Method and system for verifying performance of fireproof coating in radiation environment

Abstract

The invention discloses a method and a system for verifying the performance of a fireproof coating in a radiation environment. The method comprises the following steps: acquiring the reference heat insulation efficiency of the fireproof coating of a steel structure; manufacturing a steel structure test piece coated with the steel structure fireproof coating; sequentially carrying out an irradiation resistance test and a heat insulation efficiency test on the steel structure test piece to obtain the heat insulation efficiency of the steel structure test piece; according to the heat insulation efficiency of the steel structure test piece and the reference heat insulation efficiency, obtaining heat insulation efficiency attenuation; and evaluating the fire resistance of the steel structure fireproof coating in the radiation environment according to the heat insulation efficiency attenuation. Accurate evaluation of fire resistance and environmental adaptability of the fireproof coating in the radiation environment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of performance testing of fireproof coatings, and particularly to a method and system for verifying the performance of fireproof coatings in a radiation environment. Background Art

[0002] The statements in this part only provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] For the fire protection of steel structures in the radiation control area of nuclear power plants, a spraying scheme of steel structure fireproof coatings is usually adopted; however, in the current method for verifying the performance of steel structure fireproof coatings, the influence of radiation is not considered when verifying the performance of fireproof coatings, and the performance of fireproof coatings in a radiation environment cannot be accurately verified. Furthermore, the fire resistance performance of fireproof coatings cannot be accurately evaluated to meet the requirements of the radiation environment, affecting the protection effect of fireproof coatings in a radiation environment. Summary of the Invention

[0004] To solve the above problems, the present invention proposes a method and system for verifying the performance of fireproof coatings in a radiation environment, realizing an accurate evaluation of the fire resistance performance and adaptability of steel structure fireproof coatings in a radiation environment.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a method for verifying the performance of fireproof coatings in a radiation environment is proposed, including:

[0007] Obtaining the reference heat insulation efficiency of the steel structure fireproof coating;

[0008] Fabricating a steel structure specimen coated with the steel structure fireproof coating;

[0009] Successively performing a radiation resistance test and a heat insulation efficiency test on the steel structure specimen to obtain the heat insulation efficiency of the steel structure specimen;

[0010] Obtaining the heat insulation efficiency attenuation amount according to the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency;

[0011] Evaluating the fire resistance performance of the steel structure fireproof coating in a radiation environment according to the heat insulation efficiency attenuation amount.

[0012] Further, calculating the error between the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency, dividing the error by the reference heat insulation efficiency and expressing it as a percentage to obtain the heat insulation efficiency attenuation amount of the steel structure specimen.

[0013] The steel structure fireproof coating is a coating that has passed the fire resistance limit test. The heat insulation efficiency is expressed by the test time when the average temperature on the back fire surface of the specimen reaches a set value.

[0014] Spray fireproof coating on the anti-corrosion treated steel plate and cure and dry it to obtain a steel structure specimen coated with steel structure fireproof coating. Then, conduct a radiation resistance test on the steel structure specimen; for the steel structure specimen that passes the radiation resistance test, conduct a heat insulation efficiency test to obtain the heat insulation efficiency of the steel structure specimen, and obtain the physical and chemical properties of the steel structure specimen before and after the radiation resistance test.

[0015] When the physical and chemical properties of the steel structure specimen remain unchanged before and after the radiation resistance test, it is determined that the steel structure specimen passes the radiation resistance test.

[0016] When the attenuation amount of heat insulation efficiency is greater than the set threshold, it is determined that the fire resistance performance of the steel structure fireproof coating does not meet the requirements for use in the radiation environment;

[0017] When the attenuation amount of heat insulation efficiency is less than or equal to the set threshold, it is determined that the fire resistance performance of the steel structure fireproof coating meets the requirements for use in the radiation environment.

