Flue gas waste heat recovery device

Abstract

The utility model relates to a flue gas waste heat recovery device. The flue gas waste heat recovery device comprises a heat exchange assembly, a water circulation assembly and a flue gas assembly. And the water circulation assembly is communicated with the heat exchange assembly. The flue gas assembly comprises a flue gas pipeline structure, the flue gas pipeline structure comprises a first flue gas pipeline and a second flue gas pipeline, the first flue gas pipeline and the second flue gas pipeline are arranged in parallel, the first flue gas pipeline is communicated with the second flue gas pipeline, and the second flue gas pipeline is communicated with the heat exchange assembly. According to the technical scheme, the problem that in the prior art, the adjustment accuracy of the smoke amount is low is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas waste heat recovery, and in particular, to a flue gas waste heat recovery device. Background Art

[0002] When a glass kiln is producing glass, the flue gas generated is at a high temperature. It is discharged after desulfurization and denitrification. At this time, the heat of the flue gas cannot be fully utilized.

[0003] In the prior art (for example, the authorization announcement number is CN214250694U, and the name is: a device for heating water in a heat network using exhaust gas from a waste heat boiler), one end of the first flue gas duct is connected to the flue of the waste heat boiler, and the other end is connected to the air inlet end of the heat exchanger, one end of the second flue gas duct is connected to the air outlet end of the heat exchanger, and the other end is connected to the flue of the waste heat boiler, and the flue gas enters the heat exchanger through the first flue gas duct and is discharged from the second flue gas duct after heat exchange. This device can recycle the waste heat of the flue gas, but the adjustment accuracy of this device is low when it only relies on the damper to adjust the flue gas volume, and when the inlet damper and / or outlet damper fails, it needs to be shut down for processing. Utility Model Content

[0004] The present application provides a flue gas waste heat recovery device to solve the problem of low accuracy in regulating the flue gas volume in the prior art.

[0005] According to the present application, a flue gas waste heat recovery device includes: a heat exchange component, a water circulation component and a flue gas component. The water circulation component is connected to the heat exchange component. The flue gas component includes a flue gas pipeline structure, the flue gas pipeline structure includes a first flue gas pipeline and a second flue gas pipeline, the first flue gas pipeline and the second flue gas pipeline are arranged in parallel, the first flue gas pipeline is connected to the second flue gas pipeline, and the second flue gas pipeline is connected to the heat exchange component.

[0006] In some embodiments, the smoke assembly also includes a regulating structure, which includes a smoke inlet valve, a smoke outlet valve and a smoke exhaust valve. The smoke inlet valve and the smoke outlet valve are both arranged on the second smoke duct, and the smoke inlet valve and the smoke outlet valve are respectively located on both sides of the heat exchange assembly. The smoke exhaust valve is arranged on the first smoke duct, and the smoke exhaust valve is located between the smoke inlet and the smoke outlet of the second smoke duct.

[0007] In some embodiments, the smoke duct structure also includes a first induced draft fan, a second induced draft fan and a third smoke duct, the first induced draft fan is arranged on the first smoke duct, the second induced draft fan is arranged on the third smoke duct, the third smoke duct and the first smoke duct are arranged in parallel, and the third smoke duct and the first smoke duct are connected.

[0008] In some embodiments, the regulating structure also includes a first regulating valve, a second regulating valve, a third regulating valve and a fourth regulating valve, the first regulating valve and the second regulating valve are both arranged on the first flue gas duct, the first regulating valve and the second regulating valve are located on both sides of the first induced draft fan, the third regulating valve and the fourth regulating valve are both arranged on the third flue gas duct, and the third regulating valve and the fourth regulating valve are located on both sides of the second induced draft fan.

[0009] In some embodiments, the water circulation component includes a water circulation structure, a water replenishment structure and a pressure relief structure, the water circulation structure includes a water circulation main circuit, the water replenishment structure includes a first water replenishment pipeline, the pressure relief structure includes a pressure relief pipeline, the water circulation main circuit is connected to the heat exchange component, the first water replenishment pipeline is connected to the water circulation main circuit, and the pressure relief pipeline is connected to the water circulation main circuit.

