Scrubber Chemistry - Wpca.info

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Solution <strong>Chemistry</strong>• Dissolved Cl - (Ca ++) Concentration− Inhibits dissolution due to common ion effect• Forced oxidation vs. natural oxidation− Stripping of CO 2 tends to enhance dissolution• Aluminum fluoride blinding• Sulfite blinding− Problem during periods of incomplete oxidation• All can affect the ease with which reagentdissolves and removal performance ofscrubber
Effect of Dissolved CalciumConcentration(Different Shaped Symbols Represent Different Limestone Tested)95Low Dissolved CaSO 2Removal (%)908580High Dissolved Ca750 5 10 15 20 25 30 35 40Limestone Loading (g/L)
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 and 28: Q: Will Gypsum (CaSO 4.2H 2 O)Preci
Page 29 and 30: Factors that Determine Type of Gyps
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: Explanation of Effect of Slurry Den
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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