Gas sealing device for waste heat boiler, gas sealing method using this, and waste heat boiler equipped with this

摘要

PROBLEM TO BE SOLVED: To provide a gas sealing device capable of suppressing sulfuric acid corrosion of a water pipe provided in a waste heat boiler. SOLUTION: This is a gas sealing device attached to a closing means 10 of a waste heat boiler provided with a penetrating portion 4 penetrating a wall portion and a closing means 10 for closing the outlet side opening thereof, and the penetrating portion 4. A box-shaped body 21 having a hollow inside covering the outlet-side opening and the closing means 10 is preferably formed of a stainless steel plate, and a flexible tube preferably formed inside the box-shaped body 21 to supply heating gas. The heating gas supply unit 22 is provided, and preferably, the gas supply port 22a at the tip of the heating gas supply unit 22 is arranged so as to face the closing means 10. [Selection diagram] Fig. 2