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Combustion and emission performances of coconut, palm and soybean methyl esters under reacting spray flame conditions

Combustion and emission performances of coconut, palm and soybean methyl esters under reacting spray flame conditions
Combustion and emission performances of coconut, palm and soybean methyl esters under reacting spray flame conditions

The spray combustion characteristics of coconut (CME), palm (PME) and soybean (SME) biodiesels/methyl esters were compared with diesel by using an axial swirl flame burner. Atomisation of the liquid fuels was achieved via an airblast-type nozzle with varied atomising air-to-liquid ratios (ALR) of 2–2.5. The fully developed sprays were mixed with strongly swirled air to form combustible mixtures prior to igniting at the burner outlet. Under fuel-lean condition, biodiesel spray flames exhibited bluish flame core without the yellowish sooty flame brush, indicating low sooting tendency as compared to baseline diesel. Increasing the atomising air led to the reduction of flame length but increase in flame intensity. Measurements of post-combustion emissions show that SME produced higher NO as compared to CME and PME due to higher degree of unsaturation, while the most saturated CME showed the lowest NO and CO emissions amongst the biodiesels tested across all equivalence ratios. By preheating the main swirl air to 250 °C, higher emissions of NO, CO and CO2 were observed for biodiesels. Higher ALR led to reduced NO and CO emissions regardless of the fuel used, making it a viable strategy to resolve the simultaneous NO–CO reduction conundrum. This work shows that despite different emission characteristics exhibited by biodiesels produced from different feedstock, they are in principle potential supplemental fuels for practical combustion systems. The pollutants emitted can be mitigated by operating at higher ALR in a twin-fluid based swirl combustor.

Biodiesel, Coconut, Palm, Soy, Spray flame
1743-9671
Chiong, Meng Choung
f6e7653c-17fa-4f7c-95e8-e4b46add0cf1
Chong, Cheng Tung
94e5dbc6-2c37-4d23-b200-dd1080174deb
Ng, Jo Han
4c9c51bd-1cfc-46c0-b519-23b77566fe50
Tran, Manh Vu
0a5a5a74-9c01-47bd-8f71-19da7460246e
Lam, Su Shiung
6b37a05e-d996-499c-8847-06a8fea295a7
Valera-Medina, Agustin
70389790-bf77-4d45-ae7e-0f848a057c13
Mohd Jaafar, Mohammad Nazri
06cca709-1f75-4ded-b2bb-94e90114c594
Chiong, Meng Choung
f6e7653c-17fa-4f7c-95e8-e4b46add0cf1
Chong, Cheng Tung
94e5dbc6-2c37-4d23-b200-dd1080174deb
Ng, Jo Han
4c9c51bd-1cfc-46c0-b519-23b77566fe50
Tran, Manh Vu
0a5a5a74-9c01-47bd-8f71-19da7460246e
Lam, Su Shiung
6b37a05e-d996-499c-8847-06a8fea295a7
Valera-Medina, Agustin
70389790-bf77-4d45-ae7e-0f848a057c13
Mohd Jaafar, Mohammad Nazri
06cca709-1f75-4ded-b2bb-94e90114c594

Chiong, Meng Choung, Chong, Cheng Tung, Ng, Jo Han, Tran, Manh Vu, Lam, Su Shiung, Valera-Medina, Agustin and Mohd Jaafar, Mohammad Nazri (2018) Combustion and emission performances of coconut, palm and soybean methyl esters under reacting spray flame conditions. Journal of the Energy Institute. (doi:10.1016/j.joei.2018.07.003).

Record type: Article

Abstract

The spray combustion characteristics of coconut (CME), palm (PME) and soybean (SME) biodiesels/methyl esters were compared with diesel by using an axial swirl flame burner. Atomisation of the liquid fuels was achieved via an airblast-type nozzle with varied atomising air-to-liquid ratios (ALR) of 2–2.5. The fully developed sprays were mixed with strongly swirled air to form combustible mixtures prior to igniting at the burner outlet. Under fuel-lean condition, biodiesel spray flames exhibited bluish flame core without the yellowish sooty flame brush, indicating low sooting tendency as compared to baseline diesel. Increasing the atomising air led to the reduction of flame length but increase in flame intensity. Measurements of post-combustion emissions show that SME produced higher NO as compared to CME and PME due to higher degree of unsaturation, while the most saturated CME showed the lowest NO and CO emissions amongst the biodiesels tested across all equivalence ratios. By preheating the main swirl air to 250 °C, higher emissions of NO, CO and CO2 were observed for biodiesels. Higher ALR led to reduced NO and CO emissions regardless of the fuel used, making it a viable strategy to resolve the simultaneous NO–CO reduction conundrum. This work shows that despite different emission characteristics exhibited by biodiesels produced from different feedstock, they are in principle potential supplemental fuels for practical combustion systems. The pollutants emitted can be mitigated by operating at higher ALR in a twin-fluid based swirl combustor.

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More information

Accepted/In Press date: 16 July 2018
e-pub ahead of print date: 20 July 2018
Keywords: Biodiesel, Coconut, Palm, Soy, Spray flame

Identifiers

Local EPrints ID: 425595
URI: http://eprints.soton.ac.uk/id/eprint/425595
ISSN: 1743-9671
PURE UUID: d7982dc5-d900-4ca4-b153-539be4a5c6b7

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Date deposited: 25 Oct 2018 16:30
Last modified: 23 Jan 2020 17:33

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Contributors

Author: Meng Choung Chiong
Author: Cheng Tung Chong
Author: Jo Han Ng
Author: Manh Vu Tran
Author: Su Shiung Lam
Author: Agustin Valera-Medina
Author: Mohammad Nazri Mohd Jaafar

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