CN212205689U

CN212205689U - Waste heat step recovery flue heat exchange tube

Info

Publication number: CN212205689U
Application number: CN202020120602.1U
Authority: CN
Inventors: 司岭; 吴栋华
Original assignee: Jiangsu Hengfeng Annex Polytron Technologies Inc
Current assignee: Jiangsu Hengfeng Annex Polytron Technologies Inc
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-12-22
Anticipated expiration: 2030-01-19

Abstract

The utility model provides a waste heat ladder recovery flue heat exchange tube, which comprises a flue, wherein a waste heat recovery tube is sleeved outside the flue, the waste heat recovery tube and the flue are arranged coaxially, an annular waste heat recovery channel is formed between the waste heat recovery tube and the flue, and the outer wall of the waste heat recovery tube is provided with a heat preservation layer; the outer wall of the flue is provided with a plurality of heat conduction fin groups; the heat conduction fin groups are uniformly distributed on the outer wall of the flue; the heat conducting sheet set comprises a pair of arc-shaped heat conducting sheets, the surface, protruding outwards, of each arc-shaped heat conducting sheet faces towards the outer wall of the flue, the arc-shaped heat conducting sheets are symmetrically arranged, one ends of the arc-shaped heat conducting sheets are fixed ends, the fixed ends are fixedly connected to the outer wall of the flue, the other ends of the arc-shaped heat conducting sheets are free ends, the free ends are far away from the outer wall of the flue and point to the waste heat recovery pipe, a gap is reserved between the free ends and the inner wall of the waste heat. The utility model discloses a set up heat conduction fin group, improved heat exchange efficiency.

Description

Waste heat step recovery flue heat exchange tube

Technical Field

The utility model discloses waste heat recovery technical field specifically is waste heat ladder recovery flue heat exchange tube.

Background

The heating furnace is main energy consumption equipment of iron and steel enterprises, and the smoke exhaust temperature of the heating furnace can be greatly reduced and the heat efficiency of the heating furnace is improved by adopting a smoke waste heat recovery technology. The heat exchange of the existing waste heat step recovery flue mainly utilizes the principle of a heat exchanger and the heat transfer of an internal flue. But the flue heat transfer efficiency is lower, can not in time conduct the outside waste heat recovery passageway with the heat.

Disclosure of Invention

To the technical problem, the utility model provides a waste heat ladder recovery flue heat exchange tube can improve heat exchange efficiency.

The specific technical scheme is as follows:

the waste heat stepped recovery flue heat exchange tube comprises a flue, wherein a waste heat recovery tube is sleeved outside the flue, the waste heat recovery tube and the flue are arranged coaxially, an annular waste heat recovery channel is formed between the waste heat recovery tube and the flue, and a heat insulation layer is arranged on the outer wall of the waste heat recovery tube;

the outer wall of the flue is provided with a plurality of heat conduction fin groups; the heat conduction fin groups are uniformly distributed on the outer wall of the flue;

the heat conducting sheet group comprises a pair of arc-shaped heat conducting sheets, one surface of each arc-shaped heat conducting sheet, which protrudes outwards, faces towards the outer wall of the flue, the pair of arc-shaped heat conducting sheets are symmetrically arranged, one end of each arc-shaped heat conducting sheet is a fixed end, the fixed end is fixedly connected to the outer wall of the flue, the other end of each arc-shaped heat conducting sheet is a free end, the free end is far away from the outer wall of the flue and points to the waste heat recovery pipe, a gap is reserved between the inner wall of the free end and.

The heat recovery device further comprises a U-shaped heat conducting fin, wherein the U-shaped heat conducting fin is positioned between the pair of arc-shaped heat conducting fins of the heat conducting fin group, the opening of the U-shaped heat conducting fin faces the inner wall of the waste heat recovery pipe, the two ends of the opening of the U-shaped heat conducting fin are respectively fixedly connected with the free ends of the pair of arc-shaped heat conducting fins, and the bottom of the U-shaped heat conducting fin is fixed on the outer wall of the flue.

Preferably, a heat conduction net is filled between the pair of arc-shaped heat conduction sheets and the middle U-shaped heat conduction sheet, and the heat conduction net is perpendicular to the axial lead of the flue.

The utility model provides a waste heat ladder recovery flue heat exchange tube has improved heat exchange efficiency through setting up heat conduction fin group.

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 the drawings without creative efforts.

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the local enlarged structure of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Wherein like reference numerals refer to like parts throughout.

