Layered energy storage system capable of supplying steam at constant temperature for molten salt

Abstract

The invention discloses a layered energy storage system capable of supplying steam at a constant temperature for molten salt. A plurality of partition plates are arranged in a heat storage tank from top to bottom, wherein each partition plate is provided with an overflow hole; a heater comprises a plurality of heat exchange tubes which are sequentially communicated; each heat exchange tube is located between the adjacent partition plates at the bottom layer of the heat storage tank; an outlet of a water inlet pipeline is divided into two paths, wherein one path is communicated with an inlet ofthe heater and the other path is communicated with a water inlet of a spray type desuperheater through a desuperheating water pipeline; a first adjusting valve is arranged on the desuperheating waterpipeline; and an outlet of the heater is communicated with a steam pipeline through the spray type desuperheater; the bottom outlet of the heat storage tank is communicated with an inlet of an electric heating furnace through a circulating pump; and an outlet of the electric heating furnace is communicated with the top inlet of the heat storage tank. The system has the characteristics of high heat storage capacity and wide molten salt operating temperature range, and can meet the requirement of the steam outlet temperature.

Description

technical field [0001] The invention belongs to the field of industrial and civil production, and in particular relates to a molten salt layered energy storage system capable of supplying steam at a constant temperature. Background technique [0002] In recent years, due to the rising demand for energy storage, molten salt has become more and more widely used as a heat storage medium. The working temperature of the molten salt is between 150°C and 550°C, and the medium and low temperature molten salt or the high temperature molten salt can be selected according to specific needs. Since the specific heat of molten salt is about 1.4kJ / (kg·K), which is much smaller than that of water, the heat storage temperature difference is large. The heat storage temperature of the molten salt is high at the initial stage of heat release, and the steam outlet temperature is too high; as the molten salt continues to release heat, the temperature of the molten salt drops rapidly, and the tem...

AI Technical Summary

Problems solved by technology

Since the specific heat of molten salt is about 1.4kJ / (kg K), which is much smaller than that of water, the heat storage temperature difference is large

The heat storage temperature of the molten salt is high at the initial stage of heat release, and the steam outlet temperature is too high; as the molten salt continues to release heat, the temperature of the molten salt drops rapidly, and the temperature of the steam outlet also decreases, especially in the later stage of heat release. The outlet temperature is too low to meet the production demand, thus compressing the working temperature range of the molten salt and reducing the heat storage capacity

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