Energy-saving and environment-friendly supercritical CO2 flue gas heat exchanger

Abstract

The utility model discloses an energy-saving environment-friendly supercritical CO2 flue gas heat exchanger which comprises a shell, a heat preservation pipe is arranged on the inner side of the shell, a reinforcing plate is fixedly connected between the outer side of the heat preservation pipe and the inner side of the shell, a heat preservation filling layer is filled between the heat preservation pipe and the shell, and a heat exchange pipe is arranged on the inner side of the heat preservation pipe. A spiral heat conduction plate is fixedly connected between the outer side of the heat exchange pipe and the heat preservation pipe, a plurality of funnels are fixedly connected into the heat preservation pipe, and end covers are fixedly connected to the two sides of the shell. The heat preservation performance can be improved and heat loss can be reduced through the shell, the heat preservation pipe and the heat preservation filling layer, the flowing time of smoke can be shortened through the spiral heat conduction plate, the contact area between the spiral heat conduction plate and the heat exchange pipe can be increased, and the flowing speed of carbon dioxide can be reduced through the reducer pipe and the funnel. And therefore, the retention time of the heat exchange tube can be prolonged, and the heat exchange efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to an energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger. Background Technology

[0002] With the global energy crisis becoming increasingly prominent, energy-saving and emission-reduction technologies for internal combustion engines are attracting growing attention, and waste heat recovery from internal combustion engines holds immense energy-saving potential. Transcritical power cycles using CO2 as the working fluid have been chosen for waste heat recovery power generation due to their superior miniaturization, wide applicability, and safety and environmental friendliness. The CO2 flue gas heat exchanger is a crucial component of this cycle, where the CO2 working fluid absorbs the high-temperature exhaust heat from the internal combustion engine. Therefore, the performance of the CO2 flue gas heat exchanger directly determines the effectiveness of waste heat recovery. Unlike typical organic Rankine cycle flue gas heat exchangers, for internal combustion engines operating under multiple conditions, the energy and temperature of the exhaust gas vary with the operating conditions. When the flue gas volume is high, a sufficient heat exchange area is needed to ensure the heat exchange process is realized, while when the flue gas volume is low, fewer heat exchange channels are needed to maintain a higher heat transfer coefficient.

[0003] Existing CO2 flue gas heat exchangers suffer from insufficient heat exchange performance due to excessively high flue gas and CO2 flow rates and small contact areas. To overcome these disadvantages, this invention provides an energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger, comprising a shell, an insulation pipe disposed on the inner side of the shell, a reinforcing plate fixedly connected between the outer side of the insulation pipe and the inner side of the shell, an insulation filling layer filling the space between the insulation pipe and the shell, a heat exchange pipe disposed on the inner side of the insulation pipe, a spiral heat-conducting plate fixedly connected between the outer side of the heat exchange pipe and the insulation pipe, a plurality of funnels fixedly connected inside the insulation pipe, and end caps fixedly connected to both sides of the shell.

[0006] Furthermore, each end cap is provided with a through hole, a first exhaust pipe is fixedly connected to the through hole on one side, and a first intake pipe is fixedly connected to the through hole on the other side.

[0007] Furthermore, a first connecting flange is fixedly connected to one end of the first exhaust pipe, and a second connecting flange is fixedly connected to one end of the first intake pipe.

[0008] Furthermore, one end of the heat exchange tube is fixedly connected to a first reducing pipe through an end cap, and one end of the first reducing pipe is fixedly connected to a third connecting flange.

[0009] Furthermore, a second reducing pipe is fixedly connected to the other end of the heat exchange tube through the end cap, and a fourth connecting flange is fixedly connected to one end of the second reducing pipe.

[0010] Furthermore, a first connecting pipe is provided at one end of the first intake pipe, and a fifth connecting flange is fixedly connected to both ends of the first connecting pipe. The fifth connecting flange located on one side is bolted to the second connecting flange.

[0011] Furthermore, a second connecting pipe is provided at one end of the second reducing pipe, and a sixth connecting flange is fixedly connected to both ends of the second connecting pipe. The sixth connecting flange located on one side is bolted to the fourth connecting flange.

[0012] The beneficial effects of this utility model are:

[0013] In use, this energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger improves insulation performance and reduces heat loss through its outer shell, insulation pipe, and insulation filling layer. The spiral heat-conducting plate slows down the flow time of the flue gas and increases the contact area with the heat exchange pipe. The variable diameter pipe and funnel slow down the flow rate of carbon dioxide, thereby increasing its residence time in the heat exchange pipe and improving heat exchange efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 : Front view of this utility model;

[0016] Figure 2 : A cross-sectional view of this utility model;

[0017] Figure 3 : Schematic diagram of the installation structure of the reinforcing plate of this utility model.

