Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure
Steam-diluted combustion in gas turbine systems is an effective approach to control pollutant emissions and improve the gas turbine efficiency. The primary purpose of the present research is to analyze the influence of steam dilution on the combustion stability, flame structures, and CO emissions of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/10/7/1070 |
| _version_ | 1811308155700772864 |
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| author | Mao Li Yiheng Tong Marcus Thern Jens Klingmann |
| author_facet | Mao Li Yiheng Tong Marcus Thern Jens Klingmann |
| author_sort | Mao Li |
| collection | DOAJ |
| description | Steam-diluted combustion in gas turbine systems is an effective approach to control pollutant emissions and improve the gas turbine efficiency. The primary purpose of the present research is to analyze the influence of steam dilution on the combustion stability, flame structures, and CO emissions of a swirl-stabilized gas turbine model combustor under atmospheric pressure conditions. The premixed methane/air/steam flame was investigated with three preheating temperatures (384 K/434 K/484 K) and the equivalence ratio was varied from stoichiometric conditions to the flammability limits where the flame was physically blown out from the combustor. In order to represent the steam dilution intensity, the steam fraction Ω defined as the steam to air mass flow rate ratio was used in this work. Exhaust gases were sampled with a water-cooled emission probe which was mounted at the combustor exit. A 120 mm length quartz liner was used which enabled the flame visualization and optical measurement. Time-averaged CH chemiluminescence imaging was conducted to characterize the flame location and it was further analyzed with the inverse Abel transform method. Chemical kinetics calculation was conducted to support and analyze the experimental results. It was found that the LBO (lean blowout) limits were increased with steam fraction. CH chemiluminescence imaging showed that with a high steam fraction, the flame length was elongated, but the flame structure was not altered. CO emissions were mapped as a function of the steam fraction, inlet air temperature, and equivalence ratios. Stable combustion with low CO emission can be achieved with an appropriate steam fraction operation range. |
| first_indexed | 2024-04-13T09:18:06Z |
| format | Article |
| id | doaj.art-b325d129c9ae44aba469dd2cddec2a06 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T09:18:06Z |
| publishDate | 2017-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-b325d129c9ae44aba469dd2cddec2a062022-12-22T02:52:42ZengMDPI AGEnergies1996-10732017-07-01107107010.3390/en10071070en10071070Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric PressureMao Li0Yiheng Tong1Marcus Thern2Jens Klingmann3Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, SwedenDepartment of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, SwedenDepartment of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, SwedenDepartment of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, SwedenSteam-diluted combustion in gas turbine systems is an effective approach to control pollutant emissions and improve the gas turbine efficiency. The primary purpose of the present research is to analyze the influence of steam dilution on the combustion stability, flame structures, and CO emissions of a swirl-stabilized gas turbine model combustor under atmospheric pressure conditions. The premixed methane/air/steam flame was investigated with three preheating temperatures (384 K/434 K/484 K) and the equivalence ratio was varied from stoichiometric conditions to the flammability limits where the flame was physically blown out from the combustor. In order to represent the steam dilution intensity, the steam fraction Ω defined as the steam to air mass flow rate ratio was used in this work. Exhaust gases were sampled with a water-cooled emission probe which was mounted at the combustor exit. A 120 mm length quartz liner was used which enabled the flame visualization and optical measurement. Time-averaged CH chemiluminescence imaging was conducted to characterize the flame location and it was further analyzed with the inverse Abel transform method. Chemical kinetics calculation was conducted to support and analyze the experimental results. It was found that the LBO (lean blowout) limits were increased with steam fraction. CH chemiluminescence imaging showed that with a high steam fraction, the flame length was elongated, but the flame structure was not altered. CO emissions were mapped as a function of the steam fraction, inlet air temperature, and equivalence ratios. Stable combustion with low CO emission can be achieved with an appropriate steam fraction operation range.https://www.mdpi.com/1996-1073/10/7/1070steam dilutionhumidified combustionlean blowoutCO emissionpremixed combustion |
| spellingShingle | Mao Li Yiheng Tong Marcus Thern Jens Klingmann Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure Energies steam dilution humidified combustion lean blowout CO emission premixed combustion |
| title | Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure |
| title_full | Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure |
| title_fullStr | Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure |
| title_full_unstemmed | Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure |
| title_short | Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure |
| title_sort | influence of the steam addition on premixed methane air combustion at atmospheric pressure |
| topic | steam dilution humidified combustion lean blowout CO emission premixed combustion |
| url | https://www.mdpi.com/1996-1073/10/7/1070 |
| work_keys_str_mv | AT maoli influenceofthesteamadditiononpremixedmethaneaircombustionatatmosphericpressure AT yihengtong influenceofthesteamadditiononpremixedmethaneaircombustionatatmosphericpressure AT marcusthern influenceofthesteamadditiononpremixedmethaneaircombustionatatmosphericpressure AT jensklingmann influenceofthesteamadditiononpremixedmethaneaircombustionatatmosphericpressure |