We report the development of technology that may contribute to a reduction in greenhouse gas emissions and improve the energy efficiency of the CO2 capture process. Lithium ortho-silicate is a suitable solid sorbent f...We report the development of technology that may contribute to a reduction in greenhouse gas emissions and improve the energy efficiency of the CO2 capture process. Lithium ortho-silicate is a suitable solid sorbent for capturing CO2. This reversible chemical reaction is also applicable to chemical heat storage. The absorption reaction characteristics of lithium ortho-silicate were studied by a thermogravimetric method and a volumetric method that demonstrated the influence of heat and mass transfer limitations in a packed bed designed to be as small as possible. We developed a method for measuring the absorption reaction characteristics in the experiments. In the experiments, a constant conversion fraction of 60% was observed. The reaction system was stable to repetition. The CO2 absorption rate depends on the CO2 pressure and reactor temperature. The absorption rate was determined at several reactor temperatures when the conversion fraction was 0.3. In this study, the maximum absorption rate was obtained at 670oC. It was demonstrated that lithium ortho-silicate is suitable for use in a chemical heat storage system.展开更多
Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of...Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of low-grade exhaust heat that is cooler than 200<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C. Heat discharging and charging were conducted through the CaCl<sub>2</sub> hydration reaction. A silicon carbide honeycomb was adopted to improve heat transfer in the CaCl<sub>2</sub> packed bed. The heat storage, condenser, and evaporator temperature were set at 150<span style="white-space:nowrap;">°</span>C, 30<span style="white-space:nowrap;">°</span>C and 90<span style="white-space:nowrap;">°</span>C respectively. Repeated trials and experiments are time consuming for optimizing design of the equipment. Therefore, in this research, we constructed a simulation that can predict the performance of the device. A numerical simulation model was utilized in preparation for the design of the heat storage module. The consistency of both the simulation and the experimental results was confirmed by comparing them.展开更多
Science is the basis of the country’s development and wealth. In particular, it is necessary to effectively use advanced scientific developments and technical achievements in order to strengthen the economy in the pe...Science is the basis of the country’s development and wealth. In particular, it is necessary to effectively use advanced scientific developments and technical achievements in order to strengthen the economy in the period when the desire for innovation in all fields is still growing. In theoretical-experimental Scientific Research work, both theoretical and experimental results are achieved, and it is more useful to withstand more theoretical-experimental loads for a longer period of time. The occurrences in the production process of natural wool fiber technologists are a complex of physical and mechanical phenomena, which can be used only by the modern achievements of science and technology. In most cases, the parameter relationship with the factors influencing the technological process or the object can open a curve without any other things.展开更多
文摘We report the development of technology that may contribute to a reduction in greenhouse gas emissions and improve the energy efficiency of the CO2 capture process. Lithium ortho-silicate is a suitable solid sorbent for capturing CO2. This reversible chemical reaction is also applicable to chemical heat storage. The absorption reaction characteristics of lithium ortho-silicate were studied by a thermogravimetric method and a volumetric method that demonstrated the influence of heat and mass transfer limitations in a packed bed designed to be as small as possible. We developed a method for measuring the absorption reaction characteristics in the experiments. In the experiments, a constant conversion fraction of 60% was observed. The reaction system was stable to repetition. The CO2 absorption rate depends on the CO2 pressure and reactor temperature. The absorption rate was determined at several reactor temperatures when the conversion fraction was 0.3. In this study, the maximum absorption rate was obtained at 670oC. It was demonstrated that lithium ortho-silicate is suitable for use in a chemical heat storage system.
文摘Chemical heat storage is a promising technology for improving thermal energy efficiency. In this study, CaCl<sub>2</sub> and H<sub>2</sub>O were selected as a reaction system for utilization of low-grade exhaust heat that is cooler than 200<span style="white-space:nowrap;"><span style="white-space:nowrap;">°</span></span>C. Heat discharging and charging were conducted through the CaCl<sub>2</sub> hydration reaction. A silicon carbide honeycomb was adopted to improve heat transfer in the CaCl<sub>2</sub> packed bed. The heat storage, condenser, and evaporator temperature were set at 150<span style="white-space:nowrap;">°</span>C, 30<span style="white-space:nowrap;">°</span>C and 90<span style="white-space:nowrap;">°</span>C respectively. Repeated trials and experiments are time consuming for optimizing design of the equipment. Therefore, in this research, we constructed a simulation that can predict the performance of the device. A numerical simulation model was utilized in preparation for the design of the heat storage module. The consistency of both the simulation and the experimental results was confirmed by comparing them.
文摘Science is the basis of the country’s development and wealth. In particular, it is necessary to effectively use advanced scientific developments and technical achievements in order to strengthen the economy in the period when the desire for innovation in all fields is still growing. In theoretical-experimental Scientific Research work, both theoretical and experimental results are achieved, and it is more useful to withstand more theoretical-experimental loads for a longer period of time. The occurrences in the production process of natural wool fiber technologists are a complex of physical and mechanical phenomena, which can be used only by the modern achievements of science and technology. In most cases, the parameter relationship with the factors influencing the technological process or the object can open a curve without any other things.
