Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Review and a Methodology to Investigate the Effects of Monolithic Channel Geometry

[+] Author and Article Information
Christopher D. Depcik

e-mail: depcik@ku.edu

Austin J. Hausmann

Department of Mechanical Engineering,
University of Kansas,
3138 Learned Hall,
1530 W. 15th Street,
Lawrence, KS 66045-4709

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received April 10, 2012; final manuscript received October 11, 2012; published online February 21, 2013. Assoc. Editor: Song-Charng Kong.

J. Eng. Gas Turbines Power 135(3), 032301 (Feb 21, 2013) (16 pages) Paper No: GTP-12-1101; doi: 10.1115/1.4007848 History: Received April 10, 2012; Revised October 11, 2012

A typical monolithic catalyst consists of long, narrow, square channels containing a washcoat of catalytic material. While this geometry is the most common, other shapes may be better suited for particular applications. Of interest are hexagonal, triangular, and circular channel geometries. This paper provides a succinct review of these channel shapes and their associated heat and mass transfer correlations when used in a one plus one-dimensional model including diffusion in the washcoat. In addition, a summary of the correlations for different mechanical and thermal stresses and strains are included based on channel geometry. By including the momentum equation in the model formulation with geometry specific friction factors, this work illustrates a unique optimization procedure for light off, pressure drop, and lifetime operation according to a desired set of catalyst specifications. This includes the recalculation of washcoat thickness and flow velocity through the channels when cell density changes.

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Fig. 1

Dimensions of cell geometries for (a) square, (b) hexagonal, (c) circular, and (d) triangular

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Fig. 2

Carbon monoxide light-off experiment with reaction rate calibrated to match the temperature at 50% conversion using square channels while illustrating the difference between heat and mass transfer correlations of the other channels

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Fig. 3

Wall thickness and cell density parametric study for square channels

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Fig. 4

Wall thickness and cell density parametric study for hexagonal channels

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Fig. 5

Wall thickness and cell density parametric study for triangular channels

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Fig. 6

Wall thickness and cell density parametric study for circular channels

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Fig. 7

Holding MIF and washcoat amount constant while increasing the cell density

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Fig. 8

Holding light-off and washcoat amount constant while increasing the cell density

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Fig. 9

Strain tolerance, modulus of rupture, and elastic modulus as a function of porosity of the monolithic material for a standard, unwashcoated square geometry catalyst




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