CN216667738U

CN216667738U - Air preheating device

Info

Publication number: CN216667738U
Application number: CN202122760569.6U
Authority: CN
Inventors: 赖银飞
Original assignee: Shanghai Xtek Furnace Co ltd
Current assignee: Shanghai Xtek Furnace Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-06-03
Anticipated expiration: 2031-11-11

Abstract

The utility model provides an air preheating device, which comprises a flue gas flow channel, wherein a first tube plate and a second tube plate are arranged in the flue gas flow channel, a plurality of heat exchange tubes are arranged on the first tube plate and the second tube plate in a penetrating manner, flue gas in the flue gas flow channel enters the heat exchange tubes from heat exchange tube inlets at the first tube plate, is discharged from the heat exchange tubes from heat exchange tube outlets at the second tube plate and enters the flue gas flow channel again; an air inlet and an air outlet are formed in the flue gas flow channel wall surface between the first tube plate and the second tube plate, the air inlet is formed in the flue gas flow channel wall surface close to the second tube plate, the air outlet is formed in the flue gas flow channel wall surface close to the first tube plate, air enters the flue gas flow channel between the first tube plate and the second tube plate from the air inlet and is discharged from the flue gas outlet after exchanging heat with the heat exchange tube. After the technical scheme is adopted, the problem that the occupied area of the air preheater is large can be effectively solved.

Description

Air preheating device

Technical Field

The utility model relates to the technical field of heat exchange equipment, in particular to an air preheating device.

Background

The air preheater of the heating furnace heats air by utilizing flue gas at the outlet of the convection section of the heating furnace, so that the temperature of the air entering the burner can be increased, the consumption of fuel gas is reduced, and the heat efficiency of the heating furnace is improved. The general air preheater adopts a square plate frame structure, a smoke gas channel is formed by rectangular wall plates, steel beam columns are arranged on the rectangular wall plates to play supporting and reinforcing roles, and heat pipes or heat exchange plates are arranged in the wall plates. Usually, the air preheater is independently arranged on the ground, and the structure occupies a large area. In some special application occasions, such as limited occupied area of the device or the need of newly adding an air preheater in device transformation, the arrangement of the independent square air preheater is difficult to realize or causes equipment congestion and insufficient overhaul space.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defects, the utility model aims to provide an air preheating device which can effectively save the floor space.

The utility model discloses an air preheating device, which comprises a flue gas flow channel, wherein a first tube plate and a second tube plate are arranged in the flue gas flow channel, a plurality of heat exchange tubes are arranged on the first tube plate and the second tube plate in a penetrating manner, flue gas in the flue gas flow channel enters the heat exchange tubes from heat exchange tube inlets at the first tube plate, is discharged from heat exchange tube outlets at the second tube plate and enters the flue gas flow channel again;

an air inlet and an air outlet are formed in the flue gas flow channel wall surface between the first tube plate and the second tube plate, the air inlet is formed in the flue gas flow channel wall surface close to the second tube plate, the air outlet is formed in the flue gas flow channel wall surface close to the first tube plate, air enters the flue gas flow channel between the first tube plate and the second tube plate from the air inlet and is discharged from the flue gas outlet after exchanging heat with the heat exchange tube.

Preferably, the flue gas channel wall surface comprises a wall panel and a lining located on the inside of the wall panel;

and a manhole is arranged on the wall surface of the flue gas flow channel between the first tube plate and the second tube plate.

Preferably, a plurality of baffle plates are arranged in a flue gas flow passage between the first tube plate and the second tube plate.

Preferably, a plurality of supporting claws are arranged in a flue gas flow channel between the first tube plate and the second tube plate, and the supporting claws are embedded in the lining and fixedly connected with the wall plate;

each baffle plate is fixedly connected with the plurality of supporting claws through fasteners.

Preferably, the heat exchange tube is welded with the first tube plate;

a flexible tube plate is arranged on one side, away from the first tube plate, of the second tube plate;

the heat exchange tube penetrates through the opening in the second tube plate and is welded with the flexible tube plate.

Preferably, an edge of the flexible tube sheet is welded to the second tube sheet.

