Scrubber Chemistry - Wpca.info

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Two Types of Gypsum Precipitation• Nucleation (spontaneous)• Crystal growth (controlled)Gypsum Precipitation Rate, r GSafeCrystal GrowthNucleationScaling1.3 – 1.4Gypsum Relative Saturation, RS G
Factors that Determine Type of GypsumPrecipitation• Relative saturation of the solution• The presence of sufficient amount of seedsolids• The rate at which the gypsum precipitates
Page 1 and 2: Duke Energy SeminarSeptember 3 - 5,
Page 3 and 4: Presentation Outline• FGD Chemist
Page 5 and 6: Types of SolutionsGas-Liquid(CO 2an
Page 7 and 8: Acids and BasesDefinition: Acid = p
Page 9 and 10: Overall Chemistry of a Limestone Fo
Page 11 and 12: Wet Limestone Forced Oxidized Proce
Page 13 and 14: Mass Transfer and Reaction Steps Oc
Page 15 and 16: Mass Transfer and Reaction Steps Oc
Page 17 and 18: Acid-Base Equilibrium ReactionsSO 2
Page 19 and 20: Liquid-Phase Alkalinity (cont.)Exam
Page 21 and 22: Solid-Phase AlkalinityExamples:Abso
Page 23 and 24: Sulfite OxidationDepends On:• Rat
Page 25 and 26: What is Present in the Liquid Phase
Page 27: Q: Will Gypsum (CaSO 4.2H 2 O)Preci
Page 31 and 32: Gypsum Crystal: Triclinic System(No
Page 33 and 34: FGD Gypsum Solids From Different Pr
Page 35 and 36: Performance Variables That RequireC
Page 37 and 38: SO 2 Removal Efficiency (cont.)Key
Page 39 and 40: Causes of ScalingKey Factors• Oxi
Page 41 and 42: pH / Utilization / SO 2 RemovalRela
Page 43 and 44: Explanation of Effect of Slurry Den
Page 45 and 46: Effect of Dissolved CalciumConcentr
Page 47 and 48: Effect of Soluble Aluminum onLimest
Page 49 and 50: Effect of Limestone Grind(Different
Page 51 and 52: Chemical Process Problems -How To I
Page 53 and 54: Scaling and Solids BuildupCommon ar
Page 55 and 56: Causes of Scaling in FGD SystemsHig
Page 57 and 58: Causes of Scaling in FGD SystemsWet
Page 59 and 60: Mist Eliminator Pluggage• Chemica
Page 61 and 62: Considerations For ME Wash System
Page 63 and 64: Limestone Blinding• In forced oxi
Page 65 and 66: Poor SO 2 Removal as Result ofMecha
Page 67 and 68: Poor Gypsum Byproduct Quality• Hi

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