Method for determining heat release rate per unit area and related method and related device

Abstract

The application discloses a unit area heat release rate determination method and a related method and related equipment thereof, and relates to the technical field of nuclear industry. The unit area heat release rate determination method is used for a target solvent and comprises the following steps: obtaining an initial unit area heat release rate of the target solvent in an initial state, an initial combustion duration of the target solvent in the initial state, and a target combustion duration of the target solvent in a target state, the target solvent being in an inverted cone shape in a combustion process; and determining a target unit area heat release rate of the target solvent in the target state according to the initial unit area heat release rate, the initial combustion duration and the target combustion duration. According to the embodiment of the application, the influence of the initial combustion duration and the target combustion duration on the target unit area heat release rate is fully considered, and thus the accuracy of determination of the target unit area heat release rate can be improved.

Description

Technical Field

[0001] This application belongs to the field of nuclear industry technology, specifically relating to a method for determining the heat release rate per unit area, as well as related methods and equipment. Background Technology

[0002] Some post-processing plants and other facilities contain numerous rooms with process equipment. Taking the equipment rooms in post-processing plants as an example, these rooms often have high radioactivity levels and contain large amounts of flammable organic solvents, posing a significant fire hazard. To accurately describe the development of a fire and its impact on items within the equipment rooms, fire simulations are necessary. Inputting fire simulation parameters such as the Heat Release Rate per Unit Area (HRRPUA) is crucial for the accuracy of the fire simulation.

[0003] In existing technologies, a fixed heat release rate per unit area is typically assigned to the liquid surface of flammable organic solvents in rooms such as equipment rooms. However, to ensure timely drainage of leaked liquid from the bottom in the event of a flammable organic solvent leak in such a room, the bottom surface of the equipment room is not horizontal. That is, as the flammable organic solvent burns in the room, the liquid surface of the flammable organic solvent changes, leading to a significant difference between the actual heat release rate per unit area in the later stages of a fire simulation and the fixed heat release rate per unit area. Therefore, existing technologies suffer from low accuracy in determining the heat release rate per unit area. Summary of the Invention

[0004] The technical problem to be solved by this application is to address the above-mentioned deficiencies in the prior art by providing a method for determining the heat release rate per unit area, as well as related methods and equipment. The heat release rate per unit area determined by this method fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of determining the target heat release rate per unit area.

[0005] In a first aspect, embodiments of this application provide a method for determining the heat release rate per unit area, for a target solvent, comprising:

[0006] The initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state are obtained. The target solvent is inverted cone shape during combustion.

[0007] The target heat release rate per unit area of ​​the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time.

[0008] In some embodiments of the first aspect, determining the target heat release rate per unit area of ​​the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time includes:

[0009] Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state;

[0010] Formula (1) includes:

[0011] HRRPUA = (1-t / t0) 2 ×HRRPUA0 (1)

[0012] Wherein, HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area.

[0013] In some embodiments of the first aspect, obtaining the initial combustion time of the target solvent in its initial state includes:

[0014] Obtain the initial heat release rate of the target solvent under initial conditions, and the heat release amount when the target solvent is completely burned;

[0015] Substituting the initial heat release rate and heat release amount into formula (2) for calculation, the initial combustion time t0 of the target solvent in the initial state is obtained;

[0016] Formula (2) includes:

[0017] t0=3Q / HRR0 (2)

[0018] Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

[0019] In some embodiments of the first aspect, obtaining the initial heat release rate of the target solvent in an initial state includes:

[0020] Obtain the initial surface area of ​​the target solvent in its initial state;

[0021] Substituting the initial heat release rate per unit area and the initial surface area of ​​the liquid surface into formula (3) for calculation, the initial heat release rate HRR0 of the target solvent in the initial state is obtained;

[0022] HRR0=HRRPUA0×S0 (3)

[0023] Where HRRPUA0 represents the initial heat release rate per unit area; S0 represents the initial surface area of ​​the liquid.

[0024] In some embodiments of the first aspect, obtaining the heat release during complete combustion of the target solvent includes:

[0025] Obtain the total mass and calorific value of the target solvent;

[0026] Substitute the total mass and calorific value into formula (4) to calculate the heat release Q when the target solvent is completely burned;

[0027] Q = m × q (4)

[0028] Where m represents the total mass and q represents the calorific value.

[0029] In some embodiments of the first aspect, the target solvent takes the shape of an inverted quadrangular pyramid during combustion.

[0030] Based on the same inventive concept, in a second aspect, embodiments of this application also provide a method for generating a heat release rate curve, comprising:

[0031] Obtain the burn duration of multiple targets;

[0032] For each target combustion time, the target unit area heat release rate corresponding to the target combustion time is determined according to the method for determining the unit area heat release rate in any of the first aspects, and multiple target unit area heat release rates are obtained.

[0033] A heat release rate curve is generated based on the combustion duration of multiple targets and the heat release rate per unit area of ​​multiple targets.

