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Research Papers

A Validation/Uncertainty Quantification Analysis for a 1.5 MW Oxy-Coal Fired Furnace: Sensitivity Analysis

[+] Author and Article Information
Oscar H. Díaz-Ibarra

Department of Chemical Engineering,
University of Utah,
Salt Lake City, UT 84112
e-mail: ohdiazi@gmail.com

Jennifer Spinti

Department of Chemical Engineering,
University of Utah,
Salt Lake City, UT 84112
e-mail: Jennifer.Spinti@utah.edu

Andrew Fry

Chemical Engineering Department,
Brigham Young University,
Provo, UT 84602

Benjamin Isaac, Michal Hradisky

Institute for Clean and Secure Energy,
University of Utah,
Salt Lake City, UT 84112

Jeremy N. Thornock, Sean Smith, Philip J. Smith

Department of Chemical Engineering,
University of Utah,
Salt Lake City, UT 84112

Manuscript received February 17, 2017; final manuscript received June 12, 2018; published online July 13, 2018. Assoc. Editor: Sumanta Acharya.

J. Verif. Valid. Uncert 3(1), 011004 (Jul 13, 2018) (13 pages) Paper No: VVUQ-17-1005; doi: 10.1115/1.4040585 History: Received February 17, 2017; Revised June 12, 2018

A validation/uncertainty quantification (VUQ) study was performed on the 1.5 MWth L1500 furnace, an oxy-coal fired facility located at the Industrial Combustion and Gasification Research Facility at the University of Utah. A six-step VUQ framework is used for studying the impact of model parameter uncertainty on heat flux, the quantity of interest (QOI) for the project. This paper focuses on the first two steps of the framework. The first step is the selection of model outputs in the experimental and simulation data that are related to the heat flux: incident heat flux, heat removal by cooling tubes, and wall temperatures. We describe the experimental facility, the operating conditions, and the data collection process. To obtain the simulation data, we utilized two tools, star-ccm+ and Arches. The star-ccm+ simulations captured flow through the complex geometry of the swirl burner while the Arches simulations captured multiphase reacting flow in the L1500. We employed a filtered handoff plane to couple the two simulations. In step two, we developed an input/uncertainty (I/U) map and assigned a priority to 11 model parameters based on prior knowledge. We included parameters from both a char oxidation model and an ash deposition model in this study. We reduced the active parameter space from 11 to 5 based on priority. To further reduce the number of parameters that must be considered in the remaining steps of the framework, we performed a sensitivity analysis on the five parameters and used the results to reduce the parameter set to two.

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Figures

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Fig. 1

Validation hierarchy for CCMSC

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Fig. 2

Six-step methodology with consistency analysis. Steps 1 and 2 are analyzed in this paper.

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Fig. 3

Drawing of the L1500 reactor located at the industrial combustion and gasification research facility: (a) schematic of the L1500 multifuel combustion furnace and (b) schematic of the first four sections of the L1500 furnace

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Fig. 4

L1500 cooling tubes: (a) Cooling tubes are located in the first four sections of the furnace; view is looking toward the furnace exit and (b) dimensions of a set of cooling tubes (in inches)

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Fig. 5

Schematic of the swirl burner used in the L1500 furnace. Inlets are labeled.

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Fig. 6

Swirl vanes in the burner at the 0% swirl and 100% swirl positions

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Fig. 7

Experimental PSD (from sieving and diffraction measurements) and fitted Rosin–Rammler PSD. Only the Beckman–Coulter diffraction data was used for the Rosin–Rammler fit.

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Fig. 8

Thermocouple placement in furnace wall. Section 4 is shown but the placement is similar for all thermocouple measurements.

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Fig. 9

L1500 simulation coupling between Arches and star-ccm+

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Fig. 10

Velocities (m/s) at plane of the burner tip; left are star-ccm+ results with a resolution of 0.5 × 10−3 m, right are Arches results with a resolution of 15 × 10−3 m (ratio = 30)

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Fig. 11

Shortened geometry for the L1500 simulations including the quarl, the eight sets of cooling tubes, and the step change in the reactor floor. Resolution is 15 mm.

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Fig. 12

Main sensitivity indices for radiative heat flux measured by the radiometers

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Fig. 13

Main sensitivity indices for the heat removed by the cooling tubes

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Fig. 14

Main sensitivity indices for wall temperature

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Fig. 15

Wall temperature at thermocouple locations computed with Arches. Horizontal red line is Tslag.

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