This work aims at gaining novel knowledge of the mechanisms governing solids flow pattern in furnace large-scale Circulating Fluidised Bed (CFB) boilers. A fluid-dynamically down-scaled unit resembling an existing 200-MWth CFB boiler was built and validated against full-scale data. The extensive experimental campaign showed, among others, that presence or absence a dense bed governs entrainment...

The design of furnaces and boilers for solid fuels is supported increasingly by powerful softwares and ever faster computers. A round-robin over the most important CFD (computational fluid mechanics) models and softwares currently available shows, however, that numerical procedures for particle/turbulence interactions are not (yet) very advanced. Particle/fluid interphase slip is considered, bu...

Liquid-solid fluidisation is frequently encountered in drinking water treatment processes, often to obtain a large liquid-solid interfacial surface area. A area crucial for optimal seeded crystallisation full-scale softening reactors. Due crystallisation, particles grow and migrate lower zone the reactor which leads stratified bed. Larger adversely affect To maintain process conditions fluidise...

This work aims to evaluate the hydrodynamic properties of the sludge bed of Upflow Anaerobic Sludge Blanket (UASB) reactors based on its settleability and expansion characteristics. The methodologies used for the evaluation of the settleability of aerobic activated sludge, and for the expansibility of a sludge bed of Expanded Granular Sludge Bed reactors and Fluidised Bed Reactors were adapted ...

In this study, molochite (calcined kaolin) and dolomite with particle sizes (ca.1 mm) similar to those of the sand bed materials industrial-scale fluidised beds, rather than powders which were normally used by previous studies, investigated as additives counter agglomeration combustion wheat straw miscanthus pellets in a 20 kW th bubbling combustor under both conventional air oxy-fuel condition...