Calibration method for combustion growth rate index and total heat release in single combustion test

Abstract

The present invention discloses a method for calibrating a combustion growth rate index and a total amount of heat release in a monomer combustion test, the method comprising the steps of inputting a combustion growth rate index setting value for calibration, starting a measurement system and a calibration flow control system, the calibration flow control system controlling the input of a propane flow for calibration, igniting a burner and a calibration burner of a monomer combustion test device, measuring and recording the combustion heat release rate, the total amount of heat release and the combustion growth rate index, and comparing the combustion growth rate index and the total amount of heat release to determine whether the system meets the calibration requirements. The present invention can directly calibrate the combustion growth rate index and the total amount of heat release data of the monomer combustion test by comparing the combustion growth rate index setting value and the total amount of heat release calculated value for calibration with the combustion growth rate index and the total amount of heat release measured values, thereby realizing verification of the data calculation process and the conformity of the overall performance of the monomer combustion test device.

Description

Technical Field

[0001] The invention belongs to the technical field of fire protection testing, and in particular relates to a method for calibrating a combustion growth rate index and a total amount of heat release in a monomer combustion test. Background Art

[0002] The single combustion test is widely used in the evaluation of the combustion performance of building materials. It is the most important combustion test method used in the combustion performance classification of flat materials. This method is carried out in accordance with GB / T 20284 "Single combustion test for building materials or products". It is necessary to use a single combustion test device to test the material samples, and finally obtain the data of the sample's combustion growth rate index and total heat release, and perform the final combustion performance classification. Based on the classification, it is determined whether the material meets the use requirements in the project.

[0003] The single combustion test device conducts relevant tests based on the principle of oxygen consumption. The device collects and discharges the smoke generated during the combustion of the material, and calculates the final combustion growth rate index and total heat release by measuring the smoke temperature, oxygen concentration, carbon dioxide concentration and other data in the exhaust pipe.

[0004] Since the device has high precision requirements for the equipment and the calculation process is complex, there is currently no better method to calibrate the final test data output by the equipment. GB / T 20284 "Single Combustion Test for Building Materials or Products" currently only has calibration methods for equipment components and system responses, but no calibration methods for key parameters such as combustion growth rate index and total heat release, making it impossible to determine the deviation of the final test results.

[0005] On the other hand, due to the complexity of the calculation process, it is difficult to have a convenient verification method to determine whether the equipment's data calculation process and overall performance meet the standard requirements. This has resulted in the emergence of various single combustion test devices on the market. The test results have a wide range of deviations, but it is difficult to give a correct evaluation of the applicability of the equipment.

[0006] Therefore, developing a calibration method for the combustion growth rate index and total heat release of a single combustion test to achieve calibration and verification of the data of the single combustion test device is of great significance for improving the technical level of the single combustion test device in the industry. Summary of the invention

[0007] In order to overcome the above technical defects, the present invention provides a method for calibrating the combustion growth rate index and the total amount of heat release in a monomer combustion test.

[0008] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0009] A method for calibrating a combustion growth rate index and a total amount of heat release in a single combustion test, comprising the steps of:

[0010] Entering a combustion growth rate index setting value for calibration into the calibration flow control system;

[0011] Starting a measurement system and a calibration flow control system of a single combustion test device, wherein the calibration flow control system controls the propane cylinder to output propane to the calibration burner according to the combustion growth rate index setting value;

[0012] Ignite the burner of the monomer combustion test device and the calibration burner respectively;

[0013] Measure and record the combustion heat release rate, total heat release and combustion growth rate index during the combustion process of the single combustion test device;

[0014] Based on the comparison results of the combustion growth rate index with the combustion growth rate index set value for calibration, and the comparison results of the total heat release with the calculated total heat release value, it is determined whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements.

[0015] In one embodiment, before the step of inputting the combustion growth rate index setting value for calibration in the calibration flow control system, the following steps are also included:

[0016] Install the back plate on the single combustion experimental device;

[0017] Placing a calibration burner on a test platform of the monomer combustion experimental device;

[0018] Connecting the calibration burner to the gas outlet of the calibration flow control system;

[0019] Connect the gas inlet of the calibration flow control system to the gas outlet of the propane cylinder.

