CN211290559U

CN211290559U - Flue gas waste heat recovery device

Info

Publication number: CN211290559U
Application number: CN201922445706.XU
Authority: CN
Inventors: 王凌杰
Original assignee: Huzhou South Taihu Electric Power Technology Co ltd
Current assignee: Huzhou South Taihu Electric Power Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-08-18
Anticipated expiration: 2029-12-30

Abstract

The utility model discloses a flue gas waste heat recovery device, including the first heat exchange chamber and the second heat exchange chamber that distribute from top to bottom, first heat exchange chamber and second heat exchange chamber are the structure of cuboid, the upper and lower bottom surface of first heat exchange chamber and second heat exchange chamber equally divide and do not are equipped with flue gas inlet and exhanst gas outlet, the exhanst gas outlet of first heat exchange chamber is connected with the flue gas inlet of second heat exchange chamber through the heat insulating sleeve, all be equipped with snakelike water service pipe in first heat exchange chamber and the second heat exchange chamber, the both ends of water service pipe all run through a pair of lateral wall that corresponds the heat exchange chamber; the heat insulation sleeve comprises a metal inner pipe layer, a ceramic fiber fabric layer and a silicate reinforcing layer which are sequentially arranged from inside to outside. The utility model has the advantages of the heat in the coal-fired steam of ability make full use of, heat and moisture homoenergetic in the flue gas waste heat high-usage, the coal-fired flue gas obtain effectual utilization.

Description

Flue gas waste heat recovery device

Technical Field

The utility model relates to a waste heat recovery device, especially a flue gas waste heat recovery device.

Background

The coal-fired of steam power plant contains certain moisture, has higher proportion vapor in the flue gas after the burning, is the thermal main carrier of flue gas, and at present, this part flue gas is directly discharged to atmosphere or to cold sources such as river, well water after purification treatment, and not only the waste of physical sensible heat is great, and the latent heat of vaporization that high low order calorific value differs is totally wasted moreover, still can cause thermal pollution to the environment. In order to reduce the heat loss of the exhaust smoke, a condensation heat exchange device can be additionally arranged in a tail flue of the boiler, and latent heat partial waste heat and moisture of water vapor in the flue gas are recovered while sensible heat of the flue gas is recovered, so that the double effects of energy conservation and water conservation are achieved. At present, flue gas waste heat recovery systems in various forms are implemented in various large thermal power plants to different degrees, and in the implementation process, the existing waste heat recovery device is low in waste heat utilization rate of flue gas, and the return obtained by waste heat recovery can only reluctantly keep the implementation cost. Therefore, a set of flue gas waste heat recovery device with higher waste heat utilization rate needs to be developed to more fully utilize heat and moisture in the coal-fired flue gas and provide forward benefits for enterprises.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a flue gas waste heat recovery device. The coal-fired flue gas waste heat utilization device has the advantages that the heat in the coal-fired hot gas can be fully utilized, the flue gas waste heat utilization rate is high, and the heat and the moisture in the coal-fired flue gas can be effectively utilized.

The technical scheme of the utility model: the flue gas waste heat recovery device comprises a first heat exchange chamber and a second heat exchange chamber which are vertically distributed, wherein the first heat exchange chamber and the second heat exchange chamber are both in a cuboid structure, the upper bottom surface and the lower bottom surface of the first heat exchange chamber and the lower bottom surface of the second heat exchange chamber are respectively provided with a flue gas inlet and a flue gas outlet, the flue gas outlet of the first heat exchange chamber is connected with the flue gas inlet of the second heat exchange chamber through a heat insulation sleeve, the first heat exchange chamber and the second heat exchange chamber are respectively internally provided with a snakelike water through pipe, and two ends of the water through pipe penetrate through a pair of side walls of the corresponding heat; the heat insulation sleeve comprises a metal inner pipe layer, a ceramic fiber fabric layer and a silicate reinforcing layer which are sequentially arranged from inside to outside.

In the flue gas waste heat recovery device, the length of the heat insulation sleeve between the first heat exchange chamber and the second heat exchange chamber is 8-15 cm.

In the flue gas waste heat recovery device, the flue gas outlet is located at the center of the bottom of the corresponding heat exchange chamber, and the bottom surface of the corresponding heat exchange chamber is of a conical surface structure with gradually decreasing height from the edge to the center.

