Generator hydrogen leakage monitoring method, device and equipment based on CFD simulation and medium

Abstract

The invention relates to a CFD simulation-based generator hydrogen leakage monitoring method, device and equipment and a medium, and belongs to the field of generator hydrogen leakage monitoring. The method comprises the following steps: presetting a monitoring period to carry out continuous hydrogen leakage monitoring on a generator, obtaining real-time data of the generator in the monitoring period, obtaining a hydrogen leakage risk index according to the real-time data of the generator, constructing a hydrogen leakage risk evaluation model, and outputting hydrogen leakage risk evaluation information, the generator real-time data comprises the top hydrogen concentration, the water level of a water tank, the cold water flow of the generator, the gas pressure in the generator, the gas temperature in the generator and the inflation volume; when the hydrogen leakage high-risk information is output, a hydrogen leakage prediction instruction is sent to the terminal, a hydrogen leakage prediction model is constructed through CFD simulation, and the predicted hydrogen leakage condition of the subsequent monitoring period is obtained according to the hydrogen leakage prediction model. Whether the generator leaks hydrogen or not is judged according to multiple standards, the hydrogen leakage trend in a period of time in the future is predicted, and the hydrogen leakage phenomenon can be eliminated in time.

Description

Technical Field

[0001] The present invention belongs to the technical field of generator hydrogen leakage monitoring, and in particular relates to a generator hydrogen leakage monitoring method, device, equipment and medium based on CFD simulation. Background Art

[0002] Hydrogen leakage in generators will bring serious safety hazards, not only affecting the normal operation of the generator, but also may bring a series of dangerous consequences. Hydrogen leakage in generators will cause the hydrogen pressure to drop, thus affecting the output of the generator and reducing its working efficiency; hydrogen leakage may cause excessive hydrogen humidity, which in turn causes water or oil to enter the generator, damaging the insulation performance of the generator stator and rotor windings, and in severe cases may even cause phase-to-phase or ground short circuit accidents; hydrogen is a flammable and explosive gas. When it reaches a certain concentration (4%-75.6%) in the air, it is very easy to explode when encountering a fire source; hydrogen and air are mixed to form a flammable gas. When the hydrogen concentration reaches the explosion limit, any spark may cause a fire; although hydrogen itself is non-toxic, in a high concentration environment, it will reduce the oxygen content in the air and may cause suffocation of personnel; hydrogen leakage not only poses a threat to equipment and personal safety, but also pollutes the environment.

[0003] At present, the method of placing a hydrogen leakage detection sensor on the top of the water tank is mostly used to detect engine hydrogen leakage. However, when the water level rises, the gas in the upper part of the water tank is compressed, and the concentration flowing through the hydrogen leakage detection sensor gradually increases and reaches the upper limit of the sensor. When the water level drops, the concentration of external air flowing through the hydrogen leakage detection sensor gradually decreases. What is finally detected is the hydrogen concentration in the air. The hydrogen leakage concentration varies from zero to full scale, and the operating personnel cannot judge the actual hydrogen leakage situation.

[0004] Computational fluid dynamics (CFD) is a discipline that uses computer technology to solve fluid flow problems. Since the 1960s, with the development of computer technology and numerical computing technology, CFD has developed rapidly. The core of CFD simulation is to establish mathematical models of fluid flow and heat transfer processes, and use numerical calculation methods to solve these models to obtain parameters such as fluid velocity field and temperature field. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a generator hydrogen leakage monitoring method, device, equipment and medium based on CFD simulation.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A generator hydrogen leakage monitoring method based on CFD simulation, the implementation of the generator hydrogen leakage monitoring method comprises the following steps:

[0008] Perform continuous hydrogen leakage monitoring on the generator during a preset monitoring period, obtain real-time data of the generator during the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume;

[0009] When the high-risk hydrogen leakage information is output, a hydrogen leakage prediction instruction is sent to the terminal, a hydrogen leakage prediction model is constructed through CFD simulation, and the predicted hydrogen leakage situation of the subsequent monitoring period is obtained according to the hydrogen leakage prediction model.

