Fossil-fired continuous-flow steam generator

Details Fossil-fired continuous-flow steam generator Fossil-fired continuous-flow steam generator

F - Mech Eng,Light,Heat,Weapons

22

B

F22B 21/34 (2006.01)

Patent

CA 2355101

The invention rotates to a fossil fuel fired continu- ous-flow steam generator (2) with a gas turbine combustion chamber (4) for fossil combustibles (B). On the heating gas side a vertical gas extractor (8) is mounted downstream of the horizontal gas extractor (6). The walls (9) surrounding the combustion chamber (4) are composed of evaporator tubes (10) which are welded together and vertically arranged. The aim of the invention is to provide a continuous-flow steam generator (2) which is especially easy to produce and assemble. During operation of the continuous-flow steam generator the tempera- ture differences between adjacent evaporator tubes (10) of the combustion chamber (4) shall be kept as low as possible. To this end, the continuous-flow steam generator (2) is provided with a number of burners (30) which are arranged in the com- bustion chamber (4) at the level of the horizontal gas extractor (6). Also, for a number of evaporator tubes (10) which can be simultaneously impinged by the flow medium (S) the quotient from the steam generating capacity M (indicated in kg/s) at full load and from the sum A (indicated in m2) of the inner cross-sectional surfaces of said evaporator tubes (10) impinged simultaneously by the flow medium (S) is less than 1350 (unit kg/sm2).

L'invention concerne un générateur de vapeur continu (2) comprenant une chambre de combustion (4) pour combustible fossile (B) en aval de laquelle est monté un carneau vertical (8) côté gaz de chauffage, par l'intermédiaire d'un carneau horizontal (6). Les parois (9) qui entourent la chambre de combustion (4) sont formées de tubes de vaporisation (10) verticaux, soudés les uns aux autres, de manière étanche aux gaz. L'invention vise à mettre au point un générateur de vapeur continu (2) ne requérant qu'une complexité technique réduite en termes de production et de montage. De plus, lorsque ledit générateur de vapeur continu est en service, les différences de températures entre des tubes de vaporisation (10) adjacents de la chambre de combustion (4) doivent être maintenues aussi réduites que possible. A cet effet, le générateur de vapeur continu (2) comporte un nombre de brûleurs (30) disposés dans la chambre de combustion (4) à hauteur du carneau horizontal (6). En outre, le quotient formé pour un nombre de tubes de vaporisation (10) pouvant être sollicités en parallèle par un milieu d'écoulement (S), sur la base du débit de vapeur (M) (exprimé en kg/s) en pleine charge et sur la base de la somme (A) (exprimée en m<2>) des surfaces de section transversale intérieure de ces tubes d'évaporation (10) pouvant être sollicités en parallèle par un milieu d'écoulement (S), est inférieur à 1350.

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