A combined cooling device for nuclear power emergency diesel generator sets

Abstract

This invention relates to a combined cooling device for nuclear power emergency diesel generator sets. The combined cooling device includes a base plate with three interconnected lubricating oil channels: a first lubricating oil channel, a second lubricating oil channel, and a third lubricating oil channel. A first heat exchanger is located at the upper end of the base plate, and has a second heat exchange inlet and a second heat exchange outlet. The first heat exchanger also has a third heat exchange inlet and a third heat exchange outlet. A cooling plate is located above the first heat exchanger, and has six low-temperature water channels: a first low-temperature water channel, a second low-temperature water channel, a third low-temperature water channel, a fourth low-temperature water channel, a fifth low-temperature water channel, and a sixth low-temperature water channel. In use, the combined cooling device for nuclear power emergency diesel generator sets of this invention exchanges heat between low-temperature water and lubricating oil through the first heat exchanger. Since both the first heat exchanger and the cooling plate are integrated into the base plate, the number of connecting pipes is reduced, facilitating installation and lowering manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of liquid cooling technology, and more particularly to a combined cooling device for nuclear power emergency diesel generator sets. Background Technology

[0002] As the sole emergency power source when a nuclear power plant loses its main operating power, emergency diesel generator sets are of paramount importance. Their function is to provide medium-voltage emergency AC power to the nuclear power plant when the external AC power system fails, ensuring safe reactor shutdown and preventing accidents. Oil / cryogenic water heat exchangers are essential auxiliary equipment for nuclear power emergency diesel generator sets. Traditional heat exchangers are of two types: plate and tubular. Both operate on the principle of single-medium heat exchange, with simple structures and limited functions. When used as auxiliary equipment for diesel generator sets, they also require thermostatic valves, orifice plates, and connecting pipes to achieve effective heat exchange between the unit's oil and cooling water. Therefore, designing a composite heat exchanger for use in conjunction with the diesel generator set helps improve unit integration and installation convenience, while reducing the manufacturing cost of the complete equipment. Summary of the Invention

[0003] This invention provides a combined cooling device for nuclear power emergency diesel generator sets to solve the technical problem of low integration of existing diesel generator set cooling devices.

[0004] To solve the above problems, the present invention provides a combined cooling device for nuclear power emergency diesel generator sets, which adopts the following technical solution: It includes a base plate mounted on the diesel generator set. The base plate has a first lubricating oil channel, a second lubricating oil channel, and a third lubricating oil channel that converge at the same location. At the convergence point, a lubricating oil thermostatic valve is provided that connects any two of the three lubricating oil channels. The first lubricating oil channel has an oil inlet at its end furthest from the thermostatic valve for transporting low-temperature lubricating oil into the diesel generator set. The second lubricating oil channel has an oil outlet at its end furthest from the thermostatic valve for outputting lubricating oil from the diesel generator set. The second lubricating oil channel also has a first heat exchange inlet, and the third lubricating oil channel has a first heat exchange outlet at its end furthest from the thermostatic valve.

[0005] A first heat exchanger is located on the upper part of the base plate. The first heat exchanger has a second heat exchange inlet and a second heat exchange outlet. The second heat exchange outlet is connected to the first heat exchange inlet, and the second heat exchange inlet is connected to the first heat exchange outlet. High-temperature lubricating oil flows sequentially through the first heat exchange inlet, the second heat exchange outlet, the second heat exchange inlet, and the first heat exchange outlet before entering the first lubricating oil channel and flowing towards the lubricating oil inlet. The first heat exchanger also has a third heat exchange inlet and a third heat exchange outlet.

[0006] A fuel plate is located at the upper end of the first heat exchanger. The fuel plate has a first fuel inlet and a first fuel outlet. It also has a fourth heat exchange inlet that corresponds to and is connected to the third heat exchange inlet and a fourth heat exchange outlet that corresponds to and is connected to the third heat exchange outlet. The fuel plate also has a first fuel passage that is connected to the first fuel inlet and is used to discharge fuel from the diesel generator set. The fuel plate also has a second fuel passage that is connected to the first fuel outlet and is used to transport cooled fuel to the fuel tank of the diesel generator set.

[0007] The second heat exchanger is located above the fuel plate. The second heat exchanger has a fifth heat exchange inlet that corresponds to and is connected to the first fuel inlet, a fifth heat exchange outlet that corresponds to and is connected to the first fuel outlet, a sixth heat exchange inlet that corresponds to and is connected to the fourth heat exchange inlet, and a sixth heat exchange outlet that corresponds to and is connected to the fourth heat exchange outlet.