[0010] Preferably, obtaining a hydrogen leakage risk index according to the real-time data of the generator, constructing a hydrogen leakage risk assessment model and outputting hydrogen leakage risk assessment information comprises:

[0011] According to the hydrogen detection sensor arranged on the upper part of the generator cooling water tank, the top hydrogen concentration flowing through the hydrogen detection sensor during the monitoring period is monitored, and a first hydrogen leakage risk index is obtained in combination with the water level of the water tank;

[0012] Determine the dissolved oxygen concentration of the generator, and obtain a second hydrogen leakage risk index through the real-time data of the generator and the dissolved oxygen concentration of the generator, wherein the dissolved oxygen concentration of the generator includes the dissolved oxygen concentration in the inlet water and the dissolved oxygen concentration in the outlet water;

[0013] The hydrogen leakage risk index is obtained according to the average value of the first hydrogen leakage risk index and the second hydrogen leakage risk index, and the hydrogen leakage risk assessment model is constructed; when the hydrogen leakage risk index is greater than or equal to 60%, the high hydrogen leakage risk information is output; when the hydrogen leakage risk index is greater than or equal to 30% and less than 60%, the low hydrogen leakage risk information is output, and a plan is made to eliminate the fault when the generator is shut down; when the hydrogen leakage risk index is less than 30%, the no hydrogen leakage risk information is output.

[0014] Preferably, the first hydrogen leakage risk index includes:

[0015] A low water level threshold, a high water level threshold and a hydrogen concentration risk concentration threshold are preset. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is 90% to 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 50% to 60%. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is greater than 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 60% to 80%. When the water level of the water tank is between the low water level threshold and the high water level threshold and the top hydrogen concentration is greater than or equal to the When the hydrogen concentration risk concentration threshold is reached, the first hydrogen leakage risk index takes a value of 80% to 90%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index takes a value of 90% to 95%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to 120% of the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index takes a value of 95% to 100%; in other cases, the first hydrogen leakage risk index takes a value of 0%.

[0016] Preferably, the second hydrogen leakage risk index includes:

[0017] Calculate the total hydrogen leakage within a monitoring cycle through the real-time data of the generator;

[0018] The cooling water flow rate of the generator is obtained, and the amount of hydrogen leakage in the water is calculated according to the dissolved oxygen concentration of the generator and the cooling water flow rate of the generator, so as to indicate the amount of hydrogen leakage into the water within a monitoring period;

[0019] The second hydrogen leakage risk index is calculated based on the total hydrogen leakage and the hydrogen leakage in water. The calculation formula is: Where H is the total hydrogen leakage, in cubic meters per cycle, H W is the amount of hydrogen leakage in water, in cubic meters per cycle, and β is the second hydrogen leakage risk index.

[0020] Preferably, the calculation formula for the total hydrogen leakage is: Where V is the inflation volume in cubic meters, T 0 is the absolute temperature of the atmosphere, which is 293K, P 0 is the absolute atmospheric pressure, which is 0.1 MPa, P 1 The gas pressure in the machine at the beginning of the monitoring cycle is expressed in MPa, P 2 The gas pressure in the machine at the end of the monitoring cycle, in MPa, B 1 is the local absolute atmospheric pressure at the beginning of the monitoring period, in MPa, B 2 T is the local absolute atmospheric pressure at the end of the monitoring period, in MPa. 1 is the gas temperature in the machine at the beginning of the monitoring cycle, in degrees Celsius, T2 It is the air temperature in the machine at the end of the monitoring period, in degrees Celsius.

[0021] Preferably, the calculation formula for the amount of hydrogen leakage in water is: Among them, B is the dissolved oxygen concentration in the outlet water, in micrograms per milliliter, A is the dissolved oxygen concentration in the inlet water, in micrograms per milliliter, Δt is the duration of the monitoring period, and Q is the generator cooling water flow rate, in cubic meters per hour.