[0020] In one embodiment, when the propane cylinder outputs propane to the calibration burner, the flow rate of propane is calculated by the following formula:

[0021]

[0022] in: is the calibrated propane flow rate at time t (if the calculated value is less than 0, then =0), the unit is mg / s;

[0023] A is the flow calculation coefficient, the unit is ;

[0024] FIGRA is the setting value of the combustion growth rate index, in W / s;

[0025] t is the test duration, calculated from the system startup, in seconds;

[0026] B is the time correction number for the calculation of the burning growth rate index, in seconds.

[0027] In one embodiment, the flow calculation coefficient A is 0.01~0.1 .

[0028] In one embodiment, the time correction number B for calculating the combustion growth rate index is 120~500s.

[0029] In one embodiment, the combustion growth rate index FIGRA is set to a value of 0-1000 W / s.

[0030] In one embodiment, the maximum value of the test duration t is 1500s.

[0031] In one embodiment, the total heat release calculated value is calculated according to the following formula:

[0032]

[0033] in: is the total cumulative heat release at time t, in MJ;

[0034] FIGRA is the setting value of the combustion growth rate index, in W / s;

[0035] T is the test duration, calculated from the system startup, in seconds;

[0036] B is the time correction number for the calculation of the burning growth rate index, in seconds.

[0037] In one embodiment, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements according to the comparison result of the combustion speed growth index and the setting value of the combustion growth rate index for calibration includes:

[0038] Calculate the average value of the combustion growth rate index from 30 to 1200 seconds before the flame of the combustion test is completely extinguished , the average value and the combustion growth rate index setting value For comparison, if the average The combustion growth rate index setting value used for calibration satisfy , then it is judged that the data acquisition and calculation system of the single combustion test device meets the requirements.

[0039] In one embodiment, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements according to the comparison result of the total heat release amount and the calculated value of the total heat release amount includes:

[0040] If the deviation between the actual measured total heat release value and the calculated total heat release value is within the range of 0~20%, the data acquisition and calculation system of the single combustion test device meets the requirements.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] Through the single combustion test combustion growth rate index and total heat release calibration method of the present invention, by adding a calibration burner in the experimental device, the combustion growth rate index setting value for calibration can be set, and the combustion growth rate index is compared with the combustion growth rate index setting value for calibration, and the total heat release is compared with the total heat release calculated value. The result of the single combustion test, the combustion growth rate index and the total heat release data of the single combustion test can be directly calibrated, so as to realize the verification of the data calculation process and the compliance of the overall performance of the single combustion test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0044] Figure 1 A diagram of an application device for a method for calibrating a combustion growth rate index and a total amount of heat release in a single combustion test in one embodiment;

[0045] Figure 2 The figure is a flow chart of a method for calibrating the combustion growth rate index and the total amount of heat release in a monomer combustion test in one embodiment.

[0046] Description of reference numerals:

[0047] 1. Single combustion test device; 2. Back plate; 3. Test platform; 4. Burner of single combustion test device; 5. Calibration burner; 6. Calibration flow control system; 7. Propane cylinder. DETAILED DESCRIPTION

[0048] 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.

[0049] It should be noted that the serial numbers mentioned in this article, such as S1, S2, etc., are only used to distinguish between steps and do not mean that the steps must be strictly executed in the order of the serial numbers.

[0050] Example 1

[0051] The present embodiment provides a method for calibrating the combustion growth rate index and the total amount of heat release in a single combustion test, which can be applied to Figure 1 The single combustion test device for evaluating the combustion performance of building materials shown in the figure, wherein the test platform 3 in the single combustion test device 1 is used to place the material to be tested in the single combustion test, and the propane gas used for combustion is input by connecting to the propane gas cylinder 7 to perform a combustion test on the test material.