[0010] In some embodiments, the water circulation structure further includes a first circulation pump, which is disposed on the main water circulation circuit.

[0011] In some embodiments, the water replenishment structure also includes a first water replenishment pump, a water replenishment tank and a water replenishment valve. The first water replenishment pump, the water replenishment tank and the water replenishment valve are all arranged on the first water replenishment pipeline, and the water replenishment valve is arranged close to the water inlet end of the water replenishment tank.

[0012] In some embodiments, the pressure relief structure further includes a pressure relief valve, which is disposed on the pressure relief pipeline.

[0013] In some embodiments, the heat exchange assembly includes a heat exchanger, a purge pipeline, and a purge valve. The heat exchanger is disposed on the purge pipeline, and the purge valve is disposed on the purge pipeline.

[0014] In some embodiments, the device further includes a detection component, the detection component includes a smoke detection structure and a softened water detection structure, the smoke detection structure is arranged on the first smoke duct, and the softened water detection structure is arranged on the water circulation component.

[0015] By applying the technical solution of the present application, the first smoke duct and the second smoke duct are arranged in parallel, and the first smoke duct and the second smoke duct are connected. By adjusting the amount of smoke introduced into the first smoke duct, the amount of smoke introduced into the second smoke duct can be adjusted, which effectively improves the accuracy of adjusting the amount of smoke in the second smoke duct. The second smoke duct is connected to the heat exchange component, and the water circulation component is connected to the heat exchange component. The heat of the smoke in the second smoke duct is transferred to the water circulation component through the heat exchange component, thereby realizing the recovery and utilization of the waste heat of the smoke. The technical solution of the present application effectively solves the problem of low accuracy in adjusting the amount of smoke in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram showing the structure of a flue gas waste heat recovery device according to an embodiment of the present application is shown;

[0019] Figure 2 A schematic diagram showing the structure of a smoke assembly according to an embodiment of the present application is shown;

[0020] Figure 3 A schematic diagram showing the structure of a water circulation component according to an embodiment of the present application is shown;

[0021] Figure 4 A schematic diagram of the structure of a cyclone filter according to an embodiment of the present application is shown;

[0022] Figure 5 A schematic diagram of the internal structure of a cyclone filter according to an embodiment of the present application is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Heat exchange component; 11. Heat exchanger; 12. Purge pipeline; 13. Purge valve; 20. Water circulation component; 21. Water circulation structure; 211. Water circulation main road; 212. First circulation pump; 22. Water replenishment structure; 221. First water replenishment pipeline; 222. First water replenishment pump; 223. Water replenishment tank; 224. Water replenishment valve; 23. Pressure relief structure; 231. Pressure relief pipeline; 232. Pressure relief valve; 30. Flue gas component; 31. Flue gas pipeline structure; 311. First flue gas duct; 312, second flue gas duct; 313, first induced draft fan; 314, second induced draft fan; 315, third flue gas duct; 32, regulating structure; 321, smoke inlet valve; 322, smoke outlet valve; 323, smoke exhaust valve; 33, cyclone filter; 331, filter housing; 332, filter cartridge; 333, filter plate; 3331, filter hole; 34, support frame; 40, detection component; 41, flue gas detection structure; 42, softened water detection structure. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0028] like Figure 1 and Figure 2 As shown, the embodiment relates to a flue gas waste heat recovery device, comprising: a heat exchange component 10, a water circulation component 20 and a flue gas component 30. The water circulation component 20 is connected to the heat exchange component 10. The flue gas component 30 includes a flue gas pipe structure 31, and the flue gas pipe structure 31 includes a first flue gas pipe 311 and a second flue gas pipe 312. The first flue gas pipe 311 and the second flue gas pipe 312 are arranged in parallel, and the first flue gas pipe 311 is connected to the second flue gas pipe 312, and the second flue gas pipe 312 is connected to the heat exchange component 10.