[0022] Preferably, the constructing of a hydrogen leakage prediction model by CFD simulation includes:

[0023] Constructing a generator site geometric model, dividing the generator site geometric model into N simulation grids, where the areas of the simulation grids are equal;

[0024] Determining control equations, wherein the control equations include a mass conservation equation, a momentum conservation equation, an energy conservation equation, a component equation, and a turbulence model equation;

[0025] Setting boundary conditions, operating environment, and solution algorithms, wherein the boundary conditions include inlet and outlet boundary conditions and generator internal conditions, wherein the inlet and outlet boundary conditions include inlet and outlet turbulence intensity and inlet and outlet mass flow, the generator internal conditions include generator inner wall temperature, the operating environment includes operating temperature and operating humidity, and the solution algorithms include Simple algorithm and PISO algorithm;

[0026] Based on the generator site geometric model, the control equations, the boundary conditions, the operating environment, and the solution algorithm, the hydrogen leakage prediction model is constructed through CFD numerical simulation and a hydrogen mole fraction cross-sectional atlas set is obtained by solution, wherein the time span of adjacent hydrogen mole fraction cross-sectional atlases in the hydrogen mole fraction cross-sectional atlas set is one monitoring cycle;

[0027] According to the hydrogen mole fraction cross-sectional diagram, an average hydrogen mole fraction in each of the simulation grids is obtained, a hydrogen mole fraction threshold is preset, and the hydrogen mole fraction threshold includes a high-risk hydrogen mole fraction, a dangerous hydrogen mole fraction, a critical hydrogen mole fraction, and a safe hydrogen mole fraction; according to the average hydrogen mole fraction and the hydrogen mole fraction threshold, the simulation grid is divided into a high-risk simulation grid, a dangerous simulation grid, a critical simulation grid, and a safe simulation grid, and the number of each is counted;

[0028] When within the three monitoring cycles, that is, when one or more predicted serious hydrogen leakage phenomena appear in the three consecutive hydrogen mole fraction cross-sectional diagrams obtained by prediction and solution, the generator is immediately shut down to detect the hydrogen leakage points, and the predicted serious hydrogen leakage phenomena include that the number of high-risk simulation grids accounts for more than 10% of the total number of grids, the sum of the number of high-risk simulation grids and the dangerous simulation grids accounts for more than 30% of the total number of grids, and the number of safe simulation grids accounts for less than 50% of the total number of grids; when outside the three monitoring cycles, that is, when the fourth hydrogen mole fraction cross-sectional diagram is obtained and thereafter, one or more predicted diffuse hydrogen leakage phenomena appear, the generator is immediately shut down to detect the hydrogen leakage points, and the predicted diffuse hydrogen leakage phenomena include that the number of high-risk simulation grids accounts for more than 20% of the total number of grids, the sum of the number of high-risk simulation grids and the dangerous simulation grids accounts for more than 50% of the total number of grids, and the number of safe simulation grids accounts for less than 40% of the total number of grids; in other cases, fault elimination is planned when the generator is shut down.

[0029] A generator hydrogen leakage monitoring device based on CFD simulation, used to execute the generator hydrogen leakage monitoring method described above, comprising a continuous hydrogen leakage monitoring module and a hydrogen leakage prediction module;

[0030] The continuous hydrogen leakage monitoring module is used to perform continuous hydrogen leakage monitoring on the generator in a preset monitoring period, obtain real-time data of the generator within the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume;

[0031] The hydrogen leakage prediction module is used to send a hydrogen leakage prediction instruction to the terminal when outputting the high risk hydrogen leakage information, construct a hydrogen leakage prediction model through CFD simulation, and obtain the predicted hydrogen leakage situation of the subsequent monitoring period according to the hydrogen leakage prediction model.

[0032] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned generator hydrogen leakage monitoring method based on CFD simulation when executing the program.

[0033] A storage medium containing computer executable instructions, which are used to execute the above-mentioned generator hydrogen leakage monitoring method based on CFD simulation when executed by a computer processor.