Preferably, the heat exchange tube is welded with the first tube plate;

the heat exchange tube is characterized in that a plurality of threaded holes are formed in the second tube plate, two threaded tube clamps are arranged in each threaded hole from top to bottom, a filler is arranged between the threaded tube clamps, each heat exchange tube penetrates through the corresponding threaded tube clamp, a filler is arranged between the corresponding threaded tube clamp, and the corresponding threaded tube clamp and the heat exchange tube are sealed through the filler.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. the technical scheme of this application is through setting up tube sheet, heat exchange tube, air inlet, air outlet isotructure in the flue gas runner, unites two into one air heater and flue gas runner, and the space in the make full use of flue gas runner need not newly-increased take up an area of and sets up the heat exchanger alone, arranges in a flexible way when the land used for facilitating is nervous.

2. The technical scheme of this application, compare in setting up air heater alone, can effectively reduce the material quantity to the cost is lower, can effectively reduce the construction investment.

Drawings

FIG. 1 is a schematic structural diagram of an air preheating device according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is an enlarged view of a portion of FIG. 1 at II;

FIG. 4 is a schematic structural diagram of an air preheating device according to another embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at I;

FIG. 6 is an enlarged view of a portion of FIG. 4 at II;

reference numerals:

1-a flue gas flow channel inlet, 2-a flue gas flow channel outlet, 3-an air inlet, 4-an air outlet, 5-a manhole, 6-a heat exchange tube, 7-a support claw, 8-a baffle plate, 9-a flue gas flow channel wall surface, 10-a first tube plate, 11-a second tube plate, 12-a flexible tube plate, 13-a filler and 14-a threaded tube clamp.

Detailed Description

The advantages of the utility model are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.

Referring to fig. 1 to 3, which are schematic structural diagrams of an air preheating device in an embodiment of the present invention, the air preheating device includes a flue gas channel, that is, a hot flue through which high-temperature flue gas generated by a heating furnace and other devices circulates. A first tube plate 10 and a second tube plate 11 are arranged in the flue gas flow channel, a plurality of heat exchange tubes 6 penetrate through the first tube plate 10 and the second tube plate 11, flue gas in the flue gas flow channel enters the heat exchange tubes 6 from a heat exchange tube inlet of the first tube plate 10, and the heat exchange tubes 6 are discharged from a heat exchange tube outlet of the second tube plate 11 and enter the flue gas flow channel again. That is, through the arrangement of the first tube plate 10, the second tube plate 11 and the heat exchange tubes 6, the flue gas at the flue gas channel inlet 1 at the upper part of the first tube plate 10 flows into the flue gas channel outlet 2 at the lower part of the second tube plate 11 through the heat exchange tubes 6, and the flue gas channel space between the first tube plate 10 and the second tube plate 11 is used for air to flow for heat exchange.

Specifically, an air inlet 3 and an air outlet 4 are provided on the flue gas flow path wall surface 9 between the first tube sheet 10 and the second tube sheet 11. The air inlet 3 is arranged on a flue gas flow channel wall surface 9 close to the second tube plate 11, the air outlet 4 is arranged on the flue gas flow channel wall surface 9 close to the first tube plate 10, air enters a flue gas flow channel between the first tube plate 10 and the second tube plate 11 from the air inlet 3, and is discharged from the flue gas outlet 4 after exchanging heat with the heat exchange tube 6. Preferably, the air preheating device of the embodiment is of a vertical cylindrical structure, and the air smoke enters from top to bottom and the air enters from bottom to top. In this embodiment, the flue gas channel wall surface 9 comprises a wall panel and a lining on the inside of the wall panel. Furthermore, a manhole is arranged on the wall surface 9 of the flue gas channel between the first tube plate 10 and the second tube plate 11 so as to construct a lining and other structures inside the air preheating device. Further, in order to prolong the retention time of the air and ensure that the air can fully exchange heat, a plurality of arch-shaped baffle plates 8 are arranged in a flue gas flow passage between the first tube plate 10 and the second tube plate 11. A plurality of supporting claws 7 are arranged in a flue gas flow channel between the first tube plate 10 and the second tube plate 11, and the supporting claws 7 are embedded in the lining and fixedly connected with the wall plate, such as welding. Each baffle plate 8 is fixedly connected with a plurality of supporting claws 7 through fasteners such as bolts, and the supporting claws 7 are used for positioning and supporting the baffle plate.

