A preheating control method for a non-combustible furnace for building materials

Abstract

The present invention discloses a preheating control method for a non-combustible furnace for building materials, comprising: obtaining the temperature inside a non-combustible test furnace and judging the heating state of the non-combustible test furnace; adjusting the opening of the non-combustible test furnace for heating according to the heating state of the non-combustible test furnace; when the temperature inside the non-combustible test furnace reaches a first target temperature, updating the opening P of the non-combustible test furnace. i =P1×1.1, and the updated opening P i Continue heating for 120 seconds; adjust the opening of the non-combustibility test furnace based on the real-time furnace temperature and the historical temperature difference; when the furnace temperature of the non-combustibility test furnace reaches the first preset temperature range, adjust the opening of the non-combustibility test furnace for the second time based on the real-time furnace temperature and the historical temperature difference; when the furnace temperature of the non-combustibility test furnace reaches the second preset temperature range, stop adjusting the opening of the non-combustibility test furnace, and make a balance judgment on the furnace temperature. The present invention can solve the problem of too long preheating time in the current non-combustibility test of building materials.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion performance detection of building materials, and in particular relates to a preheating control method of a non-combustible furnace of building materials. Background Art

[0002] The combustion performance of building materials is an important basis for classifying the flammability level of building materials, and is also the basis for building fire performance evaluation and building fire protection design guidance. In order to ensure the safety of buildings, many key building and decoration materials in buildings are required to use non-combustible materials. At present, there are clear specifications and standards for the non-combustibility test methods of building materials at home and abroad (GB / T5464, ISO13943, IEC60584-1, EN13238). The existing domestic non-combustibility test method for building materials (GB / T5464-2010) has strict regulations on the non-combustibility test process of building materials: before the sample is placed in the non-combustibility test furnace, the furnace body needs to be preheated so that the furnace temperature is balanced at 750±5℃ for at least 10 minutes, and the temperature drift does not exceed 2℃ within these 10 minutes. However, it takes a long time for the existing non-combustibility test furnace to preheat from room temperature to equilibrium, which makes the time of the non-combustibility test of building materials very long, which seriously restricts the efficiency of non-combustibility detection of building materials. At the same time, since the preheating time of the building material non-combustibility test furnace is relatively long, a lot of electricity and human resources are wasted during the test process, which is not conducive to achieving energy conservation and emission reduction. Summary of the invention

[0003] In order to overcome the above-mentioned technical defects, the present invention provides a preheating control method for a building material non-combustibility furnace. Compared with the existing preheating method of the building material non-combustibility test, the present invention quickly reaches a preheating equilibrium state in the non-combustibility test furnace during the building material non-combustibility test through intelligent control calculation, and compared with the traditional furnace balance control method, the preheating time can be greatly reduced, thereby reducing the test time and greatly improving the efficiency of building material non-combustibility detection, reducing the detection cost.

[0004] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0005] A preheating control method for a non-combustible furnace for building materials comprises the following steps:

[0006] Obtaining the temperature inside the non-combustibility test furnace and determining the heating state of the non-combustibility test furnace;

[0007] According to the heating state of the non-combustibility test furnace, the opening of the non-combustibility test furnace is adjusted to heat it;

[0008] When the temperature inside the non-combustibility test furnace reaches the first target temperature, the opening of the non-combustibility test furnace is updated. =P1×1.1, and the updated opening Continue heating for 120 seconds, where P1 is the initial opening;

[0009] Adjust the opening of the non-combustibility test furnace based on the real-time furnace temperature and historical temperature difference;

[0010] When the temperature inside the non-combustibility test furnace reaches a first preset temperature range, based on the real-time temperature inside the furnace and the historical temperature difference, the opening of the non-combustibility test furnace is adjusted for the second time;

[0011] When the temperature inside the non-combustibility test furnace reaches the second preset temperature range, the adjustment of the opening of the non-combustibility test furnace is stopped, and the temperature inside the furnace is balanced.

