CN209978076U

CN209978076U - Flue gas heat exchanger

Info

Publication number: CN209978076U
Application number: CN201920508545.1U
Authority: CN
Inventors: 张培杰; 赵树春; 张继文; 马明辉; 李聪辉; 张贺
Original assignee: Huaneng Luoyang Thermal Power Co Ltd
Current assignee: Huaneng Luoyang Thermal Power Co Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2020-01-21
Anticipated expiration: 2029-04-12

Abstract

The utility model discloses a flue gas heat exchanger, including cylindric casing, in casing axial both ends have linked firmly into smoke chamber and smoke exhaust chamber respectively, it has into the tobacco pipe and the pipe of discharging fume to advance smoke chamber and smoke exhaust chamber intercommunication respectively, in be equipped with the flue gas pipe that a plurality of both ends are linked together respectively with advancing smoke chamber and smoke exhaust chamber in the casing evenly, each the flue gas pipe is followed the axis of casing extends, in the casing is close to the outside cover of one end tip department of smoke exhaust chamber has the equal trachea that the intercommunication has the annular of intake pipe, equal trachea through the even communicating pipe that sets up of circumference of a plurality of along the casing with casing intercommunication, each communicating pipe by equal trachea orientation the smoke exhaust chamber extends, in the casing is close to the one end tip department intercommunication of advancing the smoke chamber has the outlet duct. The utility model has the characteristics of improve power boiler heat exchange efficiency of discharging fume, be applicable to power boiler flue gas thermal recycle.

Description

Flue gas heat exchanger

Technical Field

The utility model belongs to the technical field of power plant's electricity generation in-process energy utilization, specifically speaking relates to a gas heater.

Background

With the gradual deterioration of environmental climate, the development of low-carbon economy and the promotion of sustainable development become inevitable choices for the future development of human society. Only about 35% of heat energy in a thermal power plant is converted into electric energy, and more than 60% of energy is dissipated to the atmospheric environment, so that the circulating heat efficiency of the power plant is low. The heat loss of the exhaust smoke in various heat losses of the thermal power plant accounts for the main part, and accounts for 70-80% of the heat loss.

SUMMERY OF THE UTILITY MODEL

The utility model provides an improve flue gas heat exchanger of power boiler heat exchange efficiency of discharging fume.

In order to achieve the above object, the utility model adopts the following technical scheme:

the utility model provides a flue gas heat exchanger, includes cylindric casing, in casing axial both ends have linked firmly into smoke chamber and smoke exhaust chamber respectively, it has into tobacco pipe and the pipe of discharging fume to advance smoke chamber and smoke exhaust chamber respectively to communicate, in be equipped with the flue gas pipe that a plurality of both ends are linked together with advancing smoke chamber and smoke exhaust chamber respectively evenly in the casing, each the flue gas pipe is followed the axis of casing extends, in the casing is close to the outside cover of the one end tip department of smoke exhaust chamber has the annular gas equalizing pipe that communicates there is the intake pipe, gas equalizing pipe through a plurality of along the even communicating pipe that sets up of circumference of casing with the casing intercommunication, each communicating pipe by gas equalizing pipe orientation smoke exhaust chamber extends, in the casing is close to the one end tip department intercommunication of smoke intake chamber has the outlet duct.

Further, the flue gas pipe includes one end with advance the first body and one end of smoke chamber intercommunication with the second body of smoke chamber intercommunication, the radius of first body is less than the radius of second body, just the one end that first body and second body are close to each other is through reducing union coupling.

Furthermore, a buffering screen plate is fixedly arranged at one end of the shell, which is close to the smoke exhaust chamber, and the edge of the buffering screen plate is fixedly connected with the inner wall of the shell.

Furthermore, the buffering otter board is the arc structure, the arc structure is followed the axis of casing is to advance the cigarette chamber arch.

Furthermore, the number of the buffer screen plates is at least two, and the at least two buffer screen plates are arranged at intervals along the axial direction of the shell.

