Method for determining working condition characteristics of Stirling engine and liquid metal fast reactor when Stirling engine is matched with liquid metal fast reactor

Abstract

The embodiment of the invention relates to the field of arrangement of reactors and engines, in particular to a method for determining working condition characteristics of a Stirling engine and a liquid metal fast reactor when the Stirling engine is matched with the liquid metal fast reactor. The Stirling engine is connected with the liquid metal fast reactor through a connecting structure so that hot metal of the liquid metal fast reactor can be input into the Stirling engine, and the hot metal returns to the liquid metal fast reactor through the Stirling engine after heat exchange of the hot metal in the Stirling engine. According to the method provided by the embodiment of the invention, the working condition characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine is matched with the liquid metal fast reactor can be determined, and research on the working condition characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine is matched with the liquid metal fast reactor is facilitated; and therefore, it can be guaranteed that the Stirling engine can have high circulation efficiency, and it can also be guaranteed that the liquid metal fast reactor has higher energy utilization efficiency.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of arrangement of reactors and engines, and in particular to a method for determining the operating characteristics of a Stirling engine and a liquid metal fast reactor when the Stirling engine and the liquid metal fast reactor are matched. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The Stirling engine is a thermoelectric conversion device based on the Stirling cycle. Due to its high cycle efficiency, it has broad application prospects.

[0004] In order to ensure that the Stirling engine can achieve a high cycle efficiency and realize the effective utilization of the Stirling engine, it is necessary to determine the operating characteristics of the Stirling engine and the nuclear reactor when the Stirling engine is matched with the nuclear reactor. However, there is currently no effective determination method in this regard. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In response to the above problems, an embodiment of the present application provides a method for determining the operating characteristics of a Stirling machine and a liquid metal fast reactor when the Stirling machine and the liquid metal fast reactor are matched. The Stirling machine and the liquid metal fast reactor are connected through a connecting structure to input hot metal from the liquid metal fast reactor into the Stirling machine. After the hot metal is heat exchanged in the Stirling machine, it is returned to the liquid metal fast reactor by the Stirling machine.

[0007] The method comprises the following steps: S10: respectively determining the parameters of the Stirling machine, the liquid metal fast reactor and the connection structure; S20: determining the parameters of the Stirling machine, the liquid metal fast reactor and the connection structure according to step S10, respectively determining the heat exchange of the Stirling machine, the pressure and temperature of the gas working medium of the Stirling machine, the temperature and flow rate of the hot metal of the liquid metal fast reactor, and the temperature of the connection structure; S30: determining the temperature and flow rate of the hot metal of the liquid metal fast reactor again according to the heat exchange of the Stirling machine and the temperature of the connection structure determined in step S20, and determining the heat exchange of the Stirling machine again according to the pressure and temperature of the gas working medium of the Stirling machine and the temperature of the connection structure determined in step S20; S40: determining the heat exchange of the Stirling machine determined in step S20 and the temperature of the connection structure determined in step S30. The first relationship between the comparison result of the heat exchange of the Stirling machine and the first predetermined value is determined, and the second relationship between the comparison result of the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S20 and the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S30 and the second predetermined value is determined; S50: Determine that the first relationship and the second relationship simultaneously meet the predetermined conditions, and determine that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S60: Determine that either or both of the first relationship and the second relationship do not meet the predetermined conditions, change the parameters of step S10, and repeat S20-S40 until the first relationship and the second relationship simultaneously meet the predetermined conditions, and determine that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S70: Determine the current operating characteristics of the Stirling machine and the liquid metal fast reactor.

[0008] The method provided in the embodiment of the present application can determine the operating characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine and the liquid metal fast reactor are matched, which is conducive to studying the operating characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine and the liquid metal fast reactor are matched, and further helps to ensure that the Stirling engine can have a higher cycle efficiency, and also helps to ensure that the liquid metal fast reactor can have a higher energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0010] Figure 1 It is a flow chart of a method for determining the operating characteristics of a Stirling machine and a liquid metal fast reactor when the Stirling machine and the liquid metal fast reactor are matched, provided in an embodiment of the present application.