[0034] The beneficial effects of the present invention are:

[0035] (1) By comprehensively considering the data obtained by the hydrogen detection sensor and the dissolved oxygen concentration data of the generator, the current hydrogen leakage risk of the generator can be reasonably judged, and the degree of hydrogen leakage in multiple cycles in the future can be predicted, which is conducive to timely eliminating or preventing hydrogen leakage of the generator;

[0036] (2) By directly measuring the dissolved hydrogen concentration in the cooling water, the hydrogen leakage situation and the real-time online change trend of the hydrogen leakage concentration can be quickly captured, providing a basis for judging the safe and economical operation of the generator set and the condition maintenance;

[0037] (3) Comprehensively consider interference factors such as water tank water level changes, water temperature, and atmospheric pressure during the calculation process to avoid interference from these factors that may reduce the accuracy of the results;

[0038] (4) Predicting hydrogen leakage trends through CFD simulation can be achieved in a virtual environment, reducing the need for physical prototypes and thus saving a lot of time and resources; allowing users to easily adjust equipment parameters to study fluid behavior under different conditions. This flexibility makes design optimization easier and helps to achieve a more stable and efficient system; using CFD simulation can reduce safety risks to personnel and equipment. By simulating potential dangerous situations, preventive measures can be taken before they actually occur; CFD simulation is based on physical laws and experimental data and can provide reliable numerical results. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0040] Figure 1 The present invention is a flow chart of the steps of a generator hydrogen leakage monitoring method based on CFD simulation. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0042] The working principle and use process of the present invention:

[0043] See also Figure 1 , a generator hydrogen leakage monitoring method based on CFD simulation, comprising:

[0044] S1: Perform continuous hydrogen leakage monitoring on the generator in a preset monitoring period, obtain real-time data of the generator in the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume;

[0045] S2: When the high-risk hydrogen leakage information is output, a hydrogen leakage prediction instruction is sent to the terminal, a hydrogen leakage prediction model is constructed through CFD simulation, and the predicted hydrogen leakage situation of the subsequent monitoring period is obtained according to the hydrogen leakage prediction model.

[0046] In this embodiment, a hydrogen leakage risk index is obtained according to the real-time data of the generator, a hydrogen leakage risk assessment model is constructed, and hydrogen leakage risk assessment information is output, which can be specifically implemented by the following steps:

[0047] S101: using a hydrogen detection sensor disposed on the upper part of the generator cooling water tank, monitoring the top hydrogen concentration flowing through the hydrogen detection sensor during the monitoring period, and obtaining a first hydrogen leakage risk index in combination with the water level of the water tank;

[0048] S102: Determine the dissolved oxygen concentration of the generator, and obtain a second hydrogen leakage risk index through the real-time data of the generator and the dissolved oxygen concentration of the generator, wherein the dissolved oxygen concentration of the generator includes the dissolved oxygen concentration in the inlet water and the dissolved oxygen concentration in the outlet water;

[0049] S103: The hydrogen leakage risk index is obtained according to the average value of the first hydrogen leakage risk index and the second hydrogen leakage risk index, and the hydrogen leakage risk assessment model is constructed; when the hydrogen leakage risk index is greater than or equal to 60%, the high hydrogen leakage risk information is output; when the hydrogen leakage risk index is greater than or equal to 30% and less than 60%, the low hydrogen leakage risk information is output, and a fault elimination plan is made when the generator is shut down; when the hydrogen leakage risk index is less than 30%, the no hydrogen leakage risk information is output.

[0050] In this embodiment, the first hydrogen leakage risk index is obtained in combination with the water level of the water tank, which can be implemented by the following steps:

[0051] A low water level threshold, a high water level threshold and a hydrogen concentration risk concentration threshold are preset. The hydrogen concentration risk concentration threshold is usually 2%. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is 90% to 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 50% to 60%. At this time, the top hydrogen concentration detected by the hydrogen detection sensor may be the air hydrogen concentration. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is greater than 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 60% to 80%. When the water level of the water tank is between the low water level threshold and the high water level threshold, and the top hydrogen concentration is When the hydrogen concentration is greater than or equal to the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index is 80% to 90%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index is 90% to 95%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to 120% of the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index is 95% to 100%; in other cases, the first hydrogen leakage risk index is 0%. In each case, the value of the first hydrogen leakage risk index increases with the increase of the top hydrogen concentration;