[0018] Also obtain the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the radiation resistance test, and the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test;

[0019] Based on the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the radiation resistance test, and the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test, obtain the differences in fire resistance test temperature, surface temperature distribution, thermal conductivity and appearance and structure of the expansion layer before and after radiation;

[0020] Evaluate the adaptability of the fireproof coating in the radiation environment based on the differences in fire resistance test temperature, surface temperature distribution, thermal conductivity and appearance and structure of the expansion layer before and after radiation.

[0021] In a second aspect, a performance verification system for fireproof coatings in a radiation environment is proposed, including:

[0022] A data acquisition unit for obtaining the reference heat insulation efficiency of the steel structure fireproof coating and the heat insulation efficiency of the steel structure specimen;

[0023] A heat insulation efficiency attenuation amount determination unit for obtaining the heat insulation efficiency attenuation amount according to the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency;

[0024] A steel structure fireproof coating performance determination unit for evaluating the fire resistance performance of the steel structure fireproof coating in the radiation environment according to the heat insulation efficiency attenuation amount.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The present invention provides a method and system for verifying the performance of fireproof coatings in a radiation environment. The method obtains the reference heat insulation efficiency of the steel structure fireproof coating through a heat insulation efficiency test on the steel structure fireproof coating. Then, a steel structure specimen coated with the steel structure fireproof coating is fabricated. The steel structure specimen is successively subjected to a radiation resistance test and a heat insulation efficiency test to obtain the heat insulation efficiency of the steel structure specimen. Finally, based on the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency, the heat insulation efficiency attenuation amount is obtained. According to the heat insulation efficiency attenuation amount, the fire resistance performance of the steel structure fireproof coating in the radiation environment is evaluated, achieving an accurate evaluation of the fire resistance performance of the fireproof coating in the radiation environment. Through this evaluation result, a suitable steel structure fireproof coating can be selected for application in the radiation environment to ensure that the steel structure fireproof coating can play a normal safety protection role in the radiation environment.

[0027] Advantages of additional aspects of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0029] Figure 1 A flowchart of a method for verifying the performance of fireproof coatings in a radiation environment disclosed in an embodiment;

[0030] Figure 2 An adaptability verification process of fireproof coatings in a radiation environment disclosed in an embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described below in conjunction with the drawings and embodiments.

[0032] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. 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 when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] Without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] Example 1

[0036] For the fire protection of steel structures in the radiation control area of nuclear power plants, the scheme of spraying fireproof coatings on steel structures is usually adopted; at present, there is no corresponding test and evaluation basis for the environmental adaptability and fire resistance of fireproof coatings for steel structures used in the radiation control area of nuclear power plants.

[0037] Generally, there are changes in physical and chemical properties such as color, brittleness, powdering, cracking, blistering, peeling, delamination, and chipping (poor environmental adaptability) and weakening or failure of fire resistance in the use of fireproof coatings for steel structures in the radiation control area of nuclear power plants, which are mainly caused by the radioactive environment in the radiation control area of nuclear power plants. In order to enable the fireproof coatings for steel structures to perform their normal functions in the radiation control area of nuclear power plants, a large amount of manual maintenance and regular updates are required, which not only increases the high cost but also makes implementation difficult, and brings potential safety hazards subsequently.

[0038] In order to evaluate whether the fireproof coating for steel structures meets the requirements of the radiation control area of nuclear power plants and evaluate the performance differences of the fireproof coating for steel structures before and after being used in the radiation control area of nuclear power plants before the fireproof coating for steel structures is used in the radiation control area of nuclear power plants, in this example, a method for verifying the performance of fireproof coatings in a radiation environment is disclosed, as Figure 1 、 Figure 2 shown, including:

[0039] S1: Obtain the reference heat insulation efficiency of the fireproof coating for steel structures.

[0040] In this example, through the heat insulation efficiency test of the fireproof coating for steel structures, the reference heat insulation efficiency of the fireproof coating for steel structures is obtained, and the fireproof coating for steel structures used in this example is a coating that has passed the fire resistance limit test.

[0041] Specifically: conduct a fire resistance limit test on the fireproof coating for steel structures;

[0042] Conduct a reference heat insulation efficiency test on the fireproof coating for steel structures that has passed the fire resistance limit test to obtain the reference heat insulation efficiency of the fireproof coating for steel structures.

