Efficient and clean multi-gradient combustion device for coal and use method of efficient and clean multi-gradient combustion device

The invention relates to the technical field of efficient and clean combustion of pulverized coal and discloses an efficient and clean multi-gradient combustion device for the coal and a use method of the efficient and clean multi-gradient combustion device. By the adoption of the efficient and clean multi-gradient combustion device for the coal and the use method, emission of NOx, SO2 and particles can be lowered remarkably under the condition of not taking the end treatment means. The device comprises a multi-gradient combustion device furnace body, a coal inlet, an air opening, an igniter burner, a pressure relief opening, a residue discharge chamber, a flue and an observation hole. Compared with an existing coal combustion device, by the adoption of the efficient and clean multi-gradient combustion device for the coal and the use method, expect for the effects that the pulverized coal combustion is sufficient, the thermal efficiency is high, and the combustion is stable, the device has the main characteri