Development and implementation of reduced chemistry for computional fluid dynamics modeling of selective non-catalytic reduction

Cremer, Marc; Montgomery, Christopher J.; Wang, D.H.; Heap, M.P.; Chen, Jyh-Yuan

doi:10.1016/s0082-0784(00)80656-6

Cited by 31 publications

(29 citation statements)

References 9 publications

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“…The reduced mechanism results are in reasonable agreement with the detailed mechanism results, which are in turn in reasonable agreement with the measurements. Previous experience 5 has shown that more species are required in the reduced mechanism to model ignition delay than to model perfectly stirred reactors (PSRs).…”

Section: Resultsmentioning

confidence: 99%

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Reduced chemical kinetic mechanisms for JP-8 combustion

Montgomery

Cannon²,

Mawid³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

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Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. ABSTRACTUsing CARM (Computer Aided Reduction Method), a computer program that automates the mechanism reduction process, six different reduced chemical kinetic mechanisms for JP-8 combustion have been generated. The reduced mechanisms have been compared to detailed chemistry calculations in simple homogeneous reactor calculations. Reduced mechanisms containing 15 and 20 species were found to give good agreement for both temperature and species concentrations (including NO) in adiabatic perfectly stirred reactor calculations for inlet temperatures from 300-1300 K, pressures from 10-40 atm, stoichiometric ratios from 0.5-2.0 and reactor residence times from 0.1 sec. to near blowout. Reduced mechanisms have also been created that compare well to available ignition delay measurements for JP-8.

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Section: Resultsmentioning

confidence: 99%

“…CARM has recently been applied to combustion of hydrocarbons such as ethylene and n-heptane 4 , NOx reduction in coal-fired furnaces 5 and incineration of hazardous chemicals 6 . In this work we apply CARM to a large detailed chemical kinetic mechanism for JP-8 combustion.…”

Section: Introductionmentioning

confidence: 99%

Reduced chemical kinetic mechanisms for JP-8 combustion

Montgomery

Cannon²,

Mawid³

et al. 2002

40th AIAA Aerospace Sciences Meeting &Amp; Exhibit

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“…The motivation for the majority of the simulations has been NOx reduction, including evaluation of the boiler impacts associated with combustion and post combustion based NOx controls. The application of these tools to the evaluation of NOx reduction strategies (Cremer, 2000a;Cremer, 2000b;Cremer, 2001a;Cremer 2001b;Cremer, 2002) and their impacts on coal fired boiler operation (Valentine, 2000;Davis 2002;Davis, 1998;Bakker, 1999) has been well documented.…”

Section: Task 23 Parametric Simulationsmentioning

confidence: 99%

Computational Fluid Dynamics Based Investigation of Sensitivity of Furnace Operational Conditions to Burner Flow Controls

Cremer¹,

Wang²,

Senior³

et al. 2005

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This is the Final Technical Report for DOE Cooperative Agreement No: DE-FC26-02NT41580. The goal of this project was to systematically assess the sensitivity of furnace operational conditions to burner air and fuel flows in coal fired utility boilers. The focus of this project was to quantify the potential impacts of "fine level" controls rather than that of "coarse level" controls (i.e. combustion tuning). Although it is well accepted that combustion tuning will generally improve efficiency and emissions of an "out of tune" boiler, it is not as well understood what benefits can be derived through active multiburner measurement and control systems in boiler that has coarse level controls.The approach used here was to utilize existing baseline furnace models that have been constructed using Reaction Engineering International's (REI) computational fluid dynamics (CFD) software. Using CFD analyses provides the ability to carry out a carefully controlled virtual experiment to characterize the sensitivity of NOx emissions, unburned carbon (UBC), furnace exit CO (FECO), furnace exit temperature (FEGT), and waterwall deposition to burner air and fuel flow rates. The Electric Power Research Institute (EPRI) provided co-funding for this program, and instrument and controls experts from EPRI's Instrument and Controls (I&C) Center have been active participants in this project.CFD simulations were completed for five coal fired boilers as planned: 1) 150 MW wall fired, 2) 500 MW opposed wall fired, 3) 600 MW T-Fired, 4) 330 MW cyclone-fired, and 5) 200 MW T-Fired Twin Furnace. In all cases, the unit selections were made in order to represent units that were descriptive of the utility industry as a whole. For each unit, between 25 and 44 furnace simulations were completed in order to evaluate impacts of burner to burner variations in: 1) coal and primary air flow rate, and 2) secondary air flow rate. The parametric matrices of cases that were completed were defined in order to accommodate sensitivity analyses of the results. The sensitivity analyses provide a strategy for quantifying the rate of change of NOx or unburned carbon in the fly ash to a rate of change in secondary air or fuel or stoichiometric ratio for individual burners or groups of burners in order to assess the value associated with individual burner flow control. In addition, the sensitivity coefficients that were produced provide a basis for quantifying the differences in sensitivities for the different boiler types. In a ranking of the sensitivity of NOx emissions to variations in secondary air flow between the burners at a fixed lower furnace stoichiometric ratio in order of least sensitive to most sensitive, the results were:

