Modelling of fluidized bed biomass gasification in the quasi-equilibrium regime for preliminary performance studies of energy conversion plants

Abstract

Thermodynamic equilibrium-based models of gasification process are relatively simple and widely used to predict producer gas characteristics in performance studies of energy conversion plants. However, if an unconstrained calculation of equilibrium is performed, the estimations of product gas yield and heating value are too optimistic. Therefore, reasonable assumptions have to be made in order to correct the results. This paper proposes a model of the process that can be used in case of deficiency of information and unavailability of experimental data. The model is based on free energy minimization, material and energy balances of a single zone reactor. The constraint quasiequilibrium calculations are made using approximated amounts of non-equilibrium products, i.e. solid char, tar, CH 4 and C 2 H 4 . The yields of these products are attributed to fuel characteristics and estimated using experimental results published in the literature. A genetic algorithm optimization technique is applied to find unknown parameters of the model that lead to the best match between modelled and experimental characteristics of the product gas. Finally, generic correlations are proposed and quality of modelling results is assessed in the aspect of its usefulness for performance studies of power generation plants.

Comparative Analysis of Alternative Configurations of the Mercury 50 Recuperated Gas-Turbine-Based Biomass Integrated Gasification Combined Heat and Power (BIGCHP) Plant

“…These components are just withdrawn from the substrates and bypass the calculation of equilibrium. The details of the model are given in the text published in another journal . Table presents predicted characteristics of raw and product gas from different gasification technologies that are taken into account in this study.…”

Hydrogen-Rich Syngas Production from Chemical Looping Gasification of Biomass Char with CaMn1–xFexO3

“…The results show that the H 2 yield increased from 2.61 to 3.58 mol/g, while the CO yield decreased from 0.91 to 0.64 mol/g. The SC showed that its value decreased, and carbon conversion increased in Figure b. , Hence, plenty of water flow enhanced contact to facilitate the char gasification, and the steam flow is one of the necessary conditions to increase the yield of H 2 .…”

“…The SC showed that its value decreased, and carbon conversion increased in Figure 9b. 56,57 Hence, plenty of water flow enhanced contact to facilitate the char gasification, and the steam flow is one of the necessary conditions to increase the yield of H 2 .…”

Thermochemical analysis of a flue gas-driven biomass gasification

“…However, the method can be used successfully at the design stage of gasification systems and during the preliminary optimisation of their basic parameters Nevertheless, it is not possible to validate the parameters of the process with the computational data before the results of the experimental analysis are known. Such experimental results allow to identify the computational model (Kozaczka, 1994;Kalina, 2011).…”