Molten salt storage tank heat exchange system

Abstract

The invention discloses a molten salt storage tank heat exchange system. The system includes a molten salt storage tank, a heater, a circulating fan, an airway, an air outlet pipe, air holes and self-opening-closing devices; the circulating fan is arranged outside the storage tank; the inlet of the circulating fan communicates with the internal of the storage tank; the outlet of the circulating fan is connected to the heater; one end of the heater is connected to the circulating fan, and the other end of the heater is connected to the airway; the airway is connected to the air outlet pipe; theair holes are arranged in the air outlet pipe; and the self-opening-closing devices are arranged outside the air outlet pipe and can automatically make the air holes to open or close. Through the system, the self-opening-closing devices can effectively solve the problems of energy loss caused by short circuit phenomenon that, when partial air holes are immersed by molten salt in the storage tank,large amount of hot air used for cyclic heating directly returns to the circulating fan for the next cycle after overflowing through the air holes that are not immersed and does not take part in theheating on the molten salt in the storage tank.

Description

technical field [0001] The invention belongs to the field of molten salt heat storage, and in particular relates to a molten salt storage tank heat exchange system. Background technique [0002] As a clean energy storage medium, molten salt is being more and more widely used in solar thermal power generation, clean heating and other fields. The molten salt storage tank is the core device of the molten salt energy storage system. When the molten salt energy storage system is put into operation for the first time, before the molten salt is introduced into the storage tank, the air in the tank and the tank body need to be preheated to reduce thermal fusion. The temperature difference of the salt entering the storage tank avoids unfavorable phenomena such as deformation of the tank due to uneven stress of the tank caused by hot molten salt entering the tank, and ensures the smooth progress of the salt feeding process. [0003] In addition, the molten salt needs to maintain a ce...

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Problems solved by technology

[0004] In addition, the molten salt heat storage system has been out of service for a long time, and when it is put into operation again, it is necessary to supply heat to the solidified or viscous molten salt medium in the tank to liquefy it. The traditional solution uses electric heating rods to heat the molten salt in the storage tank. Salt medium heating, this method needs to arrange a large number of heating rods and cables; and the heating device needs to be installed on the tank wall, and its layout structure is complex, which has a great impact on the design of the storage tank. After the layout, there are many welds and great leakage risks; The heating range of the electric heating rod is limited by the layout coverage and insertion depth; the heating device of the electric heating rod also has various defects such as short life and difficult replacement.

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