Abstract
The combustion chemistry looks deceptively simple: Everybody knows that fire consumes fuel and releases heat. For many practical purposes, the burning of oil or gas can be satisfactorily described. However, this equation violates the law of mass preservation. The chemical reactions during combustion are very complex. Every scientist who begins to study combustion and flame chemistry has to overcome the instinctive hurdles connected with the study of a phenomenon that is so deeply tied to emotions. Sulfur can be removed at any of four process stages by cleaning of coal, extraction from fuel gases, extraction during combustion, and extraction from combustion gases. However, all methods have been tried and not all are equally successful. Neither coal is a homogenous material nor is coal a well defined term. It constitutes a continuous range of materials because the geological coal formation involves a continuing series of changes during which peats are step-wise degraded to lignites, bituminous coal, and finally to anthracites.
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