Dmj. Puchyr et al., HYDRODYNAMIC AND KINETIC MODELING OF CIRCULATING FLUIDIZED-BED REACTORS APPLIED TO A MODIFIED CLAUS PLANT, Chemical Engineering Science, 51(24), 1996, pp. 5251-5262
Simulations of circulating fluidized-bed (CFB) reactors applied to the
modified Claus process were performed to assess their potential for e
liminating the costly tail gas clean-up unit (TGCU) from a Claus plant
. The TGCU could be eliminated by achieving very high H2S conversions
in the catalytic reactors. Both the CFB regimes of pneumatic transport
and fast fluidization were examined. Moreover, a newly developed CFB
model accounting for the downflow of both the gas and solids in the an
nulus was applied to the fast fluidization regime. Recently published
intrinsic reaction kinetics were employed for the hydrolysis of the pr
oblematic COS and CS2 compounds on the Kaiser 201 alumina catalyst. Th
e simulation results were compared to the work of Birkholz et al. (198
7, Can. J. Chem. Engng 65, 778-784), who simulated the use of conventi
onal gas fluidized-bed converters in a Claus plant. The simulated thre
e reactor, adiabatic CFB system operating in the pneumatic transport r
egime was able to achieve an overall sulfur recovery of 96.2%. Removal
of H2O before each reactor improved the recovery to over 99%. Copyrig
ht (C) 1996 Elsevier Science Ltd