Front and back wall opposed firing boiler for ammonia/pulverized coal dual-fuel combustion

The invention discloses a front and back wall opposed firing boiler for ammonia/pulverized coal dual-fuel combustion. According to the ammonia/pulverized coal dual-fuel combustor, ammonia and pulverized coal are subjected to blending combustion, and the problems that the laminar flame propagation speed of ammonia is low and ignition is difficult are solved; the ammonia combustion does not generate CO2, the CO2 generated by coal combustion is reduced, and meanwhile, NOx generated by coal combustion is reduced into N2 by utilizing the reducibility of NH3. A plurality of first primary air rotational flow blades, first inner secondary air rotational flow blades and first outer secondary air rotational flow blades are respectively mounted on the outer walls of the first central air pipeline, the first primary air pipeline and the first inner secondary air pipeline, the rotational flow primary air increases self disturbance, and full mixing of pulverized coal and ammonia is promoted; the rotational flow external se