System and method for the crossflow exchange of heat between a fluid and heat storage particles

Abstract

The present invention relates to a system and a method for exchanging heat between a fluid (F) and heat storage particles (3). The exchange system comprises an exchange zone (2) in which the fluid (F) and the heat storage particles in a fluidized bed flow as a countercurrent flow and a cross flow. The invention also relates to a compressed gas energy storage and restoration system and method using the heat exchange system.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Reference is made to French Patent Application no. 15 / 61.932 filed Dec. 7, 2015, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The present invention relates to heat exchange systems and particularly to storage of heat in a system or method of the AA-CAES (Advanced Adiabatic-Compressed Air Energy Storage) type.[0004]Description of the Prior Art[0005]In a compressed air energy storage (CAES) system, the energy, which is to be used at some other time, is stored in the form of compressed air. For storage, energy, notably electrical energy drives air compressors, and for release, the compressed air drives turbines, which may be connected to an electric generator. The efficiency of this solution is suboptimal because some of the energy of the compressed air is in the form of heat which is not used. Specifically, in CAES methods, only the mechanical energy of the air is use...

AI Technical Summary

Benefits of technology

[0014]In order to alleviate these disadvantages, the present invention relates to a system for exchanging heat between a fluid and heat storage particles. The exchange system comprises an exchange zone in which the fluid and the heat storage particles (in the form of a fluidized bed) flow as a countercurrent flow and a cross flow. This countercurrent and cross-flow flow pattern allows the exchange of heat between the fluid and the particles to be highly effective.

Problems solved by technology

However, this type of system requires a special storage system that is bulky and expensive (adiabatic storage).AACAES (Advanced Adiabatic Compressed Air Energy Storage) in which the air is stored at ambient temperature and the heat due to the compression is also stored, separately, in a heat storage system TES (Thermal Energy Storage).

However, these exchanges of heat are suboptimal in terms of efficiency.

However, that solution also entails a heat exchanger passing through the fluidized bed, which does not allow the exchange of heat to be optimized notably because the exchange is indirect and because not all of the particles are in contact with the fluid.

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