[0043] The process of conducting a fire resistance limit test on the fireproof coating for steel structures includes:

[0044] S111: Fabricate a steel beam specimen of the fireproof coating for steel structures for conducting a fire resistance limit test.

[0045] In this example, a 36b hot-rolled I-beam specified in the GB / T706-2016 standard is used as the base material, and the section modulus of this base material is 126 m-1, and the span is 4200 mm.

[0046] After the anti-corrosion treatment of the substrate, spray the steel structure fireproof coating on the anti-corrosion treated substrate according to the construction process to be verified, and carry out curing and drying.

[0047] Among them, the substrate is made in an environment with an ambient temperature of 5 - 35°C and an ambient relative humidity of 50 - 80%.

[0048] The anti-corrosion treatment of the substrate refers to thoroughly removing the rust on the surface of the substrate, and then spraying the anti-corrosion primer on the surface of the substrate, curing and drying; the thickness of the anti-corrosion primer can be 60 - 75um.

[0049] After the anti-corrosion treatment of the substrate, ensure that the surface of the substrate is clean and dry, and then spray the steel structure fireproof coating (including hanging mesh) in multiple passes according to the construction process to be verified, and the dry spray thickness meets the coating thickness for a fire resistance limit of 3 hours.

[0050] Cure and dry the specimens sprayed with the steel structure fireproof coating in an environment with a temperature of 5 - 35°C and a relative humidity of 50 - 80% for a curing time of more than 2 - 3 months; after the specimens of the steel structure fireproof coating on the steel beam are cured and dried, use a film thickness gauge to measure the thickness so that the dry thickness of the steel structure fireproof coating is controlled within the coating thickness for its fire resistance limit of 3 hours.

[0051] S112: According to the GB14907 - 2018 standard, conduct a fire resistance limit test on the fabricated specimens of the steel structure fireproof coating on the steel beam.

[0052] This fire resistance limit test can be a 3-hour fire resistance limit test.

[0053] According to the GB14907 - 2018 standard, judge the fire resistance limit test results of the specimens of the steel structure fireproof coating on the steel beam; when the maximum bending deformation of the specimen after the fire resistance limit test is less than or equal to L02 / 400hmm and the average temperature of the specimen ≤ 538°C, it is determined that the fire resistance limit test results of the specimens of the steel structure fireproof coating on the steel beam are qualified. Among them, L0 is the net span of the specimen, and h is the distance between the compression point and the tension point on the cross-section of the specimen.

[0054] Conduct a reference heat insulation efficiency test on the steel structure fireproof coating with qualified fire resistance limit test results, and the process of obtaining the reference heat insulation efficiency of the steel structure fireproof coating includes:

[0055] S121: Fabricate the heat insulation efficiency specimens for the reference heat insulation efficiency test.

[0056] According to the GB14907-2018 standard, a steel plate with dimensions of 500mm×500mm×6mm is used as the substrate for the heat insulation efficiency test piece. After the steel plate is subjected to anti-corrosion treatment, the steel structure fireproof coating is sprayed in multiple passes according to the construction process of the manufacturer. The dry thickness of the sprayed steel structure fireproof coating is 2000um, and the reference heat insulation efficiency test is carried out after curing and drying.

[0057] The steel plate is made in an environment where the ambient temperature is 5 to 35°C and the ambient relative humidity is 50 to 80%.

[0058] The anti-corrosion treatment of the substrate of the heat insulation efficiency test piece refers to thoroughly removing the rust on the surface of the substrate, and then spraying anti-corrosion primer on the surface of the substrate, curing and drying; the thickness of the anti-corrosion primer can be 60 to 75um.

[0059] After the anti-corrosion treatment of the substrate of the heat insulation efficiency test piece, ensure that the surface of the substrate is clean and dry, and then spray the steel structure fireproof coating (including hanging mesh) in multiple passes according to the construction process to be verified, reaching the dry thickness of 2000um required by the reference heat insulation efficiency test of the GB14907-2018 standard.

