Arsenical Transform And Control Technology In The Process Of Coal-fired Power Plant

The environment can be polluted by trace arsenic in coal combustion. The distribution, and mode of occurrence in the coal, the produced mechanism, characteristic of separated out and rule of transform of arsenic are studied in this paper. The method of theory and simulation are adopted. Different forms of arsenic are existed at different temperature. The study on the distribution of arsenic in coal burnt products has shown that arsenic is dispersed in bottom ash, but enriched in fly ash, particularly on the surface of small fly ash grains, little discharged into air. It has much potential of reduce arsenic pollution that enhancing the dust removal efficiency. The temperature in desulphurization system relative is quite low and this is favor for the arsenic absorption. The arsenic pollution control of coal-burnt power plant should focus on the optimized disposition of dust removal and desulphurization.