A Flameless Pyrolysis and Flame Combustion Experiment Box for Materials That Can Change Environmental Pressure and Atmospheric Conditions

Abstract

The invention relates to a material flameless pyrolysis and flame combustion experiment box capable of changing the environmental pressure and atmosphere conditions. Compared with the prior art, it solves the problem that there is no experimental device suitable for the research of material flameless pyrolysis and flame combustion characteristics. Defects. The invention comprises a reaction box, the side of the reaction box is movably equipped with an experiment box door, an observation window is arranged on the door of the experiment box, an air inlet is opened at the bottom of the reaction box, the air inlet pipe is connected to the air inlet and The pipeline is located outside the reaction box, and the reaction box is provided with an air outlet, a radiation source terminal and an aviation plug, and a pressure sensor is installed on the air outlet, and also includes an air inlet assembly, an air outlet assembly and a radiation source assembly. The invention not only has the fire research experiment function of the conventional low-pressure experiment box, but also can be used for the experiment research of flameless pyrolysis and flame combustion characteristics of solid combustibles.

Description

technical field [0001] The invention relates to the technical field of research on flameless pyrolysis and flaming combustion characteristics of solid combustibles in fire, in particular to a material flameless pyrolysis and flaming combustion experimental box capable of changing environmental pressure and atmosphere conditions. Background technique [0002] With the rapid development of my country's national economy, major vicious fires and explosions occur frequently, directly endangering people's lives and property, causing environmental pollution, and causing ecological imbalance. Reducing the harm of fire and related disasters to human production, life and resource environment has become one of the major problems that need to be solved urgently. One of the key points in fire science research is the study of the combustion characteristics of solid combustibles, because there are many solid combustibles around the life, which have certain fire hazards. Solid combustibles...

AI Technical Summary

Problems solved by technology

In Comparative Document 1, the supplementary air intake valve is directly connected to the outside world, and cannot provide a nitrogen-oxygen mixture or a pure nitrogen environment, and cannot change the nitrogen-oxygen mixture ratio or change the atmospheric conditions.

[0007]2. There are deficiencies in the design of the vacuum pump

When the experimental set pressure is reached, the vacuum pump needs to be turned off for the experiment, and after the vacuum pump is turned off, the dynamic balance of the pressure in the box cannot be maintained

[0009]3. Not equipped with a stable radiation source

[0010] In reference document 1, the design of electronic igniter is difficult to provide the stable radiant heat flow required by flameless pyrolysis and flame combustion, and cannot meet the requirement of flameless combustion of solid combustibles. Requirements for pyrolysis and flaming combustion experiments

And the electronic igniter cannot be moved, and it is difficult to ensure that the experimental samples are under the same heat flow during the experiment.

[0011] Another example is Patent Application No. 201310645998.6, which discloses a low-pressure aircraft cargo hold fire experiment simulation device for simulating liquid oil pool fires in aircraft cabin fires. The internal environment simulates the environment in the aircraft cabin, which limits the scope of use of the experimental device

The pressure adjustment range is above 30kPa, and the pressure range of the study is narrow, and it cannot involve the extreme low pressure, which limits the research on flameless pyrolysis and flame combustion of solid combustibles under different pressures

In addition, the aircraft cargo compartment is too large, so that the environmental monitoring points in the box are inconsistent with the state (air pressure, oxygen concentration, etc.) near the sample, and the pressure and oxygen concentration near the sample are important factors affecting the experiment. It is an important control variable in the flameless pyrolysis and flaming combustion experiments of substances, so it cannot be applied

[0012] Another example is Patent Application No. 201410209817.X, which discloses a combustion device for the study of soot characteristics in a low-pressure environment, which is used for soot characteristics of liquid oil pool fires The design of the experimental box is only suitable for the study of the characteristics of liquid oil pool fire soot, which limits the scope of use of the experimental device

The pressure adjustment range is above 30kPa, and the pressure range of the research is narrow, and it is also unable to involve the extreme low pressure situation, which limits the research on flameless pyrolysis and flame combustion of solid combustibles under different pressures

[0013] Another example is the patent document whose patent application number is 201310752345.8, which also discloses a fire test chamber with variable low pressure and variable oxygen concentration. Flame pyrolysis and flaming combustion studies

In addition, due to the lack of variable-frequency vacuum pumps (or regulating valves and vacuum pumps), the stability of pressure regulation needs to be improved, and it may also lead to the inability to continue pressure control after the experiment starts, and the pump needs to be stopped, and the tank is too large, which may make the tank The environmental monitoring point in the sample is inconsistent with the state (air pressure, oxygen concentration, etc.) near the sample

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