[0060] The heat insulation efficiency test piece sprayed with the steel structure fireproof coating is cured and dried in an environment with a temperature of 5 to 35°C and a relative humidity of 50 to 80%; after the heat insulation efficiency test piece is cured and dried, use a film thickness gauge to measure the thickness, so that the dry thickness error of the fireproof coating of the heat insulation efficiency test piece is controlled within ±10%.

[0061] According to the GB14907-2018 standard, the heat insulation efficiency test is carried out on the heat insulation efficiency test piece to obtain the reference heat insulation efficiency of the steel structure fireproof coating.

[0062] Judgment of the reference heat insulation efficiency test result: The result is judged according to the GB14907-2018 standard. The reference heat insulation efficiency of the heat insulation efficiency test piece is expressed by the test time when the average temperature on the back fire surface of the test piece reaches 500°C, and the unit is minutes (min).

[0063] S2: Fabricate a steel structure test piece coated with a steel structure fireproof coating.

[0064] In this embodiment, the fireproof coating is sprayed on the steel plate after anti-corrosion treatment, and cured and dried to obtain a steel structure test piece coated with a steel structure fireproof coating.

[0065] Among them, the dry thickness error of the fireproof coating of the steel structure test piece coated with the steel structure fireproof coating before and after curing and drying is within the set dry thickness error range.

[0066] The fabrication process of the steel structure test piece coated with a steel structure fireproof coating includes:

[0067] According to the GB14907-2018 standard, a steel plate with dimensions of 500mm×500mm×6mm is used as the base material for the steel structure test piece. After the steel plate is subjected to anti-corrosion treatment, the steel structure fireproof coating is sprayed in multiple passes according to the construction process of the manufacturer. The dry thickness of the sprayed steel structure fireproof coating is 2000um. After curing and drying, the irradiation resistance test and the heat insulation efficiency test are carried out in sequence.

[0068] Among them, the base material of the steel structure test piece is made in an environment with an ambient temperature of 5 - 35°C and an ambient relative humidity of 50 - 80%.

[0069] The anti-corrosion treatment of the base material of the steel structure test piece refers to thoroughly removing the rust on the surface of the base material, and then spraying anti-corrosion primer on the surface of the base material and curing and drying it; the thickness of the anti-corrosion primer can be 60 - 75um.

[0070] After the anti-corrosion treatment of the base material of the steel structure test piece, ensure that the surface of the base material is clean and dry. After confirmation, spray the steel structure fireproof coating (including hanging mesh) in multiple passes according to the construction process to be verified, and reach the dry thickness of 2000um required by the GB14907-2018 standard for the reference heat insulation efficiency test.

[0071] The steel structure test piece sprayed with the steel structure fireproof coating is cured and dried in an environment with a temperature of 5 - 35°C and a relative humidity of 50 - 80%; the curing time is 2 - 3 months. After the steel structure test piece is cured and dried, use a film thickness gauge to measure the thickness so that the dry thickness error of the fireproof coating of the steel structure test piece is controlled within ±10%.

[0072] S3: Conduct an irradiation resistance test on the steel structure test piece; for the steel structure test piece that passes the irradiation resistance test, conduct a heat insulation efficiency test to obtain the heat insulation efficiency of the steel structure test piece.

[0073] The heat insulation efficiency is expressed by the test time when the average temperature on the back fire surface of the test piece reaches the set value.

[0074] Obtain the physical and chemical properties of the steel structure test piece before and after the irradiation resistance test;

[0075] When the physical and chemical properties of the steel structure test piece remain unchanged before and after the irradiation resistance test, it is determined that the irradiation resistance test of the steel structure test piece is qualified.

[0076] Conduct an irradiation resistance test on the steel structure test piece according to the ASTM D4082-10(2023) standard and the NB / T20133.3 (procedure a) standard.

[0077] Obtain the physical and chemical properties of the steel structure test piece before and after the irradiation resistance test;

[0078] When the physical and chemical properties of the steel structure test piece remain unchanged before and after the irradiation resistance test, it is determined that the irradiation resistance test of the steel structure test piece is qualified.

