Method and system for calculating thickness of fireproof coating of steel structure transformer substation

Abstract

The invention discloses a method and system for calculating the thickness of a fireproof coating of a steel structure transformer substation, and belongs to the technical field of fire safety engineering. The method comprises the following steps: constructing a temperature rise curve of the steel structure transformer substation, and taking a temperature rise curve corresponding to the most unfavorable working condition as an environment temperature curve; a heat balance differential equation of the fireproof coating is constructed, the environment temperature curve is introduced into the heat balance differential equation, and a steel component temperature equation is determined; wherein the steel member temperature equation introduces intermediate parameters of a referring section shape coefficient, a fire-proof coating heat conductivity coefficient and a fire-proof coating thickness; and obtaining a section shape coefficient value and a fireproof coating heat conduction coefficient value, determining a corresponding intermediate parameter value by using the critical temperature of the steel member, and determining a fireproof coating thickness value according to the intermediate parameter value, the section shape coefficient value and the fireproof coating heat conduction coefficient value. And the problem that the building performance is not considered in the existing fireproof coating thickness design is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fire safety engineering, and in particular to a method and system for calculating the thickness of a fireproof coating of a steel structure substation. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] Steel substations are key nodes for power transmission and are classified as Class I or Class II fire-resistant industrial buildings, making fire protection design particularly important. Existing fire protection designs for steel substations often use the standard temperature rise curve specified in the code to design the thickness of the fireproof coating. This fixed curve is generally suitable for small structures.

[0004] However, steel structure substations are high-space steel structures, and the main building material is steel, which has good thermal conductivity but poor fire resistance.

[0005] In the event of a fire, a fire in a tall, large structure cannot spread to all combustible materials within the room and generally cannot cause a flashover throughout the entire space. Furthermore, fires in tall, large structures typically occur within a limited area, affecting only the air temperature within and adjacent to that area. Furthermore, fires in large spaces exhibit a certain degree of stratification. In addition to the direct impact of the underlying flames on the air, the upper smoke also influences the spatial temperature through radiation and other means. Therefore, the temperature field of a fire in a tall, large structure differs significantly from that of a fire indoors in a typical building. Standard temperature rise curves are not suitable for calculating the temperature of a fire in a tall, large steel substation. Consequently, the accuracy of fire retardant coating thickness calculations for steel substations requires improvement.

[0006] In addition, the actual structure of the steel structure substation is not taken into consideration during the design of the existing standard temperature rise curve, and its applicability needs to be improved. Summary of the Invention

[0007] In order to address the deficiencies of the prior art, the present invention provides a method, system, electronic device, computer-readable storage medium, and computer program product for calculating the thickness of the fire-retardant coating of a steel structure substation. The method simulates the temperature rise and temperature distribution conditions in combination with the structural form and materials of the steel structure substation, determines the thickness of the fire-retardant coating, and facilitates the fire protection design and analysis of the substation.

[0008] In a first aspect, the present invention provides a method for calculating the thickness of fire retardant coatings in steel structure substations;

[0009] A method for calculating the thickness of fire retardant coating of a steel structure substation, comprising:

[0010] Construct the temperature rise curve of the steel structure substation, and take the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve;

[0011] Constructing a thermal balance differential equation for the fire retardant coating, introducing the ambient temperature curve into the thermal balance differential equation, and determining the temperature equation for the steel component; wherein the temperature equation for the steel component introduces intermediate parameters representing the cross-sectional shape coefficient, the thermal conductivity of the fire retardant coating, and the thickness of the fire retardant coating;

[0012] Obtain the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the thickness value of the fire retardant coating based on the intermediate parameter value, the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating.

[0013] In some embodiments, constructing the temperature rise curve of the steel structure substation specifically includes: determining structural parameters and material parameters of the steel structure substation and inputting them into fluid mechanics calculation software for simulation to obtain the temperature rise curve of the steel structure substation.

[0014] In some embodiments, the thermal balance differential equation for constructing the fire retardant coating is specifically as follows: the thermal balance differential equation for the fire retardant coating is determined based on the temperature of the steel component, the ambient temperature, the cross-sectional shape coefficient of the steel component under thermal conditions, the thermal conductivity of the fire retardant coating, the thickness of the fire retardant coating, the density of the steel and the specific heat of the steel.

[0015] In some embodiments, the ambient temperature curve is represented by:

[0016]

[0017] Where s represents time and T represents ambient temperature.

[0018] In some embodiments, the heat balance differential equation is expressed as:

[0019]

[0020] Where, T s represents the temperature of the steel component, T represents the ambient temperature, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, ρ s Indicates the density of steel, c s represents the specific heat of steel, and F / V represents the cross-sectional shape coefficient of the steel member under thermal conditions.