[0008] A cooling plate, positioned above the second heat exchanger, has six low-temperature water channels: a first, a second, a third, a fourth, a fifth, and a sixth. One end of the first low-temperature water channel is connected to a low-temperature water thermostatic valve, and the other end has a first low-temperature water inlet for supplying low-temperature water to the diesel generator set. One end of the second low-temperature water channel has a first low-temperature water outlet for outputting low-temperature water from the diesel generator set, and the other end is connected to the sixth heat exchanger inlet. One end of the third low-temperature water channel is connected to the sixth heat exchanger outlet. One end of the fourth low-temperature water channel has a... The diesel generator set outputs low-temperature water through a second low-temperature water outlet; one end of the fifth low-temperature water channel is connected to the low-temperature water thermostatic valve, and the other end is provided with a first low-temperature water inlet for conveying low-temperature water into the cooling plate; one end of the sixth low-temperature water channel is provided with a first low-temperature water outlet for discharging high-temperature water from the cooling plate, and the other end of the sixth low-temperature water channel is connected to the end of the fourth low-temperature water channel away from the second low-temperature water outlet and the end of the third low-temperature water channel away from the third heat exchange outlet, and the connection position of the sixth low-temperature water channel with the fourth low-temperature water channel and the third low-temperature water channel is connected to the low-temperature water thermostatic valve.

[0009] The beneficial effects are as follows: In the operation of the combined cooling device for a nuclear power emergency diesel generator set, lubricating oil first enters the diesel generator set through the lubricating oil inlet. After completing one flow path, the lubricating oil flows into the second lubricating oil channel through the lubricating oil outlet. Within the second lubricating oil channel, the lubricating oil flows to the lubricating oil thermostatic valve. When the lubricating oil temperature meets the requirements, it flows through the thermostatic valve into the first lubricating oil channel and finally back into the diesel generator set through the lubricating oil inlet. However, when the lubricating oil temperature is too high, it flows along the first heat exchange inlet into the second heat exchange outlet, thus entering the first heat exchanger for heat exchange, thereby lowering the lubricating oil temperature. Finally, the lubricating oil flows along the second heat exchange outlet into the second heat exchange inlet, then back into the first heat exchange outlet, and finally into the third lubricating oil channel and to the lubricating oil thermostatic valve. At this point, the lubricating oil temperature has decreased and it can flow through the thermostatic valve into the first lubricating oil channel. Low-temperature water enters the fifth low-temperature water channel through the first low-temperature water inlet, and then passes through the low-temperature water thermostatic valve into the first low-temperature water channel. The low-temperature water enters the diesel generator set through the first low-temperature water inlet. After passing through the generator set, it is simultaneously split to the first and second low-temperature water outlets. The low-temperature water flows into the fourth low-temperature water channel through the second low-temperature water outlet. The low-temperature water then flows into the second low-temperature water channel through the first low-temperature water outlet and then into the first heat exchanger for heat exchange. After heat exchange, the low-temperature water mixes with the low-temperature water in the third and fourth low-temperature water channels. When the mixed low-temperature water meets the set requirements, it can flow into the first low-temperature water channel through the low-temperature water thermostatic valve. When the temperature of the mixed low-temperature water is too high, the low-temperature water cannot pass through the low-temperature water thermostatic valve and is discharged through the sixth low-temperature water channel. Fuel flows into the fuel plate through the first fuel channel, then into the fifth heat exchange inlet through the first fuel inlet. It also exchanges heat with the low-temperature water in the second heat exchanger and then flows out through the fifth heat exchange outlet. Finally, it flows into the second fuel channel through the first fuel outlet and then out into the fuel tank of the diesel generator set. The combined cooling device for nuclear power emergency diesel generator sets of the present invention, in use, allows cryogenic water and lubricating oil to exchange heat through a first heat exchanger, and cryogenic water and fuel oil to exchange heat through a second heat exchanger. Simultaneously, the first heat exchanger, the second heat exchanger, the cooling plate, and the fuel plate are all integrated on the base plate, thereby reducing the need for connecting pipes. The compact structure and integrated design reduce the layout and installation of external auxiliary equipment and nuclear-grade piping. Cryogenic water thermostatic valves and lubricating oil thermostatic valves are located on the base plate and the cooling plate, respectively, with their connected cast-body channels replacing lengthy external seamless pipes. The integrated function and compact structure reduce the layout of plant piping and lower system piping heat loss.

[0010] Furthermore, a radiator is provided between the first low-temperature water inlet and the first low-temperature water outlet, and the low-temperature water flows into the radiator along the first low-temperature water outlet and into the cooling plate along the first low-temperature water inlet.

[0011] Beneficial effects: It ensures the recycling of low-temperature water, improves water resource utilization, and helps protect the environment.

