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The HRSG is composed of drum, movable hood, flue at furnace mouth, flue at inclined section 1, flue at inclined section 2, flue at last section 1, flue at last section 2, feeding pipe (distribution chute), oxygen lance mouth, nitrogen sealing device and nitrogen sealing plug, manhole, micro differential pressure device, supports and hangers of flue, etc. The HRSG consists of six circulation loops, each of which is composed of down comer and riser. The feed water of each section of flue is introduced into the lower header of each flue through the downcomer and then enters each heating surface where the water is generated into steam that enters the inlet header, which will be led into the drum throug the upper riser. Each flue is connected by flange.