Modeling of Fluidized Bed Gasification of Rice Straw in Egypt

Abstract

Useful energy can be extracted from agricultural waste and residues instead of the uncontrolled burning that causes severe harm to the environment. Rice straw can be combusted in a fluidized bed producing useful heat with better control of emissions. One of the most promising alternatives is converting biomass into a more energy-dense fuel with a higher heating value through gasification. This study presents a one-dimensional model of atmospheric bubbling fluidized bed and investigates the effect of different operating parameters on the temperature profile and gas species concentrations through the fluidized bed in the gasification process through concentration and energy balance equations. The model is validated with data and measurements from the literature. The temperature profiles show a peak temperature value occurring early in the freeboard zone. Both the value and position of the peak occurrence are affected by the operation and fluidization condition.

Thermal modeling and efficiency assessment of an integrated biomass gasification and solid oxide fuel cell system

“…The peak temperature value and position varies with the fluidization operating parameters. Overheating phenomenon is reported to occur in fluidized beds in the literature [38,39,52,53] especially with fluidized bed combustor.…”

“…For the temperature profile through the gasifier, a model of fluidized bed gasifier is considered. The introduced model considers the bed zone, splashing zone and freeboard zone [39]. It is designed to simulate the temperature distribution and gas species concentration through the fluidized bed for fluidized bed gasification and fluidized bed combustion processes.…”

Techno-economic Feasibility of Renewable Energy Based Stand-alone Energy System for a Green House: Case Study

“…Currently and since 1999, Egypt suffers from a seasonal challenging black cloud of think layers of smog that is formed from burning rice straw after the harvesting season. The government put in effect certain laws and restrictions to seize this issue (El-Emam and Dincer, 2014). The main target is setting the required standards and regulations to organize the waste management sector.…”