Stepped heat supply system for energy storage through electric heating of molten salt

Abstract

The invention discloses a stepped heat supply system for energy storage through electric heating of molten salt. The system comprises a low-temperature salt storage tank (1), a low-temperature molten salt pump (2), a molten salt electric heating furnace (3), a high-temperature molten salt tank (4), a high-temperature molten salt pump (5), a molten salt steam generator (6), an industrial steam equipment (7), a heat exchanger (8), a condensation water pump (9), a deaerator (10), a water feeding pump (11), a radiator (12) and a circulating water pump (13). The molten salt electric heating furnace (3) uses low-valley-period electric power or photovoltaic power, wind power and the like to heat molten salt for energy storage, steam production and industrial production; and medium-temperature waste steam exhausted in the industrial production is used for heating circulating water for user warming, so that full energy utilization is realized. The system adopts the molten salt as a heat transmission and heat accumulation medium, has such advantages as stable heat transmission and heat accumulation, low system pressure, higher heat efficiency, safety and reliability, and is simple in equipment, small in floor area, low in cost and suitable for large-scale promotion and application.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a molten salt energy storage heating system, in particular to a cascade heating system for electric heating of molten salt energy storage. Background technique [0002] At present, coal-fired boilers are mainly used for heating in most areas of my country. If environmental protection measures such as desulfurization, denitrification and dust removal are not adopted during the operation of coal-fired boilers, the pollutants produced will be discharged into the atmosphere, polluting the atmospheric environment and endangering public health. In recent years, after my country entered the heating period in winter, haze weather occurred frequently, seriously affecting people's normal life. In order to improve the ambient air quality, the State Council of my country and the relevant departments of various provinces and cities have issued action plans and implementation plans for a...

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Problems solved by technology

[0005] In order to solve the problem of low thermal efficiency caused by the solid heat storage material can only be used as a heat storage medium but not a heat transfer medium in the "coal to electricity" central heating project mentioned in the background technology and the working temperature of liquid heat transfer oil exceeds 400 ℃ will decompose, and there are problems such as short service life and high price. The present invention provides a cascade heating system for electric heating of molten salt energy storage. The molten salt has a wide range of operating temperatures, low steam pressure, large heat capacity, With the advantages of low viscosity, good chemical stability, cheap price, environmental protection and no pollution, the molten salt energy storage system has the advantages of safety, reliability and low investment cost.

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