[0012] Furthermore, the method further comprises the steps of:

[0013] Establish the corresponding relationship between the power of the non-combustibility test furnace and the opening degree of the non-combustibility test furnace:

[0014]

[0015] in, is the opening of the non-combustibility test furnace, is the power of the non-combustibility test furnace, It is the maximum power of the non-combustibility test furnace.

[0016] Furthermore, the obtaining of the temperature inside the non-combustibility test furnace and the determination of the heating state of the non-combustibility test furnace include:

[0017] If the temperature inside the non-combustibility test furnace T0 ≤ 740°C, the non-combustibility test furnace is heated at room temperature;

[0018] If the temperature in the non-combustibility test furnace T0>740°C, the non-combustibility test furnace is subjected to secondary heating.

[0019] Further, the step of adjusting the opening of the non-combustibility test furnace for preheating according to the heating state of the non-combustibility test furnace comprises:

[0020] If the non-combustibility test furnace is heated at room temperature, adjust the opening of the non-combustibility test furnace to 100% for heating.

[0021] Further, the step of adjusting the opening of the non-combustibility test furnace for preheating according to the heating state of the non-combustibility test furnace comprises:

[0022] If the non-combustibility test furnace is for secondary heating, update the opening of the non-combustibility test furnace =P1×1.1, and the updated opening Heat up.

[0023] Further, adjusting the opening of the non-combustibility test furnace based on the real-time furnace temperature and the historical temperature difference includes:

[0024] Based on real-time furnace temperature Temperature difference with history , Update the opening of the non-flammability test furnace :

[0025]

[0026] Among them, the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago The difference between

[0027] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula .

[0028] Furthermore, when the temperature inside the non-combustibility test furnace reaches a first preset temperature range, based on the real-time temperature inside the furnace and the historical temperature difference, the opening of the non-combustibility test furnace is adjusted for the second time, including:

[0029] When the temperature inside the non-combustibility test furnace is within the range of 750±5℃, based on the real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace :

[0030] ;

[0031] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula .

[0032] Furthermore, when the temperature inside the non-combustibility test furnace reaches a second preset temperature range, the opening of the non-combustibility test furnace is stopped from being adjusted, and a balance judgment is made on the temperature inside the furnace, including:

[0033] When the temperature in the non-combustibility test furnace is maintained within the range of 750±2°C within the first preset time, the opening of the non-combustibility test furnace is stopped;

[0034] When the temperature in the non-combustibility test furnace is kept within the range of 750±5°C within the second preset time, and the temperature drift does not exceed 2°C, the temperature in the furnace reaches equilibrium;

[0035] Record the opening of the non-combustibility test furnace at this time.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention discloses a preheating control method for a building material non-combustibility furnace to solve the problem that the preheating stage time of the current building material non-combustibility test is too long, comprising the steps of: obtaining the furnace temperature of the non-combustibility test furnace and judging the heating state of the non-combustibility test furnace; adjusting the opening of the non-combustibility test furnace for heating according to the heating state of the non-combustibility test furnace; when the furnace temperature of the non-combustibility test furnace reaches a first target temperature, updating the opening of the non-combustibility test furnace =P1×1.1, and the updated opening Continue heating for 120s, where P1 is the initial opening; adjust the opening of the non-combustibility test furnace based on the real-time furnace temperature and the historical temperature difference; when the furnace temperature of the non-combustibility test furnace reaches the first preset temperature range, adjust the opening of the non-combustibility test furnace for the second time based on the real-time furnace temperature and the historical temperature difference; when the furnace temperature of the non-combustibility test furnace reaches the second preset temperature range, stop adjusting the opening of the non-combustibility test furnace, and make a balance judgment on the furnace temperature. Compared with the existing preheating method of the non-combustibility test of building materials, the present invention quickly reaches the preheating equilibrium state in the non-combustibility test furnace in the non-combustibility test of building materials through intelligent control calculation, and compared with the traditional furnace balance control method, the preheating time can be greatly reduced, thereby reducing the test time and greatly improving the efficiency of non-combustibility detection of building materials, reducing the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 The process of the preheating control method of the non-combustible furnace for building materials described in Example 1 and Example 2 Figure 1 ;

