Particle Motion in the Vicinity of the Wall of Circulating Fluidized Beds

Jian Hui Liu; Shuan Shi Fan; Dong Lai Xie

doi:10.4028/www.scientific.net/AMR.614-615.3

Paper Titles

Preface and Conference Organization

Particle Motion in the Vicinity of the Wall of Circulating Fluidized Beds
p.3

Simulation of Supercharged Boiler Combustion Optimization Control Based on Radiant Energy Signal
p.8

Based on the Principle of Approximate Model Established Model Test Rig Simulation of the Actual Test Bench
p.14

Design Optimization of Convective Heat Transfer Surface of Pressurized Oxy-Fuel Coal-Fired Boiler
p.20

Investigation of Lignite Combustion Characteristics with Thermal Analysis
p.25

Precipitation Characteristics of Crystallization Fouling on Metal Surface from 0.5mmol/l CaCO₃ Solution at 35°C
p.31

Study on Thermodynamic Evaluation Index of Combined Cooling Heating and Power (CCHP) System
p.36

Study on the Technology of Increasing Combustion Efficiency and Decreasing NO_x Emission of Blending Coals
p.41

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 614-615Particle Motion in the Vicinity of the Wall of...

Particle Motion in the Vicinity of the Wall of Circulating Fluidized Beds

Abstract:

High-density circulating fluidized beds (CFB) differ in several respects from low-density CFB systems. In high-density CFB risers, solids move upward throughout the entire riser cross-section, and the net downflow of particles at the wall, a commonly observed feature of fast fluidized beds, is absent. Hence there exists a transition regime from the low density to high density CFB where the net particle motion in the vicinity of the wall is changing from downwards to upwards. This was confirmed by experiments carried in a dual-loop high-density CFB facility with concentric-tube heat exchanger installed in the riser. Local suspension-to-wall heat transfer coefficient and suspension temperature distribution below and above the heat exchange section were measured. Experimental results elucidated that particles move both upwards and downwards in the vicinity of the wall for the operation conditions studied. This alternation of direction leads to higher heat transfer coefficients at both ends of the heat exchange.