Dirt thickness calculation method, device and equipment of reactor and storage medium

Abstract

The invention provides a reactor dirt thickness calculation method and device, equipment and a storage medium, and relates to the technical field of nuclear reactors. According to the method, the nickel solubility of the target position is obtained, and the mass transmission model of the target position is constructed based on the nickel solubility of the target position, the total concentration of corrosion products in the coolant system and the mass flow transferred by dirt deposition of the target position; a mass balance model of the coolant system is constructed based on the total concentration of the corrosion products in the coolant system, the mass flow transferred by dirt deposition at the target position and the total release rate of the corrosion products in the coolant system; and the mass flow transferred by the dirt deposition of the target position is solved based on the mass transfer model of the target position and the mass balance model of the coolant system, and the dirt thickness of the target position is calculated based on the mass flow transferred by the dirt deposition of the target position, so that the dirt thickness calculation of the reactor is realized.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear reactors, and in particular to a method, device, equipment and storage medium for calculating the fouling thickness of a reactor. Background Art

[0002] Reactor core fouling-induced axial power deviation (CIPS) and local cladding corrosion (CILC) will affect the safety and economy of reactor operation, and is also one of the key challenges for improving the performance of pressurized water reactors, which has attracted increasing attention in the nuclear power industry. The phenomenon caused by reactor core fouling is an important factor affecting the safety and economy of reactor operation, and the risk assessment of reactor core fouling may become an important issue of concern to the industry in the future.

[0003] There are dissolved and suspended (solid) corrosion products in the coolant of nuclear power plants, and their particle size is small. Coolant samples show that the total content of nickel and iron in the particles exceeds the expected solubility of nickel and iron in the core coolant, indicating the presence of suspended particles in the coolant. Under normal operating conditions, the corrosion products dissolved in the coolant are saturated and carry additional suspended particles or colloidal substances. When the reactor is in operation, the corrosion products (nickel, iron, etc.) on the coolant system pipes will be released into the coolant and deposited on the walls of the fuel assemblies to form scale. Summary of the invention

[0004] In view of this, the present application provides a method, device, equipment and storage medium for calculating the fouling thickness of a reactor to realize the calculation of the fouling thickness of the reactor.

[0005] In a first aspect, the present application provides a method for calculating the fouling thickness of a reactor, comprising:

[0006] Obtain nickel solubility at target location;

[0007] A mass transfer model for the target location is constructed based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposits transferred at the target location;

[0008] constructing a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits delivered at the target location, and the total release rate of corrosion products in the coolant system;

[0009] Solving the mass flow rate of fouling deposit transfer at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system;

[0010] The fouling thickness at the target location is calculated based on the mass flow rate delivered by the fouling deposit at the target location.

[0011] In a possible implementation, obtaining the nickel solubility at the target position includes:

[0012] Obtain the mainstream nickel solubility and near-wall nickel solubility at the target location;

[0013] In the case where the near-wall nickel solubility is greater than the mainstream nickel solubility, the mass transfer model is constructed based on the mainstream nickel solubility; otherwise, the mass transfer model is constructed based on the near-wall nickel solubility.

[0014] In a possible implementation, the dirt thickness calculation method further includes:

[0015] Obtain nickel solubility in the downflow system;

[0016] A mass transfer model of the downflow system is constructed based on the nickel solubility of the downflow system and the mass flow rate of the fouling deposition transferred by the downflow system;

[0017] The constructing of a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of the dirt deposits transferred at the target location, and the total release rate of the corrosion products in the coolant system comprises:

[0018] A mass balance model of the coolant system is constructed based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits transferred at the target location, the mass flow rate of fouling deposits transferred in the downstream system, and the total release rate of corrosion products in the coolant system.

[0019] In a possible implementation, the target location includes a reactor core, or the target location includes a reactor core and a steam generator.

[0020] In a possible implementation, the method for calculating the nickel solubility includes:

[0021] Obtaining fluid pH value;

[0022] The nickel solubility is calculated based on the fluid pH.

