CN218097308U

CN218097308U - Radial heat pipe type low-temperature economizer

Info

Publication number: CN218097308U
Application number: CN202222084208.9U
Authority: CN
Inventors: 杨恪; 刘龙
Original assignee: Jinan Shanyuan Environmental Protection Technology Co ltd; Hengyuan Intelligent Technology Shandong Co ltd
Current assignee: Jinan Shanyuan Environmental Protection Technology Co ltd; Hengyuan Intelligent Technology Shandong Co ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-12-20
Anticipated expiration: 2032-08-09

Abstract

The utility model discloses a radial heat pipe formula low temperature economizer. The economizer includes: the heat pipe comprises a frame body and a radial heat pipe horizontally fixed on the frame body. The radial heat pipe comprises an inner pipe, an outer pipe and a heat exchange working medium. The outer pipe is sleeved on the inner pipe, two ends of the inner pipe penetrate through two ends of the outer pipe respectively, and the end portion of the outer pipe is connected with the outer wall of the inner pipe in a sealing mode. The heat exchange working medium is positioned at the bottom of the accommodating cavity between the inner pipe and the outer pipe. The radial heat pipes are distributed along the height direction of the frame body, the outlet of the radial heat pipe of the upper layer is connected with the inlet of the radial heat pipe of the lower layer, the outlet of the radial heat pipe of the lower layer is connected with the inlet of the radial heat pipe of the next layer, and the radial heat pipes are communicated in a coil structure in a reciprocating mode. The low-temperature economizer utilizes the radial heat pipe heat exchanger as a core heat exchange part of the low-temperature economizer, so that the heat exchange efficiency is high, the flue gas and the cooling water are effectively separated, and the effects of abrasion resistance and leakage prevention are achieved.

Description

Radial heat pipe type low-temperature economizer

Technical Field

The utility model relates to a flue gas treatment field especially relates to a radial heat pipe formula low temperature economizer.

Background

Coal-fired thermal power generation is still the main source of electric power in China, and flue gas discharged by a coal-fired unit contains a large amount of pollutants which seriously affect the production and living environment of people and need to be comprehensively treated. With the comprehensive implementation of ultra-low emission of flue gas of coal-fired power plants, the emission of conventional atmospheric pollutants is effectively controlled. The flue gas cooperative treatment technical route taking the low-low temperature electric dust collector as the core is taken as one of the typical technical routes of ultralow emission of the coal-fired flue gas in China, and can economically and efficiently realize ultralow emission of the flue gas of the coal-fired power plant, utilization of the waste heat of the flue gas and improvement of the dust removal efficiency, so that the flue gas cooperative treatment technical route is widely applied. The low-temperature economizer is one of the most important devices of the low-temperature and low-temperature electric dust removal system and is widely applied to domestic coal-electric machine sets. However, the current product has a plurality of defects: because the low-temperature economizer must operate at the inlet end of the dust remover, the high-concentration smoke environment is difficult to avoid, but under the actions of scouring wear, low-temperature corrosion, alternating stress, water impact and the like of sulfur-containing and dust-containing gas, the heat exchange tube in the low-temperature economizer is gradually thinned, and finally the problem of leakage of cooling water occurs, so that the safe operation of a unit is seriously influenced.

SUMMERY OF THE UTILITY MODEL

To the heat exchange tube attenuate gradually in the foretell low temperature economizer, the problem of revealing of cooling water finally appears, the utility model provides a radial heat pipe formula low temperature economizer, it utilizes radial heat pipe exchanger as the core heat transfer part of low temperature economizer, and not only heat exchange efficiency is high, effectively separates flue gas and cooling water moreover and comes, has reached the abrasionproof and has prevented the effect of leaking. In order to achieve the above object, the technical solution of the present invention is as follows.

A radial heat pipe type low temperature economizer comprising: the heat pipe comprises a frame body and a radial heat pipe horizontally fixed on the frame body. The radial heat pipe includes: inner tube, outer tube and heat transfer working medium. Wherein: the outer pipe is sleeved on the inner pipe, two ends of the inner pipe penetrate through two ends of the outer pipe respectively, and the end portion of the outer pipe is connected with the outer wall of the inner pipe in a sealing mode. The heat exchange working medium is positioned at the bottom of the accommodating cavity between the inner pipe and the outer pipe.

Furthermore, a plurality of groups of radial heat pipes are distributed along the height direction of the rack body so as to increase the cooling effect on the flue gas.

