Patent ID: 7654819

Claim:
A method for controlling combustion by a tubular flame burner comprising the steps of: preparing a tubular combustion chamber having a front-end, a rear-end and an inner wall, wherein the front-end is open and for preparing a plurality of fuel-gas spraying nozzles and a plurality of oxygen-containing-gas spraying nozzles, the tubular combustion chamber having rectangular slits at the rear-end of the tubular combustion chamber, the rectangular slits being long in an axial direction and narrow in a radial direction, the fuel-spraying nozzles and oxygen-containing-gas spraying nozzles having a flat shape and being connected to the slits, wherein respective nozzle orifices of the fuel-gas spraying nozzles and the oxygen-containing-gas spraying nozzles face toward the inner wall of the combustion chamber, and wherein the fuel-gas spraying nozzles and the oxygen-containing-gas spraying nozzles of the combustion chamber are disposed along a circumferential direction; connecting supply-lines to the nozzles and for providing Switching-valves to the supply-lines; adjusting the fuel-gas spraying nozzles and the oxygen-containing-gas spraying nozzles so that each spraying is in a direction to produce a swirl of the sprayed fuel-gas and oxygen-containing-gas in the combustion chamber, to control the combustion; and controlling on/off of the switching valves, such that an initial spraying speed of the fuel gas and the oxygen-containinq-gas sprayed into the combustion chamber in accordance with a combustion load is controlled to be within a range between a maximal permissive speed (Vp) dependent upon the pressure loss and a minimal spraying speed (Vq) required for forming a tubular flame, so that the spraying speed from the nozzles is maintained within a predetermined range in accordance with the combustion load of the tubular flame burner.