An integrated system for condensate devaporization and waste heat recovery

Abstract

This utility model relates to the field of condensate recovery technology, specifically to an integrated system for condensate devastation and waste heat recovery, comprising a heat exchanger and a flash tank. High-temperature condensate enters the flash tank for flash separation. The resulting flash vapor is rapidly condensed by a wire mesh liquid film formed by atomized low-temperature condensate. The separated medium-temperature condensate is cooled by the heat exchanger and then recycled to cool the flash vapor. This system achieves three advantages through the coordinated operation of the flash tank and the heat exchanger: 1) eliminating water hammer effect using the wire mesh liquid film; 2) efficiently recovering the latent heat of the flash vapor through atomized low-temperature water, improving thermal efficiency; 3) enhancing system stability and reducing maintenance costs through a self-circulating design; 4) the medium-temperature condensate separated in the flash tank is transported through pipelines to the first input interface of the heat exchanger for efficient heat exchange with the medium to be heated within the heat exchanger, achieving full recovery of condensate heat.

Description

Technical Field

[0001] This utility model relates to the field of condensate recovery technology, specifically to an integrated system for condensate devastation and waste heat recovery. Background Technology

[0002] Currently, industrial applications primarily utilize two methods for waste heat recovery from high-temperature condensate: direct heat exchange and flash desteaming. Direct heat exchange involves the condensate entering a heat exchanger to exchange heat with the refrigerant, recovering some heat before discharge. However, this method has low thermal efficiency. Flash desteaming separates some steam in a flash tank, but the flash steam is often directly discharged or simply recovered, while the remaining condensate is recycled. However, these methods generally rely on manual adjustment or basic liquid level control, resulting in low automation and consequently, low operating efficiency.

[0003] Existing technologies have significant drawbacks: First, when the vapor-liquid two-phase flow of high-temperature condensate directly enters the heat exchanger, it easily triggers a severe water hammer effect. Long-term impact can damage pipes, valves, and the heat exchanger, shortening equipment lifespan. Second, the steam generated by flash evaporation is not fully utilized, resulting in the direct discharge of a large amount of low-grade heat energy and energy waste. Furthermore, manual or simple control makes it difficult to dynamically adjust flow rate and liquid level, easily leading to system fluctuations, equipment overload, and increased maintenance costs and operational risks. These problems severely restrict the efficiency and reliability of condensate waste heat recovery, necessitating a more optimized solution.

[0004] In summary, existing condensate waste heat recovery technologies suffer from problems such as water hammer effect damaging equipment, heat waste, or low operating efficiency, making it difficult to balance safety, energy saving, and efficient operation. Utility Model Content

[0005] The first purpose of this invention is to overcome the problem that existing condensate recovery technologies cannot simultaneously achieve safety, energy saving, and high efficiency, and to provide an integrated system for condensate degassing and waste heat recovery.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] An integrated system for condensate devaporization and waste heat recovery includes a heat exchanger and a flash tank. The heat exchanger has a first input interface and a first output interface, which are connected through a heat exchange channel. The flash tank has a flash inlet, a liquid outlet, and a coolant inlet. The coolant inlet is equipped with an atomizing nozzle, and its inner cavity is equipped with a wire mesh. The flash inlet of the flash tank is used to receive high-temperature condensate. Its liquid outlet is connected to the first input interface of the heat exchanger through a medium-temperature condensate pipe, and its coolant inlet is connected to the first output interface of the heat exchanger through a low-temperature condensate pipe to receive low-temperature condensate formed by cooling inside the heat exchanger. The atomizing nozzle atomizes the low-temperature condensate and sprays it onto the wire mesh to form a low-temperature liquid film.

