Stepwise Analysis Of Reactions And Reacting Flow
In A Dual Fluidized Bed Gasification Reactor
Author(s)
R. K. Thapa & B. M. Halvorsen
Abstract
Dual fluidized bed gasification reactors are used in a wide range of biomass
conversion processes. Some of the important processes are steam gasification of
biomass for combined heat and power (CHP) production and synthesis processes
leading to production of liquid and gaseous biofuels. Gas-solid multiphase flow
and thermochemical processes are responsible for overall performance of the
reactor. The multiphase flow involves reacting flow of solids (biomass and bed
materials) with gases (steam and product gas components). The thermochemical
process involves devolatilization of wood followed by steam gasification, CO2
gasification, methanation, water gas shift and methane reforming. In order to
optimize the performance of the reactor, it is important to study each of the
global reaction and their reacting flow separately.
A computational model has been developed to study the reaction kinetics and
the reacting flow in a dual fluidized bed gasification reactor. The model has been
validated against the measurements of gas composition in an operating plant for
biomass gasification. The reactions are simulated individually using commercial
Computational Particle Fluid Dynamic (CPFD) software Barracuda VR 15. The
results of simulations such as product gas compositions (CO, CO2, CH4, and H2),
wood particle volume fraction and char particle volume fractions are compared
for each individual reaction. The results show each of the global reaction
contributes to the product gas composition differently. The volume fractions of
wood and char particles show that the residence time of wood and char particle
in the reactor is different for different reactions. The contribution of
devolatilization, steam gasification and water-gas shift in the product gas heating
value is more significant than others.
Keywords: biomass gasification reactor, dual fluidized bed, CPFD, steam
gasification, reaction kinetics, reacting flow.
Keywords
biomass gasification reactor, dual fluidized bed, CPFD, steamgasification, reaction kinetics, reacting flow.
Related Book
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