Fire coal gas combination type high-efficiency low discharge grate firing device

The utility model relates to a fire coal gas combination type high-efficiency low discharge grate firing device. The fire coal gas combination type high-efficiency low discharge grate firing device comprises a combustor, and a fire grate, wherein the combustor is divided into a main combustion zone, a reburning zone which is located at the upper position of the main combustion zone and a burning-out zone which is adjacent to the upper opening of the combustor, a gas nozzle which is communicated with a middle position between the combustor and the reburning zone and a burning-out air nozzle which is communicated with the lower portion of the burning-out zone are arranged on the combustor, a smoke recycling air room is arranged on the fire grate and close to the part of the bottom portion of a material inlet, and the smoke recycling air room is communicated with the tail gas outlet of the combustor through a recycling draught fan and an air liquid separator. The fire coal gas combination type high-efficiency low discharge grate firing device can not only reduce conversion from fuel nitrogen to Nox, but also improve burning efficiency of a furnace simultaneously.