

a tube bundle-1; a first baffle-2; a second baffle-3.

Detailed Description

The core of the specific embodiment lies in providing the flue, improving the flue, avoiding the occurrence of the dust accumulation phenomenon of the air preheater and solving the problem in the field at the present stage.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

In the flue provided by the embodiment, an air preheater is arranged in the flue, and a tube bundle 1 of the air preheater is parallel to the flowing direction of primary air and secondary air and is vertical to the flowing direction of flue gas; the inner wall of the flue at the inlet side of the primary air and the secondary air is provided with a first baffle 2, and the first baffle 2 is positioned above the tube bundle 1 and covers the inlet section of the primary air and the secondary air.

The existence of the first baffle 2 can change the flow direction of the flue gas so as to prevent the flue gas from passing through an area easy to deposit dust, thereby reducing the formation of the dust; meanwhile, vortex generated by flowing of the flue gas can play a role in cleaning the existing accumulated dust below the first baffle 2. Therefore, the utility model provides a flue has improved the flue, can avoid the emergence of air heater deposition phenomenon, has solved the difficult problem in this field at present stage. Please refer to fig. 1-6.

In the flue provided by the present embodiment, the first baffle 2 may be disposed in an inclined shape, for example, the first baffle 2 is inclined from the inner wall of the flue to the direction close to the tube bundle 1; the inclined arrangement mode of the first baffle 2 can further change the flow direction of the flue gas, and simultaneously reduce the resistance of the flow of the flue gas, thereby avoiding the formation of dust deposition.

In the flue provided by the embodiment, the included angle between the first baffle 2 and the tube bundle 1 can be 45 degrees, or other angles capable of playing the same role. See fig. 1-3 for details.

In the flue provided by the embodiment, the inner walls of the flue at the two sides of the tube bundle 1 can be provided with second baffles 3, please refer to fig. 1-3; the two second baffles 3 are both positioned above the tube bundle 1 and cover between the tube bundle 1 and the inner wall of the flue. The setting of second baffle 3 can block the buffering to the mobile formation of flue gas, and then avoids the direct and flue wall contact of flue gas to make the flue gas avoid the low temperature district of afterbody flue, and then play the effect of avoiding the deposition.

In the flue provided by the embodiment, in order to better enable the second baffle 3 to play a role in blocking and buffering the flue gas, the second baffle 3 may be set to be perpendicular to the inner wall of the flue, please refer to fig. 2.

In the flue provided by the embodiment, the first baffle 2 and the second baffle 3 can both adopt thin steel plates, so that the service life of the structure can be prolonged, the use of materials can be reduced, and the burden on the flue is avoided.

For example, the first baffle plate 2 and the second baffle plate 3 may be steel plates having a thickness in the range of 2mm to 4 mm; of course, the thicknesses of the first baffle plate 2 and the second baffle plate 3 can also be selected according to actual needs, so as to achieve better effects.

In the flue provided by the specific embodiment, the first baffle 2 and the inner wall of the flue can be in a welding, clamping or connecting mode capable of playing the same role; in order to facilitate the arrangement of the first baffle 2, a steel plate can be selected and welded to be connected with the inner wall of the flue.

Similarly, the second baffle 3 and the inner wall of the flue can be in a welding, clamping or connecting mode capable of playing the same role; in order to facilitate the arrangement of the second baffle 3, a steel plate can be selected and welded to be connected with the inner wall of the flue.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue is characterized in that an air preheater is arranged in the flue, and a tube bundle (1) of the air preheater is parallel to the flowing direction of primary air and secondary air and is vertical to the flowing direction of flue gas;

the inner wall of the flue at the inlet side of the primary air and the secondary air is provided with a first baffle (2), and the first baffle (2) is positioned above the tube bundle (1) and covers the inlet section of the primary air and the secondary air.

2. A flue according to claim 1 wherein the first baffle (2) is inclined from the inner wall of the flue to a direction close to the tube bundle (1).

3. A flue according to claim 2 wherein the angle between the first baffle (2) and the tube bundle (1) is 45 °.

4. A flue according to claim 1 wherein the inner wall of the flue on both sides of the tube bundle (1) is provided with second baffles (3).

5. A flue according to claim 4 wherein both of the second baffles (3) are located above the tube bundle (1) and overlie the tube bundle (1) and an inner wall of the flue.

6. A flue according to claim 5 wherein the second baffle (3) is perpendicular to the inner wall of the flue.

7. The flue according to claim 1, wherein the first baffle (2) is a steel plate having a thickness in the range of 2mm to 4 mm.

8. The flue according to claim 4, wherein the second shutter (3) is a steel plate having a thickness ranging from 2mm to 4 mm.

9. A flue according to claim 7 wherein the first baffle (2) is welded to the inner wall of the flue.

10. A flue according to claim 8 wherein the second baffle (3) is welded to the inner wall of the flue.