Combustion apparatus

A combustion apparatus comprising:

• at least one main burner port for jetting and burning a thin mixture of a fuel gas;
• at least one auxiliary burner port disposed adjacent to the main burner port so as to jet and burn a thick mixture of the fuel gas that is thicker therein than in the thin mixture;
• an air intake for introduction of air or the thin gas mixture;
• a fuel intake for introduction of the air and the thick gas mixture;
• a thin gas passage connected to both the air intake and the main burner port in fluid communication therewith, so as to supply the main burner port with the gas mixture;
• a thick gas passage connected to both the fuel intake and the auxiliary burner port in fluid communication therewith, so as to supply the auxiliary burner port with the gas mixture;
• a blending station for intermixing the air with the thick gas mixture delivered from the fuel intake;
• the thick gas passage having an expanded section and a constricted section, with the expanded section supplying the auxiliary burner port with the thick gas mixture;
• and
• the constricted section intervening between the blending station and the expanded section,
• whereby a part of the thick gas mixture flows from the blending station into the thin gas passage in order to form the thin gas mixture blown out through the main burner port, with the remainder of the thick gas mixture passing through the blending station and the constricted section so as to remain thick until blown out of the auxiliary burner port.

A combustion apparatus comprising:

• at least one main burner port for jetting and burning a thin mixture of a fuel gas;
• at least one auxiliary burner port for jetting and burning a thick mixture of the fuel gas that is thicker therein than in the thin mixture;
• an air intake for introduction of air or the thin gas mixture;
• a fuel intake for introduction of the air and the thick gas mixture;
• a thin gas passage connected to both the air intake and the main burner port in fluid communication therewith so as to supply the main burner port with the gas, the thin gas passage having at least one supplementary gas opening formed therein;
• a thick gas passage connected to both the fuel intake and the auxiliary burner port in fluid communication therewith, so as to supply the auxiliary burner port with the gas mixture;
• a blending station for intermixing the air with the thick gas mixture delivered from the fuel intake, formed by reducing the cross-sectional area of the thick gas passage gradually towards its downstream end from the fuel intake;
• and
• a branching station for directing a part of thick gas mixture to the thin gas passage,
• whereby a part of the thick gas mixture flows from the blending station through the supplementary gas openings and into the thin gas passage in order to form the thin gas mixture blown out through the main burner port, with the remainder of the thick gas mixture passing through the blending station so as to remain thick until blown out of the auxiliary burner port.