Cooling water heat recovery system for power plant

Abstract

The utility model relates to a power plant cooling water heat recovery system which is characterized in that cooling water of power plant equipment enters heat exchange equipment through a first water inlet pipe, the heat exchange equipment transfers heat in the cooling water to recovery circulating water, and the recovery circulating water is fed into a heat pump unit through a second water inlet pipe; the cooling water after heat exchange returns to the power plant equipment through the first water outlet pipe, the recycled circulating water after heat exchange returns to the heat exchange equipment through the second water outlet pipe, and in the process that the cooling water enters the heat exchange equipment through the first water inlet pipe, the cooling water can pass through the connecting pipe and the filtering mechanism, so that the heat of the cooling water in the power plant equipment is recovered. The impurities in the cooling water are filtered, and are prevented from entering the heat exchange equipment to cause blockage of the heat exchange equipment, so that the impurities in the cooling water of the power plant equipment can be conveniently filtered.

Description

Technical Field

[0001] This utility model relates to the field of mechanical design technology, specifically to a power plant cooling water heat recovery system. Background Technology

[0002] In the field of thermal power generation, power plant turbines and other equipment generate a large amount of low-temperature waste heat during operation. Traditionally, this waste heat is directly discharged into the environment through cooling towers, resulting in energy waste. With the advancement of the national "dual-carbon" strategy, waste heat recovery and utilization technologies have been widely applied, with heat pump units combined with heat exchange equipment becoming the mainstream technical solution. This system transfers heat from the power plant's cooling water to the recycled circulating water through heat exchange equipment. The heat pump unit then enhances the heat energy quality for use in heating or power generation, achieving cascaded energy utilization.

[0003] In practical applications of waste heat recovery systems, power plant circulating cooling water inevitably carries various impurities such as pipe corrosion products and microbial metabolic products during continuous operation. When these impurities enter the heat exchange equipment with the water flow, they are prone to deposition inside the heat exchange tube bundle, forming fouling thermal resistance and significantly affecting the normal operation efficiency of the waste heat recovery device. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a power plant cooling water heat recovery system that can filter impurities in cooling water, preventing them from entering the heat exchange equipment and causing blockages.

[0005] This utility model is achieved through the following technical solution: a power plant cooling water heat recovery system is provided, including power plant equipment, heat exchange equipment and heat pump unit. The power plant equipment is connected to the heat exchange equipment through a first inlet pipe and a first outlet pipe. The heat exchange equipment is connected to the heat pump unit through a second inlet pipe and a second outlet pipe. The first inlet pipe includes two connecting pipes that are respectively connected to the output end of the power plant equipment and the heat exchange equipment, and a filter mechanism disposed between the two connecting pipes and connected to the connecting pipes.

[0006] In use, this invention involves setting up power plant equipment, heat exchange equipment, and a heat pump unit. The power plant equipment is connected to the heat exchange equipment via a first inlet pipe and a first outlet pipe. The heat exchange equipment is connected to the heat pump unit via a second inlet pipe and a second outlet pipe. The first inlet pipe includes two connecting pipes that are respectively connected to the output end of the power plant equipment and the heat exchange equipment, as well as a filter mechanism disposed between the two connecting pipes and connected to them. During use, the cooling water from the power plant equipment enters the heat exchange equipment through the first inlet pipe, allowing the heat exchange equipment to transfer heat from the cooling water to the recycled circulating water. The recycled circulating water is then sent to the heat pump unit through the second inlet pipe, thereby recovering heat from the cooling water in the power plant equipment. The cooled water after heat exchange returns to the power plant equipment through the first outlet pipe, and the recycled circulating water returns to the heat exchange equipment through the second outlet pipe. During the process of the cooling water entering the heat exchange equipment through the first inlet pipe, it passes through the connecting pipes and the filter mechanism, thereby filtering out impurities in the cooling water and preventing impurities from entering the heat exchange equipment and causing blockage.

