Device for cooling heat transfer solid for precisely controlling the temperature, said device optionally being associated with an endothermic or exothermic process

A device for exchanging heat for a heat transfer solid in the fluidized state in order to carry out a controlled exchange of heat from a heat transfer solid used in an endothermic or exothermic process having at least one reaction zone, said device consisting of an exchange bundle immersed in a fluidized bed of solid, said fluidized bed being contained in a vessel (2) communicating with the reaction zone via at least one conduit for introducing solid (4), and said exchange bundle being constituted by an assembly of longitudinal tubes grouped into fours, a bayonet type tube (8)/(9) comprising a central tube (9) and a tube (8) coaxial with the tube (9) and surrounding it, and three tubes (10) parallel to the tube (8)/(9) and disposed symmetrically about said bayonet tube (8)/(9) in order to form, in top view, a symmetrical assembly in the form of a trefoil, termed the exchange bundle module.