[0011] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0012] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0013] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0014] In the related art, most of them are methods for determining the operating characteristics of the Stirling engine and other nuclear reactors when the Stirling engine is matched with other nuclear reactors, but there is no method for determining the operating characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine is matched with the liquid metal fast reactor.

[0015] In response to the above problems, an embodiment of the present application provides a method for determining the operating characteristics of a Stirling machine and a liquid metal fast reactor when the Stirling machine and the liquid metal fast reactor are matched. The Stirling machine and the liquid metal fast reactor are connected through a connecting structure to input hot metal from the liquid metal fast reactor into the Stirling machine. After the hot metal is heat exchanged in the Stirling machine, it is returned to the liquid metal fast reactor by the Stirling machine.

[0016] Figure 1The present invention shows a flow chart of a method for determining the operating characteristics of a Stirling machine and a liquid metal fast reactor when the Stirling machine and the liquid metal fast reactor are matched, provided by an embodiment of the present application. The method comprises the following steps: S10: respectively determining the parameters of the Stirling machine, the liquid metal fast reactor and the connection structure; S20: determining the parameters of the Stirling machine, the liquid metal fast reactor and the connection structure according to step S10, respectively determining the heat exchange capacity of the Stirling machine, the pressure and temperature of the gas working medium of the Stirling machine, the temperature and flow rate of the hot metal of the liquid metal fast reactor, and the temperature of the connection structure; S30: determining the temperature and flow rate of the hot metal of the liquid metal fast reactor again according to the heat exchange capacity of the Stirling machine and the temperature of the connection structure determined in step S20, and determining the heat exchange capacity of the Stirling machine again according to the pressure and temperature of the gas working medium of the Stirling machine and the temperature of the connection structure determined in step S20; S40 : Determine a first relationship between the heat exchange amount of the Stirling machine determined in step S20 and the comparison result of the heat exchange amount of the Stirling machine determined in step S30 and a first predetermined value, and determine a second relationship between the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S20 and the comparison result of the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S30 and a second predetermined value; S50: Determine that the first relationship and the second relationship simultaneously satisfy the predetermined conditions, and determine that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S60: Determine that either or both of the first relationship and the second relationship do not satisfy the predetermined conditions, change the parameters of step S10, and repeat S20-S40 until the first relationship and the second relationship simultaneously satisfy the predetermined conditions, and determine that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S70: Determine the current operating characteristics of the Stirling machine and the liquid metal fast reactor.

[0017] The method provided in the embodiment of the present application can determine the operating characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine and the liquid metal fast reactor are matched, which is conducive to studying the operating characteristics of the Stirling engine and the liquid metal fast reactor when the Stirling engine and the liquid metal fast reactor are matched, and further helps to ensure that the Stirling engine can have a higher cycle efficiency, and also helps to ensure that the liquid metal fast reactor can have a higher energy utilization efficiency.

[0018] In some embodiments, the liquid metal fast reactor may be a sodium-cooled fast reactor and the hot metal may be sodium.

[0019] In some embodiments, the parameters of the Stirling engine include the temperature and pressure of the gas working fluid of the Stirling engine, the parameters of the liquid metal fast reactor include the flow rate and temperature of the hot metal of the liquid metal fast reactor, and the parameters of the connection structure include its own temperature.

[0020] In certain embodiments, in step S10, according to the location, season and source of cold source of Stirling machine, determine the cold source temperature of Stirling machine. Because the location of Stirling machine is different. Different seasons and different sources of cold source will affect the cold source temperature of Stirling machine. Therefore, in such an embodiment, according to the location, season and source of cold source of Stirling machine, determine the cold source temperature of Stirling machine, which is conducive to improving the accuracy of the cold source temperature of Stirling machine determined.

[0021] In some embodiments, in step S10, the initial cold source temperature of the Stirling machine can be determined according to the season of the location of the Stirling machine; then, according to the location of the Stirling machine and the source of the cold source, the initial cold source temperature of the Stirling machine is adjusted to obtain the cold source temperature of the Stirling machine.

[0022] In some embodiments, when the season at the location of the Stirling engine is spring or summer, the initial cold source temperature of the Stirling engine is 20°C; when the season at the location of the Stirling engine is autumn or winter, the initial cold source temperature of the Stirling engine is 10°C.