[0052] In this embodiment, the second hydrogen leakage risk index is obtained by using the real-time data of the generator and the dissolved oxygen concentration of the generator, which can be implemented by the following steps:

[0053] S102-1: Calculate the total hydrogen leakage in a monitoring cycle using the real-time data of the generator. The calculation formula is: Where H is the total hydrogen leakage, in cubic meters per cycle, V is the gas filling volume, in cubic meters, T 0 is the absolute temperature of the atmosphere, which is 293K, P 0 is the absolute atmospheric pressure, which is 0.1 MPa, P 1 The gas pressure in the machine at the beginning of the monitoring cycle is expressed in MPa, P 2 The gas pressure in the machine at the end of the monitoring cycle, in MPa, B 1 is the local absolute atmospheric pressure at the beginning of the monitoring period, in MPa, B 2 T is the local absolute atmospheric pressure at the end of the monitoring period, in MPa. 1 is the gas temperature in the machine at the beginning of the monitoring cycle, in degrees Celsius, T 2 is the internal gas temperature at the end of the monitoring period, in degrees Celsius;

[0054] S102-2: Obtain the generator cooling water flow rate, calculate the amount of hydrogen leakage in the water according to the generator dissolved oxygen concentration and the generator cooling water flow rate, and characterize the amount of hydrogen leakage into the water within a monitoring cycle, in cubic meters per cycle, and the calculation formula is: Among them, H W is the amount of hydrogen leakage in water, B is the dissolved oxygen concentration in the outlet water, in micrograms per milliliter, A is the dissolved oxygen concentration in the inlet water, in micrograms per milliliter, Δt is the duration of the monitoring cycle, and Q is the generator cooling water flow rate, in cubic meters per hour;

[0055] S102-3: Calculate the second hydrogen leakage risk index based on the total hydrogen leakage amount and the hydrogen leakage amount in water, and the calculation formula is: Among them, β is the second hydrogen leakage risk index.

[0056] In this embodiment, a hydrogen leakage prediction model is constructed through CFD simulation, which can be implemented through the following steps:

[0057] S201: constructing a generator site geometric model, wherein the generator site geometric model is a geometric model of the site where the generator is located constructed based on engineering drawings and other relevant materials, and dividing the generator site geometric model into N simulation grids, wherein the areas of the simulation grids are equal;

[0058] S202: Determine a control equation, wherein the control equation includes but is not limited to a mass conservation equation, a momentum conservation equation, an energy conservation equation, a component equation, and a turbulence model equation;

[0059] S203: setting boundary conditions, operating environment, and solution algorithm, wherein the boundary conditions include inlet and outlet boundary conditions and generator internal conditions, wherein the inlet and outlet boundary conditions include but are not limited to inlet and outlet turbulence intensity and inlet and outlet mass flow, the generator internal conditions include but are not limited to generator inner wall temperature, etc., the operating environment includes but is not limited to environmental conditions such as operating temperature and humidity, and the solution algorithm includes but is not limited to Simple algorithm and PISO algorithm;

[0060] S204: Based on the generator site geometric model, the control equations, the boundary conditions, the operating environment, and the solution algorithm, the hydrogen leakage prediction model is constructed through CFD numerical simulation and a hydrogen mole fraction cross-sectional atlas set is obtained by solution, wherein the time span of adjacent hydrogen mole fraction cross-sectional atlases in the hydrogen mole fraction cross-sectional atlas set is one monitoring period;

[0061] S205: obtaining an average hydrogen mole fraction in each of the simulation grids according to the hydrogen mole fraction cross-sectional diagram, presetting a hydrogen mole fraction threshold, the hydrogen mole fraction threshold including a high-risk hydrogen mole fraction, a dangerous hydrogen mole fraction, a critical hydrogen mole fraction and a safe hydrogen mole fraction, dividing the simulation grids into high-risk simulation grids, dangerous simulation grids, critical simulation grids and safe simulation grids according to the average hydrogen mole fraction and the hydrogen mole fraction threshold, and counting the numbers of each grid;

