الفهرس | Only 14 pages are availabe for public view |
Abstract Fluidized Bed Combustor (FBC), which utilizes the phenomenon of fluidization for the purpose of more efficient combustion, holds many promises for both reducing the amount of agricultural residue disposal and improving emissions from biomass combustion. In this research work, Egyptian sugarcane bagasse and cotton stalks, powders were bumed in a Bubbling Fluidized Bed Combustor (BFBC). The evaluation of design parameters of ~he fluidized bed combustor, the analysis of the fluidizing phenomena, the combustion and emissions characteristics, for sugarcane bagasse and cotton stalks fuels were investigated and discussed throughout this work. Understanding how a fluidized bed as a multi-phase flow system operates will improve its capabilities and operations. Particle Size Distribution (PSD) and chemical kinetic are important , , parameters used to characterize the hydrodynamic behavior and the combustion characteristics of a biomass material inside the fluidized bed combustor. The two biomass materials were collected and prepared for use and milled in a milling machine to serve as a powder fuel. PSD for the two materials was studied carefully to determine their physical characteristics that affected directly the hydrodynamics, pyrolysis, and combustion of the two materials in the BFBC. The PSD of the two biomass materials was calculated using three different methods. These methods were sieving analysis, statistical calculations, and image analysis (i.e. microscopy). Sieving analysis has been done mechanically using a mechanical sieve shaker and a series of nested standard sieves. A computer program called GRADIST AT has been used for the rapid analysis of grain size statistics from the standard measuring sieving techniques, and hand calculations were done for the satisfaction only. The results of statistical calculations showed that the sugarcane bagasse and cotton stalks samples were medium grained powders. The sieving analysis |