[0008] This utility model achieves efficient devastation and waste heat recovery of condensate through the coordinated operation of a flash tank and a heat exchanger. Its working principle is as follows: after high-temperature condensate enters the flash tank, flash separation occurs. The generated flash vapor rises and comes into contact with the low-temperature liquid film formed by the atomizing nozzle and is rapidly condensed. At the same time, the separated condensate enters the heat exchanger for cooling and recycling. This solution has the following core advantages: (1) Elimination of water hammer effect: through the vapor-liquid separation effect of the wire mesh liquid film, the vapor-water mixture is prevented from entering the pipeline; (2) Significantly improved heat recovery efficiency: the latent heat of flash vapor is fully recovered by atomized low-temperature condensate, overcoming the problem of heat energy waste in traditional technology; (3) More stable system operation: the self-circulating structural design reduces the need for manual intervention and lowers maintenance costs; (4) the medium-temperature condensate separated by the flash tank is transported through the pipeline to the first input interface of the heat exchanger, where it undergoes efficient heat exchange with the medium to be heated in the heat exchanger, achieving full recovery of condensate heat.

[0009] Furthermore, the flash tank also has an overflow port, which is connected to an external drainage point via an overflow pipe. In this design, when the condensate level is too high, the overflow port automatically discharges excess liquid to the external drainage point, protecting the structural integrity of the equipment and improving system reliability.

[0010] Furthermore, the atomizing nozzle is a spiral nozzle. Compared to existing DC nozzles, the atomizing nozzle in this solution improves atomization uniformity and ensures complete coverage of the wire mesh liquid film. Further, it also includes a level gauge and a condensate delivery pump. The level gauge is installed on the flash tank, and the condensate delivery pump is installed on the medium-temperature condensate pipeline. The condensate delivery pump starts and stops based on the feedback value from the level gauge. In this solution, the level gauge detects the liquid level in real time, and the pump start and stop are adjusted through a PID controller to control the liquid level in the flash tank within a set fluctuation range, avoiding pump cavitation due to excessively low liquid levels and impact on the flash space due to excessively high liquid levels.

[0011] Furthermore, it also includes a condensate transfer pump outlet valve, which is installed on the medium-temperature condensate pipeline and located on the output end side of the condensate transfer pump.

[0012] Furthermore, the system also includes a low-temperature condensate inlet valve, a condensate recovery regulating valve, and a condensate recovery manual valve. The low-temperature condensate inlet valve is located in the low-temperature condensate pipeline. The condensate recovery regulating valve and the condensate recovery manual valve are connected in series and connected to an external condensate recovery point through a condensate recovery pipeline. The input end of the condensate recovery pipeline is connected in parallel with the input end of the low-temperature condensate inlet valve. In this solution, the automatic control of the condensate level in the flash tank can be achieved by dynamically adjusting the opening of the condensate recovery regulating valve.

[0013] Furthermore, it also includes a flash tank drain valve, which is connected to an external drain point via a drain pipe, and the drain pipe is connected in parallel to the input end of the medium-temperature condensate pipe.

[0014] Furthermore, the wire mesh is horizontally arranged in the upper part of the inner cavity of the flash tank, and the flash inlet is located on the side wall of the flash tank and below the wire mesh.

[0015] Furthermore, it also includes a condensate delivery bypass valve, which is installed on the medium-temperature condensate pipeline through a bypass delivery pipeline, and the input of the bypass delivery pipeline is connected in parallel with the input end of the condensate delivery pump, and the output end is connected in parallel with the output end of the condensate delivery pump outlet valve.

[0016] Furthermore, the flash tank is arranged longitudinally, and the coolant inlet and liquid outlet are respectively located at the top and bottom of the flash tank.

[0017] Furthermore, the wire mesh has multiple layers. Attached Figure Description

[0018] Figure 1 This is the schematic diagram of the system;

[0019] Figure 2 A schematic diagram of the system Figure 2 .

[0020] Label Explanation:

