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

H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode
H2-rich syngas strategy to reduce NOx and CO emissions and improve stability limits under premixed swirl combustion mode
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 ? = 0.12–0.15.
Syngas, Lean blowout, NOx, Swirl, Emissions, CO2 diluent
0360-3199
19243-19255
Afzanizan Samiram, Nor
a15fc5c7-9374-40de-abdd-00bd1ab78433
Ng, Jo-Han
579e1556-0b23-4c17-9bc8-37f9a2f6bfc8
Nazri Mohd Jaafar, Mohammad
b1adfb52-d484-4da5-a615-d893dc8f1e40
Valera-Medina, Agustin
70389790-bf77-4d45-ae7e-0f848a057c13
Chong, Cheng Tung
94e5dbc6-2c37-4d23-b200-dd1080174deb
Afzanizan Samiram, Nor
a15fc5c7-9374-40de-abdd-00bd1ab78433
Ng, Jo-Han
579e1556-0b23-4c17-9bc8-37f9a2f6bfc8
Nazri Mohd Jaafar, Mohammad
b1adfb52-d484-4da5-a615-d893dc8f1e40
Valera-Medina, Agustin
70389790-bf77-4d45-ae7e-0f848a057c13
Chong, Cheng Tung
94e5dbc6-2c37-4d23-b200-dd1080174deb

Afzanizan Samiram, Nor, Ng, Jo-Han, Nazri Mohd Jaafar, Mohammad, Valera-Medina, Agustin and Chong, Cheng Tung (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), 19243-19255.

Record type: Article

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 ? = 0.12–0.15.

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More information

Accepted/In Press date: 15 August 2016
e-pub ahead of print date: 2 September 2016
Published date: 9 November 2016
Keywords: Syngas, Lean blowout, NOx, Swirl, Emissions, CO2 diluent
Organisations: Energy Technology Group, Engineering Science Unit, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 405740
URI: https://eprints.soton.ac.uk/id/eprint/405740
ISSN: 0360-3199
PURE UUID: 8b8f4477-0fa0-4d25-a059-b77193fe1284

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Date deposited: 18 Feb 2017 00:22
Last modified: 14 Mar 2019 06:11

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