A ring-shaped waste heat recovery device

Abstract

This utility model discloses a ring-shaped waste heat recovery device, relating to the field of waste heat recovery technology. The ring-shaped waste heat recovery device includes a waste steam recovery device for condensing and recovering high-temperature waste steam discharged from the exhaust pipe at the top of the condensate tank. The exhaust pipe's outlet is connected to a connecting pipe outlet at one end of the waste steam recovery device. The waste steam recovery device is positioned above the exhaust pipe, allowing the waste steam in the condensate tank to enter the waste steam recovery device for condensation through the exhaust pipe. This utility model achieves efficient waste steam condensation and waste heat recovery by installing a waste steam recovery device with a built-in staged spray system and heat exchange perforated plate at the outlet of the condensate tank's exhaust pipe. It also offers comprehensive advantages such as energy saving, anti-icing and noise reduction, safety and reliability, low investment, and maintenance-free operation.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a ring-shaped waste heat recovery device. Background Technology

[0002] In industrial production processes, steam systems are widely used in heating, heat tracing, sterilization and other processes. The condensate generated during operation is usually discharged into the steam trap through the steam trap valve. After depressurization, some of the high-temperature condensate in the steam trap flashes into exhaust steam. At the same time, the steam traps of instrument steam tracing and other branch condensates also continuously generate steam, which means that a large amount of low-temperature saturated steam in the trap needs to be directly discharged into the atmosphere through the top exhaust pipe.

[0003] This traditional direct exhaust method has a simple structure but significant drawbacks: Firstly, the exhaust steam carries a large amount of latent heat, which is wasted, resulting in reduced energy utilization. Secondly, in cold winter conditions, the high-temperature exhaust steam condenses rapidly upon cooling, forming "white fog" that may freeze on the ground, affecting the cleanliness of the plant area and increasing the risk of accidents such as slips and falls. Furthermore, the noise generated by high-speed exhaust also negatively impacts the occupational health of operators. While some existing technologies include condensation recovery devices, they generally suffer from complex structures, high investment costs, and difficult maintenance, making them unsuitable for widespread application in small and medium-sized steam systems. Utility Model Content

[0004] This utility model provides a ring-shaped waste heat recovery device, including a waste steam recovery device. The waste steam recovery device is used to condense and recover the high-temperature waste steam discharged from the exhaust pipe at the top of the condensate tank. The exhaust pipe is connected to the steam outlet of a connecting pipe at one end of the waste steam recovery device. The waste steam recovery device is located above the exhaust pipe, so that the waste steam in the condensate tank enters the waste steam recovery device through the exhaust pipe for condensation.

[0005] Preferably, the exhaust pipe is equipped with two sets of annular spray elements, the inlets of the two sets of annular spray elements are connected to the outlet of the water supply pipe, the inlet of the water supply pipe is connected to the demineralized water supply system of the plant area, and valves are installed on the pipes of the inlets of the two sets of annular spray elements.

[0006] Preferably, the exhaust steam recovery device has a steam inlet main pipe on one side of the cylinder. The steam inlet main pipe is horizontally connected and divided into four steam inlet branch pipes. The four steam inlet branch pipes are evenly distributed on one side of the exhaust steam recovery device, so that the exhaust steam diffuses evenly in the exhaust steam recovery device after entering.

[0007] Preferably, the upper side wall of the waste steam recovery device is provided with a water supply pipe, which is connected to spray pipe one and spray pipe two inside the waste steam recovery device, and is used to supply cooling water to the waste steam recovery device.

[0008] Preferably, a water supply valve is installed on the water supply pipe.

[0009] Preferably, the first water spray pipe is located in the lower middle part of the waste steam recovery device and sprays water downwards for initial contact and heat exchange with the rising waste steam. The second water spray pipe is located in the upper part of the waste steam recovery device and sprays water downwards to form a continuous water film at the top of the waste steam recovery device, which is used to intercept and cool the residual rising waste steam.

[0010] Preferably, the waste steam recovery device is provided with a horizontally arranged heat exchange orifice plate, which is located above the first water spray pipe and below the second water spray pipe. The surface of the heat exchange orifice plate is provided with evenly distributed small holes, which allows the waste steam after preliminary cooling to pass through the heat exchange orifice plate and continue to rise, while blocking large droplets from falling.

