| dc.description.abstract | This research is currently one of a few research in Taiwan that has focused on reverse electrodialysis (RED), which has made an important contribution to the development of renewable energy in Taiwan. Energy issues are important international issues, and the development of renewable energy to replace traditional fossil fuel to reduce carbon dioxide (CO2) emissions are extremely important. Blue energy is a renewable energy that only exists in the ocean, including waves, tides, and salinity gradient power (SGD). Salinity gradient energy is the most efficient energy source among them, and RED is the most effective way to collect energy. The fundamental mechanism of RED is to use staggered anion and cation exchange membranes to form compartments that concentrated and dilute salt water can flow through respectively. The salty water forms an ion flow due to the concentration gradient, a current is formed after the redox reactions, and then collected by an external circuit. According to the previous research, the carbon emission of traditional fossil fuel is 1004 g CO2/kWh for coal and 543 g CO2/kWh for natural gas. On the other hand, the carbon emission of salt gradient energy collected by RED is <10 g CO2/kWh. It has good competitiveness in terms of emission reduction. There are several factors affecting RED power generation, including solution conditions (concentration, type, flow rate, etc.), ion exchange membrane conditions, electrode system conditions, etc. This study mainly uses 5 pairs of 10 x 20 cm2 RED systems to conduct experiments. Various concentrations, space velocity, cell pairs and channel thickness are applied to compare the efficiency of power generation. Evaluation shows that the concentration of concentrated water and dilute water should be between 1 ~ 2.5 M NaCl and 0.02 ~ 0.05 M NaCl, and the concentration ratio should be higher than 50 : 1. The velocity of the solution affects the ion exchange efficiency and the resistance of the RED system. The velocity of the dilute water is higher than that of the concentrated water. When the overall flow rate of the RED system increases, the power of the RED power generation decreases first and then increases. After the pump energy consumption is taken into consideration. The better power density (0.328 W/m2) can be obtained with space velocity of 0.25-0.25 1/min (flow rate of 47.5, 47.5 mL/min). The cell pairs of RED system must be increased as much as possible to obtain more efficient energy generation. The thickness of the channel mainly affects the resistance of the RED system. The thickness design should be around 1 mm. This experiment mainly provides the establishment of the operating parameters of the first laboratory-level RED system in Taiwan, so as to provide a reference for follow-up research. | en_US |