The device is constituted by an assembly produced in the form mecano - soudee comprising a reservoir6, containing cooling water, a set of distribution and exchange thermique15 fixed to the inside of the reservoir6 moyen30 and a, 31 of the supply of water at reservoir6 to replace the water of this reservoir6 vaporised in contact with the tubes24 of the dispensing assembly and echange15. The fluid in contact with the surface of the tubes24 is constituted by a two-phase mixture of water and steam constantly renewed, for the circulation of steam under pressure in the tubes24.
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