Single-tank heat storage and heat release device with cascaded phase change heat storage structure and its use method

Abstract

The invention discloses a single-tank heat and release device with a cascade type phase change heat storage structure. The single-tank heat and release device comprises a heat storage tank body, a cascade type phase change heat storage device, a heat release coiled tube heat exchange assembly and a heater, wherein the cascade type phase change heat storage device is distributed on the upper part in the heat storage tank body; the heat release coiled tube heat exchange assembly is arranged in the heat storage tank body from bottom to top; the heat release coiled tube heat exchange assembly is provided with an inlet and an outlet which are respectively connected to an energy utilization device; and the heater is distributed in the heat storage tank body, and is positioned below the heat release coiled tube heat exchange assembly. According to the single-tank heat storage and release device, the cascade type phase change heat storage device is additionally arranged, so that not only is storage of sensible heat and latent heat realized, but also outlet temperature stability of the heat storage tank is reinforced; night cheap valley electric energy is utilized to heat a heat storage medium in the heat storage tank body, so that heat storage is realized; and heat release stability time of the heat storage device is prolonged by virtue of the cascade type phase change heat storage device on the top in the tank.

Description

technical field [0001] The invention relates to the field of heat storage energy utilization, in particular to a single-tank heat storage and heat release device with a cascade phase change heat storage structure. Background technique [0002] With the continuous deterioration of the global environment, the rational and efficient use of energy has been raised to an unprecedented height. In order to reduce the emission of polluting gases, my country has not only reduced the use of coal for heating in winter, but at the same time, the effective utilization of low-peak electricity at night and industrial waste heat has also received widespread attention. Thermal storage devices can convert cheap electric energy at night or industrial waste heat into high-temperature thermal energy and store it. The stored thermal energy can be used directly for building heating, or it can be converted into electrical energy during peak electricity consumption periods. [0003] At present, the ...

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Problems solved by technology

[0003] At present, the relatively mature heat storage method for high-temperature solar heat utilization is double-tank sensible heat storage. The heat storage device is huge, and the system investment and maintenance costs are high. In order to reduce the cost of heat storage, the applicant's patent ZL201420138089. The energy device stores electric energy in the form of sensible heat in a single tank, and then uses the immersion heat exchanger to realize the release of heat energy, which saves cost and space compared with the double-tank heat storage system

This patent utilizes sensible heat storage and increases thermal insulation partitions to achieve better energy storage and energy release effects, but the stability of the outlet temperature of the heat release of a single tank is poor, waste heat cannot be effectively utilized, and the efficiency of heat energy utilization is low

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