[0034] In some embodiments of the second aspect, a heat release rate curve is generated based on multiple target combustion durations and multiple target heat release rates per unit area, including:

[0035] Input multiple target combustion times and multiple target heat release rates per unit area into the target software to generate heat release rate curves;

[0036] The target software includes at least one of fire dynamics simulation software and fire dynamics modeling software.

[0037] Based on the same inventive concept, in a third aspect, embodiments of this application provide a fire simulation method, including:

[0038] A heat release rate curve is generated according to the heat release rate curve generation method in the second aspect.

[0039] The target model is built using the target software, and the initial surface area of ​​the target solvent is set in the target model;

[0040] Based on the heat release rate curve and the initial surface area of ​​the liquid surface, multiple target heat release rates are determined to simulate fire using multiple target heat release rates.

[0041] Based on the same inventive concept, in a fourth aspect, embodiments of this application provide a device for determining the heat release rate per unit area for a target solvent, comprising:

[0042] The first acquisition module is used to acquire the initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state. The target solvent is in the shape of an inverted cone during combustion.

[0043] The first determining module, connected to the first acquiring module, is used to determine the target heat release rate per unit area of ​​the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time.

[0044] In some embodiments of the fourth aspect, the first determining module is specifically used for:

[0045] Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state;

[0046] Formula (1) includes:

[0047] HRRPUA=(1-t / t0) 2 ×HRRPUA0 (1)

[0048] Wherein, HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area.

[0049] In some embodiments of the fourth aspect, the first acquisition module includes:

[0050] The first acquisition submodule is used to acquire the initial heat release rate of the target solvent in the initial state, and the heat release amount when the target solvent is completely burned.

[0051] The first calculation submodule, connected to the first acquisition submodule, is used to substitute the initial heat release rate and heat release amount into formula (2) for calculation to obtain the initial combustion time t0 of the target solvent in the initial state;

[0052] Formula (2) includes:

[0053] t0=3Q / HRR0 (2)

[0054] Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

[0055] Based on the same inventive concept, in a fifth aspect, embodiments of this application provide a heat release rate curve generation apparatus, comprising:

[0056] The second acquisition module is used to acquire the burning time of multiple targets;

[0057] The second determining module, connected to the second obtaining module, is used to determine the target unit area heat release rate corresponding to each target combustion time according to the unit area heat release rate determination method in any one of the first aspects, and obtain multiple target unit area heat release rates.

[0058] The first generation module, connected to the second determination module, is used to generate a heat release rate curve based on multiple target combustion durations and multiple target heat release rates per unit area.

[0059] Based on the same inventive concept, in a sixth aspect, embodiments of this application provide a fire simulation device, comprising:

[0060] The second generation module is used for the heat release rate curve generation method of the second aspect to generate a heat release rate curve.

[0061] The building module, connected to the second generation module, is used to build the target model using the target software and set the initial surface area of ​​the target solvent in the target model;

[0062] The third determination module, connected to the construction module, is used to determine multiple target heat release rates based on the heat release rate curve and the initial surface area of ​​the liquid surface, so as to conduct fire simulation through multiple target heat release rates.

[0063] According to the method for determining the heat release rate per unit area and related methods and equipment provided in the embodiments of this application, the target heat release rate per unit area of ​​the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. This fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of determining the target heat release rate per unit area.

[0064] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0065] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the embodiments of the present disclosure to explain the disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0066] Figure 1 This is a schematic diagram of the HRRPUA and time progression settings page in PyroSim software.

[0067] Figure 2 This illustration shows a flowchart of a method for determining the heat release rate per unit area provided in an embodiment of this application.

[0068] Figure 3 This illustration shows a flowchart of a method for generating a heat release rate curve according to an embodiment of this application.

[0069] Figure 4 This illustration shows a flowchart of a fire simulation method provided in an embodiment of this application;

[0070] Figure 5 This is a schematic diagram of a device for determining the heat release rate per unit area provided in an embodiment of this application;

[0071] Figure 6 This is a schematic diagram of a heat release rate curve generation device provided in an embodiment of this application;

[0072] Figure 7 This diagram illustrates a structural schematic of a fire simulation device provided in an embodiment of this application. Detailed Implementation

[0073] To enable those skilled in the art to better understand the technical solutions of this disclosure, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments of this disclosure to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0074] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0075] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0076] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Words such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0077] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined herein.

[0078] To better understand the method for determining the heat release rate per unit area provided in the embodiments of this application, before introducing Embodiment 1, the prior art that may be involved in the embodiments of this application will be introduced below.

[0079] Through extensive research, the inventors discovered the following main problems when setting HRRPUA parameters for rooms such as equipment rooms:

[0080] To ensure timely drainage of leaked flammable organic solvents in equipment rooms and similar spaces, existing technologies do not design the bottom of these rooms as a horizontal plane, but rather slope it towards the drain from the four edges of the bottom. In this configuration, if a flammable organic solvent leaks, the solvent will accumulate at the bottom of the room in an inverted cone shape, such as an inverted quadrangular pyramid.