[0023] In a possible implementation, the calculating the dirt thickness at the target location based on the mass flow rate of the dirt deposited at the target location includes:

[0024] Calculating the mass per unit area of ​​dirt at the target location based on the mass flow rate of dirt deposition transfer at the target location;

[0025] The dirt thickness at the target location is calculated based on the dirt mass per unit area and the dirt density at the target location.

[0026] In a second aspect, the present application provides a device for calculating the fouling thickness of a reactor, comprising:

[0027] A nickel solubility acquisition module, used to acquire the nickel solubility at a target location;

[0028] A mass transfer model building module is used to build a mass transfer model of the target location based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposition transfer at the target location;

[0029] A mass balance model building module, used to build a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of the fouling deposits delivered at the target location, and the total release rate of the corrosion products in the coolant system;

[0030] A mass flow calculation module, used for solving the mass flow of dirt deposition transfer at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system;

[0031] The dirt thickness calculation module is used to calculate the dirt thickness at the target location based on the mass flow rate transmitted by the dirt deposition at the target location.

[0032] In a possible implementation, the dirt thickness calculation device further includes:

[0033] A downstream system calculation module, used for obtaining the nickel solubility of the downstream system, and constructing a mass transfer model of the downstream system based on the nickel solubility of the downstream system and the mass flow rate of the fouling deposition transfer of the downstream system;

[0034] The mass balance model building module is used to build a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits transferred at the target location, the mass flow rate of fouling deposits transferred in the downstream system, and the total release rate of corrosion products in the coolant system.

[0035] In a third aspect, the present application provides a computing device, including:

[0036] at least one processor; and

[0037] At least one memory having instructions stored thereon, which, when executed individually or collectively by the at least one processor, cause the computing device to perform the method according to the first aspect.

[0038] In a fourth aspect, the present application provides a computer storage medium having instructions stored thereon, which, when executed individually or collectively by at least one processor of a computing device, causes the computing device to execute the method described in the first aspect.

[0039] Compared with the prior art, this application has the following advantages:

[0040] The present application obtains the nickel solubility at the target location, constructs a mass transfer model for the target location based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposition transfer at the target location, constructs a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposition transfer at the target location, and the total release rate of corrosion products in the coolant system, solves the mass flow rate of fouling deposition transfer at the target location based on the mass transfer model at the target location and the mass balance model of the coolant system, calculates the fouling thickness at the target location based on the mass flow rate of fouling deposition transfer at the target location, thereby realizing the calculation of the fouling thickness of the reactor, which is helpful for conducting reactor fouling risk analysis, including the study of axial power offset and local cladding corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0042] Figure 1 It is a flow chart of a method for calculating the fouling thickness of a reactor provided in an embodiment of the present application;

[0043] Figure 2 It is a flow chart of another method for calculating the fouling thickness of a reactor provided in an embodiment of the present application;

[0044] Figure 3 It is a structural schematic diagram of a reactor fouling thickness calculation device provided in an embodiment of the present application;

[0045] Figure 4 It is a structural diagram of a computing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0047] As shown in this application, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0048] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0050] In addition, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in this application specification may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0051] Flowcharts are used in this application to illustrate the operations performed by the apparatus or equipment according to the embodiments of the application. It should be understood that the preceding or following operations are not necessarily performed precisely in order. On the contrary, the steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0052] Figure 1FIG. 1 is a flow chart of a method for calculating the fouling thickness of a reactor provided in an embodiment of the present application. Figure 1 As shown, the method for calculating the fouling thickness of the reactor includes the following steps:

[0053] Step S110, obtaining the nickel solubility at the target position.

[0054] The target position includes the core, so as to calculate the fouling thickness of the core. The target position may also include a steam generator, so as to calculate the fouling thickness of the steam generator. The core space is relatively large. For the accuracy of the calculation result, the entire core space may be divided into multiple nodes, and each node may be calculated separately. Similarly, the steam generator may be divided into multiple nodes, and each node may be calculated separately. Accordingly, in the embodiment of the present application, calculation is performed for the target position, which means that calculation is performed for multiple nodes of the divided target position.

