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Method for testing heat release rate of combustible light powder

A technology of heat release rate and testing method, which is applied in the field of measurement and evaluation of material heat release rate, can solve the problems of large deviation of test results and lack of combustion performance of combustible light powder, so as to improve scientificity, increase minimum ignition energy, The effect of reducing the likelihood of an explosion

Inactive Publication Date: 2017-10-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the lack of effective means to characterize the combustion performance of combustible light powders, the current quantitative analysis of the explosion hazard of combustible light powders and their combustion behavior in fires has not been reported.
At the same time, due to the low density of combustible light powder, the combustion performance of the combustible light powder is directly measured with a cone calorimeter, and the deviation of the test results is large. At present, there is no report on the heat release rate of the combustible light powder when it burns

Method used

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  • Method for testing heat release rate of combustible light powder
  • Method for testing heat release rate of combustible light powder

Examples

Experimental program
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Embodiment 1

[0025] This embodiment provides a test method for the heat release rate of combustible light powder, the steps are as follows:

[0026] Step 1, select a grain flour sample, sieve out a powder with a fineness of 80-85 mesh, take 200g and place it in an oven, and dry it at 60°C for 1 hour;

[0027] Step 2, according to the density of the test sample, weigh 2.0g of the sample and load it into the bottom surface of 20×20mm 2 The steel columnar molding equipment is pressed into the mold, the compressive strength is 0.2MPa, the pressure increase rate is 0.05MPa / min, and the pressure is maintained for 3 minutes; the pressure is released and the sample is demoulded to form a square sample with a thickness of 5mm.

[0028] Step 3: After preheating, calibrating and setting the radiation intensity of the cone calorimeter according to the regulations, cover the inner groove of the sample holder with aluminum foil, arrange 25 samples neatly, and lay them flat in the inner groove of the sam...

Embodiment 2

[0031] This example provides a test method for the heat release rate of combustible light powders:

[0032] Step 1, the sieving fineness is 100~120 orders, other is the same as embodiment 1;

[0033] Step 2, adding 2% starch, pressing at 0.4MPa to form a square sample with a thickness of 2mm, the others are the same as in Example 1;

[0034] Step 3, with embodiment 1;

[0035] The experimental results of the heat release rate of the tested cereal flour are shown in Table 1.

Embodiment 3

[0037] This example provides a test method for the heat release rate of combustible light powders:

[0038] Step 1, the sieving fineness is more than 140 orders, and others are the same as embodiment 1;

[0039] Step 2, forming a square sample with a thickness of 3.5mm, others are the same as in Example 1;

[0040] Step 3 is the same as in Example 1.

[0041] The experimental results of the heat release rate of the tested cereal flour are shown in Table 1.

[0042] Table 1 shows the experimental results of testing the heat release rate of grain flour in three examples. It can be seen that the smaller the grain size of the grain flour, the longer the ignition time, the more total heat release, the greater the average heat release rate, and the longer the flame burning time. Short, but the peak heat release rate per unit area does not change much, and the greater the weight loss rate, it indicates that the material burns more fully.

[0043] Table 1 Heat release rate of three...

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Abstract

The invention discloses a method for testing the heat release rate of combustible light powder. After preheating, calibration and irradiation intensity setting are performed on a cone calorimeter by rule, the combustible light powder is subjected to sample pretreatment, samples are placed in a steel mold of 20*20 mm<2> and pressed through manual hydraulic forming under the pressure of 0.2-0.4 MPa, 25 samples are arranged tidily after being demolded and placed on a sample rack with the inner wall and the bottom layer covered with aluminum foil, and experiments and data acquisition are conducted according to the operation instruction of the cone calorimeter. The accuracy of determination of the heat release rate of the combustible light powder is improved, the risk of the experiment process is reduced, the pretreatment process is simple, and the method is high in operability.

Description

technical field [0001] The invention belongs to the technical field of measuring and evaluating the heat release rate of materials, and relates to a method for testing the heat release rate of combustible light powder. Background technique [0002] Clothing and food industries often use cotton, tea, grain, fur, dyes, fibers, etc. as materials, which are prone to produce a large amount of combustible or combustible organic dust during processing, especially in a confined space with high temperature and high pressure, which is very easy to Accidents such as explosions. According to industry statistics, the number of explosions of light dust such as grains accounted for as high as 64.7%. [0003] The current research on dust explosion performance mainly focuses on metal dust with high density. The explosion risk can be predicted and analyzed by testing the heat release rate of dust, and the combustion behavior of materials in fire can be evaluated. Cone calorimeter is mainly u...

Claims

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Application Information

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IPC IPC(8): G01N25/22
CPCG01N25/22
Inventor 王亚超赵江平王玉娇崔晓红李华韩煜久陈敬龙
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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