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TOXECON Clean Coal Demonstration for Mercury and Multi-Pollutant Control October 04, 2007

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TOXECON Clean Coal Demonstration for Mercury and Multi-Pollutant Control October 04, 2007

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    1. 1 TOXECON Clean Coal Demonstration for Mercury and Multi-Pollutant Control October 04, 2007

    2. 2 TOXECON? - 270 MW Demonstration Develop an integrate mercury and particulate matter emissions control system Also will evaluate strategy to reduce emissions of SO2 and NOX by more that 65% Develop an integrate mercury and particulate matter emissions control system Also will evaluate strategy to reduce emissions of SO2 and NOX by more that 65%

    3. 3 TOXECON Configuration

    4. 4 Schedule Overview

    5. 5 Preliminary Mercury Removal Results This is at the original 6.5 inches W.C. baghouse delta P setpoint.This is at the original 6.5 inches W.C. baghouse delta P setpoint.

    6. 6 Mercury Removal Parameters Norit HG set point 2.5 lb/MCF Norit LH set point 1.5 lb/MCF Trim +/- 20% to maintain 91% Hg removal Use LH in summer months (less temperature effect)

    7. 7 Economics

    8. 8 Economics Capital Costs (2005$) $34.4 million, 270 MW $128/kw O&M Costs (estimate) $0.81/MWH Hg Removal - 82 pounds/year $16,000/lb Variable $67,000/lb All In

    9. 9 Current Balance of Plant Issues Spontaneous Combustion Ash/PAC Handling

    10. 10 Spontaneous Combustion Operational changes have successfully prevented problems Ensuring complete emptying of ash hoppers Minimizing ash/PAC residence time (4 hours) Adding test installation of hopper CO monitor

    11. 11 Mechanism for Spontaneous Combustion Laboratory tests confirm spontaneous combustion follows Frank-Kamenetskii Model Key Factors Bed size Temperature surrounding bed LOI Type of LOI (high vs. low surface area) Gas oxygen concentration

    12. 12 Material Handling Issues Ash Silo Filter Separator Short bag life Opacity from bag bleed-thru Solutions being pursued Alternate bag materials Adjusting pulse frequency RTV cones to tube sheet

    13. 13 Material Handling Issues Cont. Ash Silo Wet Unloader Uncontrolled dusting during start up Recent test of a vacuum vent line was successful Increased speed of mixer Solutions being pursued

    14. 14 RATA Testing June 2007: Presque Isle Ontario Hydro Method Sorbent Trap Instrumental Reference Method Passed high level (1.5 to 3.2 g/m3) OH to CEM STM to CEM IRM to CEM Passed low level (0.48 to 0.93 g/m3) STM to CEM IRM to CEM

    15. 15 SO2/NOX Reduction Trial The SO2 level decreased by 70% with trona injection. Trona injection decreased the effectiveness PACs ability to remove Hg. No ash unloading issues caused by trona injection. ADA.ES is evaluating the financial feasibility of permanent Trona injection.

    16. 16 SO2/NOX Reduction Trial Continued

    17. 17 SO2/NOX Reduction Trial Continued

    18. 18 What We Learned So Far Carbon injection effectively removes mercury Standard activated carbon is sensitive to temperature at low injection concentrations Bag cleaning based on time reduces temperature sensitivity PAC/ash mixture can ignite with sufficient time and quantities at temperatures above 400 ?F Special ash unloading equipment is needed when handling PAC/ash mixtures with high carbon %. Trona injection can reduce SO2 by 70%

    19. 19 Upcoming Project Tasks Detune 7-9 Precipitators (2007) Separate Hg from PAC/Ash (2008)

    20.

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