Abstract:
A vapor generator organization for producing superheated vapor wherein a tube bundle is immersed in a heating medium consisting of high temperature liquid metal or molten salts. The tube bundle comprises a plurality of pressure tubes, each one having inserted therewithin, for a length less than the overall pressure tube length, a bayonet tube arrangement. Vaporizable liquid is passed through each bayonet tube arrangement to be vaporized by steam flowing in the annulus formed between the bayonet tube arrangement and its respective pressure tube. The portion of the annulus surrounding the bayonet tube arrangement acts as a low temperature superheater section in which the steam is superheated to a temperature intermediate the temperature of the heating medium and the saturation temperature of the vaporizable liquid, the steam serving as an intermediate heating medium between the primary heating medium and the vaporizing liquid. Additional superheating of the vapor to the final temperature takes place within the pressure tubes over that portion of the length thereof in which the respective bayonet tube arrangements do not extend.