[0040] Figure 2 The process of the preheating control method of the non-combustible furnace for building materials described in Example 1 and Example 2 Figure 2 ;

[0041] Figure 3 The temperature rise time curve from room temperature to the equilibrium state in the preheating stage when the non-combustibility test of building materials is carried out by the present method as described in Example 1;

[0042] Figure 4 This is a temperature rise time curve from room temperature to the equilibrium state in the preheating stage when the building material non-combustibility test is carried out using the traditional control method described in Example 1. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] Example 1

[0045] This embodiment discloses a preheating control method for a building material non-combustibility furnace, so that the non-combustibility test furnace can quickly stabilize at 750°C and quickly reach a preheating equilibrium state during the preheating stage of the building material non-combustibility test, thereby reducing test time, saving energy, and improving test efficiency.

[0046] In one embodiment, if Figure 1 and 2 A preheating control method for a non-combustible building material furnace comprises the following steps:

[0047] S1. Obtaining the temperature inside the non-combustibility test furnace and determining the heating state of the non-combustibility test furnace.

[0048] When the non-combustibility test furnace is preheated from room temperature, the heat absorption of the furnace body itself needs to be considered; when the non-combustibility test furnace is tested for the second time after completing the previous test, the furnace body has been fully heated in the previous test and the heat absorption of the furnace body itself does not need to be considered. Therefore, it is necessary to judge the heating state of the non-combustibility test furnace at the time t0 when the non-combustibility test furnace starts preheating, that is, whether the non-combustibility test furnace is preheated from room temperature (i.e., room temperature heating) or from a high temperature state during the second test (i.e., secondary heating).

[0049] Specifically, step S1 includes:

[0050] If the temperature inside the non-combustibility test furnace T0 ≤ 740°C, the non-combustibility test furnace is heated at room temperature;

[0051] If the temperature in the non-combustibility test furnace T0>740°C, the non-combustibility test furnace is subjected to secondary heating.

[0052] In this embodiment, the non-combustibility test furnace is heated at room temperature (T0≤740℃) for description:

[0053] S2. According to the heating state of the non-combustibility test furnace, the opening of the non-combustibility test furnace is adjusted to perform heating.

[0054] Specifically, if the non-combustibility test furnace is heated at room temperature, adjust the opening of the non-combustibility test furnace to 100% and heat until the furnace temperature reaches i The target temperature is set to 770°C, which is 20°C higher than the equilibrium temperature of 750°C to compensate for the heat absorption of the furnace.

[0055] S3. When the temperature inside the non-combustibility test furnace When reaching 770℃ for the first time, update the opening of the non-combustibility test furnace =P1×1.1, and the updated opening Continue heating for 120 seconds, wherein P1 is the initial opening, and in this embodiment, the initial opening P1 is 50%. This is the temperature control stage of preheating.

[0056] Considering the opening After continuous iterations, the calculation may exceed the actual range. P i <10 o'clock, P i =10; P i >100, P i =100.

[0057] S4, based on real-time furnace temperature Temperature difference with history , Update the opening of the non-flammability test furnace :

[0058]

[0059] Among them, the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago This is because after the opening of the non-flammability test furnace is adjusted, it takes about 120s to be reflected by temperature changes.

[0060] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula , so that the temperature inside the non-combustibility test furnace is within the range of 750±5℃.

[0061] S5. After the opening of the non-combustibility test furnace is updated and the temperature is controlled through steps S3 and S4, when the temperature inside the non-combustibility test furnace is T ii 745℃≤T ii ≤748℃ or 752℃≤T ii ≤755℃, based on real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace :

[0062] ;

[0063] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula , so that the temperature inside the non-combustibility test furnace is within the range of 750±2℃. is the real-time furnace temperature at time i, is the real-time furnace temperature at time ii, , , as well as Same reason.