[0029] By applying the technical solution of this embodiment, the first flue gas duct 311 and the second flue gas duct 312 are arranged in parallel, and the first flue gas duct 311 and the second flue gas duct 312 are connected. By adjusting the amount of flue gas introduced into the first flue gas duct 311, the amount of flue gas introduced into the second flue gas duct 312 can be adjusted, which effectively improves the accuracy of adjusting the amount of flue gas in the second flue gas duct 312. The second flue gas duct 312 is connected to the heat exchange component 10, and the water circulation component 20 is connected to the heat exchange component 10. The heat of the flue gas in the second flue gas duct 312 is transferred to the water circulation component 20 through the heat exchange component 10, thereby realizing the recovery and utilization of the waste heat of the flue gas. The technical solution of this embodiment effectively solves the problem of low accuracy in adjusting the amount of flue gas in the prior art. It should be noted that the first smoke duct 311 and the second smoke duct 312 are arranged in parallel, that is, the second smoke duct 312 is bridged over the first smoke duct 311 , and the smoke inlet and the smoke outlet of the second smoke duct 312 are located on both sides of the smoke exhaust valve 323 .

[0030] like Figure 1 and Figure 2 As shown, in some embodiments, the smoke assembly 30 also includes a regulating structure 32, and the regulating structure 32 includes a smoke inlet valve 321, a smoke outlet valve 322 and a smoke exhaust valve 323. The smoke inlet valve 321 and the smoke outlet valve 322 are both arranged on the second smoke duct 312, and the smoke inlet valve 321 and the smoke outlet valve 322 are respectively located on both sides of the heat exchange assembly 10. The smoke inlet valve 321 can control the amount of smoke entering the heat exchange assembly 10 through the second smoke duct 312, and the smoke outlet valve 322 can control the amount of smoke flowing from the heat exchange assembly 10 to the second smoke duct 312. The smoke exhaust valve 323 is arranged on the first smoke duct 311, and the smoke exhaust valve 323 can control the amount of smoke in the first smoke duct 311. The smoke exhaust valve 323 is located between the smoke inlet and the smoke outlet of the second smoke duct 312, and the smoke amount in the second smoke duct 312 can be adjusted by controlling the opening of the smoke exhaust valve 323. By adjusting the amount of smoke passing through the first smoke duct 311, the amount of smoke in the second smoke duct 312 can be adjusted. By adjusting the opening of the smoke inlet valve 321 and the smoke outlet valve 322, the amount of smoke in the second smoke duct 312 can be adjusted. The two adjustment methods work together to achieve precise adjustment of the amount of smoke in the second smoke duct 312. At the same time, even if the smoke inlet valve 321 and the smoke outlet valve 322 fail and the opening cannot be adjusted, there is no need to shut down for processing, and the opening of the smoke exhaust valve 323 can be adjusted.

[0031] like Figure 4 and Figure 5As shown, it should be noted that the smoke assembly 30 also includes a cyclone filter 33 and a support frame 34. The cyclone filter 33 and the heat exchanger 11 are located on both sides of the smoke inlet valve 321. The cyclone filter 33 includes a filter housing 331, a filter cartridge 332 and a filter plate 333. The support frame 34 is connected to the filter housing 331. The filter housing 331 has a accommodating space inside. The filter cartridge 332 is located inside the filter housing 331. The filter plate 333 is connected to the inner wall of the filter cartridge 332. The filter plate 333 is spirally arranged radially along the filter cartridge 332. The filter plate 333 has a plurality of filter holes 3331. The cyclone filter 33 also includes a smoke inlet pipe and a smoke outlet pipe. The smoke inlet pipe is located below the cyclone filter 33, and the smoke outlet pipe is located above the cyclone filter 33. The second smoke pipe 312 is respectively connected to the first end of the smoke inlet pipe and the first end of the smoke outlet pipe, and the second end of the smoke inlet pipe and the second end of the smoke outlet pipe are both connected to the filter cartridge 332. The smoke in the second smoke duct 312 first passes through the cyclone filter 33 and then flows into the heat exchanger 11. The smoke flows from the smoke inlet duct to the filter cartridge 332. After being filtered by the filter plate 333, the smoke flows into the smoke outlet duct and then flows into the second smoke duct 312. The spiral arrangement of the filter plate 333 can fully filter the smoke to prevent adverse effects on the heat exchange effect of the heat exchanger 11. There is a spacing distance between the filter housing 331 and the filter cartridge 332. Insulation measures are taken between the filter housing 331 and the filter cartridge 332 to prevent excessive heat loss during the filtration process of the smoke, which affects the subsequent heat exchange effect.