[0012] Furthermore, the radiator is an air-cooled heat dissipation device.

[0013] Beneficial effects: easy to maintain, inexpensive, low energy consumption, and reduced costs.

[0014] Furthermore, a throttling plug is provided at the end of the third low-temperature water channel that connects to the fourth and sixth low-temperature water channels; a throttling plug is also provided at the end of the fourth low-temperature water channel that connects to the third and sixth low-temperature water channels.

[0015] Beneficial effects: It facilitates the control of the volume of low-temperature water flowing out of the third and fourth low-temperature water channels, thereby making it easier to adjust the temperature of the mixed low-temperature water flowing out of the third and fourth low-temperature water channels, and thus ensuring that the low-temperature water flowing out of the third and fourth low-temperature water channels can pass through the low-temperature water thermostatic valve.

[0016] Furthermore, the second cryogenic water outlet is connected to the air cooler on the diesel generator set.

[0017] Beneficial effect: It cools the gas inside the air cooler, thereby preventing the gas entering the diesel generator set from being too hot and causing accidents.

[0018] Furthermore, the cooling plate includes an upper plate segment and a lower plate segment. The fourth low-temperature water channel, the fifth low-temperature water channel, the first high-temperature water channel, the third high-temperature water channel, and the fourth high-temperature water channel are all located on the upper plate segment; the first low-temperature water channel, the second low-temperature water channel, and the third low-temperature water channel are located on the lower plate segment; and the sixth low-temperature water channel, the second high-temperature water channel, and the high-temperature water merging channel all penetrate through the upper plate segment and the lower plate segment.

[0019] Beneficial effects: The rational layout reduces the space occupied by the cooling plate and facilitates installation.

[0020] Furthermore, both the cooling plate and the base plate are formed by casting, and each channel within the cooling plate and the base plate is a cast cavity.

[0021] Beneficial effects: It is easy to manufacture, has a stable structure, and replaces traditional pipe designs, greatly reducing the use of external pipes.

[0022] Furthermore, both the first and second heat exchangers are plate heat exchangers, and the plates of both the first and second heat exchangers are made of stainless steel.

[0023] Beneficial effects: Plate heat exchangers have high heat exchange efficiency and low heat loss, resulting in a compact structure and small size, which facilitates maintenance and provides high flexibility. At the same time, the stainless steel material can effectively prevent corrosion caused by the medium.

[0024] Furthermore, the cooling plate has multiple first connecting holes, the base has second connecting holes corresponding to the first connecting holes, the first heat exchanger has third connecting holes corresponding to the first connecting holes, the second heat exchanger has fourth connecting holes corresponding to the third connecting holes, and the fuel plate has multiple fifth connecting holes corresponding to the fourth connecting holes. The cooling plate, the base, the first heat exchanger, the second heat exchanger, and the fuel plate are connected together by clamping bolts passing through the first connecting holes, the second connecting holes, the third connecting holes, the fourth connecting holes, and the fifth connecting holes.

[0025] Beneficial effects: Simple structure and easy to fix. Attached Figure Description

[0026] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0027] Figure 1 This is a schematic diagram of the combined cooling device for nuclear power emergency diesel generator sets according to the present invention;

[0028] Figure 2 This is a schematic diagram of the cooling plate of the present invention;

[0029] Figure 3 This is a cross-sectional view of the cooling plate of the present invention;

[0030] Figure 4 This is a schematic diagram of the high-temperature water circulation principle of the present invention;

[0031] Figure 5 This is a cross-sectional view of the cooling plate of the present invention;

[0032] Figure 6 This is a schematic diagram of the low-temperature water circulation principle of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the base plate of the present invention;

[0034] Figure 8 This is a cross-sectional view of the base plate of the present invention;

[0035] Figure 9 This is a schematic diagram of the lubricating oil circulation principle of the present invention;

[0036] Figure 10 This is a schematic diagram of the structure of the first heat exchanger of the present invention;

[0037] Figure 11 This is a schematic diagram of the fuel plate structure of the present invention;

[0038] Figure 12 This is a cross-sectional view of the fuel plate of the present invention;