[0055] In some embodiments, the method for calculating nickel solubility includes: obtaining a fluid pH value; and calculating nickel solubility based on the fluid pH value. The fluid pH value can be obtained by a table lookup method. In some other embodiments, the nickel solubility can be calculated by an empirical relationship for calculating nickel solubility related to nickel ferrite.

[0056] Step S120: constructing a mass transfer model for the target location based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of dirt deposits transferred at the target location.

[0057] In some embodiments, obtaining the nickel solubility at the target position in step S110 includes: obtaining the mainstream nickel solubility and the near-wall nickel solubility at the target position. When the near-wall nickel solubility is greater than the mainstream nickel solubility, a mass transfer model is constructed based on the mainstream nickel solubility, otherwise, a mass transfer model is constructed based on the near-wall nickel solubility. In this embodiment, the near-wall layer and the mainstream coolant are considered separately, and the corresponding nickel solubilities are calculated respectively, thereby refining the influencing factors of wall deposition.

[0058] Step S130: construct a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of dirt deposits transferred at the target location, and the total release rate of corrosion products in the coolant system.

[0059] In an exemplary embodiment, the mass balance model of the coolant system considers the total release of corrosion products in the coolant system and the fouling mass at the target location, and the relationship is as follows:

[0060] (1)

[0061] Where: m total is the mass of coolant in the coolant system, in kg / m2 ;

[0062] Con is the total concentration of corrosion products in the coolant system, in ppb;

[0063] t is time, in seconds;

[0064] G target The mass flow rate delivered to the target location for dirt deposition, in kg / s·m 2 ;

[0065] G dis is the total release rate of corrosion products in the coolant system, in kg / s·m 2 .

[0066] Among them, m total and G dis is a known parameter and can be input by the user.

[0067] In some embodiments, a mass transfer model of the downstream system may also be constructed, specifically including: obtaining the nickel solubility of the downstream system; constructing the mass transfer model of the downstream system based on the nickel solubility of the downstream system and the mass flow rate of the fouling deposition transfer of the downstream system. Based on the mass transfer model of the downstream system, the mass flow rate of the fouling deposition transfer of the downstream system can be calculated. When constructing the mass balance model, the fouling mass of the downstream system is also considered, that is, the mass balance model of the coolant system is constructed based on the total concentration of corrosion products in the coolant system, the mass flow rate of the fouling deposition transfer at the target position, the mass flow rate of the fouling deposition transfer of the downstream system, and the total release rate of the corrosion products in the coolant system. In this embodiment, when constructing the mass balance model, the fouling mass inside the core, the steam generator, and the downstream system can be considered at the same time, and the positions where fouling is generated and disappears in the first circuit can be fully considered, so that the fouling distribution in the entire circuit is more reasonable and the calculated fouling thickness is more accurate.

[0068] Step S140 : solving the mass flow rate of the dirt deposition transfer at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system.

[0069] Specifically, the mass transfer model at the target location includes two unknown parameters: the total concentration of corrosion products in the coolant system and the mass flow rate of dirt deposition at the target location. The mass balance model of the coolant system also includes two unknown parameters: the total concentration of corrosion products in the coolant system and the mass flow rate of dirt deposition at the target location. The two unknown parameters can be solved by combining the mass transfer model at the target location and the mass balance model of the coolant system, that is, the mass flow rate of dirt deposition at the target location can be solved.

[0070] Step S150: Calculate the dirt thickness at the target location based on the mass flow rate of the dirt deposited at the target location.

[0071] In some embodiments, step S150 includes: calculating the mass per unit area of ​​dirt at the target location based on the mass flow rate of dirt deposition and transfer at the target location; calculating the dirt thickness at the target location based on the mass per unit area of ​​dirt at the target location and the dirt density. In this embodiment, the dirt thickness is directly solved by a given dirt density, and the dirt density at different locations is not considered separately, thereby reducing the amount of calculation.

