中国石油西南油气田公司川中油气矿磨溪天然气净化厂有4台燃气蒸汽锅炉，污染物排放浓度符合GB 13271—2014《锅炉大气污染物排放标准》所规定重点地区大气污染物特别排放限值要求，为适应越来越严格的减排要求，尚需进行低氮燃烧改造。磨溪天然气净化厂于2024年8月采用“低氮燃烧器+烟气再循环”技术对燃气蒸汽锅炉的燃烧器和烟道实施改造，优化锅炉燃烧器结构和燃烧控制方式，降低火焰温度和烟气氧含量，再循环烟气通过助燃风通道再次引入炉膛，降低炉膛温度。改造之后排放烟气中NO_X浓度低于30 mg/m³。“低氮燃烧器+烟气再循环技术”改造方案简单、投资小，减排效益显著，为现有在用燃气锅炉实现减排和“双碳”目标提供了可借鉴、可推广路径。

The Moxi Natural Gas Purification Plant of PetroChina Southwest Oil & Gasfield Company(ChuanZhong Oil & Gas Division) operates four gas-fired steam boilers, with pollutant emission concentrations meeting the special emission limits for key regions specified in GB 13271—2014 “Emission Standard of Air Pollutants for Boilers”. However, to comply with increasingly stringent emission reduction requirements, low-NOx combustion retrofitting was still necessary. In August 2024, the plant implemented a modification project using the “low-NOx burner + flue gas recirculation(FGR)” technology on the boilers' burners and flue ducts. This retrofit optimized burner structure and combustion control to reduce flame temperature and oxygen content in the flue gas, while recirculated flue gas was reintroduced into the furnace through the combustion air channel to further lower the furnace temperature. After the retrofit, the NOx concentration in flue gas emissions was reduced to below 30 mg/m³. The “low-NOx burner + FGR” retrofit scheme is simple, requires low investment, delivers significant emission reduction benefits, and provides a replicable and scalable pathway for emission reduction and the achievement of “ dual carbon” targets in existing gas-fired boilers.