Accumulation method for grillwork particle composite bed

Abstract

The invention relates to an accumulation method for a grillwork particle composite bed. The upper and lower layers of positioning grillworks and spherical particles are pre-assembled to form a spherical-layer entirety, a container is filled with the spherical-layer entirety layer by layer at the top of the container, when the grillworks and particles descend, the relative positions of the grillworks and particles are invariant, and an orderly accumulation structure can be automatically formed. According to the accumulation method for the grillwork particle composite bed, multiple different orderly accumulation modes and multi-gradient orderly accumulation structures can be achieved, and compared with a grilling particle composite accumulation bed, under the condition of maintaining the heat transfer characteristic at the same level, by reasonably designing an accumulation structure, the heat transfer performance is possibly further improved.

Description

technical field [0001] The invention belongs to the field of flow and heat transfer of porous media, and relates to a method for realizing an ordered stacked bed of composite particles. Background technique [0002] Particulate packed beds are widely used in industries such as catalytic reactors, high-temperature gas-cooled reactors, and granular energy storage. In the particle packed bed, the disordered packed bed is the most common method, because this kind of packing method is randomly generated, which has the advantage of low cost compared with other packing methods. However, previous studies have shown that because the particles in the disordered packed bed are randomly distributed, the flow channels of the fluid in it are complex and changeable, which makes the flow resistance very large and will cause high pressure drop loss. In addition, the inhomogeneity of the stacking structure will cause the inhomogeneity of flow and heat transfer, which reduces the heat transfe...

AI Technical Summary

Problems solved by technology

Although the composite stacking structure proposed by Calis et al. can improve the order of the particle arrangement and reduce the pressure drop, the structure is closely related to the shape of the single channel and the ratio of tube diameter to particle diameter; when the tube diameter particles in the single channel After the diameter ratio is increased, the stacking structure cannot be guaranteed to be orderly and controllable

[0005] It can be seen from several forms of packed beds at present that a highly ordered packed bed is conducive to the flow heat transfer process, but a completely ordered packed bed is difficult to achieve, and a composite packed bed with a second order degree cannot be done. to absolute order

Therefore, there is currently a lack of a method that can construct a controllable ordered structure

Images