A test method for heat release rate of organic dust

A technology of heat release rate and organic dust, which is applied in the field of material heat release rate measurement and evaluation, can solve the problems of quantitative analysis of organic dust explosion hazardous combustion behavior, which has not been reported yet, the combustion performance is difficult to achieve, and the lack of characterization of organic dust, etc. To achieve the effect of improving the minimum ignition energy, the product is dense and uniform, and the impact is small

Inactive Publication Date: 2019-09-13
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0004] However, due to the lack of effective means to characterize the combustion performance of organic dust, the current quantitative analysis of the explosion hazard of organic dust and its combustion behavior in fires has not been reported.
At the same time, because the density of organic dust is too small, it is extremely difficult to measure its combustion performance with a cone calorimeter. At present, there is no report on the heat release rate of light organic dust during combustion.

Method used

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  • A test method for heat release rate of organic dust
  • A test method for heat release rate of organic dust

Examples

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Embodiment 1

[0027] This embodiment provides a test method for the heat release rate of organic dust, the specific steps are as follows:

[0028] Step 1: select a rice husk 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;

[0029] Step 2, according to the density of the test sample, weigh an appropriate amount of sample and put it into pre-laid aluminum foil paper, the bottom surface is 20×20mm 2 After being pressed at 0.4MPa in a steel columnar mold, the pressure is released and demolded to obtain 2-5mm thick briquettes, and 25 samples are made;

[0030] Step 3: Encapsulate the briquette in an elastic plastic bag, seal it and put it into a high-pressure cylinder. The initial pressure is 2MPa, the pressure increase rate is 2MPa / min, and the pressure holding time is 60s; the medium pressure is 50MPa, and the pressure increase rate is 10MPa / min. The pressure holding time is 90s; the high pressure is 100MPa, the press...

Embodiment 2

[0034] This embodiment provides a test method for the heat release rate of organic dust, the specific method is as follows;

[0035] Step 1, sieving out fineness is 100~110 orders, other is the same as embodiment 1;

[0036] Step 2, add 2% starch, press at 0.2MPa, and others are the same as in Example 1;

[0037] Step three and four, with embodiment 1;

[0038] The experimental results of the heat release rate of the tested rice husks are shown in Table 1.

Embodiment 3

[0040] This embodiment provides a test method for the heat release rate of organic dust, the specific method is as follows;

[0041] Step 1, the sieving fineness is more than 120 orders, and others are the same as in Example 1;

[0042] Steps two to four are the same as in Example 1. The experimental results of the heat release rate of the tested rice husks are shown in Table 1.

[0043] The heat release rate of different fineness sample embodiment of table 1

[0044]

[0045] It can be seen from Table 1 that the heat release rate of organic powders with different finenesses can be successfully measured by this method, and the heat release performance of the samples treated by isostatic pressing is stable, which is shown as the change of ignition time and flaming combustion time , but the total heat release, peak heat release rate per unit area, and average heat release rate of samples with different finenesses are relatively close.

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Abstract

The invention discloses a method for testing the heat release rate of organic dust, comprising the following steps: Step 1, take the powder to be tested, and sieve it after drying; After pressing in the columnar mold, release the pressure and demould to obtain a briquette; step 3, wrap the briquette in an elastic bag, put it into a liquid high-pressure cylinder, and perform initial pressure-medium pressure-high pressure wet molding; step 4, The heat release performance of the product of step 3 is measured by using a cone calorimeter. The invention proposes a method for measuring the heat release rate of organic dust for the first time. It solves the problems of extremely low density of organic dust, easy generation of static electricity on the surface, and uneven pressure, and can accurately measure its heat release rate with a cone calorimeter.

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 organic dust. 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 organic 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. Cone calorimeter is mainly used to measure its combustion performance parameters, and its explosion risk is predicted and analyzed by testing the heat release rate of dust. Hu Yunchu design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/26
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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