Valuing method and device for high temperature duration of nuclear power plant, storage medium and electronic equipment

Abstract

The invention relates to a valuing method and device for high temperature duration of a nuclear power plant, a storage medium and electronic equipment. The method comprises the following steps: determining a daily temperature change curve; the daily temperature change curve is analyzed, and the envelope area of heat input is determined; and calculating according to the envelope area of heat input to obtain the duration of high temperature. On the premise that nuclear safety is not reduced, the design capacity of the nuclear island ventilation air-conditioning system of the nuclear power plant is reduced, and cost is saved. And meanwhile, the margin of the current nuclear power plant nuclear island ventilation air-conditioning system to the high temperature can be obtained, and reference is provided for margin analysis. And the influence of climate change on the nuclear island ventilation air-conditioning system of the nuclear power plant can also be rechecked for the nuclear power plant in operation in combination with the method.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant disaster protection, and more specifically to a method, device, storage medium and electronic equipment for obtaining a value of a high temperature duration in a nuclear power plant. Background Art

[0002] To prevent the high summer temperatures from affecting the operation of nuclear safety-related equipment in nuclear power plants, for example, excessively high ambient temperatures may cause the temperature inside the nuclear island building to exceed the tolerance of the equipment, leading to damage to important equipment and possible nuclear safety incidents. In order to maintain a comfortable working environment for staff, the design of the nuclear island ventilation and air-conditioning system takes into account the safe design temperature. As long as the temperature of the external environment of the nuclear power plant does not exceed this safe temperature, the internal equipment environment and personnel environment will not be challenged.

[0003] At present, the design of nuclear island ventilation and air conditioning systems in nuclear power plants mainly uses the highest safe design dry bulb temperature as the design reference temperature. The value is obtained by accumulating the hottest four months of the year without guaranteeing the 2h hourly dry bulb temperature. The data collection time span is more than 30 years of meteorological station data. At the same time, the selection of nuclear power plant temperature requires the use of extreme temperatures, which represent the extreme values ​​of meteorological environmental parameters, and long-term data should be able to cover at least 30 years or longer.

[0004] Based on the above, it can be seen that the existing methods only provide a method for obtaining the design reference temperature value, and do not specify a method for calculating the temperature duration. In the design of nuclear power plants, for conservative reasons, the high temperature of 2h is not guaranteed to last for a long time, and the extreme temperature is also considered to last for a relatively long time. Due to the actual extreme temperature and the fact that the 2h temperature duration is not guaranteed to be short, it is too conservative to consider it according to long-term operation, resulting in a large design capacity for the ventilation and air-conditioning system. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method, device, storage medium and electronic equipment for obtaining the duration of high temperature in a nuclear power plant in view of the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for obtaining the duration of high temperature in a nuclear power plant, comprising the following steps:

[0007] Determine the daily temperature curve;

[0008] Analyze the daily temperature change curve to determine the envelope area of ​​heat input;

[0009] The duration of the high temperature is obtained by calculating according to the envelope area of ​​the heat input.

[0010] In the method for determining the duration of high temperature in a nuclear power plant according to the present invention, determining the daily temperature change curve includes:

[0011] Get daily historical data of temperature;

[0012] Analyzing and processing the daily historical data of the temperature to obtain a sine curve;

[0013] The sinusoidal curve is equivalent to the daily temperature change curve.

[0014] In the method for determining the duration of high temperature in a nuclear power plant according to the present invention, the step of analyzing the daily temperature change curve to determine the envelope area of ​​heat input includes:

[0015] Based on the sine curve, obtaining a sine function;

[0016] determining a tangent point of the sine function;

[0017] determining an envelope area of ​​heat input based on the tangent point;

[0018] The envelope area is calculated to obtain the envelope area of ​​the heat input.

