Exhaust gas heat recovery method, exhaust gas heat recovery device, and exhaust gas heat recovery system

摘要

PROBLEM TO BE SOLVED: To further recover thermal energy from exhaust gas discharged from a boiler and recover thermal energy by an economizer, and to enable desulfurization / denitration without additives. An exhaust gas heat recovery device 3 is composed of a shell 31 as an exhaust gas flow path made of a tube body made of a corrosion-resistant material, and a tube body made of a corrosion-resistant material arranged inside the shell 31. It is contained in the exhaust gas flowing in the shell 31 which is cooled by the cooling medium by heat exchange between the tube 39 as the cooling medium flow path and the cooling medium flowing in the tube 39 and the exhaust gas flowing in the shell 31 and dew condensation. It has an outlet 38 for sulfuric acid produced by the reaction of the water vapor and the SOx component. [Selection diagram] Fig. 2