《SCR Design Optimization.ppt》由会员分享，可在线阅读，更多相关《SCR Design Optimization.ppt（33页珍藏版）》请在三一办公上搜索。
1、07 Sept 2006,Subtitle(Arial 22 to 24),-Add text to be highlighted here-,The 2nd China InternationalDeSO2 and DeNOx Exhibition&Conference,SCR Design Optimization,Mou Jian,Dr.,Table of Contents,IntroductionAerodynamic DesignDuct DesignReactor and CatalystAmmonia InjectionSummary,ALSTOM Environmental C
2、ontrol Systems,Employs around 1300air pollution controlprofessionalsLocated in 13 countries around the worldDedicated R&D facilities70 years experience in air pollution control,Our Organization,Introduction,Combustion TechnologiesLow NOx BurnersOFA/UFASNCRReburning-Gas,Oil,CoalAdvanced Controls-Neur
3、al NetsSCRSCONOx,Alstoms DeNOx Technologies,Introduction,First full scale SCR operational in 1992#1 SCR supplier for coal-fired boilers in US30%market shareSCR ExperiencesFuel types:coal,oil,gas,waste,sludge,bio-fuelDesign experiences:high/medium/low dust,front/tail endCatalyst:with many worldwide s
4、uppliers,on-going R&D test programs,Alstoms SCR Experience,Introduction-SCR,Introduction SCR,SCR Design Parameters,Important SCR Design ParametersSystem aerodynamic designAmmonia inject grid designReactor designCatalyst selection and arrangementSystem pressure dropCatalyst lifeTuning&maintenance,Tab
5、le of Contents,IntroductionAerodynamic DesignDuct DesignReactor and CatalystAmmonia InjectionSummary,Aerodynamic Design,Design Elements CFD&PhysicalVelocityNOx profileAmmonia profileNH3/NOx mixingFlue gas temperatureParticulate,NOx Profile-Example,Aerodynamic Design,Physical Modeling,Alstom models e
6、very SCR system it supplies,Aerodynamic Design,Flue Gas Flow Testingphysical&CFD modelsproprietary design standardsextensive field experienceinternal model shopGas Distribution Devicesproprietary gas mixerturning valves/inlet hoodstraightening vanesuniform temperature,flow,concentration,ALSTOMs Expe
7、rtise,Fluid Dynamics,Current:CV(NH3/NOx)=5.6,Optimized:CV(NH3/NOx)=3.1,Optimized,Optimised Catalyst Arrangement:A Real Example,Table of Contents,IntroductionAerodynamic DesignDuct DesignReactor and CatalystAmmonia InjectionSummary,Duct Design,Flue Gas VelocityDust settingTurndown RatioNeed to be con
8、sideredSupport SteelDust depositCorners dead zoneAIG nozzles,damper seat,etc.,Duct Design,Knowledge of the coal/combustion:clay content,wash,fineness,comb.additives,etc.Well considered flue gas duct designProprietary pop-corn ash collecting device:knock-down separatorSoot-blowing,screening,etc.,Prev
9、enting Ash Deposition,Duct Design,NH3/NOx Distribution in the Duct,Aerodynamic Design,Example of Ash Deposition&Erosion,Table of Contents,IntroductionAerodynamic DesignDuct DesignReactor and CatalystAmmonia InjectionSummary,Catalyst&Reactor,Dust LoadTemperatureDew pointPerformanceSO2 conversion,pois
10、ons,etc.EconomicInitial costOperation cost,Reactor and Catalyst,Catalystsdeactivates with time due to:sinteringpoisoningpore blockageAmmonia slippage increases as catalyst deactivatesammonium sulfates,Catalyst Poisoning,Catalyst Formulation,NH3 Slip and Catalyst Vol,Reactor and Catalyst,Reactor Desi
11、gn in Recent US Projects,Cost vs Design,The regression equation isCat,$/mscf=1.89-0.022 SO2 Ox,%+0.000015 CatLife,hrs Predictor Coef SE Coef T PConstant 1.8947 0.9559 1.98 0.061SO2 Ox,-0.0223 0.1416-0.16 0.877CatLife,0.00001516 0.00002657 0.57 0.575SCR Temp-0.001100 0.001375-0.80 0.433S=0.2364 R-Sq=
12、12.3%R-Sq(adj)=0.0%,Cost($)vs Design ParametersSO2 oxidation,catalyst life,SCR temp,etc.,Reactor and Catalyst,Low dust load in the reactor and ductLong catalyst life,small catalyst pitch,Less catalystMay require auxiliary heater/heat exchanger,Tail-end SCR,Table of Contents,IntroductionAerodynamic D
13、esignDuct DesignReactor and CatalystAmmonia InjectionSummary,Ammonia Injection,AIG Design Improvement,Ammonia Injection,Ammonia injection is divided into zonesaccording to system characteristicsEach zone is adjusted independentlyBetter suited for heterogeneous flue gas and NOx profile from the boile
14、r,Zoned NH3 Injection Control,Table of Contents,IntroductionAerodynamic DesignDuct DesignReactor and CatalystAmmonia InjectionSummary,Summary,Reliable system,extensive experiencesOptimized design,customarized solutionsIn-house solutions for plant integrationboiler by-passammonium sulfates at APHID fan integrationSulfur trioxide controlplume at stacklow oxidationContinuous Improvement,Alstoms SCR Technology,