[0019] In the method for determining the duration of high temperature in a nuclear power plant according to the present invention, the envelope area of ​​heat input determined based on the tangent point includes:

[0020] Draw a tangent line based on the tangent point;

[0021] Performing area division according to the tangent to obtain multiple line segments from the envelope origin to the set point;

[0022] A closed area is formed based on the multiple line segments to obtain an envelope area of ​​the heat input; the closed area is the envelope area of ​​the heat input.

[0023] In the method for obtaining the duration of high temperature in a nuclear power plant according to the present invention, the area calculation of the envelope region to obtain the envelope area of ​​the heat input includes:

[0024] Determine a corresponding area expression based on the envelope area;

[0025] Performing a derivative operation according to the area expression to determine the extreme value of the function corresponding to the envelope area;

[0026] Calculating according to the extreme value of the corresponding function to obtain the minimum area value of the envelope region;

[0027] The minimum area value of the envelope region is the envelope area.

[0028] In the method for obtaining the duration of high temperature in a nuclear power plant according to the present invention, the calculation based on the envelope area of ​​the heat input to obtain the duration of high temperature includes:

[0029] Determining a mathematical expression of the tangent line based on the minimum area value of the envelope region;

[0030] The duration of the high temperature is obtained by performing calculation according to the mathematical expression of the tangent line.

[0031] In the method for obtaining the duration of high temperature in a nuclear power plant according to the present invention, the step of calculating according to the mathematical expression of the tangent to obtain the duration of high temperature includes:

[0032] Calculate according to the mathematical expression of the tangent line to obtain the length of the shortest line segment of the envelope area;

[0033] The duration corresponding to the shortest line segment is obtained by performing conversion based on the corresponding relationship between the sine curve and the daily duration;

[0034] Perform a product operation on the length of the shortest line segment and the duration to obtain the time corresponding to the length of the shortest line segment;

[0035] A symmetric operation is performed based on the symmetric characteristics of the sine curve and the time corresponding to the length of the shortest line segment to obtain the duration of the high temperature.

[0036] The present invention also provides a device for obtaining a value of the duration of high temperature in a nuclear power plant, comprising:

[0037] A temperature curve determination unit, used to determine a daily temperature change curve;

[0038] A curve analysis unit, used to analyze the daily temperature change curve to determine the envelope area of ​​heat input;

[0039] The time calculation unit is used to calculate according to the envelope area of ​​the heat input to obtain the duration of the high temperature.

[0040] The present invention also provides a storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor to execute the steps of the method for determining the duration of high temperature in a nuclear power plant as described above.

[0041] The present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the method for determining the duration of high temperature in a nuclear power plant as described above by calling the computer program stored in the memory.

[0042] The method, device, storage medium and electronic device for determining the duration of high temperature in a nuclear power plant according to the present invention have the following beneficial effects: including the following steps: determining the daily temperature change curve; analyzing the daily temperature change curve to determine the envelope area of ​​the heat input; calculating according to the envelope area of ​​the heat input to obtain the duration of the high temperature. The present invention can reduce the design capacity of the ventilation and air-conditioning system of the nuclear island of a nuclear power plant without reducing nuclear safety, thereby saving costs. At the same time, the margin of the ventilation and air-conditioning system of the nuclear island of the current nuclear power plant for high temperatures can also be obtained, providing a reference for margin analysis. The impact of climate change on the ventilation and air-conditioning system of the nuclear island of a nuclear power plant can also be reviewed for operating nuclear power plants in combination with the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0044] Figure 1 It is a flow chart of a method for obtaining a value of a high temperature duration of a nuclear power plant provided by the present invention;

[0045] Figure 2 It is a schematic diagram of an equivalent daily temperature change curve provided by the present invention;

[0046] Figure 3 The present invention provides a logic block diagram of a device for obtaining a value of a high temperature duration in a nuclear power plant. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to solve the problem of high temperature without duration in the design of nuclear power plants, the present invention provides a method for determining the duration of high temperature in nuclear power plants. The method can reduce the design capacity of the ventilation and air-conditioning system of the nuclear island of the nuclear power plant and save costs without reducing nuclear safety. The margin of the ventilation and air-conditioning system of the nuclear island of the current nuclear power plant to cope with high temperatures can be obtained for margin analysis. For operating nuclear power plants, climate change may cause the high temperature of the plant site to rise, which may exceed the design reference value. This method can be used to review the impact of climate change on the ventilation and air-conditioning system of the nuclear island of the nuclear power plant.

