Mercury Speciation in Flue Gas from Coal-fired Power Stations
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1 Mercury Speciation in Flue Gas from Coal-fired Power Stations Matthew A Dexter, Warren T Corns and Peter B Stockwell P S Analytical Arthur House Crayfields Industrial Estate Main Road Orpington BR5 3HP
2 Overview Hg in stack gas measurements Why? Offline analysis Continuous Emission Monitors Sample collection Sample transport Sample pre-treatment Analysis Calibration Typical Data Summary
3 Why Measure Power Station Hg Emissions? Public concern about Hg emissions Environmental accumulation of toxic metals Major sources of emissions: coal fired power plants waste incinerators Transport strongly dependent on speciation Regulatory compliance US EPA Clean Air Mercury Rule (March 2005)
4 Offline Analysis Reference methods EPA Methods 29 and 101a (Total Mercury) Impinger based HNO 3 /H 2 O 2 or H 2 SO 4 /KMnO 4 Ontario Hydro Method (Speciation) ASTM Method D Impingers with KCl & H 2 SO 4 /KMnO 4 Monitoring methods QuickSEM TM (Total Mercury) 40 CFR Part 75 Appendix K
5 Offline Analysis Reference methods Average data over 1+ hours Labour intensive Delay for results from lab. Monitoring methods Average data over hours or days Delay for results from lab.
6 Online Analysis Continuous Emissions Monitor (CEM) Stack PROBE Heated Sample Line Sample collection Sample transport Sample pre-treatment Analysis Calibration Computer Speciation Module Hg 0 HgT Sir Galahad Stream Selector Calibration Device
7 Sample Collection - The Probe PROBE Heated Sample Line Stack Computer Speciation Module Hg 0 Hg T Sir Galahad Stream Selector Calibration Device
8 Inertial Probe Schematic Venturi Eductor Gas Outlet Flange Gas Inlet Pump Cal Gas Port Gas Sample to Analyser
9 Sample Transport Heated Lines PROBE Heated Sample Line Stack Computer Speciation Module Hg 0 HgT Sir Galahad Stream Selector Calibration Device
10 Sample transport Inert materials Durinert (glass) coatings PFA/PTFE components Temperature Raw sample Ash-free sample
11 Sample Pre-treatment The Speciation Module PROBE Heated Sample Line Stack Computer Speciation Module Hg 0 HgT Sir Galahad Stream Selector Calibration Device
12 The Speciation Module Primary Vent Thermolytic convertor Optional Reagent Feed Hg Tota Peltier Cooler Hot Flue Gas HgCl2 adsorbent Optional Reagent Feed Drain Pump Hg Peltier Cooler 0 Drain Pump Heated Oven
13 Typical Data Using Bench Scale Apparatus Dry Base Speciation Unit, Hg T channel Effect of different flue gas components conc/ng m :00 01:12 02:24 03:36 04:48 06:00 07:12 08:24 time/hh:mm air water, HCl water, HCl, SO2, NO2 water, HCl, SO2, NO2, NO
14 Analysis The Sir Galahad PROBE Heated Sample Line Stack Computer Speciation Module Hg 0 HgT Sir Galahad Stream Selector Calibration Device
15 Sir Galahad Amalgamation Atomic Fluorescence Spectroscopy Why AFS? Sensitivity Selectivity Simplicity Why amalgamation? Sample pre-treatment selectivity Sample preconcentration
16 Schematic Flow Diagram of the Sir Galahad Sample Argon Sample Argon Waste MFC AFS MFC AFS PUMP Waste PUMP Waste
17 Calibration PROBE Heated Sample Line Stack Computer Speciation Module Hg 0 Hg T Sir Galahad Stream Selector Calibration Device
18 On-Line Calibration System Air MFC 1 MFC 2 Hg Reservoir Oven Blank Span
19 A Power Station in Kentucky 120MW unit Fuel: bituminous coal Kentuckian Environmental controls Electrostatic Precipitator (ESP) No Flue Gas Desulfurisation (FGD) No DeNO x (low NO x burners)
20 A Power station in Kentucky Stack monitoring Inertial probe & wet/dry speciation Hg/ug m /10/ :00 24/10/ :00 25/10/ :00 26/10/ :00 27/10/ :00 28/10/ :00 29/10/ :00 30/10/ :00 date/time Wet and Dry Hg T show good agreement HgT dry HgT wet Hg0 dry
21 A Power Station in SE England 500MW unit Fuel: bituminous coal Russian Colombian South African <10% biomass (cereal pellets) Environmental controls Electrostatic Precipitator (ESP) No Flue Gas Desulfurisation (FGD) No DeNO x
22 A Power station in SE England Stack monitoring Heated filter blowback probe & dry speciation Unattended operation conc/ug m load/mw /11 09/11 10/11 11/11 12/11 13/11 14/11 date & time Hg levels trend with unit load 15/11 16/11 17/11 18/11 19/ Stack Hg0 Stack HgT Load/MW
23 A Power station in SE England Stack monitoring Heated filter blowback probe & dry speciation Unattended operation SO 2 trending shows variation in fuel Hg conc/ug m B SO2 conc/ppm /11 09/11 10/11 A 11/11 12/11 13/11 14/11 date & time 15/11 16/11 17/11 18/11 19/ Stack Hg0 Stack HgT SO2/ppm Hg in coal A 30 ppb B 100 ppb
24 Conclusion CEM developed to measure mercury in power station stack gases Difficult sampling, transport and pretreatment issues have been addressed Successfully operated unattended on numerous power station stacks
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