[0007] Preferably, the filtration mechanism includes a circular tube disposed at one end of a connecting tube. A first connecting groove is formed on one end face of the circular tube, and a first rubber pad is fixedly connected to the bottom of the first connecting groove. One end of the connecting tube is located within the first connecting groove and abuts against the first rubber pad. A rotating cylinder is coaxially disposed on the other end face of the circular tube, and a first cylindrical cylinder located within the rotating cylinder is coaxially fixedly connected to the other end face of the circular tube. A protrusion is fixedly connected to the outer wall of the first cylindrical cylinder. A second rubber pad, conforming to the protrusion and the outer wall of the first cylindrical cylinder, is disposed between the rotating cylinder and the first cylindrical cylinder. A second cylinder, coaxial with the circular tube, is provided between the rotating cylinder and the second rubber pad. A first limiting groove adapted to the second rubber pad is provided on the inner side wall of the second cylinder. A threaded groove is provided on the inner side wall of the rotating cylinder. A threaded protrusion screwed into the threaded groove is provided on the outer side wall of the second cylinder. A second connecting groove is provided on the end face of the second cylinder away from one of the connecting pipes. A third rubber pad is fixed to the bottom of the second connecting groove. The end of the other connecting pipe is located in the second connecting groove and abuts against the third rubber pad. A filter screen is sealed and fixed to the inner side wall of the circular tube.The filtration mechanism includes a circular tube disposed at one end of a connecting pipe. A first connecting groove is formed on one end face of the circular tube, and a first rubber pad is fixedly connected to the bottom of the first connecting groove. One end of the connecting pipe is located within the first connecting groove and abuts against the first rubber pad. A rotating cylinder is coaxially disposed on the other end face of the circular tube, and a first cylinder located within the rotating cylinder is coaxially fixedly connected to the other end face of the circular tube. A protrusion is fixedly connected to the outer wall of the first cylinder. A second rubber pad, conforming to the protrusion and the outer wall of the first cylinder, is disposed between the rotating cylinder and the first cylinder. A second cylinder, coaxial with the circular tube, is disposed between the rotating cylinder and the second rubber pad. A first limiting groove, adapted to the second rubber pad, is formed on the inner wall of the second cylinder. A threaded groove is formed on the inner wall of the rotating cylinder. A threaded protrusion, threadedly connected to the threaded groove, is formed on the outer wall of the second cylinder. A second connecting groove is formed on the end face of the second cylinder away from one of the connecting pipes, and a third rubber pad is fixedly connected to the bottom of the second connecting groove. The end of the other connecting pipe is located within the second connecting groove and abuts against the third rubber pad. A filter screen is sealed and fixed to the wall. When the device is in use, if the operator wants to replace the filter screen after prolonged use, they need to simultaneously control the round tube and one of the connecting tubes, keeping them relatively fixed. Then, by controlling the rotating drum on the round tube, the threaded groove rotates within the threaded protrusion. At this time, because the second cylinder is limited by the first limiting groove, the protrusion, and the first rubber pad, the second cylinder will not rotate with the threaded groove and the rotating drum. Instead, it will move towards the round tube under the rotational drive of the threaded groove, causing the other connecting tube to disengage from the second connecting groove and no longer abut against the third rubber pad. This allows the second cylinder to retract into the rotating drum. Then, by controlling the round tube to move towards the other connecting tube, one of the connecting tubes disengages from the first connecting groove and no longer abuts against the first rubber pad. This allows the old filter screen to be removed and replaced with a new one, facilitating replacement of the old filter screen after a period of use.

[0008] Preferably, a limiting rod is fixed to the outer wall of one of the connecting pipes, and a second limiting groove adapted to the limiting rod is formed on the inner wall of the first connecting groove. By fixing the limiting rod to the outer wall of one of the connecting pipes and forming a second limiting groove adapted to the limiting rod on the inner wall of the first connecting groove, the limiting rod and the second limiting groove facilitate the operator in keeping the round pipe and one of the connecting pipes relatively fixed.

[0009] Preferably, a plurality of protrusions are provided on the outer side wall of the first cylinder, and the plurality of protrusions are equidistantly distributed along the circumference of the first cylinder. By providing a plurality of protrusions on the outer side wall of the first cylinder and equidistantly distributed along the circumference of the first cylinder, the stability of the device during use can be improved.

[0010] Preferably, the second inlet pipe and the second outlet pipe are connected to the heat pump unit via a first three-way valve and a second three-way valve, respectively. A third inlet pipe is installed on the first three-way valve, and a third outlet pipe is installed on the second three-way valve. Both the end of the third inlet pipe furthest from the first three-way valve and the end of the third outlet pipe furthest from the second three-way valve are connected to the cooling tower. By connecting the second inlet pipe and the second outlet pipe to the heat pump unit via the first and second three-way valves, respectively, and ensuring that the cooling water continues to operate normally in the event of a malfunction in the heat pump unit, the device can maintain normal operation of the cooling water supply by controlling the opening of the first and second three-way valves during operation.