[0011] Preferably, the bottom of the waste steam recovery device is provided with a condensate recovery header pipe, and the outlet of the condensate recovery header pipe is connected to the inlet of the condensate tank.

[0012] Preferably, the condensate after condensation is mixed with the spray water and then flows down the inner wall of the waste steam recovery device to the bottom collection area. It is then discharged back into the original condensate tank through the condensate recovery header and finally transported to the original water tank by the condensate pump.

[0013] Preferably, the waste steam recovery device is provided with a vent at the top, which is connected to a safety discharge system for releasing overpressure when the internal pressure of the waste steam recovery device is abnormal.

[0014] The annular waste heat recovery device provided in this embodiment of the utility model, compared with the prior art:

[0015] 1. This utility model achieves efficient condensation and waste heat recovery of high-temperature waste steam by adding a waste steam recovery device to the exhaust pipe outlet at the top of the condensate tank and setting up a graded spray system and heat exchange perforated plate structure inside the device. After the waste steam enters the device, it first contacts and exchanges heat with the demineralized water sprayed from the middle and lower spray pipes to achieve initial cooling. Then, it passes through the porous heat exchange perforated plate and further contacts and condenses with the water film formed by the upper spray pipe. Most of the waste steam is converted into condensate and returned to the condensate tank through the condensate recovery header. This not only effectively recovers the latent heat of steam and improves the thermal efficiency of the system, but also avoids the energy waste caused by direct discharge of waste steam. The structure is reasonably designed, with smooth gas-liquid flow, sufficient condensation, high heat recovery rate, and wide applicability.

[0016] 2. This utility model effectively prevents the risk of overpressure inside the device by setting a top steam vent as a safe pressure relief channel. The multi-stage spray and orifice plate work together to avoid the phenomenon of steam condensing into ice in winter under the traditional direct discharge method, eliminating the safety hazards caused by ground icing. At the same time, it reduces high noise emissions and improves the working environment. The entire system has a compact structure, and the modification does not require replacing the original condensate tank. Only a recovery device needs to be added to the end of the steam vent pipe. The installation is simple, the initial investment is small, there is no need for a complex control system, and there is no need for maintenance in the later stage. The operating cost is low. The water supply pipeline is equipped with a water supply valve, which can automatically adjust the water spray volume according to the working conditions. The system is simple, reliable and easy to operate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the exhaust pipe according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the waste steam recovery device according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal structure of the waste steam recovery device according to an embodiment of the present invention;

[0022] Figure 5 This is a top view schematic diagram of the waste steam recovery device according to an embodiment of the present invention;

[0023] Figure 6 This is a cross-sectional schematic diagram of the waste steam recovery device according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the structure of water spray pipe one and water spray pipe two according to an embodiment of this utility model;

[0025] Figure 8 This is a schematic diagram of the heat exchanger orifice plate structure according to an embodiment of the present invention.

[0026] Figure label:

[0027] 1. Drain tank; 2. Drain pump; 3. Exhaust pipe; 4. Annular spray assembly; 5. Water supply pipe; 6. Valve; 7. Waste steam recovery device; 8. Steam inlet main pipe; 9. Steam inlet branch pipe; 10. Connecting pipe; 11. Exhaust port; 12. Condensate recovery main pipe; 13. Heat exchange orifice plate; 14. Water supply pipe; 15. Water supply valve; 16. Spray pipe one; 17. Spray pipe two. Detailed Implementation

[0028] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] Please refer to Figures 1-8 This utility model provides an annular waste heat recovery device, including a waste steam recovery device 7, which is used to condense and recover the high-temperature waste steam discharged from the exhaust pipe 3 at the top of the condensate tank 1.

[0030] The condensate tank 1 is used to collect high-temperature condensate from various process units and instrument heating condensate. When the liquid level in the tank reaches the set value, the condensate is transported to the raw water tank or other water systems by the condensate pump 2. Due to the high temperature of the condensate, some of the water flashes into exhaust steam after depressurization and is discharged upward through the exhaust pipe 3 set at the top of the condensate tank 1.