[0049] refer to Figure 1 , Figure 1 A flow chart of a preferred embodiment of a method for determining the duration of high temperature in a nuclear power plant provided by the present invention.

[0050] Specifically, Figure 1 As shown, the method for obtaining the value of the high temperature duration of the nuclear power plant includes the following steps:

[0051] Step S101: Determine the daily temperature change curve.

[0052] In an embodiment of the present invention, determining the daily temperature change curve includes: obtaining daily historical data of the temperature; analyzing and processing the daily historical data of the temperature to obtain a sine curve; and equating the sine curve to the daily temperature change curve.

[0053] Specifically, for daily temperature changes, the surface temperature usually rises gradually after sunrise and drops gradually after sunset, and the temperature is a continuous change process. By analyzing the daily historical data of temperature, it can be determined that the daily temperature change curve is similar to a sine curve. Therefore, the sine curve is equivalent to the daily temperature change curve.

[0054] Step S102: Analyze the daily temperature change curve to determine the envelope area of ​​heat input.

[0055] In an embodiment of the present invention, the daily temperature change curve is analyzed to determine the envelope area of ​​the heat input, including: obtaining a sine function based on a sine curve; determining the tangent point of the sine function; determining the envelope area of ​​the heat input based on the tangent point; and calculating the area of ​​the envelope area to obtain the envelope area of ​​the heat input.

[0056] Among them, determining the envelope area of ​​heat input based on the tangent point includes: drawing tangents based on the tangent points; dividing the area according to the tangents to obtain multiple line segments from the envelope origin to the set point; forming a closed area based on the multiple line segments to obtain the envelope area of ​​heat input; the closed area is the envelope area of ​​heat input.

[0057] In an embodiment of the present invention, the area of ​​the envelope area is calculated to obtain the envelope area of ​​the heat input, including: determining a corresponding area expression based on the envelope area; performing a derivative operation according to the area expression to determine the extreme value of the function corresponding to the envelope area; performing calculation according to the extreme value of the corresponding function to obtain the minimum area value of the envelope area; the minimum area value of the envelope area is the envelope area.

[0058] Step S103: Calculate according to the envelope area of ​​the heat input to obtain the duration of the high temperature.

[0059] It should be noted that the high temperature referred to in the present invention mainly refers to the extreme temperature and design reference temperature of nuclear power plants. Among them, the extreme temperature refers to the highest point in the daily temperature change, that is, the temperature in 30 years is sorted from high to low, and the highest temperature is taken. The design reference temperature refers to the hourly temperature of the hottest four months of each year in a period of not less than 30 years, which is statistically put together, and the highest two points of data (each point represents one hour of data) are removed to obtain the third highest point data, which is used as the design reference temperature of the nuclear power plant.

[0060] In an embodiment of the present invention, the duration of the high temperature is obtained by calculating according to the envelope area of ​​the heat input, including: determining the mathematical expression of the tangent based on the minimum area of ​​the envelope area; and obtaining the duration of the high temperature by calculating according to the mathematical expression of the tangent.

[0061] Among them, calculating according to the mathematical expression of the tangent to obtain the duration of the high temperature includes: calculating according to the mathematical expression of the tangent to obtain the length of the shortest line segment in the envelope area; converting based on the correspondence between the sine curve and the daily duration to obtain the duration corresponding to the shortest line segment; performing a product operation based on the length of the shortest line segment and the duration to obtain the time corresponding to the length of the shortest line segment; performing a symmetric operation based on the symmetric characteristics of the sine curve and the time corresponding to the length of the shortest line segment to obtain the duration of the high temperature.

