Article Number 200102, March 2001

FULL SCALE MEASUREMENTS AND MATHEMATICAL MODELLING STUDIES FOR THE INVESTIGATION OF THE COMBUSTION BEHAVIOUR OF A MODERN BITUMINOUS COAL-FIRED BOILER
T. Sabel¹, B. Risio¹, S. Unterberger¹, U. Schnell¹, K.R.G. Hein¹, M.Käß², U. Pries-meier³, H.-U. Thierbach³

^{1 University of Stuttgart, Institute of Process Engineering and Power Plant Technology
(IVD), Germany.
2 Neckarwerke Stuttgart AG, Kraftwerk Altbach/Deizisau, Germany
3 Babcock Steinmüller Gummersbach, Germany}

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ABSTRACT:

This paper reports results of an extensive measurement campaign carried out in a 730 MWth bituminous coal fired utility boiler equipped with internally air-staged low-Nox burners. The main objective of the project was to investigate the combustion be-haviour of two different coals under full load conditions. Middle and a high volatile bituminous coal were used during the campaign.

The measurements were carried out in the near-burner zone and in the burnout zone above the over-fire air injection. Particle velocities and temperatures of particle clouds were measured using newly developed non-intrusive probes applying 2-dimensional Laser Doppler Anemometry for velocities and Quotient Pyrometry for temperatures of particle clouds. Gas composition (O2, CO, CO2, and NO) and temperature were deter-mined with conventional suction probes.

The measurement data were then used to validate predictions of an in-house developed CFD code, AIOLOS, of the Institute of Process Engineering and Power Plant Technology (IVD). Gas composition, temperature and velocity distributions in the boiler were calculated with a discretisation of 2,300,000 grid points. The comparison of measured data and predicted results shows a good agreement.

Key Words: Combustion behaviour, bituminous coal, full scale measurements, Laser Doppler Anemometry, Quotient Pyrometry, mathematical modelling.