Furthermore, in the plurality of groups of radial heat pipes, the outlet of the radial heat pipe on the upper layer is connected with the inlet of the radial heat pipe on the lower layer, the outlet of the radial heat pipe on the lower layer is connected with the inlet of the radial heat pipe on the next layer, and the radial heat pipes are communicated in a coil-shaped structure in a reciprocating manner.

Further, fins are arranged on the outer wall of the outer pipe, so that the heat exchange area between the outer pipe and the passing flue gas is increased, and the heat exchange efficiency is increased.

Further, the fins are distributed along the length direction of the outer pipe and are vertically arranged, so that dust is not easy to accumulate.

Furthermore, the fins are fixed on the top surface and the lower surface of the outer wall of the outer pipe, so that the heat exchange area is further increased.

Further, the accommodating cavity between the inner tube and the outer tube is in a vacuum state. Optionally, the vacuum degree is 1.2 × 10 ^-3 ～1.5×10 ^-4 Pa。

Furthermore, the height of the heat exchange working medium is lower than the bottom surface of the inner pipe, namely the bottom surface of the inner pipe is not in contact with the liquid level of the heat exchange working medium.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a radial heat pipe formula low temperature economizer adopts radial heat pipe exchanger as the core heat transfer part of low temperature economizer, and not only heat exchange efficiency is high, effectively separates flue gas and cooling water moreover, has reached the abrasionproof and has prevented the effect of leaking. Because: on one hand, the radial heat pipe can transfer heat energy with high efficiency because the radial heat pipe utilizes two processes of absorption and release of phase-change heat transfer in the heat transfer science. On the other hand, because the outer pipe is still separated before the cooling water in the flue gas and the inner pipe, when the outer pipe is broken and leaked due to scouring, only the heat exchange working medium in the outer pipe is leaked into the flue gas, and because the amount is very small, the heat exchange working medium is volatilized quickly, and the flue gas can not be influenced too much. And the inner pipe is not easy to be washed by smoke due to the protection of the outer pipe, thereby achieving the effects of abrasion resistance and leakage prevention.

Drawings

Fig. 1 is a schematic structural diagram of a gravity assisted heat pipe low-temperature economizer in the following embodiment.

Fig. 2 is a schematic view of the inside of a radial heat pipe in the following embodiment.

FIG. 3 is a schematic cross-sectional view of a radial heat pipe in the following example.

The labels in the figures represent: 1-frame body, 2-radial heat pipe, 201-inner pipe, 202-outer pipe, 203-heat exchange working medium, 204-accommodating cavity, 205-water inlet pipe, 206-water outlet pipe, 3-fin, 4-communicating pipe and 5-shell body.

Detailed Description

It should be noted that in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and do not limit the structure, but merely facilitate the description of the present invention, and do not indicate or imply that the device or element referred to needs to have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The technical solution of the present invention will be further explained with reference to the drawings and embodiments of the specification.

Referring to fig. 1, there is illustrated a radial heat pipe type low-temperature economizer, which mainly comprises: the heat pipe comprises a frame body 1 and a radial heat pipe 2 horizontally fixed on the frame body 1. Referring to fig. 2 and 3, the radial heat pipe 2 includes: an inner pipe 201, an outer pipe 202 and a heat exchange working medium 203. Wherein: the outer tube 202 is sleeved on the inner tube 201, two ends of the inner tube 201 respectively penetrate through two end faces of the outer tube 202, and the end face of the outer tube 202 is connected with the outer wall of the inner tube 201 in a sealing mode. For example, when the inner pipe 201 and the outer pipe 202 are both stainless steel pipes, the end surface of the outer pipe 202 and the outer wall of the inner pipe 201 are hermetically connected by welding. The heat exchange working medium 203 is located at the bottom of the accommodating cavity 204 between the inner pipe 201 and the outer pipe 202, and generally, the heat exchange working medium 203 is a liquid medium such as water which is easy to evaporate and has a relatively large heat capacity. The height of the heat exchange working medium 203 is lower than the bottom surface of the inner tube 201, that is, the bottom surface of the inner tube 201 is not in contact with the liquid level of the heat exchange working medium 203. One end of the inner pipe 201 is connected with a water inlet pipe 205, and the other end of the inner pipe 201 is connected with a water outlet pipe 206, so that cold water is continuously input and hot water is discharged.