In the air preheating device of the embodiment, during construction, the manhole 5 at the lower part is used for entering the flue gas flow channel, and the lining and the supporting claw 7 are constructed. After the construction is finished, the arch-shaped baffle plates 8 are installed one by one from top to bottom, and after all the baffle plates are installed, the manhole door is closed, and then the heat exchange tubes 6 are sequentially penetrated.

In the present embodiment, the heat exchange tube 6 is fixedly connected with the first tube plate 10 by welding, that is, the heat exchange tube 6 is welded to the first tube plate 10 along the circumferential direction, a flexible tube plate 12 is arranged on one side of the second tube plate 11 away from the first tube plate 10, and preferably, the edge of the flexible tube plate 12 is welded to the second tube plate 11. The heat exchange tube 6 penetrates through an opening on the second tube plate 11 to be welded with the flexible tube plate 12, and the heat exchange tube 6 is not directly connected with the second tube plate 11. By arranging the flexible tube plate 12, the expansion difference between the heat exchange tube 6 and the wall plate can be effectively absorbed.

Referring to fig. 4-6, the structure of an air preheating device in another embodiment of the present invention is schematically shown. The air preheating device of this embodiment is substantially the same as the air preheating device of fig. 1 to 3, and its region is only the structure at the second tube sheet 11.

In this embodiment, the flexible tube sheet 12 is not disposed at the second tube sheet 11, but threaded holes are disposed on the second tube sheet 11, two threaded tube clamps 14 are disposed up and down in each threaded hole, a filler 13 is disposed between the threaded tube clamps 14, each heat exchange tube 6 is inserted into the threaded tube clamp 14, the filler 13 is disposed between the threaded tube clamp 14, and the threaded tube clamp 14 and the heat exchange tube 6 are sealed by the filler 13. Through the arrangement, the heat exchange tube 6 can expand downwards at the second tube plate 11 when being heated, so that the problem of poor expansion of the heat exchange tube 6 and the wall plate is effectively solved.

It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the utility model.

Claims

1. An air preheating device is characterized in that,

the air preheating device comprises a flue gas flow channel, a first tube plate and a second tube plate are arranged in the flue gas flow channel, a plurality of heat exchange tubes are arranged on the first tube plate and the second tube plate in a penetrating mode, flue gas in the flue gas flow channel enters the heat exchange tubes from heat exchange tube inlets at the first tube plate, is discharged from heat exchange tube outlets at the second tube plate and enters the flue gas flow channel again;

2. The air preheating device according to claim 1,

the wall surface of the flue gas flow channel comprises a wall plate and a lining positioned on the inner side of the wall plate;

3. Air preheating device according to claim 2,

and a plurality of baffle plates are arranged in a flue gas flow passage between the first tube plate and the second tube plate.

4. Air preheating device according to claim 3,

a plurality of supporting claws are arranged in a flue gas flow channel between the first tube plate and the second tube plate, and the supporting claws are embedded in the lining and fixedly connected with the wall plate;

each baffle plate is fixedly connected with a plurality of supporting claws through fasteners.

5. The air preheating device according to claim 1,

the heat exchange tube is welded with the first tube plate;

6. Air preheating device according to claim 5,

the edge of the flexible tubesheet is welded to the second tubesheet.

7. The air preheating device according to claim 1,

the heat exchange tube is welded with the first tube plate;

the heat exchange tube is characterized in that a plurality of threaded holes are formed in the second tube plate, two threaded tube clamps are vertically arranged in each threaded hole, a filler is arranged between the threaded tube clamps, each heat exchange tube penetrates through the corresponding threaded tube clamp, a filler is arranged between the corresponding threaded tube clamp, and the corresponding threaded tube clamp and the corresponding heat exchange tube are sealed through the filler.