SCR Design Optimization

1、the 2nd china internationaldeso2 and denox exhibition & conferencescr design optimizationmou jian, dr.scr design optimization, m. jian, sept 07, 2006table of contentslintroductionlaerodynamic designlduct designlreactor and catalystlammonia injectionlsummaryscr design optimization, m. jian, sept 07,

2、2006alstom environmental control systemslemploys around 1300air pollution controlprofessionalsllocated in 13 countries around the worldldedicated r&d facilitiesl70 years experience in air pollution controlour organizationscr design optimization, m. jian, sept 07, 2006introductionlcombustion technolo

3、gieslow nox burnersofa/ufalsncrlreburning - gas, oil, coalladvanced controls - neural netslscrlsconoxalstoms denox technologiesscr design optimization, m. jian, sept 07, 2006introductionlfirst full scale scr operational in 1992l#1 scr supplier for coal-fired boilers in us30% market sharelscr experie

4、ncesfuel types: coal, oil, gas, waste, sludge, bio-fueldesign experiences: high/medium/low dust, front/ tail endcatalyst: with many worldwide suppliers, on-going r&d test programsalstoms scr experiencescr design optimization, m. jian, sept 07, 2006introduction - scrscr design optimization, m. jian,

5、sept 07, 2006introduction scrscr design optimization, m. jian, sept 07, 2006scr design parameterslimportant scr design parameterssystem aerodynamic designammonia inject grid designreactor designcatalyst selection and arrangementsystem pressure dropcatalyst lifetuning & maintenancescr design optimiza

6、tion, m. jian, sept 07, 2006table of contentslintroductionlaerodynamic designlduct designlreactor and catalystlammonia injectionlsummaryscr design optimization, m. jian, sept 07, 2006aerodynamic designldesign elements cfd & physicalvelocitynox profileammonia profilenh3/nox mixingflue gas temperature

7、particulatescr design optimization, m. jian, sept 07, 2006nox profile - examplescr design optimization, m. jian, sept 07, 2006aerodynamic designphysical modelinglalstom models every scr system it supplies scr design optimization, m. jian, sept 07, 2006aerodynamic designlflue gas flow testingphysical

8、 & cfd modelsproprietary design standardsextensive field experienceinternal model shoplgas distribution devicesproprietary gas mixerturning valves / inlet hoodstraightening vanesuniform temperature, flow, concentrationalstoms expertisescr design optimization, m. jian, sept 07, 2006fluid dynamicscurr

9、ent:cv(nh3/nox)=5.6optimized:cv(nh3/nox)=3.1optimizedoptimised catalyst arrangement: a real examplewateree designcurrentoptimizedcv (nh3/nox)%5.63.1initial catalyst chargem3375364catalyst arangement10 x1211x13pressure droppa450324life cost$m11.310.8saving05.1%scr design optimization, m. jian, sept 0

10、7, 2006table of contentslintroductionlaerodynamic designlduct designlreactor and catalystlammonia injectionlsummaryscr design optimization, m. jian, sept 07, 2006duct designlflue gas velocitydust settinglturndown rationeed to be consideredlsupport steeldust depositlcorners dead zoneaig nozzles, damp

11、er seat, etc.scr design optimization, m. jian, sept 07, 2006duct designlknowledge of the coal / combustion: clay content, wash, fineness, comb. additives, etc. lwell considered flue gas duct designlproprietary pop-corn ash collecting device: knock-down separatorlsoot-blowing, screening, etc.preventi

12、ng ash depositionscr design optimization, m. jian, sept 07, 2006duct design nh3/nox distribution in the ductscr design optimization, m. jian, sept 07, 2006aerodynamic designexample of ash deposition & erosionscr design optimization, m. jian, sept 07, 2006table of contentslintroductionlaerodynamic de

13、signlduct designlreactor and catalystlammonia injectionlsummaryscr design optimization, m. jian, sept 07, 2006catalyst & reactorldust loadltemperaturedew pointlperformanceso2 conversion, poisons, etc.leconomicinitial costoperation costscr design optimization, m. jian, sept 07, 2006reactor and cataly

14、stlcatalystsdeactivates with time due to:sinteringpoisoningpore blockagelammonia slippage increases as catalyst deactivatesammonium sulfatescatalyst poisoningscr design optimization, m. jian, sept 07, 2006catalyst formulation0.01.02.03.0285295305315325335345355365375temperature (oc)relative so2 oxid

15、ationformulation 2low activityformulation 1high activityscr design optimization, m. jian, sept 07, 2006nh3 slip and catalyst volimpact of nox & slip level on catalyst size0.80.911.11.2100200300400inlet nox, noxi, ppmslip = 50 ppmslip = 5 ppmcatalyst volumecatalyst volume is insensitive to nox levels

16、catalyst volume is dependent on nox and ammonia slipscr design optimization, m. jian, sept 07, 2006reactor and catalystreactor design in recent us projectsalsto m proj ect c apaci t y n o x fl ow tem perat ure react or c at al yst li f e m w l b/hr ( n o 2) f arrangem ent hrs proj ect 1 563 4,375 70

17、0 2+ 2 16,000 proj ect 2 567 4,044 670 2+ 1 16,000 proj ect 3 181 734 638 2+ 1 16,000 proj ect 4 344 1,058 690 2+ 1 16,000 proj ect 5 680 3,194 610 3+ 1 16,000 proj ect 6 693 4,688 630 3+ 1 16,000 proj ect 7 372 1,693 750 2+ 1 16,000 proj ect 8 680 3,180 708 2+ 1 16,000 proj ect 9 150 835 720 2+ 1 1

18、6,000 proj ect 10 624 5,489 689 3+ 1 20,000 proj ect 11 1150 8,127 673 3+ 1 20,000 proj ect 12 280 2,417 706 2+ 1 20,000 proj ect 13 280 2,417 706 2+ 1 20,000 proj ect 14 900 5,281 655 3+ 1 12,000 proj ect 15 1300 7,549 650 3+ 1 18,000 proj ect 16 500 2,147 820 2+ 1 16,000 proj ect 17 150 1,108 650

19、2+ 1 20,000 proj ect 18 760 1,163 650 2+ 1 20,000 scr design optimization, m. jian, sept 07, 2006cost vs designthe 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

20、.00001516 0.00002657 0.57 0.575scr temp -0.001100 0.001375 -0.80 0.433s = 0.2364 r-sq = 12.3% r-sq(adj) = 0.0%lcost ($) vs design parametersso2 oxidation, catalyst life, scr temp, etc.scr design optimization, m. jian, sept 07, 2006reactor and catalystllow dust load in the reactor and ductllong catal

21、yst life, small catalyst pitch, less catalystlmay require auxiliary heater/heat exchangertail-end scrscr design optimization, m. jian, sept 07, 2006table of contentslintroductionlaerodynamic designlduct designlreactor and catalystlammonia injectionlsummaryscr design optimization, m. jian, sept 07, 2006ammonia injectionaig design improvementscr design optimization, m. jian, sept 0