| 摘要 |
Between the recovery heater and the dust extractor, the fumes are desulfurized by semi-wet method in a reaction vessel (4) with water injected (5). Downstream of the dust extractor, the desulfurization products are oxidized by mixing with circulating solids (10) from the bottom of the cyclone, in at least one dense fluidized bed (9) outside the foyer before being reinjected into the foyer Process for reducing sulfur oxide emissions in a combustion installation with a circulating fluidized bed, which has a foyer (1) in which the dust is at least partially recovered by a cyclone (12). The partially cleaned gas leaving the cyclone passes through a recovery heater (3) and then a dust extractor (7). A desulfurizing agent is introduced in the foyer. The circulating solids are also taken from downstream of the recovery heater in a second dust extractor (15) to maintain a correct inventory of solids circulating in the circulating fluidized bed. A complementary injection of desulfurizing agent is made into or upstream of the reaction vessel. The complementary desulfurizing agent is a chalk milk, which is injected after it has been heated to a controlled temperature. Nitrogen oxide (NOx) emissions are reduced by increasing the temperature in the foyer and using the above process. Installation for carrying out the above process. An Independent claim is included for the combustion installations.
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