Process and device for cleaning combustion flue gases
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United States of America Patent
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app pub date -
Sep 20, 2006
filing date -
Jul 12, 2001
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Abandoned
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Abstract
The invention relates to a process and a device for the removal of dust, HF, HCl, SO.sub.2, SO.sub.3, heavy metals, heavy-metal compounds, polyhalogenated hydrocarbons and polycyclic hydrocarbons from combustion flue gases by treating the pollutant-containing combustion flue gases with a sorbent in a circulating fluidized bed. The process is characterized in that the sorbent used is a mixture of Ca(OH).sub.2, at least one naturally occurring zeolite and a carbon-containing substance, in that the treatment of the pollutant-containing combustion flue gases with the: sorbent is carried out at from 120 to 180.degree. C. in the presence of water/steam, in that the reactor (3) of the circulating fluidised bed is operated at a gas velocity of from 2 to 10 m/s, a mean residence time of the solids particles in the case of a single pass of from 1 to 10 seconds, and a solids circulation rate of from 10 to 100, where the gas/solid suspension present in the reactor (3) has a mean suspension density of from 1 to 10 kg of solid/Nm.sup.3 of flue gas, and in that the removal of the loaded sorbent is carried out by filtration.
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