[0011] Preferably, the heat exchange device is a plate heat exchanger. By using a plate heat exchanger, heat exchange between the heat pump unit and power plant equipment can be facilitated.

[0012] The beneficial effects of this utility model are as follows: By setting up power plant equipment, heat exchange equipment, and a heat pump unit, the power plant equipment is connected to the heat exchange equipment through a first inlet pipe and a first outlet pipe, and the heat exchange equipment is connected to the heat pump unit through a second inlet pipe and a second outlet pipe. The first inlet pipe includes two connecting pipes that are respectively connected to the output end of the power plant equipment and the heat exchange equipment. A filter mechanism connected to the connecting pipe is provided between the two connecting pipes. When the device is in use, the cooling water of the power plant equipment enters the heat exchange equipment through the first inlet pipe, thereby facilitating heat exchange. The equipment transfers heat from the cooling water to the recycled circulating water, and sends the recycled circulating water into the heat pump unit through the second inlet pipe. This recovers heat from the cooling water in the power plant equipment. The cooled water after heat exchange returns to the power plant equipment through the first outlet pipe, and the recycled circulating water returns to the heat exchange equipment through the second outlet pipe. During the process of the cooling water entering the heat exchange equipment through the first inlet pipe, it passes through the connecting pipe and the filter mechanism to filter impurities in the cooling water, preventing impurities from entering the heat exchange equipment and causing blockage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of part A in the middle;

[0015] Figure 3 for Figure 2 Structural perspective view;

[0016] Figure 4 for Figure 3 Schematic diagram of Part B in the middle section;

[0017] Figure 5 for Figure 3 Schematic diagram of the structure of part C;

[0018] Figure 6 for Figure 3 Sectional view of the structure 'aa' in the middle;

[0019] Figure 7 for Figure 6 Schematic diagram of the structure of part D in the middle;

[0020] As shown in the figure:

[0021] 1. Power plant equipment; 2. Connecting pipe; 3. First outlet pipe; 4. Plate heat exchanger; 5. Second outlet pipe; 6. Second three-way valve; 7. Heat pump unit; 8. Third outlet pipe; 9. Cooling tower; 10. Second inlet pipe; 11. First three-way valve; 12. Third inlet pipe; 13. Round pipe; 14. Second cylinder; 15. Rotary drum; 16. First rubber pad; 17. Second limiting groove; 18. First connecting groove; 19. Limiting rod; 20. Filter screen; 21. Threaded groove; 22. Threaded protrusion; 23. First cylinder; 24. Protrusion; 25. Second rubber pad; 26. Third rubber pad; 27. Second connecting groove; 28. First limiting groove. Detailed Implementation

[0022] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0023] like Figures 1-7 The power plant cooling water heat recovery system of this utility model includes a power plant device 1, a heat exchange device and a heat pump unit 7. The power plant device 1 is connected to the heat exchange device through a first inlet pipe and a first outlet pipe 3. The heat exchange device is connected to the heat pump unit 7 through a second inlet pipe 10 and a second outlet pipe 5. The first inlet pipe includes two connecting pipes 2 that are respectively connected to the output end of the power plant device 1 and the heat exchange device, and a filter mechanism disposed between the two connecting pipes 2 and connected to the connecting pipes 2.