[0062] S206: When a predicted serious hydrogen leakage occurs within the three monitoring cycles, that is, when the prediction and solution are started for the three consecutive hydrogen mole fraction cross-sectional diagrams, the generator is immediately shut down to detect the hydrogen leakage point, and the predicted serious hydrogen leakage phenomenon includes that the number of high-risk simulation grids accounts for more than 10% of the total number of grids, the sum of the number of high-risk simulation grids and the number of dangerous simulation grids accounts for more than 30% of the total number of grids, and the number of safe simulation grids accounts for less than 50% of the total number of grids; when a predicted diffuse hydrogen leakage occurs outside the three monitoring cycles, that is, when the fourth hydrogen mole fraction cross-sectional diagram is obtained and thereafter, the generator is immediately shut down to detect the hydrogen leakage point, and the predicted diffuse hydrogen leakage phenomenon includes that the number of high-risk simulation grids accounts for more than 20% of the total number of grids, the sum of the number of high-risk simulation grids and the dangerous simulation grids accounts for more than 50% of the total number of grids, and the number of safe simulation grids accounts for less than 40% of the total number of grids; in other cases, the fault is planned to be eliminated when the generator is shut down.

[0063] A generator hydrogen leakage monitoring device based on CFD simulation, comprising a continuous hydrogen leakage monitoring module and a hydrogen leakage prediction module;

[0064] The continuous hydrogen leakage monitoring module is used to perform continuous hydrogen leakage monitoring on the generator in a preset monitoring period, obtain real-time data of the generator within the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume;

[0065] The hydrogen leakage prediction module is used to send a hydrogen leakage prediction instruction to the terminal when outputting the high risk hydrogen leakage information, construct a hydrogen leakage prediction model through CFD simulation, and obtain the predicted hydrogen leakage situation of the subsequent monitoring period according to the hydrogen leakage prediction model.

[0066] The computer storage medium of the embodiment of the present invention may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. 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 (non-exhaustive list) of computer-readable storage media include: 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 this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device.

[0067] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry 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 a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0068] The program code included on the computer readable medium can be transmitted with any appropriate medium, including but not limited to wireless, electric wire, optical cable, RF, etc., or any suitable combination of the above. The computer program code for performing the operation of the present invention can be written in one or more programming languages ​​or their combinations, and the programming language includes object-oriented programming languages-such as Java, Smalltalk, C++, and also includes conventional procedural programming languages-such as "C" language or similar programming languages. The program code can be executed completely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0069] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A generator hydrogen leakage monitoring method based on CFD simulation, characterized in that: The implementation of the generator hydrogen leakage monitoring method comprises the following steps: Perform continuous hydrogen leakage monitoring on the generator during a preset monitoring period, obtain real-time data of the generator during the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume; When the high-risk hydrogen leakage information is output, a hydrogen leakage prediction instruction is sent to the terminal, a hydrogen leakage prediction model is constructed through CFD simulation, and the predicted hydrogen leakage situation of the subsequent monitoring period is obtained according to the hydrogen leakage prediction model.

2. The generator hydrogen leakage monitoring method according to claim 1, characterized in that: The obtaining of the hydrogen leakage risk index according to the real-time data of the generator, constructing a hydrogen leakage risk assessment model and outputting hydrogen leakage risk assessment information comprises: According to the hydrogen detection sensor arranged on the upper part of the generator cooling water tank, the top hydrogen concentration flowing through the hydrogen detection sensor during the monitoring period is monitored, and a first hydrogen leakage risk index is obtained in combination with the water level of the water tank; Determine the dissolved oxygen concentration of the generator, and obtain a second hydrogen leakage risk index through the real-time data of the generator and the dissolved oxygen concentration of the generator, wherein the dissolved oxygen concentration of the generator includes the dissolved oxygen concentration in the inlet water and the dissolved oxygen concentration in the outlet water; The hydrogen leakage risk index is obtained according to the average value of the first hydrogen leakage risk index and the second hydrogen leakage risk index, and the hydrogen leakage risk assessment model is constructed; when the hydrogen leakage risk index is greater than or equal to 60%, the high hydrogen leakage risk information is output; when the hydrogen leakage risk index is greater than or equal to 30% and less than 60%, the low hydrogen leakage risk information is output, and a plan is made to eliminate the fault when the generator is shut down; when the hydrogen leakage risk index is less than 30%, the no hydrogen leakage risk information is output.

