(421f) Flow Pattern Evolution Law and Mechanism Analysis of Biomass Particles in Horizontal Pipe

The analysis of flow patterns in pneumatic conveying processes is crucial for optimizing the design and operation of conveying systems. The pneumatic conveying flow pattern primarily encompasses three aspects: solid particle movement, gas phase flow, and gas-solid interaction. Electrical Capacitance Tomography (ECT) was an effective and advanced measure method that was used to research flow patterns in rice husk powder dense-phase pneumatic conveying with a solid–gas ratio of 60–100 kg/kg. The evolution of the flow pattern in the pipe and the concentration distribution in the cross-section were characterized by ECT. The impact of gas velocity on solid deposition, gas phase flow, and the gas-solid interaction area in the pipeline was analyzed. Plug flow, fluidized flow, annular flow and stratified flow were observed in the horizontal pneumatic conveying. The relationship between Reynolds number and Archimedes number was used to predict the transition of these flow patterns. By examining the gas-solid interaction, the physical mechanism of the biomass flow pattern in the pipeline was explored, and a gas-solid interaction model was established to comprehend the operational principles of the pneumatic conveying system. This model offered a theoretical foundation for optimizing the design and operation of the system.