Combined fused salt energy storage peak shaving system and method utilizing steam exhaust and heat storage of medium-pressure cylinder

Abstract

The invention discloses a combined fused salt energy storage peak shaving system and method utilizing steam exhaust and heat storage of a medium-pressure cylinder, the system comprises a high-parameter fused salt energy storage system, a low-parameter fused salt energy storage system and an existing thermal power generating unit, and the high-parameter fused salt energy storage system and the low-parameter fused salt energy storage system are provided with electric heaters used for heating fused salt. The electric energy input ends of the electric heaters are connected with the electric energy output end of the existing thermal power generating unit; a low-parameter fused salt heat absorption loop and a low-parameter fused salt heat release loop are arranged in the low-parameter fused salt energy storage system, the low-parameter fused salt heat absorption loop uses low-grade steam and an electric heater to heat low-parameter fused salt for energy storage, and the high-parameter fused salt heat absorption loop uses an electric heater to heat high-parameter low-temperature fused salt for energy storage; the low-parameter fused salt heat release loop and the high-parameter fused salt heat release loop utilize fused salt heat release to heat feed water to generate superheated steam, the superheated steam enters the thermal power generating unit to do work, the electric heater has high-power electricity utilization, and rapid frequency modulation of the unit can be achieved. And peak regulation of the unit can be realized in the energy release stage.

Description

technical field [0001] The invention belongs to the technical field of molten salt energy storage, and in particular relates to a combined molten salt energy storage peak regulation system and method utilizing medium-pressure cylinder exhaust steam to store heat. Background technique [0002] In order to build a "new power system with new energy as the main body", it is necessary for thermal power plants to transform into a "basic guarantee and system regulation" power source. At the national policy level, vigorously promote the "three reforms and linkages" of coal power energy saving and carbon reduction transformation, flexibility transformation, and heating transformation, and promote the large-scale application of advanced energy storage technology. At present, there is no universal flexible transformation plan for different types of thermal power plants. One strategy is needed for each plant, and the plan is formulated according to specific scenarios. There are two pat...

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Problems solved by technology

Due to the high pressure level of the main steam, the irreversible loss after being extracted into the molten salt for heat exchange is large, and the pipeline with a high pressure level needs to be modified, and the system cost is relatively high; on the other hand, the steam with a high parameter level enters the deaerator after heat exchange. Requires expansion of existing deaerator

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