[0052] In one embodiment, Figure 2 As shown in the figure, a method for calibrating the combustion growth rate index and the total heat release of a single combustion test is provided. Figure 1 The single-combustion combustion test device 1 is used as an example to illustrate, and includes the following steps:

[0053] S1: Inputting a combustion growth rate index setting value for calibration into the calibration flow control system 6;

[0054] S2: starting the measurement system and calibration flow control system 6 of the single combustion test device 1, wherein the calibration flow control system 6 controls the propane cylinder 7 to output propane to the calibration burner 5 according to the combustion growth rate index setting value;

[0055] S3: starting the measurement system of the single combustion test device 1, and igniting the burner 4 of the single combustion test device and the calibration burner 5 respectively;

[0056] S4: measuring and recording the combustion heat release rate, total heat release and combustion growth rate index during the combustion process of the single combustion test device 1;

[0057] S5: According to the comparison result of the combustion growth rate index with the combustion growth rate index setting value for calibration, and the comparison result of the total heat release with the total heat release calculated value, it is judged whether the data acquisition and calculation system of the single combustion test device 1 meets the calibration requirements.

[0058] Among them, Figure 1 As shown, a flow control system is connected between the monomer combustion test device 1 and the propane cylinder 7. The flow control system includes a computer, a mass flow meter and an intelligent instrument. The signal line of the mass flow meter is connected to the signal end of the intelligent instrument, and the communication end of the intelligent instrument is connected to the calibration flow control system 6 computer. In the monomer combustion test, the combustion growth rate index setting value for calibration can be input into the calibration flow control system 6 computer.

[0059] When conducting a single combustion test, the test system and the calibration flow control system 6 of the single combustion test device 1 are started, and the propane gas input from the propane cylinder 7 to the single combustion test device 1 is controlled by the connected calibration flow control system 6 for airflow input flow control, and the calibration flow control system 6 controls the propane flow according to the set combustion growth rate index setting value.

[0060] After starting the test system of the single combustion test device 1 and the calibration flow control system 6, the burner 4 of the single combustion test device and the calibration burner 5 are ignited to start the single combustion test experiment of the test material.

[0061] During the test, the combustion heat release rate, the total heat release amount and the combustion growth rate index of the material in the single combustion test device 1 during the combustion process are measured, and the measurement data are recorded.

[0062] The combustion growth rate index is compared with the combustion growth rate index set value for calibration, and the total heat release is compared with the total heat release calculated value, and based on the above two comparison results, it is judged whether the data acquisition and calculation system of the single combustion test device 1 meets the calibration requirements.

[0063] Specifically, before the test begins, the following preparation steps are also included:

[0064] Install the back plate 2 on the monomer combustion experimental device;

[0065] Placing the calibration burner 5 on the test platform 3 of the monomer combustion experimental device;

[0066] Connecting the calibration burner 5 to the gas outlet of the calibration flow control system 6;

[0067] The air inlet of the calibration flow control system 6 is connected to the air outlet of the propane gas cylinder 7 .

[0068] Among them, by placing the calibration burner 5 on the test platform 3 of the monomer combustion test device, it can burn simultaneously with the burner 4 of the monomer combustion test device during the experiment. The calibration burner 5 is connected to the propane gas inlet of the monomer combustion test device 1. During the monomer combustion test, the flow control system is cooperated to directly calibrate the combustion growth rate index and the total heat release data of the monomer combustion test.

[0069] In one embodiment, when the propane cylinder 7 outputs propane to the calibration burner 5, the flow rate of propane is calculated by the following formula:

[0070]

[0071] in: is the calibrated propane flow rate at time t (if the calculated value is less than 0, then =0), the unit is mg / s;

[0072] A is the flow calculation coefficient, the unit is ;

[0073] FIGRA is the setting value of the combustion growth rate index, in W / s;

[0074] t is the test duration, calculated from the system startup, in seconds;

[0075] B is the time correction number for the calculation of the burning growth rate index, in seconds.

[0076] The propane flow calculation is completed by the calibration flow control system 6 connected to the propane gas cylinder 7, and the calibration flow control system 6 controls the flow of the ethane gas in real time according to the propane gas flow calculation formula.

[0077] In one embodiment, the flow calculation coefficient A is 0.01~0.1 .

[0078] In one embodiment, the time correction number B for calculating the combustion growth rate index is 120-500s.