[0079] Determination of the results of the radiation resistance test: Refer to the specifications of ASTM D4082-10 (2023) and NB / T 20133.3 (Procedure a) for result determination. If there are no physical and chemical property changes such as color, brittleness, powdering, cracking, blistering, peeling, delamination, and chipping of the steel structure fireproof coating in the irradiation test of the heat insulation efficiency specimen of the steel structure fireproof coating, it is determined that the radiation resistance test of the steel structure specimen is qualified.

[0080] Conduct a heat insulation efficiency test on the steel structure specimen that has passed the radiation resistance test in accordance with the specification of GB14907-2018; obtain the heat insulation efficiency of the steel structure specimen.

[0081] Determination of the results of the heat insulation efficiency test: Make the result determination according to the specification of GB14907-2018. The heat insulation efficiency of the heat insulation efficiency specimen of the steel structure fireproof coating is expressed by the test time when the average temperature on the back fire side of the specimen reaches 500 °C, and the unit is minutes (min).

[0082] S4: Obtain the heat insulation efficiency attenuation amount based on the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency.

[0083] Calculate the error between the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency, divide this error by the reference heat insulation efficiency and express it as a percentage to obtain the heat insulation efficiency attenuation amount of the steel structure specimen.

[0084] The calculation formula for the heat insulation efficiency attenuation amount is:

[0085] θ = (T0 - T) / T0 × 100%

[0086] In the formula: θ is the heat insulation efficiency attenuation amount, T0 is the reference heat insulation efficiency, and T is the heat insulation efficiency of the steel structure specimen; note: when T ≥ T0, it indicates that there is no attenuation of the heat insulation efficiency.

[0087] S5: Evaluate the fire resistance performance of the steel structure fireproof coating in the radiation environment based on the heat insulation efficiency attenuation amount.

[0088] Among them, when the heat insulation efficiency attenuation amount is greater than the set threshold value, it is determined that the fire resistance performance of the steel structure fireproof coating does not meet the use requirements in the radiation environment;

[0089] When the heat insulation efficiency attenuation amount is less than or equal to the set threshold value, it is determined that the fire resistance performance of the steel structure fireproof coating meets the use requirements in the radiation environment.

[0090] The set threshold value can be set according to actual needs, such as 35%. Make the result determination with reference to the specifications of GB14907-2018 and UL2431. After the steel structure fireproof coating passes the radiation resistance test and the heat insulation efficiency test, the heat insulation efficiency attenuation amount meeting the range of ≤ 35% is qualified.

[0091] This embodiment also obtains the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the irradiation resistance test, and compares them with the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test;

[0092] Based on the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the irradiation resistance test, and the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test, the differences in the fire resistance test temperature, surface temperature distribution, thermal conductivity, and appearance and structure of the expansion layer before and after radiation are obtained;

[0093] Based on the differences in the fire resistance test temperature, surface temperature distribution, thermal conductivity, and appearance and structure of the expansion layer before and after radiation, the adaptability of the fireproof coating in the radiation environment is evaluated.

[0094] This embodiment also conducts irradiation resistance tests on the steel structure fireproof coating with different irradiation dose rates and cumulative doses, judges the basic tolerance of the steel structure fireproof coating in the nuclear power plant radiation environment, and then burns the irradiated steel structure specimen to determine the difference in the fire resistance test temperature of the steel structure fireproof coating before and after radiation, and calculates the attenuation amount of the heat insulation efficiency.