Furthermore, the pipe diameter of the communicating pipe is gradually enlarged from the air equalizing pipe to the extending direction of the shell.

The utility model discloses owing to adopted foretell structure, it compares with prior art, and the technical progress who gains lies in: the smoke exhaust chamber is used for accumulating smoke from the smoke pipes and discharging the smoke through a smoke exhaust pipe; the utility model discloses a gas stove, including casing, gas inlet pipe, gas outlet pipe, gas inlet pipe, gas outlet pipe, gas.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a partial sectional view of the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a flue gas pipe according to an embodiment of the present invention.

Labeling components: 1-shell, 2-smoke inlet chamber, 3-smoke exhaust chamber, 4-smoke inlet pipe, 5-smoke exhaust pipe, 6-gas equalizing pipe, 7-communicating pipe, 8-gas inlet pipe, 9-gas outlet pipe, 10-smoke pipe, 1001-first pipe, 1002-second pipe and 11-buffer screen plate.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.

Embodiment of a flue gas heat exchanger

The embodiment discloses a flue gas heat exchanger, as shown in fig. 1 and 2, comprising a cylindrical shell 1, wherein a flue gas inlet chamber 2 and a flue gas outlet chamber 3 are respectively welded at two axial ends of the shell 1, and the flue gas inlet chamber 2 and the flue gas outlet chamber 3 are respectively communicated with a flue gas inlet pipe 4 and a flue gas outlet pipe 5. A plurality of flue gas pipes 10 with two ends respectively communicated with the flue gas inlet chamber 2 and the flue gas exhaust chamber 3 are uniformly arranged in the shell 1, and each flue gas pipe 10 extends along the axis of the shell 1. In this embodiment, in order to enable the flue gas to sufficiently exchange heat with the air in the housing 1 through the flue gas pipe 10 in the flue gas pipe 10, as shown in fig. 3, the flue gas pipe 10 includes a first pipe 1001 having one end communicated with the flue gas inlet chamber 2 and a second pipe 1002 having one end communicated with the flue gas outlet chamber 3, wherein the radius of the first pipe 1001 is smaller than that of the second pipe 1002, and the ends of the first pipe 1001 and the second pipe 1002, which are close to each other, are connected through a reducer; like this, the flue gas is passed through the reducing pipe by first body 1001 and is got into second body 1002, and the pressure of flue gas diminishes, and the velocity of flow slows down for flue gas and air heat exchange time increase, and the radius of second body 1002 is great, and the air increases with the heat exchange area of second body 1002, improves heat exchange efficiency from this.

In order to make the air uniformly enter the casing 1 and be sufficiently heated, as shown in fig. 1, an annular air equalizing pipe 6 is sleeved outside the end part of the casing 1 near the smoke discharging chamber 3, an air inlet pipe 8 is communicated with the air equalizing pipe 6, and the air equalizing pipe 6 is communicated with the casing 1 through a plurality of communicating pipes 7 uniformly arranged along the circumferential direction of the casing 1. Every communicating pipe 7 of this embodiment is extended towards smoke exhaust chamber 3 by equal trachea 6, like this, the air sprays on the inner wall that casing 1 and smoke exhaust chamber 3 are connected after getting into casing 1 through communicating pipe 7, the kinetic energy of air takes place the refraction after being absorbed most by casing 1, the air that gets into casing 1 by all directions takes place the refraction back interact and spreads evenly in casing 1 near smoke exhaust chamber 3's one end tip department, and slow down to the intercommunication at casing 1 near the outlet duct 9 of the one end tip department of entering smoke exhaust chamber 2 flow, and then the heat exchange of extension air and flue gas is long, improve air and flue gas heat exchange efficiency. This embodiment is for reducing the velocity of flow of air admission casing 1, reduces the impact of air to casing 1 inner wall, and the pipe diameter of communicating pipe 7 is gradually expanded to casing 1 extending direction by equal trachea 6, so, the air is by equal trachea 6 behind communicating pipe 7 velocity of flow diminish, and disperse behind the entering casing 1 to make air more evenly distributed in casing 1, improved the heat exchange efficiency of air and flue gas.