[0081] In the aforementioned scenario, if a fire occurs in a room such as an equipment room, as the flammable organic solvent burns, it is gradually consumed, causing the liquid level of the flammable organic solvent to drop continuously. Consequently, the surface area of ​​the flammable organic solvent shrinks, leading to a decrease in the heat release rate from this surface. However, commonly used fire simulation software, such as PyroSim, cannot simulate the evolution of models of flammable organic solvents and other combustible materials, and therefore cannot model the decrease in the liquid level and surface area of ​​the flammable organic solvent.

[0082] Taking PyroSim software as an example, its control over the fire combustion rate is achieved by inputting the HRRPUA of combustible organic solvents and other combustibles, and then calculating the Heat Release Rate (HRR) based on the surface area of ​​the combustibles in the model, thereby simulating the overall fire development in rooms such as equipment rooms. For most liquid fire scenarios, the solvent's accumulation pattern is consistent across both the upper and lower surfaces, so the error introduced by this simulation method is negligible. However, in rooms such as equipment rooms, due to the larger angle of the inverted cone, the surface area of ​​the combustible organic solvent changes significantly as combustion progresses.

[0083] The conventional method for setting fire simulation parameters in existing technologies is to simply assign an HPPPUA to the upper surface of the flammable organic solvent, and then the PyroSim software calculates an HRR based on the upper surface of the flammable material model. However, such fire simulation parameter settings can lead to a significant increase in the HRR in the later stages of the fire simulation compared to the actual situation, while the total burning time becomes shorter, resulting in a large error in the fire simulation.

[0084] To better understand the heat release rate per unit area provided in the embodiments of this application, the inventor's research process will be introduced before introducing Embodiment 1.

[0085] Through extensive research, the inventor discovered that, for example Figure 1 As shown, software such as PyroSim includes an interface for setting the relationship between HRRPUA and time, allowing users to easily configure this relationship. This enables the simulation of the functional relationship between HRRPUA and time, influenced by fuel characteristics at different stages of a fire. Building upon this, the inventors envision combining the aforementioned functions of PyroSim software with fire scenarios involving combustible materials in rooms such as equipment rooms to improve the simulation of fires involving flammable organic solvents in such rooms.

[0086] Specifically, for software such as PyroSim, the surface area of ​​the combustible model cannot evolve in real time as the fire simulation progresses. However, considering that HRR satisfies formula (5), and that changing HRRPUA and changing the surface area S of the target liquid surface are completely equivalent for formula (5), if the surface area S of the target liquid surface cannot be changed, HRRPUA can be changed. Therefore, although in reality the surface area of ​​the liquid surface changes with time, rather than HRRPUA, if real-time adjustment of HRR is required, fire simulation parameters can be set for HRRPUA to allow it to change over time.

[0087] HRR=HRRPUA×S (5)

[0088] Based on the above analysis, the problem now becomes finding the correspondence between the target liquid surface area S and the target combustion time t. Since the change in the target liquid surface area S is actually caused by the drop in liquid level, it is directly related to the height of the liquid surface from the bottom. According to geometric relationships, the target liquid surface area S under the target combustion time t can satisfy formula (6).

[0089] S / S0=(h / h0) 2 (6)

[0090] Where S0 can represent the initial surface area of ​​the liquid surface, that is, the surface area of ​​the liquid surface in the initial state; h0 can represent the initial liquid height, that is, the liquid height in the initial state; and h can represent the target liquid height, that is, the liquid height in the target state.

[0091] The following describes a method for determining the heat release rate per unit area provided in an embodiment of this application.

[0092] Example 1

[0093] Figure 2 This illustration shows a flowchart of a method for determining the heat release rate per unit area provided in an embodiment of this application.

[0094] The execution subject of the method for determining the heat release rate per unit area provided in this application embodiment can be an electronic device or a device for determining the heat release rate per unit area, etc. In other words, the method for determining the heat release rate per unit area provided in this application embodiment can be executed by an electronic device or a device for determining the heat release rate per unit area, etc. The following description uses an electronic device as the execution subject as an example.

[0095] The method for determining the heat release rate per unit area provided in this application can be used for target solvents. More specifically, it can be used for target solvents in equipment rooms of reprocessing plants in the nuclear industry, and also for target solvents in rooms of other plants in the nuclear industry. The target solvent can be any flammable organic solvent.

[0096] It should be noted that the equipment room in the reprocessing plant has a higher level of radioactivity compared to other rooms in the plant.

[0097] like Figure 2 As shown, the method for determining the heat release rate per unit area provided in this application embodiment includes steps S210 to S220.

[0098] S210. Obtain the initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state. The target solvent is inverted cone shape during combustion.

[0099] S220. Determine the target heat release rate per unit area of ​​the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time.

[0100] According to the method for determining the heat release rate per unit area provided in the embodiments of this application, the target heat release rate per unit area of ​​the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. This method fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of determining the target heat release rate per unit area.

[0101] The specific implementation methods for each of the above steps are described below.

[0102] In step S210, the initial combustion time can be the initial combustion time of the target solvent.