[0024] The filtration mechanism includes a circular tube 13 disposed at one end of a connecting pipe 2. A first connecting groove 18 is formed on one end face of the circular tube 13, and a first rubber pad 16 is fixedly connected to the bottom of the first connecting groove 18. One end of the connecting pipe 2 is located within the first connecting groove 18 and abuts against the first rubber pad 16. A rotating cylinder 15 is coaxially disposed on the other end face of the circular tube 13, and a first cylinder 23 located within the rotating cylinder 15 is coaxially fixedly connected to the other end face of the circular tube 13. A protrusion 24 is fixedly connected to the outer wall of the first cylinder 23. A second [unclear - possibly a type of support structure] is disposed between the rotating cylinder 15 and the first cylinder 23, fitting against the protrusion 24 and the outer wall of the first cylinder 23. A second cylinder 14, coaxial with the circular tube 13, is provided between the rubber pad 25, the rotating cylinder 15, and the second rubber pad 25. A first limiting groove 28, adapted to the second rubber pad 25, is provided on the inner wall of the second cylinder 14. A threaded groove 21 is provided on the inner wall of the rotating cylinder 15. A threaded protrusion 22, screwed into the threaded groove 21, is provided on the outer wall of the second cylinder 14. A second connecting groove 27 is provided on the end face of the second cylinder 14 away from one of the connecting tubes 2. A third rubber pad 26 is fixedly connected to the bottom of the second connecting groove 27. The end of the other connecting tube 2 is located within the second connecting groove 27 and connected to the third rubber pad 26. A filter screen 20 is sealed and fixed to the inner wall of the circular tube 13. When the device is in use, if the operator wants to replace the filter screen 20 after prolonged use, it is necessary to simultaneously control the circular tube 13 and one of the connecting pipes 2 to keep them relatively fixed. Then, by controlling the rotating drum 15 to rotate on the circular tube 13, the threaded groove 21 rotates within the threaded protrusion 22 along with the rotating drum 15. At this time, because the second cylinder 14 is limited by the first limiting groove 28, the protrusion 24, and the first rubber pad 16, the second cylinder 14 will not rotate with the threaded groove 21 and the rotating drum 13. Instead of rotating, the cylinder 14 moves towards the circular tube 13 under the rotational drive of the threaded groove 21, causing the other connecting tube 2 to disengage from the second connecting groove 27 and no longer abut against the third rubber pad 26. This causes the second cylinder 14 to retract into the rotating cylinder 15. Then, by controlling the circular tube 13 to move towards the other connecting tube 2, one of the connecting tubes 2 disengages from the first connecting groove 18 and no longer abuts against the first rubber pad 16. This allows the old filter screen 20 to be removed and replaced with a new one, making it easier for workers to replace the old filter screen 20 after a period of use. A limiting rod 19 is fixed to the outer wall of one of the connecting tubes 2, and a second limiting groove 17 adapted to the limiting rod 19 is provided on the inner wall of the first connecting groove 18. The limiting rod 19 and the second limiting groove 17 allow workers to easily keep the circular tube 13 and one of the connecting tubes 2 relatively fixed. By providing a plurality of protrusions 24 on the outer side wall of the first cylinder 23, and distributing the plurality of protrusions 24 at equal intervals along the circumference of the first cylinder 23, the stability of the device during use can be improved.By connecting the second inlet pipe 10 and the second outlet pipe 5 to the heat pump unit 7 via the first three-way valve 11 and the second three-way valve 6 respectively, and by installing a third inlet pipe 12 on the first three-way valve 11 and a third outlet pipe 8 on the second three-way valve 6, both the end of the third inlet pipe 12 away from the first three-way valve 11 and the end of the third outlet pipe 8 away from the second three-way valve 6 are connected to the cooling tower 9. During operation, by controlling the opening of the first three-way valve 11 and the second three-way valve 6, the system can maintain normal operation of the cooling water in the event of an accident involving the heat pump unit 7. By setting the heat exchange equipment as a plate heat exchanger 4, heat exchange between the heat pump unit 7 and the power plant equipment 1 can be easily facilitated.