[0079] Among them, in the current relevant test methods, the GB / T 20284 standard performs FIGRA calculation from 300s, while the GB / T 20284 standard being revised performs FIGRA calculation from 120s. Setting the time correction coefficient B to 120~500s can ensure that the method of the present invention is consistent with the relevant formula in the GB / T 20284 standard, thereby achieving the purpose of calibration of the invention.

[0080] In one embodiment, the combustion growth rate index FIGRA is set to a value of 0-1000 W / s.

[0081] Among them, FIGRA is the core parameter. In the current national standard GB 8624-2012, FIGRA less than or equal to 20W / s can meet the requirements of combustion performance A1, FIGRA less than or equal to 120W / s can meet the requirements of A2 and B, FIGRA less than or equal to 250W / s can meet the requirements of C, and FIGRA less than or equal to 750W / s can meet the requirements of D. When the FIGRA setting value is designed to be 0~1000W / s, it includes the range of the above-mentioned various judgment values. And according to this method, the accuracy of each key judgment value is calibrated to prove that the relevant equipment or system can meet the requirements.

[0082] In one embodiment, the maximum value of the test duration t is 1500s.

[0083] Specifically, the duration of the test t is controlled within 0-1500s, that is, the burning time of the material in the single combustion test is controlled within 1500s or within 1500s.

[0084] In one embodiment, the total heat release calculated value is calculated according to the following formula:

[0085]

[0086] in: is the total cumulative heat release at time t, in MJ;

[0087] FIGRA is the setting value of the combustion growth rate index, in W / s;

[0088] T is the test duration, calculated from the system startup, in seconds;

[0089] B is the time correction number for the calculation of the burning growth rate index, in seconds.

[0090] In one embodiment, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements according to the comparison result of the combustion speed growth index and the combustion growth rate index setting value for calibration includes:

[0091] Calculate the average value of the combustion growth rate index from 30 to 1200 seconds before the flame of the combustion test is completely extinguished , the average value and the combustion growth rate index setting value For comparison, if the average The burning growth rate index setting value used for calibration satisfy , then it is judged that the data acquisition and calculation system of the single combustion test device meets the requirements.

[0092] Specifically, the data acquisition and calculation system of the single combustion test device is judged whether it meets the requirements based on the comparison result of the combustion speed growth index and the set value of the combustion growth rate index used for calibration. The combustion growth rate index of the combustion test device is calculated from 30 to 1200 seconds before the flame is completely extinguished. The combustion growth index in the selected combustion time is more representative, and the combustion growth rate index in the time is averaged, and the average value of the obtained combustion growth rate index is The burning growth rate index setting value used for calibration For comparison, if satisfied , then the data acquisition and calculation system of the single combustion test device meets the requirements; if not, then the data acquisition and calculation system of the single combustion test device does not meet the requirements.

[0093] In one embodiment, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements according to the comparison result of the total heat release amount and the calculated value of the total heat release amount includes:

[0094] If the deviation between the actual measured total heat release value and the calculated total heat release value is within the range of 0~20%, the data acquisition and calculation system of the single combustion test device meets the requirements.

[0095] Specifically, the calculated value of the total amount of heat release is obtained by calculating the data measurement records, and the calculated value of the total amount of heat release is compared with the total amount of heat release to determine whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements. If the deviation between the actual measured total amount of heat release value and the calculated value of the total amount of heat release is within the range of 0~20%, then the data acquisition and calculation system of the single combustion test device meets the requirements; if not, then the data acquisition and calculation system of the single combustion test device does not meet the requirements.

[0096] Example 2

[0097] In the embodiment, the average value of the combustion growth rate index 300s before the flame is completely extinguished is preferably selected for comparative analysis. If the deviation between the average value and the set value of the combustion growth rate index for calibration is within 10%, the data acquisition and calculation system of the single combustion test device meets the requirements. If the deviation between the actual measured total heat release value and the calculated total heat release value is within 10%, the data acquisition and calculation system of the single combustion test device meets the requirements.

[0098] Among them, the flow calculation coefficient A is 0.021 The time correction number for the calculation of the burning growth rate index is 300s, the setting value of the burning growth rate index FIGRA is 120W / s, and the maximum value of the test duration t is 1000s.