[0103] The initial state can be the state after the initial combustion time of the target solvent.

[0104] The initial heat release rate per unit area can be the heat release rate per unit area of ​​the target solvent in its initial state.

[0105] The target combustion time can be the sum of the time for the target solvent to burn again after the initial combustion time and the initial combustion time, that is, the total combustion time of the target solvent at a certain moment.

[0106] The target state can be the state of the target solvent after the initial combustion time and then after a second combustion for the target combustion time.

[0107] The volume of the target solvent is inverted cone shape during combustion, and the initial combustion time can be determined by the volume relationship between the cone and the cube.

[0108] In some examples, the target solvent takes on an inverted square pyramid shape during combustion. That is, the volume of the target solvent forms an inverted square pyramid shape during combustion.

[0109] In other examples, the target solvent takes the shape of an inverted cylinder, or an inverted triangular pyramid, an inverted pentagonal pyramid, or other inverted polygonal pyramids during combustion. That is, the volume of the target solvent takes the shape of an inverted cylinder, or an inverted triangular pyramid, an inverted pentagonal pyramid, or other inverted polygonal pyramids during combustion.

[0110] HRRPUA0 is an intrinsic characteristic of the target solvent, which can be determined experimentally or pre-stored in electronic devices for later direct retrieval; no limitation is made here.

[0111] In some implementations, obtaining the initial combustion time of the target solvent in its initial state may include:

[0112] Obtain the initial heat release rate of the target solvent under initial conditions, and the heat release amount when the target solvent is completely burned;

[0113] Substituting the initial heat release rate and heat release amount into formula (2) for calculation, the initial combustion time t0 of the target solvent in the initial state is obtained;

[0114] Formula (2) includes:

[0115] t0=3Q / HRR0 (2)

[0116] Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

[0117] In this embodiment, by substituting the initial heat release rate and heat release amount into formula (2) for calculation, the initial combustion time t0 of the target solvent in the initial state can be determined quickly and accurately.

[0118] The combustion time t' of the solvent and the heat release Q' when the solvent is completely burned satisfy the formula (7).

[0119] t'=Q' / HRR' (7)

[0120] HRR' represents the heat release rate of the solvent.

[0121] It should be noted that, in this embodiment, the initial combustion time t0 can be calculated by replacing the cone with a cube of the same height and base area. Since the volume of a cube of the same height and base area is three times that of a cone, the heat release of a cube of the same height and base area is three times that of a cone. Therefore, the initial combustion time is the ratio of three times the heat release of the target solvent to the initial heat release.

[0122] In some implementations, obtaining the initial heat release rate of the target solvent in its initial state includes:

[0123] Obtain the initial surface area of ​​the target solvent in its initial state;

[0124] Substituting the initial heat release rate per unit area and the initial surface area of ​​the liquid surface into formula (3) for calculation, the initial heat release rate HRR0 of the target solvent in the initial state is obtained;

[0125] HRR0=HRRPUA0×S0 (3)

[0126] Where HRRPUA0 represents the initial heat release rate per unit area; S0 represents the initial surface area of ​​the liquid.

[0127] In this embodiment, by substituting the initial heat release rate per unit area and the initial surface area of ​​the liquid surface into formula (3) for calculation, the initial heat release rate HRR0 of the target solvent in the initial state can be determined quickly and accurately.

[0128] The surface area of ​​the initial liquid surface can be the bottom area of ​​the cone corresponding to the target solvent in the initial state.

[0129] As an example, the initial surface area of ​​the liquid surface is related to the shape of the bottom of the equipment chamber, and can be calculated from the dimensions of the bottom of the equipment chamber.

[0130] As another example, an electronic device may store a preset initial surface area of ​​a liquid, which can then be directly accessed later.

[0131] As another example, the initial surface area of ​​the liquid surface can be obtained in response to a user's input operation based on the initial surface area of ​​the liquid surface on the electronic device. The initial surface area determination operation can be an operation in which the user determines the initial surface area of ​​the liquid surface. For example, the initial surface area input operation can be an operation in which the user enters the initial surface area of ​​the liquid surface in an input box displayed on the electronic device, or an operation in which the user selects to enter the initial surface area of ​​the liquid surface in an option displayed on the electronic device; there is no limitation here.

[0132] In some embodiments, obtaining the heat release during complete combustion of the target solvent includes:

[0133] Obtain the total mass and calorific value of the target solvent;

[0134] Substitute the total mass and calorific value into formula (4) to calculate the heat release Q when the target solvent is completely burned;

[0135] Q = m × q (4)

[0136] Where m represents the total mass and q represents the calorific value.

[0137] In this embodiment, by substituting the total mass and calorific value into formula (4) for calculation, the heat release Q when the target solvent is completely burned can be determined quickly and accurately.

[0138] The total mass can be measured by experiment or pre-stored in electronic devices for later retrieval; no limitation is made here.

[0139] The calorific value is a characteristic of the target solvent itself, which can be measured experimentally or stored in electronic devices for later direct retrieval; no limitation is made here.

[0140] The target burning time can be set according to the actual situation and is not limited here.