[0031] A waste steam recovery device 7 is installed at the outlet of the exhaust pipe 3. The two are sealed together by a connecting pipe 10. One end of the connecting pipe 10 is connected to the outlet of the exhaust pipe 3, and the other end is connected to the steam inlet of the waste steam recovery device 7, so that the waste steam that was originally discharged directly into the atmosphere is guided into the interior of the waste steam recovery device 7 for condensation treatment.

[0032] like Figure 2 As shown, further, the exhaust pipe 3 is equipped with two sets of annular spray elements 4. Each set of annular spray elements 4 consists of an annular pipe and multiple atomizing nozzles, which are evenly arranged on the inner wall of the exhaust pipe 3. The water inlets of the two sets of annular spray elements 4 are connected to the demineralized water supply system of the plant area through water supply pipes 5. Valves 6 are installed on the water supply pipes 5 to control the spray water volume. When the high-temperature exhaust steam flows through the exhaust pipe 3, the demineralized water is sprayed downward through the annular spray elements 4 and comes into direct contact with the rising steam to achieve preliminary cooling and partial condensation.

[0033] The exhaust steam recovery device 7 has an inlet main pipe 8 on one side of the cylinder. The inlet main pipe 8 is horizontally connected to the device and is divided into four inlet branch pipes 9. The four inlet branch pipes 9 are evenly distributed on one side of the cylinder, so that the exhaust steam entering the device can be evenly diffused, avoiding local airflow deviation and improving subsequent condensation efficiency.

[0034] A water supply pipe 14 is provided on the upper side wall of the waste steam recovery device 7. The water supply pipe 14 is connected to the inside of the device by means of flange or welding, and is connected to two spray branch pipes: spray pipe one 16 and spray pipe two 17. A water supply valve 15 is installed on the water supply pipe 14, which can automatically adjust the opening degree according to the waste steam flow or system pressure to achieve water supply on demand.

[0035] like Figure 7 As shown, spray pipe 16 is located in the lower middle part of the exhaust steam recovery device 7 and is arranged downwards. It is used to spray cooling water onto the rising exhaust steam to achieve initial contact heat exchange and reduce the temperature of the exhaust steam. Spray pipe 17 is located in the upper part of the device and sprays water downwards to form a continuous water film on the top of the device. It is used to intercept residual steam and further enhance the condensation effect.

[0036] A horizontally arranged heat exchange orifice plate 13 is provided between water spray pipe 16 and water spray pipe 17. The heat exchange orifice plate 13 is fixed to the inner wall of the device. Multiple evenly distributed small holes are opened on its plate surface. The exhaust steam after preliminary cooling can pass through the porous structure and continue to rise, while larger liquid droplets are blocked by the heat exchange orifice plate 13 and flow down along the wall surface to prevent them from being entrained into the upper area.

[0037] After condensation, the condensate mixes with the unevaporated spray water and flows down the inner wall of the waste steam recovery device 7 to the bottom collection area. The bottom of the waste steam recovery device 7 is equipped with a condensate recovery header 12. One end of the condensate recovery header 12 is connected to the collection area, and the other end is connected to the inlet of the condensate tank 1, so that the recovered condensate is returned to the system, realizing the dual utilization of water resources and heat energy.

[0038] To ensure the safe operation of the system, the exhaust steam recovery device 7 is equipped with an exhaust port 11 at the top. The exhaust port 11 is connected to the safety discharge system or the high-altitude discharge pipe, which is used to automatically release pressure when the internal pressure of the device rises abnormally, so as to prevent the risk of overpressure.

[0039] All components are made of corrosion-resistant materials (such as 304 or 316L stainless steel), making it suitable for industrial waste steam recovery scenarios with temperatures not exceeding 150°C. The device has a compact structure, is easy to install, requires no additional power equipment, and requires virtually no maintenance in the later stages, making it economical and scalable.

