CN115506927A - Return oil cooling system - Google Patents

Abstract

The application provides an oil return cooling system is applied to the emergent diesel generator of nuclear power station, diesel generator include first oil inlet and with the first oil-out of first oil inlet intercommunication. The return oil cooling system includes: the first oil storage tank comprises a second oil inlet and a second oil outlet, and the second oil outlet is communicated with the first oil inlet to form an oil inlet channel; the heat exchanger comprises a first channel and a second channel isolated from the first channel, one end of the first channel is communicated with the first oil outlet, the other end of the first channel is communicated with the second oil inlet to form an oil return channel, and the second channel is communicated with an external water system. The heat exchanger can carry out heat exchange with the water of residual oil and outside water system, and then is favorable to improving diesel generator operation's security and stability.

Description

Return oil cooling system

Technical Field

The invention relates to the technical field of nuclear power, in particular to an oil return cooling system.

Background

At present, as the last electric power safety barrier of a nuclear power plant, a plurality of emergency diesel generators are used in the nuclear power plant. In order to ensure the safe operation of the unit, the unit can be matched with a cooling water, fuel oil, lubricating oil, compressed air and an air inlet and exhaust auxiliary system. When the diesel generator is operated, the oil storage tank supplies fuel required for operation combustion to the diesel generator through a matched fuel oil system. After fuel enters the diesel engine body for combustion, redundant unconsumed fuel returns to the oil storage tank after being heated and raised by the diesel engine body, so that the temperature of the fuel in the oil storage tank is raised, and the temperature of the fuel supplied to the diesel engine by the oil storage tank is raised. The increase of the oil supply temperature is not beneficial to the safe and stable operation of the diesel engine, and the requirement of a user can not be well met.

Disclosure of Invention

Based on this, this application provides an oil return cooling system to be favorable to guaranteeing that diesel generator's oil feed temperature maintains in reasonable within range, improve the security and the stability of diesel generator operation.

The application provides an oil return cooling system is applied to the emergent diesel generator of nuclear power station, diesel generator include first oil inlet and with the first oil-out of first oil inlet intercommunication. The return oil cooling system includes: the first oil storage tank comprises a second oil inlet and a second oil outlet, and the second oil outlet is communicated with the first oil inlet to form an oil inlet channel; the heat exchanger comprises a first channel and a second channel isolated from the first channel, one end of the first channel is communicated with the first oil outlet, the other end of the first channel is communicated with the second oil inlet to form an oil return channel, and the second channel is communicated with an external water system.

In this application, the heat exchanger can carry out heat exchange with the water of residual oil and outside water system. Specifically, the liquid in the first channel is residual oil from the diesel generator, and the second channel is communicated with an external water system. The external water system refers to a system that can supply cooling water having a temperature lower than the temperature of the residual oil to the second passage of the heat exchanger. It will be readily appreciated that the external water system may be an external water source that provides cooling water only to the heat exchanger, or may be a branch of cooling water from another cooling system.

The residual oil in the first channel of the heat exchanger is in a high-temperature state, the water in the second channel is low-temperature water provided by an external water system, and the water and the low-temperature water exchange heat to reduce the temperature of the residual oil. Then the low-temperature residual oil flows into a first oil storage tank communicated with the other end of the first channel, and the low-temperature oil is recovered. At the moment, the oil temperature of the oil in the first oil storage tank cannot rise, and the temperature of the fuel supplied to the diesel generator by the first oil storage tank is always in a stable state, so that the operation safety and stability of the diesel generator are improved.

In some embodiments, the external water system is a low-temperature water cooling system applied to the diesel generator, the diesel generator further includes a first water inlet and a first water outlet communicated with the first water inlet, the low-temperature water cooling system includes a first water tank, a first water pump and a cooling fan, the first water tank includes a second water inlet and a second water outlet, the second water outlet is communicated with the first water inlet, the first water pump is disposed between the second water outlet and the first water inlet, the first water outlet is communicated with the second water inlet to form a main channel, the cooling fan is configured to dissipate heat of liquid in the main channel, a third water outlet and a third water inlet are disposed on the main channel, the third water outlet is communicated with one end of the second channel, and the third water inlet is communicated with the other end of the second channel.

In some embodiments, the main channel includes a first sub-channel and a second sub-channel branched from the first water outlet, the first sub-channel and the second sub-channel converge at a side of the second water inlet facing away from the first water tank, the third water outlet and the third water inlet are sequentially disposed on a pipeline where the first sub-channel and the second sub-channel converge, and the cooling fan is configured to dissipate heat of the liquid in the first sub-channel.

