F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
F22B 29/06 (2006.01) F22B 37/14 (2006.01)
Patent
CA 2241877
Once-through steam generator having spirally arranged evaporator tubes The invention relates to a once-through steam generator (2) having a gas flue which is formed from steam generator tubes (10) welded to one another in a gas-tight manner via fins (13) and the steam generator tubes (10) of which are connected in parallel for the throughflow of a flow medium, have on their inside a surface structure for generating a high flow turbulence in the medium flowing through them and are arranged approximately in a spiral coil in a firing region (V) of the gas flue. So that a once-through steam generator (2) of this type can also be operated in low load states of, for example, about 20% of the design load, without excessive thermal stresses occurring, according to the invention the steam generator tubes (10) of the once-through steam generator (2) are designed in such a way that, when they are in operation, the geodetic pressure loss of the medium flowing through it is at least 0.5 times its pressure loss due to friction.
Cet évaporateur en continu (2) comprend un carneau de gaz formé de tubes évaporateurs (10) soudés les uns aux autres de manière étanche au gaz au moyen de parties jointives (13). Les tubes évaporateurs (10) sont connectés en parallèle pour laisser passer un milieu en écoulement et présentent sur leur face intérieure une structure superficielle qui génère une grande turbulence d'écoulement dans le milieu en écoulement. Ces tubes évaporateurs se situent dans la zone de combustion (V) du carneau de gaz à peu près dans un enroulement en spirale. Afin de pouvoir exploiter de tels évaporateurs en continu (2) même sous des charges réduites équivalant par exemple à environ 20 % de la charge prévue, sans que des contraintes thermiques excessives ne se produisent, les tubes évaporateurs (10) de l'évaporateur en continu (2) sont conçus de sorte que pendant leur exploitation, la perte de pression géodésique du milieu qui les traverse s'élève à au moins 0,5 fois ses pertes de pression par friction.
Kral Rudolf
Wittchow Eberhard
Aktiengesellschaft Siemens
Smart & Biggar
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