[0062] Specifically, assume that the daily temperature change curve is a sine curve, such as Figure 2 As shown. First, the sinusoidal curve y=sin(x) passing through the origin is used for analysis. After the analysis is completed, the horizontal axis is converted into time and the vertical axis is converted into temperature, which can be restored to the change in temperature. The integral of temperature over time can be considered as heat input, and the heat input from the origin O to point A (π / 2, 0) is the area enclosed by the curve OB, line segment BA, and line segment AO. To ensure that the actual heat input can be enclosed, the analysis is carried out by making tangents. The trapezoidal area enclosed by the line segments FE, EB, BA, and AF can envelop the area enclosed by the sinusoidal curve from the origin to π / 2, and the length of the EB line segment can be used as the duration of the high temperature.

[0063] Specifically, Figure 2 As shown, let the tangent point of the sine function be M(x0, sin(x0)), x0∈[0,π / 2]. Wherein, the tangent point M is any point from the origin 0 to π / 2. Then the slope of the tangent is cos(x0). The area of ​​the trapezoid enclosed by line segments FE, EB, BA, and AF is the minimum area of ​​the envelope area. Wherein, the expression of the area of ​​the trapezoid enclosed by line segments FE, EB, BA, and AF is:

[0064] S=(1 / 2)*1*[π / 2-x0+tan(x0)+π / 2-x0+tan(x0)-1 / cos(x0)], x0∈[0,π / 2];

[0065] By taking the derivative of S with respect to x0 and setting the derivative equal to 0, the extreme value of the function (i.e., the maximum or minimum) can be obtained. Then, the second-order derivative or numerical substitution can be used to determine the minimum value of this function at x0∈[0,π / 2].

[0066] After calculation, when x0=0, the area S enclosed by the trapezoid reaches the minimum value. At this time, the mathematical expression of the corresponding tangent is:

[0067] y=cos(0)*(x-0)+sin(0), that is, y=x.

[0068] Let y = 1, then x = 1. The coordinates of point E are (1, 1), and the length of line segment BE is π / 2-1, which is approximately 0.571. Then (line segment EB) / (line segment OA) = 0.571 / (π / 2), which is approximately 0.364.

[0069] Since the length of a day is 24 hours, the line segment OA is 1 / 4 of the sine length, and the corresponding length of 1 / 4 of the day is 6 hours, then the length of the line segment EB corresponds to: 6h*0.364=2.184h. Since the rising and falling segments of the sine curve are symmetrical, the duration of the high temperature is 2*2.184=4.368h.

[0070] refer to Figure 3 , Figure 3 The invention provides a device for obtaining a value of the duration of high temperature in a nuclear power plant.

[0071] like Figure 3 As shown, the value-taking device for the duration of high temperature in the nuclear power plant includes:

[0072] The temperature curve determining unit 301 is used to determine the daily temperature change curve.

[0073] The curve analysis unit 302 is used to analyze the daily temperature change curve and determine the envelope area of ​​the heat input.

[0074] The time calculation unit 303 is used to calculate according to the envelope area of ​​the heat input to obtain the duration of the high temperature.

[0075] Specifically, the specific coordination operation process between the various units in the device for taking the value of the duration of high temperature in a nuclear power plant can refer to the above-mentioned method for taking the duration of high temperature in a nuclear power plant, which will not be repeated here.

[0076] By applying this method, the following objectives can be achieved:

[0077] Without reducing nuclear safety, the design capacity of the ventilation and air-conditioning system of the nuclear island of a nuclear power plant can be reduced, thus saving costs.

[0078] The margin of the current nuclear power plant nuclear island ventilation and air conditioning system to cope with high temperatures can be obtained for margin analysis;

[0079] For operating nuclear power plants, climate change may cause the temperature at the plant site to rise, which may exceed the design reference value. This method can be used to review the impact of climate change on the ventilation and air-conditioning system of the nuclear island of the nuclear power plant.