3. The generator hydrogen leakage monitoring method according to claim 2, characterized in that: The first hydrogen leakage risk index includes: A low water level threshold, a high water level threshold and a hydrogen concentration risk concentration threshold are preset. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is 90% to 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 50% to 60%. When the water level of the water tank is lower than the low water level threshold and the top hydrogen concentration is greater than 110% of the air hydrogen concentration, the first hydrogen leakage risk index is 60% to 80%. When the water level of the water tank is between the low water level threshold and the high water level threshold and the top hydrogen concentration is greater than or equal to the When the hydrogen concentration risk concentration threshold is reached, the first hydrogen leakage risk index takes a value of 80% to 90%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index takes a value of 90% to 95%; when the water level of the water tank is higher than the high water level threshold and the top hydrogen concentration is greater than or equal to 120% of the hydrogen concentration risk concentration threshold, the first hydrogen leakage risk index takes a value of 95% to 100%; in other cases, the first hydrogen leakage risk index takes a value of 0%.

4. The generator hydrogen leakage monitoring method according to claim 2, characterized in that: The second hydrogen leakage risk index includes: Calculate the total hydrogen leakage within a monitoring cycle through the real-time data of the generator; The generator cooling water flow rate is obtained, and the amount of hydrogen leakage in the water is calculated according to the generator dissolved oxygen concentration and the generator cooling water flow rate, so as to represent the amount of hydrogen leakage into the water within a monitoring period; The second hydrogen leakage risk index is calculated based on the total hydrogen leakage and the hydrogen leakage in water. The calculation formula is: Where H is the total hydrogen leakage, in cubic meters per cycle, H W is the amount of hydrogen leakage in water, in cubic meters per cycle, and β is the second hydrogen leakage risk index.

5. The generator hydrogen leakage monitoring method according to claim 4, characterized in that: The calculation formula of the total hydrogen leakage is: Among them, V is the inflation volume in cubic meters, T0 is the absolute atmospheric temperature, which is 293K, P0 is the absolute atmospheric pressure, which is 0.1 MPa, P1 is the gas pressure in the machine at the beginning of the monitoring period, in MPa, P2 is the gas pressure in the machine at the end of the monitoring period, in MPa, B1 is the local atmospheric absolute pressure at the beginning of the monitoring period, in MPa, B2 is the local atmospheric absolute pressure at the end of the monitoring period, in MPa, T1 is the gas temperature in the machine at the beginning of the monitoring period, in degrees Celsius, and T2 is the gas temperature in the machine at the end of the monitoring period, in degrees Celsius.

6. The generator hydrogen leakage monitoring method according to claim 4, characterized in that: The calculation formula for the amount of hydrogen leakage in water is: Among them, B is the dissolved oxygen concentration in the outlet water, in micrograms per milliliter, A is the dissolved oxygen concentration in the inlet water, in micrograms per milliliter, Δt is the duration of the monitoring period, and Q is the generator cooling water flow rate, in cubic meters per hour.