When the device works, high-temperature smoke transversely erodes the radial heat pipe 2 to exchange heat to form low-temperature smoke, the liquid heat exchange working medium 203 at the bottom of the outer pipe 202 is heated and vaporized by the high-temperature smoke and then carries a large amount of heat energy to rise to the upper part of the inner cavity of the outer pipe 202, the temperature of the vaporized heat exchange working medium 203 is reduced and the vaporized heat exchange working medium is condensed again through heat exchange with cooling water reaching the inner pipe 201, and the condensed heat exchange working medium 203 flows back to the bottom of the outer pipe 202 under the action of self gravity. The above process is repeated and circulated continuously, so that the radial heat pipe 2 works continuously and heat energy is transferred continuously. On the one hand, the radial heat pipe 2 can transfer heat energy with high efficiency because it utilizes two processes of absorption and release of phase-change heat transfer in the heat transfer science. On the other hand, because the flue gas and the cooling water in the inner pipe 201 are separated from the outer pipe 202 before, when the outer pipe 202 is broken and leaked due to scouring, only the heat exchange working medium 203 in the outer pipe 202 is leaked into the flue gas, and because the amount is small, the heat exchange working medium is volatilized quickly, and the flue gas is not influenced too much. The inner pipe 201 is not easily washed by smoke due to the protection of the outer pipe 202, so that the effects of abrasion resistance and leakage prevention are achieved.

With reference to fig. 1, in another embodiment, a plurality of groups of the radial heat pipes 2 are distributed along the height direction of the rack body 1, and in the plurality of groups of the radial heat pipes 2, an outlet of an inner pipe 201 of a previous layer of the radial heat pipes 2 is communicated with an inlet of an inner pipe 201 of a next layer of the radial heat pipes 2, and an outlet of the inner pipe 201 of the next layer of the radial heat pipes 2 is communicated with an inlet of an inner pipe 201 of a next layer of the radial heat pipes 2, so that the radial heat pipes 2 are communicated to form a serpentine structure. It should be noted that the communicating pipe 4 for communicating the inlet and the outlet is generally located outside the shell 5 of the economizer, so as to avoid the flue gas from washing the communicating part. And both ends of the inner pipe 201 are fixed to the wall surface of the housing 5.

With continued reference to fig. 1, in another embodiment, the outer wall of the outer tube 202 has fins 3, and the fins 3 are fixed on both the top surface and the lower surface of the outer wall of the outer tube 202, so as to increase the heat exchange area with the passing flue gas and increase the heat exchange efficiency.

With continued reference to FIG. 1, in a preferred embodiment, the fins 3 are distributed along the length of the outer tube 202 and are vertically disposed so as to be less prone to ash accumulation.

In another embodiment, the accommodating cavity 204 between the inner tube 201 and the outer tube 202 is in a vacuum state, and the vacuum degree is 1.2 × 10 ^-3 ～1.5×10 ^-4 Pa is optional.

Finally, it should be understood that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims

1. A radial heat pipe type low-temperature economizer, characterized in that the economizer comprises: the heat pipe comprises a frame body and a radial heat pipe horizontally fixed on the frame body; the radial heat pipe includes: the heat exchanger comprises an inner pipe, an outer pipe and a heat exchange working medium; wherein: the outer pipe is sleeved on the inner pipe, two ends of the inner pipe respectively penetrate through two ends of the outer pipe, and the end part of the outer pipe is hermetically connected with the outer wall of the inner pipe; the heat exchange working medium is positioned at the bottom of the accommodating cavity between the inner pipe and the outer pipe.

2. The radial heat pipe type low-temperature economizer of claim 1, wherein a plurality of groups of the radial heat pipes are distributed along the height direction of the frame body.

3. The radial heat pipe type low-temperature economizer of claim 2, wherein the outlets of the radial heat pipes in the previous layer are connected with the inlets of the radial heat pipes in the next layer, and the outlets of the radial heat pipes in the next layer are connected with the inlets of the radial heat pipes in the next layer, so that the radial heat pipes are communicated to form a coil-shaped structure.

4. The radial heat pipe type low temperature economizer of claim 1, wherein the outer pipe has fins on an outer wall thereof.

5. The radial heat pipe type low temperature economizer of claim 4, wherein the fins are distributed along the length direction of the outer pipe and are vertically arranged.

6. The radial heat pipe type low temperature economizer of claim 5, wherein the fins are fixed to both the top surface and the lower surface of the outer wall of the outer pipe.

7. A radial heat pipe type cryogenic economizer according to any one of claims 1 to 6, wherein the accommodating chamber between the inner pipe and the outer pipe is in a vacuum state.

8. The radial heat pipe type low-temperature economizer of claim 7, wherein the degree of vacuum in the accommodating chamber is 1.2 x 10 ^-3 ～1.5×10 ^-4 Pa。

9. The radial heat pipe type cryogenic economizer of any one of claims 1 to 6, wherein the height of the heat exchange medium is lower than the bottom surface of the inner pipe.