Solar-driven salinity gradient power generation system and method based on synergistic interaction of capillary force and temperature difference

Abstract

The invention discloses a solar-driven salinity gradient power generation system and method based on synergistic interaction of capillary force and temperature difference. Sunlight can continuously provide heat for the system, and a solution can be spontaneously transported upwards under the action of reverse gravity through the capillary action. In the system, a solar seawater evaporation module generates fresh water and concentrated seawater to be used by a power generation module, and the concentration difference of two cavities of the power generation module is maintained. The capillary force in a capillary core of the power generation module enables the solution to be transported to the surface for evaporation against gravity, absorbs sunlight heat and conducts heat, so that the temperature of a first concentration chamber is higher than that of a second concentration chamber, and the concentration of the second concentration chamber is higher than that of the first concentration chamber. Under the synergistic effect of the temperature difference Sore effect, the concentration gradient and the internal capillary force of the cation selective membrane, cations are directionally migrated to the first concentration chamber from the second concentration chamber through a cation selective membrane, and electric energy is continuously output to an external circuit.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a salinity difference power generation system and method in which solar energy drives capillary force and temperature difference synergy. Background technique [0002] Solar energy is an inexhaustible and inexhaustible clean energy. Solar power generation methods can be divided into solar photovoltaic power generation and solar thermal power generation. Solar photovoltaic power generation is safe and reliable, with high energy quality, but the distribution density of irradiated energy is small, and the cost of power generation is high. Solar thermal power generation can realize energy storage and continuous power generation, but it is still in the stage of technological innovation and improvement in our country. In addition, the ocean contains huge energy reserves, including wave energy, tidal energy, ocean temperature difference energy and salt difference energy, which...

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Problems solved by technology

For example, the patent CN110932600A uses solar heat to heat the solution, and designs a power generation method based on temperature difference to drive ion directional migration. However, temperature difference is the only driving force, which cannot maintain stable power output and the power generation process is unsustainable.

Another example is patent CN110980850A, which uses the combined effect of the transmembrane potential difference, transmembrane concentration difference and ion thermal diffusion of ions in seawater to design a seawater power generation and freshwater acquisition device. However, the natural evaporation is slow, and the formed concentration difference is not enough. Ensure the stability of power output, so there is still room for further improvement in the final power generation performance

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