TOXECON Clean Coal Demonstration for Mercury and MultiPollutant Control October 04, 2007 - PowerPoint PPT Presentation

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TOXECON Clean Coal Demonstration for Mercury and MultiPollutant Control October 04, 2007

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Title: TOXECON Clean Coal Demonstration for Mercury and MultiPollutant Control October 04, 2007


1
TOXECON Clean Coal Demonstration for Mercury and
Multi-Pollutant ControlOctober 04, 2007
2
TOXECON? - 270 MW Demonstration
  • Presque Isle Power Plant, Marquette MI
  • Units 7-9
  • PRB Coal from Antelope and Spring Creek Mines
  • 53.3M
  • 24.9M DOE
  • 28.5M We Energies
  • 90 Hg Control
  • 70 SO2 Control
  • 30 NOX Control

3
TOXECON Configuration
Presque Isle Power Plant
Hot Side
APH
Coal
4
Schedule Overview
5
Preliminary Mercury Removal Results
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
Economics
8
Economics
  • Capital Costs (2005)
  • 34.4 million, 270 MW
  • 128/kw
  • OM Costs (estimate)
  • 0.81/MWH
  • Hg Removal - 82 pounds/year
  • 16,000/lb Variable
  • 67,000/lb All In

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

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

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
SO2/NOX Reduction Trial Continued
17
SO2/NOX Reduction Trial Continued
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
Upcoming Project Tasks
  • Detune 7-9 Precipitators (2007)
  • Separate Hg from PAC/Ash (2008)

20
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