CN210135599U

CN210135599U - Double-tube-pass composite efficient heat exchanger

Info

Publication number: CN210135599U
Application number: CN201921061872.3U
Authority: CN
Inventors: 韩磊; 史月涛; 张良
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2020-03-10
Anticipated expiration: 2029-07-08

Abstract

An object of the utility model is to provide a compound high-efficient heat exchanger of double-barrelled journey for solve and improve heat exchange tube heat exchange efficiency, with the technical problem who improves air preheater tube wall temperature, with the technical effect that low temperature section that reaches air heat exchanger is higher than the flue gas dew point. A double-tube-pass composite efficient heat exchanger comprises an inner tube and an outer tube, wherein the inner tube is used for passing through a heated medium, the outer tube is used for absorbing external heat, and the inner tube is sleeved in the outer tube; a heat exchange liquid is arranged between the inner pipe and the outer pipe, and a liquid absorption core is also arranged in the outer pipe; the two ends of the outer pipe and the inner pipe are connected through a sealing assembly.

Description

Double-tube-pass composite efficient heat exchanger

Technical Field

The utility model belongs to the technical field of the heat exchanger technique and specifically relates to a compound high-efficient heat exchanger of double-barrelled journey.

Background

In the prior art, flue gas waste heat is recovered through a flue gas waste heat recovery device to heat furnace inlet air. However, most of the boiler air preheaters adopt tubular preheaters, and the flue gas dew point temperature rises and the air inlet temperature is uncontrollable after the denitration device is installed on the boiler, so that the temperature of the pipe wall of the low-temperature section of the air preheater is lower than the dew point, the problems of condensation, dust deposition and corrosion are caused, the heat exchange performance of the air preheater is influenced, and the service life of the air preheater is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a compound high-efficient heat exchanger of double-barrelled journey for solve and improve heat exchange tube heat exchange efficiency, with the technical problem who improves air preheater tube wall temperature, with the technical effect that low temperature section that reaches air heat exchanger is higher than the flue gas dew point.

The utility model provides a technical scheme that its technical problem adopted is:

a double-tube-pass composite efficient heat exchanger comprises an inner tube and an outer tube, wherein the inner tube is used for passing through a heated medium, the outer tube is used for absorbing external heat, and the inner tube is sleeved in the outer tube; a heat exchange liquid is arranged between the inner pipe and the outer pipe, and a liquid absorption core is also arranged in the outer pipe; the two ends of the outer pipe and the inner pipe are connected through a sealing assembly.

Further, the inner pipe is arranged in the outer pipe in a rotary reciprocating mode.

Further, the outer pipe is sleeved in the boiler flue gas pipe.

Furthermore, a maintenance window is arranged on the boiler flue gas pipe.

Furthermore, the maintenance window adopts annular maintenance window, and the maintenance window is formed by two semicylinder cavities in a combined mode.

Furthermore, heat exchange fins are arranged outside the outer pipe.

Furthermore, an inserting plate is arranged outside the outer pipe, the heat exchange fins are inserted into the inserting plate through inserting grooves, and the inserting plate is in interference fit with the inserting grooves.

Furthermore, the sealing assembly comprises a rubber sealing ring and an axial end plate, the rubber sealing ring is of a round platform cavity structure, a large-diameter port of the rubber sealing ring is arranged in the round platform cavity structure, and the axial end plate is arranged at the outer end of the rubber sealing ring.

Furthermore, a sealing groove matched with the axial end plate is arranged on the outer peripheral surface of the rubber sealing ring.

The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and the above technical solutions have the following advantages or beneficial effects:

according to the technology, the outer pipe wall is heated through the flue gas, the outer pipe transfers heat to the inner pipe side through the hot steam, and then the furnace inlet air is heated through the inner pipe wall. The effective isolation of the flue gas and the inner pipe of the air preheater is realized, and the temperature of the furnace air is obviously improved, so that the low-temperature section of the air heat exchanger operates above the dew point of the flue gas, an acid dew point corrosion area is avoided, and the reliability of equipment is ensured. The technology solves the problem that the air preheater causes air leakage due to corrosive wear and affects the operation of the boiler.

Drawings

Fig. 1 is an overall sectional view of an embodiment of the present invention;

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

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

FIG. 4 is a schematic sectional view of a rubber seal ring according to an embodiment of the present invention;

in the figure: 1. an outer tube; 2. an inner tube; 3. a boiler exhaust pipe; 4. heat exchange fins; 5. inserting plates; 6. a slot; 7. repairing the window; 8. a rubber seal ring; 9. an axial end plate; 10. a sealing groove; 11. a wick.

Detailed Description

In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and techniques are omitted so as to not unnecessarily limit the invention.