[0072] The embodiment of the present application constructs a mass transfer model and a mass balance model, calculates the dirt thickness based on the mass transfer model and the mass balance model, and comprehensively considers the factors affecting the dirt deposition thickness, so that the calculation result is more accurate and reasonable.

[0073] In order to better understand the present application, a specific embodiment is further described below. In this specific embodiment, the core, steam generator and downflow system are considered at the same time. It can be understood that in some other embodiments, the arrangement in the reactor loop may be different, and the steam generator and / or downflow system may not be considered, thereby omitting the corresponding calculation steps.

[0074] like Figure 2 As shown, the method for calculating the fouling thickness of the reactor includes the following steps:

[0075] Step S201, calculating the mainstream nickel solubility of the steam generator.

[0076] The nickel solubility can be obtained by solving a function based on the pH value of the fluid, and the pH value of the fluid can be obtained by a table lookup method. In some embodiments, the calculation relationship of the nickel solubility is as follows:

[0077] (2)

[0078] Where: Con Ni is the nickel solubility in ppb;

[0079] PH is the pH value of the fluid;

[0080] a1, a2 and a3 are coefficients, which can be obtained by fitting based on corrosion test data or nuclear power plant operation data.

[0081] The mainstream nickel solubility of the steam generator can be calculated by using the calculation relationship (2) of nickel solubility and the mainstream pH value of the steam generator.

[0082] Step S202: Calculate the nickel solubility near the wall of the steam generator.

[0083] The nickel solubility near the wall of the steam generator can be calculated by using the nickel solubility calculation formula (2) and the pH value of the fluid near the wall of the steam generator: wall .

[0084] In some embodiments, the pH value of the fluid near the wall of the steam generator may be calculated based on the externally input temperature, boron concentration, and lithium concentration of the fluid near the wall of the steam generator. The pH value may also be obtained by a table lookup method.

[0085] Step S203: construct a mass transfer model of the steam generator.

[0086] The mass transfer model of the steam generator is constructed based on the nickel solubility of the steam generator, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposition in the steam generator. In an exemplary embodiment, the mass transfer model of the steam generator considers the mass transfer from the mainstream to the near-wall layer caused by turbulence, the mass transfer from the near-wall layer to the wall caused by deposition, etc., and the relationship is as follows:

[0087] (3)

[0088] Where: Con is the total concentration of corrosion products in the coolant system, in ppb.

[0089] Con wall is the near-wall nickel solubility of the steam generator, in ppb. When the near-wall nickel solubility of the steam generator is greater than the mainstream nickel solubility, the near-wall nickel solubility of the steam generator in equation (3) is equal to the mainstream nickel solubility, that is, the mass transfer model of the steam generator is constructed based on the mainstream nickel solubility of the steam generator.

[0090] F is the factor converting nickel solubility into total concentration.

[0091] is the mass transfer coefficient caused by the mixing of the near-wall layer and the mainstream of the steam generator, in kg / s·m 2 .

[0092] G sed The mass flow rate transferred for the fouling deposition of the steam generator, in kg / s·m 2 .

[0093] Among them, F and is a known parameter that can be input by the user.

[0094] Step S204, calculating the mainstream nickel solubility of the core.

[0095] The pH value of the core mainstream fluid can be calculated based on the externally input core mainstream fluid temperature, boron concentration, and lithium concentration. Combined with the calculation relationship (2) of nickel solubility, the core mainstream nickel solubility can be calculated.

[0096] Step S205, calculating the nickel solubility near the core wall.

[0097] Based on the external input of the fluid temperature, boron concentration, and lithium concentration near the core wall, the pH value of the fluid near the core wall can be calculated. Combined with the calculation relationship of nickel solubility (2), the nickel solubility near the core wall Con can be calculated. wnode .

[0098] Step S206: construct a mass transfer model of the core.