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Section: Task 23 Parametric Simulationsmentioning

confidence: 99%

Computational Fluid Dynamics Based Investigation of Sensitivity of Furnace Operational Conditions to Burner Flow Controls

Cremer¹,

Wang²,

Senior³

et al. 2004

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This is the extended second Semiannual Technical Report for DOE Cooperative Agreement No: DE-FC26-02NT41580. The goal of this project is to systematically assess the sensitivity of furnace operational conditions to burner air and fuel flows in coal fired utility boilers. Our approach is to utilize existing baseline furnace models that have been constructed using Reaction Engineering International's (REI) computational fluid dynamics (CFD) software. Using CFD analyses provides the ability to carry out a carefully controlled virtual experiment to characterize the sensitivity of NOx emissions, unburned carbon (UBC), furnace exit CO (FECO), furnace exit temperature (FEGT), and waterwall deposition to burner flow controls. The Electric Power Research Institute (EPRI) is providing co-funding for this program, and instrument and controls experts from EPRI's Instrument and Controls (I&C) Center are active participants in this project. This program contains multiple tasks and good progress is being made on all fronts.Highlights of the first year of the project include: During the next sixth month period, it is expected that the following work will be completed:• Additional parametric simulations involving primary air biasing in the 500 MW opposed fired unit will be completed.• Sensitivity coefficient analysis for the 500 MW opposed wall fired and the 600 MW tangentially fired units will be completed.• The parametric analysis for the "to be selected" cyclone fired unit will be completed.] The goal of this project is to systematically evaluate and quantify the sensitivity of furnace operational conditions to burner air and fuel flow controls in coal fired utility boilers. The approach is to utilize computational fluid dynamic (CFD) modeling to investigate the influence of variations of burner air and fuel flows under well controlled conditions on NOx emissions, unburned carbon, furnace exit CO, particulate deposition on waterwalls and boiler heat transfer characteristics in two wall-fired PC units (front and opposed wall-fired), two corner-fired PC units and one cyclone-fired unit. The lack of available information quantifying the benefit of expensive air and fuel flow controls on furnace performance is the motivating factor for this study.Existing CFD models that have been previously developed by REI are being utilized in this program so that the emphasis can be on parametric simulations. REI is working with researchers with EPRI's Instrumentation and Controls (I&C) Center to assure that meaningful parametric matrices are developed as well as to assure that the simulations that are completed will be meaningful for evaluation of the desired sensitivities.

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Development and implementation of reduced chemistry for computional fluid dynamics modeling of selective non-catalytic reduction

Cited by 31 publications

References 9 publications

Reduced chemical kinetic mechanisms for JP-8 combustion

Reduced chemical kinetic mechanisms for JP-8 combustion

Computational Fluid Dynamics Based Investigation of Sensitivity of Furnace Operational Conditions to Burner Flow Controls

Computational Fluid Dynamics Based Investigation of Sensitivity of Furnace Operational Conditions to Burner Flow Controls

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