Explosion test device and method for uniformly distributed dust cloud in mixed gas environment

Abstract

The invention discloses an explosion test device and method for evenly distributing dust clouds in a mixed gas environment. The explosion test device includes an explosion chamber, a powder storage tank, a cleaning and replacement gas cylinder, a compressed gas cylinder, and a vacuum pump. The vacuum pump communicates with the explosion chamber through a pipeline. The cleaning and replacement gas cylinder is connected to the explosion chamber through the pipeline, the cleaning and replacement gas cylinder is connected to the powder storage tank through the pipeline, and the powder storage tank is connected to the explosion chamber through the gas-powder two-phase valve. Electromagnetic switches for controlling on-off are arranged on each pipeline. The valve, the powder storage tank and the explosion chamber are respectively connected with a gas harmless treatment device through pipelines. Before the explosion, by cleaning the replacement gas cylinder, the explosion chamber and powder storage tank can obtain an environment in which combustible gas or inert gas and oxidizing gas are uniformly mixed, and a dust cloud with uniform spatial distribution can be obtained through the dust dispersion nozzle, thereby simulating the characteristics of a dust explosion Precise test environment for parameters. The invention has reasonable structure and rigorous steps, and can be widely used in the technical field of dust explosion research.

Description

technical field [0001] The invention relates to the technical field of dust explosion research, in particular to an explosion test device and method for evenly distributing dust clouds in a mixed gas environment. Background technique [0002] In industrial production, it is often encountered that flying dust is mixed with combustible gas, and an explosion occurs when it encounters an open flame, such as the mixture of coal powder and methane. At the same time, in order to reduce the risk of dust explosion, inert gas is usually used to inert the dust environment to reduce the risk of explosion. Therefore, it is necessary to conduct quantitative research on the characteristic parameters of dust explosion under the above complex working conditions. However, the traditional 20L explosion test device has the following obvious deficiencies: 1. The function of gas cleaning and replacement in a dispersed environment is not proposed, and the characteristic parameters of dust explosio...

AI Technical Summary

Problems solved by technology

However, the traditional 20L explosion test device has the following obvious deficiencies: 1. The function of gas cleaning and replacement in a dispersed environment is not proposed, and the characteristic parameters of dust explosion cannot be effectively carried out under the condition of uniform premixing of combustible gas or inert gas and oxidizing gas. Test experiment; 2. The spatial distribution of dust dispersion based on traditional rebounding nozzles has obvious inhomogeneous characteristics. For dust with different physical and chemical properties, there are different preferred paths, and there is a large deviation from the formal concentration, resulting in dust explosion characteristic parameters, such as The confidence level of the test results such as the maximum explosion pressure, the maximum explosion pressure rise rate, and the minimum explosion concentration has been reduced, which has brought serious potential safety risks to the dust explosion risk assessment, design and application of explosion protection devices in the industry and trade.

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