Once-through evaporator

Details Once-through evaporator Once-through evaporator

F - Mech Eng,Light,Heat,Weapons

22

B

F22B 29/06 (2006.01) F01K 23/10 (2006.01) F22B 21/02 (2006.01) F22B 37/62 (2006.01)

Patent

CA 2754669

The invention relates to a method for designing a once-through evaporator (1) for a horizontally constructed waste heat steam generator (2) with a first evaporator heating surface (8) which incorporates a number of first steam generation tubes (13), the arrangement of which is essentially vertical and through which the flow is from the bottom to the top, and another second evaporator heating surface (10), which on the flow substance side is connected downstream from the first evaporator heating surface (8), which incorporates a further number of second steam generation tubes (14) the arrangement of which is essentially vertical and through which the flow is from the bottom to the top. The aim of the invention is to produce a once-through evaporator which is simple to construct and which has a long service life. For this purpose, a minimum mass flow density is prescribed and the second steam generation tubes (14) are designed in such a way that the mean mass flow density which is established in the second steam generation tubes (14) when operating at full load does not fall below the prescribed minimum mass flow density.

L'invention concerne un évaporateur continu (1) pour un générateur de vapeur à chaleur perdue (2) de structure couchée, qui comprend une première surface chauffante d'évaporateur (8) présentant un certain nombre de premiers tuyaux générateurs de vapeur (13) disposés essentiellement verticalement, parcourus de bas en haut par un milieu d'écoulement, ainsi qu'une seconde surface chauffante d'évaporateur (10) montée en aval de la première surface chauffante d'évaporateur (8) côté milieu d'écoulement. Cette seconde surface chauffante d'évaporateur comprend un certain nombre de seconds tuyaux générateurs de vapeur (14) disposés essentiellement verticalement et parcourus de bas en haut par un milieu d'écoulement. L'invention vise à mettre au point un évaporateur continu présentant une durée de vie particulièrement élevée et une conception particulièrement simple. A cet effet, les seconds tuyaux générateurs de vapeur (14) sont conçus de sorte que la densité moyenne du débit massique qui s'instaure en mode à plein rendement ne passe pas en dessous d'une densité minimale de débit massique dans les seconds tuyaux générateurs de vapeur (13).

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