Pulsed tube bundle heat exchange assembly and fused salt heat storage tank thereof

Abstract

The invention provides a pulsed tube bundle heat exchange assembly and a fused salt heat storage tank thereof. The pulsed tube bundle heat exchange assembly comprises coiled tubes, an inlet vertical tube and an outlet vertical tube. The multiple coiled tubes are arranged. Each coiled tube comprises multiple arc heat exchange tubes. The ends of the adjacent heat exchange tubes are communicated, andthe multiple heat exchange tubes form a series-connection structure. A heat exchange tube free end is formed at the end of each heat exchange tube. The inlet vertical tube is connected with an inletof the first heat exchange tube, and the outlet vertical tube is connected with an outlet of the last heat exchange tube. The inlet vertical tube is connected with the inlet of the first heat exchangetub through a pulsed tube. An inlet of the inlet vertical tube is connected with a pulsating flow generation device. The pulsating flow generation device is used for generating pulsating flow in theheat exchange tubes. Pulsating flow is designed in the heat exchange tubes, the heat exchange efficiency can be further improved, the convection heat transfer process outside and inside the tubes canbe enhanced, the time needed for fused salt heat storage can be shortened, and meanwhile the effect of descaling in the tubes can be achieved.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers, in particular to a pulsating tube bundle heat exchange component and a molten salt heat storage tank thereof. Background technique [0002] Shell-and-tube heat exchangers are widely used in energy, power, petrochemical and other industrial fields. The enhanced heat transfer technology of heat exchangers is of great significance to energy saving and consumption reduction. Among them, passive enhanced heat transfer technology is an important research direction at present because it does not require external high-quality energy input to achieve the purpose of enhanced heat transfer. [0003] The use of fluid-induced vibration of heat transfer elements to achieve enhanced heat transfer is a form of passive enhanced heat transfer, which can transform the strict prevention of fluid vibration induction in the heat exchanger into the effective use of vibration, so that the transmission elements c...

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Problems solved by technology

However, this kind of heat storage tank has problems such as large volume, high consumption of molten salt, uneven heating of electric heating or high-temperature fluid, and long heat storage time of molten salt.

Although the surface heat transfer coefficient corresponding to the heat transfer process of liquid molten salt is not much different from the convective heat transfer characteristics of water, in the molten salt tank, the heat storage of molten salt is realized by heat conduction and natural convection, and there must be storage The thermal process takes a long time, and the heat storage speed is slow, etc.

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