[0039] Figure 13 This is a schematic diagram of the structure of the second heat exchanger of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Base plate; 2. First heat exchanger; 3. Cooling plate; 4. First lubricating oil passage; 5. Second lubricating oil passage; 6. Third lubricating oil passage; 7. Lubricating oil thermostatic valve; 8. Lubricating oil inlet; 9. Lubricating oil outlet; 10. First heat exchange inlet; 11. First heat exchange outlet; 12. Second heat exchange inlet; 13. Second heat exchange outlet; 14. Third heat exchange inlet; 15. Third heat exchange outlet; 16. First low-temperature water passage; 17. Second low-temperature water passage; 18. Third low-temperature water passage; 19. Fourth low-temperature water passage; 20. Fifth low-temperature water passage; 21. Sixth low-temperature water passage; 22. Low-temperature water thermostatic valve; 23. First low-temperature water inlet; 24. First low-temperature water outlet; 25. Second low-temperature water outlet 26. First low-temperature water inlet; 27. First low-temperature water outlet; 28. Radiator; 29. ​​Throttling plug; 30. Air cooler; 31. First high-temperature water channel; 32. Second high-temperature water channel; 33. Third high-temperature water channel; 34. Fourth high-temperature water channel; 35. High-temperature water merging channel; 36. High-temperature water thermostatic valve; 37. Clamping bolt; 38. First fuel oil inlet; 39. First fuel oil outlet; 40. Fourth heat exchange outlet; 41. Fourth heat exchange inlet; 42. First fuel oil channel; 43. Second fuel oil channel; 44. Fifth heat exchange inlet; 45. Fifth heat exchange outlet; 46. Sixth heat exchange inlet; 47. Sixth heat exchange outlet; 48. Second heat exchanger; 49. Fuel oil plate. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0044] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0045] Embodiment 1 of a combined cooling device for nuclear power emergency diesel generator sets provided by the present invention:

[0046] like Figures 1 to 10 As shown, a combined cooling device for a nuclear power emergency diesel generator set according to the present invention includes: a base plate 1, a first heat exchanger 2, a fuel plate, a second heat exchanger, and a cooling plate 3.

[0047] The base plate 1 has fixing holes with universal ball bearings inside, facilitating the movement of the base plate 1 onto or off the common base of the diesel generator set. Multiple second connection holes are also provided on the circumference of the base 1. For example... Figure 7 , Figure 8 and Figure 9 The base plate 1 has a first lubricating oil channel 4, a second lubricating oil channel 5, and a third lubricating oil channel 6 connected together. A lubricating oil thermostatic valve 7 is provided at the connection position of the first lubricating oil channel 4, the second lubricating oil channel 5, and the third lubricating oil channel 6. The end of the first lubricating oil channel 4 away from the lubricating oil thermostatic valve 7 is provided with a lubricating oil inlet 8 for transporting low-temperature lubricating oil to the diesel generator set. The end of the second lubricating oil channel 5 away from the lubricating oil thermostatic valve 7 is provided with a lubricating oil outlet 9 for outputting lubricating oil from the diesel generator set. The second lubricating oil channel 5 is also provided with a first heat exchange inlet 10. The end of the third lubricating oil channel 6 away from the lubricating oil thermostatic valve 7 is provided with a first heat exchange outlet 11.

[0048] like Figure 1 As shown, the first heat exchanger 2 is located on the upper end of the base plate 1. Multiple third connection holes, each corresponding to a second connection hole, are formed on the circumference of the first heat exchanger 2. Each third connection hole corresponds to one of the second connection holes. For example... Figure 10 As shown, the first heat exchanger 2 is provided with a second heat exchange inlet 12 and a second heat exchange outlet 13. The second heat exchange outlet 13 is connected to the first heat exchange inlet 10, and the second heat exchange inlet 12 is connected to the first heat exchange outlet 11. The high-temperature lubricating oil flows sequentially through the first heat exchange inlet 10, the second heat exchange outlet 13, the second heat exchange inlet 12, and the first heat exchange outlet 11 before entering the first lubricating oil channel 4 and flowing to the lubricating oil inlet 8. The first heat exchanger 2 is also provided with a third heat exchange inlet 14 and a third heat exchange outlet 15.

[0049] The first heat exchanger 2 is a plate heat exchanger, and the plates of the first heat exchanger 2 are made of stainless steel.

[0050] A fuel plate 49 is located at the upper end of the first heat exchanger, and multiple fifth connection holes, each corresponding to a second connection hole, are formed on the circumference of the fuel plate 49. For example... Figure 11 and Figure 12As shown, the fuel plate 49 has a first fuel inlet 38 and a first fuel outlet 39. The fuel plate 49 also has a first fuel passage 42 connected to the first fuel inlet 38 for discharging fuel from the diesel generator set. The fuel plate 49 also has a second fuel passage 43 connected to the first fuel outlet 39 for transporting cooled fuel to the fuel tank of the diesel generator set. The fuel plate 49 also has a fourth heat exchange inlet 41 corresponding to and connected to the third heat exchange inlet, and a fourth heat exchange outlet 40 corresponding to and connected to the third heat exchange outlet.

