Title:
Energetic Analysis of Gasification of Aqueous Biomass in Supercritical Water
Author(s):
Marias, F., Letellier, S., Cezac, P., Serin, J.P., Demarthon, R.
Document(s):
Paper
Abstract:
The aim of this work is to investigate the field of gasification of aqueous biomass in supercritical water. In order to achieve this analysis, a mathematical model (based on thermodynamical equilibrium assumption) is built. This model allows not only for the computation of the solid, liquid and gas phases produced in a process composed of a gasification reactor and a separator unit, but also, for the computation of the energy requirements or yield in these specific units. The composition of these three phases is computed in terms of fractions of CH4, H2, H2O, CO, CO2, H2S, NH3, C6H5OH, CH3COOH, CH3CHO, C(s) and minerals. The model also predicts the lower heating value of the gas leaving the process. The main problem that is encountered in the derivation of this mathematical model is the estimation of the activities of the chemical species present in the mixture as well as the enthalpy of this mixture. In this work, these evaluations are performed using Peng-Robinson equation of state. Results of the model are presented in the frame of gasification of vinasse which is an aqueous residue from the alcohol production industry. It is shown that some specific conditions exist where it is not necessary to yield energy to the reactor to convert the incoming biomass into a gas for which the lower heating value can reach 5MJ/kg with a gasification efficiency of 85%.
Keywords:
gasification, modelling, wastewater, modeling, supercritical
Topic:
Thermochemical conversion - Gasification for power and CHP and polygeneration
Subtopic:
Gasification for power and CHP and polygeneration
Event:
18th European Biomass Conference and Exhibition
Session:
VP2.1.8
Pages:
649 - 656
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-VP2.1.8
Price:
FREE