As shown in fig. 1 to 4, the double-tube-pass composite high-efficiency heat exchanger comprises an outer tube 1 and an inner tube 2, wherein the inner tube 2 passes through the outer tube 1. The inner pipe 2 is used for being added with furnace air, and the outer pipe 1 is used for absorbing the residual heat in the boiler flue gas.

The outer pipe 1 is sleeved in a boiler exhaust pipe 3, heat exchange fins 4 are arranged on the outer side of the outer pipe 1, and the heat exchange fins 4 are of a bent arc-shaped structure so as to increase the specific surface area for heat exchange with flue gas. The outer side wall of the outer tube 1 is provided with an inserting plate 5, the inner end of the heat exchange fin 4 is provided with the inserting plate 5, and the inserting groove 6 is in interference fit with the inserting plate 5. The boiler exhaust pipe 3 is also provided with an annular maintenance window 7, the maintenance window 7 is formed by combining two semi-cylindrical cavities, the maintenance window 7 can be opened at intervals to take down the heat exchange fins 4, and the heat exchange fins 4 are cleaned to prevent dust from attaching to influence the heat exchange efficiency. The inner pipe 2 is arranged in the inner cavity of the outer pipe 1 in a rotary reciprocating mode, and two ends of the inner pipe 2 are connected with the outer pipe 1 in a sealing mode through sealing assemblies. The sealing assembly comprises a rubber sealing ring 8 and an axial end plate 9, the rubber sealing ring 8 adopts a round platform cavity structure, and a large-diameter port of the rubber sealing ring 8 is arranged in the inner side. The rubber seal ring 8 of the structure can realize interference fit between the inner pipe 2 and the outer pipe 1, and can play a good sealing effect along with expansion with heat and contraction with cold. The axial end plate 9 is arranged at the outer end of the rubber sealing ring 8 and plays a role in installing and fixing the rubber sealing ring 8; and a sealing groove 10 matched with the axial end plate 9 is arranged on the outer peripheral surface of the rubber sealing ring 8. The lower extreme in the outer tube 1 is equipped with imbibition core 11, and the heat exchange liquid between outer tube 1 and inner tube 2 adsorbs in imbibition core 11. After the outer pipe 1 absorbs heat, the liquid in the liquid absorption core 11 is heated and evaporated, and the evaporated gas is condensed again and falls into the liquid absorption core 11 below after meeting the inner pipe 2 with lower temperature, and the operation is repeated.

In addition to the technical features described in the specification, the technology is known to those skilled in the art.

Although the specific embodiments of the present invention have been described with reference to the drawings, the present invention is not limited thereto, and various modifications or variations that can be made by those skilled in the art without inventive labor are still within the scope of the present invention.

Claims

1. A double-tube-pass composite efficient heat exchanger is characterized by comprising an inner tube and an outer tube, wherein the inner tube is used for passing through a heated medium, the outer tube is used for absorbing external heat, and the inner tube is sleeved in the outer tube; a heat exchange liquid is arranged between the inner pipe and the outer pipe, and a liquid absorption core is also arranged in the outer pipe; the two ends of the outer pipe and the inner pipe are connected through a sealing assembly.

2. The double-tube-pass composite high-efficiency heat exchanger as claimed in claim 1, wherein the inner tube is rotatably and reciprocally disposed in the outer tube.

3. The double-tube-pass composite efficient heat exchanger of claim 1, wherein the outer tube is sleeved in a boiler flue gas tube.

4. The double-tube-pass composite efficient heat exchanger as claimed in claim 3, wherein the boiler flue gas tube is provided with a maintenance window.

5. The double-tube-pass composite efficient heat exchanger as claimed in claim 4, wherein the maintenance window is an annular maintenance window, and the maintenance window is formed by combining two semi-cylindrical cavities.

6. The double-tube-pass composite efficient heat exchanger of claim 4, wherein heat exchange fins are arranged outside the outer tube.

7. The double-tube-pass composite efficient heat exchanger as recited in claim 6, wherein an inserting plate is arranged outside the outer tube, the heat exchange fins are inserted into the inserting plate through inserting slots, and the inserting plate is in interference fit with the inserting slots.

8. The compound high-efficiency heat exchanger of a double-tube pass according to claim 1, characterized in that the sealing component comprises a rubber sealing ring and an axial end plate, the rubber sealing ring adopts a round cavity structure, a large-diameter port of the rubber sealing ring is arranged inwards, and the axial end plate is arranged at the outer end of the rubber sealing ring.

9. The compound high-efficiency heat exchanger of claim 8, characterized in that the outer circumference of the rubber sealing ring is provided with a sealing groove matching with the axial end plate.