Fire tube type evaporator

The utility model relates to the technical field of kitchen equipment, and particularly discloses a fire tube type evaporator which comprises a shell and fire tubes arranged in the shell, a water inlet is formed in the lower portion of the shell, a steam opening is formed in the upper end of the shell, and the multiple groups of fire tubes are arranged in parallel. Each group of fire tubes comprises a plurality of sections of radiating tubes and connecting tubes which are arranged in parallel from top to bottom; every two adjacent radiating pipes are connected through a connecting pipe. Compared with the prior art, due to the fact that the multiple sections of radiating pipes are arranged in parallel from top to bottom, the heat exchange area is increased in a limited space, and the heat transfer efficiency is improved; in the temperature decreasing process, the flue gas is in full contact with the water through the fire tube from bottom to top in sequence, the temperature drop of the flue gas is fully utiliz