[0064] S6. When the temperature inside the non-combustibility test furnace reaches a second preset temperature range, the adjustment of the opening of the non-combustibility test furnace is stopped, and a balance judgment is made on the temperature inside the furnace.

[0065] Specifically, step S6 includes:

[0066] When the temperature inside the non-combustibility test furnace remains within the range of 750±2℃ within 6 minutes, stop adjusting the opening of the non-combustibility test furnace.

[0067] When the temperature in the non-combustibility test furnace is always stable within the range of 750±5℃ within 10 minutes, and the temperature drift does not exceed 2℃ within the 10 minutes, it is considered that the temperature in the furnace has reached equilibrium and the opening of the non-combustibility test furnace has converged;

[0068] The opening of the non-combustibility test furnace at this time is recorded, and the opening can be directly called for rapid preheating during the next non-combustibility test.

[0069] In one embodiment, the step S1 further includes the following steps:

[0070] Establish the corresponding relationship between the power of the non-combustibility test furnace and the opening degree of the non-combustibility test furnace:

[0071]

[0072] in, is the opening of the non-combustibility test furnace, is the power of the non-combustibility test furnace, It is the maximum power of the non-combustibility test furnace.

[0073] The following is further described in conjunction with specific implementation methods:

[0074] Start the building material non-combustibility test device and directly call the saved initial opening P1 of the previous test before the test begins. If this test furnace is tested for the first time, assume that the initial opening P1 = 50%.

[0075] The non-flammability test furnace starts heating from room temperature at 100% opening, and the furnace temperature is recorded every 1 second. , and judge the furnace temperature in real time Whether it reaches 770℃. ≥770℃, =P1×1.1, based on the opening Continue heating for 120 seconds.

[0076] Based on real-time furnace temperature Temperature difference with history , update the opening that should be set for the current non-combustibility test furnace , where the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace After several updates, the temperature inside the non-flammability test furnace Within the range of 750±5℃.

[0077] Based on real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace , where the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace After several updates, the temperature inside the non-flammability test furnace In the range of 750±2℃, when the temperature inside the non-flammability test furnace is When the temperature is kept within 750±2℃ for 6 minutes, stop adjusting the opening and start judging the temperature equilibrium state of the furnace.

[0078] The furnace temperature equilibrium state judgment condition is: the temperature in the non-combustibility test furnace is continuously stable at 750±5℃ for at least 10 minutes, and the temperature drift does not exceed 2℃ within this 10 minutes. When the furnace temperature reaches the equilibrium condition, the opening of the non-combustibility test furnace Converge and save it as P1 for direct call during the next test.

[0079] The temperature rise curve from room temperature to the equilibrium state in the preheating stage is as follows: Figure 3 As shown in Figure 2, the initial equilibrium state is reached in 44 minutes, which is significantly lower than that of the traditional control method. Figure 4 , saving 36 minutes of warm-up time (saving 45%).

[0080] After the furnace temperature reaches the equilibrium condition, the preheating of the non-combustibility test furnace is completed, and the building material samples can be placed in the non-combustibility test furnace to continue the subsequent test steps.

[0081] Example 2

[0082] This embodiment discloses a preheating control method for a non-combustible furnace for building materials, such as Figure 1 and 2Specifically, in this embodiment, the non-combustibility test furnace is used for secondary heating (T0>740℃) to illustrate:

[0083] S1. Obtain the temperature inside the non-combustibility test furnace and determine the heating state of the non-combustibility test furnace. The specific implementation content of step S1 is the same as that of embodiment 1 and will not be described in detail here.

[0084] S2. When the temperature in the non-combustibility test furnace T0>740℃, update the opening of the non-combustibility test furnace =P1×1.1, and the updated opening Continue heating for 120 seconds, where P1 is the initial opening, and in this embodiment, the initial opening P1 is 50%. This is the temperature control stage of preheating. After continuous iterations, the calculation may exceed the actual range. P i <10 o'clock, P i =10; P i >100, P i =100.