[0051] The second heat exchanger 48 is located above the fuel plate 49, and multiple fourth connection holes, each corresponding to a second connection hole, are formed on the circumference of the second heat exchanger 48. For example... Figure 13 As shown, the second heat exchanger 48 is provided with a fifth heat exchange inlet 44 that corresponds to and communicates with the first fuel oil inlet 38, a fifth heat exchange outlet 45 that corresponds to and communicates with the first fuel oil outlet 39, a sixth heat exchange inlet 46 that corresponds to and communicates with the fourth heat exchange inlet 41, and a sixth heat exchange outlet 47 that corresponds to and communicates with the fourth heat exchange outlet 40.

[0052] The cooling plate 3 has multiple first connecting holes on its circumference that correspond one-to-one with the second connecting holes. Each first connecting hole is set one-to-one with each second connecting hole. The cooling plate 3, the base 1, the first heat exchanger 2, the second heat exchanger 48 and the fuel plate 49 are connected together by clamping bolts 37 that pass through the corresponding first connecting holes, second connecting holes, third connecting holes, fourth connecting holes and fifth connecting holes.

[0053] Cooling plate 3 includes an upper plate segment and a lower plate segment. For example... Figure 1 As shown, the cooling plate 3 is located above the first heat exchanger 2, and the cooling plate 3 has a first low-temperature water channel 16, a second low-temperature water channel 17, a third low-temperature water channel 18, a fourth low-temperature water channel 19, a fifth low-temperature water channel 20, and a sixth low-temperature water channel 21. Figure 2 , Figure 3 , Figure 5 , Figure 6As shown, one end of the first low-temperature water channel 16 is connected to a low-temperature water thermostatic valve 22, and the other end is provided with a first low-temperature water inlet 23 for supplying low-temperature water to the diesel generator set; one end of the second low-temperature water channel 17 is provided with a first low-temperature water outlet 24 for outputting low-temperature water from the diesel generator set, and the other end is connected to the sixth heat exchange inlet 46; one end of the third low-temperature water channel 18 is connected to the sixth heat exchange outlet 47; one end of the fourth low-temperature water channel 19 is provided with a second low-temperature water outlet 25 for outputting low-temperature water from the diesel generator set, and the second low-temperature water outlet 25 is connected to the air cooler 30 of the diesel generator set, thereby cooling the gas required by the diesel generator set; one end of the fifth low-temperature water channel 20 is connected to the low-temperature water thermostatic valve 22, and the other end is provided with a valve for supplying low-temperature water to the cooling plate 3. The system includes a first low-temperature water inlet 26 for supplying low-temperature water; a first low-temperature water outlet 27 for discharging excessively hot water from the cooling plate 3 at one end of the sixth low-temperature water channel 21; the other end of the sixth low-temperature water channel 21 is connected to the end of the fourth low-temperature water channel 19 away from the second low-temperature water outlet 25 and the end of the third low-temperature water channel 18 away from the third heat exchange outlet 15; and the connection point of the sixth low-temperature water channel 21, the fourth low-temperature water channel 19, and the third low-temperature water channel 18 is connected to the low-temperature water thermostatic valve 22. A radiator 28 is also provided between the first low-temperature water inlet 26 and the first low-temperature water outlet 27. Low-temperature water flows into the radiator 28 along the first low-temperature water outlet 27 and then into the cooling plate 3 along the first low-temperature water inlet 26. The radiator 28 is an air-cooled radiator.

[0054] In this embodiment, a cryogenic water pump is connected to the first cryogenic water inlet 23, which diverts cryogenic water to the air cooler 30 and the second cryogenic water outlet 25.

[0055] To facilitate the control of the flow rate from the third low-temperature water channel 18 and the fourth low-temperature water channel 19 to the low-temperature water thermostatic valve 22, a throttling plug 29 is provided at the end of the third low-temperature water channel 18 that connects to the fourth low-temperature water channel 19 and the sixth low-temperature water channel 21; a throttling plug 29 is also provided at the end of the fourth low-temperature water channel 19 that connects to the third low-temperature water channel 18 and the sixth low-temperature water channel 21.

[0056] The cooling plate 3 is also equipped with a first high-temperature water channel 31, a second high-temperature water channel 32, a third high-temperature water channel 33, a fourth high-temperature water channel 34, a high-temperature water merging channel 35, and a high-temperature water thermostatic valve 36. For example... Figure 3 and Figure 4As shown, the first high-temperature water channel 31 and the second high-temperature water channel 32 are both connected to the high-temperature water merging channel 35. The high-temperature water merging channel 35, the third high-temperature water channel 33, and the fourth high-temperature water channel 34 are all connected to the high-temperature water thermostatic valve 36. The first high-temperature water channel 31 is used to supply high-temperature water to the cooling plate 3; the second high-temperature water channel 32 is used to supply water from the first high-temperature water channel 31 and the high-temperature water merging channel 35 to the diesel generator set; the third high-temperature water channel 33 is used to supply water circulated in the diesel generator set to the high-temperature water thermostatic valve 36. When the water temperature is within the set range, the high-temperature water flows into the second high-temperature water channel 32 along the high-temperature water thermostatic valve 36, and then flows into the diesel generator set; when the water temperature is outside the set range, the high-temperature water flows into the fourth high-temperature water channel 34 along the high-temperature water thermostatic valve 36, and then flows out to the cooling device, which is an air-cooled radiator. After the high-temperature water temperature reaches the set range, it flows into the first high-temperature water channel 31, then into the second high-temperature water channel 32, and finally into the diesel generator set.

