Metallic non-premixed gas-burner with counter-rotation of gases

Claim 1

A metallic gas-burner with high-velocity gas outflow allowing a high temperature of the burnt gases to be obtained, of the type comprising a central fire-tube comprising a rear portion closed by a rear wall, and a front portion on both sides of a medial transverse plane, said fire-tube constituting a mixing and combustion chamber into which is admitted, on the one hand, a fuel-gas and, on the other hand a gaseous combustion agent usually air, from an annular space constituting an air box provided between the outer wall of the said fire-tube and an external tube surrounding it, the said burner being provided at its front end portion with a front plate closing the said air-box, wherein the fuel gas is supplied at a low pressure, e.g. on the order of a few tens of millibars, into the rear of the fire-tube by a fuel-gas intake and the gaseous combustion agent is distributed at a low pressure into the said fire-tube in the form of at least essentially three main flows from the rear to the front of the said tube, the intake of the first flow being provided in a transverse plane close to the rear wall of the said fire-tube, the intakes of the second and third flows being provided in counter-rotation relationship with respect to one another, the second flow being fed into the rear portion of the fire-tube and the said third flow being fed into its front portion beyond the said medial transverse plane respectively.