hg cems: a researcher’s perspective jeff ryan office of research and development national risk...
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Hg CEMs: A Researcher’s Hg CEMs: A Researcher’s PerspectivePerspective
Jeff RyanJeff Ryan
Office of Research and DevelopmentOffice of Research and Development
National Risk Management Research LaboratoryNational Risk Management Research Laboratory
Air Pollution Prevention and Control DivisionAir Pollution Prevention and Control Division
Air Pollution Technology BranchAir Pollution Technology Branch
email: [email protected]: [email protected]
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Hg CEMs: Potential ApplicationsHg CEMs: Potential Applications
ResearchSource CharacterizationProcess optimization/controlRegulatory
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Hg CEMs: Research ApplicationsHg CEMs: Research Applications
Understanding Hg species is key to understanding Hg control– Fundamental studies
• Hg chemistry in combustion processes• Fundamental control research
– Control technology evaluations• Pilot-plant and Field studies
Source Characterization– Emission profiles– Source variability
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Total vs. Speciating?Total vs. Speciating?
Most Hg CEMs measure total HgSpeciating Hg CEM valuable
– Research tool– Process monitor
Speciation by difference (total – elem.)Speciated Hg meas. more complicated
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Hg CEMs: State-of-the-ArtHg CEMs: State-of-the-Art
Hg CEMs routinely used in Europe In US, Hg CEMs primarily used for
research purposes– Diverse measurement environments– Majority prototype systems– Commercial systems current focus of
performance testing Many vendors now exist Recent field test programs have done
much to advance the technology
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Wet vs. Dry Conversion SystemsWet vs. Dry Conversion Systems
Wet chemistry reduction systems most proven– Intensive to operate– Chemical handling issues
Dry systems less proven, but have much greater advantages
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ORD/NRMRL Hg CEM ResearchORD/NRMRL Hg CEM Research
Hg CEMs needed to support our researchData quality criticalMain areas of emphasis:
– Development of diagnostic and QA/QC tools– Investigation of measurement issues (biases,
interferences, etc)– Performance testing (Pilot-scale and field)
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Development of QA/QC ToolsDevelopment of QA/QC Tools
Elemental Hg gas standard– Drift checks, system bias, calibration
Oxidized Hg (HgCl2) gas standard– System bias checks, sample transport,
converter efficiency, etc
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Elemental Hg Gas StandardElemental Hg Gas Standard
Tank stabilityTank concentrationDelivery issues
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0 2 4 6 8 10 12
time (min)
0
2
4
6
8
10
12
14
Hg
co
nc
en
tra
tio
n, u
g/m
3Seefelder response to Hg tank (CC19870), 16 ug/Nm3
range 0-20 ug/m3
11.8 ug/m3
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0 5 10 15
time (min)
0
5
10
15
Hg
co
nc
en
tra
tio
n, u
g/m
3Seefelder response to Hg tank (CC19931), 16 ug/Nm3, NEW REGULATOR
range 0-20 ug/m3
13.0 ug/m3
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HgClHgCl22 Gas Standard Gas Standard
Hg speciesStabilityAccuracyTransport
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HgClHgCl22 Gas Standard Gas Standard
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Investigation of Measurement IssuesInvestigation of Measurement Issues
Interferences– SO2, SO3, Cl2, HCl, NOx, NH3, PM
Biases– Sample transport/reactivity of oxidized
forms– Conversion efficiency– Particulate-phase capture/oxidation
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Performance TestingPerformance Testing
Focus on commercial systemsResearch application issues
consistent with other applicationsCollaboration is key NRMRL/ETV Pilot-Scale TestsETV/DOE MWFA Incinerator TestsEPA/OAQPS Coal Utility Tests
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NRMRL/ETV Hg CEM TestsNRMRL/ETV Hg CEM Tests
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OAQPS Field Hg CEM TestsOAQPS Field Hg CEM Tests
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Future PlansFuture Plans
Continued field testingFocus on APCD inlet environmentsEvaluation of inertial PM probesEvaluation of dry thermal/catalytic
conversion systems
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MessageMessage
Continued field testing of Hg CEMs critical to development
Opportunities limitedCurrent OAQPS tests represent
majority of commercially available systems
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Field Evaluation of Mercury CEMS: Field Evaluation of Mercury CEMS: Coal-fired Electric Utilities Coal-fired Electric Utilities
Bill Grimley & Barrett ParkerBill Grimley & Barrett Parker Emissions Measurement Center Emissions Measurement Center (EMC),(EMC), EMAD, OAQPS, OAP, USEPAEMAD, OAQPS, OAP, USEPA
Jeff RyanJeff RyanAPPCD, NRMRL, ORD, USEPAAPPCD, NRMRL, ORD, USEPA
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OutlineOutline
Positive Findings to date Project Background
- Regulatory need - Mercury monitoring: Options and CEMS
EMC Activities - Phase 1 and Phase 2 field work
- Phase 3 Plans
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Positive Findings to DatePositive Findings to Date
Elemental (Hgo) calibration cylinders proved very useful to check CEMS calibration and verify sampling system.