In the flue gas waste heat recovery device, the edges and corners at the bottoms of the first heat exchange chamber and the second heat exchange chamber are connected and transited by smooth curved surfaces.

In the flue gas waste heat recovery device, the flue gas inlet of the first heat exchange chamber and the flue gas outlet of the second heat exchange chamber are both connected with a heat insulation sleeve.

In the flue gas waste heat recovery device, the outer side of the pipe wall of the water pipe corresponding to the part outside the heat exchange chamber is sleeved with the glass fiber heat insulation sleeve.

Compared with the prior art, the utility model discloses a two heat exchange chambers of cuboid structure retrieve the flue gas waste heat, wherein, the upper and lower face of two heat exchange chambers all is equipped with flue gas import and export, two heat exchange chambers are established ties mutually, the flue gas carries out the two-stage heat transfer, all be equipped with snakelike water service pipe in each heat exchange chamber, two heat exchange chambers all let in low temperature boiler demineralized water, carry out primary heating to the demineralized water, the two-stage heat transfer of two exchange chambers can make the heat in the flue gas obtain more abundant utilization, flue gas waste heat utilization rate is high; the flue gas outlet of the first heat exchange chamber is connected with the flue gas inlet of the second heat exchange chamber through a heat insulation sleeve, and the heat of the flue gas can be effectively prevented from losing between the two heat exchange chambers by using the heat insulation sleeve; the heat insulation sleeve comprises a metal inner tube layer, a ceramic fiber fabric layer and a silicate reinforcing layer which are sequentially arranged from inside to outside, so that the heat insulation sleeve is good in heat insulation effect, high in structural strength and long in service life.

Furthermore, the length of a heat insulation sleeve between the first heat exchange chamber and the second heat exchange chamber is 8-15cm, the distance between the two heat exchange chambers is short, and the loss of the heat of the flue gas between the two heat exchange chambers is small; the smoke outlet is positioned at the center of the bottom of the corresponding heat exchange chamber, and the bottom surface of the corresponding heat exchange chamber is of a conical surface structure with the height gradually decreasing from the edge to the center, so that condensed water can flow down and be recovered conveniently; the edges and edges at the bottoms of the first heat exchange chamber and the second heat exchange chamber are connected and transited by smooth curved surfaces, so that accumulated water at the edges and edges can be effectively avoided.

In addition, the flue gas inlet of the first heat exchange chamber and the flue gas outlet of the second heat exchange chamber are both connected with heat insulation sleeves for heat insulation and heat preservation of the flue gas; the water pipe is sleeved with a glass fiber heat-insulating sleeve at the outer side of the pipe wall of the part of the water pipe corresponding to the outside of the heat exchange chamber, and the heat insulation is carried out on the demineralized water.

To sum up, the utility model has the advantages of heat in the coal-fired steam of ability make full use of, heat and moisture homoenergetic in the flue gas waste heat high-usage, the coal-fired flue gas obtain effectual utilization.

Drawings

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

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

fig. 3 is a partial enlarged view of fig. 1 at B.

Reference numerals: 1-a first heat exchange chamber, 2-a second heat exchange chamber, 3-an insulating sleeve, 4-a water pipe, 31-a metal inner pipe layer, 32-a ceramic fiber fabric layer, 33-a silicate reinforcing layer and 41-a glass fiber insulating sleeve.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Example (b): the flue gas waste heat recovery device is structurally shown in fig. 1 to 3 and comprises a first heat exchange chamber 1 and a second heat exchange chamber 2 which are distributed up and down, wherein the first heat exchange chamber 1 and the second heat exchange chamber 2 are both in a cuboid structure, the upper bottom surface and the lower bottom surface of the first heat exchange chamber 1 and the lower bottom surface of the second heat exchange chamber 2 are respectively provided with a flue gas inlet and a flue gas outlet, the flue gas outlet of the first heat exchange chamber 1 is connected with the flue gas inlet of the second heat exchange chamber 2 through a heat insulation sleeve 3, the heat insulation sleeve 3 can effectively avoid the loss of flue gas heat between the two heat exchange chambers, serpentine water service pipes 4 are respectively arranged in the first heat exchange chamber 1 and the second heat exchange chamber 2, and two ends of each water service pipe 4 penetrate through a pair of side walls of the corresponding heat exchange chamber and are; the heat insulation sleeve 3 comprises a metal inner pipe layer 31, a ceramic fiber fabric layer 32 and a silicate reinforcing layer 33 which are sequentially arranged from inside to outside, so that the heat insulation effect is good, the structural strength of the heat insulation sleeve 3 is high, and the service life is long.