[0021] In some embodiments, the steel component temperature equation is expressed as:

[0022]

[0023] Where A represents the reference parameter, B represents the intermediate parameter, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, and F / V represents the cross-sectional shape coefficient of the steel structure under thermal conditions.

[0024] In a second aspect, the present invention provides a fire retardant coating thickness calculation system for a steel structure substation;

[0025] A fire retardant coating thickness calculation system for a steel structure substation, comprising:

[0026] The temperature rise curve construction module is configured to: construct a temperature rise curve for the steel structure substation, with the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve;

[0027] The thermal balance prediction module is configured to: construct a thermal balance differential equation for the fire retardant coating, introduce the ambient temperature curve into the thermal balance differential equation, and determine a temperature equation for the steel component; wherein the temperature equation for the steel component introduces intermediate parameters representing the cross-sectional shape coefficient, the thermal conductivity of the fire retardant coating, and the thickness of the fire retardant coating;

[0028] The fire retardant coating thickness calculation module is configured to: obtain the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the fire retardant coating thickness value based on the intermediate parameter value, the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value.

[0029] In a third aspect, the present invention provides an electronic device;

[0030] An electronic device includes a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of a steel structure substation.

[0031] In a fourth aspect, the present invention provides a computer-readable storage medium;

[0032] A computer-readable storage medium stores a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of a steel structure substation.

[0033] In a fifth aspect, the present invention provides a computer program product;

[0034] A computer program product includes a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of a steel structure substation.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The technical solution provided by the present invention, based on the characteristics of the tall and large spatial structure of the steel structure substation, considers factors such as its structure and materials to determine the actual temperature rise curve of the steel structure substation, which is close to the actual application scenario of the steel structure substation.

[0037] 2. The technical solution provided by the present invention can simulate the temperature rise and temperature distribution of a steel structure substation under fire, and based on this, design the thickness of the fireproof layer to improve the fireproof performance of the steel structure substation, and can be used to evaluate the design level of fireproof coatings of similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] Figure 1 A schematic flow chart of a method for calculating the thickness of a fire retardant coating for a steel structure substation provided by an embodiment of the present invention;

[0040] Figure 2 An example diagram of a structural model of a steel structure substation provided by an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the structural exterior wall of a steel structure substation provided by an embodiment of the present invention;

[0042] Figure 4 This is an example diagram of the temperature rise curve of a structural column at different fire source distances and heights under the numerical simulation provided by an embodiment of the present invention;

[0043] Figure 5 An example diagram of a temperature rise curve for a steel structure substation provided by an embodiment of the present invention;

[0044] Figure 6 This is an example diagram of the fire retardant coating thickness design curve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0045] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0048] Example 1

[0049] Next, combine Figures 1-6 , a method for calculating the thickness of a fire retardant coating of a steel structure substation disclosed in this embodiment is described in detail. The method for calculating the thickness of a fire retardant coating of a steel structure substation includes:

[0050] S1. Construct a temperature rise curve for the steel structure substation, and take the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve.

[0051] Specifically, the structural parameters (such as the number of floors, floor height, structural composition, layout, etc.), material parameters, heat release rate and other data of the steel structure substation are obtained and input into the fluid dynamics calculation software Fire Dynamic Simulator (FDS) to obtain the temperature rise curve of the steel structure substation.

[0052] For example, a steel-structured substation with a voltage level of 220 kV has its main transformer located outside the distribution equipment building. The building's exterior dimensions are 54 m long, 13 m wide, and 17.2 m high (excluding the steel columns that hang the cables beyond the main structure). The structure utilizes box-type steel columns and hot-rolled H-beams. The exterior walls are clad in aluminum-magnesium-manganese composite panels, while the interior walls are constructed of light steel-framed fire-resistant gypsum board. The horizontal column spacing is 8 m, with a maximum vertical spacing of 8 m. Beams and columns are appropriately spaced closer to the right ancillary function room. The substation has a first-floor height of 6.0 m, and a second-floor height of 9.9 m. The first floor is divided into three independent areas by two fire-resistant partition walls. The second floor has no interior walls, providing a larger open space for equipment. The building's interior features functional areas such as the distribution equipment room, secondary equipment room, and data room, and is equipped with ventilation facilities. The main material parameters are shown in the table below.

[0053] Table 1 Main material parameters

[0054]

[0055] Doors, windows and louvered vents are all set for natural ventilation, giving the surface an "OPEN" property.