[0057] The fourth low-temperature water channel 19, the fifth low-temperature water channel 20, the first high-temperature water channel 31, the third high-temperature water channel 33, and the fourth high-temperature water channel 34 are all located on the upper plate section; the first low-temperature water channel 16, the second low-temperature water channel 17, and the third low-temperature water channel 18 are located on the lower plate section; the sixth low-temperature water channel 21, the second high-temperature water channel 32, and the high-temperature water merging channel 35 all penetrate the upper plate section and the lower plate section.

[0058] In this embodiment, both the cooling plate 3 and the base plate 1 are made of cast cavity, thereby reducing the need for external piping and facilitating manufacturing and installation. Sealing strips are provided along the edges of the second heat exchange inlet 12, the second heat exchange outlet 13, the third heat exchange inlet 14, and the third heat exchange outlet 15 to prevent leakage of low-temperature water or lubricating oil. Furthermore, the number of plates in the first heat exchanger 2 and the second heat exchanger 48 can be flexibly increased or decreased, enhancing the compatibility of this invention with diesel engines of different power and heat exchange requirements. Each channel is also equipped with a drain port, facilitating low-point discharge during oil and water changes.

[0059] In this embodiment, each channel has a sensor mounting hole, which facilitates the measurement of the thermal parameters of the medium in each channel, completely replacing the dispersed arrangement of sensors on external pipelines.

[0060] In the operation of the combined cooling device for a nuclear power emergency diesel generator set, lubricating oil first enters the diesel generator set through the lubricating oil inlet 8. After completing one flow path, the lubricating oil flows into the second lubricating oil channel 5 through the lubricating oil outlet 9. Within the second lubricating oil channel 5, the lubricating oil flows to the lubricating oil thermostatic valve 7. When the lubricating oil temperature meets the requirements, it flows through the lubricating oil thermostatic valve 7 into the first lubricating oil channel 4, and finally re-enters the diesel generator set through the lubricating oil inlet 8. Conversely, when the lubricating oil temperature is too high, it flows through the first heat exchange inlet 10 into the second heat exchange outlet 13, thus entering the... The first heat exchanger 2 exchanges heat, thereby reducing the temperature of the lubricating oil. Finally, the lubricating oil flows along the second heat exchange outlet 13 into the second heat exchange inlet 12, then along the second heat exchange inlet 12 into the first heat exchange outlet 11, and then into the third lubricating oil channel 6 and to the lubricating oil thermostatic valve 7. At this point, the lubricating oil temperature is reduced, allowing it to flow into the first lubricating oil channel 4 through the lubricating oil thermostatic valve 7. Low-temperature water enters the fifth low-temperature water channel 20 along the first low-temperature water inlet 26, then passes through the low-temperature water thermostatic valve 22 into the first low-temperature water channel 16. At this point, the low-temperature water flows along the first low-temperature... Water enters the diesel generator set through inlet 23 and is simultaneously diverted to the first low-temperature water outlet 24 and the air cooler 30. After being heated by the air cooler 30, the low-temperature water enters the second low-temperature water outlet 25 and then flows into the fourth low-temperature water channel 19. The low-temperature water flows along the first low-temperature water outlet 24 into the second low-temperature water channel 17, and then into the first heat exchanger 2 and the second heat exchanger 48 for heat exchange. The heat-exchanged low-temperature water mixes with the low-temperature water in the third low-temperature water channel 18 and the fourth low-temperature water channel 19. When the mixed low-temperature water meets the set requirements, it can flow... Low-temperature water thermostatic valve 22 flows into the first low-temperature water channel 16. When the temperature of the mixed low-temperature water is too high, the low-temperature water cannot pass through the low-temperature water thermostatic valve 22. At this time, the low-temperature water is discharged along the sixth low-temperature water channel 21. Fuel flows into the fuel plate 49 along the first fuel channel 42, and then flows into the fifth heat exchange inlet 44 through the first fuel inlet 38. At the same time, it exchanges heat with the low-temperature water through the second heat exchanger 48 and then flows out along the fifth heat exchange outlet 45. Finally, it flows into the second fuel channel 43 along the first fuel outlet 39, and then flows out into the fuel tank of the diesel generator set.

