Handheld burning device

A handheld burning device, comprising:

• a diversion mechanism having a flow channel therein, wherein the diversion mechanism is configured to be detachably connected to a fuel tank for allowing one end of the flow channel to be in spatial communication with the fuel tank;
• a nozzle connected to the diversion mechanism and being in spatial communication with another end of the flow channel, wherein an outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm;
• a mixing inner tube having two ends that are respectively defined as a first end and a second end, wherein the first end is arranged adjacent to the outlet of the nozzle, and wherein an inner diameter of the mixing inner tube is within a range from 28 times to 33 times of the aperture, and a length of the mixing inner tube is within a range from 60 mm to 100 mm;
• an ignition mechanism having an ignition end and a manipulation end, wherein the ignition end is arranged adjacent to the second end of the mixing inner tube, and the manipulation end is arranged away from the second end of the mixing inner tube;
• and
• a metal outer tube sleeved around the mixing inner tube, wherein the second end of the mixing inner tube is arranged in the metal tube, and wherein a length of the metal outer tube is greater than the length of the mixing inner tube and is within a range from 90 mm to 140 mm.