In some embodiments, the cryogenic water cooling system further includes a temperature regulating valve, and the temperature regulating valve is disposed on a pipeline where the first sub-channel and the second sub-channel converge to regulate the temperature of the converged liquid.

In some embodiments, the third water outlet and the third water inlet are sequentially disposed between the temperature regulating valve and the second water inlet.

In some embodiments, the cryogenic water cooling system further comprises a controller electrically connected to the radiator fan and the temperature regulating valve, wherein the controller is configured to receive a temperature signal from the temperature regulating valve and control the rotation speed of the radiator fan.

In some embodiments, the heat exchanger comprises one of a plate heat exchanger or a tube heat exchanger.

In some embodiments, the return oil cooling system further includes a second oil storage tank communicating with the first oil storage tank, and a fuel delivery pump provided in a communication line of the second oil storage tank and the first oil storage tank.

In some embodiments, the external water system comprises a second water tank comprising a fourth water inlet and a fourth water outlet, the fourth water inlet being in communication with one end of the second channel and the fourth water outlet being in communication with the other end of the second channel.

In some embodiments, the diesel generator further comprises an oil supply pump in communication with the first oil inlet.

Drawings

FIG. 1 is a schematic diagram of a return oil cooling system and a diesel generator according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a cryogenic water cooling system and an oil return cooling system according to an embodiment of the present disclosure;

fig. 3 is another schematic diagram of the combination of the cryogenic water cooling system and the return oil cooling system according to the embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

At present, as the last electric power safety barrier of a nuclear power plant, a plurality of emergency diesel generators are used in the nuclear power plant. In order to ensure the safe operation of the unit, the unit can be matched with a cooling water, fuel oil, lubricating oil, compressed air and an air inlet and exhaust auxiliary system. When the diesel generator runs, the oil storage tank provides fuel oil required by running combustion for the diesel generator through a matched fuel oil system. After fuel enters the diesel engine body for combustion, redundant unconsumed fuel returns to the oil storage tank after being heated and raised by the diesel engine body, so that the temperature of the fuel in the oil storage tank is raised, and the temperature of the fuel supplied to the diesel engine by the oil storage tank is raised. The increase of the oil supply temperature is not beneficial to the safe and stable operation of the diesel engine, and the requirement of a user can not be well met. According to the prior experience, after the excessive unconsumed fuel oil returns to the oil storage tank through the diesel engine body, the temperature rise of about 10 ℃ can be generated, thereby seriously influencing the normal operation of the diesel generator.

Based on the above problem, this application has provided an oil return cooling system to guarantee that diesel generator's fuel feeding temperature is in reasonable scope, and then do benefit to the security that improves diesel generator operation.

As shown in fig. 1, the present application proposes an oil return cooling system 1 applied to an emergency diesel generator 2 of a nuclear power station. The diesel generator 2 includes a first oil inlet 21 and a first oil outlet 22 communicating with the first oil inlet 21. The scavenge cooling system 1 includes a first oil storage tank 10 and a heat exchanger 20. The first oil storage tank 10 includes a second oil inlet 101 and a second oil outlet 102. The second oil outlet 102 communicates with the first oil inlet 21 to form an oil inlet passage a. The heat exchanger 20 comprises a first channel 201 and a second channel 202 isolated from the first channel 201, one end of the first channel 201 is communicated with the first oil outlet 22, and the other end is communicated with the second oil inlet 101 of the first oil storage tank 10 to form an oil return channel B. The second passage 202 communicates with the external water system 6.

