GAS TURBINE COMBUSTION CHAMBER Russian patent published in 1998 - IPC

FIELD: power plants working mainly on compressed natural gas at low concentration of nitric oxides in turbine waste gases. SUBSTANCE: gas turbine combustion chamber includes at least one flame tube consisting of main chamber and prechamber with fuel gas supply cavity and fuel gas and air mixing cavity, as well as injectors with bushes mixing fuel gas and air. Front and rear walls of prechamber are made in form of two layers with fuel gas supply cavities. Rear wall of prechamber has shield directed towards main chamber forming flow-through air cavity together with adjacent wall. Cross section of fuel gas supply cavity at prechamber outlet exceeds cross-section of prechamber. Walls of bushes and prechamber have slotted passages intersecting tangentially with axis of bushes and prechamber. Holes provided between passages are brought in communication with fuel gas supply cavities; they have row of smaller holes whose outlet is located on surface of slotted passages. Diameters of front and outlet ends of mixing bushes are reducing relative to center portion of bush; bushes have taper bodies inside them; vertex of cone is directed in way of flow; base of cone is fastened to front end of bush; body of cone has hole coaxial relative to axis of bush. EFFECT: increased service life of combustion chamber. 2 cl, 6 dwg