“HOVACAL” HgCl2 standards generator proved very useful to challenge CEMS converters, and verify sampling system.
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Findings, cont.Findings, cont.
Wet converter CEMS passed second RATA on 10 of 15 runs with RA of 9.5%.
Dry converter CEMS #2 modifications, (between first and second RATAs) materially improved performance on second RATA, for about a week.
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Background: Regulatory NeedBackground: Regulatory Need
2 Potential regulatory pathways– CAA / Utility MACT– NEP / multi-pollutant legislation
Utility MACT finding on Dec 2000 - Propose regs by Dec 2003 - Promulgate regs by Dec 2004 - Compliance date of Dec 2007
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Background: Mercury Monitoring Background: Mercury Monitoring OptionsOptions
Mercury CEMSManual stack testingExtended Period Integrated Sampling
- using absorption media Material Balance by (Hg in fuel) –
(Hg in non-gaseous combustion by-products)
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Background: Mercury CEMSBackground: Mercury CEMS
Europe has applied certified mercury CEMS
But lack of field demonstration data on sources with co-pollutant mix typical of US sources
Decision to focus on total gaseous mercury
Existence of Draft PS - 12
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EMC ActivitiesEMC ActivitiesEvaluate CEMS for Application to
Coal-fired Electric Utilities– Site selection: 140 MW tangentially-fired
pulverized coal boiler with cold-side ESP, burning eastern bituminous
– Calibration of detectors and sample handling system with mercury standards
– Conduct RATAs with “Ontario Hydro” – Collect Data for 3 months on
performance criteria
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First PhaseFirst Phase
May - Jul 01: Contact Vendors– “Dry” versus “Wet” ionic Hg converters– Other factors
Aug – Sept 01: Installation, begin CEMS operation– Direct calibration with cylinder standards– Sampling system check with cylinder
standards and “HOVACAL”
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Sampling LocationSampling Location Sample routing: Probe to
cal/bias manifold; to 120’ TFE Teflon sample line; to sample manifold in trailer; all maintained @ 360 o F
All fittings interior TFE- coated
Sample line changed to PFA Teflon Oct 01
Sampling bias check “up and back”
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Sampling LocationSampling Location
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First Phase cont.First Phase cont.
Oct 01: First RATA - 12 runs
Nov 01: Vendors service units - catalytic converter issues - mechanical problems
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First Phase cont.First Phase cont.
Jan 02: APPCD, NRMRL Installs a Third CEMS – Wet Converter CEMS, “on stack” location
Mar 02: Second RATA Series– 15 “Ontario Hydro” Runs versus 12– Coal: Source Change
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First Phase, CEMS manifoldFirst Phase, CEMS manifold
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First Phase, temperature controlsFirst Phase, temperature controls
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First Phase cont.First Phase cont.
CEMS challenged by– Elemental mercury
cylinder gas
– HgCl2 generated by
a “Hovacal” (see right)
• HgCl2 produced
using precision mass flowrate controller
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First Phase cont.First Phase cont.
Dry conversion CEMS # 1– Catalyst converts
oxidized to elemental mercury
– Cold vapor atomic adsorption UV photometer detects mercury
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First Phase cont.First Phase cont.
Dry Conversion CEMS # 2– Catalyst coverts
oxidized to elemental mercury
– Cold vapor atomic adsorption UV photometer detects mercury
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First Phase cont.First Phase cont.