[0023] In some embodiments, in step S10, the location of the Stirling machine may be a latitude location. When the location of the Stirling machine is at a predetermined latitude of north latitude, the initial cold source temperature of the Stirling machine is reduced by 5°C; after the latitude increases by a predetermined value, the temperature is further reduced by 2°C; when the location of the Stirling machine is at a predetermined latitude of south latitude, the initial cold source temperature of the Stirling machine is reduced by 5°C; after the latitude increases by a predetermined value, the temperature is further reduced by 2°C.

[0024] In some embodiments, in step S10, the source of the cold source may be surface water or groundwater. When the cold source is groundwater, at a position where the distance between the cold source and the ground surface is a predetermined value, the temperature of the Stirling machine is reduced by 1°C based on the initial cold source temperature, and the temperature is increased by a predetermined value for each increase in the predetermined value.

[0025] In some embodiments, in step S20, when determining the heat exchange rate of the Stirling machine, the cold source temperature of the Stirling machine affects the heat exchange rate of the Stirling machine. Therefore, in such an embodiment, by determining the cold source temperature of the Stirling machine, it is helpful to improve the accuracy of the determined heat exchange rate of the Stirling machine.

[0026] In some embodiments, the cold source temperature of the Stirling machine is 10° C. to 30° C. In such embodiments, the cold source temperature of the Stirling machine can be adjusted by adjusting the location, season and source of the cold source of the Stirling machine so that the cold source temperature of the Stirling machine is within the above temperature range.

[0027] In some embodiments, in step S20, the heat exchange amount of the Stirling engine is the heat exchange amount between the working fluid in the Stirling engine and the hot metal of the liquid metal fast reactor.

[0028] In some embodiments, in step S20, when determining the heat exchange amount of the Stirling machine, the loss caused by the non-uniform heat transfer of the working medium of the Stirling machine is determined, and the heat exchange amount of the Stirling machine is determined based on the loss. In such an embodiment, determining the heat exchange amount of the Stirling machine based on the loss can improve the accuracy of the determined heat exchange amount of the Stirling machine, and further improve the accuracy of the determined operating condition characteristics.

[0029] In some embodiments, in step S20, when determining the heat exchange amount of the Stirling machine, the loss of heat dissipation of the working medium of the Stirling machine is determined, and the heat exchange amount of the Stirling machine is determined based on the loss. In such an embodiment, determining the heat exchange amount of the Stirling machine based on the loss of heat dissipation of the working medium of the Stirling machine can improve the accuracy of the determined heat exchange amount of the Stirling machine, and further improve the accuracy of the determined operating condition characteristics.

[0030] In some embodiments, in step S20, when determining the heat exchange of the Stirling machine, the piston shuttle loss and the piston pumping loss of the Stirling machine are determined, and the heat exchange of the Stirling machine is determined based on the losses. In such an embodiment, determining the heat exchange of the Stirling machine based on the piston shuttle loss and the piston pumping loss of the Stirling machine is conducive to improving the accuracy of the determined operating condition characteristics.

[0031] In some embodiments, in step S60, different matrix solving methods are used to determine the working conditions of the liquid metal fast reactor and the working conditions of the Stirling machine. Since the working conditions of the liquid metal fast reactor and the Stirling machine have different characteristics, the embodiments of the present application can ensure the accuracy of the working conditions of the liquid metal fast reactor and the working conditions of the Stirling machine by using different matrix solving methods.

[0032] In some embodiments, the LU matrix solving method is used to determine the working condition of the liquid metal fast reactor, and the PDMA method is used to determine the working condition of the Stirling engine. In such embodiments, it is beneficial to quickly solve the working condition of the liquid metal fast reactor and the working condition of the Stirling engine.

[0033] In some embodiments, in step S60, a method of compressing the matrix can be used to reduce the number of storage units when determining the operating conditions of the liquid metal fast reactor and the Stirling machine. In such an embodiment, the above arrangement is conducive to simplifying the matrix solution process and improving the solution efficiency.

