Method for online measurement of concentration of OH free radical in flame zone of Class B fire and flame device

A flame zone, free radical technology, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of lack of practicability, affecting measurement accuracy, and high level of laser OH interference, and achieving the effect of easy detection

Active Publication Date: 2010-08-04
SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, for laser optical absorption spectroscopy, the interference level of the laser generated by the OH is too high, which seriously affects the measurement accuracy; for the CO tracer oxidation method based on the chemical properties of OH; the auxiliary ion measurement and spin trapping method, in the study of fine water No implementability when fog interacts with fire mechanics

Method used

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  • Method for online measurement of concentration of OH free radical in flame zone of Class B fire and flame device
  • Method for online measurement of concentration of OH free radical in flame zone of Class B fire and flame device
  • Method for online measurement of concentration of OH free radical in flame zone of Class B fire and flame device

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Effect test

Embodiment 1

[0049] Embodiment 1: Laser-induced fluorescence method to measure the change of OH free radicals in the flame under the action of water mist

[0050] Build a self-made combustion device, turn on the power, add water to the humidifier at a water temperature of 15°C and a room temperature of 16°C, and use a separating funnel to add 90# gasoline in the cup to a height of 2cm. Preheat the humidifier for 20 minutes before the start of the experiment (there is a baffle between the humidifier and the upper flame device, the water mist will not flow to the upper layer during the preheating period, and will float out from the side port), after the preheating is over, ignite the Gasoline, after 5 minutes, use the software to control the laser, scan the flame area, then adjust the switch knob to the maximum, adjust the current to 0.550A, and adjust the baffle to make the water mist interact with the flame. After five minutes, scan again, each time The scan time is 2 seconds, multiple set...

Embodiment 2

[0067] Embodiment 2: Laser-induced fluorescence method to measure the change of OH free radicals in the flame under the action of water mist containing 1% additive

[0068] Build a self-made combustion device, turn on the power, add water containing 1% additives to the humidifier at a water temperature of 17°C and a room temperature of 18°C, and use a separating funnel to add 70# gasoline in the cup to a fixed height of 2.5cm. Preheat the humidifier for 20 minutes before the start of the experiment (there is a baffle between the humidifier and the upper flame device, during the preheating period, the water mist will not flow to the upper layer, but will float out from the side port). Gasoline, after 5 minutes, use the software to control the laser, scan the flame area, then adjust the switch knob to the maximum, adjust the current to 0.550A, and adjust the baffle to make the water mist interact with the flame. After five minutes, scan again, each time The scan time is 2 second...

Embodiment 3

[0075] Embodiment 3: Laser-induced fluorescence method to measure the change of OH free radicals in the flame under the action of water mist containing 2% additives

[0076] Build a self-made combustion device, turn on the power, add water containing 2% additives to the humidifier at a water temperature of 25°C and a room temperature of 26°C, and add 70# gasoline in the cup to a fixed height of 3cm with a separating funnel. Preheat the humidifier for 20 minutes before the start of the experiment (there is a baffle between the humidifier and the upper flame device, during the preheating period, the water mist will not flow to the upper layer, but will float out from the side port). Gasoline, after 5 minutes, use the software to control the laser, scan the flame area, then adjust the switch knob to the maximum, adjust the current to 0.550A, and adjust the baffle to make the water mist interact with the flame. After five minutes, scan again, each time The scan time is 2 seconds, ...

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Abstract

The invention discloses a method for online measurement of concentration of OH free radicals in a flame zone of Class B fire and a flame device. The method adopts the technology of laser-induced fluorescence to make a laser beam with the absorption wavelength of 308nm tuned to OH irradiate OH free radicals in a flame zone, so as to generate resonant transition from a low electronic state to a high electronic state. The excited molecules then self-radiate fluorescent. Under the condition that laser intensity and instrument conditions are maintained unchanged, the total fluorescence intensity is proportional to the concentration of the OH free radicals, thereby obtaining the concentration of the OH free radicals. The device of the invention comprises a pear-shaped funnel (1), a square combustion device (3), an oil cup (5), a mist rising control tube (6), a bracket (7) and a humidifier (8). The invention has the advantages of high measurement accuracy, simple structure and easy implementation.

Description

technical field [0001] The invention belongs to the field of laser combustion diagnosis, and in particular relates to a method and a device for measuring the concentration of OH free radicals in a flame zone during the combustion process of a Class B fire. Background technique [0002] The measurement of OH free radical concentration occupies a very important position in the study of the fire extinguishing mechanism of fine water mist. At present, the main method of research on the interaction mechanism between fine water mist and flame is still at the macroscopic interface. Some research methods have been reported in the literature, that is, using thermal imagers, thermal radiation flux meters, nickel-chromium-nickel-silicon thermocouples or nickel-chromium-silicon thermocouples. The constantan thermocouple measures the change of the flame temperature field during the interaction between the fine water mist and the flame. However, the accuracy of this method is not high. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 曹丽英潘仁明阙兴贵李燕李生有叶明生徐强高飞汪立
Owner SHANGHAI FIRE RES INST OF THE MIN OF PUBLIC SECURITY
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