The Experts below are selected from a list of 3363 Experts worldwide ranked by ideXlab platform
Gerald Debenest - One of the best experts on this subject based on the ideXlab platform.
-
co current combustion of oil shale part 1 characterization of the solid and gaseous products
Fuel, 2010Co-Authors: M F Martins, Sylvain Salvador, J F Thovert, Gerald DebenestAbstract:Abstract Co-current combustion front propagation in a bed of crushed oil shale (OS) leads to the production of liquid oil, of a flue gas and of a solid residue. The objective of this paper was to provide a detailed chemical characterization of Timahdit oil shale and of its smoldering combustion products. The amount of fixed carbon (FC) formed during devolatilization is measured at 4.7% of the initial mass of oil shale whatever the heating rate in the range 50–900 K min −1 . The combustion of oil shale was operated using a mix of 75/25 wt. of OS/sand with an air supply of 1460 l min −1 m −2 . In these conditions, not all the FC is oxidized at the passage of the front, but 88% only, with a partitioning of 56.5% into CO and the rest into CO 2 . A Calorific gas with a Lower Calorific Value of 54 kJ mol −1 is produced. Approximately 52% of the organic matter from OS is recovered as liquid oil. The front decarbonates 83% of carbonates.
-
Co-current combustion of oil shale – Part 1: Characterization of the solid and gaseous products
Fuel, 2010Co-Authors: M F Martins, Sylvain Salvador, J F Thovert, Gerald DebenestAbstract:Abstract Co-current combustion front propagation in a bed of crushed oil shale (OS) leads to the production of liquid oil, of a flue gas and of a solid residue. The objective of this paper was to provide a detailed chemical characterization of Timahdit oil shale and of its smoldering combustion products. The amount of fixed carbon (FC) formed during devolatilization is measured at 4.7% of the initial mass of oil shale whatever the heating rate in the range 50–900 K min −1 . The combustion of oil shale was operated using a mix of 75/25 wt. of OS/sand with an air supply of 1460 l min −1 m −2 . In these conditions, not all the FC is oxidized at the passage of the front, but 88% only, with a partitioning of 56.5% into CO and the rest into CO 2 . A Calorific gas with a Lower Calorific Value of 54 kJ mol −1 is produced. Approximately 52% of the organic matter from OS is recovered as liquid oil. The front decarbonates 83% of carbonates.
Zissis Samaras - One of the best experts on this subject based on the ideXlab platform.
-
Experimental study of combustion in a spark ignition engine operating with producer gas from various biomass feedstocks
Fuel, 2014Co-Authors: Stefanos Tsiakmakis, Dimitrios Mertzis, Athanasios Dimaratos, Zisimos Toumasatos, Zissis SamarasAbstract:Abstract Spark-ignition engines running on gaseous fuels are commonly used for combined heat and power (CHP) production. In the present work, an experimental investigation has been conducted in order to study combustion in a spark-ignition engine fueled with producer gas. The engine is a single cylinder one, coupled to a fluidized bed gasifier in a mobile combined heat and power (CHP) production unit. Three biomass feedstocks were evaluated, which are olive, peach and grape kernels. Mixtures of each producer gas separately with propane at various blending ratios were fed to the engine, operating at various engine speeds. Cylinder pressure measurements were performed, followed by heat release rate analysis. Loss in power output compared to neat propane operation was experienced, owing to the Lower Calorific Value of the producer gas, independently of the feedstock. Additionally, Lower cylinder pressures and heat release rates were observed, coupled to prolonged combustion duration. Finally, combustion stability was moderately affected by the introduction of producer gas.