[0056] Based on the principle of the most unfavorable fire scenario, simulating the worst-case potential impact of equipment failure or combustible material fire on the building structure, the fire source was located near the middle steel column in the middle area of ​​the substation's first floor. The fire source was a 1-meter cube with its base abutting the first-floor slab. The remaining five surfaces, excluding the base, served as heat release sources.

[0057] The heat release rate Q adopts the t2 fire model, that is, Q = αt 2The fire growth coefficient is selected according to the Technical Standards for Smoke Prevention and Exhaust Systems in Buildings as the rapid fire type α = 0.044kW / s2.

[0058] According to the Technical Standards for Building Smoke Prevention and Exhaust Systems, the heat release rate of a fire in a substation building reaches 8MW when it reaches a steady state.

[0059] By inputting the above data into the fluid dynamics calculation software FDS, the temperature rise curve of the steel structure substation can be obtained.

[0060] Here, the temperature rise curve mainly includes two stages. The first stage is the initial stage of the fire, when the air temperature rises sharply and the slope of the curve is large. The second stage is the stable combustion stage, when the fire temperature gradually stabilizes. The fire decline stage after the heat release of the fire source is completed is not considered.

[0061] For example, assuming the room temperature is 20°C, the regression formula of the heating curve is expressed as:

[0062]

[0063] Where L and H represent the distance and vertical height of the fire source (in meters), s represents the time (in seconds), and T 500 It represents the temperature value at 500 seconds. The fire tends to stabilize about 500 seconds after the fire occurs. The temperature field at this stage can be regarded as a stable field.

[0064] Furthermore, the goodness of the fitting formula can be evaluated by the temperature value at the 500th second, and the average absolute value of the error is 8.0%.

[0065]

[0066]

[0067] When the location of the potential fire source is unclear, the temperature rise curve of the most unfavorable working condition (L = 0, H = 5m) is taken as the ambient temperature curve. The ambient temperature curve is expressed as:

[0068]

[0069] Based on this, the ambient temperature curve is made more in line with the actual scenario of the steel structure substation, so that the thickness design of the subsequent fire-retardant coating can cope with different fire conditions.

[0070] S2. Construct the thermal balance differential equation of the fire retardant coating, introduce the ambient temperature curve into the thermal balance differential equation, and determine the temperature equation of the steel component. Specifically include:

[0071] S201. Determine the thermal balance differential equation of the fire retardant coating based on the temperature of the steel component, the ambient temperature, the cross-sectional shape coefficient of the steel component under thermal conditions, the thermal conductivity of the fire retardant coating, the thickness of the fire retardant coating, the density of the steel and the specific heat of the steel.

[0072] Among them, the heat balance differential equation is expressed as:

[0073]

[0074] Where, T s represents the temperature of the steel component, T represents the ambient temperature, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, ρ s Indicates the density of steel, c s represents the specific heat of steel, and F / V represents the cross-sectional shape coefficient of the steel member under thermal conditions.

[0075] The temperature equation of steel components is expressed as:

[0076]

[0077] Where A represents the reference parameter, B represents the intermediate parameter, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, and F / V represents the cross-sectional shape coefficient of the steel structure under thermal conditions.

[0078] S3. Obtain the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the thickness value of the fire retardant coating by combining the intermediate parameter value, the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating.

[0079] Specifically, determine the temperature of the steel component and plot it with time s as the horizontal axis and B value as the vertical axis as shown below: Figure 6 The multiple curves shown are based on the critical temperature T of the steel component. s After finding the B value, the thickness of the fire retardant coating can be calculated using the cross-sectional shape coefficient F / V and the thermal conductivity coefficient λ of the fire retardant coating.

[0080] Here, the cross-sectional shape coefficient is an inherent property of the steel structure component, and the thermal conductivity coefficient of the fire retardant coating is an inherent property of the fire retardant coating.

[0081] Example 2

[0082] This embodiment discloses a fire retardant coating thickness calculation system for a steel structure substation, including:

[0083] The temperature rise curve construction module is configured to: construct a temperature rise curve for the steel structure substation, with the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve;

[0084] The thermal balance prediction module is configured to: construct a thermal balance differential equation for the fire retardant coating, introduce the ambient temperature curve into the thermal balance differential equation, and determine a temperature equation for the steel component; wherein the temperature equation for the steel component introduces intermediate parameters representing the cross-sectional shape coefficient, the thermal conductivity of the fire retardant coating, and the thickness of the fire retardant coating;

[0085] The fire retardant coating thickness calculation module is configured to: obtain the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the fire retardant coating thickness value based on the intermediate parameter value, the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value.