[0034] In some embodiments, in step S20, when determining the heat exchange amount of the Stirling machine, the type of the Stirling machine is first determined, and the heat exchange amount of the Stirling machine is determined according to the type. Since the heat exchange amounts of different Stirling machines are different, in such an embodiment, first determining the type of the Stirling machine and then determining the heat exchange amount of the Stirling machine is conducive to improving the accuracy of the determined heat exchange amount of the Stirling machine.

[0035] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0036] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for determining the operating characteristics of a Stirling machine and a liquid metal fast reactor when the Stirling machine and the liquid metal fast reactor are matched, wherein the Stirling machine and the liquid metal fast reactor are connected by a connecting structure so that hot metal of the liquid metal fast reactor is input into the Stirling machine, and the hot metal is returned to the liquid metal fast reactor by the Stirling machine after heat exchange in the Stirling machine, characterized in that: It includes the following steps: S10: respectively determining parameters of the Stirling machine, the liquid metal fast reactor and the connection structure; S20: Determine the parameters of the Stirling machine, the liquid metal fast reactor and the connection structure according to step S10, and respectively determine the heat exchange capacity of the Stirling machine, the pressure and temperature of the gas working medium of the Stirling machine, the temperature and flow rate of the hot metal of the liquid metal fast reactor, and the temperature of the connection structure; S30: determining the temperature and flow rate of the hot metal of the liquid metal fast reactor again according to the heat exchange capacity of the Stirling machine determined in step S20, and determining the heat exchange capacity of the Stirling machine again according to the pressure and temperature of the gas working medium of the Stirling machine and the temperature of the connection structure determined in step S20; S40: determining a first relationship between the heat exchange amount of the Stirling machine determined in step S20 and the comparison result of the heat exchange amount of the Stirling machine determined in step S30 and a first predetermined value, determining a second relationship between the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S20 and the comparison result of the temperature and flow rate of the hot metal of the liquid metal fast reactor determined in step S30 and a second predetermined value, S50: determining that the first relationship and the second relationship simultaneously satisfy a predetermined condition, and determining that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S60: determining that either or both of the first relationship and the second relationship do not satisfy a predetermined condition, changing the parameters of step S10, and repeating S20-S40 until both the first relationship and the second relationship satisfy the predetermined condition, and determining that the current operating characteristics of the Stirling machine and the liquid metal fast reactor match; S70: Determine current operating characteristics of the Stirling machine and the liquid metal fast reactor.

2. The method according to claim 1, characterized in that: In step S10, the cold source temperature of the Stirling engine is determined according to the location of the Stirling engine, the season and the source of the cold source.

3. The method according to claim 2, characterized in that In step S20, when determining the heat exchange amount of the Stirling engine, the cold source temperature of the Stirling engine affects the heat exchange amount of the Stirling engine.

4. The method according to claim 1, characterized in that In step S20, when determining the heat transfer amount of the Stirling machine, the loss caused by the non-uniform heat transfer of the working medium of the Stirling machine is determined. The heat exchange capacity of the Stirling engine is determined based on the loss.

5. The method according to claim 1, characterized in that In step S20, when determining the heat exchange amount of the Stirling engine, the heat dissipation loss of the working medium of the Stirling engine is determined. The heat exchange capacity of the Stirling engine is determined based on the loss.

6. The method according to claim 1, characterized in that In step S20, when determining the heat exchange amount of the Stirling engine, the piston shuttle loss and the piston pumping loss of the Stirling engine are determined. The heat exchange capacity of the Stirling engine is determined based on the loss.

7. The method according to claim 6, characterized in that In step S60, different matrix solving methods are used to determine the operating conditions of the liquid metal fast reactor and the operating conditions of the Stirling engine.

8. The method according to claim 7, characterized in that The LU matrix solving method is used to determine the working condition of the liquid metal fast reactor, and the PDMA method is used to determine the working condition of the Stirling engine.

9. The method according to claim 7 or 8, characterized in that: In step S60, a compression matrix method is used when determining the operating conditions of the liquid metal fast reactor and the Stirling engine to reduce the number of storage units.

10. The method according to claim 1, characterized in that In step S20, when determining the heat exchange capacity of the Stirling engine, the type of the Stirling engine is first determined, and the heat exchange capacity of the Stirling engine is determined according to the type.

Images