[0099] Example 3

[0100] In this embodiment, the average value of the combustion growth rate index 500s before the flame is completely extinguished is preferably selected for comparative analysis. If the deviation between the average value and the set value of the combustion growth rate index for calibration is within 20%, the data acquisition and calculation system of the single combustion test device meets the requirements. If the deviation between the actual measured total heat release value and the calculated total heat release value is within 20%, the data acquisition and calculation system of the single combustion test device meets the requirements.

[0101] Among them, the flow calculation coefficient A is 0.1 The time correction number for the calculation of the burning growth rate index is 500s, the setting value of the burning growth rate index FIGRA is 1000W / s, and the maximum value of the test duration t is 1500s.

[0102] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. Single combustion test combustion growth rate index and total heat release calibration method, It is characterized in that Includes steps: Entering a combustion growth rate index setting value for calibration into the calibration flow control system; The measurement system and calibration flow control system of the single combustion test device are started. The calibration flow control system controls the propane cylinder to output propane to the calibration burner according to the combustion growth rate index setting value. The flow rate of propane is calculated by the following formula: in: is the calibrated propane flow rate at time t, in mg / s. When the calculated value is less than 0, =0; A is the flow calculation coefficient, the unit is , the flow calculation coefficient A is 0.01~0.1 ; FIGRA is the combustion growth rate index setting value, the unit is W / s, and the combustion growth rate index setting value FIGRA is 0~1000W / s; t is the test duration, which is calculated from the system startup and is in seconds. The maximum value of the test duration t is 1500 seconds. B is the time correction number for the calculation of the combustion growth rate index, in seconds, and the time correction number B for the calculation of the combustion growth rate index is 120 to 500 seconds; Ignite the burner of the monomer combustion test device and the calibration burner respectively; Measure and record the combustion heat release rate, total heat release and combustion growth rate index during the combustion process of the single combustion test device; Based on the comparison results of the combustion growth rate index measurement value and the combustion growth rate index setting value for calibration, and the comparison results of the total heat release measurement value and the total heat release calculation value, it is judged whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements.

2. The method for calibrating the combustion growth rate index and the total amount of heat release in a single combustion test according to claim 1, It is characterized in that Before the step of inputting the combustion growth rate index setting value for calibration in the calibration flow control system, the following steps are also included: Install the back plate on the single combustion experimental device; Placing a calibration burner on a test platform of the monomer combustion experimental device; Connecting the calibration burner to the gas outlet of the calibration flow control system; Connect the gas inlet of the calibration flow control system to the gas outlet of the propane cylinder.

3. The method for calibrating the combustion growth rate index and the total amount of heat release in a single combustion test according to claim 1, It is characterized in that The total heat release calculated value is calculated according to the following formula: in: is the total cumulative heat release at time t, in MJ; FIGRA is the setting value of the combustion growth rate index, in W / s; t is the test duration, calculated from the system startup, in seconds; B is the time correction number for the calculation of the burning growth rate index, in seconds.

4. The method for calibrating the combustion growth rate index and the total amount of heat release in a monomer combustion test according to any one of claims 1 to 3, It is characterized in that According to the comparison result of the combustion growth rate index measurement value and the combustion growth rate index setting value for calibration, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements, including: Calculate the average value of the combustion growth rate index from 30 to 1200 seconds before the flame of the combustion test is completely extinguished , the average value and the combustion growth rate index setting value For comparison, if the average The burning growth rate index setting value used for calibration satisfy , then it is judged that the data acquisition and calculation system of the single combustion test device meets the requirements.

5. The method for calibrating the combustion growth rate index and total heat release of a single combustion test according to any one of claims 1 to 3, It is characterized in that According to the comparison result of the total heat release measurement value and the total heat release calculation value, judging whether the data acquisition and calculation system of the single combustion test device meets the calibration requirements includes: If the deviation between the measured value of the total heat release and the calculated value of the total heat release is within the range of 0~20%, the data acquisition and calculation system of the single combustion test device meets the requirements.

Images