Scrubber Chemistry - Wpca.info

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Poor Reagent UtilizationCauseMalfunctioning pH MonitorAnalyticalIndicationPoor agreement during pHcalibration checkCorrective ActionMake repairs to pH monitorsystemSulfite BlindingPoor reagent utilizationalong with elevated levelsof soluble sulfiteAluminum Fluoride Blinding Poor reagent utilizationalong with elevated levelsof aluminum and fluorideVerify operation of oxidationair system. Correct asrequiredImprove particulate removalupstream of scrubberPoor Limestone Quality orOff-Spec Grind SizeSieve analysis, compositionanalysisModify grind circuit and/orobtain better limestone
Poor Gypsum Byproduct Quality• High acid insoluble (inerts) fraction− Verify operation of particulate control device upstream ofscrubber− Optimize operation of process hydroclones to maximizeconcentration of inerts in overflow− Increase liquid purge rate• Poor reagent utilization• Low sulfite oxidation− Verify operation of oxidation air system
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Duke Energy SeminarSeptember 3 - 5,
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Presentation Outline• FGD Chemist
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Types of SolutionsGas-Liquid(CO 2an
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Acids and BasesDefinition: Acid = p
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Overall Chemistry of a Limestone Fo
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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 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: Poor SO 2 Removal as Result ofMecha
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Scrubber Chemistry - Wpca.info

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