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Design and evaluation of coal burners

Objective

To develop and assess advanced numerical and electro-optical techniques, which will be used for the evaluation of combustion characteristics of solid fuels in single and multiple burners.

To produce a reliable and well-tested predictive method, which will be of aid to the designers of coal burners.

The experimental program, includes:

Improvement of measuring techniques of coal particle size by the use of amplitude and phase of laser-doppler velocity-meter signals.

Development of pyrometry to measure temperature, simultaneously with velocity and size characteristics of individual coal particles, resulting in the creation of a multi-purpose laser-doppler velocity-meter.

Measurements of stability and local velocities, temperatures and turbulence characteristics in a range of coal flames in burners with low swirl.

Measurements in assembled arrays of burners, used to simulate axial and tangential firing, and quantify the resulting interference effects.

The tasks of the numerical research can be summarized as follows:

Development of a calculation method for three-dimensional burner arrays, by extension of the existing two-dimensional algorithm. Assessment and correction of probable numerical errors.

Improvements of the two-phase flow model, of the coal chemistry and de-volatilisation models and incorporation of appropriate numerical models for the representation of NOx production and vapour content distribution.

Use of the calculation method for the study of physical constants of pulverized coal (i.e. particle diameter distribution, swelling, etc.) and of operational and geometrical parameters of large utility boilers (i.e. angle of particle injection, fuel distribution between upper and lower burners, ratio of coal to lignite in the P.P.C. boilers, etc.)

Use of the calculation method for the identification of new burner arrangements which can operate on minimum imposed swirl and need only a short distance for the completion of combustion of coal particles.

Coordinator

NATIONAL TECHNICAL UNIVERSITY OF ATHENS
Address
Iroon Polytechnioy 5
15780 Athens
Greece

Participants (1)

IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
United Kingdom
Address
South Kensington Campus
London