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Heat rate improvement and emission reduction via combustion optimization

Heat rate improvement and emission reduction via combustion optimization. 16 th International energy and environmental technology systems conference May 12 -14, 2010 İstanbul, TÜRKiYE. Harun Bilirgen, Ph.D. Lehigh University Energy Research Center Bethlehem, PA 18015, USA.

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Heat rate improvement and emission reduction via combustion optimization

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  1. Heat rate improvement and emission reduction via combustion optimization 16th International energy and environmental technology systems conference May 12 -14, 2010 İstanbul, TÜRKiYE Harun Bilirgen, Ph.D. Lehigh University Energy Research Center Bethlehem, PA 18015, USA

  2. Combustion Optimization Involves modifications to boiler operating parameters to achieve desired optimization goal, subject to imposed constraints Cost-effective alternative to hardware modifications for emissions reduction and performance improvement Maximize effectiveness of existing hardware or hardware modifications

  3. Goals Emission reduction such as NOx and Hg Heat rate (Btu/kWh – efficiency) improvement Reduce furnace slagging/fouling

  4. Combustion efficiency

  5. Unit description 125 MW-net Front wall-fired Sub-critical Single reheat 12 low-NOx burners 5 pulverizers Over-fire Air (OFA)

  6. Combustion Tuning CO distribution over the flue gas duct before unit tuning (average CO = 105 ppm, average O2 = 3.1 Percent)

  7. Combustion Tuning CO distribution over the flue gas duct after unit tuning (average CO = 21 ppm, average O2 = 2.9 Percent)

  8. Parametric Testing OFA register position vs. NOx emissions at various economizer O2 levels

  9. Parametric Testing Furnace excess oxygen vs. NOx emissions at various OFA register positions

  10. Parametric Testing Furnace excess oxygen vs. heat rate at various OFA register positions

  11. ANN Architecture Data obtained from parametric tests NOx, Heat rate, CO, FEGT Output Hidden Input

  12. Model verification Measured and predicted NOx vs. test number

  13. Model results for NOx and HR NOx emission and heat rate vs. economizer oxygen level

  14. Optimization Results NOx emissions vs. heat rate map with optimal settings

  15. Optimization Results

  16. Results and recommendations Boiler/combustion optimization is a tool to increase boiler efficiency and reduce emission In general, 30 percent NOx reduction and less than 1.0 percent heat rate improvement Estimated annual saving $500,000/yr Additional benefits; increase unit availability

  17. Turkish power plants • Benefit from the combustion optimization projects • instrumentation • boiler tuning • performance testing • Coal drying

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