[0099] The mass transfer model of the core is constructed based on the nickel solubility of the core, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposition in the core. In an exemplary embodiment, the mass transfer model of the core considers the mass transfer from the mainstream to the near-wall layer caused by boiling in the core, the mass transfer from the mainstream to the near-wall layer caused by turbulence, and the mass transfer from the near-wall layer to the wall caused by deposition, etc. The relationship is as follows:

[0100] (4)

[0101] Where: is the mass transfer efficiency due to boiling;

[0102] G evap is the mass evaporation rate, in kg / s·m 2 ;

[0103] Con is the total concentration of corrosion products in the coolant system, in ppb;

[0104] Con wnode is the near-wall nickel solubility of the core, in ppb. When the near-wall nickel solubility of the core is greater than the mainstream nickel solubility, the near-wall nickel solubility of the core in equation (4) is equal to the mainstream nickel solubility, that is, the mass transfer model of the core is constructed based on the mainstream nickel solubility of the core.

[0105] F is the factor converting nickel solubility into total concentration.

[0106] is the mass transfer coefficient caused by the mixing of the core near wall layer and the mainstream, in kg / s·m 2 ;

[0107] G node The mass flow rate of fouling deposition in the core, in kg / s·m 2 .

[0108] in, , G evap , and F are known parameters and can be input by the user.

[0109] Step S207: construct a mass transfer model of the downstream system.

[0110] First, the nickel solubility of the downstream system is obtained. Then, a mass transfer model of the downstream system is constructed based on the nickel solubility of the downstream system and the mass flow rate of the fouling deposition transferred by the downstream system. In an exemplary embodiment, the fluid pH value of the downstream system can be calculated based on the external input of the fluid temperature, boron concentration, and lithium concentration of the downstream system. Combined with the calculation relationship (2) of the nickel solubility, the nickel solubility of the downstream system can be calculated. ld The mass transfer model of the downflow system is expressed as follows:

[0111] (5)

[0112] Where: G ld The mass flow rate of dirt deposits in the downstream system, in kg / s·m 2 ;

[0113] G sld is the discharge flow rate, in kg / s·m 2 ;

[0114] Con ld is the nickel solubility in the downstream system, in ppb;

[0115] F p is the particle removal rate;

[0116] F s is the solute removal rate.

[0117] Among them, G sld 、F p and F s is a known parameter and can be input by the user.

[0118] Step S208: construct a mass balance model of the coolant system.

[0119] A mass balance model of the coolant system is constructed based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits transferred by the steam generator, the mass flow rate of fouling deposits transferred by the core, the mass flow rate of fouling deposits transferred by the downflow system, and the total release rate of corrosion products in the coolant system. In an exemplary embodiment, the mass balance model of the coolant system considers the fouling mass removal of the downflow system, the total release of corrosion products in the coolant system, the fouling mass in the steam generator, and the fouling mass inside the core, and the relationship is as follows:

[0120] (6)

[0121] Where: m total is the mass of coolant in the coolant system, in kg / m 2 ;

[0122] Con is the total concentration of corrosion products in the coolant system, in ppb;

[0123] t is time, in seconds;

[0124] G node The mass flow rate of fouling deposition in the core, in kg / s·m 2 ;

[0125] G sed The mass flow rate transferred for the fouling deposition of the steam generator, in kg / s·m 2 ;

[0126] G ld The mass flow rate of dirt deposition in the downstream system, in kg / s·m2;

[0127] G dis is the total release rate of corrosion products in the coolant system, in kg / s·m 2 .

[0128] Among them, m total and G dis is a known parameter and can be input by the user.

[0129] Step S209: Calculate the mass flow rate of dirt deposition transfer.

[0130] Based on the mass transfer model of the steam generator, the mass transfer model of the core, the mass transfer model of the downflow system and the mass balance model of the coolant system, the mass flow rate of the fouling deposition transfer of the steam generator and the mass flow rate of the fouling deposition transfer of the core are solved. That is, the combined relationship (3), (4), (5) and (6) can be solved to obtain G node and G sed In some embodiments, Con can also be solved.

