Large-capacity electric power storage system using thermal energy/chemical potential

Abstract

The present invention relates to a large-capacity electric power storage system using saline water, the system being capable of separating saline water into high-density saline water and fresh water and storing them using surplus power, during a low load, and producing power using the density difference between the high-density saline water and fresh water when power consumption increases rapidly, i.e. during a peak load. A super-large-capacity power storage system using saline water comprises: a condensation device for condensing/separating saline water and supplying condensed saline water and fresh water; a condensed saline water storage device and a fresh water storage device for storing the condensed saline water and fresh water supplied from the condensation device, respectively; a salinity difference power generation device connected to the condensed saline water storage device and the fresh water storage device to generate power using the density difference between the condensed saline water and fresh water; and a saline water storage device for storing saline water, which has passed through the salinity difference power generation device, and supplying the condensation device with saline water.

Description

technical field [0001] The present invention relates to a large-capacity power storage system using thermal energy and chemical potential, and more particularly, to a large-capacity power storage system using brine capable of separating brine into high-concentration using excess power during periods of low load salt water and fresh water to store it, and use the difference in concentration between highly concentrated brine and fresh water during peak loads (during which there is a rapidly growing power consumption) to generate electricity, and use waste heat to raise The temperature of salt water and fresh water to raise the chemical potential in conventional equipment. Background technique [0002] In centralized power generation such as thermal power generation or nuclear power generation, there is a disadvantage that in order to meet peak power demand, a large-scale backup power should usually be prepared in advance even if the operating rate of the equipment will be redu...

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Problems solved by technology

[0006] Except for pumping power generation and CAES, the large-capacity power storage systems described above require high initial investment costs and have limitations in storage capacity (less than 1GW), so it is difficult to use GW-level large-capacity power Storage System

[0007] In addition, pumping type power generation with low initial investment cost poses a problem that its own construction is difficult because of restrictions on site selection and risk of disturbing the ecosystem (Korean Patent Registration No. 10-102056)

[0008] In addition, CAES has limitations in use because it is necessary to find a sufficiently solid ground to store compressed air (Korean Patent Laid-Open Publication No. 10-2011-7026187)

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