[0095] 1. Select the steel structure fireproof coating for different steels (including steel plates, steel beams, and steel columns), and perform irradiation resistance tests with combinations of irradiation dose rates of 0.028 Gy / s - 2.8 Gy / s and cumulative doses of 10 2 -10 7 Gy to judge the basic tolerance of the steel structure fireproof coating in the nuclear power plant radiation environment, and then burn the irradiated steels (including steel plates, steel beams, and steel columns) to determine the difference in the fire resistance test temperature of the steel structure fireproof coating before and after radiation, and calculate the attenuation amount of the heat insulation efficiency. Specifically:

[0096] Select the steel structure fireproof coating for the steel beam and perform an irradiation resistance test with a combination of an irradiation dose rate of 0.028 Gy / s and a cumulative dose of 10 5 Gy to judge the basic tolerance of the steel structure fireproof coating in the nuclear power plant radiation environment, and then burn the irradiated steel beam to determine the difference in the fire resistance test temperature of the steel structure fireproof coating before and after radiation.

[0097] Select the steel structure fireproof coating for the steel plate and perform an irradiation resistance test with a combination of an irradiation dose rate of 2.8 Gy / s and a cumulative dose of 10 2 Gy to judge the basic tolerance of the steel structure fireproof coating in the nuclear power plant radiation environment, and then burn the irradiated steel plate to determine the difference in the fire resistance test temperature of the steel structure fireproof coating before and after radiation.

[0098] 2. Select steel structure fireproof coatings for different steels (including steel plates, steel beams, and steel columns), and conduct radiation resistance tests with irradiation dose rates of 0.028 Gy / s - 2.8 Gy / s and cumulative doses of 10 2 -10 7 Gy in combination. Burn-test the irradiated steels (including steel plates, steel beams, and steel columns), and then use infrared thermal imaging technology to monitor the change in the surface temperature distribution of the specimens, and judge the change in the surface temperature distribution of the steel structure fireproof coating specimens before and after radiation.

[0099] 3. Select steel structure fireproof coatings for different steels (including steel plates, steel beams, and steel columns), and conduct radiation resistance tests with irradiation dose rates of 0.028 Gy / s - 2.8 Gy / s and cumulative doses of 10 2 -10 7 Gy in combination. Burn-test the irradiated steels (including steel plates, steel beams, and steel columns), calculate the thermal conductivity, and judge the difference in the thermal conductivity of the steel structure fireproof coating before and after radiation.

[0100] 4. Select steel structure fireproof coatings for different steels (including steel plates, steel beams, and steel columns), and conduct radiation resistance tests with irradiation dose rates of 0.028 Gy / s - 2.8 Gy / s and cumulative doses of 10 2 -10 7 Gy in combination. Burn-test the irradiated steels (including steel plates, steel beams, and steel columns), observe the height of the expansion layer appearance and use an electron microscope to observe the structure of the expansion layer, and judge the differences in the appearance and structure of the expansion layer of the steel structure fireproof coating before and after radiation.

[0101] A method for verifying the performance of fireproof coatings in a radiation environment disclosed in this embodiment combines the GB14907-2018 standard, the ASTM D4082-10 (2023) standard, and the NB / T20133.3 (procedure a) standard to construct a comprehensive test system; this integrated system can evaluate the performance of steel structure fireproof coatings in the radiation control area of a nuclear power plant from multiple dimensions, and accurately judge the adaptability and fire resistance of steel structure fireproof coatings. Since a single standard cannot comprehensively consider the complex factors in this special environment, the integration of multiple standards is the core difference between this embodiment and other conventional test methods.

[0102] The irradiation dose rate range mentioned in this embodiment is 0.028 Gy / s - 2.8 Gy / s, and the cumulative dose is 10 2 -10 7 Gy, and the radiation source is not limited to cobalt-60; the steel structure fireproof coatings mentioned are tested with different dose rates and different cumulative doses on different steels, where the steels include steel plates, steel beams, steel columns, etc.

[0103] The fireproof coating for steel structures mentioned in this embodiment is tested on steel with different dose rates and different cumulative doses, and then analyzed after the burning test, including the attenuation amount of heat insulation efficiency, the appearance and structural differences of the expansion layer of the fireproof coating for steel structures, the difference in the thermal conductivity of the fireproof coating for steel structures, and the use of infrared thermal imaging technology to monitor the change in the surface temperature distribution of the test piece, so as to judge the change of the fireproof coating for steel structures before and after radiation.