As shown in fig. 1, the diesel generator 2 generally includes a combustion cylinder 25 as a machine body 26 located outside the combustion cylinder 25. The first oil inlet 21 and the first oil outlet 22 communicate with the combustion cylinder 25, forming an oil supply passage of the combustion cylinder 25. The first oil inlet 21 communicates with the second oil outlet 102 of the first oil storage tank 10 to form an oil inlet passage a for the first oil storage tank 10 to supply oil to the diesel generator 2. The fuel which is not completely combusted in the diesel generator 2 flows out through the first oil outlet 22, passes through the heat exchanger 20, and finally returns to the first oil storage tank 10 through the second oil inlet 101, so that redundant fuel is recovered. The first oil outlet 22 is connected with one end of a first channel 201, and the other end of the first channel 201 is communicated with the second oil inlet 101 of the first oil storage tank 10. That is, the residual oil flowing out of the first oil outlet 22 flows into the first channel 201 of the heat exchanger 20 for heat dissipation, and then flows back to the first oil storage tank 10 for recycling and storage after heat dissipation. The heat exchange refers to heat exchange among objects, and has three basic forms of heat conduction, convection heat exchange and radiation heat exchange. Heat exchangers are commonly used in the industrial field for heat exchange between cold and hot media. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production, and the heat exchanger can be used as a heater, a cooler, an evaporator, a reboiler and the like in chemical production, so that the heat exchanger is widely applied. The heat exchanger 20 has a first passage 201 and a second passage 202 which are isolated from each other, the first passage 201 is used for flowing residual oil, and the second passage 202 is communicated with an external water system for circulating low-temperature water. The low-temperature water and the residual oil can exchange heat. In fig. 1, the first channel 201 and the second channel 202 of the heat exchanger 20 are simplified to show that the two channels are isolated from each other for heat exchange. In practice, the two channels may be in the form of a meander, a stack, etc.

In this application, the heat exchanger 20 can exchange heat with the residual oil with the water of the external water system. Specifically, the liquid in the first passage 201 is residual oil from the diesel generator 2, and the second passage 202 is communicated with an external water system. The external water system refers to a system that can supply cooling water having a temperature lower than the temperature of the residual oil to the second passage 202 of the heat exchanger 20. It will be readily appreciated that the external water system may be an external water source that provides cooling water only to the heat exchanger 20, or may be a branch of cooling water from another cooling system.

The residual oil in the first passage 201 of the heat exchanger 20 is in a high temperature state, the water in the second passage 202 is low temperature water provided by an external water system, and the two are subjected to heat exchange, so that the temperature of the residual oil is reduced. Then, the low-temperature residual oil flows into the first oil storage tank 10 communicating with the other end of the first passage 201, and the low-temperature oil is recovered. At this time, the oil temperature of the oil in the first oil storage tank 10 does not rise, and the temperature of the fuel supplied to the diesel generator 20 by the first oil storage tank 10 is always in a stable state, which is further beneficial to improving the safety and stability of the operation of the diesel generator 2.

The liquid flow in the second passage 202 may be the same as or opposite to the residual oil flow in the first passage 201. This is not limited by the present application.

As shown in fig. 2, in a specific embodiment, the external water system 6 is a cryogenic water cooling system 3 applied to the diesel generator 2. Diesel generator 2 is in the course of the work, because the combustion of combustion cylinder 25 internal combustion oil generates heat to can lead to diesel generator 2's mechanical main part 26 temperature to rise, if not in time dispel the heat to it, can make diesel generator 2's mechanical body life-span reduce, even cause the incident. The low-temperature water cooling system 3 is a cooling system for dissipating heat of the diesel generator 2. Therefore, the diesel generator 2 further comprises a first water inlet 23 and a first water outlet 24 communicating with the first water inlet 23. The cryogenic water cooling system 3 includes a first water tank 31, a first water pump 32, and a radiator fan 33. The first water tank 31 includes a second water inlet 311 and a second water outlet 312. The second water outlet 312 is communicated with the first water inlet 23, and the first water pump 32 is arranged between the second water outlet 312 and the first water inlet 23. The first water outlet 24 is communicated with the second water inlet 311 to form a main channel C, and the heat dissipation fan 33 is used for dissipating heat of the liquid in the main channel C. The main channel C is provided with a third water outlet 50 and a third water inlet 60, the third water outlet 50 is communicated with one end of the second channel 202, and the third water inlet 60 is communicated with the other end of the second channel 202.