In addition, if a detailed description of the known art is not necessary to show the features of the present invention, it is omitted. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the waste heat stepped recovery flue heat exchange tube comprises a flue 1, a waste heat recovery tube 2 is sleeved outside the flue 1, the waste heat recovery tube 2 and the flue 1 are arranged coaxially, an annular waste heat recovery channel is formed between the waste heat recovery tube 2 and the flue 1, and an insulating layer 3 is arranged on the outer wall of the waste heat recovery tube 2;

the outer wall of the flue 1 is provided with a plurality of heat conduction fin groups; the heat conduction fin groups are uniformly distributed on the outer wall of the flue 1;

the heat conducting sheet group include a pair of arc heat conducting sheet 4, the one side of 4 evaginations of every arc heat conducting sheet is towards 1 outer wall of flue, a pair of arc heat conducting sheet 4 symmetry sets up, and the one end of arc heat conducting sheet 4 is the stiff end, stiff end fixed connection at 1 outer wall of flue, the other end is the free end, the free end is kept away from 1 outer wall of flue and is pointed to waste heat recovery pipe 2, leaves the clearance between the inner wall of free end and waste heat recovery pipe 2, leaves the clearance between 4 free ends of a pair of arc heat conducting sheet.

As shown in fig. 2, the flue gas waste heat recovery device further comprises a U-shaped heat conducting fin 5, the U-shaped heat conducting fin 5 is located between the pair of arc-shaped heat conducting fins 4 of the heat conducting fin group, the opening of the U-shaped heat conducting fin 5 faces the inner wall of the waste heat recovery pipe 2, two ends of the opening of the U-shaped heat conducting fin 5 are respectively fixedly connected with the free ends of the pair of arc-shaped heat conducting fins 4, and the bottom of the U-shaped heat conducting fin 5 is fixed on the outer wall of the.

And a heat conduction net 8 is filled between the pair of arc-shaped heat conduction sheets 4 and the middle U-shaped heat conduction sheet 5, and the heat conduction net 8 is vertical to the axial lead of the flue 1.

This heat conduction piece group mainly increases heat conduction efficiency through two aspects:

firstly, the heat transfer area is increased, and the heat transfer contact surface is increased through the arc-shaped heat conducting fins 4 and the U-shaped heat conducting fins 5 and is larger than the surface heat diffusion area of the flue 1.

Secondly, a large U-shaped heat conduction space 7 is formed between adjacent arc-shaped radiating fins 4, the arc-shaped radiating fins 4 are mainly used for heating a cold air source, small U-shaped heat conduction spaces 6 are formed in the U-shaped heat conducting fins 5, the space is small, particularly, the opening distance of the U-shaped heat conducting fins 5 can be smaller than the width of the bottoms of the U-shaped heat conducting fins 5, the bottoms of the U-shaped heat conducting fins 5 are in contact heat conduction with a flue 1, therefore, the air temperature at the bottoms of the U-shaped heat conducting fins 5 is high, the small U-shaped heat conduction spaces 6 can form a chimney structure, a chimney effect is generated, hot air flows towards the bottoms of the U-shaped heat conducting fins 5 to the large U-shaped heat conduction spaces 7 from the openings, the air in the large U-shaped heat conduction spaces 7 is disturbed.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims

1. The waste heat stepped recovery flue heat exchange tube comprises a flue, wherein a waste heat recovery tube is sleeved outside the flue, the waste heat recovery tube and the flue are arranged coaxially, an annular waste heat recovery channel is formed between the waste heat recovery tube and the flue, and a heat insulation layer is arranged on the outer wall of the waste heat recovery tube;

the heat-conducting plate is characterized in that a plurality of heat-conducting fin groups are arranged on the outer wall of the flue; the heat conduction fin groups are uniformly distributed on the outer wall of the flue;

the heat conduction fin group include a pair of arc conducting strip, the one side of every arc conducting strip evagination is towards the flue outer wall, a pair of arc conducting strip symmetry sets up, the one end of arc conducting strip is the stiff end, stiff end fixed connection in the flue outer wall, the other end is the free end, the flue outer wall is kept away from to the free end and directional waste heat recovery pipe, leave the clearance between the inner wall of free end and waste heat recovery pipe, leave the clearance between a pair of arc conducting strip free end.

2. The stepped waste heat recovery flue heat exchange tube of claim 1, further comprising a U-shaped heat conducting fin, wherein the opening of the U-shaped heat conducting fin faces the inner wall of the waste heat recovery tube, the U-shaped heat conducting fin is located between the pair of arc-shaped heat conducting fins of the heat conducting fin set, both ends of the opening of the U-shaped heat conducting fin are fixedly connected with the free ends of the pair of arc-shaped heat conducting fins respectively, and the bottom of the U-shaped heat conducting fin is fixed on the outer wall of the flue.

3. The stepped waste heat recovery flue heat exchange tube of claim 2, wherein a heat conducting mesh is filled between the pair of arc-shaped heat conducting fins and the middle U-shaped heat conducting fin, and the heat conducting mesh is perpendicular to the axial line of the flue.