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Measurement method of heat release rate in a ventilated confined space based on three-zone oxygen consumption method

A technology of heat release rate and limited space, applied in the direction of thermal development of materials, can solve the problems of uneven distribution and unreliability of flue gas, and achieve the effect of reducing consumables and simplifying the measurement process.

Active Publication Date: 2020-04-21
WUHAN UNIV OF TECH
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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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  • Measurement method of heat release rate in a ventilated confined space based on three-zone oxygen consumption method
  • Measurement method of heat release rate in a ventilated confined space based on three-zone oxygen consumption method
  • Measurement method of heat release rate in a ventilated confined space based on three-zone oxygen consumption method

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Embodiment 2

[0066] Other structures of this embodiment are the same as those of Embodiment 1 except the following features:

[0067] In this embodiment, the fire source of the combustion test is located at the bottom of the wall, and the fuel is methanol oil pool.

[0068] The comparison between the calculated value of the heat release rate in this embodiment and the experimental value of actual combustion figure 2 shown.

Embodiment 3

[0070] Other structures of this embodiment are the same as those of Embodiment 1 except the following features:

[0071] In this embodiment, the fire source of the combustion test is located beside the wall, and the fuel is PMMA solid.

[0072] The comparison between the calculated value of the heat release rate in this embodiment and the experimental value of actual combustion image 3 shown.

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Abstract

The invention relates to a three-region oxygen consumption method-based ventilation restricted space heat release rate measurement method, which comprises the following steps: S1, selecting an indoorflue gas measurement point, and arranging three flue gas analyzer probes in each of upper, middle and lower layer regions of a combustion space based on three layers of flue gas subregions, wherein the flue gas analyzer measures the concentrations of carbon monoxide and oxygen; S2, arranging a flue gas analyzer probe at each of an air inlet and a flue gas discharging port, wherein a flue gas analyzer measures the concentration of oxygen; S3, debugging the flue gas analyzers in Step I and Step II to guarantee simultaneous measurement; S4, processing data, and averaging the data measured by theflue gas analyzer in Step I; and S5, calculating a heat release rate of the combustion process based on an oxygen consumption principle. The method can directly measure and calculate the heat releaserate in the combustion process during a combustion test experiment; during calculation of the heat release rate, lagging of measured data is not required to be considered, so that the heat release rate can be measured conveniently and easily in real time.

Description

technical field [0001] The invention relates to a method for measuring the heat release rate of a ventilated confined space, more particularly, to a method for measuring the heat release rate of a ventilated confined space based on a three-zone oxygen consumption method. 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 flue gas 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 during calculation, but in fact the combustion efficiency varies and is greatly affected by environmental factors; the cone calorimeter is used to measure the heat release rate on a small scale. However, the measurement scene is different from the real fire scene; the combustion flue gas analysis method is to collec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/22
CPCG01N25/22
Inventor 张英唐凯旋马出原黄咸家
Owner WUHAN UNIV OF TECH
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