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Mercury Capture by Fly Ash Carbon Sorbent in a Fixed Bed

This paper presents a computational model using 2-D finite element analysis to study the capture of mercury by fly ash carbon sorbent in a fixed bed. The study aims to understand the behavior and effectiveness of this technology in reducing mercury emissions from coal-fired power plants. The model is validated using experimental data and shows promising results. Further investigation is needed to accurately identify model parameters.

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Mercury Capture by Fly Ash Carbon Sorbent in a Fixed Bed

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  1. Mercury Capture by Fly Ash Carbon Sorbent in a Fixed Bed 2-D Finite Element Computational Modeling Brandie Markley & Onur Mustafaoglu

  2. Project Motivation • EPA’s Clean Air Mercury Rule • Passed March 15, 2005 • Targets coal-fired power plants • Mercury • Toxic • Persistent • Bioaccumulation • Activated Carbon Injection Using Fly Ash • Promising technology • 63% of fly ash produced is disposed in landfills • Inherent properties of fly ash

  3. Statement of the Problem

  4. Governing Equations • The Convection Diffusion Equations • Incompressible Navier-Stokes Equation

  5. Formulation

  6. Results and Observations

  7. Observations-2

  8. Observations-3

  9. Observations-4.1

  10. Observations-4.2

  11. Validation COMSOL breakthrough curve at center of sample tube outlet COMSOL breakthrough curve along the side of the sample tube outlet Actual experimental results

  12. Parametric Study COMSOL breakthrough curve with actual reaction rate COMSOL breakthrough curve with reaction rate increased by 10000 times Experimental data

  13. Conclusion • Velocity develops and mercury breakthrough occurs most quickly at the center of the element • Adsorption through the element behaves as expected • COMSOL is an effective modeling tool for this application • COMSOL data matches experimentally observed results • Further investigation is needed for accurate parameter identification (e.g., force velocity, dynamic viscosity, diffusion coefficient)

  14. Works Cited • U.S. EPA. CLEAN AIR MERCURY RULE (online), March 15, 2005. Available at http://www.epa.gov/air/mercuryrule/. • American Coal Ash Association, 2003 COAL COMBUSTION PRODUCT PRODUCTION AND USE SURVEY (online), Available at http://www.acaa-usa.org/PDF/2003_CCP_Survey(10-1-04).pdf. • Iliuta I, Petre CF, Larachi F, CHEMICAL ENGINEERING SCIENCE 59 (4): 879-888 2004 • Wu YX, Wang X, Ching CB, J. CHEMICAL ENGINEERING & TECHNOLOGY 27 (9): 955-961 2004 • Etc…(the rest of reference list is in the final paper)

  15. Questions?

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