Bundle radiation boiler capable of reducing high-alkalinity coal burning contamination

The utility model provides a bundle radiation boiler capable of reducing high-alkalinity coal burning contamination, which comprises a Pi type boiler and the bundle radiation boiler, wherein the top of the Pi type boiler is provided with a horizontal flue towards one side, and the Pi type boiler is communicated with a flue gas inlet in the top of the bundle radiation boiler through the horizontal flue; the bundle radiation boiler comprises a radiation heat exchange part, a convection heat exchange part and a casing; the radiation heat exchange part is located in the middle of the casing; the convection heat exchange part is located between the radiation heat exchange part and the casing; and a flue gas outlet is formed in the upper end of a side wall of the casing and is higher than the convection heat exchange part. The bundle radiation boiler adopts a hearth of the traditional Pi type boiler to be matched with the radiation boiler, therefore, a convection heat exchange surface is avoided in an interval between 600 DEG C and 1100 DGE C, and the boiler with descending bundle radiation has forward flow with the flue gas and is arranged codirectionally to reduce the heating surface contamination.