The length of the heat insulation sleeve 3 between the first heat exchange chamber 1 and the second heat exchange chamber 2 is 10cm, the distance between the two heat exchange chambers is short, and the loss of the heat of the flue gas between the two heat exchange chambers is small.

The flue gas outlet is positioned at the center of the bottom of the corresponding heat exchange chamber, and the bottom surface of the corresponding heat exchange chamber is of a conical surface structure with gradually decreasing height from the edge to the center, so that condensed water can be conveniently recovered by flowing down.

Edges and edges at the bottoms of the first heat exchange chamber 1 and the second heat exchange chamber 2 are connected and transited by smooth curved surfaces, and accumulated water at the edges and the edges can be effectively avoided.

And the flue gas inlet of the first heat exchange chamber 1 and the flue gas outlet of the second heat exchange chamber 2 are both connected with a heat insulation sleeve 3 for heat insulation and heat preservation of flue gas.

The water pipe 4 is sleeved with a glass fiber heat-insulating sleeve 41 on the outer side of the pipe wall of the part corresponding to the outside of the heat exchange chamber, and is used for insulating heat of the desalted water.

The utility model discloses a theory of operation: during operation, the water service pipe 4 of first heat exchange chamber 1 and second heat exchange chamber 2 is intake and is held and let in microthermal boiler demineralized water in step, import high temperature flue gas from the flue gas inlet of first heat exchange chamber 1, carry out the one-level heat transfer in first heat exchange chamber 1, the comdenstion water and the flue gas after the heat transfer are exported from the exhanst gas outlet of first heat exchange chamber 1, import to second heat exchange chamber 2 through heat insulating sleeve 3, carry out the second grade heat transfer in second heat exchange chamber 2, the comdenstion water and the flue gas after the heat transfer are exported from the exhanst gas outlet of second heat exchange chamber 2, realize abundant heat transfer and retrieve the comdenstion water.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Claims

1. Flue gas waste heat recovery device, its characterized in that: the heat exchanger comprises a first heat exchange chamber (1) and a second heat exchange chamber (2) which are distributed up and down, wherein the first heat exchange chamber (1) and the second heat exchange chamber (2) are both of cuboid structures, the upper bottom surface and the lower bottom surface of the first heat exchange chamber (1) and the lower bottom surface of the second heat exchange chamber (2) are respectively provided with a flue gas inlet and a flue gas outlet, the flue gas outlet of the first heat exchange chamber (1) is connected with the flue gas inlet of the second heat exchange chamber (2) through a heat insulation sleeve (3), the first heat exchange chamber (1) and the second heat exchange chamber (2) are both internally provided with a snake-shaped water service pipe (4), and two ends of the water service pipe (4) penetrate through a pair of side walls of the; the heat insulation sleeve (3) comprises a metal inner pipe layer (31), a ceramic fiber fabric layer (32) and a silicate reinforcing layer (33) which are sequentially arranged from inside to outside.

2. The flue gas waste heat recovery device according to claim 1, characterized in that: the length of the heat insulation sleeve (3) between the first heat exchange chamber (1) and the second heat exchange chamber (2) is 8-15 cm.

3. The flue gas waste heat recovery device according to claim 1, characterized in that: the flue gas outlet is positioned at the center of the bottom of the corresponding heat exchange chamber, and the bottom surface of the corresponding heat exchange chamber is of a conical surface structure with the height gradually decreasing from the edge to the center.

4. The flue gas waste heat recovery device according to claim 1, characterized in that: the edges and corners of the bottoms of the first heat exchange chamber (1) and the second heat exchange chamber (2) are connected and transited by smooth curved surfaces.

5. The flue gas waste heat recovery device according to claim 1, characterized in that: and the flue gas inlet of the first heat exchange chamber (1) and the flue gas outlet of the second heat exchange chamber (2) are both connected with a heat insulation sleeve (3).

6. The flue gas waste heat recovery device according to claim 1, characterized in that: the outer side of the pipe wall of the water pipe (4) corresponding to the part outside the heat exchange chamber is sleeved with a glass fiber heat-insulating sleeve (41).