Combustion chamber

A burner comprising a combustion chamber, a first cooling pipe, and a second cooling pipe, wherein the combustion chamber comprises:

• a gas inlet for providing a mixed gas to the combustion chamber, an ignition device, and a grate structure, wherein
• the grate structure comprises a first set of tubes and a second set of tubes proximal to the first set of tubes, wherein the first set of tubes are arranged to form first set of apertures between each of the first set of tubes, the second set of tubes are arranged to form second set of apertures between each of the second set of tubes, wherein the first set of apertures and the second set of apertures are arranged in intervals along flow direction of the mixed gas;
• the mixed gas from the gas inlet flows through the first set of apertures and the second set of apertures, and is ignited after flowing through the second set of apertures to form flames in the combustion chamber;
• each of the second set of tubes forms a blunt body configured to generate a negative pressure zone in the combustion chamber after the second set of apertures and to prevent backfire;
• wherein:
• the first cooling pipe is in fluid communication with the first set of tubes and the second set of tubes at a distal end of the burner;
• the second cooling pipe is in fluid communication with the first set of tubes and the second set of tubes at a proximal end of the burner;
• and
• each of the second set of tubes is aligned with one of the first set of apertures and is configured to split the mixed gas passing through one of the first set of apertures.