[0061] The combined cooling device for nuclear power emergency diesel generator sets of the present invention, in use, allows cryogenic water and lubricating oil to exchange heat through a first heat exchanger, and cryogenic water and fuel oil to exchange heat through a second heat exchanger. Simultaneously, the first heat exchanger, the second heat exchanger, the cooling plate, and the fuel plate are all integrated on the base plate, thereby reducing the need for connecting pipes. The compact structure and integrated design reduce the layout and installation of external auxiliary equipment and nuclear-grade piping. Cryogenic water thermostatic valves and lubricating oil thermostatic valves are located on the base plate and the cooling plate, respectively, with their connected cast-body channels replacing lengthy external seamless pipes. The integrated function and compact structure reduce the layout of plant piping and lower system piping heat loss.

[0062] Embodiment 2 of a combined cooling device for nuclear power emergency diesel generator sets provided by the present invention:

[0063] The main difference between it and Embodiment 1 is that in Embodiment 1, a radiator is also provided between the first low-temperature water inlet and the first low-temperature water outlet.

[0064] In this embodiment, a water tank storing low-temperature water can also be set at the outer end of the first low-temperature water inlet. When low-temperature water needs to be added, the low-temperature water in the water tank is transported to the fifth low-temperature water channel. When the low-temperature water collected in the third and fourth low-temperature water channels cannot pass through the low-temperature water thermostatic valve, this part of the low-temperature water can be discharged along the first low-temperature water outlet, while the low-temperature water in the water tank is input along the first low-temperature water inlet.

[0065] Embodiment 3 of a combined cooling device for nuclear power emergency diesel generator sets provided by the present invention:

[0066] The main difference between it and Embodiment 1 is that: in Embodiment 1, the end of the third low-temperature water channel that connects with the fourth low-temperature water channel and the sixth low-temperature water channel is also provided with a throttling plug; the end of the fourth low-temperature water channel that connects with the third low-temperature water channel and the sixth low-temperature water channel is also provided with a throttling plug.

[0067] In this embodiment, a ball valve or butterfly valve can also be installed at the end of the third low-temperature water channel that connects to the fourth low-temperature water channel and the sixth low-temperature water channel; a ball valve or butterfly valve can also be installed at the end of the fourth low-temperature water channel that connects to the third low-temperature water channel and the sixth low-temperature water channel.

Claims

1. A combined cooling device for nuclear power emergency diesel generator sets, characterized in that, include: A base plate is installed on the diesel generator set. The base plate has a first lubricating oil passage, a second lubricating oil passage, and a third lubricating oil passage that can converge at the same position. At the convergence point, there is a lubricating oil thermostatic valve that can connect any two of the lubricating oil passages. The end of the first lubricating oil passage away from the lubricating oil thermostatic valve has a lubricating oil inlet for delivering low-temperature lubricating oil to the diesel generator set. The end of the second lubricating oil passage away from the lubricating oil thermostatic valve has a lubricating oil outlet for outputting lubricating oil from the diesel generator set. The second lubricating oil passage also has a first heat exchange inlet. The end of the third lubricating oil passage away from the lubricating oil thermostatic valve has a first heat exchange outlet. A first heat exchanger is located on the upper part of the base plate. The first heat exchanger has a second heat exchange inlet and a second heat exchange outlet. The second heat exchange outlet is connected to the first heat exchange inlet, and the second heat exchange inlet is connected to the first heat exchange outlet. High-temperature lubricating oil flows sequentially through the first heat exchange inlet, the second heat exchange outlet, the second heat exchange inlet, and the first heat exchange outlet before entering the first lubricating oil channel and flowing towards the lubricating oil inlet. The first heat exchanger also has a third heat exchange inlet and a third heat exchange outlet. A fuel plate is located at the upper end of the first heat exchanger. The fuel plate has a first fuel inlet and a first fuel outlet. It also has a fourth heat exchange inlet that corresponds to and is connected to the third heat exchange inlet and a fourth heat exchange outlet that corresponds to and is connected to the third heat exchange outlet. The fuel plate also has a first fuel passage that is connected to the first fuel inlet and is used to discharge fuel from the diesel generator set. The fuel plate also has a second fuel passage that is connected to the first fuel outlet and is used to transport cooled fuel to the fuel tank of the diesel generator set. The second heat exchanger is located above the fuel plate. The second heat exchanger has a fifth heat exchange inlet that corresponds to and is connected to the first fuel inlet, a fifth heat exchange outlet that corresponds to and is connected to the first fuel outlet, a sixth heat exchange inlet that corresponds to and is connected to the fourth heat exchange inlet, and a sixth heat exchange outlet that corresponds to and is connected to the fourth heat exchange outlet. A cooling plate, positioned above the second heat exchanger, has six low-temperature water channels: a first, a second, a third, a fourth, a fifth, and a sixth. One end of the first low-temperature water channel is connected to a low-temperature water thermostatic valve, and the other end has a first low-temperature water inlet for supplying low-temperature water to the diesel generator set. One end of the second low-temperature water channel has a first low-temperature water outlet for outputting low-temperature water from the diesel generator set, and the other end is connected to the sixth heat exchanger inlet. One end of the third low-temperature water channel is connected to the sixth heat exchanger outlet. One end of the fourth low-temperature water channel has a... The diesel generator set outputs low-temperature water through a second low-temperature water outlet; one end of the fifth low-temperature water channel is connected to the low-temperature water thermostatic valve, and the other end is provided with a first low-temperature water inlet for conveying low-temperature water into the cooling plate; one end of the sixth low-temperature water channel is provided with a first low-temperature water outlet for discharging high-temperature water from the cooling plate, and the other end of the sixth low-temperature water channel is connected to the end of the fourth low-temperature water channel away from the second low-temperature water outlet and the end of the third low-temperature water channel away from the third heat exchange outlet, and the connection position of the sixth low-temperature water channel with the fourth low-temperature water channel and the third low-temperature water channel is connected to the low-temperature water thermostatic valve.