[0141] In step S220, after acquiring the initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state, the electronic device can also determine the target heat release rate per unit area of ​​the target solvent in the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time.

[0142] The target heat release rate per unit area can be the heat release rate per unit area of ​​the target solvent under the target state.

[0143] Based on the inventors' extensive research on liquid fires, under the premise that the surface area above and below the liquid is the same, it can reach a stable combustion stage in a short time after ignition and maintain it for a relatively long time. In the stable combustion stage, its heat release rate remains relatively stable, which is related to the state in which the entire liquid surface is vaporized and ignited in the case of a fire. When the surface area of ​​the liquid changes, the heat release rate increases linearly when the surface area increases, and decreases linearly when the surface area decreases. Therefore, we approximate that under any condition, the relationship between the consumption of liquid height and time is linear and has little to do with the surface area of ​​the liquid. Therefore, we can approximately derive formula (8).

[0144] (1-t / t0)=h / h0 (8)

[0145] Substituting formula (8) into formula (6), we get formula (9).

[0146] S / S0=(1-t / t0) 2 (9).

[0147] Since changing HRRPUA and changing the target liquid surface surface S are completely equivalent, and the target liquid surface surface S and the initial liquid surface surface S0 satisfy formula (9), in some embodiments, determining the target unit area heat release rate of the target solvent under the target state based on the initial unit area heat release rate, the initial combustion time, and the target combustion time may include:

[0148] Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state;

[0149] Formula (1) includes:

[0150] HRRPUA=(1-t / t0) 2 ×HRRPUA0 (1)

[0151] Wherein, HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area.

[0152] In this embodiment, by substituting the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) for calculation, the target heat release rate per unit area of ​​the target solvent under the target state can be determined quickly and accurately.

[0153] Understandably, by substituting formulas (2) and (3) into formula (1), we can obtain formula (10).

[0154] HRRPUA=(1-HRRPUA0×S0×t / 3Q) 2 ×HRRPUA0 (10)

[0155] It should be noted that since 1-HRRPUA0×S0×t / 3Q≥0, we can simplify to get t≤3Q / (HRRPUA0×S0) and t≥0. Therefore, the range of t is 0≤t≤3Q / (HRRPUA0×S0).

[0156] Based on the same inventive concept, this application also provides a fire simulation method. The method for generating heat release rate curves provided in this application is described below with reference to the accompanying drawings.

[0157] Example 2

[0158] Figure 3 This illustration shows a flowchart of a method for generating a heat release rate curve provided in an embodiment of this application.

[0159] The heat release rate curve generation method provided in this application can be executed by electronic devices and heat release rate curve generation devices, etc. In other words, the heat release rate curve generation method provided in this application can be executed by electronic devices and heat release rate curve generation devices, etc. The following explanation uses an electronic device as the executing entity.

[0160] like Figure 3 As shown, the heat release rate curve generation method provided in this application embodiment may include steps S310 to S330.

[0161] S310: Obtain the burning duration of multiple targets.

[0162] S320. For each target combustion time, the target unit area heat release rate corresponding to the target combustion time is determined according to the method for determining the unit area heat release rate in any of the embodiments in Example 1, and multiple target unit area heat release rates are obtained.

[0163] S330: Generate heat release rate curves based on multiple target combustion durations and multiple target heat release rates per unit area.

[0164] According to the heat release rate curve generation method provided in the embodiments of this application, the target heat release rate of the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. This method fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of the determination of the target heat release rate per unit area and thus improving the accuracy of the heat release rate curve.

[0165] The specific implementation methods for each of the above steps are described below.

[0166] In step S310, the number of target combustion times is set according to the actual situation and is not limited here. For example, the number of target combustion times can be 2, 3, and 5, etc.

[0167] The burn durations for each of the multiple targets are different.

[0168] The specific value of the target combustion time t can be set according to the actual situation, provided that the target combustion time t satisfies 0≤t≤3Q / (HRRPUA0×S0).

[0169] In step S320, after acquiring multiple target combustion durations, the electronic device can also determine the target unit area heat release rate corresponding to each target combustion duration according to the unit area heat release rate determination method in any one of Embodiment 1, thereby obtaining multiple target unit area heat release rates.

[0170] According to the method for determining the heat release rate per unit area in any of the embodiments in Example 1, the process of determining the target heat release rate per unit area corresponding to the target combustion time can be found in the relevant content of Example 1, and will not be repeated here.

[0171] Understandably, the number of target combustion times is the same as the number of target heat release rates per unit area, and the more target combustion times there are, the more accurate the subsequently generated heat release rate curve will be.

[0172] In step S330, for each target combustion time, the electronic device determines the target unit area heat release rate corresponding to the target combustion time according to the unit area heat release rate determination method in any of Embodiment 1. After obtaining multiple target unit area heat release rates, it can also generate a heat release rate curve based on the multiple target combustion times and the multiple target unit area heat release rates.

[0173] For example, the heat release rate curve may include a curve with the target combustion time on the horizontal axis and the target heat release rate per unit area on the vertical axis.

