Cold and hot smoke mixed combustion system for high-iron high-alkali coal boiler

A cold and hot smoke mixed combustion system for a high-iron and high-alkali coal boiler comprises a hot primary air pipeline, a hot smoke fan, a hot smoke pipeline, a cold smoke pipeline and a cold smoke fan. The hot smoke suction port is formed in a steering chamber of the boiler, the hot smoke fan is arranged on a hot smoke pipeline, the two ends of the hot smoke pipeline are connected with a hot primary air pipeline and the hot smoke suction port respectively, the cold smoke suction port is formed in a cold smoke channel, and the cold smoke fan is arranged on a cold smoke pipeline. The two ends of the cold smoke pipeline are connected with the hot primary air pipeline and the cold smoke suction port respectively, an inlet of the coal mill is connected with the hot primary air pipeline, an outlet of the coal mill is connected with the combustor through the pulverized coal pipeline, and the combustor is arranged on the boiler. According to the invention, the oxygen concentration in primary air pulverized co