Water-soluble cavity-making and energy-storing combined system and method

Abstract

The invention provides a water-soluble cavity-making and energy-storing combined system and method. The salt content of brine returned from the water-soluble cavity is increased, and popularization and application of a physical energy storage technology are also facilitated. The system comprises a pump turbine, a steam container, a brine pond and an underground salt cavern; a water inlet of the pump turbine is connected with upper clear liquid of the brine pond, an outlet of the pump turbine is connected to the steam container, and a valve is arranged between the pump turbine and the steam container; a water end outlet of the steam container is connected to the underground salt cavern, and a water end valve is arranged on the pipeline; a steam end outlet of the steam container is connected to the top of the underground salt cavern; the bottom of the underground salt cavern is in communication with the brine pond through a pipeline; and a connecting pipeline is arranged between the brine pond and the inlet of the pump turbine. According to the system, the fixing mode that a water pump and a water turbine set are arranged based on high and low water levels in a traditional pumped storage system is changed, flexible arrangement of the water pump and the water turbine can be achieved according to the simple and convenient operation principle, and meanwhile water-soluble cavity-making and energy-storing dual-system utilization can be conducted.

Description

technical field [0001] The invention belongs to the technical field of physical energy storage, and in particular relates to a combined system and method for water-soluble cavity forming energy storage. Background technique [0002] In my country, salt caverns are rich in resources, and salt caverns are becoming more and more widely used as gas and oil storage spaces. Large-scale and low-cost construction of salt cavern gas storage is an urgent issue. In the process of traditional salt cavern cavity building, water-soluble cavity-building technology is often used to inject light brine or clean water into the salt layer. With the entry of clean water or light brine, the original brine in the salt layer solution cavity will be squeezed out. The process is repeated, and the salt in the salt layer is continuously brought out by the water, completing the water-soluble cavity-making process of the underground salt cavern. However, in the above-mentioned method, in order to ensur...

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Problems solved by technology

[0005] In order to solve the problems of high cost and limited energy storage space of the energy storage system in the medium and small-sized underground salt caverns in the prior art, the present invention provides a water-soluble cavity-forming energy storage combined system and method to increase the return of brine in the water-soluble cavity Salt content is also conducive to the promotion and application of physical energy storage technology

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