H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode

Samiran, N. A. and Ng, Jo-Han and Mohd Jaafar, Mohammad Nazri and ValeraMedina, Agustin and Tung, Chong Cheng (2016) H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode. International Journal of Hydrogen Energy, 41 (42). pp. 19243-19255. ISSN 0360-3199

Text AJ 2018 (820) H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode.pdf Restricted to Registered users only Download (4MB) | Request a copy

Abstract

The combustion performance of H2-rich model syngas was investigated by using a premixed swirl flame combustor. Syngas consisting mainly of H2 and CO was blended with components such as CH4 and CO2 in a mixing chamber prior to combustion at atmospheric condition. The global flame appearance and emissions performance were examined for high (H2/CO = 3) and moderate (H2/CO = 1.2) H2-rich syngases. Results showed that higher H2 fractions in the syngases produce lower NOx emissions per kWh basis across all equivalence ratios tested. CO emissions are equivalence ratio dependent and are less affected by the H2 fraction in the syngas. Increasing CO2 diluent ratios result in the decrease of NOx, particularly for moderate H2-rich syngases. In contrast, syngas without CO shows an increase of NOx with increasing CO2 for fuel-lean mixtures. Addition of CO2 increases the lean blowout limit of all syngases. Higher fraction of H2 produces lower lean blowout limits due to the characteristics of high diffusivity of hydrogen molecules and high flame speed that assist in the stabilisation of the flame under flame-lean conditions. The range of blowout limits for moderate and high H2-rich and pure hydrogen syngases under diluent ratios up to 25% were within the range of ϕ = 0.12–0.15.

Item Type:	Article
Uncontrolled Keywords:	Blowouts; Carbon dioxide; Combustion; Combustors; Particulate emissions; Synthesis gas; Atmospheric conditions; Combustion performance; Emissions performance; High diffusivities; Lean blow out; Lean-blowout limits; Swirl; Syn-gas; Flame research
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ751-805 Miscellaneous motors and engines Including gas, gasoline, diesel engines
Divisions:	Faculty of Engineering Technology > Department of Mechnical Engineering Technology
Depositing User:	UiTM Student Praktikal
Date Deposited:	04 Jan 2022 02:45
Last Modified:	04 Jan 2022 02:45
URI:	http://eprints.uthm.edu.my/id/eprint/5031

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