A discharging device and a method for an energy storage system

Abstract

A discharging device utilizes solid particles (5), for example sand particles, which are heated by the electric power from the renewable energy power plant. The solid particles (5) are fluidized by gas from a static solid–like state to a dynamic fluid–like state. The discharging device has multiple adjacent heat transfer modules (11 – 18), which are each partially separated by a module wall (21 - 27). The module wall (21 - 27) between adjacent heat transfer modules has an opening (31 – 34) in the module wall (21 - 27) to allow the fluidized solid particles (5) to travel to adjacent heat transfer module (11 – 18). The fluidized solid particles (5) travel horizontally from the particle inlet via adjacent heat transfer modules (11 – 18) and through said opening (31 - 34) to the particle outlet (59) of the last heat transfer module (14, 15, 18).