Combustible burning rate test device in plateau artificial oxygen-enriched environment

Abstract

The invention provides a testing device for the combustion rate of combustibles in a plateau artificial oxygen-enriched environment, belonging to a field of fire safety. The testing device consists of the following seven parts: a combustion chamber, a positioning mechanism, an air distribution system, an airflow-circulation and concentration-monitoring system, a vacuum-pumping system, an ignition system and a data acquisition system. A sample is arranged on a sample support by a sample clamper, and then vacuum-pumping is carried out to a sealed chamber by the vacuum-pumping system; each single high-purity gases are mixed in the sealed chamber after passing through a mass flowmeter and a flow regulating valve; the total pressure of the gases is displayed by a high-precision vacuum manometer; when the requirements of the total pressure of the gases and gas compositions are met, a micro-air pump is started to mix the airflow in the sealed chamber; a laser light source is started to ignite the sample after the concentration of the gas compositions is steady; the sample combustion flame passes through two thermocouples sequentially; temperature change curves of the thermocouples are obtained by A / D conversion and the data acquisition system; and the time between two maximum temperature points of the curves corresponding to the two thermocouples is taken as the combustion time of the sample between the thermocouples with fixed distance, thus obtaining the combustion rate of the sample under the total pressure of the gases and the concentration of the gas compositions. The testing device has stable and reliable testing performance, and is simple and convenient.

Description

technical field [0001] The invention belongs to the field of fire safety, and relates to a combustible combustion rate test device in a plateau artificial oxygen-enriched environment, which is suitable for measuring the combustion rate of combustibles at different altitudes. Background technique [0002] With the deepening of the western development and the completion and opening of the Qinghai-Tibet Railway, more and more people have entered the western plateau area for production and construction. People in the plain area will experience great discomfort due to the reduction of oxygen content in the air after entering the plateau, manifested as chest tightness, shortness of breath, fatigue, memory loss, insomnia, irritability, headache, dizziness, and even pulmonary edema, cerebral edema and other diseases. endanger human life. Therefore, oxygen enrichment is the main way to solve the plateau hypoxia in the interior of the plateau area or in the train compartment to the p...

AI Technical Summary

Problems solved by technology

The problem with this ignition method is that the consumption of oxygen during the ignition process will change the oxygen concentration in the sealed chamber; in addition, the fuel gas will enter the combustion chamber, which will affect the experimental results

Since the ignition of the resistance wire cannot ignite the specimen instantly, thermal radiation will cause the temperature of the indoor environment to rise, and during the heating process of the resistance wire, the specimen will also be heated, thus affecting the combustion process of the sample

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