B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/34 (2006.01) B01D 53/50 (2006.01)
Patent
CA 2064210
2064210 9101174 PCTABS00003 The invention relates to a process for the purification of flue gases by feeding (7) limestone into the furnace (1) of a boiler, by separating (3) the dusts from the flue gases at a point after the furnace, by hydrogenating (14) the separated dust, which contains calcium oxide, by returning (12, 13) it to the flue-gas flow (11) at a point after the separation point but before the reaction zone (4), in which additional water or vapor is fed (15) into the dust-bearing flue gas, whereafter the dust which contains sulfated calcium hydroxide is separated (5) from the flue gases (6) thus purified. According to the invention, the hot, dust-bearing flue gas coming from the furnace is divided in the separation zone (3) into a dust-poor main flow (11) and a dust-rich secondary flow (12), vapor or water mist (14) being fed into the secondary flow at a point at which the temperature of the secondary flow is 300-600 ·C. The invention also relates to an apparatus, such as a cyclone, intended for use in this process and having nozzles (19) for feeding in steam or for atomizing water, and a connecting duct (12) between the separation device (3) and the flue-gas duct (11) for the purpose of making the activated dust-rich secondaryflow of flue gas to join the dust-poor main flow at a point after the cyclone (3).
Enwald Tarja
Hamala Sirpa
Kenakkala Timo
Kokkonen Kari
Pokki Tuomo
Enwald Tarja
Hamala Sirpa
Kenakkala Timo
Kokkonen Kari
Oy Tampella Ab
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