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    Experimental study and kinetic analysis of the laminar burning velocity of NH3/syngas/air, NH3/CO/air and NH3/H2/air premixed flames at elevated pressures

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    Name:
    NH3-paper V12.pdf
    Size:
    3.544Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2022-08-04
    Download
    Type
    Article
    Authors
    Wang, Shixing
    Wang, Zhihua
    Elbaz, Ayman M.
    Han, Xinlu cc
    He, Yong
    Costa, Mário
    Konnov, Alexander A.
    Roberts, William L. cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    dClean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
    high-pressure combustion (HPC) Research Group
    Date
    2020-08-19
    Online Publication Date
    2020-08-19
    Print Publication Date
    2020-11
    Embargo End Date
    2022-08-04
    Submitted Date
    2020-04-14
    Permanent link to this record
    http://hdl.handle.net/10754/664942
    
    Metadata
    Show full item record
    Abstract
    Mixing ammonia with syngas can be a promising way to overcome the low reactivity of ammonia, allowing it to find usage in IGCC (Integrated Gasification Combined Cycle) systems and gas turbines for power generation. However, fundamental experimental data on laminar burning velocity of NH3/syngas/air are rather scarce, especially at elevated pressures. This information is critical for the development and validation of reaction mechanisms and advances in combustor design. In the present work, measurements of the laminar burning velocities (SL) of NH3/syngas/air, NH3/CO/air, and NH3/H2/air premixed flames were performed by the heat flux method at pressures up to 5 atm, equivalence ratios ranging from 0.7 to 1.6, ammonia mole fractions in the fuel mixture from 0.2 to 1.0 in the NH3/syngas/air mixtures and 0.03–1.0 in the NH3/CO/air mixtures. Several recently published ammonia oxidation mechanisms were tested against the present experimental data. The measurements and predictions of SL exhibit discrepancies especially for NH3/H2/air flames at elevated pressures. The pressure exponent factors, β, characterizing burning velocity at elevated pressure via empirical power-law correlation SL/SL0 = (P/P0)β are extracted from the measured SL and compared with the numerical results. The thermal, diffusion, and chemical effects of blending syngas with ammonia on SL of the mixtures are distinguished, and the dominant role of the adiabatic flame temperature on the variation of the pressure exponent β is discussed. Kinetic modeling and sensitivity analyses showed that reactions of NHi to N2Hi (i = 0–4) species affect the predicted SL under rich conditions. At elevated pressures, these reactions also affect the NO formation via third-body collision reactions and NHi + NO reactions. Even for rich flames, the ammonia consumption is favored with the addition of syngas which also promotes NO formation by enriching the H and OH radical pools and increasing the flame temperature. The addition of hydrogen or carbon monoxide has equally promoting effect on the ammonia decomposition and NOx formation although their flame speed differs a lot.
    Citation
    Wang, S., Wang, Z., Elbaz, A. M., Han, X., He, Y., Costa, M., … Roberts, W. L. (2020). Experimental study and kinetic analysis of the laminar burning velocity of NH3/syngas/air, NH3/CO/air and NH3/H2/air premixed flames at elevated pressures. Combustion and Flame, 221. doi:10.1016/j.combustflame.2020.08.004
    Sponsors
    This work was supported by the Fundamental Research Funds for the Central Universities (2020FZZX003-01-01) the State Key Laboratory of Clean Energy Utilization (ZJUCEU2019001), and King Abdullah University of Science and Technolgy. M. Costa acknowledges the support from the Fundação para a Ciência e a Tecnologia, through IDMEC, under LAETA, project UID/EMS/50022/2019.
    Publisher
    Elsevier BV
    Journal
    Combustion and Flame
    DOI
    10.1016/j.combustflame.2020.08.004
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0010218020303199
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.combustflame.2020.08.004
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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