Characteristics Analysis of the Blockage Zone in a Gas–Solid Fluidized Bed

Abstract

A gas−solid separation fluidized bed, which belongs to dry separation and can save a lot of water resources, is an important method for coal quality improvement. The effect of regional blockage of the air distributor on the fluidization effect was investigated by varying the blockage area and fluidization gas velocity, and the influence law of blockage of an air distributor on bed stability was revealed. In this paper, the micro-differential pressure sensor is used as a testing tool to analyze the regional characteristics of the fluidized bed blockage hole. The results show that when the air distributor is plugged, the standard deviations of the pressure fluctuation are largest at a height of 100 mm, all reaching more than 2.0, and that the pressure fluctuation at the bottom is greater than that at the top. When the plugged area fraction increases from 1/8 to 1/2, the density fluctuation range at the bottom of the plugged area decreases from 0.2 to 0.04 g/cm 3 , while the range of influence increases from 10 to 16 cm axially. With the increase of fluidization gas velocity, the mixing effect of particles is improved to an extent, and the range of the affected zone is gradually reduced.

Controlling Effect of Particle Size on Gas Hydrate Enrichment in Fine‐Grained Sediments

“…(1999), and Hillier (2003). The obtained results were quantified utilizing RockQuan and ClayQuan software (Yang et al., 2024; Zhou et al., 2023). The XRD analysis was carried out at both the Key Laboratory of Polar Geology and Marine Mineral Resources, Ministry of Education, and the Micro Structure Analytical Laboratory, Peking University.…”