The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams
This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Yuan, Ye [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014transfer abstract |
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| Schlagwörter: |
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| Umfang: |
11 |
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| Übergeordnetes Werk: |
Enthalten in: Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments - Lloyd, C.E.M. ELSEVIER, 2014, the journal of the Combustion Institute, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:161 ; year:2014 ; number:9 ; pages:2458-2468 ; extent:11 |
| Links: |
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| DOI / URN: |
10.1016/j.combustflame.2014.03.008 |
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ELV028418298 |
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| 520 | |a This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. | ||
| 520 | |a This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. | ||
| 650 | 7 | |a Ignition mode |2 Elsevier | |
| 650 | 7 | |a Pyrolysis |2 Elsevier | |
| 650 | 7 | |a Pulverized coal combustion |2 Elsevier | |
| 650 | 7 | |a Ignition delay |2 Elsevier | |
| 650 | 7 | |a Hencken burner |2 Elsevier | |
| 700 | 1 | |a Li, Shuiqing |4 oth | |
| 700 | 1 | |a Li, Gengda |4 oth | |
| 700 | 1 | |a Wu, Ning |4 oth | |
| 700 | 1 | |a Yao, Qiang |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Lloyd, C.E.M. ELSEVIER |t Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments |d 2014 |d the journal of the Combustion Institute |g Amsterdam [u.a.] |w (DE-627)ELV018057144 |
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10.1016/j.combustflame.2014.03.008 doi GBVA2014020000012.pica (DE-627)ELV028418298 (ELSEVIER)S0010-2180(14)00088-1 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Yuan, Ye verfasserin aut The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams 2014transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. Ignition mode Elsevier Pyrolysis Elsevier Pulverized coal combustion Elsevier Ignition delay Elsevier Hencken burner Elsevier Li, Shuiqing oth Li, Gengda oth Wu, Ning oth Yao, Qiang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:161 year:2014 number:9 pages:2458-2468 extent:11 https://doi.org/10.1016/j.combustflame.2014.03.008 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 161 2014 9 2458-2468 11 045F 620 |
| spelling |
10.1016/j.combustflame.2014.03.008 doi GBVA2014020000012.pica (DE-627)ELV028418298 (ELSEVIER)S0010-2180(14)00088-1 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Yuan, Ye verfasserin aut The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams 2014transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. Ignition mode Elsevier Pyrolysis Elsevier Pulverized coal combustion Elsevier Ignition delay Elsevier Hencken burner Elsevier Li, Shuiqing oth Li, Gengda oth Wu, Ning oth Yao, Qiang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:161 year:2014 number:9 pages:2458-2468 extent:11 https://doi.org/10.1016/j.combustflame.2014.03.008 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 161 2014 9 2458-2468 11 045F 620 |
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10.1016/j.combustflame.2014.03.008 doi GBVA2014020000012.pica (DE-627)ELV028418298 (ELSEVIER)S0010-2180(14)00088-1 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Yuan, Ye verfasserin aut The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams 2014transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. Ignition mode Elsevier Pyrolysis Elsevier Pulverized coal combustion Elsevier Ignition delay Elsevier Hencken burner Elsevier Li, Shuiqing oth Li, Gengda oth Wu, Ning oth Yao, Qiang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:161 year:2014 number:9 pages:2458-2468 extent:11 https://doi.org/10.1016/j.combustflame.2014.03.008 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 161 2014 9 2458-2468 11 045F 620 |
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10.1016/j.combustflame.2014.03.008 doi GBVA2014020000012.pica (DE-627)ELV028418298 (ELSEVIER)S0010-2180(14)00088-1 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Yuan, Ye verfasserin aut The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams 2014transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. Ignition mode Elsevier Pyrolysis Elsevier Pulverized coal combustion Elsevier Ignition delay Elsevier Hencken burner Elsevier Li, Shuiqing oth Li, Gengda oth Wu, Ning oth Yao, Qiang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:161 year:2014 number:9 pages:2458-2468 extent:11 https://doi.org/10.1016/j.combustflame.2014.03.008 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 161 2014 9 2458-2468 11 045F 620 |
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10.1016/j.combustflame.2014.03.008 doi GBVA2014020000012.pica (DE-627)ELV028418298 (ELSEVIER)S0010-2180(14)00088-1 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Yuan, Ye verfasserin aut The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams 2014transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. Ignition mode Elsevier Pyrolysis Elsevier Pulverized coal combustion Elsevier Ignition delay Elsevier Hencken burner Elsevier Li, Shuiqing oth Li, Gengda oth Wu, Ning oth Yao, Qiang oth Enthalten in Elsevier Science Lloyd, C.E.M. ELSEVIER Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments 2014 the journal of the Combustion Institute Amsterdam [u.a.] (DE-627)ELV018057144 volume:161 year:2014 number:9 pages:2458-2468 extent:11 https://doi.org/10.1016/j.combustflame.2014.03.008 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA SSG-OPC-GGO GBV_ILN_70 74.00 Geographie Anthropogeographie: Allgemeines VZ 44.73 Geomedizin VZ AR 161 2014 9 2458-2468 11 045F 620 |
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The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams |
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This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. |
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This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. |
| abstract_unstemmed |
This work is assessing a study of the collective ignition behaviors of dispersed coal particle streams, with ambience temperature from 1200K to 1800K and oxygen mole fractions in the range of 10–30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner by a novel de-agglomeration feeder. Three kinds of pulverized coals from different ranks, Hulunbel lignite, high-ash-fusion bituminous and low-ash-fusion bituminous, are considered. The normalized visible light signal intensity, deleting the background noise, is established to characterize the ignition delay of coal particle streams. Firstly, the prevalent transition from heterogeneous ignition to hetero–homogeneous ignition due to ambience temperature is observed. The pure homogeneous ignition rarely occurs, with an exception under high temperature and low oxygen for high-volatile coal. By comparing time scales between pyrolysis and heating processes, the competition of the volatile evolution and heterogeneous surface reaction are discussed. Then, the effects of ambience temperature, oxygen mole fraction and coal rank on the characteristic ignition delay are examined. Finally, the transient mode is developed, which not only well interprets the observed ignition transition phenomena, but also approximately predicts a variation of heterogeneous ignition time as a function of oxygen fraction. |
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The transition of heterogeneous–homogeneous ignitions of dispersed coal particle streams |
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