# Numerical evaluation of a novel double-concentric swirl burner for sulfur combustion

Zhang, F.; Heidarifatasmi, H.; Harth, S.; Zirwes, T.; Wang, R.; Fedoryk, M.; Sebbar, N.; Habisreuther, P.; Trimis, D.; Bockhorn, H.

##### Abstract:
A burner system for the efficient and clean combustion of sulfur is introduced, which serves as a key component in a novel solar power cycle using sulfur as chemical storage medium of solar energy. In order to validate the proposed design concept, highly-resolved numerical simulations have been performed. The current setup is operated with a thermal load of 20 kW or power density of 5 MW/m$^{3}$. Two nozzle configurations with different swirl intensities (SI) of the airflow are studied. A large inner recirculation zone is observed for the nozzle with a high SI (HSI), which leads to a strong radial dispersion of the sulfur spray and a broad, short flame in the combustion chamber; although this HSI design is beneficial from the viewpoint of flame stabilization, it causes a large number of sulfur droplets hitting the chamber wall. In contrast, the nozzle design with a low SI (LSI) yields a narrow spray and a long jet flame, with much less droplets hitting the wall. The HSI nozzle shows an overall higher flame temperature compared with the LSI nozzle, which is confirmed to be caused by burning at a higher local fuel equivalence ratio. This is attributed to the strong inner recirculation flow generated by the high swirl intensity, which results in an enhanced evaporation and mixing of sulfur droplets with air. ... mehr

 Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)Steinbuch Centre for Computing (SCC) Publikationstyp Zeitschriftenaufsatz Publikationsmonat/-jahr 11.2020 Sprache Englisch Identifikator ISSN: 1364-0321, 1879-0690 KITopen-ID: 1000124094 Erschienen in Renewable & sustainable energy reviews Band 133 Seiten Art. Nr.: 110257 Schlagwörter Solar power cycle sulfur combustion spray,combustion Euler-Lagrangian simulation, OpenFOAM Nachgewiesen in Scopus
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