[0174] In some implementations, a heat release rate curve is generated based on multiple target combustion durations and multiple target heat release rates per unit area, including:

[0175] Input multiple target combustion times and multiple target heat release rates per unit area into the target software to generate heat release rate curves;

[0176] The target software includes at least one of fire dynamics simulation software and fire dynamics modeling software.

[0177] In this embodiment, by inputting multiple target combustion durations and multiple target heat release rates per unit area into the target software, heat release rate curves can be generated quickly and accurately, providing a basis for subsequent fire simulation.

[0178] PyroSim is a professional fire simulation software used to simulate and analyze fires in buildings and other structures. It combines the functionality of Fire Dynamics Simulator (FDS) with a user-friendly graphical interface, allowing users to easily create, edit, and simulate complex fire scenarios.

[0179] Fire Dynamics Simulation (FDS) is an open-source computational fluid dynamics software used to simulate fire behavior and smoke diffusion processes in fire scenarios. Developed by the National Institute of Standards and Technology (NIST), FDS is one of the most widely used fire dynamics simulation tools.

[0180] Based on the same inventive concept, this application also provides a fire simulation method, which will be described below with reference to the accompanying drawings.

[0181] Example 3

[0182] Figure 3 This illustration shows a flowchart of a fire simulation method provided in an embodiment of this application.

[0183] The fire simulation method provided in this application can be executed by electronic devices and fire simulation devices, etc. In other words, the fire simulation method provided in this application can be executed by electronic devices and fire simulation devices, etc. The following explanation uses electronic devices as the executing entity.

[0184] For example, the fire simulation method provided in this application embodiment can simulate a fire in the equipment room of a post-processing plant.

[0185] like Figure 4 As shown, the fire simulation method provided in this application embodiment may include steps S410 to S430.

[0186] S410. Generate a heat release rate curve according to the heat release rate curve generation method of Example 2.

[0187] S420. Use target software to build a target model and set the initial surface area of ​​the target solvent in the target model.

[0188] S430. Based on the heat release rate curve and the initial surface area of ​​the liquid, determine multiple target heat release rates to simulate a fire using multiple target heat release rates.

[0189] According to the fire simulation method provided in this application, the target heat release rate of the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. This fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of the determination of the target heat release rate per unit area and thus improving the accuracy of the heat release rate curve. Based on this, multiple target heat release rates are determined according to the heat release rate curve and the initial surface area of ​​the liquid surface, which can improve the accuracy of the target heat release rate and thus improve the accuracy of the fire simulation.

[0190] The specific implementation methods for each of the above steps are described below.

[0191] In step S410, the heat release rate curve is generated according to the heat release rate curve generation method of Example 2. The process of generating the heat release rate curve can be referred to the relevant content of Example 2, and will not be repeated here.

[0192] In step S420, the target software includes at least one of fire dynamics simulation software and fire dynamics modeling software.

[0193] The target model can be a model of the fire simulation object. For example, in the case of a fire simulation of an equipment room in a post-treatment plant, the target model may include a model of the equipment room. More specifically, in the case of a fire simulation of an equipment room in a post-treatment plant, the target model may include a model of the equipment room itself.

[0194] In step S430, for example, multiple target unit area heat release rates can be selected from the heat release rate curve. For each target unit area heat release rate, the target unit area heat release rate and the initial surface area of ​​the liquid are substituted into formula (5) to calculate the target heat release rate corresponding to the target unit area heat release rate, so as to obtain multiple target heat release rates. Fire simulation is performed in the equipment room using multiple target heat release rates.

[0195] Based on the same inventive concept, this application also provides a device for determining the heat release rate per unit area. The device for determining the heat release rate per unit area provided in this application is described below with reference to the accompanying drawings.

[0196] Example 4

[0197] The device for determining the heat release rate per unit area provided in this application embodiment can be used for target solvents.

[0198] like Figure 5 As shown, the device for determining the heat release rate per unit area provided in this application embodiment may include a first acquisition module 510 and a first determination module 520.

[0199] The first acquisition module 510 can be used to acquire the initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state. The target solvent is in the shape of an inverted cone during combustion.

[0200] The first determining module 520 can be connected to the first acquiring module 510 and can be used to determine the target unit area heat release rate of the target solvent under the target state based on the initial unit area heat release rate, the initial combustion time and the target combustion time.

[0201] The device for determining the heat release rate per unit area provided in the embodiments of this application determines the target heat release rate per unit area of ​​the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. It fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of determining the target heat release rate per unit area.

[0202] In some implementations, the first determining module 520 may be specifically used for:

[0203] Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state;

[0204] Formula (1) includes:

[0205] HRRPUA=(1-t / t0) 2 ×HRRPUA0 (1)

[0206] Wherein, HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area.

[0207] In some implementations, the first acquisition module 510 may include:

[0208] The first acquisition submodule is used to acquire the initial heat release rate of the target solvent in the initial state, and the heat release amount when the target solvent is completely burned.