APPCD’s Wet conversion CEMS added to test– Converter unit
illustrated– Located near stack
port
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First Phase ResultsFirst Phase Results
Standards, sampling system field verified
Wet conversion system RATAOntario Hydro confirms expected Hg
species splitVendor awareness increased
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RATA #2: Wet Converter CEMSRATA #2: Wet Converter CEMS
Run # CEMS RM Diff.
1 4.5 3.9 -0.6
2 4.4 4.3 -0.1
8 9.1 8.0 -1.1
9 8.6 7.7 -0.9
10 9.4 9.1 -0.3
11 7.8 7.8 0.0
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RATA #2: Wet Converter CEMSRATA #2: Wet Converter CEMS
Run # CEMS RM Diff.
12 8.3 8.5 0.2
13 9.8 11.5 1.7
14 9.5 10.1 0.6
15 7.0 8.5 1.5
Avg. 7.8 7.9 0.1
S.D. 0.9
C.C. 0.7
Relative Accuracy: 9.5 %
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RATARATA #2: Dry Converter CEMS # 2#2: Dry Converter CEMS # 2
Run # CEMS RM Diff
1 5.2 3.9 -1.3
2 6.6 4.3 -2.3
3 5.2 3.7 -1.5
4 3.1 3.6 0.5
5 3.8 4.2 0.4
6 3.6 4.3 0.7
7 4.0 3.3 -0.7
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RATA #2: Dry Converter CEMS # 2RATA #2: Dry Converter CEMS # 2
Run # CEMS RM Diff
8 5.3 8.0 2.7
9 5.4 7.7 2.3
10 7.3 9.1 1.8
11 1.3 7.8 6.5
12 3.2 8.5 5.3
13 3.4 11.5 8.1
14 1.8 10.1 8.3
15 1.3 8.5 7.2
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Second PhaseSecond Phase
June 02: resurveyed vendors to locate more participants
Aug 02: acquired and installed 2 “new” dry converter CEMS, arrangements made to further modify old dry converter CEMS #2
Sept ’02: relocated wet converter CEMS to trailer
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Second Phase, cont.Second Phase, cont.
Sept 02: added EPRI integrated sample monitoring system
Sept 02: completed third RATA series
Oct 02: added two additional dry converter CEMS, one with “new” measurement technology
Dec 02: fourth RATA series planned
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Second Phase, cont.Second Phase, cont.
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Second Phase, cont.Second Phase, cont.
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Second Phase, cont.Second Phase, cont.
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Second Phase, cont.Second Phase, cont.
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Second Phase, cont.Second Phase, cont.
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Second Phase, cont.Second Phase, cont.
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Current Evaluation StatusCurrent Evaluation Status
Hg Standards Sampling SystemRATA Test ResultsCEMS Availability
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What’s Next ?What’s Next ?
Electric Utility MACT– Assess Mercury Limit & Standard
• Total vs. Speciated• Percent Reduction vs. Limit
– Prepare Monitoring & Testing Recommendations
• Proposal or Request for Comment
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What’sWhat’s NextNext ? (continued)? (continued)
Electric Utility MACT (continued)– Adjust draft PS-12 as needed
– Conduct Phase III if required• Bituminous with wet scrubber and ESP• Adsorbent injection with hot side ESP• Subbituminous with SCR (or SNCR)
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What’sWhat’s NextNext ? (continued)? (continued)
Multipollutant Legislation– Track Progress and Content
• Administration, Jeffords, Others• Instrument Mandate, Trading Provisions,
Speciated Limits, Implementation Schedule
Consent Decrees for Hg CEMS– Offer Advice and Assistance
• PSEG Mercer (NJ) & Others
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What’sWhat’s Next ? (continued)Next ? (continued)
Hazardous Waste Combustors– Review ETV Results from Oak Ridge
Mercury Cell Chlor-Alkali Plants– Develop Test Program with Chlorine
InstituteState Regulations
– Share Information with Massachusetts and Others
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AcknowledgementsAcknowledgements
Bill Maxwell & Bob Wayland, ESDRalph Roberson, RMB ConsultantsUtility site personnelCEMS vendorsMRI and Arcadis personnel