AVOGADRO Environmental Corporation Outline Tailored to ARIPPA members –All effected EGU’s of ARIPPA members use stack flow monitors to determine heat input for Part 75 monitoring –All effected EGU’s of ARIPPA members expect to use Excepted Monitoring Methodology; i.e. <29 pounds/year. Stepwise path Key Considerations
AVOGADRO Environmental Corporation Who Has To Monitor Hg? All coal-fired EGU’s >25 MWe for sale must monitor and report mercury emission, even low emitters. Thus, all EGU’s must submit a Phase I Monitoring Plan. Two Monitoring Approaches –“Excepted Monitoring Methodology”; EGU with <29 pounds/year. –Continuous Emission Monitoring; Any EGU PA monitoring requirements are essentially those contained in Part 75, Subpart I. Future revisions to PA CSMM will address Hg.
AVOGADRO Environmental Corporation Emission Limits 12-month rolling period, starting 2009 pounds/gigawatt-hour (lb/GWh) for coal- refuse fired circulating fluidized bed Or, 95% capture efficiency; difference between mercury entering the unit through fuel and mercury leaving through stack emissions. –Through request, credit may be given toward capture requirement from fuel pre-treatment. Comply by averaging facility-wide emissions; i.e. average emissions < average limit.
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Principle Emissions factor, micrograms per standard cubic meter. –Determine by periodic stack test. –Use default value (0.50 microgram per standard cubic meter (ug/scm)) Monitor stack flow-rate continuously Monitor electrical production Use factor, flow-rate and electrical production to continuously monitor/report Hg emissions in lb/GWh
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 1 Submit Phase I by 8/17/07 and > 45 days before Certification Test Basis for using Excepted Monitoring Methodology. –Stack test results –Material Balance –Guesstimate Methodology for periodic Hg sampling Means for monitoring stack flow-rate; must meet requirements of Part 75 Electrical production Methodology for sampling fuel Hg for units monitoring control efficiency
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 2 Submit Phase II Monitoring System Certification Protocol >45 days before Certification Test Procedures for performing gaseous Hg sampling –Currently Ontario Hydro –Proposed Part 75 Revisions include Method 29 –Two new methods (30A and 30B) due out soon. Expected to be incorporated into Part 75. Procedures for Certifying Flow CEM. –Use existing certified system certified per Part 75
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 3 Perform “certification test” in Three paired test-runs for Hg Calculate estimated annual mass-emission using: –the higher of either the highest concentration measured by the three test runs or 0.50 microgram per standard cubic meter (ug/scm) –The maximum potential stack flow-rate –8760 hours/year. Certify flow-rate monitoring system, if needed.
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 4 Evaluate test data Applies to Certification test or retest Annual Estimated Hg Emissions of <29 pounds/yr validates Excepted Monitoring Methodology monitoring system. Annual Estimated Hg Emissions of >29 pounds/yr = continuous emission monitoring system Submit Certification Application <45 days of test.
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 5 Report emissions, starting January 1, 2009 Calculate hourly Hg emissions in lb/GWh using: –Hg emission factor, the higher of: highest concentration measured by highest of most recent certification test or retest runs test runs 0.50 ug/scm –Actual stack flow-rate measured by CEM. –Measured electrical production
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Step 6…on Perform Periodic Certification Retest Within 720 operating hours of fuel change Based on most recent test data –Calculate estimated annual emissions per Step 3 using the higher of the highest most recent test/retest runs or 0.50 ug/scm. If estimated annual emissions are: <9 pounds/year, perform next retest by 4 operating quarters after calendar quarter of last test/retest >9 pounds/year and 9 pounds/year and <29 pounds/year, perform next retest by 2 operating quarters after calendar quarter of last test/retest
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Test Methods Ontario Hydro –Relatively Expensive –Provides information about types of Hg; particle-bound, elemental, reduced, oxidized –Data availability 24 hours-2 weeks. Method 29 –Less costly than OH. –Provides information on total particle-bound and total gaseous Hg –Data availability 24 hours-2 weeks
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Test Methods (continued) Draft EPA Method 30A –Instrument-based; real-time data availability! –Track trends easily –EPA is pushing strongly –Equipment geared toward emission testing still under development Draft EPA Method 30B –Uses dry sorbent tube. –Relatively inexpensive –Proven, reliable methodology; equipment readily available –Data availability 1 hour – 2 weeks –Long-term test runs; up to 1 week – ug/dscm sensitivity possible for a twenty-four sample
AVOGADRO Environmental Corporation Excepted Monitoring Methodology Key Considerations Test firm for both Hg test and flow monitoring system RATAs must be accredited per draft Part 75 revisions. Fuel variability and retesting. Graph is for daily samples taken at different intervals over three month period. Highest value is >2X lowest value. Maximum allowances set aside for CFB’s Emission trading prohibitions