[0209] The first calculation submodule, connected to the first acquisition submodule, is used to substitute the initial heat release rate and heat release amount into formula (2) for calculation to obtain the initial combustion time t0 of the target solvent in the initial state;

[0210] Formula (2) includes:

[0211] t0=3Q / HRR0 (2)

[0212] Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

[0213] In some implementations, the first acquisition module 510 may include:

[0214] The second acquisition submodule is used to acquire the initial surface area of ​​the target solvent in the initial state.

[0215] The second calculation module is used to substitute the initial heat release rate per unit area and the initial surface area of ​​the liquid surface into formula (3) to calculate the initial heat release rate HRR0 of the target solvent in the initial state.

[0216] HRR0=HRRPUA0×S0 (3)

[0217] Where HRRPUA0 represents the initial heat release rate per unit area; S0 represents the initial surface area of ​​the liquid.

[0218] In some implementations, the first acquisition submodule may be specifically used for:

[0219] Obtain the total mass and calorific value of the target solvent;

[0220] Substitute the total mass and calorific value into formula (4) to calculate the heat release Q when the target solvent is completely burned;

[0221] Q = m × q (4)

[0222] Where m represents the total mass and q represents the calorific value.

[0223] In some implementations, the target solvent takes the shape of an inverted quadrangular pyramid during combustion.

[0224] The device for determining the heat release rate per unit area provided in this application has the beneficial effects and implementation methods of the method for determining the heat release rate per unit area provided in Embodiment 1 of this application. For details, please refer to the specific description of the method for determining the heat release rate per unit area in Embodiment 1 above. This embodiment will not repeat the description here.

[0225] Based on the same inventive concept, this application also provides a heat release rate curve generation device. The heat release rate curve generation device provided in this application is described below with reference to the accompanying drawings.

[0226] Example 5

[0227] like Figure 6 As shown, the heat release rate curve generation device provided in this application embodiment may include a second acquisition module 610, a second determination module 620, and a first generation module 630.

[0228] The second acquisition module 610 can be used to acquire the burning time of multiple targets;

[0229] The second determining module 620 can be connected to the second obtaining module 610 and is used to determine the target unit area heat release rate corresponding to the target combustion time for each target combustion time according to the unit area heat release rate determination method in any one of Embodiment 2, so as to obtain multiple target unit area heat release rates.

[0230] The first generation module 630 can be connected to the second determination module 620 and is used to generate a heat release rate curve based on multiple target combustion times and multiple target heat release rates per unit area.

[0231] According to the heat release rate curve generation device provided in the embodiments of this application, the target heat release rate of the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. The device fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of the determination of the target heat release rate per unit area and thus improving the accuracy of the heat release rate curve.

[0232] In some implementations, the first generation module 630 may be specifically used for:

[0233] Input multiple target combustion times and multiple target heat release rates per unit area into the target software to generate heat release rate curves;

[0234] The target software includes at least one of fire dynamics simulation software and fire dynamics modeling software.

[0235] The heat release rate curve generation device provided in this application has the beneficial effects and implementation methods of the heat release rate curve generation method provided in embodiment 2 of this application. For details, please refer to the specific description of the heat release rate curve generation method in embodiment 2 above. This embodiment will not repeat the description here.

[0236] Based on the same inventive concept, this application also provides a fire simulation device. The fire simulation device provided in this application is described below with reference to the accompanying drawings.

[0237] Example 6

[0238] like Figure 7 As shown, the fire simulation device provided in this application embodiment may include a second generation module 710, a construction module 720, and a third determination module 730.

[0239] The second generation module 710 is used in the heat release rate curve generation method of Embodiment 3 to generate a heat release rate curve.

[0240] The construction module 720 is connected to the second generation module 710 and is used to build a target model using the target software and set the initial surface area of ​​the target solvent in the target model.

[0241] The third determining module 730, connected to the building module 720, is used to determine multiple target heat release rates based on the heat release rate curve and the initial surface area of ​​the liquid surface, so as to simulate a fire using multiple target heat release rates.

[0242] According to the fire simulation method provided in this application, the target heat release rate of the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. This fully considers the influence of the initial combustion time and the target combustion time on the target heat release rate per unit area, thereby improving the accuracy of the determination of the target heat release rate per unit area and thus improving the accuracy of the heat release rate curve. Based on this, multiple target heat release rates are determined according to the heat release rate curve and the initial surface area of ​​the liquid surface, which can improve the accuracy of the target heat release rate and thus improve the accuracy of the fire simulation.

[0243] The fire simulation device provided in this application has the beneficial effects and implementation methods of the fire simulation method provided in embodiment 3 of this application. For details, please refer to the specific description of the fire simulation method in embodiment 3 above. This embodiment will not repeat the description here.