[0131] Step S210: Calculate the dirt thickness.

[0132] The fouling thickness can be calculated based on the mass flow rate of fouling deposition transfer calculated in step S209. In some embodiments, the fouling mass per unit area can be calculated based on the mass flow rate of fouling deposition transfer, and then the fouling thickness can be calculated based on the fouling mass per unit area and the fouling density. Exemplarily, the fouling thickness of the steam generator can be calculated using equations (7) and (8).

[0133] m sg =G sed dt (7)

[0134] (8)

[0135] Where: m sg The unit area mass of dirt in the steam generator, in kg / m 2 ;

[0136] G sed The mass flow rate transferred for the fouling deposition of the steam generator, in kg / s·m 2 ;

[0137] t is time, in seconds;

[0138] THC sg is the dirt thickness of the steam generator, in m;

[0139] is the dirt density, in kg / m 3 .

[0140] The core fouling thickness can be calculated using equations (9) and (10).

[0141] m node =G node dt (9)

[0142] (10)

[0143] Where: m node is the mass per unit area of ​​core dirt, in kg / m 2 ;

[0144] G node The mass flow rate of fouling deposition in the core, in kg / s·m 2 ;

[0145] t is time, in seconds;

[0146] THCnode is the thickness of the core fouling, in m;

[0147] is the dirt density, in kg / m 3 .

[0148] When constructing the mass transfer model, the embodiments of the present application take into account the inflow and outflow of coolant and corrosion products in the near-wall coolant layer; the effects of turbulent mixing and boiling circulation, which cause mass transfer; the dissolution and deposition of dirt on the wall; and the increase or decrease of corrosion products in the coolant. These processes make the process of dirt deposition from the mainstream coolant to the wall more detailed and the mass transfer process more accurate.

[0149] Figure 3 1 is a schematic diagram of the structure of a reactor fouling thickness calculation device provided in an embodiment of the present application. The reactor fouling thickness calculation device is used to implement the reactor fouling thickness calculation method of the above embodiment. Figure 3 As shown, the fouling thickness calculation device 300 for a reactor includes a nickel solubility acquisition module 310, a mass transfer model construction module 320, a mass balance model construction module 330, a mass flow calculation module 340 and a fouling thickness calculation module 350, wherein:

[0150] The nickel solubility acquisition module 310 is used to acquire the nickel solubility of the target position. The target position may include the core, or may include positions such as the core and the steam generator where the fouling thickness needs to be calculated. In some embodiments, acquiring the nickel solubility of the target position includes: acquiring the mainstream nickel solubility and the near-wall nickel solubility of the target position. When the near-wall nickel solubility is greater than the mainstream nickel solubility, a mass transfer model is constructed based on the mainstream nickel solubility, otherwise, a mass transfer model is constructed based on the near-wall nickel solubility.

[0151] The mass transfer model building module 320 is used to build a mass transfer model at the target location based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of scale deposits transferred at the target location.

[0152] The mass balance model building module 330 is used to build a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits delivered at the target location, and the total release rate of corrosion products in the coolant system.

[0153] The mass flow calculation module 340 is used to solve the mass flow rate transferred by the fouling deposition at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system.

[0154] The dirt thickness calculation module 350 is used to calculate the dirt thickness at the target location based on the mass flow rate of dirt deposition and transmission at the target location. Exemplarily, calculating the dirt thickness at the target location based on the mass flow rate of dirt deposition and transmission at the target location includes: calculating the dirt unit area mass at the target location based on the mass flow rate of dirt deposition and transmission at the target location; calculating the dirt thickness at the target location based on the dirt unit area mass and dirt density at the target location.

[0155] In some embodiments, the fouling thickness calculation device 300 for a reactor further includes a downflow system calculation module 360. The downflow system calculation module 360 ​​is used to obtain the nickel solubility of the downflow system, and to construct a mass transfer model of the downflow system based on the nickel solubility of the downflow system and the mass flow rate of fouling deposition transferred by the downflow system. The mass balance model construction module 330 is also used to construct a mass balance model of the coolant system based on the mass flow rate of fouling deposition transferred by the downflow system.