2. The combined cooling device for a nuclear power emergency diesel generator set according to claim 1, characterized in that, A radiator is also provided between the first low-temperature water inlet and the first low-temperature water outlet. Low-temperature water flows into the radiator along the first low-temperature water outlet and into the cooling plate along the first low-temperature water inlet.

3. A combined cooling device for a nuclear power emergency diesel generator set according to claim 2, characterized in that, The radiator is an air-cooled heat dissipation device.

4. A combined cooling device for a nuclear power emergency diesel generator set according to any one of claims 1-3, characterized in that, A throttling plug is also provided at the end where the third low-temperature water channel connects to the fourth low-temperature water channel and the sixth low-temperature water channel; a throttling plug is also provided at the end where the fourth low-temperature water channel connects to the third low-temperature water channel and the sixth low-temperature water channel.

5. A combined cooling device for a nuclear power emergency diesel generator set according to any one of claims 1-3, characterized in that, The second cryogenic water outlet is connected to the air cooler on the diesel generator set.

6. A combined cooling device for a nuclear power emergency diesel generator set according to any one of claims 1-3, characterized in that, The cooling plate is also provided with a first high-temperature water channel, a second high-temperature water channel, a third high-temperature water channel, a fourth high-temperature water channel and a high-temperature water merging channel. The first high-temperature water channel and the second high-temperature water channel are both connected to the high-temperature water merging channel. The high-temperature water merging channel, the third high-temperature water channel and the fourth high-temperature water channel are all connected to a high-temperature water thermostatic valve.

7. A combined cooling device for a nuclear power emergency diesel generator set according to claim 6, characterized in that, The cooling plate includes an upper plate segment and a lower plate segment. The fourth low-temperature water channel, the fifth low-temperature water channel, the first high-temperature water channel, the third high-temperature water channel, and the fourth high-temperature water channel are all located on the upper plate segment. The first low-temperature water channel, the second low-temperature water channel, and the third low-temperature water channel are located on the lower plate segment. The sixth low-temperature water channel, the second high-temperature water channel, and the high-temperature water merging channel all penetrate through the upper plate segment and the lower plate segment.

8. A combined cooling device for a nuclear power emergency diesel generator set according to claim 7, characterized in that, Both the cooling plate and the base plate are formed by casting, and each channel in the cooling plate and the base plate is a cast cavity.

9. A combined cooling device for a nuclear power emergency diesel generator set according to any one of claims 1-3, characterized in that, Both the first and second heat exchangers are plate heat exchangers, and the plates of both the first and second heat exchangers are made of stainless steel.

10. A combined cooling device for a nuclear power emergency diesel generator set according to claim 9, characterized in that, The cooling plate has multiple first connection holes, the base has second connection holes corresponding to the first connection holes, the first heat exchanger has third connection holes corresponding to the first connection holes, the second heat exchanger has fourth connection holes corresponding to the third connection holes, and the fuel plate has multiple fifth connection holes corresponding to the fourth connection holes. The cooling plate, the base, the first heat exchanger, the second heat exchanger, and the fuel plate are connected together by clamping bolts passing through the first, second, third, fourth, and fifth connection holes.

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