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Method for measuring combustion heat release rate in full-scale ventilated confined spaces

A release rate and confined space technology, which is applied in the field of measurement of combustion heat release rate in a full-scale ventilated restricted space, can solve problems such as unreliability and uneven distribution of smoke, and achieve the effect of reducing consumables and simplifying the measurement process

Active Publication Date: 2020-01-31
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the carbon dioxide gas concentration is measured by a single point, but due to the influence of thermal buoyancy and ventilation during combustion, the distribution of the smoke is not uniform, so the single point measurement is not reliable

Method used

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  • Method for measuring combustion heat release rate in full-scale ventilated confined spaces
  • Method for measuring combustion heat release rate in full-scale ventilated confined spaces
  • Method for measuring combustion heat release rate in full-scale ventilated confined spaces

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Experimental program
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Effect test

Embodiment 1

[0061] In this embodiment, a method for measuring the combustion heat release rate in a full-scale ventilated confined space based on the principle of three-layer flue gas partitioning and carbon dioxide generation, the steps are as follows:

[0062] S1: Select indoor flue gas measuring points and arrange flue gas analyzers. Based on the stratification of the flue gas in the three areas, three flue gas analyzer probes are respectively fixed on the upper, middle and lower layers, and the flue gas analyzer probes on the same layer have an appropriate distance;

[0063] S2: Fix the probe of the flue gas analyzer for measuring the concentration of carbon dioxide gas at the exhaust port;

[0064] S3: Debug all flue gas analyzers to synchronize the measurement time and ignite the fire source;

[0065] S4: average the gas concentration data of the indoor flue gas measuring points;

[0066] S5: Calculate the combustion heat release rate based on the principle of carbon dioxide gener...

Embodiment 2

[0085] Present embodiment except following feature other structures are with embodiment 1:

[0086] In this embodiment, the fire source of the combustion test is located in the corner, and the fuel is a heptane oil pool.

[0087] The calculated value of the heat release rate in this embodiment is compared with the experimental value of actual combustion figure 2 shown.

Embodiment 3

[0089] Present embodiment except following feature other structures are with embodiment 1:

[0090] In this embodiment, the fire source of the combustion test is located near the wall, and the fuel is PMMA solid.

[0091] The calculated value of the heat release rate in this embodiment is compared with the experimental value of actual combustion image 3 shown.

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Abstract

The invention relates to a full-size ventilation limited space combustion heat release rate measurement method, comprising the following steps: S1, selecting indoor smoke measurement points, based onthree-zone smoke stratification, arranging three smoke analyzer probes in each of the upper, middle and lower layers in a combustion space, and simultaneously measuring the concentration of carbon monoxide gas and carbon dioxide gas by a smoke analyzer; S2, arranging a smoke analyzer probe at a smoke outlet, and measuring the concentration of carbon dioxide gas by a smoke analyzer; S3, debugging the smoke analyzers in the S1 and S2 to ensure that the four smoke analyzer probes carry out measurement simultaneously; S4, processing data, namely averaging data about the concentration of carbon monoxide gas and carbon dioxide gas measured by the smoke analyzer in the S1; and S5, calculating the heat release rate of the combustion process based on the principle of carbon dioxide generation. Themethod does not need the complex processing, measurement and calculation process after burning smoke collection and can accurately and reliably measure the distribution of indoor smoke, and the calculation result is reliable.

Description

technical field [0001] The invention relates to a method for measuring the combustion heat release rate, more specifically, to a method for measuring the combustion heat release rate in a full-scale ventilated restricted space. Background technique [0002] At present, the experimental determination of fire heat release rate is still one of the key issues in fire science. Common measurement methods and equipment include weight loss method, combustion smoke analysis method and cone calorimeter. The weight loss method is determined based on the mass loss rate of the fuel. The combustion efficiency is an estimated value when calculating, but in fact the combustion efficiency changes and is greatly affected by environmental factors; the cone calorimeter is used to measure the heat release rate on a small scale common method, but there are some differences between the measurement scene and the real fire scene; the combustion smoke analysis method is to collect all the smoke gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/22
CPCG01N25/22
Inventor 张英郭贤马出原唐凯旋
Owner WUHAN UNIV OF TECH
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