Double-cylinder multi-fluidization circulating type aerosol generator

Abstract

The invention aims to provide a double-cylinder multi-fluidization circulating type aerosol generator which comprises an online continuous power supply portion, a powder fluidization and circulation portion, an air circuit control portion, a vibrating motor and a base frame. The online continuous power supply portion, the powder fluidization and circulation portion and the air circuit control portion are connected with one another. The vibrating motor, the online continuous power supply portion and the powder fluidization and circulation portion are all mounted on the base frame. The online continuous power supply portion is further connected with the base frame through support members. The double-cylinder multi-fluidization circulating type aerosol generator is simple to operate, unique in design, widely applicable to various viscous or non-viscous powder samples, and applicable to distribution of high-pressure systems.

Description

technical field [0001] The invention relates to a filter system performance testing device in the fields of nuclear energy, environmental protection, chemical industry and the like. Background technique [0002] The reactor containment is the last barrier to prevent the release of radioactive products into the environment. In the event of a serious accident in which the core melts through the pressure vessel, the pressure in the containment gradually increases due to the continuous increase of non-condensable gas produced by the reaction between the molten core and the concrete bottom plate, which may eventually destroy the integrity of the containment and cause radioactive substances Leaked. In order to prevent such accidents, nuclear power plants generally adopt containment filtration and discharge systems at present. The pressure in the containment does not exceed its load limit by means of active pressure relief, so as to ensure the integrity of the containment; at the ...

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Problems solved by technology

However, the currently used powder absorption-distribution devices are mainly nozzles, diffusers or other negative pressure generating devices. The structure and principle of these devices determine that they cannot handle the aerosols carried by mechanical moving parts under high outlet pressure conditions. The solid powder is normally absorbed, so the outlet pressure of the existing solid powder aerosol generating device is low (the maximum outlet pressure does not exceed 0.3MPa), and cannot be used for aerosol distribution in high-pressure systems

Therefore, it does not meet the experimental requirements for the verification of aerosol filtration efficiency in the containment filtration and discharge system

[0006] 2. Since the aerosol particles in the atmosphere of the containment are viscous powders, in order to simulate the characteristics of the aerosol in the containment and verify the efficiency of the containment filtration and discharge system, it is necessary to add viscous powder to the containment filtration and discharge system; but the viscous powder High viscosity, poor fluidity, prone to spontaneous coagulation, showing strong agglomeration characteristics

However, most of the existing solid powder aerosol generators only disperse the powder once, so it is difficult to ensure the sufficient fluidization of the viscous powder. Spontaneous coagulation causes powder agglomeration, which brings certain difficulties to the fluidization of the powder. These problems seriously affect the accuracy of the efficiency test of the containment filtration and discharge system, so the existing solid powder aerosol generating device is not suitable For the divergence and distribution of viscous powder, it cannot meet the experimental requirements

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