[0104] In this embodiment, every link of the test piece production, including the selection of 36b hot-rolled I-beams and steel plates of different specifications, strict anti-corrosion treatment, spraying and maintenance in a specific environment, to a series of test processes such as the fire resistance limit test of steel beams, the heat insulation efficiency test, and the radiation resistance test, are all designed closely around the environment of the radiation control area of the nuclear power plant. These steps are interlocked, accurately simulating and detecting the performance of the fireproof coating for steel structures in the actual application environment, which are the key implementation steps of this embodiment and need to be protected with emphasis to prevent others from circumventing this invention by modifying some processes.

[0105] Environmental adaptability and fire resistance performance verification link: Verify the environmental adaptability and fire resistance performance of the fireproof coating for steel structures used in the radiation control area of the nuclear power plant according to multiple specifications, which is the ultimate goal and value embodiment of this embodiment.

[0106] A method for verifying the performance of a fireproof coating for steel structures proposed in this embodiment solves the problem of application in a specific environment. Usually, the fireproof coating for steel structures only conducts the fire resistance limit test of steel beams in accordance with GB14907-2018, without targeting the environment of the radiation control area of the nuclear power plant. And this embodiment proposes a special test method for the current situation that there is no evaluation basis for the adaptability and fire resistance performance of the fireproof coating for steel structures in the radiation control area of the nuclear power plant.

[0107] A method for verifying the performance of a fireproof coating for steel structures proposed in this embodiment provides a comprehensive evaluation basis for the performance of the fireproof coating for steel structures in the nuclear power plant radiation environment. The test content of the existing technology is single and cannot comprehensively evaluate the performance of the fireproof coating for steel structures in the complex environment of the nuclear power plant. This embodiment not only covers the fire resistance limit test of steel beams and the reference heat insulation efficiency test, but also adds steps such as the radiation resistance test of steel structure test pieces, the heat insulation efficiency test, and the calculation of heat insulation efficiency deviation and the verification of environmental adaptability and fire resistance performance. Through comprehensive test processes such as radiation, fire resistance limit, and reference heat insulation efficiency and strict standards, it provides a perfect evaluation basis for judging whether the fireproof coating for steel structures can be used normally in the radiation control area of the nuclear power plant. For example, by calculating whether the attenuation amount of heat insulation efficiency is within the range of ±35% specified in the GB14907-2018 specification, it can accurately judge whether the fire resistance performance of the coating is stable in the radiation environment.

[0108] A method for verifying the performance of a steel structure fireproof coating proposed in this embodiment can reduce maintenance costs and safety risks. Since the prior art cannot ensure the normal performance of the steel structure fireproof coating in the radiation control area of a nuclear power plant, a large amount of manual maintenance and regular updates are required, resulting in high costs and potential safety hazards. In this embodiment, a suitable product is selected through strict test methods for application in actual projects, ensuring that the steel structure fireproof coating can play a normal safety protection role in this environment. This benefits from the detailed specimen production, curing, test procedures and comprehensive application of various specifications in this embodiment, effectively reducing the maintenance costs and safety risks caused by poor performance of the steel structure fireproof coating and ensuring the safe and stable operation of the nuclear power plant.

[0109] 4. Simplify the specification integration plan: Omit ASTM D4082-10(2023) and NB / T20133.3 (procedure a), and only retain GB14907-2018. At the same time, based on GB14907-2018, special test indicators for the radiation environment of nuclear power plants are supplemented, such as adding a detection item for the influence of radiation decomposition products on the steel structure fireproof coating. Through this method, performance evaluation is carried out for special environments to achieve the invention purpose.

[0110] Embodiment 2

[0111] In this embodiment, a system for verifying the performance of a fireproof coating in a radiation environment is disclosed, including:

[0112] A data acquisition unit for acquiring the reference heat insulation efficiency of the steel structure fireproof coating and the heat insulation efficiency of the steel structure specimen;

[0113] A heat insulation efficiency attenuation amount determination unit for obtaining the heat insulation efficiency attenuation amount according to the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency;

[0114] A steel structure fireproof coating performance determination unit for evaluating the fire resistance performance of the steel structure fireproof coating in a radiation environment according to the heat insulation efficiency attenuation amount.

