Title: 96/06661 NO release from the isothermal combustion of coal chars
Abstract: Coal combustion for power generation has associated environmental problems, in particular, the release of oxides of sulphur and nitrogen which are involved in the formation of acid rain. The modification and optimization of the combustion process to minimize the NO{sub x} emissions is therefore of considerable interest and importance. The combustion of coal occurs over two stages; (1) the rapid devolatilisation followed by combustion/ignition of the volatiles and (2) slower gasification of the residual char. The nitrogen present in the coal is partitioned between the volatile matter and the residual char. Char nitrogen has been identified as the main contributor to NO emissions from low NO{sub x} burners. Previous work on the gasification of char nitrogen concentrated on temperature programmed conditions and possible mechanisms of the release of nitrogen. Carbons derived from polynuclear heterocyclic aromatic hydrocarbons with well defined initial functionality and isotopic carbon ({sup 13}C) were also used as models for char gasification. In the present investigation, the release of NO during isothermal combustion of a suite of coal chars produced from a rank series of coals in an entrained flow reactor under conditions similar to those in pulverized fuel combustion systems was studied. The relationships between coal andmore » char structural characteristics and NO release were investigated.« less
Publication Year: 1996
Publication Date: 1996-11-01
Language: en
Type: article
Indexed In: ['crossref']
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