Once-through evaporator for a steam generator

Details Once-through evaporator for a steam generator Once-through evaporator for a steam generator

F - Mech Eng,Light,Heat,Weapons

22

B

F22B 15/00 (2006.01) F22B 1/18 (2006.01) F22B 29/06 (2006.01) F22B 37/18 (2006.01)

Patent

CA 2501086

A steam generator (A) has a once-through evaporator (14) which converts liquid water into steam in tubes (30) over which hot gases flow. Each tube contains a metal tape (40) which is twisted into a helical configuration to induce turbulence in the mist produced by the boiling, and the turbulence insures that the mist wets the inside surfaces of the tubes, thus producing good heat transfer and moderate temperatures in the tubes.

La présente invention concerne un générateur de vapeur (A) comprenant un évaporateur à passage unique (14) qui transforme de l'eau liquide en vapeur dans des tubes (30) sur lesquels circulent des gaz chauds. Chaque tube contient une bande métallique (40) qui est torsadée selon une configuration hélicoïdale afin d'induire une turbulence dans la brume produite par l'ébullition. Cette turbulence assure que la brume humidifie les surfaces internes des tubes, ce qui induit un bon transfert de chaleur et modère la température dans les tubes.

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