Abstract
This paper presents a thermochemical and experimental investigation into the use of oxy-fuel exhaust gases for the tri-reforming of light oil. The thermochemical recuperation of light oil makes it possible for the furnace to burn hydrogen-rich syngas, and thereby significantly improve furnace efficiency. This study investigates three process parameters: the exhaust gas recirculation rate, the syngas temperature, and the exhaust gas temperature. (1) The more exhaust gas that is recirculated, the less oxygen is required for complete conversion into syngas, and the higher the heating value of the produced syngas. A maximum increase in the heating value of 31.6% (compared to the primary fuel) is possible if pure bi-reforming is performed. (2) The chemical equilibrium calculations showed that the syngas temperature has a strong effect on the composition of the syngas; a syngas temperature of 1265 °C is necessary to achieve a conversion rate of 99.9%. The thermodynamic analysis was performed using the Gibbs free energy minimization method. In order to prevent carbon formation, a slight oxygen excess of 1% must be present. In this case, a syngas temperature of 970 °C is sufficient for the stationary tri-reforming of light oil. (3) The energy required for reforming the primary fuel increases with increased syngas temperature, while the energy contained in the hot exhaust gas stream increases with increased exhaust gas temperature. In order to achieve a syngas temperature of at least 970 °C, both the required exhaust gas recirculation rate and the amount of oxygen for reforming and combustion are directly dependent on the temperature of the exhaust gas. An exhaust gas temperature of 1000 °C requires an exhaust gas recirculation rate of 16.2%, while a recirculation rate of 26.9% is necessary at an exhaust gas temperature of 1600 °C. In the latter case, it is possible to increase the efficiency of the oxy-fuel furnace by 22.8%.
| Original language | English |
|---|---|
| Pages (from-to) | 302-312 |
| Number of pages | 11 |
| Journal | Energy conversion and management |
| Volume | 195 |
| DOIs | |
| Publication status | Published - 1 Sep 2019 |
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Keywords
- Light oil
- Oxy-fuel combustion
- Syngas
- Thermochemical recuperation
- Tri-reforming
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering
- Fuel Technology
- Energy Engineering and Power Technology
Cite this
Thermochemical analysis and experimental investigation of a recuperative waste heat recovery system for the tri-reforming of light oil. / Gaber, Christian; Demuth, Martin; Schluckner, Christoph; Hochenauer, Christoph.
In: Energy conversion and management, Vol. 195, 01.09.2019, p. 302-312.Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Thermochemical analysis and experimental investigation of a recuperative waste heat recovery system for the tri-reforming of light oil
AU - Gaber, Christian
AU - Demuth, Martin
AU - Schluckner, Christoph
AU - Hochenauer, Christoph
PY - 2019/9/1
Y1 - 2019/9/1
N2 - This paper presents a thermochemical and experimental investigation into the use of oxy-fuel exhaust gases for the tri-reforming of light oil. The thermochemical recuperation of light oil makes it possible for the furnace to burn hydrogen-rich syngas, and thereby significantly improve furnace efficiency. This study investigates three process parameters: the exhaust gas recirculation rate, the syngas temperature, and the exhaust gas temperature. (1) The more exhaust gas that is recirculated, the less oxygen is required for complete conversion into syngas, and the higher the heating value of the produced syngas. A maximum increase in the heating value of 31.6% (compared to the primary fuel) is possible if pure bi-reforming is performed. (2) The chemical equilibrium calculations showed that the syngas temperature has a strong effect on the composition of the syngas; a syngas temperature of 1265 °C is necessary to achieve a conversion rate of 99.9%. The thermodynamic analysis was performed using the Gibbs free energy minimization method. In order to prevent carbon formation, a slight oxygen excess of 1% must be present. In this case, a syngas temperature of 970 °C is sufficient for the stationary tri-reforming of light oil. (3) The energy required for reforming the primary fuel increases with increased syngas temperature, while the energy contained in the hot exhaust gas stream increases with increased exhaust gas temperature. In order to achieve a syngas temperature of at least 970 °C, both the required exhaust gas recirculation rate and the amount of oxygen for reforming and combustion are directly dependent on the temperature of the exhaust gas. An exhaust gas temperature of 1000 °C requires an exhaust gas recirculation rate of 16.2%, while a recirculation rate of 26.9% is necessary at an exhaust gas temperature of 1600 °C. In the latter case, it is possible to increase the efficiency of the oxy-fuel furnace by 22.8%.
AB - This paper presents a thermochemical and experimental investigation into the use of oxy-fuel exhaust gases for the tri-reforming of light oil. The thermochemical recuperation of light oil makes it possible for the furnace to burn hydrogen-rich syngas, and thereby significantly improve furnace efficiency. This study investigates three process parameters: the exhaust gas recirculation rate, the syngas temperature, and the exhaust gas temperature. (1) The more exhaust gas that is recirculated, the less oxygen is required for complete conversion into syngas, and the higher the heating value of the produced syngas. A maximum increase in the heating value of 31.6% (compared to the primary fuel) is possible if pure bi-reforming is performed. (2) The chemical equilibrium calculations showed that the syngas temperature has a strong effect on the composition of the syngas; a syngas temperature of 1265 °C is necessary to achieve a conversion rate of 99.9%. The thermodynamic analysis was performed using the Gibbs free energy minimization method. In order to prevent carbon formation, a slight oxygen excess of 1% must be present. In this case, a syngas temperature of 970 °C is sufficient for the stationary tri-reforming of light oil. (3) The energy required for reforming the primary fuel increases with increased syngas temperature, while the energy contained in the hot exhaust gas stream increases with increased exhaust gas temperature. In order to achieve a syngas temperature of at least 970 °C, both the required exhaust gas recirculation rate and the amount of oxygen for reforming and combustion are directly dependent on the temperature of the exhaust gas. An exhaust gas temperature of 1000 °C requires an exhaust gas recirculation rate of 16.2%, while a recirculation rate of 26.9% is necessary at an exhaust gas temperature of 1600 °C. In the latter case, it is possible to increase the efficiency of the oxy-fuel furnace by 22.8%.
KW - Light oil
KW - Oxy-fuel combustion
KW - Syngas
KW - Thermochemical recuperation
KW - Tri-reforming
UR - http://www.scopus.com/inward/record.url?scp=85065392608&partnerID=8YFLogxK
U2 - 10.1016/j.enconman.2019.04.086
DO - 10.1016/j.enconman.2019.04.086
M3 - Article
VL - 195
SP - 302
EP - 312
JO - Energy conversion and management
JF - Energy conversion and management
SN - 0196-8904
ER -