In this embodiment, the cryogenic water cooling system 3 includes a first water tank 31, a first water pump 32, and a radiator fan 33. The second water outlet 312 of the first water tank 31 is communicated with the first water inlet 23 of the diesel generator 2, so that water in the first water tank 31 flows into the diesel generator 2 to dissipate heat of the machine body 26 of the diesel generator 2. The first water pump 32 is disposed between the second water outlet 312 and the first water inlet 23 to provide a driving force for the flow of liquid. The first water pump 32 may include one of a plunger pump, a vane pump, and the like. The first water outlet 24 communicates with the second water inlet 311 to form a main passage C. That is, after the water in the first water tank 31 comes out of the diesel generator 2, the temperature is first increased by heat exchange with the mechanical body of the diesel generator 2. The water with the increased temperature flows into the second water inlet 311 of the first water tank 31 from the first water outlet 24 to form a circulation. The radiator fan 33 also radiates heat from the liquid in the main passage C to lower the temperature of the water exiting the diesel generator 2. At this time, the main channel C is provided with a third water outlet 50 and a third water inlet 60, which are respectively communicated with the second channel 202. That is to say, in this embodiment, a branch D is branched from the main channel C of the low-temperature water cooling system 3, and the branch D is used to cool the residual oil in the first channel 201, thereby being beneficial to improving the safety and stability of the operation of the diesel generator 2.

In addition, in the related art, in order to prevent the excessive fuel from the emergency diesel generator 2 from having an excessively high temperature, a plurality of high-power fans, air conditioners and a large number of ventilation system air pipes are usually arranged in a room, and the first oil storage tank 10 and the high-temperature oil return pipeline are cooled by the ventilation system, so that the purpose of cooling the fuel is achieved, but the construction cost is greatly increased by the method. For example, the operation and maintenance cost and the operation and maintenance workload of equipment are greatly improved due to a plurality of fans, air conditioners and a large number of ventilation pipelines; a plurality of fans, air conditioners and a large number of ventilation pipelines are newly added in the limited plant layout space, most of the plant layout space can be occupied, the layout space is narrow, and therefore the construction cost is further increased. In the embodiment, the existing low-temperature water cooling system 3 applied to the diesel generator 2 is improved, and the branch D is cut off from the main channel C of the low-temperature water cooling system 3 to dissipate the residual oil, so that the existing conditions are fully utilized, the integration level of the return oil cooling system 1 and the low-temperature water cooling system 3 is improved, a plurality of high-power fans, air conditioners, a large number of ventilation system air pipes and other parts are not required to be additionally arranged, and the cost is saved.

Further, as shown in fig. 3, the main channel C includes a first sub-channel 241 and a second sub-channel 242 branched from the first water outlet 24, the first sub-channel 241 and the second sub-channel 242 converge at a side of the second water inlet 311 away from the first water tank 31, the third water outlet 50 and the third water inlet 60 are sequentially disposed on a pipeline where the first sub-channel 241 and the second sub-channel 242 converge, and the heat dissipation fan 33 is configured to dissipate heat of the liquid in the first sub-channel 241.

In this embodiment, the main channel C is divided into two parts, and the first part is two branches, i.e. a first sub-channel 241 and a second sub-channel 242, branched from the first water outlet 24 of the diesel generator 2. The second portion is a passage where the first sub-passage 241 and the second sub-passage 242 converge at a side of the second water inlet 311 facing away from the first water tank 31. That is, the main channel C has a structure of merging first, splitting second, and merging last, wherein the two branches of splitting are the first sub-channel 241 and the second sub-channel 242. The heat dissipation fan 33 is only used for dissipating heat of the liquid of the first sub-passage 241 to obtain low temperature water. In this way, the liquid temperature of the first sub-passage 241 is low, the liquid temperature of the second sub-passage 242 is high, and finally, confluence is performed, and the low-temperature water and the high-temperature water are mixed and then enter the first water tank 31 again, and then enter the diesel generator 2 again through water circulation. Through the mode of only radiating the liquid of first subchannel 241, be favorable to retrieving the waste heat, the energy saving. On the other hand, the third water outlet 50 and the third water inlet 60 are sequentially disposed on the pipeline after the first sub-channel 241 and the second sub-channel 242 converge, and the first sub-channel 241 is further cooled by the cooling fan 33, so that the temperature of the liquid in the branch D branched from the main pipeline C is not too high, the temperature difference between the water temperature and the residual oil is increased, and the improvement of the heat exchange effect is facilitated.

Further, as shown in fig. 3, the cryogenic water cooling system 3 further includes a temperature regulating valve 34, and the temperature regulating valve 34 is disposed on a pipeline where the first sub-channel 241 and the second sub-channel 242 converge to regulate the temperature of the converged liquid.

