Vaporizing burner

In a vaporizing burner, including an inlet chamber for admixing an at least partially vaporized liquid fuel with primary air;

• catalyzer means communicating with said inlet chamber for converting said vapor-air mixture into a fuel gas;
• a mixing chamber adjoining said catalyzer means for admixing said fuel gas with secondary air;
• and annular chamber concentrically encompassing said inlet chamber, said catalyzer means and said mixing chamber, including an annular wall separating said inlet chamber from said annular chamber;
• a conically widening chamber for receiving the fuel gas-air mixture from said mixing chamber;
• and an apertured burner plate of a porous material closing off said widening chamber, the improvement comprising;
• an antechamber arranged ahead of said inlet chamber, an annular passageway completely surrounding said inlet chamber and encompassing said annular chamber and said catalyzer means for at least a portion of their lengths, said antechamber including a transition into said annular passageway;
• a first heat source in said annular passageway for the vaporization of said fuel;
• a second heat source in said annular chamber for preheating of the primary air during burner start-up and for support during load changes, radial passageways in said annular wall for communicating said annular chamber with said inlet chamber;
• first and second homogenizing means being arranged in, respectively, said inlet chamber and in said mixing chamber;
• and an ignition chamber being positioned intermediate said conically widening chamber and said mixing chamber, said ignition chamber being separated from said mixing chamber so as to prevent backfiring of the ignited fuel gas.