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Special Section on 2018 Clean Energy

Oxy-Combustion Modeling for Direct-Fired Supercritical CO2 Power Cycles

[+] Author and Article Information
Peter A. Strakey

National Energy Technology Laboratory,
3610 Collins Ferry Road,
PO Box 880,
Morgantown, WV 26507
e-mail: peter.strakey@netl.doe.gov

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 20, 2018; final manuscript received February 7, 2019; published online March 29, 2019. Assoc. Editor: Ashwani K. Gupta. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Energy Resour. Technol 141(7), 070706 (Mar 29, 2019) (8 pages) Paper No: JERT-18-1449; doi: 10.1115/1.4043124 History: Received June 20, 2018; Revised February 07, 2019

Supercritical CO2 power cycles for fossil energy power generation will likely employ oxy-combustion at very high pressures, possibly exceeding 300 bar. At these high pressures, a direct fired oxy-combustor is more likely to behave like a rocket engine than any type of conventional gas turbine combustor. Issues such as injector design, wall heat transfer, and combustion dynamics may play a challenging role in combustor design. Computational fluid dynamics modeling will not only be useful, but may be a necessity in the combustor design process. To accurately model turbulent reacting flows, combustion submodels appropriate for the conditions of interest as defined by the turbulent time and length scales as well as chemical kinetic time scales are necessary. This paper presents a comparison of various turbulence–chemistry interaction (TCI) modeling approaches on a canonical, single injector, direct-fired sCO2 combustor. Large eddy simulation is used to model the turbulent combustion process with varying levels of injector oxygen concentration while comparing the effect of the combustion submodel on CO emissions and flame shape. While experimental data are not yet available to validate the simulations, the sensitivity of CO production and flame shape can be studied as a function of combustion modeling approach and oxygen concentration in an effort to better understand how to approach combustion modeling at these unique conditions.

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Figures

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Fig. 1

Computational domain for the single injector oxy-combustor

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Fig. 2

Borghi combustion diagram showing combustion regime of the three test cases along with typical operating range for IC engines and gas turbines [9]

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Fig. 3

Instantaneous temperature contours through center of combustor for all three cases with laminar model

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Fig. 4

Contour plots of mean heat release rate (W/m3) for all three cases with laminar model. Linear scale (left) and log scale (right).

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Fig. 5

Instantaneous snapshots of temperature (top row) for all three models for O2 mass fraction of 25%. Mean temperature contours (second row), mean OH contours (third row), and mean CO contours (bottom row).

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Fig. 6

Instantaneous snapshots of temperature (top row) for all three models for O2 mass fraction of 14%. Mean temperature contours (second row), mean OH contours (third row), and mean CO contours (bottom row).

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Fig. 7

Histograms of mean combustor CO mass fraction emissions for all three models along with calculated equilibrium values. All three test cases presented with decreasing injector O2 concentration from left to right.

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Fig. 8

Path flux analysis for 300 bar methane oxidation with 16-species mechanism

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Fig. 9

Centerline profiles of mean O2 and CO concentration for laminar and FDF models for case 2 (left). Centerline profiles of mean CH4, CH3, and HCO for laminar and FDF models for case 2 (right).

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Fig. 10

Centerline profiles of mean CO formation and destruction rates along with CO net rate for case 2

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Fig. 11

Instantaneous distributions of normalized mixture fraction probability for laminar and FDF models for case 2 for temperatures greater than 1700 K

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Fig. 12

Scatter plots of instantaneous temperature versus mixture fraction in postflame region for laminar and FDF models (left) along with equilibrium values (blue lines), and for laminar and flamelet models (right) for case 2

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Fig. 13

Instantaneous snapshots of temperature (top row) for all three models for O2 mass fraction of 7%. Mean temperature contours (second row), mean OH contours (third row), and mean CO contours (bottom row).

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Fig. 14

Computational time in seconds per time-step on 128 cores for all three models

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