Research Papers

Coal Ash Deposition on Nozzle Guide Vanes—Part I: Experimental Characteristics of Four Coal Ash Types

[+] Author and Article Information
J. P. Bons

Department of Mechanical and Aerospace Engineering,
Ohio State University,
Columbus, OH 43235

N. P. Padture

Department of Materials Science Engineering,
Ohio State University,
Columbus, OH 43235

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 31, 2011; final manuscript received September 1, 2011; published online November 8, 2012. Editor: David Wisler.

J. Turbomach 135(2), 021033 (Nov 08, 2012) (9 pages) Paper No: TURBO-11-1199; doi: 10.1115/1.4006571 History: Received August 31, 2011; Revised September 01, 2011

An accelerated deposition test facility was operated with four different coal ash species to study the effect of ash composition on deposition rate and spatial distribution. The facility seeds a combusting (natural gas) flow with 10–20 micron mass mean diameter coal ash particulate. The particulate-laden combustor exhaust is accelerated through a rectangular-to-annular transition duct and expands to ambient pressure through a nozzle guide vane annular sector. For the present study, the annular cascade consisted of two CFM56 aero-engine vane doublets, comprising three full passages and two half passages of flow. The inlet Mach number (0.1) and gas temperature (1100 °C) are representative of operating turbines. Ash samples were tested from the three major coal ranks: lignite, subbituminous, and bituminous. Investigations over a range of inlet gas temperatures from 900 °C to 1120 °C showed that deposition increased with temperature, though the threshold for deposition varied with ash type. Deposition levels varied with coal rank, with lignite producing the largest deposits at the lowest temperature. Regions of heightened deposition were noted; the leading edge and pressure surface being particularly implicated. Scanning electron microscopy was used to identify deposit structure. For a limited subset of tests, film cooling was employed at nominal design operating conditions but provided minimal protection in cases of severe deposition.

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Wenglarz, R. A., and Fox, R. G.Jr., 1990, “Physical Aspects of Deposition From Coal-Water Fuels Under Gas Turbine Conditions,” ASME J. Eng. Gas Turb. Power, 120, pp. 9–14. [CrossRef]
Kim, J., Dunn, M. G., and Baran, A. J., 1993, “Deposition of Volcanic Materials in the Hot Sections of Two Gas Turbine Engines,” ASME J. Eng. Gas Turb. Power, 115, pp. 641–651. [CrossRef]
Dunn, M. G., Baran, A. J., and Miatech, J., 1996, “Operation of Gas Turbine Engines in Volcanic Ash Clouds,” ASME J. Eng. Gas Turb. Power, 118, pp. 724–731. [CrossRef]
Wenglarz, R. A., 1992, “An Approach for Evaluation of Gas Turbine Deposition,” ASME J. Eng. Gas Turb. Power, 114, pp. 230–234. [CrossRef]
Bogard, D. G., Schmidt, D. L., and Tabbita, M., 1998, “Characterization and Laboratory Simulation of Turbine Airfoil Surface Roughness and Associated Heat Transfer,” ASME J. Turbomach., 120, pp. 337–342. [CrossRef]
Hussein, M. F., and Tabakoff, W., 1971,“Computation and Plotting of Solid Particle Flow in Rotating Cascades,” Comput. Fluids, 2(1), pp. 1–15. [CrossRef]
Tabakoff, W., and Hussein, M. F., 1971, “Trajectories of Particles Suspended in Flows Through Cascades,” J. Aircraft, 8(1), pp. 60–64. [CrossRef]
Tafti, D. K., and Sreedharan, S. S., 2010, “Composition Dependent Model for the Prediction of Syngas Ash Deposition With the Application to a Leading Edge Turbine Vane,” ASME Turbo Expo 2010: Power for Land, Sea, and Air.
Barker, B., Casaday, B., Shankara, P., Ameri, A., and Bons, J. P., 2011, “Coal Ash Deposition on Nozzle Guide Vanes—Part II- Computational Modeling,” ASME Turbo Expo 2011: Power for Land, Sea, and Air, Jun.14–18 , Vancouver, Canada, Paper # GT2011-46660.
Lawson, S. A., and Thole, K., 2011, “The Effects of Simulated Particle Deposition on Film Cooling,” ASME J. Turbomach., 133(2), p. 021009. [CrossRef]
Vandsburger, U., Tafti, D., and Ng, W., 2009, “Syngas Particulate Deposition and Erosion at the Leading Edge of a Turbine Blade With Film Cooling,” University Turbine Systems Research Workshop, Oct.27–29 , Orlando, FL.
Jensen, J. W., Squire, S. W., Bons, J. P., and Fletcher, T. H., 2005, “Simulated Land-Based Turbine Deposits Generated in an Accelerated Deposition Facility,” J. Turbomach., 127, pp. 462–470. [CrossRef]
Crosby, J. M., Lewis, S., Bons, J. P, Ai, W., and Fletcher, T. H., 2008, “Effects of Temperature and Particle Size on Deposition in Land Based Turbines.” ASME J. Eng. Gas Turb. Power, 130(5), p. 051503. [CrossRef]
Smith, C., Barker, B., Clum, C., and Bons, J., 2010 “Deposition in a Turbine Cascade With Combusting Flow,” ASME Turbo Expo 2010: Power for Land, Sea, and Air, June2010, Glasgow, Scotland, Paper #:GT2010-22855.
Coleman, H. W., and Steele, W. G., 1999, Experimentation and Uncertainty Analysis for Engineers. 2nd ed., Wiley Interscience, New York.
Chambers, J. G., 1985, “The Volcanic Cloud Encounter of a Rolls-Royce Powered Boeing 747 of the British Airways Fleet 24 June 1982,” Internal Rolls-Royce Report.


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Fig. 4

Particle size distribution for all tested ash types

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Fig. 3

Cutaway of TuRFR measurement and viewing area

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Fig. 2

Schematic of TuRFR showing primary flow path, particulate, fuel, and film cooling insertion points

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Fig. 1

Volcanic ash deposition damage to high pressure turbine rotor (from Kim et al. [2])

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Fig. 5

Side by side comparison of (a) bituminous, (b) PRB, (c) JBPS, and (d) lignite coal ash deposits. Test conditions in Table 2.

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Fig. 6

Sixty seconds into JBPS subbituminous fly ash test- 1044 °C; see Table 2

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Fig. 7

JBPS fly ash ∼1056 °C, 11 min into test

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Fig. 8

Surface metrology of vanes with JBPS ash deposit. Compare to Fig. 5(c).

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Fig. 11

SEM photo of (a) bituminous ash deposit and (b) JBPS ash deposit (black background is epoxy filler, test conditions are presented in Table 2)

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Fig. 12

EDS micrographs of JBPS fly ash, showing concentrations of Si, Al, and Ca (350 μm × 450 μm)

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Fig. 13

Comparison of bituminous fly ash tests (a) film cooling, (b) nonfilm cooling

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Fig. 14

Comparison of lignite fly ash tests (a) film cooling, (b) nonfilm cooling

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Fig. 9

Thickness comparison at (a) leading edge, (b) 37% chord, (c) 53% chord

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Fig. 10

Volcanic ash deposits on pressure surface of NGVs (from Chambers [16])



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