The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Daniel Wuillemin - One of the best experts on this subject based on the ideXlab platform.
-
solar chemical Reactor Technology for industrial production of lime
Solar Energy, 2006Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:Abstract We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO 3 (s) → CaO(s) + CO 2 (g) at 1200–1400 K. The indirect heating 10 kW th multi-tube rotary kiln prototype processed 1–5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor’s efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg −1 ) divided by the solar energy input, reached 30–35% for quicklime production rates up to 4 kg h −1 . The solar lime Reactor prototype operated reliably for more than 100 h at solar flux inputs of about 2000 kW m −2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO 2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MW th industrial solar calcination plant is estimated in the range 131–158 $/t, i.e. about 2–3 times the current selling price of conventional lime.
-
Solar Chemical Reactor Technology for the Industrial Solar Production of Lime
2004Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO3 → CaO + CO2 at 1200-1400 K. The indirect heating 10 kW multi-tube rotary kiln prototype processed 1-5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor's chemical efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg -1 ) divided by the solar energy input, reached 30-35% for quicklime production rates up to 4 kg h -1 . The solar lime Reactor prototype operated reliably for more than 100 hours at solar flux inputs of about 2000 kW m -2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MWth industrial solar calcination plant is estimated in the range 131-158 $/t, i.e. about 2-3 times the current selling price of conventional lime.
Wojciech Lipinski - One of the best experts on this subject based on the ideXlab platform.
-
solar chemical Reactor Technology for industrial production of lime
Solar Energy, 2006Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:Abstract We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO 3 (s) → CaO(s) + CO 2 (g) at 1200–1400 K. The indirect heating 10 kW th multi-tube rotary kiln prototype processed 1–5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor’s efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg −1 ) divided by the solar energy input, reached 30–35% for quicklime production rates up to 4 kg h −1 . The solar lime Reactor prototype operated reliably for more than 100 h at solar flux inputs of about 2000 kW m −2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO 2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MW th industrial solar calcination plant is estimated in the range 131–158 $/t, i.e. about 2–3 times the current selling price of conventional lime.
-
Solar Chemical Reactor Technology for the Industrial Solar Production of Lime
2004Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO3 → CaO + CO2 at 1200-1400 K. The indirect heating 10 kW multi-tube rotary kiln prototype processed 1-5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor's chemical efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg -1 ) divided by the solar energy input, reached 30-35% for quicklime production rates up to 4 kg h -1 . The solar lime Reactor prototype operated reliably for more than 100 hours at solar flux inputs of about 2000 kW m -2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MWth industrial solar calcination plant is estimated in the range 131-158 $/t, i.e. about 2-3 times the current selling price of conventional lime.
R T Dobson - One of the best experts on this subject based on the ideXlab platform.
-
theoretical and experimental modelling of a heat pipe heat exchanger for high temperature nuclear Reactor Technology
Applied Thermal Engineering, 2013Co-Authors: Ryno Laubscher, R T DobsonAbstract:Abstract High temperature heat sources are becoming an ever-increasing imperative in the processing industries for the production of various plastics, fertilisers, coal-to-liquid fuel and hydrogen generation. Current high temperature Reactor Technology is capable of producing Reactor coolant temperatures in excess of 950 °C. At these temperatures, tritium which is a radioactive contaminant found in the Reactor coolant stream, is able to contaminate the secondary stream by diffusing through the steel retaining wall of the heat exchanger between the Reactor coolant and secondary process coolant stream. Current regulations therefore require an extra intermediate heat transfer loop to ensure no cross contamination. A novel heat pipe heat exchanger design is presented which circumvents the need for an intermediate coolant loop. This is done by physically separating the Reactor coolant and secondary coolant by two pipe walls and a vapour section and a liquid section. A theoretical transient heat transfer model of such a device is presented. The model uses separate hot gas heating fluid and cold water cooling fluid control volumes, and for the internal working fluid a control volume consisting of a liquid and its vapour in equilibrium with each other. A 2 kW rated experimental model was constructed and tested, using Dowtherm-A as working fluid, to validate the heat pipe heat exchanger theoretical model and design. By determining the boiling heat transfer coefficient through the use of an experimentally formulated correlation it was shown that the theoretical model is indeed able to simulate the characteristic chaotic behaviour, due to the boiling and condensation processes, of the device to within a reasonable level of accuracy. It is concluded that the theoretical simulation model can be used to predict the performance of a higher temperature sodium-charged heat pipe heat exchanger, provided suitable boiling and condensation heat transfer coefficients are used.