[0032] like Figure 2 As shown, in some embodiments, the smoke duct structure 31 further includes a first induced draft fan 313, a second induced draft fan 314 and a third smoke duct 315. The first induced draft fan 313 is arranged on the first smoke duct 311, the second induced draft fan 314 is arranged on the third smoke duct 315, the third smoke duct 315 and the first smoke duct 311 are arranged in parallel, and the third smoke duct 315 and the first smoke duct 311 are connected. The smoke duct structure 31 further includes a chimney, the first smoke duct 311 is connected to the chimney, and the first induced draft fan 313 is used to guide the smoke in the first smoke duct 311 to the chimney for discharge. The third smoke duct 315 is connected across the first smoke duct 311, and the second induced draft fan 314 is used as a standby induced draft fan, which is used when the wind force is insufficient or the first induced draft fan 313 fails.

[0033] like Figure 2As shown, in some embodiments, the regulating structure 32 also includes a first regulating valve, a second regulating valve, a third regulating valve and a fourth regulating valve. The first regulating valve and the second regulating valve are both arranged on the first flue gas duct 311, and the first regulating valve and the second regulating valve are located on both sides of the first induced draft fan 313. The first regulating valve and the second regulating valve are used to adjust the stability of the gas before and after the first induced draft fan 313. The third regulating valve and the fourth regulating valve are both arranged on the third flue gas duct 315. The third regulating valve and the fourth regulating valve are located on both sides of the second induced draft fan 314. The third regulating valve and the fourth regulating valve are used to adjust the stability of the gas before and after the second induced draft fan 314.

[0034] like Figure 3 As shown, in some embodiments, the water circulation component 20 includes a water circulation structure 21, a water replenishment structure 22 and a pressure relief structure 23. The water circulation structure 21 includes a water circulation main path 211. The water replenishment structure 22 includes a first water replenishment pipeline 221. The pressure relief structure 23 includes a pressure relief pipeline 231. The water circulation main path 211 is connected to the heat exchange component 10. The heat exchange component 10 transfers the heat of the flue gas to the softened water in the water circulation main path 211. The water circulation main path 211 is connected to the heat network. The first water replenishment pipeline 221 is connected to the water circulation main path 211 and can replenish the water circulation main path 211 with softened water. The pressure relief pipeline 231 is connected to the water circulation main path 211 and can adjust the pressure of the softened water in the water circulation main path 211.

[0035] like Figure 3 As shown, in some embodiments, the water circulation structure 21 also includes a first circulation pump 212, and the first circulation pump 212 is arranged on the water circulation main road 211. The first circulation pump 212 provides kinetic energy for realizing water circulation. It should be noted that the water circulation structure 21 also includes a second circulation pump, a third circulation pump, a first water circulation branch and a second water circulation branch, the second circulation pump is arranged on the first water circulation branch, the third circulation pump is arranged on the second water circulation branch, and the first water circulation branch and the second water circulation branch are both connected in parallel with the water circulation main road 211. When used in winter, the first circulation pump 212, the second circulation pump and the third circulation pump are used in two ways and one is in standby, and when used at other times, one is used and two are in standby.

