Coal and biomass char reactivities in gasification and combustion environments
Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to rea...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Tilghman, Matthew B. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015transfer abstract |
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| Schlagwörter: |
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| Umfang: |
16 |
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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:162 ; year:2015 ; number:9 ; pages:3220-3235 ; extent:16 |
| Links: |
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| DOI / URN: |
10.1016/j.combustflame.2015.05.009 |
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ELV029286530 |
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| 520 | |a Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. | ||
| 520 | |a Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. | ||
| 650 | 7 | |a Intrinsic reactivity |2 Elsevier | |
| 650 | 7 | |a Char |2 Elsevier | |
| 650 | 7 | |a Coal |2 Elsevier | |
| 650 | 7 | |a Gasification |2 Elsevier | |
| 650 | 7 | |a Combustion |2 Elsevier | |
| 650 | 7 | |a Biomass |2 Elsevier | |
| 700 | 1 | |a Mitchell, Reginald E. |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.2015.05.009 doi GBV00000000000161A.pica (DE-627)ELV029286530 (ELSEVIER)S0010-2180(15)00147-9 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Tilghman, Matthew B. verfasserin aut Coal and biomass char reactivities in gasification and combustion environments 2015transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Intrinsic reactivity Elsevier Char Elsevier Coal Elsevier Gasification Elsevier Combustion Elsevier Biomass Elsevier Mitchell, Reginald E. 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:162 year:2015 number:9 pages:3220-3235 extent:16 https://doi.org/10.1016/j.combustflame.2015.05.009 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 162 2015 9 3220-3235 16 045F 620 |
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10.1016/j.combustflame.2015.05.009 doi GBV00000000000161A.pica (DE-627)ELV029286530 (ELSEVIER)S0010-2180(15)00147-9 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Tilghman, Matthew B. verfasserin aut Coal and biomass char reactivities in gasification and combustion environments 2015transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Intrinsic reactivity Elsevier Char Elsevier Coal Elsevier Gasification Elsevier Combustion Elsevier Biomass Elsevier Mitchell, Reginald E. 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:162 year:2015 number:9 pages:3220-3235 extent:16 https://doi.org/10.1016/j.combustflame.2015.05.009 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 162 2015 9 3220-3235 16 045F 620 |
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10.1016/j.combustflame.2015.05.009 doi GBV00000000000161A.pica (DE-627)ELV029286530 (ELSEVIER)S0010-2180(15)00147-9 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Tilghman, Matthew B. verfasserin aut Coal and biomass char reactivities in gasification and combustion environments 2015transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Intrinsic reactivity Elsevier Char Elsevier Coal Elsevier Gasification Elsevier Combustion Elsevier Biomass Elsevier Mitchell, Reginald E. 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:162 year:2015 number:9 pages:3220-3235 extent:16 https://doi.org/10.1016/j.combustflame.2015.05.009 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 162 2015 9 3220-3235 16 045F 620 |
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10.1016/j.combustflame.2015.05.009 doi GBV00000000000161A.pica (DE-627)ELV029286530 (ELSEVIER)S0010-2180(15)00147-9 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Tilghman, Matthew B. verfasserin aut Coal and biomass char reactivities in gasification and combustion environments 2015transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Intrinsic reactivity Elsevier Char Elsevier Coal Elsevier Gasification Elsevier Combustion Elsevier Biomass Elsevier Mitchell, Reginald E. 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:162 year:2015 number:9 pages:3220-3235 extent:16 https://doi.org/10.1016/j.combustflame.2015.05.009 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 162 2015 9 3220-3235 16 045F 620 |
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10.1016/j.combustflame.2015.05.009 doi GBV00000000000161A.pica (DE-627)ELV029286530 (ELSEVIER)S0010-2180(15)00147-9 DE-627 ger DE-627 rakwb eng 620 620 DE-600 690 VZ 610 VZ 74.00 bkl 44.73 bkl Tilghman, Matthew B. verfasserin aut Coal and biomass char reactivities in gasification and combustion environments 2015transfer abstract 16 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. Intrinsic reactivity Elsevier Char Elsevier Coal Elsevier Gasification Elsevier Combustion Elsevier Biomass Elsevier Mitchell, Reginald E. 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:162 year:2015 number:9 pages:3220-3235 extent:16 https://doi.org/10.1016/j.combustflame.2015.05.009 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 162 2015 9 3220-3235 16 045F 620 |
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Enthalten in Methods for detecting change in hydrochemical time series in response to targeted pollutant mitigation in river catchments Amsterdam [u.a.] volume:162 year:2015 number:9 pages:3220-3235 extent:16 |
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coal and biomass char reactivities in gasification and combustion environments |
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Coal and biomass char reactivities in gasification and combustion environments |
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Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. |
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Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. |
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Mass loss data obtained in gasification and combustion tests in a thermogravimetric analyzer were used to adjust parameters in an intrinsic chemical reactivity model developed to predict char conversion rates and off-gas compositions when pulverized coal and biomass char particles are exposed to reactive gases. Char reactivity tests were performed in H2O/H2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to H2O, in CO2/CO/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to CO2, and in O2/N2 environments in order to obtain data to determine kinetic parameters for char intrinsic reactivity to O2. Wyodak coal and corn stover chars produced at high heating rates were used in the reactivity tests, which were performed under kinetics-controlled conditions. Values determined for the heats of formation and absolute entropies of species adsorbed onto the carbonaceous surfaces as well as the values determined for activation energies of reaction rate coefficients are in the expected ranges for the type reaction considered. The reaction mechanism correctly describes the impact of temperature, H2O, CO2 and O2 mole fractions, and total pressure on the conversion rates of coal and biomass chars and it captures the inhibiting effects of H2 and CO on char reactivities to H2O and CO2 over the ranges of temperature, pressure and gas composition relevant to coal and biomass gasifiers and combustors. The heterogeneous reaction mechanism developed accurately predicts the effects of heterogeneous reaction in gasification and combustion environments, including oxy-combustion environments. |
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