A Strategy Of Reactant Mixing In Methane Direct-Fired Sco2 Combustors

Abstract

The sCO2 power cycle concept is identified as apotentially efficient, economical, and pollutant free powergeneration technique for future power generation. Recentwork in the literature provides some strategies and bestoperating conditions for direct-fired sCO2 combustors basedon zero-dimensional reactor modeling analysis, however thereis a need for a detailed investigation using accuratecombustion chemical kinetics and thermophysical models.Here, the sCO2 combustor is modelled by coupling perfectlystirred reactor (PSR) and plug flow reactor (PFR) models. Thereal gas effects are incorporated using the Soave-RedlichKwong (SRK) equation of state. Also, the detailed Aramco 2.0kinetic mechanism is used for the combustion kinetic rates.It is found that the primary zone must be diluted eitherwith thirty or forty-five percent of the total CO2 in the cycleto have a feasible combustor design. However, the forty-fivepercent dilution level at 950 K and 1000 K yielded a betterconsumption of CO, O2 and CH4. Also, the cross-sectionalarea of the sCO2 combustor can be scaled-down to 10 to 20times smaller than a traditional combustor with the samepower output. Further, from this investigation, it is alsorecommended to have a gradually increasing secondarydilution in the dilution zone, by using progressively largerdiameter holes. This design would help retain relatively hightemperature in the initial portion of the dilution zone andwould help consume fuel species such as, CO and CH4.

Publication Date

1-1-2018

Publication Title

Proceedings of the ASME Turbo Expo

Volume

9

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/GT2018-75547

Socpus ID

85053882854 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85053882854

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