Feedwater → Economizer inlet header →Economizer pipe bundles→Economizer outlet header→ Drum→ Downcomer→ Waterwall lower header→ Riser→ Waterwall upper header→ Steam-water connecting tube→ Drum→ Saturated steam introducing pipe→ Inlet header of suspended tube→ Suspended tube bundle→Inlet header of low-temperature superheater→ low-temperature superheater tube bundle → Outlet header of low-temperature superheater → Spray desuperheater → Inlet header of high-temperature superheater → High-temperature superheater tube bundle → Outlet header of high-temperature superheater → Connecting tube → Steam-collected header