............................................................................................................. iii LIST OF TABLES ................................................................................................. viii LIST OF FIGURES ................................................................................................. ix

Gasification systems, such as coal-based integrated gasification combined cycle (IGCC) systems for power generation and byproduct recovery, are complex technologies. Process simulators, such as ASPEN, have typically been used to evaluate the performance, emissions, and costs of these technologies. Process simulation models are sufficiently large that they can only be executed on workstations or...

Article history: Received 1 October 2006 Received in revised form 20May 2007 Accepted 20 June 2007 Co-combustion of chicken litter (CL) with coal was performed in a laboratory-scale fluidized bed combustor to investigate the effect of CL combustion on pollutant emissions. The emissions of major gaseous pollutants including CO, SO2, H2S and NO and temperature distribution along the combustor wer...

The objective of this work is to show a procedure for mesh generation in a fluidized bed using large eddy simulations (LES) of a filtered two-fluid model. The experimental data were obtained by [1] in a laboratory fluidized bed. Results show that it is possible to use mesh with less cells as compared to RANS turbulence model with granular kinetic theory flow (KTGF). Also, the numerical results ...

To numerically study biomass gasification in a three-dimensional bubbling fluidized bed, CFD-DEM (computational fluid dynamics – discrete element method) model with heat transfer and homogeneous heterogeneous chemical reactions is implemented. An ideal reactor used for the air-steam bed (BFB) assuming perfectly mixed solids plug flow. A validated computational particle (CPFD) has been applied t...

A gasifier employs partial ignition of biomass and conversion to gaseous fuels high calorific value. Bubbling fluidized bed is a promising one amongst other gasification technologies like fixed bed, entrained flow etc. It has several noteworthy advantages large- small-scale applications, efficient heat mass transfer rates due its fuel flexibility, low capital operating costs, However, mixing ra...

the presence of particles in liquid-solid fluidized beds enhances the bed heat transfer, because the movement of the particles leads to an increased turbulence in the system. moreover, the violent movement of the particles has a positive effect on fouling of the heat transfer surface. the aim of this investigation was to perform systematic measurements of bed voidage and heat transfer coefficie...

Abstract Purpose This study aimed to determine whether ammonia can genuinely help reduce the carbon footprint of maritime activities. Given this, it was decided investigate life cycle and its impact on environment regarding global warming potential. Methods To achieve this goal, parametric trend assessment applied yield a general reliable observation. The research combined with comprehensive da...

The fluidization characteristics of binary mixtures containing tobacco stem (TS) and cation exchange resin (a substitute for coal) were studied in a rectangular bed with the cross-section area of 0.3 × 0.025 m(2). The presence of herbaceous biomass particles and their unique properties such as low density and high aspect ratio resulted in different fluidization behaviors. Three fluidization vel...