Gas explosion pipeline experimental device and method with multi-dimensional concentration gradient

Abstract

The invention provides a gas explosion pipeline experimental device and method with a multi-dimensional concentration gradient. The gas explosion pipeline experimental device comprises a deflagrationpipeline, a gas supply device and an ignition device. The air supply device comprises a plurality of air inlet nozzles, a plurality of flow control valves, a multi-way valve, an electromagnetic valve,a pressure reducing valve and an air storage tank. The plurality of air inlet nozzles are distributed at the top of the deflagration pipeline and are divided into a plurality of groups; each group ofair inlet nozzles is connected with the same flow control valve, and the plurality of flow control valves are connected with the multi-way valve through the pressure reducing valve of the branch andthen are connected with the air storage tank through a main electromagnetic valve and a main pressure reducing valve; and the ignition device comprises an ignition unit and an ignition electrode, wherein the ignition electrode is arranged in the deflagration pipeline. The defect that only one-dimensional concentration gradient related tests can be carried out at present is overcome, and powerful help is provided for combustible gas explosion characteristic tests under complex multi-dimensional concentration gradients on site.

Description

technical field [0001] The invention belongs to the field of gas explosion pipeline experiments, in particular to an experimental device and method for gas explosion pipelines with multi-dimensional concentration gradients. Background technique [0002] The leakage of combustible gas in a confined space has the danger of explosion. When it leaks accidentally, it usually accumulates locally first, and then gradually diffuses to the entire confined space. During the diffusion period, methane-air is not uniformly distributed, but there is a concentration gradient. At this time May also explode if ignition source is present. It is of great practical significance to grasp the evolution law of concentration gradient in the process of combustible gas leakage and the characteristics of deflagration (combustion and explosion) under this condition (including flame behavior and pressure accumulation, etc.), and to design appropriate protection and mitigation measures. Existing experim...

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Problems solved by technology

Existing experimental methods and devices for gas explosion pipelines with concentration gradients all set the concentration gradient on the axial direction (direction) of the explosion pipeline, and the combustible gas in several unit length pipelines is still uniform. This ideal concentration There is a certain difference between the gradient and the complex concentration gradient on site, and the experimental results still cannot feed back the influence of the concentration gradient on site on the gas explosion behavior

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