[0115] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A method for verifying the performance of fireproof coatings under a radiation environment, characterized in that, Including: Obtain the reference heat insulation efficiency of the steel structure fireproof coating; Fabricate a steel structure specimen coated with the steel structure fireproof coating; Conduct a radiation resistance test and a heat insulation efficiency test on the steel structure specimen in sequence to obtain the heat insulation efficiency of the steel structure specimen; Obtain the heat insulation efficiency attenuation amount based on the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency; Evaluate the fire resistance performance of the steel structure fireproof coating in a radiation environment according to the heat insulation efficiency attenuation amount; 2. The method for verifying the performance of a fireproof coating in a radiation environment according to claim 1, wherein Calculate the error between the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency, divide the error by the reference heat insulation efficiency, and express it as a percentage to obtain the heat insulation efficiency attenuation amount of the steel structure specimen; 3. The performance verification method of the fireproof coating under a radiation environment according to claim 1, characterized in that The steel structure fireproof coating is a coating that has passed the fire resistance limit test; 4. The method for verifying the performance of a fireproof coating in a radiation environment according to claim 1, wherein The heat insulation efficiency is expressed by the test time when the average temperature on the back fire surface of the specimen reaches the set value; 5. The method for verifying the performance of a fireproof coating under a radiation environment according to claim 1, wherein Spray the fireproof coating on the steel plate after anti-corrosion treatment, and perform curing and drying to obtain a steel structure specimen coated with the steel structure fireproof coating; 6. The performance verification method of a fireproof coating under a radiation environment according to claim 1, characterized in that, Conduct a radiation resistance test on the steel structure specimen; For the steel structure specimen that has passed the radiation resistance test, conduct a heat insulation efficiency test to obtain the heat insulation efficiency of the steel structure specimen; 7. The method for verifying the performance of a fireproof coating under a radiation environment according to claim 1, wherein, Obtain the physical and chemical properties of the steel structure specimen before and after the radiation resistance test; When the physical and chemical properties of the steel structure specimen remain unchanged before and after the radiation resistance test, it is determined that the radiation resistance test of the steel structure specimen is qualified; 8. The method for verifying the performance of a fireproof coating under a radiation environment according to claim 1, wherein When the heat insulation efficiency attenuation amount is greater than the set threshold value, it is determined that the fire resistance performance of the steel structure fireproof coating does not meet the use requirements in the radiation environment; When the heat insulation efficiency attenuation amount is less than or equal to the set threshold value, it is determined that the fire resistance performance of the steel structure fireproof coating meets the use requirements in the radiation environment; 9. The method for verifying the performance of a fireproof coating under a radiation environment according to claim 1, wherein Also obtain the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the radiation resistance test, and the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test; Based on the temperature, thermal conductivity, appearance and structure of the expansion layer of the steel structure specimen before the radiation resistance test, and the temperature, thermal conductivity, appearance and structure of the expansion layer after the heat insulation efficiency test, obtain the differences in the fire resistance test temperature, surface temperature distribution, thermal conductivity, and appearance and structure of the expansion layer of the fireproof coating before and after radiation; Evaluate the adaptability of the fireproof coating in a radiation environment according to the differences in the fire resistance test temperature, surface temperature distribution, thermal conductivity, and appearance and structure of the expansion layer of the fireproof coating before and after radiation; 10. A performance verification system for fireproof coatings in a radiation environment, characterized in that, Including: A data acquisition unit for obtaining the reference heat insulation efficiency of the steel structure fireproof coating and the heat insulation efficiency of the steel structure specimen; A heat insulation efficiency attenuation amount determination unit for obtaining the heat insulation efficiency attenuation amount based on the heat insulation efficiency of the steel structure specimen and the reference heat insulation efficiency; A steel structure fireproof coating performance determination unit for evaluating the fire resistance performance of the steel structure fireproof coating in a radiation environment according to the heat insulation efficiency attenuation amount;

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