[0040] In summary, the high-temperature exhaust steam in the condensate tank 1 first rises through the exhaust pipe 3 and is initially cooled by the demineralized water sprayed by the two sets of annular spray nozzles 4. Then, the exhaust steam enters the exhaust steam recovery device 7 and is evenly distributed through the four steam inlet branch pipes 9. It then comes into contact with the cold water sprayed by the first spray pipe 16 for further heat exchange, achieving secondary cooling. The cooled exhaust steam passes through the porous heat exchange plate 13 and comes into contact with the water film formed by the second spray pipe 17. Most of the steam is condensed into liquid water. The condensate flows along the inner wall of the device to the bottom and returns to the condensate tank 1 through the condensate recovery header 12. The remaining small amount of non-condensable gas or uncondensed steam is safely discharged through the top exhaust port 11.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ring-shaped waste heat recovery device, characterized in that: It includes a waste steam recovery device (7), which is used to condense and recover the high-temperature waste steam discharged from the exhaust pipe (3) at the top of the condensate tank (1). The exhaust pipe (3) is connected to the steam outlet of the connecting pipe (10) at one end of the waste steam recovery device (7). The waste steam recovery device (7) is located above the exhaust pipe (3), so that the waste steam in the condensate tank (1) enters the interior of the waste steam recovery device (7) through the exhaust pipe (3) for condensation treatment.

2. The annular waste heat recovery device according to claim 1, characterized in that: The exhaust pipe (3) is equipped with two sets of annular spray elements (4). The inlets of the two sets of annular spray elements (4) are connected to the outlet of the water supply pipe (5). The inlet of the water supply pipe (5) is connected to the demineralized water supply system of the plant area. Valves (6) are installed on the pipes of the inlets of the two sets of annular spray elements (4).

3. The annular waste heat recovery device according to claim 2, characterized in that: The waste steam recovery device (7) has a steam inlet main pipe (8) on one side of the cylinder. The steam inlet main pipe (8) is horizontally connected and divided into four steam inlet branch pipes (9). The four steam inlet branch pipes (9) are evenly distributed on one side of the waste steam recovery device (7) so that the waste steam diffuses evenly in the waste steam recovery device (7) after entering.

4. The annular waste heat recovery device according to claim 3, characterized in that: The upper side wall of the waste steam recovery device (7) is provided with a water supply pipe (14), which is connected to the first water spray pipe (16) and the second water spray pipe (17) inside the waste steam recovery device (7) to supply cooling water to the waste steam recovery device (7).

5. The annular waste heat recovery device according to claim 4, characterized in that: A water supply valve (15) is installed on the water supply pipe (14).

6. The annular waste heat recovery device according to claim 5, characterized in that: The first water spray pipe (16) is located in the lower middle part of the waste steam recovery device (7) and sprays water downwards to make initial contact with the rising waste steam for heat exchange. The second water spray pipe (17) is located in the upper part of the waste steam recovery device (7) and sprays water downwards to form a continuous water film at the top of the waste steam recovery device (7) to intercept and cool the residual rising waste steam.

7. The annular waste heat recovery device according to claim 6, characterized in that: The waste steam recovery device (7) is equipped with a horizontally arranged heat exchange orifice plate (13). The heat exchange orifice plate (13) is located above the first water spray pipe (16) and below the second water spray pipe (17). The surface of the heat exchange orifice plate (13) is provided with evenly distributed small holes, which allow the waste steam after preliminary cooling to pass through the heat exchange orifice plate (13) and continue to rise, while blocking large droplets from falling.

8. The annular waste heat recovery device according to claim 7, characterized in that: The bottom of the waste steam recovery device (7) is provided with a condensate recovery header pipe (12), and the outlet of the condensate recovery header pipe (12) is connected to the inlet of the condensate drain tank (1).

9. The annular waste heat recovery device according to claim 8, characterized in that: After condensation, the condensate mixes with the spray water and flows down the inner wall of the waste steam recovery device (7) to the bottom collection area. It is then discharged back into the original condensate tank (1) through the condensate recovery header (12) and finally transported to the original water tank by the condensate pump (2).

10. The annular waste heat recovery device according to claim 9, characterized in that: The exhaust steam recovery device (7) is provided with an exhaust port (11) at the top. The exhaust port (11) is connected to the safety discharge system and is used to release overpressure when the internal pressure of the exhaust steam recovery device (7) is abnormal.

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