Title:
Slagging Prevention and Plant Optimisation by Means of Numerical Simulation
Author(s):
Plankenbühler, T., Müller, D., Karl, J.
Document(s):
Paper
Poster
Abstract:
The Chair of Energy Process Engineering at Friedrich-Alexander-University Erlangen-Nuremberg (FAU-EVT) developed a CFD simulation framework for biomass boilers in the megawatt range. The main focus lies on a methodology for the prediction of slagging and fouling which is implemented as a post processor. A stand-alone software tool provides boundary and inlet conditions for grate and fluidised bed combustors in consideration of mass-, elemental/species- and energy balance. Combustion, radiation and turbulence are simulated my means of state of the art models. In addition to gas phase combustion (the Eulerian phase), discrete trajectories of burning fuel fine particles are calculated. When certain (fuel-dependent) sticking criteria for these char/ash particles are fulfilled, slagging phenomena occur. Our results of simulated depositions in several biomass power plants could be verified for each case during inspection works. We use this simulation framework for the optimisation of existing combustion chambers, aiming for the avoidance of depositions for current and alternative biomass fuels. This conference contribution gives a brief overview of our CFD modelling framework for combustion and slagging simulation in grate and fluidised bed biomass boilers in the megawatt range. Afterwards, we discuss the influence of ash melting temperature and possible plant optimisation measures like changing the height of the refractory lining or adapting the air staging, reviewing their influence on the occurrence of depositions. These actions can help to increase the fuel flexibility of existing plants as well as lowering the risk of unscheduled furnace downtimes and maintenance works.
Keywords:
combustion, slagging, ashes, CFD, simulation
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Biomass Combustion in Large Utilities
Event:
25th European Biomass Conference and Exhibition
Session:
2BV.1.41
Pages:
653 - 659
ISBN:
978-88-89407-17-2
Paper DOI:
10.5071/25thEUBCE2017-2BV.1.41
Price:
FREE