[0244] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A unit area heat release rate determination method for a target solvent, characterized by, include: The initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state are obtained, wherein the target solvent is in the shape of an inverted pyramid during combustion. The target heat release rate of the target solvent under the target state is determined based on the initial heat release rate per unit area, the initial combustion duration, and the target combustion duration; the determination of the target heat release rate of the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion duration, and the target combustion duration includes: Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state; Formula (1) includes: HRRPUA = (1 - t / t0) 2 x HRRPUA0 (1) Where HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area. Obtaining the initial combustion time of the target solvent in the initial state includes: obtaining the initial heat release rate of the target solvent in the initial state, and the heat release amount when the target solvent is completely burned; Substituting the initial heat release rate and the heat release amount into formula (2) for calculation, the initial combustion time t0 is obtained; Formula (2) includes: t0=3Q / HRR0 (2) Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

2. The method according to claim 1, characterized in that, The step of obtaining the initial heat release rate of the target solvent in the initial state includes: Obtain the initial surface area of ​​the target solvent in the initial state; Substituting the initial heat release rate per unit area and the initial surface area of ​​the liquid surface into formula (3) for calculation, the initial heat release rate HRR0 of the target solvent in the initial state is obtained; HRR0=HRRPUA0×S0 (3) Where HRRPUA0 represents the initial heat release rate per unit area; S0 represents the initial surface area of ​​the liquid.

3. The method according to claim 1, characterized in that, Obtaining the heat release during the complete combustion of the target solvent includes: Obtain the total mass of the target solvent and the calorific value of the target solvent; Substitute the total mass and the calorific value into formula (4) to calculate the heat release Q when the target solvent is completely burned; Q = m × q (4) Where m represents the total mass and q represents the calorific value.

4. The method according to claim 1, characterized in that, The target solvent takes the shape of an inverted quadrangular pyramid during combustion.

5. A method for generating a heat release rate curve, characterized in that, include: Obtain the burn duration of multiple targets; For each target combustion duration, the target unit area heat release rate corresponding to the target combustion duration is determined by the unit area heat release rate determination method according to any one of claims 1-4, and multiple target unit area heat release rates are obtained. A heat release rate curve is generated based on the multiple target combustion durations and the multiple target heat release rates per unit area.

6. The method according to claim 5, characterized in that, The step of generating a heat release rate curve based on the multiple target combustion durations and the multiple target heat release rates per unit area includes: Input the multiple target combustion times and the multiple target heat release rates per unit area into the target software to generate heat release rate curves; The target software includes at least one of fire dynamics simulation software and fire dynamics modeling software.

7. A fire simulation method, characterized in that, include: The heat release rate curve generation method according to claim 5 or 6 generates a heat release rate curve; The target model is built using the target software, and the initial surface area of ​​the target solvent is set in the target model; Based on the heat release rate curve and the initial surface area of ​​the liquid surface, multiple target heat release rates are determined to simulate a fire using the multiple target heat release rates.

8. A device for determining the heat release rate per unit area, used for a target solvent, characterized in that, include: The first acquisition module is used to acquire the initial heat release rate per unit area of ​​the target solvent in the initial state, the initial combustion time of the target solvent in the initial state, and the target combustion time of the target solvent in the target state, wherein the target solvent is in the shape of an inverted pyramid during combustion. The first determining module, connected to the first acquiring module, is used to determine the target heat release rate of the target solvent under the target state based on the initial heat release rate per unit area, the initial combustion time, and the target combustion time. The first determining module is specifically used for: Substitute the initial heat release rate per unit area, the initial combustion time, and the target combustion time into formula (1) to calculate the target heat release rate per unit area of ​​the target solvent under the target state; Formula (1) includes: HRRPUA= (1-t / t0) 2 x HRRPUA0 (1) Where HRRPUA represents the target heat release rate per unit area; t represents the target combustion duration; t0 represents the initial combustion duration; and HRRPUA0 represents the initial heat release rate per unit area. The first acquisition module includes: The first acquisition submodule is used to acquire the initial heat release rate of the target solvent in the initial state, and the heat release amount when the target solvent is completely burned; The first calculation submodule, connected to the first acquisition submodule, is used to substitute the initial heat release rate and the heat release amount into formula (2) to calculate the initial combustion time t0. Formula (2) includes: t0=3Q / HRR0 (2) Where Q represents the amount of heat released; HRR0 represents the initial heat release rate.

9. A device for generating a heat release rate curve, characterized in that, include: The second acquisition module is used to acquire the burning time of multiple targets; The second determining module, connected to the second acquiring module, is used to determine the target unit area heat release rate corresponding to the target combustion time for each target combustion time, according to the unit area heat release rate determination method according to any one of claims 1-4, and to obtain multiple target unit area heat release rates. The first generation module, connected to the second determination module, is used to generate a heat release rate curve based on the multiple target combustion durations and the multiple target heat release rates per unit area.

10. A fire simulation device, characterized in that, include: The second generation module is used to generate a heat release rate curve according to the method of claim 5 or 6; The construction module, connected to the second generation module, is used to build a target model using the target software and set the initial surface area of ​​the target solvent in the target model; The third determining module, connected to the construction module, is used to determine multiple target heat release rates based on the heat release rate curve and the initial surface area of ​​the liquid surface, so as to simulate a fire using the multiple target heat release rates.

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