基于氮氧化物的危害及国家的环保政策，华能福州电厂实施了选择性催化还原（selective catalytic reduction，SCR）脱硝改造工程。阐述了该改造工程的设计、施工难点及特点（包括工程钢结构、SCR脱硝装置本体、还原剂储存和制备系统、氨/烟气喷射与混合系统等）；分析了改造工程所涉及的设备改造问题；针对该工程设计和施工方面的不足之处，提出了建议。该工程的成功实施经验可供已建火电厂脱硝改造工作借鉴。

Based on the harm of NOx and the national environmental protection policy, the selective catalytic reduction (SCR) de-NOx reconstruction project was implemented in Huaneng Fuzhou Power Plant. This paper introduced the difficulties and characteristics of the project’s design and construction, such as the engineering steel structure, the SCR denitration device, the storage and preparation system for reducing agent, the injection and mixing system of ammonia/gas, and so on. Moreover, the design and construction problems were analyzed, and some suggestions were put forward, which could provide an important reference for other de-NOx reconstruction project in coal-fired power plants.