Prediction of the lignocellulosic winery wastes behavior during gasification process in fluidized bed: Experimental and theoretical study

RODRIGUEZ, ROSA; MAZZA, GERMAN; FERNANDEZ, ANABEL; SAFFE, ALEJANDRA; ECHEGARAY, MARCELO

Journal of Environmental Chemical Engineering

Elsevier

Lugar: Londres; Año: 2018

2213-3437

This work presents studies about the gasification of thelignocellulosic winery wastes in fluidized bed to obtain energy. Based onthe exergy analysis, the exergetic improvement potential (IP) andsustainability index (SI) variations with different operational variableswere analyzed. IP increases and SI decreases when moisture content, ERand SBR augment. On the other hand, both indexes present contrarybehavior with the temperature increasing.Additionally, the kinetic behavior was investigated using a macro thermo-balance. The thermal decomposition of the studied biomass wastes at three heating rate, 5, 10 and 15K/min under steam/air mixture atmosphere showthat the gasification takes place in three visible stage: watervaporization, pyrolysis and the last step associated with the reaction ofthe char by CO2. The distributed activation energy model method (DAEM)was used. The decomposition is not a single reaction stage, it includesthe contributions of parallel reaction steps on the global reaction rate.Last, the fluidization was analyzed using air at room temperature andlocal atmospheric pressure. Each experiment was carried out with 100% and75% v lignocellulosic wastes. Segregation, slugging and channelization inall studied cases. However, the addition of sand particles improves thebehavior of both winery wastes.