[0085] S3, based on real-time furnace temperature Temperature difference with history , Update the opening of the non-flammability test furnace :

[0086]

[0087] Among them, the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago The difference.

[0088] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula , so that the temperature inside the non-combustibility test furnace is within the range of 750±5℃.

[0089] S4. After the opening of the non-combustibility test furnace is updated and the temperature is controlled through steps S2 and S3, when the temperature inside the non-combustibility test furnace is T ii 745℃≤T ii ≤748℃ or 752℃≤T ii ≤755℃, based on real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace :

[0090] ;

[0091] Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula , so that the temperature inside the non-combustibility test furnace is within the range of 750±2℃.

[0092] S6. When the temperature inside the non-combustibility test furnace reaches a second preset temperature range, the adjustment of the opening of the non-combustibility test furnace is stopped, and a balance judgment is made on the temperature inside the furnace.

[0093] Specifically, step S6 includes:

[0094] When the temperature inside the non-combustibility test furnace remains within the range of 750±2℃ within 6 minutes, stop adjusting the opening of the non-combustibility test furnace.

[0095] When the temperature in the non-combustibility test furnace is always stable within the range of 750±5℃ within 10 minutes, and the temperature drift does not exceed 2℃ within the 10 minutes, it is considered that the temperature in the furnace has reached equilibrium and the opening of the non-combustibility test furnace has converged;

[0096] The opening of the non-combustibility test furnace at this time is recorded, and the opening can be directly called for rapid preheating during the next non-combustibility test.

[0097] In one embodiment, the step S1 further includes the following steps:

[0098] Establish the corresponding relationship between the power of the non-combustibility test furnace and the opening degree of the non-combustibility test furnace:

[0099]

[0100] in, is the opening of the non-combustibility test furnace, is the power of the non-combustibility test furnace, It is the maximum power of the non-combustibility test furnace.

[0101] The following is further described in conjunction with specific implementation methods:

[0102] The non-combustibility test furnace has been started and has undergone a heating process. >740℃, =P1×1.1, based on the opening Continue heating for 120 seconds.

[0103] Based on real-time furnace temperature Temperature difference with history , update the opening that should be set for the current non-combustibility test furnace , where the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace After several updates, the temperature inside the non-flammability test furnace Within the range of 750±5℃.

[0104] Based on real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace , where the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace After several updates, the temperature inside the non-flammability test furnace In the range of 750±2℃, when the temperature inside the non-flammability test furnace is When the temperature is kept within 750±2℃ for 6 minutes, stop adjusting the opening and start judging the temperature equilibrium state of the furnace.

[0105] The furnace temperature equilibrium state judgment condition is: the temperature in the non-combustibility test furnace is continuously stable at 750±5℃ for at least 10 minutes, and the temperature drift does not exceed 2℃ within this 10 minutes. When the furnace temperature reaches the equilibrium condition, the opening of the non-combustibility test furnace Converge and save it as P1 for direct call during the next test.

[0106] After the furnace temperature reaches the equilibrium condition, the preheating of the non-combustibility test furnace is completed, and the building material samples can be placed in the non-combustibility test furnace to continue the subsequent test steps.

[0107] During the preheating stage of the non-combustibility test of building materials, the preheating control method of the non-combustibility furnace of building materials provided by the present invention can enable the non-combustibility test furnace to quickly reach a equilibrium state, reduce the test time, and improve the detection efficiency; in addition, automatic balance control of the furnace temperature is achieved through an intelligent control method, without the need for manual debugging, and the furnace temperature control is more accurate, while also reducing labor costs.

