Fine pulverized-coal combustion industrial steam boiler

The invention provides a fine pulverized-coal combustion industrial steam boiler which belongs to the technical field of pulverized-coal fuel boilers, and aims at applying a pulverized-coal combustion technology on an industrial steam boiler. The fine pulverized-coal combustion industrial steam boiler comprises a boiler drum, a boiler furnace (2), a convection smoke flue, and an upper-level coal economizer, an upper-level air preheater, a lower-level coal economizer and a lower-level air preheater which are sequentially arranged in a vertical segment of the convection smoke flue. The fine pulverized-coal combustion industrial steam boiler is characterized in that a flame diversion wall and a coagulated slag pipe (1) are arranged at the upper part of a rear wall in the boiler furnace (2); two combustors (4) are respectively arranged at the lower middle parts of two side walls of the boiler furnace in a parallel manner; and convection pipe bundles (3) are arranged in a horizontal segment of the convection smoke flue. With the structure, the combustion of the boiler is efficient and stable.