In this embodiment, the cryogenic water cooling system 3 further includes a temperature regulating valve 34. The temperature adjustment valve 34 is a valve body that can automatically adjust the temperature of the liquid. The temperature control device is widely applied to automatic temperature regulation in heating, air conditioning and domestic hot water, and automatic temperature regulation in special occasions, such as production engineering of chemical engineering, textile, pharmacy and the like. The temperature regulating valve 34 usually has a set threshold, and when the temperature of the merged water is higher than the set threshold, the temperature regulating valve 34 can regulate the water temperature to be near the set threshold, and the water meeting the temperature requirement flows into the first water tank 31 to form a circulation. For example, in one particular embodiment, the outlet temperature of the temperature regulating valve is set at 46 ℃.

Further, the third water outlet 50 and the third water inlet 60 are sequentially disposed between the temperature regulating valve 34 and the second water inlet 311. That is, branch D is disposed downstream of the temperature regulating valve 34, so that the temperature of the water entering the second passage 202 can be ensured to be lower than the temperature of the residual oil by the action of the set threshold of the temperature regulating valve 34, so as to meet the heat exchange requirement.

In a specific embodiment, the nominal diameter of two sections of the pipeline from the oil return channel B, i.e. the first oil outlet 22 to the first channel 201, and from the first channel 201 to the second oil inlet 102 of the first oil storage tank 10 is selected to be 50mm; the heat exchange capacity of the heat exchanger 20 is 30kW; the nominal diameter of the pipeline of the newly added branch D downstream of the temperature regulating valve 34 in the low-temperature water cooling system 3 is 50mm, that is, the nominal diameter of the pipeline connecting the third water outlet 50 with one end of the second channel 202 and the pipeline connecting the third water inlet 60 with the other end of the second channel 202 are both 50mm. The calculation result shows that the oil return temperature of the residual oil after heat exchange with low-temperature water can be reduced by about 12 ℃, and the temperature rise of about 10 ℃ after the fuel oil is returned by the diesel engine is effectively eliminated. The cooled residual oil is returned to the first oil storage tank 10 without bringing additional heat to the first oil storage tank 10 and thus without generating additional heat to the entire fuel system. The fuel oil which enters the diesel generator 2 again can still meet the requirement that the entering temperature of the diesel engine is less than 48 ℃, and simultaneously keeps the temperature difference of more than 10 ℃ with the flash point (60 ℃) of the diesel engine, thereby effectively ensuring the safe and stable operation of the diesel engine and well meeting the use requirements of customers.

The nominal diameter of the pipeline of the newly added branch D downstream of the temperature regulating valve 34 in the low-temperature water cooling system 3 is selected to be 50mm, that is, the nominal diameter of the pipeline connecting the third water outlet 50 and one end of the second channel 202 and the nominal diameter of the pipeline connecting the third water inlet 60 and the other end of the second channel 202 are both 50mm. Through heat conservation calculation, in the branch D after heat exchange with the residual oil, the temperature of the low-temperature water is increased by about 3 ℃, when the low-temperature water converges to the main channel C again through the third water inlet 60, the influence on the temperature rise of the low-temperature water is small, the temperature rise is about 0.5 ℃, and at the moment, the temperature of the low-temperature water entering the diesel generator 2 can still meet the requirement of a diesel engine.

In some embodiments, the cryogenic water cooling system 3 further includes a controller (not shown) electrically connected to the radiator fan 33 and the temperature regulating valve 34, and the controller is configured to receive a temperature signal from the temperature regulating valve 34 and control the rotation speed of the radiator fan 33. In this embodiment, a controller is further provided. The controller can control the rotation speed of the heat dissipation fan 33 according to the temperature detected by the temperature adjusting valve 34. When the converged water temperature is too high, the rotation speed of the cooling fan 33 is increased; when the converged water temperature is lower than the preset threshold, the rotation speed of the heat dissipation fan 33 may be reduced. In this way, the heat dissipation fan can automatically cooperate with the temperature adjustment valve 34 to adjust the water flow temperature of the channel, thereby being beneficial to improving the energy utilization rate.

In some embodiments, the heat exchanger 20 comprises one of a plate heat exchanger or a tube heat exchanger. Those skilled in the art can flexibly select the material according to the aspects of cost, installation convenience and the like.

In some embodiments, as shown in fig. 1, the scavenge cooling system 1 further includes a second oil storage tank 40 and a fuel transfer pump 70, the second oil storage tank 40 being in communication with the first oil storage tank 10, the fuel transfer pump 70 being disposed in the line that communicates the second oil storage tank 40 with the first oil storage tank 10. The second oil storage tank 40 is a master oil storage tank and functions to replenish the first oil storage tank 10. Generally, the height of the first oil reservoir 10 is higher than that of the second oil reservoir 40. Thus, when the first oil storage tank 10 is full, the excess fuel will overflow to the second oil storage tank 40, so that the system can continuously supply and return oil.