[0108] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A preheating control method for a non-combustible furnace for building materials, characterized in that: Includes steps: Obtaining the temperature inside the non-combustibility test furnace and determining the heating state of the non-combustibility test furnace; According to the heating state of the non-combustibility test furnace, the opening of the non-combustibility test furnace is adjusted to heat it; When the temperature inside the non-combustibility test furnace reaches the first target temperature, the opening of the non-combustibility test furnace is updated. =P1×1.1, and the updated opening Continue heating for 120 seconds, where P1 is the initial opening; Adjust the opening of the non-combustibility test furnace based on the real-time furnace temperature and historical temperature difference; When the temperature inside the non-combustibility test furnace reaches a first preset temperature range, the opening of the non-combustibility test furnace is adjusted for the second time based on the real-time temperature inside the furnace and the historical temperature difference, wherein the first preset temperature range is 750±5°C; When the temperature inside the non-combustibility test furnace reaches a second preset temperature range, the opening of the non-combustibility test furnace is stopped from being adjusted, and a balance judgment is made on the temperature inside the furnace, wherein the second preset temperature range is 750±2°C.

2. The preheating control method according to claim 1, characterized in that: Also includes the steps: Establish the corresponding relationship between the power of the non-combustibility test furnace and the opening degree of the non-combustibility test furnace: in, is the opening of the non-combustibility test furnace, is the power of the non-combustibility test furnace, It is the maximum power of the non-combustibility test furnace.

3. The preheating control method according to claim 1, characterized in that: The step of obtaining the temperature inside the non-combustibility test furnace and determining the heating state of the non-combustibility test furnace includes: If the temperature inside the non-combustibility test furnace T0 ≤ 740°C, the non-combustibility test furnace is heated at room temperature; If the temperature in the non-combustibility test furnace T0>740°C, the non-combustibility test furnace is subjected to secondary heating.

4. The preheating control method according to claim 3, characterized in that: The method of adjusting the opening of the non-combustibility test furnace for preheating according to the heating state of the non-combustibility test furnace comprises: If the non-combustibility test furnace is heated at room temperature, adjust the opening of the non-combustibility test furnace to 100% for heating.

5. The preheating control method according to claim 3, characterized in that: The method of adjusting the opening of the non-combustibility test furnace for preheating according to the heating state of the non-combustibility test furnace comprises: If the non-combustibility test furnace is for secondary heating, update the opening of the non-combustibility test furnace =P1×1.1, and the updated opening Heat up.

6. The preheating control method according to claim 1, characterized in that: The method of adjusting the opening of the non-combustibility test furnace based on the real-time furnace temperature and the historical temperature difference includes: Based on real-time furnace temperature Temperature difference with history , Update the opening of the non-flammability test furnace : Among them, the historical temperature difference Real-time furnace temperature The furnace temperature 120s ago The difference between Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula .

7. The preheating control method according to claim 6, characterized in that: When the temperature inside the non-combustibility test furnace reaches a first preset temperature range, based on the real-time temperature inside the furnace and the historical temperature difference, the opening of the non-combustibility test furnace is adjusted for the second time, including: When the temperature inside the non-combustibility test furnace is within the range of 750±5℃, based on the real-time furnace temperature Temperature difference with history , second update of the opening of the non-flammability test furnace : ； Get the real-time furnace temperature every 120 seconds and update the opening of the non-combustibility test furnace according to the above formula .

8. The preheating control method according to claim 7, characterized in that: When the temperature in the non-combustibility test furnace reaches the second preset temperature range, the opening of the non-combustibility test furnace is stopped from being adjusted, and a balance judgment is made on the temperature in the furnace, including: When the temperature in the non-combustibility test furnace is maintained within the range of 750±2°C within the first preset time, the opening of the non-combustibility test furnace is stopped to be adjusted, wherein the first preset time is 6 minutes; When the temperature in the non-combustibility test furnace is kept within the range of 750±5°C and the temperature drift does not exceed 2°C within the second preset time, the temperature in the furnace reaches equilibrium, wherein the second preset time is 10 minutes; Record the opening of the non-combustibility test furnace at this time.

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