[0021] 1. Heat exchanger; 2. Flash tank; 3. First input interface; 4. First output interface; 5. Flash inlet; 6. Liquid outlet; 7. Coolant inlet; 8. Atomizing nozzle; 9. Wire mesh; 10. Overflow port; 11. Medium-temperature condensate pipe; 12. Low-temperature condensate pipe; 13. Overflow pipe; 14. Condensate recovery pipe; 15. Sewage pipe; 16. Bypass conveying pipe; 17. Condensate conveying pump; 18. Level gauge; 19. Condensate conveying pump outlet valve; 20. Low-temperature condensate inlet valve; 21. Condensate recovery regulating valve; 22. Condensate recovery manual valve; 23. Flash tank drain valve; 24. Condensate conveying bypass valve. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0023] See Figure 1-2As shown, this utility model discloses an integrated system for condensate devaporization and waste heat recovery, including a heat exchanger 1 and a flash tank 2. The heat exchanger 1 is provided with a first input interface 3 and a first output interface 4, which are connected through a heat exchange channel. The flash tank 2 is provided with a flash inlet 5, a liquid outlet 6, and a coolant inlet 7. An atomizing nozzle 8 is provided at the coolant inlet 7, and a wire mesh 9 is provided in its inner cavity. The flash inlet 5 of the flash tank 2 is used to connect high-temperature condensate, and its liquid outlet 6 is connected through... The medium-temperature condensate pipe 11 is connected to the first input interface 3 of the heat exchanger 1 to transport the medium-temperature condensate formed by flash evaporation to the heat exchanger 1 for heat exchange. Its coolant inlet 7 is connected to the first output interface 4 of the heat exchanger 1 through the low-temperature condensate pipe 12 to receive the low-temperature condensate formed by cooling in the heat exchanger 1. The atomizing nozzle 8 atomizes the low-temperature condensate and sprays it onto the wire mesh 9 to form a low-temperature liquid film on the surface of the wire mesh 9. When the high-temperature flash vapor passes through the wire mesh 9, it is rapidly cooled and condensed by the low-temperature liquid film.

[0024] To improve system reliability, the flash tank 2 is also equipped with an overflow port 10, which is connected to an external drain point via an overflow pipe 13. In this way, when the condensate level is too high, the overflow port 10 automatically discharges excess liquid to the external drain point, protecting the structural integrity of the equipment.

[0025] The atomizing nozzle 8 described above is a spiral nozzle. Compared with existing DC nozzles, the atomizing nozzle 8 in this solution can improve atomization uniformity and ensure complete liquid film coverage of the screen 9.

[0026] In one embodiment, the system further includes a level gauge 18 and a condensate transfer pump 17. The level gauge 18 is mounted on the flash tank 2, and the condensate transfer pump 17 is mounted on the medium-temperature condensate pipeline 11. The condensate transfer pump 17 starts and stops based on the feedback value from the level gauge 18. In this solution, the level gauge 18 detects the liquid level in real time, and the pump is started and stopped by a PID controller to keep the liquid level in the flash tank 2 within a set fluctuation range, avoiding pump cavitation due to excessively low liquid level and affecting the flash space due to excessively high liquid level.

[0027] In one embodiment, a condensate transfer pump outlet valve 19 is also included. The condensate transfer pump outlet valve 19 is disposed on the medium-temperature condensate pipeline 11 and located on the output end side of the condensate transfer pump 17.

[0028] In one embodiment, the system further includes a low-temperature condensate inlet valve 20, a condensate recovery regulating valve 21, and a condensate recovery manual valve 22. The low-temperature condensate inlet valve 20 is located on the low-temperature condensate pipeline 12. The condensate recovery regulating valve 21 and the condensate recovery manual valve 22 are connected in series and connected to an external condensate recovery point through a condensate recovery pipeline 14. The input end of the condensate recovery pipeline 14 is connected in parallel with the input end of the low-temperature condensate inlet valve 20. In this solution, the automatic control of the condensate level in the flash tank 2 can be achieved by dynamically adjusting the opening of the condensate recovery regulating valve 21.

[0029] In one embodiment, a flash tank drain valve 23 is also included. The flash tank drain valve 23 is connected to an external drain point via a drain pipe 15, which is connected in parallel to the input end of the medium-temperature condensate pipe 11.

[0030] In one embodiment, the wire mesh 9 is horizontally disposed in the upper part of the inner cavity of the flash tank 2, and the flash inlet 5 is disposed on the side wall of the flash tank 2 and located below the wire mesh 9.

[0031] In one embodiment, a condensate delivery bypass valve 24 is also included. The condensate delivery bypass valve 24 is installed on the medium-temperature condensate pipeline 11 through a bypass delivery pipeline 16. The input of the bypass delivery pipeline 16 is connected in parallel with the input end of the condensate delivery pump 17, and the output end is connected in parallel with the output end of the condensate delivery pump outlet valve 19.

