Self-circulation thermal extraction method and device for salt gradient solar pond

Abstract

The invention relates to the technical field of salt gradient solar pond thermal extraction, in particular to a self-circulation thermal extraction method and device for a salt gradient solar pond. The self-circulation thermal extraction method and device for the salt gradient solar pond are characterized in that one end of a circulation canal is connected with a lower troposphere of the salt gradient solar pond; hot brine under the driving of density contrast caused by temperature difference flows into a heat charge and discharge device arranged on the other end of the circulation canal; brine releases heat in the heat charge and discharge device so that temperature lowers and density increases; and therefore cool brine after the heat releasing flows back to the lower troposphere of the salt gradient solar pond along the bottom of the circulation canal, so that self-circulation thermal extraction is finished. The heat charge and discharge device is provided with a heat exchanger, a cold fluid inlet and a hot fluid outlet, wherein the cold fluid inlet is used for heat extraction for users and the hot fluid outlet is after heat exchange, and thus the heat in the hot charge and discharge device is constantly supplied to users.

Description

technical field [0001] The invention relates to the technical field of heat extraction of salt gradient solar ponds, in particular to a method and device for self-circulation heat improvement of salt gradient solar ponds. Background technique [0002] With the massive development and consumption of fossil energy, the problem of resource shortage has become more and more prominent, and issues such as environmental pollution have also been raised continuously. As a renewable energy source, solar energy has the advantages of abundant reserves and no pollution. The salt gradient solar pond is a solar energy utilization method that integrates the absorption and storage of solar energy. It is composed of the upper troposphere, the non-troposphere and the lower troposphere. Density gradient can inhibit natural convection caused by temperature difference, and the brine with high temperature at the bottom will not float up, which can effectively inhibit heat convection and play a ro...

AI Technical Summary

Problems solved by technology

The indirect heat raising method is to install an internal heat exchanger in the heat storage layer of the salt gradient solar pond, and the heat is transferred to the outside of the salt gradient solar pond through the internal heat exchanger. This method is expensive and troublesome to maintain, and is only suitable for small and medium-sized solar ponds. Low heat utilization efficiency

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