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Title:

Application of an Empirical Model in CFD Simulations to Predict the Local High Temperature Corrosion Potential in Biomass Fired Boilers

Author(s):

Gruber, T., Scharler, R., Obernberger, I.

Document(s):

Paper Paper

Slide presentation Slide presentation

Abstract:

To gain reliable data for the development of an empirical model for the prediction of the local high temperature corrosion potential in biomass fired boilers, online corrosion probe measurements have been carried out. The measurements have been performed in a specially designed fixed bed / drop tube reactor in order to simulate a superheater boiler tube under well-controlled conditions. The investigated boiler steel 13CrMo4-5 is commonly used as steel for superheater tube bundles in biomass fired boilers. Within the test runs the flue gas temperature at the corrosion probe has been varied between 625 and 880 °C, while the probe surface temperature has been varied between 450 and 550 °C to simulate typical current and future live steam temperatures of biomass fired steam boilers. To investigate the dependence on the flue gas velocity, variations from 2 to 8 m/s have been considered. The empirical model developed fits the measured data sufficiently well. Therefore, the model has been applied within a Computational Fluid Dynamics (CFD) simulation of flue gas flow and heat transfer to estimate the local corrosion potential of a wood chips fired 38 MW steam boiler. Additionally to the actual state analysis two further simulations have been carried out to investigate the influence of enhanced steam temperatures and a change of the flow direction of the final superheater tube bundle from parallel to counter-flow on the local corrosion potential.

Keywords:

biomass, combined heat and power generation (CHP), corrosion, wood chips, model

Topic:

Biomass Conversion Technologies for Heating, Cooling and Electricity

Subtopic:

Solid biofuels combustion in large utilities

Event:

22nd European Biomass Conference and Exhibition

Session:

2AO.7.2

Pages:

402 - 408

ISBN:

978-88-89407-52-3

Paper DOI:

10.5071/22ndEUBCE2014-2AO.7.2

Price:

FREE