Reversal-combustion type numerical control heating boiler with three return stroke smoke evacuation channel

The utility model discloses a reversal-combustion type numerical control heating boiler with a three-return-stroke smoke evacuation channel. The reversal-combustion type numerical control heating boiler comprises a boiler body, a blower fan and a control panel, the interior of the boiler body is divided into four chambers by water jacket partition boards, the four chambers are a combustion chamber, a main combustion chamber, an accessory combustion chamber and a smoke evacuation channel, the combustion chamber and the accessory combustion chamber are arranged side by side, a water pipe fire grate is arranged under the combustion chamber and the accessory combustion chamber, the main combustion chamber is arranged under the water pipe fire grate, the smoke evacuation channel comprises an upgoing channel, a downgoing channel and a tail smoke channel, which are arranged side by side, the upgoing channel is communicated with the upper end of the downgoing channel, the downgoing channel is communicated with the lower end of the tail smoke channel, the three-return-stroke smoke evacuation channel is formed by the upgoing channel, a downgoing channel and a tail smoke channel, the gap between the upgoing channel and the accessory combustion chamber is sealed, and the lower end of the upgoing channel is communicated with the main combustion chamber. Heat of the smoke can be effectively absorbed by the boiler, the impurity content of the smoke is lowered, the pollutant discharging quantity is lowered, by means of the structural improvement of an air inlet and an air outlet, the intelligent energy conservation control is achieved.