[0156] In some embodiments, the method for calculating nickel solubility by the nickel solubility acquisition module 310 and the fouling thickness calculation module 350 includes: obtaining a fluid pH value; and calculating nickel solubility based on the fluid pH value.

[0157] Figure 4 Schematic diagram of a computing device provided in an embodiment of the present application. Figure 4 As shown, computing device 400 includes one or more processors 410 , one or more memories 420 coupled to processor 410 , and one or more communication modules 440 coupled to processor 410 .

[0158] The communication module 440 is used for two-way communication. The communication module 440 has at least one antenna to facilitate communication. The communication interface may represent any interface necessary for communicating with other network elements.

[0159] Processor 410 may be of any type suitable for the local technology network, and may include, as non-limiting examples, one or more of: a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Computing device 400 may have multiple processors, such as application specific integrated circuit chips, which are driven in time to a clock that synchronizes a master processor.

[0160] The memory 420 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, read-only memory (ROM) 424, electrically programmable read-only memory (EPROM), flash memory, hard disk, compact disk (CD), digital video disk (DVD), and other magnetic and / or optical memories. Examples of volatile memories include, but are not limited to, random access memory (RAM) 422 and other volatile memories that do not persist during the duration of a power outage.

[0161] The computer program 430 includes computer executable instructions that are executed by the associated processor 410. The computer program 430 may be stored in the ROM 424. The processor 410 may perform any suitable actions and processes by loading the computer program 430 into the RAM 422.

[0162] The embodiments of the present application can be implemented by a computer program 430, so that the computing device 400 can execute the reference Figure 1 or Figure 2 Any process disclosed in the discussion. The embodiments of the present application may also be implemented by hardware or by a combination of software and hardware.

[0163] In some embodiments, computer program 430 may be tangibly embodied in a computer-readable medium, which may be contained in computing device 400 (e.g., memory 420) or other storage devices accessible to computing device 400. Computing device 400 may load computer program 430 from the computer-readable medium to RAM 422 for execution. Computer-readable medium may include any type of tangible non-volatile memory, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. Computer program 430 is stored on the computer-readable medium.

[0164] Generally, various embodiments of the present application may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be performed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present application are shown and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that, as non-limiting examples, the blocks, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general hardware or controllers or other computing devices, or some combination thereof.

[0165] The present application also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer executable instructions, such as instructions included in program modules, which are executed in a device on a target real or virtual processor to perform the above-mentioned reference Figure 1 or Figure 2 The method described. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. In various embodiments, the functions of program modules can be combined or separated between program modules as needed. Machine executable instructions for program modules can be executed in local or distributed devices. In distributed devices, program modules can be located in local and remote storage media.

[0166] The program code for executing the method of the present application can be written in any combination of one or more programming languages. These program codes can be provided to a processor or controller of a general-purpose computer, a special-purpose computer or other programmable data processing equipment so that when the program code is executed by the processor or controller, the function / operation specified in the flow chart and / or the block diagram is realized. The program code can be executed completely on the machine as an independent software package, partially on the machine, partially on the machine, partially on a remote machine, partially on a remote machine, or all on a remote machine or server.

[0167] In the context of this application, computer program codes or related data may be carried by any appropriate carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of carriers include signals, computer readable media, etc.

[0168] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or apparatuses, or any suitable combination of the foregoing. More specific examples of computer readable storage media include an electrical connection having one or more conductors, a portable computer floppy 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 foregoing.

