关键词: 火电厂, 烟气脱硝, 选择性催化还原（ＳＣＲ）, 分级省煤器

Abstract: In this paper, the case study is conducted on the first economizer retrofit project which is for the improvement of the SCR equipment operation rate under low load conditions on a supercritical boiler. The continuous two-month operation monitoring shows that the project is feasible in ensuring the SCR operation rate under low load conditions, and furthering lowering the exhaust gas temperature at the same time. The project provides a reliable reference for upgrading the SCR denitrification equipments in other power plants.

Key words: power plant, fuel gas denitrification, selective catalytic reduction (SCR), classification of economizer