Boiler flue gas treatment system and method capable of preventing tail heating surface from low-temperature corrosion

• Main Author: SHANG YANFEI
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2019
• Subjects: AIR SUPPLY; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHINBOILERS; BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; CONTROLLING WATER LEVEL; DRAUGHT-INDUCING; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; FEED-WATER SUPPLY; FLUES; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METHODS OF STEAM GENERATION; PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER; REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES; STEAM ACCUMULATORS; STEAM BOILERS; STEAM ENGINE PLANTS; STEAM ENGINES; STEAM GENERATION; SUPPLYING NON-COMBUSTIBLE LIQUID OR GAS; WEAPONS

The invention discloses a boiler flue gas treatment system and method capable of preventing a tail heating surface from low-temperature corrosion, and mainly solves the technical problems that a boiler air preheater in the prior art easily generates low-temperature corrosion, ash clogging and denitration catalyst failure at the flue gas side. A high-temperature coal economizer, a low-temperature coal economizer, a high-temperature air preheater and an organic medium evaporator are arranged inside a flue of the treatment system, wherein a high-temperature metal bag type dust collector and a selective catalytic reduction denitration device are arranged outside the flue; the high-temperature coal economizer is sequentially connected to the high-temperature metal bag type dust collector, the selective catalytic reduction denitration device, the low-temperature coal economizer, the high-temperature air preheater, the organic medium evaporator, the high-temperature preheater and an organic medium condenser; the org