-
heat pipe heat exchanger for high temperature nuclear Reactor Technology
Frontiers in Heat Pipes (FHP), 2013Co-Authors: R T Dobson, Ryno LaubscherAbstract:CITATION: Dobson, R. T. & Laubscher, R. 2013. Heat pipe heat exchanger for high temperature nuclear Reactor Technology, Frontiers in Heat Pipes, 4, 023002, doi:10.5098/fhp.v4.2.3002.
Anton Meier - One of the best experts on this subject based on the ideXlab platform.
-
solar chemical Reactor Technology for industrial production of lime
Solar Energy, 2006Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:Abstract We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO 3 (s) → CaO(s) + CO 2 (g) at 1200–1400 K. The indirect heating 10 kW th multi-tube rotary kiln prototype processed 1–5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor’s efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg −1 ) divided by the solar energy input, reached 30–35% for quicklime production rates up to 4 kg h −1 . The solar lime Reactor prototype operated reliably for more than 100 h at solar flux inputs of about 2000 kW m −2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO 2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MW th industrial solar calcination plant is estimated in the range 131–158 $/t, i.e. about 2–3 times the current selling price of conventional lime.
-
Solar Chemical Reactor Technology for the Industrial Solar Production of Lime
2004Co-Authors: Anton Meier, Enrico Bonaldi, Gian Mario Cella, Wojciech Lipinski, Daniel WuilleminAbstract:We developed the solar chemical Reactor Technology to effect the endothermic calcination reaction CaCO3 → CaO + CO2 at 1200-1400 K. The indirect heating 10 kW multi-tube rotary kiln prototype processed 1-5 mm limestone particles, producing high purity lime that is not contaminated with combustion by-products. The quality of the solar produced quicklime meets highest industrial standards in terms of reactivity (low, medium, and high) and degree of calcination (exceeding 98%). The Reactor's chemical efficiency, defined as the enthalpy of the calcination reaction at ambient temperature (3184 kJ kg -1 ) divided by the solar energy input, reached 30-35% for quicklime production rates up to 4 kg h -1 . The solar lime Reactor prototype operated reliably for more than 100 hours at solar flux inputs of about 2000 kW m -2 , withstanding the thermal shocks that occur in solar high temperature applications. By substituting concentrated solar energy for fossil fuels as the source of process heat, one can reduce by 20% the CO2 emissions in a state-of-the-art lime plant and by 40% in a conventional cement plant. The cost of solar lime produced in a 20 MWth industrial solar calcination plant is estimated in the range 131-158 $/t, i.e. about 2-3 times the current selling price of conventional lime.
Ryno Laubscher - One of the best experts on this subject based on the ideXlab platform.
-
theoretical and experimental modelling of a heat pipe heat exchanger for high temperature nuclear Reactor Technology
Applied Thermal Engineering, 2013Co-Authors: Ryno Laubscher, R T DobsonAbstract:Abstract High temperature heat sources are becoming an ever-increasing imperative in the processing industries for the production of various plastics, fertilisers, coal-to-liquid fuel and hydrogen generation. Current high temperature Reactor Technology is capable of producing Reactor coolant temperatures in excess of 950 °C. At these temperatures, tritium which is a radioactive contaminant found in the Reactor coolant stream, is able to contaminate the secondary stream by diffusing through the steel retaining wall of the heat exchanger between the Reactor coolant and secondary process coolant stream. Current regulations therefore require an extra intermediate heat transfer loop to ensure no cross contamination. A novel heat pipe heat exchanger design is presented which circumvents the need for an intermediate coolant loop. This is done by physically separating the Reactor coolant and secondary coolant by two pipe walls and a vapour section and a liquid section. A theoretical transient heat transfer model of such a device is presented. The model uses separate hot gas heating fluid and cold water cooling fluid control volumes, and for the internal working fluid a control volume consisting of a liquid and its vapour in equilibrium with each other. A 2 kW rated experimental model was constructed and tested, using Dowtherm-A as working fluid, to validate the heat pipe heat exchanger theoretical model and design. By determining the boiling heat transfer coefficient through the use of an experimentally formulated correlation it was shown that the theoretical model is indeed able to simulate the characteristic chaotic behaviour, due to the boiling and condensation processes, of the device to within a reasonable level of accuracy. It is concluded that the theoretical simulation model can be used to predict the performance of a higher temperature sodium-charged heat pipe heat exchanger, provided suitable boiling and condensation heat transfer coefficients are used.
-
heat pipe heat exchanger for high temperature nuclear Reactor Technology
Frontiers in Heat Pipes (FHP), 2013Co-Authors: R T Dobson, Ryno LaubscherAbstract:CITATION: Dobson, R. T. & Laubscher, R. 2013. Heat pipe heat exchanger for high temperature nuclear Reactor Technology, Frontiers in Heat Pipes, 4, 023002, doi:10.5098/fhp.v4.2.3002.