[0036] like Figure 3 As shown, in some embodiments, the water replenishment structure 22 further includes a first water replenishment pump 222, a water replenishment tank 223 and a water replenishment valve 224. The first water replenishment pump 222, the water replenishment tank 223 and the water replenishment valve 224 are all arranged on the first water replenishment pipeline 221, and the water replenishment valve 224 is arranged near the water inlet end of the water replenishment tank 223. The water replenishment valve 224 is used to control the amount of softened water supplied to the water replenishment tank 223, and the first water replenishment pump 222 is used to transport the softened water to the water circulation main path 211 through the first water replenishment pipeline 221.

[0037] like Figure 3As shown, in some embodiments, the pressure relief structure 23 further includes a pressure relief valve 232, which is disposed on the pressure relief pipeline 231. The pressure relief valve 232 is used to control the opening and closing of the pressure relief pipeline 231. When the pressure relief valve 232 is opened, the softened water in the water circulation main path 211 is discharged through the pressure relief pipeline 231, thereby reducing the pressure of the water circulation main path 211.

[0038] like Figure 1 As shown, in some embodiments, the heat exchange assembly 10 includes a heat exchanger 11, a purge pipeline 12 and a purge valve 13. The heat exchanger 11 is connected to the main water circulation path 211. The heat exchanger 11 transfers the heat of the flue gas to the main water circulation path 211. The heat exchanger 11 is arranged on the purge pipeline 12, and the purge valve 13 is arranged on the purge pipeline 12. The purge valve 13 can control the opening and closing of the purge pipeline 12. By setting the purge pipeline 12 to achieve timed purge of the heat exchanger 11, the compounds generated by flue gas crystallization inside the heat exchanger 11 can be effectively removed.

[0039] like Figure 1 As shown, in some embodiments, the device further includes a detection component 40, the detection component 40 includes a smoke detection structure 41 and a softened water detection structure 42, the smoke detection structure 41 is arranged on the first smoke pipe 311, and the softened water detection structure 42 is arranged on the water circulation component 20. The smoke detection structure 41 includes a first temperature transmitter, a first differential pressure transmitter and a first pressure transmitter, and the first temperature transmitter, the first differential pressure transmitter and the first pressure transmitter are arranged on the first smoke pipe 311, and the smoke detection structure 41 also includes a second temperature transmitter, a second differential pressure transmitter and a second pressure transmitter, and the second temperature transmitter, the second differential pressure transmitter and the second pressure transmitter are all arranged on the first smoke pipe 311. The first temperature transmitter, the first differential pressure transmitter and the first pressure transmitter are located on one side of the heat exchange component 10, and the second temperature transmitter, the second differential pressure transmitter and the second pressure transmitter are located on the other side of the heat exchange component 10. This arrangement can accurately monitor the change of the flue gas volume in the first flue gas duct 311, and then reflect the flue gas volume in the second flue gas duct 312. The softened water detection structure 42 includes a third temperature transmitter, a third pressure transmitter, a fourth temperature transmitter and a fourth pressure transmitter. The third temperature transmitter, the third pressure transmitter, the fourth temperature transmitter and the fourth pressure transmitter are all arranged on the water circulation main path 211. The third temperature transmitter and the third pressure transmitter are arranged on one side of the heat network, and the fourth temperature transmitter and the fourth pressure transmitter are arranged on the other side of the heat network. This arrangement enables the temperature and pressure of the softened water before and after passing through the heat network to be accurately monitored.

[0040] It should be noted that all valves in this embodiment are solenoid valves, and the device also includes a control component. The control component and the solenoid valve and the detection component 40 are all electrically connected. The control component is a PID controller. The control component can receive a detection signal from the detection component 40 and control the opening of the solenoid valve according to the detection signal, thereby controlling the amount of flue gas in the second flue gas duct 312 and realizing temperature control of softened water.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A flue gas waste heat recovery device, characterized in that: include: Heat exchange component (10); A water circulation component (20), the water circulation component (20) being in communication with the heat exchange component (10); A flue gas component (30), the flue gas component (30) comprising a flue gas duct structure (31), the flue gas duct structure (31) comprising a first flue gas duct (311) and a second flue gas duct (312), the first flue gas duct (311) and the second flue gas duct (312) being arranged in parallel, the first flue gas duct (311) and the second flue gas duct (312) being connected, and the second flue gas duct (312) being connected to the heat exchange component (10).