[0025] Combined with appendix Figure 1-7 The method of using this utility model is as follows: First, the cooling water of the power plant equipment 1 enters the plate heat exchanger 4 through the first inlet pipe, so that the plate heat exchanger 4 transfers the heat in the cooling water to the recycled circulating water. The recycled circulating water is then sent into the heat pump unit 7 through the second inlet pipe 10, thereby recovering the heat of the cooling water in the power plant equipment 1. The cooled water after heat exchange returns to the power plant equipment 1 through the first outlet pipe 3, and the recycled circulating water after heat exchange returns to the plate heat exchanger 4 through the second outlet pipe 5. As the tube enters the plate heat exchanger 4, it passes through connecting pipe 2, circular pipe 13, first cylinder 23, and filter screen 20 to filter impurities in the cooling water, preventing them from entering the plate heat exchanger 4 and causing blockage. If the filter screen 20 needs to be replaced after prolonged use, the circular pipe 13 and one of the connecting pipes 2 must be controlled simultaneously to keep them relatively fixed. Then, the rotating cylinder 15 is controlled to rotate on the circular pipe 13, causing the threaded groove 21 to rotate with it. The cylinder 15 rotates within the threaded protrusion 22. At this time, because the second cylinder 14 is limited by the first limiting groove 28, the protrusion 24, and the first rubber pad 16, the second cylinder 14 will not rotate with the threaded groove 21 and the rotating cylinder 15. Instead, it will move towards the circular tube 13 under the rotational drive of the threaded groove 21, thereby causing the other connecting tube 2 to disengage from the second connecting groove 27 and no longer abut against the third rubber pad 26. This allows the second cylinder 14 to retract into the rotating cylinder 15. Then, by controlling the circular tube 13 to move towards the other connecting tube 2... The device moves so that one of the connecting pipes 2 is disengaged from the first connecting groove 18 and no longer abuts against the first rubber pad 16, thereby removing the old filter screen 20 and replacing it with a new one. This not only facilitates the filtration of impurities in the cooling water of the power plant equipment 1, but also makes it convenient for staff to replace the old filter screen 20 after a period of use. When the device is in use, the first three-way valve 11 and the second three-way valve 6 are opened by controlling them, which can maintain the normal operation of the cooling water in the event of an accident in the heat pump unit 7.

[0026] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A power plant cooling water heat recovery system, characterized in that: The device includes power plant equipment (1), heat exchange equipment and heat pump unit (7). The power plant equipment is connected to the heat exchange equipment through a first inlet pipe and a first outlet pipe (3). The heat exchange equipment is connected to the heat pump unit through a second inlet pipe (10) and a second outlet pipe (5). The first inlet pipe includes two connecting pipes (2) that are respectively connected to the output end of the power plant equipment and the heat exchange equipment, and a filter mechanism that is disposed between the two connecting pipes and connected to the connecting pipes.

2. The power plant cooling water heat recovery system according to claim 1, characterized in that: The filtration mechanism includes a circular tube (13) disposed at one end of a connecting tube. A first connecting groove (18) is formed on one end face of the circular tube. A first rubber pad (16) is fixedly connected to the bottom of the first connecting groove. One end of the connecting tube is located in the first connecting groove and abuts against the first rubber pad. A rotating cylinder (15) is coaxially disposed on the other end face of the circular tube. A first cylinder (23) located inside the rotating cylinder is coaxially fixedly connected to the other end face of the circular tube. A protrusion (24) is fixedly connected to the outer wall of the first cylinder. A second rubber pad (25) is disposed between the rotating cylinder and the first cylinder, which fits against the protrusion and the outer wall of the first cylinder. A second cylinder (14) coaxial with the round tube is provided between the second rubber pad and the second cylinder. A first limiting groove (28) adapted to the second rubber pad is provided on the inner side wall of the second cylinder. A threaded groove (21) is provided on the inner side wall of the rotating cylinder. A threaded protrusion (22) screwed into the threaded groove is provided on the outer side wall of the second cylinder. A second connecting groove (27) is provided on the end face of the second cylinder away from one of the connecting pipes. A third rubber pad (26) is fixedly connected to the bottom of the second connecting groove. The end of the other connecting pipe is located in the second connecting groove and abuts against the third rubber pad. A filter screen (20) is sealed and fixedly connected to the inner side wall of the round tube.

3. The power plant cooling water heat recovery system according to claim 2, characterized in that: A limiting rod (19) is fixedly attached to the outer side wall of one of the connecting pipes, and a second limiting groove (17) adapted to the limiting rod is provided on the inner side wall of the first connecting groove.

4. The power plant cooling water heat recovery system according to claim 2, characterized in that: Several protrusions are provided on the outer side wall of the first cylinder, and the several protrusions are equidistantly distributed along the circumference of the first cylinder.

5. The power plant cooling water heat recovery system according to claim 4, characterized in that: The second inlet pipe and the second outlet pipe are connected to the heat pump unit through the first three-way valve (11) and the second three-way valve (6), respectively. The first three-way valve is equipped with a third inlet pipe (12), and the second three-way valve is equipped with a third outlet pipe (8). The end of the third inlet pipe away from the first three-way valve and the end of the third outlet pipe away from the second three-way valve are both connected to the cooling tower (9).

6. The power plant cooling water heat recovery system according to claim 4, characterized in that: The heat exchange equipment is configured as a plate heat exchanger (4).

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