[77f] - Detailed 3D Computer Model of a Pilot Plant
Multi-tubular Fisher-Tropsch Reactor: Experimental and Model
Results
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- Advance Gas Conversion II |
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- Alessandro G
Borsa (speaker)
- Blue Star Sustainable Tech
Corp
- 18200 W. Hwy 72
- Arvada, CO 80007
- Phone: 303-432-8630 ext
102
- Fax: 303-432-9446
- Email: aborsa@bluestarstc.com
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- Steven T
Harford
- Blue Star Sustainable Tech
Corp
- 18200 W. Hwy 72
- Arvada, CO 80007
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303-432-8630
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- Email:
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- Jun Z Zhang
- Blue Star Sustainable Tech
Corp
- 18200 W. Hwy 72
- Arvada, CO 80007
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303-432-8630
- Fax: 303-432-9446
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- Robert O
Savinelli
- Blue Star Sustainable Tech
Corp
- 18200 W. Hwy 72
- Arvada, CO 80007
- Phone: 303-432-8630 ext.
110
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- Email: rsavinelli@bluestarstc.com
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Abstract:
A 3D computer model of a pilot plant
Fisher-Tropsch (FT) reactor was developed as an analysis and
scale-up design tool. The FT pilot plant reactor modeled is a shell
and tube type with catalytic packed beds on the tube side (> 200
tubes) a heat transfer fluid on the shell side. The computer model
is composed of two integrated parts: one developed in gPROMS, an
equation based modeling environment, and the other developed in
StarCD, a commercially available computational fluid dynamic (CFD)
tool.
The exothermic catalytic packed beds and associated
tube walls are modeled in gPROMS. The gPROMS code is a commercially
available equation based simulation tool capable of solving large
complex systems of partial differential equations and differential
algebraic equations. gGPROMS is also capable of automatic parameter
estimation and optimization. The gPROMS part of the model consists
of a kinetic formulation for the surface formation of C1 to C30
hydrocarbon species, the mass and energy equations for the reacting
fluid mixture composed of a total of 35 individual chemical species,
the energy equation for the catalyst bed, the energy equation for
the tube wall, and empirical equations for computation of the
effective bed thermal conductivity and effective bed-wall heat
transfer coefficient. Multi-component radial diffusion as well as
bulk-surface reactant and product diffusion is included. All
equations in the model are distributed in the radial and axial
directions. The standard Anderson-Schultz-Flory model with dual
alpha describes the hydrocarbon product distribution. The gPROMS
automatic parameter estimation capability was used to optimize 7
model parameters from 15 sets of experimental data. The experimental
data was collected from a laboratory apparatus consisting of a
single vertical tube. The data sets consist of a 10-point
temperature profile along the centerline of the catalyst bed, the
water jacket temperature, the inlet flow rate and composition, the
outlet hydrocarbon product distribution, and the carbon monoxide
conversion.
The detailed model of the catalyst containing
tubes, validated against experimental data, was integrated with an
accurate CFD model of the shell side of the reactor. The CFD model
captured the flow and heat transfer characteristics of the high
temperature oil through the tube bundle and around the baffles. Oil
temperatures were passed from the CFD code to gPROMS and back
through several iterations until a final steady state solution was
reached.
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