7. The generator hydrogen leakage monitoring method according to claim 1, characterized in that: The hydrogen leakage prediction model constructed by CFD simulation includes: Constructing a generator site geometric model, dividing the generator site geometric model into N simulation grids, where the areas of the simulation grids are equal; Determining control equations, wherein the control equations include a mass conservation equation, a momentum conservation equation, an energy conservation equation, a component equation, and a turbulence model equation; Setting boundary conditions, operating environment, and solution algorithms, wherein the boundary conditions include inlet and outlet boundary conditions and generator internal conditions, wherein the inlet and outlet boundary conditions include inlet and outlet turbulence intensity and inlet and outlet mass flow, the generator internal conditions include generator inner wall temperature, the operating environment includes operating temperature and operating humidity, and the solution algorithms include Simple algorithm and PISO algorithm; Based on the generator site geometric model, the control equations, the boundary conditions, the operating environment, and the solution algorithm, the hydrogen leakage prediction model is constructed through CFD numerical simulation and a hydrogen mole fraction cross-sectional atlas set is obtained by solution, wherein the time span of adjacent hydrogen mole fraction cross-sectional atlases in the hydrogen mole fraction cross-sectional atlas set is one monitoring cycle; According to the hydrogen mole fraction cross-sectional diagram, an average hydrogen mole fraction in each of the simulation grids is obtained, a hydrogen mole fraction threshold is preset, and the hydrogen mole fraction threshold includes a high-risk hydrogen mole fraction, a dangerous hydrogen mole fraction, a critical hydrogen mole fraction, and a safe hydrogen mole fraction; according to the average hydrogen mole fraction and the hydrogen mole fraction threshold, the simulation grid is divided into a high-risk simulation grid, a dangerous simulation grid, a critical simulation grid, and a safe simulation grid, and the number of each is counted; When within the three monitoring cycles, that is, when one or more predicted serious hydrogen leakage phenomena appear in the three consecutive hydrogen mole fraction cross-sectional diagrams obtained by prediction and solution, the generator is immediately shut down to detect the hydrogen leakage points, and the predicted serious hydrogen leakage phenomena include that the number of high-risk simulation grids accounts for more than 10% of the total number of grids, the sum of the number of high-risk simulation grids and the dangerous simulation grids accounts for more than 30% of the total number of grids, and the number of safe simulation grids accounts for less than 50% of the total number of grids; when outside the three monitoring cycles, that is, when the fourth hydrogen mole fraction cross-sectional diagram is obtained and thereafter, one or more predicted diffuse hydrogen leakage phenomena appear, the generator is immediately shut down to detect the hydrogen leakage points, and the predicted diffuse hydrogen leakage phenomena include that the number of high-risk simulation grids accounts for more than 20% of the total number of grids, the sum of the number of high-risk simulation grids and the dangerous simulation grids accounts for more than 50% of the total number of grids, and the number of safe simulation grids accounts for less than 40% of the total number of grids; in other cases, fault elimination is planned when the generator is shut down.

8. A generator hydrogen leakage monitoring device, characterized in that: The device is applied to the generator hydrogen leakage monitoring method as claimed in any one of claims 1 to 7, comprising a continuous hydrogen leakage monitoring module and a hydrogen leakage prediction module; The continuous hydrogen leakage monitoring module is used to perform continuous hydrogen leakage monitoring on the generator in a preset monitoring period, obtain real-time data of the generator within the monitoring period, obtain a hydrogen leakage risk index according to the real-time data of the generator, construct a hydrogen leakage risk assessment model and output hydrogen leakage risk assessment information, wherein the hydrogen leakage risk assessment information includes high hydrogen leakage risk information, low hydrogen leakage risk information and no hydrogen leakage risk information, and the real-time data of the generator includes top hydrogen concentration, water tank water level, generator cooling water flow, gas pressure inside the machine, gas temperature inside the machine, and inflation volume; The hydrogen leakage prediction module is used to send a hydrogen leakage prediction instruction to the terminal when outputting the high risk hydrogen leakage information, build a hydrogen leakage prediction model through CFD simulation, and obtain the predicted hydrogen leakage situation of the subsequent monitoring period according to the hydrogen leakage prediction model.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the generator hydrogen leakage monitoring method as described in any one of claims 1-7 is implemented.

10. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the generator hydrogen leakage monitoring method as described in any one of claims 1-7 when executed by a computer processor.

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