[0080] In addition, an electronic device of the present invention includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement a method for obtaining a value of the duration of high temperature in a nuclear power plant as described in any of the above items. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and when executed, it executes the above functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, a desktop, a tablet computer, a smart phone, or a server.

[0081] In addition, a storage medium of the present invention stores a computer program thereon, and when the computer program is executed by a processor, it implements any of the above methods for obtaining the duration of high temperature in a nuclear power plant. Specifically, it should be noted that the above storage medium of the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0082] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0083] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0084] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0085] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0086] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for determining the duration of high temperature in a nuclear power plant, characterized in that: The following steps are involved: Determine the daily temperature curve; Analyze the daily temperature change curve to determine the envelope area of ​​heat input; The duration of the high temperature is obtained by calculating according to the envelope area of ​​the heat input.

2. The method for determining the duration of high temperature in a nuclear power plant according to claim 1, characterized in that: Determining the daily temperature change curve comprises: Get daily historical data of temperature; Analyzing and processing the daily historical data of the temperature to obtain a sine curve; The sinusoidal curve is equivalent to the daily temperature change curve.

3. The method for determining the duration of high temperature in a nuclear power plant according to claim 2, characterized in that: Analyzing the daily temperature change curve to determine the envelope area of ​​heat input includes: Based on the sine curve, obtaining a sine function; determining a tangent point of the sine function; determining an envelope area of ​​heat input based on the tangent point; The envelope area is calculated to obtain the envelope area of ​​the heat input.

4. The method for determining the duration of high temperature in a nuclear power plant according to claim 3, characterized in that: The envelope area of ​​heat input determined based on the tangent point comprises: Draw a tangent line based on the tangent point; Performing area division according to the tangent to obtain multiple line segments from the envelope origin to the set point; A closed area is formed based on the multiple line segments to obtain an envelope area of ​​the heat input; the closed area is the envelope area of ​​the heat input.

5. The method for determining the duration of high temperature in a nuclear power plant according to claim 4, characterized in that: The step of calculating the area of ​​the envelope region to obtain the envelope area of ​​the heat input comprises: Determine a corresponding area expression based on the envelope area; Performing a derivative operation according to the area expression to determine the extreme value of the function corresponding to the envelope area; Calculating according to the extreme value of the corresponding function to obtain the minimum area value of the envelope region; The minimum area value of the envelope region is the envelope area.

6. The method for determining the duration of high temperature in a nuclear power plant according to claim 5, characterized in that: The step of calculating the duration of the high temperature according to the envelope area of ​​the heat input comprises: Determining a mathematical expression of the tangent line based on the minimum area value of the envelope region; The duration of the high temperature is obtained by performing calculation according to the mathematical expression of the tangent line.

7. The method for determining the duration of high temperature in a nuclear power plant according to claim 6, characterized in that: The step of calculating according to the mathematical expression of the tangent to obtain the duration of the high temperature comprises: Calculate according to the mathematical expression of the tangent line to obtain the length of the shortest line segment of the envelope area; The duration corresponding to the shortest line segment is obtained by performing conversion based on the corresponding relationship between the sine curve and the daily duration; Perform a product operation on the length of the shortest line segment and the duration to obtain the time corresponding to the length of the shortest line segment; A symmetric operation is performed based on the symmetric characteristics of the sine curve and the time corresponding to the length of the shortest line segment to obtain the duration of the high temperature.

8. A device for determining the duration of high temperature in a nuclear power plant, characterized in that: include: A temperature curve determination unit, used to determine a daily temperature change curve; A curve analysis unit, used to analyze the daily temperature change curve to determine the envelope area of ​​heat input; The time calculation unit is used to calculate according to the envelope area of ​​the heat input to obtain the duration of the high temperature.

9. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the steps of the method for determining the duration of high temperature in a nuclear power plant as described in any one of claims 1 to 7.

10. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the method for obtaining the duration of high temperature in a nuclear power plant as described in any one of claims 1 to 7 by calling the computer program stored in the memory.

Images