摘要
为有效抑制生活垃圾在机械炉排炉焚烧过程中NO_(X)的产生,有研究者提出采用烟气回流技术可以有效抑制NO_(X)的生成和排放。目前关于烟气回流技术的理论研究和数值模拟较多,而基于实际工程应用的研究较少。选择了烟气回流工艺在山东省某生活垃圾焚烧项目上的应用情况进行研究,从烟气回流工艺的技术原理、排放指标、运营数据和经济性等方面进行了分析,同时也总结了本工艺在应用过程中需注意的事项。研究表明,采用烟气回流工艺的#3炉引风机出口NOX平均排放和氨水平均用量比未采用烟气回流工艺的#1炉,分别降低了25.8%和43.7%,且NO_(X)浓度波动与烟气含氧量密切相关。总体上,烟气回流工艺的使用能够有效抑制NO_(X)的产生,并且同时减少了氨水等物料的消耗,降低了运营的成本。但是当进入焚烧炉的垃圾品质出现急剧恶化的情况下,会影响焚烧炉的燃烧工况而使烟气回流量降低,导致NOX减排效果下降。
In order to effectively control the NO_(X) generation during the incineration of municipal solid waste(MSW)in the mechanical grate furnace,some researchers proposed that the flue gas recirculation(FGR)technology can effectively inhibit the generation and emission of NO_(X).At present,there are more theoretical research and numerical simulation on FGR technology,but less research based on practical engineering application.In this paper,the application of FGR technology in a MSW incineration project in Shandong Province was studied.This paper analyzed the technical principle,emission index,operation data and economy of FGR technology,and summarized the matters needing attention in the application of this process.The results showed that the average NO_(X) emission and the average ammonia consumption at the outlet of induced draft fan of No.3 boiler with FGR were 25.8%and 43.7%lower than those of No.1 boiler without FGR,respectively.The fluctuation of NO_(X) concentration was closely related to the oxygen content of flue gas.In general,the application of FGR technology can effectively inhibit NO_(X) production,and reduce the consumption of ammonia and other materials,and reduce the operation cost.However,when the quality of garbage entering the incinerator deteriorates sharply,the combustion condition of the incinerator may be affected and the flue gas return flow will be reduced,resulting in the reduction of FGR amount and NO_(X) emission reduction effect.
作者
金兴乾
刘栋
李卫华
孙英杰
JIN Xing-qian;LIU Dong;LI Wei-hua;SUN Ying-jie(Shanghai SUS Eiwironment Co.,Ltd.,Shanghai,201703,China;Qingdao West Coast SUS Renewable Energy Co.,Lid.,Qingdao,Shandong,266500,China;Qingdao University of Technology,School of Environmental and Municipal Engineering,Qingdao,Shandong,266033,China)
出处
《四川环境》
2022年第1期257-263,共7页
Sichuan Environment
关键词
生活垃圾焚烧
氮氧化物
超低排放
烟气回流
municipal solid waste(MSW)incineration
nitrogen oxides(NOX)
ultra-low emission
flue gas recirculation(FGR)
