The Institute of Energy's Second International Conference on Combustion & Emissions Control

The Institute of Energy's Second International Conference on Combustion & Emissions Control

Proceedings of The Institute of Energy Conference Held in London, UK, on 4–5 December 1995
1995, Pages 7-16
The Institute of Energy's Second International Conference on Combustion & Emissions Control

COAL SELECTION FOR NOx REDUCTION IN PULVERISED FUEL COMBUSTION

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A major factor affecting a coal's performance in air-staged low-NOx burners is the amount of nitrogen remaining in the char after devolatilisation. Current standard proximate devolatilisation tests do not apply realistic heating conditions for PF combustion, but a recently-developed high-temperature wire-mesh reactor now allows relatively simple captive-sample measurements at heating rates of 104 K/s. Char nitrogen data is reported for devolatilisation temperatures from 400°C to 1800°C, including values for a range of UK and world-traded coals for which NOx measurements from three full-scale low-NOx utility plants and/or a pilot combustor are available. The most general correlation between char nitrogen and combustion NOx is observed for a peak preparation temperature of 1800°C with 0.15 s (or 2 s) hold time or 1600°C with 2 s hold, conditions which give the maximum release of nitrogen from the char.

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