[0086] It should be noted that the aforementioned heating curve construction module, thermal balance prediction module, and fire retardant coating thickness calculation module correspond to the steps in Example 1. The examples and application scenarios implemented by these modules and the corresponding steps are the same, but are not limited to the contents disclosed in Example 1. It should be noted that the aforementioned modules, as part of a system, can be executed in a computer system, such as a set of computer-executable instructions.

[0087] Example 3

[0088] Embodiment 3 of the present invention provides an electronic device, including a memory and a processor, and computer instructions stored in the memory and running on the processor. When the computer instructions are run by the processor, the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of the steel structure substation are completed.

[0089] Example 4

[0090] A fourth embodiment of the present invention provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of a steel structure substation are completed.

[0091] Example 5

[0092] Embodiment 5 of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned method for calculating the thickness of the fire retardant coating of a steel structure substation.

[0093] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device, and a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide the functions for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] The descriptions of the various embodiments in the above embodiments have different focuses. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0097] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for calculating the thickness of fire retardant coating of a steel structure substation, characterized in that: include: Construct the temperature rise curve of the steel structure substation, and take the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve; Constructing a thermal balance differential equation for the fire retardant coating, introducing the ambient temperature curve into the thermal balance differential equation, and determining the temperature equation for the steel component; wherein the temperature equation for the steel component introduces intermediate parameters representing the cross-sectional shape coefficient, the thermal conductivity of the fire retardant coating, and the thickness of the fire retardant coating; Obtain the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the thickness value of the fire retardant coating based on the intermediate parameter value, the cross-sectional shape coefficient value and the thermal conductivity value of the fire retardant coating.

2. The method for calculating the thickness of the fire retardant coating of a steel structure substation according to claim 1, characterized in that: The construction of the temperature rise curve of the steel structure substation specifically includes: determining the structural parameters and material parameters of the steel structure substation and inputting them into fluid mechanics calculation software for simulation to obtain the temperature rise curve of the steel structure substation.

3. The method for calculating the thickness of fire retardant coating of steel structure substation according to claim 1, characterized in that: The thermal balance differential equation for constructing the fire retardant coating is specifically as follows: the thermal balance differential equation for the fire retardant coating is determined based on the temperature of the steel component, the ambient temperature, the cross-sectional shape coefficient of the steel component under thermal conditions, the thermal conductivity of the fire retardant coating, the thickness of the fire retardant coating, the density of the steel and the specific heat of the steel.

4. The method for calculating the thickness of fire retardant coating of a steel structure substation according to claim 1, characterized in that: The ambient temperature curve is expressed as: Where s represents time and T represents ambient temperature.

5. The method for calculating the thickness of fire retardant coating of steel structure substation according to claim 1, characterized in that: The heat balance differential equation is expressed as: Where, T s represents the temperature of the steel component, T represents the ambient temperature, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, ρ s Indicates the density of steel, c s represents the specific heat of steel, and F / V represents the cross-sectional shape coefficient of the steel member under thermal conditions.

6. The method for calculating the thickness of fire retardant coating of a steel structure substation according to claim 1, characterized in that: The temperature equation of the steel component is expressed as: Where A represents the reference parameter, B represents the intermediate parameter, λ represents the thermal conductivity of the fire retardant coating, d represents the thickness of the fire retardant coating, and F / V represents the cross-sectional shape coefficient of the steel structure under thermal conditions.

7. A fire retardant coating thickness calculation system for steel structure substation, characterized in that: include: The temperature rise curve construction module is configured to: construct a temperature rise curve for the steel structure substation, with the temperature rise curve corresponding to the most unfavorable working condition as the ambient temperature curve; The thermal balance prediction module is configured to: construct a thermal balance differential equation for the fire retardant coating, introduce the ambient temperature curve into the thermal balance differential equation, and determine a temperature equation for the steel component; wherein the temperature equation for the steel component introduces intermediate parameters representing the cross-sectional shape coefficient, the thermal conductivity of the fire retardant coating, and the thickness of the fire retardant coating; The fire retardant coating thickness calculation module is configured to: obtain the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value, use the critical temperature of the steel component to determine the corresponding intermediate parameter value, and determine the fire retardant coating thickness value based on the intermediate parameter value, the cross-sectional shape coefficient value and the fire retardant coating thermal conductivity value.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method for calculating the thickness of the fire retardant coating of a steel structure substation according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instruction is executed by a processor, the steps of the method for calculating the thickness of the fire retardant coating of a steel structure substation described in any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the steps of the method for calculating the thickness of the fire retardant coating of a steel structure substation described in any one of claims 1 to 6 are implemented.

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