The flue system is composed of smoke pipe, bracket, expansion joint, access port, maintenance platform, dust cleaning port and flue ramming. The flue gas produced in the furnace is discharged by two flue pipes and then merged into one, which is connected to the energy and environmental protection system.

The flue is welded structure, and the upper part of the flue is provided with a manhole. The flue is insulated by flue resistant materials, and all the anchoring parts are welded in the flue.