2. The flue gas waste heat recovery device according to claim 1, characterized in that: The smoke assembly (30) further comprises an adjusting structure (32), the adjusting structure (32) comprising a smoke inlet valve (321), a smoke outlet valve (322) and a smoke exhaust valve (323), the smoke inlet valve (321) and the smoke outlet valve (322) are both arranged on the second smoke duct (312), the smoke inlet valve (321) and the smoke outlet valve (322) are respectively located on two sides of the heat exchange assembly (10), the smoke exhaust valve (323) is arranged on the first smoke duct (311), and the smoke exhaust valve (323) is located between the smoke inlet and the smoke outlet of the second smoke duct (312).

3. The flue gas waste heat recovery device according to claim 2, characterized in that: The smoke duct structure (31) further comprises a first induced draft fan (313), a second induced draft fan (314) and a third smoke duct (315); the first induced draft fan (313) is arranged on the first smoke duct (311); the second induced draft fan (314) is arranged on the third smoke duct (315); the third smoke duct (315) and the first smoke duct (311) are arranged in parallel; and the third smoke duct (315) and the first smoke duct (311) are connected.

4. The flue gas waste heat recovery device according to claim 3, characterized in that: The regulating structure (32) further includes a first regulating valve, a second regulating valve, a third regulating valve and a fourth regulating valve, wherein the first regulating valve and the second regulating valve are both arranged on the first flue gas duct (311), the first regulating valve and the second regulating valve are located on both sides of the first induced draft fan (313), the third regulating valve and the fourth regulating valve are both arranged on the third flue gas duct (315), and the third regulating valve and the fourth regulating valve are located on both sides of the second induced draft fan (314).

5. The flue gas waste heat recovery device according to claim 1, characterized in that: The water circulation component (20) comprises a water circulation structure (21), a water replenishment structure (22) and a pressure relief structure (23); the water circulation structure (21) comprises a water circulation main circuit (211); the water replenishment structure (22) comprises a first water replenishment pipeline (221); the pressure relief structure (23) comprises a pressure relief pipeline (231); the water circulation main circuit (211) is connected to the heat exchange component (10); the first water replenishment pipeline (221) is connected to the water circulation main circuit (211); and the pressure relief pipeline (231) is connected to the water circulation main circuit (211).

6. The flue gas waste heat recovery device according to claim 5, characterized in that: The water circulation structure (21) further comprises a first circulation pump (212), wherein the first circulation pump (212) is arranged on the water circulation main path (211).

7. The flue gas waste heat recovery device according to claim 5, characterized in that: The water replenishment structure (22) further comprises a first water replenishment pump (222), a water replenishment tank (223) and a water replenishment valve (224); the first water replenishment pump (222), the water replenishment tank (223) and the water replenishment valve (224) are all arranged on the first water replenishment pipeline (221); the water replenishment valve (224) is arranged close to the water inlet end of the water replenishment tank (223).

8. The flue gas waste heat recovery device according to claim 5, characterized in that: The pressure relief structure (23) further comprises a pressure relief valve (232), and the pressure relief valve (232) is arranged on the pressure relief pipeline (231).

9. The flue gas waste heat recovery device according to claim 1, characterized in that: The heat exchange assembly (10) comprises a heat exchanger (11), a purge pipeline (12) and a purge valve (13); the heat exchanger (11) is arranged on the purge pipeline (12); and the purge valve (13) is arranged on the purge pipeline (12).

10. The flue gas waste heat recovery device according to any one of claims 1 to 9, characterized in that: The device further comprises a detection component (40), wherein the detection component (40) comprises a smoke detection structure (41) and a softened water detection structure (42), wherein the smoke detection structure (41) is arranged on the first smoke pipe (311), and the softened water detection structure (42) is arranged on the water circulation component (20).

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