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This study assesses the effects of a wide range of operating parameters on NO(x) formation and evaluates techniques for reduction of NO(x) emissions from pressurised fluidised bed combustion (PFBC) systems. The level of excess air is shown to be the dominant parameter, although fluidisation conditions may also be important, as may the bed temperature. In terms of the overall PFBC combined cycle, staging at the bed surface gives the best results, since some 65% reduction in NO(x) levels can be achieved without adverse effects on the off-gas temperature or combustor performance. Studies of the use of ammonia injection have been undertaken in parallel with the staged combustion trials. The effectiveness of this technique is strongly dependent on injection location, on gas temperature and on the composition of the gas/solid streams. The implications for a commercial plant are that while staged combustion may be effective for full-load conditions, at part-load ammonia injection may be a better technique for NO(x) control.

Additional information

Authors: MINCHENER A J, British Coal Corporation, Coal Research, Cheltenham (GB);KELSALL G J, British Coal Corporation, Coal Research, Cheltenham (GB)
Bibliographic Reference: EUR 13051 EN (1990) 125 pp., MF, ECU 8
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