Numerical Investigation of High Pressure CO2-Diluted Combustion Using a Flamelet-based Approach. Issue 11 (1st November 2020)

• Record Type: Journal Article
• Authors: Indelicato, Giuseppe; Lapenna, Pasquale Eduardo; Concetti, Riccardo; Caputo, Maddalena; Valorani, Mauro; Magnotti, Gaetano; Creta, Francesco
• Is Part Of: Combustion science and technology. Volume 192:Issue 11(2020)
• Page Start: 2028
• Page End: 2049
• Publication Date: 2020-11-01
• Subjects: Supercritical combustion -- oxy-fuel combustion -- Allam cycle -- supercritical CO2 -- turbulent combustion; Combustion -- Periodicals; Combustion engineering -- Periodicals; 541.36105
• DOI: 10.1080/00102202.2020.1811243
• Languages: English
• ISSNs: 0010-2202

Abstract

ABSTRACT: Direct-fired oxy-fuel combustion as a heat source is utilized in supercritical carbon dioxide (sCO2 ) power cycles, such as the Allam cycle, which has shown promise in delivering higher efficiencies while achieving the complete capture of combustion products in future generation carbon-neutral power plants. The design of dedicated burners for such cycles is key in determining their overall efficiency and viability. We present a series of numerical simulations on a prototype burner, currently in development, operating in an essentially non-premixed regime with a high pressure gaseous fuel, burning in the presence of a hot oxidant flow containing a mixture of recycled CO2 and pure oxygen. Simulations rely on a turbulent combustion model based on a simplified approach for diluted steady laminar flamelets. We investigate the effect of the degree of dilution as well as pressure on the flame structure, revealing a concurrent change in stoichiometric mixture fraction and quenching scalar dissipation. We also assess the effect of injector recess and of swirl in the oxidizer stream.