Bubbling fluidized beds are granular systems, in which a deep layer of particles is set in motion by a vertical gas stream, with the excess gas rising as bubbles through the bed. We show that pressure fluctuations in such a system have non-Gaussian statistics. The probability density function has a power-law drop-off and is very well represented by a Tsallis distribution. Its shape is explained...

Effect of temperature on hydrodynamics of bubbling gas-solid fluidized beds was investigated.  Experiments were carried out in the range of 25-600 ºC and different superficial gas velocities in the range of 0.17-0.78 m/s with sand particles. Time-position trajectory of particles was obtained by radioactive particle tracking technique. These data were used for determination of mean velocitie...

Using woody biomass as a resource for production of biofuel, heat and power through gasification has been studied for years. In order to reduce the cost of operating and to design the full-scale gasification plant developing a general model to be applicable for different ranges of input data with acceptable level of accuracy, is needed. In order to develop such model for the gasifier, as the ma...

Some unwanted inorganic materials, such as alkaline compounds contained in biomass, have the potential to create slagging formations with oxide from either inside or outside bubbling fluidized bed (BFB). The process involved 88-125 µm silica sand and clay (bentonite) particles during pyrolysis KCl addition at 700°C represent biomass under superficialN 2 -velocity operation. Agglomeration format...

This paper aims to investigate the usage of waste from Absorbent Hygienic Products (AHP) as a fuel for gasification or pyrolysis, two attractive routes obtain valuable products and dispose this kind waste. The study experimentally investigated devolatilization coarsely shredded materials diapers, in laboratory-scale bubbling fluidized bed made sand, representative preparatory step above-mention...

This work compares the transient behaviors of flue gas sides large-scale bubbling and circulating fluidized bed (BFB CFB, respectively) boilers. For this purpose, a dynamic model in-furnace side combustors presented validated by authors in former is used to simulate two industrial units. The results show that for load changes heat transfer waterwalls stabilizes more rapidly BFB Differences stab...