D. Kolev - One of the best experts on this subject based on the ideXlab platform.
-
A new type of a gas–steam turbine cycle with increased efficiency
Applied Thermal Engineering, 2001Co-Authors: Nikolai Kolev, Karlheinz Schaber, D. KolevAbstract:Abstract A new system with a gas–steam turbine particularly effective for district heating systems is proposed. Compared to the existing combined installations, including a gas turbine, a waste heat utilization and a steam turbine, it shows significantly Lower capital cost and an increase of the thermodynamic efficiency. The simultaneous expansion of gas and steam in one turbine, as well as the utilization of the heat of condensation of the waste gases at the installation outlet allows the overall thermodynamic efficiency, calculated on the basis of the Lower Calorific Value, to reach 108.7%.
Stefanos Tsiakmakis - One of the best experts on this subject based on the ideXlab platform.
-
Experimental study of combustion in a spark ignition engine operating with producer gas from various biomass feedstocks
Fuel, 2014Co-Authors: Stefanos Tsiakmakis, Dimitrios Mertzis, Athanasios Dimaratos, Zisimos Toumasatos, Zissis SamarasAbstract:Abstract Spark-ignition engines running on gaseous fuels are commonly used for combined heat and power (CHP) production. In the present work, an experimental investigation has been conducted in order to study combustion in a spark-ignition engine fueled with producer gas. The engine is a single cylinder one, coupled to a fluidized bed gasifier in a mobile combined heat and power (CHP) production unit. Three biomass feedstocks were evaluated, which are olive, peach and grape kernels. Mixtures of each producer gas separately with propane at various blending ratios were fed to the engine, operating at various engine speeds. Cylinder pressure measurements were performed, followed by heat release rate analysis. Loss in power output compared to neat propane operation was experienced, owing to the Lower Calorific Value of the producer gas, independently of the feedstock. Additionally, Lower cylinder pressures and heat release rates were observed, coupled to prolonged combustion duration. Finally, combustion stability was moderately affected by the introduction of producer gas.
M F Martins - One of the best experts on this subject based on the ideXlab platform.
-
co current combustion of oil shale part 1 characterization of the solid and gaseous products
Fuel, 2010Co-Authors: M F Martins, Sylvain Salvador, J F Thovert, Gerald DebenestAbstract:Abstract Co-current combustion front propagation in a bed of crushed oil shale (OS) leads to the production of liquid oil, of a flue gas and of a solid residue. The objective of this paper was to provide a detailed chemical characterization of Timahdit oil shale and of its smoldering combustion products. The amount of fixed carbon (FC) formed during devolatilization is measured at 4.7% of the initial mass of oil shale whatever the heating rate in the range 50–900 K min −1 . The combustion of oil shale was operated using a mix of 75/25 wt. of OS/sand with an air supply of 1460 l min −1 m −2 . In these conditions, not all the FC is oxidized at the passage of the front, but 88% only, with a partitioning of 56.5% into CO and the rest into CO 2 . A Calorific gas with a Lower Calorific Value of 54 kJ mol −1 is produced. Approximately 52% of the organic matter from OS is recovered as liquid oil. The front decarbonates 83% of carbonates.
-
Co-current combustion of oil shale – Part 1: Characterization of the solid and gaseous products
Fuel, 2010Co-Authors: M F Martins, Sylvain Salvador, J F Thovert, Gerald DebenestAbstract:Abstract Co-current combustion front propagation in a bed of crushed oil shale (OS) leads to the production of liquid oil, of a flue gas and of a solid residue. The objective of this paper was to provide a detailed chemical characterization of Timahdit oil shale and of its smoldering combustion products. The amount of fixed carbon (FC) formed during devolatilization is measured at 4.7% of the initial mass of oil shale whatever the heating rate in the range 50–900 K min −1 . The combustion of oil shale was operated using a mix of 75/25 wt. of OS/sand with an air supply of 1460 l min −1 m −2 . In these conditions, not all the FC is oxidized at the passage of the front, but 88% only, with a partitioning of 56.5% into CO and the rest into CO 2 . A Calorific gas with a Lower Calorific Value of 54 kJ mol −1 is produced. Approximately 52% of the organic matter from OS is recovered as liquid oil. The front decarbonates 83% of carbonates.
