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Computational Analysis of Water Atomization in Spray Desuperheaters of Steam Boilers

Computational Analysis of Water Atomization in Spray Desuperheaters of Steam Boilers. A Thesis by Paul Bovat. Outline. Background Objectives Main Equations Model Main Results Conclusions Recommendations. Background. What is a desuperheater? What are the components?

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Computational Analysis of Water Atomization in Spray Desuperheaters of Steam Boilers

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  1. Computational Analysis of Water Atomization in Spray Desuperheaters of Steam Boilers A Thesis by Paul Bovat

  2. Outline • Background • Objectives • Main Equations • Model • Main Results • Conclusions • Recommendations

  3. Background • What is a desuperheater? • What are the components? • Common problem with desuperheaters • How is the problem corrected?

  4. Objectives • Determine pressure drop across spray nozzles • Compare to industry standard • Determine final steam temperature • Determine droplet life • Determine full droplet evaporation location

  5. Equations • Turbulent dissipation and kinetic energy equations • Energy equation • Equation for mass diffusion in turbulent flows

  6. Particle inertia Equation (Lagrangianreference frame) • Spherical drag law coefficients • Equations for heat and mass exchange • Film Formation thickness equation

  7. Atomizer spray half-angle • Secondary Break-up • Webber # • Droplet evaporation • Droplet lifetime

  8. Model • ANSYS Fluent CFD • Realizable k-εturbulent model • Energy equation • Species model • Discrete Phase Model • Pressure Swirl Atomizer

  9. Model

  10. Results • Pressure loss across then nozzle • 17% higher results between the empirical and computational results

  11. Results

  12. Results • Desuperheater spray system • Inlet temp of desuperheater 650 deg F • Outlet temp of desuperheater 645.5 deg F • 4.5 deg F reduction in temperature • Total evaporation is ≈1.48ft

  13. 13.5 Results

  14. Results

  15. Conclusion • Pressure drop across nozzle • Limitations of elements • Second Order Up-Wind • Desuperheater temperature • Temperature not regulated enough • Evaporated time is as designed

  16. Recommendations • Re-run pressure drop analysis with more elements • Lower spray water temperature • Increase spray half angle

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