Salt-melting heat-storing warehouse

Abstract

The invention provides a salt-melting heat-storing warehouse, relating to a solar heat power-generation and heat-storage system. A closed system consists of low-temperature storage tank equipment, high-temperature storage tank equipment, a heat exchanging system, a nitrogen pipeline system and a liquid salt-melting pipeline. The salt-melting heat-storing warehouse is characterized in that the nitrogen pipeline system comprises a nitrogen pipeline and a nitrogen storage tank; the nitrogen pipeline is communicated with the low-temperature storage tank equipment, the high-temperature storage tank equipment and the liquid salt-melting pipeline; the heat exchanging system is connected with the low-temperature storage tank equipment and the high-temperature storage tank equipment respectively by the liquid salt-melting pipeline; the low-temperature storage tank equipment comprises a low-temperature storage tank; the high-temperature storage tank equipment comprises a high-temperature storage tank; one end of the liquid salt-melting pipeline is arranged in the low-temperature storage tank and the other end of the liquid salt-melting pipeline is arranged in the high-temperature storage tank. When the salt-melting heat-storing warehouse is used for storing heat, the temperature of the melted salt is heated to 386 DEG C; during the heat discharging, the melted salt of the system is cooled to the temperature of about 292 DEG C; under both the heat-storing condition and the heat-discharging condition, the melted salt is in liquid state; the cold salt and the hot salt are stored in independent tanks respectively; and the heat storage system with the independent cold tank and heat tank has the advantages that both the heat storage and the heat discharging can occur at constant temperature.

Description

technical field [0001] The invention relates to a heat storage system for solar thermal power generation, in particular to a molten salt heat storage store. Background technique [0002] The parabolic trough system in solar thermal power generation is currently the most mature and widely used solar thermal power generation technology. A traditional steam turbine power plant. The concentrating reflector tank is made of surface-treated metal sheets, and the single-axis solar tracking system ensures that 80 to 100 times the concentrated sunlight can be accurately reflected onto the heat-absorbing tube, and the synthetic oil flowing in the tube is heated to 400°C At high temperatures (higher temperatures can be reached with new media such as molten salt), the high-temperature thermal oil is sent to a heat exchanger where it generates steam to drive a conventional turbine generator. There is another important component in some newer trough CSP plants: the heat storage tank. It...

AI Technical Summary

Problems solved by technology

Since the heat medium synthetic oil mainly used in the current trough CSP power station can only be heated to 400°C, and the quality of the steam generated at this temperature is average, which limits the operating efficiency of the rear-end generator set, thus making the annual power generation of the entire power station Efficiency can only reach 14% to 16%

Images