Method of removing mercury from a mercury-containing flue gas
AssigneeL. & C. Steinmuller GmbH
InventorsJürgen Rosenthal, Wolfgang Schüttenheim, Marton Klein, Rüdiger Heidrich, Ulrich Nikolai, Uwe Soldner
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Abstract
A method of removing mercury from a mercury-containing flue gas, especially flue gas from a refuse incinerator, is provided. The mercury-containing flue gas may also contain dust, further heavy metals, and further gaseous noxious gas components. The mercury, using an alkali sulfide solution, especially sodium sulfide solution, and in particular sodium tetrasulfide solution, is converted to mercury sulfide and the mercury sulfide is precipitated out via a dust separator. The alkali sulfide solution is introduced into the flue gas accompanied by the simultaneous addition of heat.
Claims19
A method of removing mercury from a mercury-containing flue gas that may also contain dust, further heavy metals, and further gaseous noxious gas components, said method including the steps of:
- providing an alkali sulfide solution;
- heating said alkali sulfide solution to a temperature between about 100-200° C.;
- introducing into said flue gas, which is below 300° C., said heated up alkali sulfide solution to convert mercury to mercury sulfide;
- and
- precipitating out said mercury sulfide.
A method of removing mercury from a mercury-containing flue gas that may also contain dust, further heavy metals, and further gaseous noxious gas components, said method including the steps of:
- providing an alkali sulfide solution;
- heating said alkali sulfide solution to a temperature between about 100-200° C. with an auxiliary fluid;
- introducing into said flue gas, which is below 300° C., said heated up alkali sulfide solution, together with said auxiliary fluid, to convert mercury to mercury sulfide;
- and
- precipitating out said mercury sulfide.
A method of removing mercury from a mercury-containing flue gas that may also contain dust, further heavy metals, and further gaseous noxious gas components, said method including the steps of:
- providing an alkali sulfide solution;
- heating said alkali sulfide solution by about 100-200° C.;
- introducing into said flue gas, which is below 300° C., said heated up alkali sulfide solution to convert mercury to mercury sulfide;
- and
- precipitating out said mercury sulfide.
A method of removing mercury from a mercury-containing flue gas that may also contain dust, further heavy metals, and further gaseous noxious gas components, said method including the steps of:
- providing an alkali sulfide solution;
- heating said alkali sulfide solution to a temperature between about 40-200° C.;
- introducing into said flue gas, which is below 300° C., said heated up alkali sulfide solution to convert mercury to mercury sulfide;
- and
- precipitating out said mercury sulfide.
A method of removing mercury from a mercury-containing flue gas that may also contain dust, further heavy metals, and further gaseous noxious gas components, said method including the steps of:
- providing an alkali sulfide solution;
- heating said alkali sulfide solution to a temperature between about 40-200° C. with an auxiliary fluid;
- introducing into said flue gas, which is below 300° C., said heated up alkali sulfide solution, together with said auxiliary fluid, to convert mercury to mercury sulfide;
- and
- precipitating out said mercury sulfide.
Dependencies are inferred from the claim text.