Abstract Heat exchanger for producing steam mainly formed by a casing in which a bundle of steam tubes is provided, attached between tube sheets and inside of which casing liquid metal such as sodium flows around these tubes as a heat-transferring medium, the transition area from tubes to tube sheet in this casing being provided with a thermal barrier to reduce the heat transfer from the sodium to the tube sheet and to the tubes near their attachment to the tube sheet, this thermal barrier being formed by a number of tubular spaces enclosing one or more tubes of the tube bundle along a part of their length(s) which tubular spaces are formed by a number of baffles together forming a grid and are closed on the one side by the tube sheet and on the other side are in open connection with the inner space of the rest of the heat exchanger casing.
A heat exchanger for producing steam and operating with liquid metal as a heat-transferring medium comprising a plurality of water or steam tubes attached between two tube sheets, a casing enclosing said plurality of tubes and in which liquid metal flows around said tubes and a thermal barrier means in the transition area from tubes to tube sheets to reduce heat transfer to the tube sheets and the tubes near their attachment to the tube sheets, said thermal barrier means comprising a plurality of tubular spaces with their walls parallel to the tube walls and enclosing one or more of the tubes along a portion of their length, which spaces are closed on the one side by the tube sheet and on the other side are in open connection with the inner space of the heat exchanger.
Claim 2
Dependent Claim
137 words
A heat exchanger for producing steam and operating with liquid metal as a heat-transferring medium comprising a plurality of water or steam tubes attached between two tube sheets, a casing enclosing said plurality of tubes and in which liquid metal flows around said tubes and a thermal barrier means in the transition area from tubes to tube sheets to reduce heat transfer to the tube sheets and the tubes near their attachment to the tube sheets, said thermal barrier means comprising a plurality of tubular spaces with their walls parallel to the tube walls and enclosing one or more of the tubes along a portion of their length, which spaces are closed on the one side by the tube sheet and on the other side are in open connection with the inner space of the heat exchanger.
Claim 3
Dependent Claim
31 words
A heat exchanger according to claim 1, wherein the tubular spaces are formed by a number of baffles, together forming a grid, and at one side abutting to the tube sheet.
Claim 4
Dependent Claim
15 words
A heat exchanger according to claim 1, wherein each tubular space encloses an individual tube.