Flue gas dry detoxification, esp. desulphurisation plant - with fluidised bed of solid absorbent across gas path after combustion zone

摘要

Plant for the dry detoxification, esp. desulphurisation of boiler flue bases uses granulated solid absorbent(s) (I), e.g. Ca and/or Mg carbonate, which is contacted with the gas and then removed and replaced by fresh (I). Improvement is that a circulating fluidised bed and/or fluidised bed impinged with (I), completely filling the cross-section of the gas, is provided in the discharge direction after the combustion zone in a boiler zone with a flue gas temp. of ca. 700-900 deg.C. The plant allows the combustion of contaminated and hence cheaper but otherwise high grade solid, liq. and gaseous fuels unaffected by additives or absorbents, without environmental pollution.