垃圾热值对焚烧炉烟气再循环运用的影响研究*龙吉生，袁旗斌，杜海亮（上海康恒环境股份有限公司，上海201703）【摘要】垃圾分类和协同处置工业有机固废的推进，使得垃圾热值（LHV）逐步升高，进而影响烟气再循环（EGR）技术在垃圾焚烧炉中的运用效果。本研究通过理论计算、数值模拟和工程试验方法，分析了垃圾LHV对垃圾焚烧炉运用EGR系统的影响。结果表明：垃圾LHV高于7953kJ/kg时再循环烟气比例控制在15%～20%效果最佳，可降低炉膛平均温度约50℃，减少炉膛结焦，提高运行稳定性；EGR耦合低空气比燃烧技术能提高锅炉效率，且垃圾LHV越高其提高锅炉效率越明显；同时EGR能有效降低焚烧炉NOx源强，可将锅炉出口NOx控制在100mg/m3（11%O2，干基）以下，实现焚烧炉低NOx源强的高效清洁燃烧。【关键词】烟气再循环；垃圾热值；氮氧化物；锅炉效率中图分类号：X701文献标识码：A文章编号：1005-8206（2023）02-0077-06DOI：10.19841/j.cnki.hjwsgc.2023.02.012ResearchontheInfluenceofLowerHeatValueonExhaustGasRecirculationTechnologyinIncineratorLONGJisheng，YUANQibin，DUHailiang（ShanghaiSUSEnvironmentCo.Ltd.，Shanghai201703）【Abstract】Theadvancementofwasteclassificationandco-processingofindustrialorganicsolidwastehadgraduallyincreasedthelowerheatvalue（LHV）ofwaste，whichinturnwouldaffecttheapplicationeffectofexhaustgasrecirculation（EGR）technologyinwasteincinerators.TheinfluencesofwasteLHVontheEGRsystemofwasteincineratorsthroughtheoreticalcalculations，numericalsimulationsandengineeringtestmethodswereanalyzed.TheresultsshowedthatwhenthewasteLHVwashigherthan7953kJ/kg，thebesteffectwastocontroltheproportionofEGRat15%～20%，whichcouldreducethefurnacetemperatureabout50℃，reducethecokingofthefurnaceandimprovetheoperationstability.EGRcoupledwithlowairratiocombustiontechnologycouldimprovetheboilerefficiency，andtheimprovementeffectwasmoreobviouswithhigherwasteLHV.Atthesametime，EGRcouldeffectivelyreducethesourcestrengthofNOxintheincinerator，andtheNOxcouldbecontrolledbelow100mg/m3（11%O2，drybasis）attheoutletofboiler.Toachievehigh-efficiencyandcleancombustionwithlowNOxsourcestrengthintheincinerator.【Keywords】exhaustgasrecirculation；lowerh...
