Exploitable results
If the capture of carbon dioxide (CO2) from the flue gases of coal-fired power stations is to be a serious option for reducing greenhouse gases, a viable technology is needed for retrofitting to existing, conventional power stations running on pulverized coal in an oxygen-enriched, recycled flue gas under atmospheric pressure, as a means of generating a CO2-rich gas that could be easily liquefied.
Modifications were designed for adapting an existing test furnace having a single areodynamically air-staged wall-fired burner for pulverized coal combustion. Gottelborn coal was used throughout, being dried, crushed and milled to 75% below 75 micrometres before being conveyed by carbon dioxide (not flue gas) to the burner. Substantial databases exist for the performance and scale-up of the burner and for the combustion characteristics of the coal. Safe procedures were established for the change-over from the start-up situation, where pulverized coal is burnt in air, to the intended running mode where the air is replaced by a mixture of oxygen and recirculated flue gas.
Complementary mathematical modelling studies were performed using the computational fluid dynamics code FLUENT. The criteria used to define the optimum oxygen-recirculated flue gas firing condition were comparable flame stability, flame length, in-flame conditions, heat transfer and combustion efficiency relative to a conventional coal-air flame. A series of experiments were carried out to evaluate these criteria so as to establish the fully-optimized condition.
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