In some embodiments, as shown in fig. 1, the external water system 6 includes a second water tank 80, the second water tank 80 includes a fourth water inlet 81 and a fourth water outlet 82, the fourth water inlet 81 is communicated with one end of the second passage 202, and the fourth water outlet 82 is communicated with the other end of the second passage 202.

In this embodiment, the external water system is an external water source that operates alone. In particular, it comprises a second water tank 80. The fourth water inlet 81 of the second water tank 80 is communicated with one end of the second channel 202, and the fourth water outlet 82 is communicated with the other end of the second channel 202, so that the second channel 202 is communicated with the second water tank 80, heat exchange is carried out on residual oil in the first channel 201, and the safety and the stability of the operation of the diesel generator 2 are improved. In some embodiments, a water pump is further disposed between the fourth water outlet 82 and the second channel 202 to provide driving force for the liquid in the pipe.

In some embodiments, the diesel generator 2 further comprises a supply pump (not shown) in communication with the first oil inlet 21. The fuel feed pump can drive fuel into the first fuel inlet 21, so that the fuel feed efficiency of the fuel is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides an oil return cooling system, is applied to the emergent diesel generator of nuclear power station, diesel generator include first oil inlet and with the first oil-out of first oil inlet intercommunication, its characterized in that, oil return cooling system includes:

the first oil storage tank comprises a second oil inlet and a second oil outlet, and the second oil outlet is communicated with the first oil inlet to form an oil inlet channel;

the heat exchanger comprises a first channel and a second channel isolated from the first channel, one end of the first channel is communicated with the first oil outlet, the other end of the first channel is communicated with the second oil inlet to form an oil return channel, and the second channel is communicated with an external water system.

2. The return oil cooling system according to claim 1, wherein the external water system is a low-temperature water cooling system applied to the diesel generator, the diesel generator further includes a first water inlet and a first water outlet communicated with the first water inlet, the low-temperature water cooling system includes a first water tank, a first water pump and a cooling fan, the first water tank includes a second water inlet and a second water outlet, the second water outlet is communicated with the first water inlet, the first water pump is disposed between the second water outlet and the first water inlet, the first water outlet is communicated with the second water inlet to form a main channel, the cooling fan is used for cooling liquid in the main channel, a third water outlet and a third water inlet are disposed on the main channel, the third water outlet is communicated with one end of the second channel, and the third water inlet is communicated with the other end of the second channel.

3. The return oil cooling system of claim 2, wherein the main passage includes a first sub-passage and a second sub-passage branched from the first water outlet, the first sub-passage and the second sub-passage converge at a side of the second water inlet away from the first water tank, the third water outlet and the third water inlet are sequentially disposed on a pipeline where the first sub-passage and the second sub-passage converge, and the heat dissipation fan is configured to dissipate heat of the liquid in the first sub-passage.

4. The return oil cooling system according to claim 3, wherein the cryogenic water cooling system further comprises a temperature regulating valve, and the temperature regulating valve is disposed on a pipeline where the first sub-channel and the second sub-channel converge to regulate the temperature of the converged liquid.

5. The return oil cooling system of claim 4, wherein the third water outlet and the third water inlet are disposed in series between the temperature regulating valve and the second water inlet.

6. The return oil cooling system of claim 4, further comprising a controller electrically connected to the radiator fan and the temperature regulating valve, wherein the controller is configured to receive a temperature signal from the temperature regulating valve and control a rotation speed of the radiator fan.

7. The return oil cooling system of claim 1, wherein the heat exchanger comprises one of a plate heat exchanger or a tube heat exchanger.

8. The return oil cooling system according to claim 1, further comprising a second oil storage tank that communicates with the first oil storage tank, and a fuel delivery pump that is provided in a communication line of the second oil storage tank with the first oil storage tank.

9. The return oil cooling system according to claim 1, wherein the external water system includes a second water tank including a fourth water inlet and a fourth water outlet, the fourth water inlet communicating with one end of the second passage, the fourth water outlet communicating with the other end of the second passage.

10. The return oil cooling system of claim 1, wherein the diesel generator further includes an oil supply pump in communication with the first oil inlet.

Images