[0018] The attached figures are labeled as follows:

[0019] 1. Outer shell; 2. End cap; 3. First exhaust pipe; 4. First connecting flange; 5. First air inlet pipe; 6. Second connecting flange; 7. First reducing pipe; 8. Third connecting flange; 9. Second reducing pipe; 10. Fourth connecting flange; 11. First connecting pipe; 12. Fifth connecting flange; 13. Second connecting pipe; 14. Sixth connecting flange; 15. Insulation pipe; 16. Insulation filling layer; 17. Heat exchanger pipe; 18. Funnel; 19. Spiral heat conduction plate; 20. Through hole; 21. Reinforcing plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] like Figure 1-3 As shown, an energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger is disclosed, comprising an outer shell 1, an insulation pipe 15 disposed on the inner side of the outer shell 1, a reinforcing plate 21 fixedly connected between the outer side of the insulation pipe 15 and the inner side of the outer shell 1, and an insulation filling layer 16 filling the space between the insulation pipe 15 and the outer shell 1. The outer shell 1, insulation pipe 15 and insulation filling layer 16 can improve the insulation performance and reduce heat loss. A heat exchange pipe 17 disposed on the inner side of the insulation pipe 15, and a spiral heat-conducting plate 19 fixedly connected between the outer side of the heat exchange pipe 17 and the insulation pipe 15. The spiral heat-conducting plate 19 can slow down the flow time of the flue gas and increase the contact area between the flue gas and the heat exchange pipe 17. Several funnels 18 are fixedly connected inside the insulation pipe 15, and end caps 2 are fixedly connected to both sides of the outer shell 1.

[0022] As shown in the figure, each end cap 2 has a through hole 20. A first exhaust pipe 3 is fixedly connected to one through hole 20, and a first intake pipe 5 is fixedly connected to the other through hole 20. A first connecting flange 4 is fixedly connected to one end of the first exhaust pipe 3, and a second connecting flange 6 is fixedly connected to one end of the first intake pipe 5. A first reducing pipe 7 is fixedly connected to one end of the heat exchange tube 17 through the end cap 2. A third connecting flange 8 is fixedly connected to one end of the first reducing pipe 7. A second reducing pipe 9 is fixedly connected to the other end of the heat exchange tube 17 through the end cap 2. A fourth connecting flange 10 is fixedly connected to one end of the second reducing pipe 9. The reducing pipe and funnel 18 can slow down the flow rate of carbon dioxide, thereby increasing its residence time in the heat exchange tube 17. Carbon dioxide enters the heat exchange tube 17 through the first reducing pipe 7, and then passes through multiple funnels 18 in sequence before being discharged through the second reducing pipe 9 and the second connecting pipe 13.

[0023] As shown in the figure, a first connecting pipe 11 is provided at one end of the first intake pipe 5. A fifth connecting flange 12 is fixedly connected to both ends of the first connecting pipe 11. The fifth connecting flange 12 located on one side is bolted to the second connecting flange 6. A second connecting pipe 13 is provided at one end of the second reducing pipe 9. A sixth connecting flange 14 is fixedly connected to both ends of the second connecting pipe 13. The sixth connecting flange 14 located on one side is bolted to the fourth connecting flange 10.

[0024] Working principle: During use, carbon dioxide enters the heat exchange tube 17 through the first reducing pipe 7, and then passes through multiple funnels 18 before being discharged through the second reducing pipe 9 and the second connecting pipe 13. The flue gas enters the gap between the insulation pipe 15 and the heat exchange tube 17 through the first connecting pipe 11 and the first inlet pipe 5, and is then discharged through the first exhaust pipe 3. The flue gas and carbon dioxide can exchange heat through the spiral heat-conducting plate 19 and the heat exchange tube 17. The outer shell 1, insulation pipe 15 and insulation filling layer 16 can improve the insulation performance and reduce heat loss. The spiral heat-conducting plate 19 can slow down the flow time of the flue gas and increase the contact area with the heat exchange tube 17. The reducing pipe and funnels 18 can slow down the flow rate of carbon dioxide, thereby increasing its residence time in the heat exchange tube 17 and improving the heat exchange efficiency.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger, comprising a shell (1), characterized in that: The inner side of the outer shell (1) is provided with a heat insulation pipe (15), and a reinforcing plate (21) is fixedly connected between the outer side of the heat insulation pipe (15) and the inner side of the outer shell (1). A heat insulation filling layer (16) is filled between the heat insulation pipe (15) and the outer shell (1). A heat exchange pipe (17) is provided inside the heat insulation pipe (15), and a spiral heat-conducting plate (19) is fixedly connected between the outer side of the heat exchange pipe (17) and the heat insulation pipe (15). Several funnels (18) are fixedly connected inside the heat insulation pipe (15). End caps (2) are fixedly connected to both sides of the outer shell (1).

2. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 1, characterized in that: Each end cap (2) has a through hole (20). A first exhaust pipe (3) is fixedly connected to the through hole (20) on one side, and a first air intake pipe (5) is fixedly connected to the through hole (20) on the other side.

3. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 2, characterized in that: The first exhaust pipe (3) is fixedly connected to a first connecting flange (4) at one end, and the first intake pipe (5) is fixedly connected to a second connecting flange (6) at one end.

4. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 3, characterized in that: One end of the heat exchange tube (17) is fixedly connected to the end cap (2) and a first reducing pipe (7). One end of the first reducing pipe (7) is fixedly connected to a third connecting flange (8).

5. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 4, characterized in that: The other end of the heat exchange tube (17) is fixedly connected to the end cap (2) and a second reducing pipe (9). One end of the second reducing pipe (9) is fixedly connected to a fourth connecting flange (10).

6. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 5, characterized in that: The first intake pipe (5) is provided with a first connecting pipe (11) at one end. Both ends of the first connecting pipe (11) are fixedly connected with a fifth connecting flange (12). The fifth connecting flange (12) located on one side is bolted to the second connecting flange (6).

7. The energy-saving and environmentally friendly supercritical CO2 flue gas heat exchanger according to claim 6, characterized in that: The second reducing pipe (9) is provided with a second connecting pipe (13) at one end. Both ends of the second connecting pipe (13) are fixedly connected with a sixth connecting flange (14). The sixth connecting flange (14) located on one side is bolted to the fourth connecting flange (10).

Images