Improvements in the combustion and utilisation of fuel gases

F - Mech Eng,Light,Heat,Weapons – 23 – C

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F23C 7/06 (2006.01) F02C 3/22 (2006.01) F02C 7/224 (2006.01) F23D 14/62 (2006.01) F23D 14/66 (2006.01) F23R 3/00 (2006.01) F23R 3/02 (2006.01)

Patent

CA 2202767

A combustor (2) for the combustion of fuel gas is described. The fuel gas entering the combustor (2) by an inlet pipeline (20) is a compressed admixture with air of a concentration below the lower explosive limit. The fuel gas/air admixture passes within a tube (6) to pass to the combustion zone (8) where combustion occurs only by reaction/self-combustion. The combusted gas passes by a tortuous path provided by an arrangement of baffles (10) to the outlet duct (22). The exhausting combusted gas passes over the outer surface of the tube (6) and gives up preheating heat to the inlet gas therein. A gas turbine system (100) for utilising waste fuel gas also is described that includes a combustor (2, 114) as described that provides combusted fuel to the expansion stage (104) of the turbine (100).

La présente invention concerne une chambre de combustion (2) destinée à la combustion des gaz combustibles. Le gaz combustible pénétrant dans la chambre de combustion (2) par un tube d'admission (20) est un mélange comprimé à de l'air d'appoint sous une concentration inférieure à la limite minimale de l'explosion. Le mélange gaz combustible / air d'appoint passe à l'intérieur d'un tube (6) de façon à arriver dans la zone de combustion (8) où la combustion ne se produit que par phénomène de réaction / auto-inflammation. Les gaz de combustion suivent un trajet sinueux pourvu de chicanes (10) et arrivent au conduit d'évacuation (22). Le gaz de combustion s'échappant circule sur la surface extérieure du tube (6) et abandonne la chaleur de préchauffage au gaz d'admission qui s'y trouve. L'invention concerne également un système de turbine à gaz (100) utilisant le gaz combustible brûlé, et comportant ce type de chambre de combustion (2, 114) qui envoie le combustible brûlé dans l'étage de détente (104) de la turbine (100).

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