EES Annual Seminar EES Annual Seminar 11.3.201311.3.2013

InnopoliInnopoli 1, Otaniemi, 1, Otaniemi, EspooEspoo

Progress Report

Georgios Kanellis

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

Contents of the presentation

•About the PhD

•Working in the 1st year

•Goals for the 2nd year

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EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

About the PhD

–Title: “Optimization Methods with CFD in Two Biomass-Based Boiler Environments”–The aim is to optimize (~minimize) nitric oxide (NO) and ammonium (NH3) as well as carbon monoxide (CO) emissions both in bubbling fluidized bed (BFB) and in kraft recovery (KR) boilers environments. –The design variables are:the amounts of the NH3 feedsamounts and locations of air feeds–The use of computational fluid dynamics (CFD) together with mathematical optimization algorithms, i.e. multiobjective optimization, is the main principle to reach the goal.

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EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

The two boilers

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EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

Working in the 1st year•Run of the BFBB case using ANSYS FLUENT in parallel.

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FLUENT

Temperature field inside the Boiler (K)

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

• NOx Modeling

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• Duo Model for the SNCR,EDCM Model for chemistry-turbulence interaction.

• Brink - Duo Model for the SNCR, EDCM Model for chemistry-turbulence interaction.

• Brink - Duo Model for the SNCR, EDC Model for chemistry-turbulence interaction.

NO mol fraction

exp

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

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• Duo Model for the SNCR,EDCM Model for chemistry-turbulence interaction.

• Brink - Duo Model for the SNCR, EDCM Model for chemistry-turbulence interaction.

• Brink - Duo Model for the SNCR, EDC Model for chemistry-turbulence interaction.

NH3 mol fraction

exp

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

• Developing the OpenFOAM solver Begin from calculating simpler cases Solved the non – reactive, compressible flow equations

taking into consideration turbulence and radiation. Used the typical SIMPLE velocity – pressure coupling

combined with the local time stepping technique for accelerating convergence.

Modeled the species properties (polynomial approximation for Cp, κ, μ)

Currently modeling the reactive flow.

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EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

• OpenFOAM results in comparison with FLUENT

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FLUENT

OpenFOAM

Velocity Magnitude Field (m/s)

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

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OpenFOAM

Turbulent Kinetic Energy K (m2/s2)

FLUENT

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

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Turbulent Energy Dissipation Rate ε (m2/s3)

OpenFOAM

FLUENT

EES Annual Seminar 11.3.2013EES Annual Seminar 11.3.2013

Goals for the 2nd year•Complete the OpenFOAM solver for the BFBB.•Implement EDC in OpenFOAM and use it for the prediction of NOx .•Predict accurately both the NO and ammonia emissions.•Start the optimization process for the BFBB.

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