METHOD AND DEVICE FOR BURNING FUEL-AIR MIXTURE Russian patent published in 1997 - IPC

FIELD: power engineering; gas-turbine plants burning liquid or gaseous fuel mixed wit air. SUBSTANCE: method involves preparation of fuel-air mixture in mixing chambers with excess air factor of α = 1,02-1,05, air supply in separate backwashes to burning zone to ensure excess air factor α = 1,5-2,0, mixing of combustion products with air at distance of 5-8 passes of the diameter of mixing chamber outlet section from its outlet edge. Device implementing this method has combustion chamber 1 and burner with mixing chamber 4, as well as disk 9 placed around mixing chamber 4 and provided with axial holes 5 to pass air to combustion chamber; mixing chamber 4 has diffuser 6 with cylindrical nozzle 7 for fuel supply coaxially arranged at its inlet; total areas of flow sections for conveying air through mixing chambers /f_m/ and disk holes /F_h/, as well as for fuel passing through nozzles /F_n/ are related as F_m/F_n≅0,9•K_m(ρ_f/ρ_a) 0,7≅F_h/F_m≅1,7, where ρ_a,ρ_f is air density at mixing chamber inlet and fuel density at nozzle outlet, respectively; K_m is mass proportion of air and fuel at α = 1,05. EFFECT: enlarged functional capabilities. 2 cl, 2 dwg