In order to further slow down the flow velocity of air in the housing 1, a buffer mesh plate 11 is fixedly installed at one end of the housing 1 close to the smoke evacuation chamber 3, and the edge of the buffer mesh plate 11 is fixedly welded to the inner wall of the housing 1, wherein the number of the buffer mesh plates 11 may be two or more, and the buffer mesh plates 11 are arranged at intervals along the axial direction of the housing 1. In this embodiment, in order to improve the air blocking and decelerating effect of the buffering mesh plate 11, the buffering mesh plate 11 is an arc-shaped structure (not shown in the figure), and the arc-shaped structure protrudes towards the smoke inlet chamber 2 along the axis of the casing 1.

The embodiment of the utility model provides a working process as follows:

the smoke exhaust flue gas of the power plant boiler enters the smoke inlet chamber 2 from the smoke inlet pipe 4, the smoke is uniformly distributed in the smoke inlet chamber 2 and enters the smoke exhaust chamber 3 through the smoke pipes 10, and the smoke exhaust chamber 3 is used for accumulating the smoke from the smoke pipes 10 and exhausting the smoke through the smoke exhaust pipe 5; air enters the air equalizing pipe 6 from the air inlet pipe 8, is uniformly distributed by the air equalizing pipe 6 and then enters the shell 1 through the communicating pipes 7, the air entering the shell 1 is sprayed on the inner wall of the shell 1 connected with the smoke exhaust chamber 3, and after most of kinetic energy of the air is absorbed by the shell 1, the air slowly flows to the air outlet pipe 9, so that the heat exchange efficiency of the air and smoke is improved; and because the flowing direction of the air in the shell 1 is opposite to the flowing direction of the smoke, the heat exchange between the smoke and the air is facilitated.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the protection of the claims of the present invention.

Claims

1. A kind of flue gas heat exchanger, characterized by: including cylindric casing, in casing axial both ends have linked firmly into smoke chamber and smoke exhaust chamber respectively, it has into tobacco pipe and the pipe of discharging fume to advance the smoke chamber and the room of discharging fume to communicate respectively, in be equipped with the flue gas pipe that a plurality of both ends are linked together with advancing the smoke chamber and the room of discharging fume respectively uniformly in the casing, each the flue gas pipe is followed the axis of casing extends, in the casing is close to the outside cover of the one end tip department of smoke exhaust chamber has the annular equal trachea that the intercommunication has the intake pipe, equal trachea through a plurality of along the even communicating pipe that sets up of circumference of casing with the casing intercommunication, each communicating pipe by equal trachea orientation smoke exhaust chamber extends, in the casing is close to the one end tip department intercommunication of advancing the smoke chamber has the outlet duct.

2. A flue gas heat exchanger according to claim 1, wherein: the flue gas pipe comprises a first pipe body and a second pipe body, wherein one end of the first pipe body is communicated with the flue gas inlet chamber, one end of the second pipe body is communicated with the flue gas outlet chamber, the radius of the first pipe body is smaller than that of the second pipe body, and the end, close to the second pipe body, of the first pipe body is connected with the end, close to the second pipe body, of the second pipe body through a reducing pipe.

3. A flue gas heat exchanger according to claim 1, wherein: and a buffer screen plate is fixedly arranged at one end of the shell, which is close to the smoke exhaust chamber, and the edge of the buffer screen plate is fixedly connected with the inner wall of the shell.

4. A flue gas heat exchanger according to claim 3, wherein: the buffering otter board is the arc structure, the arc structure is followed the axis of casing is to advance the cigarette room arch.

5. A flue gas heat exchanger according to claim 3, wherein: the number of the buffer screen plates is at least two, and the at least two buffer screen plates are arranged at intervals along the axial direction of the shell.

6. A flue gas heat exchanger according to claim 1, wherein: the pipe diameter of the communicating pipe is gradually expanded from the gas equalizing pipe to the extending direction of the shell.