Flue gas treating process
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsEiji Ochi, Takeo Shinoda, Toru Takashina, Susumu Okino
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Abstract
The dust concentration of the flue gas leaving an electrostatic precipitator and introduced into an absorption tower of a desulfurizer is adjusted to a level of 100 to 500 mg/Nm.sup.3. At the same time, a dust slurry having a higher dust concentration is separated and withdrawn from the slurry within the aforesaid absorption tower, and then subjected to a solid-liquid separation treatment. Thus, solid matter containing dust at a high concentration is extracted and discharged out of the system of the desulfurizer.
Claims5
A flue gas treating process wherein flue gas is cooled to a temperature of 80 to 110.degree. C. by heat recovery means, introduced into a dry electrostatic precipitator in order to reduce the dust concentration of the flue gas, and then introduced into an absorption tower of a desulfurizer based on the wet lime-gypsum method in order to reduce the sulfur oxide concentration and dust concentration of the flue gas by bringing the flue gas into contact with a slurry containing a calcium compound as the absorbent, said desulfurizer comprising an apparatus selected from the group consisting of a simplified settler, a magnetic dust separator, and both of the above to effect dust removal in the desulfurizer, and the dust concentration of the flue gas leaving said dry electrostatic precipitator and introduced into said absorption tower is adjusted to a level of above 100 to 500 mg/Nm.sup.3.
Dependencies are inferred from the claim text.