Method for burning a liquid or gaseous fuel in a boiler, boiler for carrying out the method and thermal bath having a boiler

A condensing or condensing combi boiler using a blue flame burner, comprising:

• a boiler housing with an inlet for combustion air and an outlet for combustion gases;
• a cylindrical heat exchanger arranged in the boiler housing, with a slot-like pass-through openings for the combustion gases;
• a flame tube arranged in the cylindrical heat exchanger so that a jacket-shaped intermediate space is defined between the flame tube and the cylindrical heat exchanger;
• ignition electrodes extending into the flame tube for the ignition of the fuel-air-gas mixture;
• a baffle plate with a faceplate arranged in the flame tube, through which face plate the combustion air is fed into the flame tube;
• a nozzle unit with a nozzle for atomization of the fuel;
• a flame-deflecting part arranged at an axial distance from the flame tube, wherein the jacket-shaped intermediate space in the flame tube and the space between the flame tube and deflecting part define a combustion chamber;
• and
• a blower connected to the boiler housing for generating a blower pressure, the blower configured to generate a blower pressure that when the burner is at full load, a differential pressure zone is generated with a differential pressure of at least 0.25 mbar compared to a pressure in the combustion chamber between the flame tube and the heat exchanger in a region of the slot-like pass-through openings.

A condensing or condensing combi boiler with a blue flame burner, comprising:

• a boiler housing with an inlet for combustion air and an outlet for the combustion gases;
• a cylindrical heat exchanger arranged in the boiler housing with a slot-like pass-through openings for combustion gases;
• a flame tube arranged in the cylindrical heat exchanger so that a jacket-shaped intermediate space is defined between the flame tube and the heat exchanger, a casing of the flame tube defining an opening configured for feedthrough of ignition electrodes;
• a baffle plate with faceplate arranged in the flame tube, through which face plate combustion air is fed into the flame tube;
• a nozzle unit with a nozzle for atomization fuel;
• a flame-deflecting part arranged at an axial distance from the flame tube, wherein the intermediate space in the flame tube and a space between the flame tube and the flame-deflecting part defines a combustion chamber;
• and
• a blower connected to the boiler housing for generating a blower pressure.

A condensing or condensing combi boiler with a blue flame burner, comprising:

• a boiler housing with an inlet for combustion air and an outlet for the combustion gases;
• a cylindrical heat exchanger arranged in the boiler housing, with a slot-like pass-through openings for combustion gases;
• a nozzle unit having a nozzle for atomization fuel;
• a flame-deflecting part arranged at an axial distance from a flame tube, wherein a first space in the flame tube and a second space between the flame tube and deflecting part define a combustion chamber;
• a blower connected to the boiler housing for generating a blower pressure;
• a burner housing defining an inflow chamber;
• and
• a strainer insert in the burner housing for air calming.