Method for changing solid slagging drum boiler into double-U-shaped liquid slagging boiler

The invention discloses a method for changing a solid slagging drum boiler into a double-U-shaped liquid slagging boiler, and relates to the technical field of liquid slagging boilers. The problems that after Zhundong coal is combusted in an existing solid slagging boiler, slagging and contamination of different degrees occur, a water cooling wall of a dry bottom hopper is frequently damaged by crashing, operation faults of a deslagging system occur, a flue is blocked, and the boiler is forced to be shut down in serious situations are solved. According to the boiler, an original solid slagging boiler is transformed into the double-U-shaped liquid slagging boiler, the transformed double-U-shaped liquid slagging boiler can be used for combusting Zhundong coal with extremely high coking property or other coal types with low ash melting points, abundant Zhundong coal resources can be fully utilized, the fuel cost is reduced, and the operation economy is improved. The method is suitable for the operation field of