[0169] In addition, although the operations are described in a specific order, this should not be construed as requiring to perform these operations in the specific order or sequence shown, or to perform all the operations shown, to obtain the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, although several specific implementation details are included in the above discussion, these details should not be interpreted as limiting the scope of the application, but can be interpreted as a description of the specific features of a particular embodiment. Some of the features described in the context of a separate embodiment may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0170] Although the present application has been described in language specific to structural features and / or methodological acts, it should be understood that the present application defined in the appended claims is not necessarily limited to the specific features or acts described above. Instead, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method for calculating the fouling thickness of a reactor, characterized in that: include: Obtain nickel solubility at target location; A mass transfer model for the target location is constructed based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposits transferred at the target location; constructing a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits delivered at the target location, and the total release rate of corrosion products in the coolant system; Solving the mass flow rate of fouling deposit transfer at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system; The fouling thickness at the target location is calculated based on the mass flow rate delivered by the fouling deposit at the target location.

2. The method according to claim 1, characterized in that The obtaining of nickel solubility at the target position comprises: Obtain the mainstream nickel solubility and near-wall nickel solubility at the target location; In the case where the near-wall nickel solubility is greater than the mainstream nickel solubility, the mass transfer model is constructed based on the mainstream nickel solubility; otherwise, the mass transfer model is constructed based on the near-wall nickel solubility.

3. The method according to claim 1, characterized in that Also includes: Obtain nickel solubility in the downflow system; A mass transfer model of the downflow system is constructed based on the nickel solubility of the downflow system and the mass flow rate of the fouling deposition transferred by the downflow system; The constructing of a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of the dirt deposits transferred at the target location, and the total release rate of the corrosion products in the coolant system comprises: A mass balance model of the coolant system is constructed based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits transferred at the target location, the mass flow rate of fouling deposits transferred in the downstream system, and the total release rate of corrosion products in the coolant system.

4. The method according to any one of claims 1 to 3, characterized in that The target location includes a reactor core, or the target location includes a reactor core and a steam generator.

5. The method according to any one of claims 1 to 3, characterized in that The calculation method of the nickel solubility includes: Obtaining fluid pH value; The nickel solubility is calculated based on the fluid pH.

6. The method according to any one of claims 1 to 3, characterized in that The step of calculating the dirt thickness at the target location based on the mass flow rate of the dirt deposits at the target location comprises: Calculating the mass per unit area of ​​dirt at the target location based on the mass flow rate of dirt deposition transfer at the target location; The dirt thickness at the target location is calculated based on the dirt mass per unit area and the dirt density at the target location.

7. A device for calculating the fouling thickness of a reactor, characterized in that: include: A nickel solubility acquisition module, used to acquire the nickel solubility at a target location; A mass transfer model building module is used to build a mass transfer model of the target location based on the nickel solubility at the target location, the total concentration of corrosion products in the coolant system, and the mass flow rate of fouling deposition transfer at the target location; A mass balance model building module, used to build a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of the fouling deposits delivered at the target location, and the total release rate of the corrosion products in the coolant system; A mass flow calculation module, used for solving the mass flow of dirt deposition transfer at the target location based on the mass transfer model of the target location and the mass balance model of the coolant system; The dirt thickness calculation module is used to calculate the dirt thickness at the target location based on the mass flow rate transmitted by the dirt deposition at the target location.

8. The device according to claim 7, characterized in that Also includes: A downstream system calculation module, used for obtaining the nickel solubility of the downstream system, and constructing a mass transfer model of the downstream system based on the nickel solubility of the downstream system and the mass flow rate of the fouling deposition transfer of the downstream system; The mass balance model building module is used to build a mass balance model of the coolant system based on the total concentration of corrosion products in the coolant system, the mass flow rate of fouling deposits transferred at the target location, the mass flow rate of fouling deposits transferred in the downstream system, and the total release rate of corrosion products in the coolant system.

9. A computing device, characterized in that: include: at least one processor; as well as At least one memory having instructions stored thereon, which, when executed individually or collectively by the at least one processor, cause the computing device to perform the method according to any one of claims 1 to 6.

10. A computer storage medium, characterized in that: The computer storage medium stores instructions, which, when executed individually or collectively by at least one processor of a computing device, cause the computing device to perform the method according to any one of claims 1 to 6.

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