[0032] In one embodiment, the flash tank 2 is arranged longitudinally, and the coolant inlet 7 and the liquid outlet 6 are respectively located at the top and bottom of the flash tank 2.

[0033] This utility model achieves efficient devastation and waste heat recovery of condensate through the coordinated operation of a flash tank and a heat exchanger. Its working principle is as follows: after high-temperature condensate enters the flash tank, flash separation occurs. The generated flash vapor rises and comes into contact with the low-temperature liquid film formed by the atomizing nozzle and is rapidly condensed. At the same time, the separated condensate enters the heat exchanger for cooling and recycling. This solution has the following core advantages: (1) Elimination of water hammer effect: through the vapor-liquid separation effect of the wire mesh liquid film, the vapor-water mixture is prevented from entering the pipeline; (2) Significantly improved heat recovery efficiency: the latent heat of flash vapor is fully recovered by atomizing low-temperature condensate, overcoming the problem of heat energy waste in traditional technology; (3) More stable system operation: the self-circulating structural design reduces the need for manual intervention and lowers maintenance costs.

[0034] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An integrated system for condensate devaporization and waste heat recovery, characterized in that, include: The heat exchanger (1) is provided with a first input interface (3) and a first output interface (4), and the first input interface (3) and the first output interface (4) are connected through a heat exchange channel; The flash tank (2) is provided with a flash inlet (5), a liquid outlet (6) and a coolant inlet (7). An atomizing nozzle (8) is provided at the coolant inlet (7), and a wire mesh (9) is provided in its inner cavity. The flash inlet (5) of the flash tank (2) is used to access high-temperature condensate. Its liquid outlet (6) is connected to the first input interface (3) of the heat exchanger (1) through the medium-temperature condensate pipe (11). Its coolant inlet (7) is connected to the first output interface (4) of the heat exchanger (1) through the low-temperature condensate pipe (12) to access the low-temperature condensate formed by cooling in the heat exchanger (1). The atomizing nozzle (8) atomizes the low-temperature condensate and sprays it onto the wire mesh (9) to form a low-temperature liquid film.

2. The integrated system according to claim 1, characterized in that: The flash tank (2) also has an overflow port (10), which is connected to an external sewage discharge point through an overflow pipe (13).

3. The integrated system according to claim 1, characterized in that: The atomizing nozzle (8) is a spiral nozzle.

4. The integrated system according to claim 1, characterized in that: It also includes a condensate transfer pump outlet valve (19), which is installed on the medium-temperature condensate pipeline (11) and located on the output side of the condensate transfer pump (17).

5. The integrated system according to claim 4, characterized in that: It also includes a low-temperature condensate inlet valve (20), a condensate recovery regulating valve (21), and a condensate recovery manual valve (22). The low-temperature condensate inlet valve (20) is located on the low-temperature condensate pipeline (12). The condensate recovery regulating valve (21) and the condensate recovery manual valve (22) are connected in series and connected to an external condensate recovery point through a condensate recovery pipeline (14). The input end of the condensate recovery pipeline (14) is connected in parallel with the input end of the low-temperature condensate inlet valve (20).

6. The integrated system according to claim 4, characterized in that: It also includes a flash tank drain valve (23), which is connected to an external drain point through a drain pipe (15), and the drain pipe (15) is connected in parallel to the input end of the medium-temperature condensate pipe (11).

7. The integrated system according to claim 6, characterized in that: The wire mesh (9) is horizontally arranged in the upper part of the inner cavity of the flash tank (2), and the flash inlet (5) is located on the side wall of the flash tank (2) and below the wire mesh (9).

8. The integrated system according to claim 6, characterized in that: It also includes a condensate delivery bypass valve (24), which is installed on the medium-temperature condensate pipeline (11) through a bypass delivery pipeline (16). The input of the bypass delivery pipeline (16) is connected in parallel with the input end of the condensate delivery pump (17), and the output end is connected in parallel with the output end of the condensate delivery pump outlet valve (19).

9. The integrated system according to claim 6, characterized in that: The flash tank (2) is arranged longitudinally, and the coolant inlet (7) and the liquid outlet (6) are respectively located at the top and bottom of the flash tank (2).

10. The integrated system according to claim 1, characterized in that: The wire mesh (9) has multiple layers.

Images