EP 0765187 A4 19970910 - IMPROVED WET SCRUBBING METHOD AND APPARATUS FOR REMOVING SULFUR OXIDES FROM COMBUSTION EFFLUENTS
Title (en)
IMPROVED WET SCRUBBING METHOD AND APPARATUS FOR REMOVING SULFUR OXIDES FROM COMBUSTION EFFLUENTS
Title (de)
VERBESSERTE AUSWASCHMETHODE UND VORRICHTUNG ZUM ENTFERNEN VON SCHWEFELOXYDEN AUS VERBRENNUNGSABGASEN
Title (fr)
PROCEDE ET APPAREIL PERFECTIONNES D'EPURATION PAR VOIE HUMIDE POUR ELIMINER DES OXYDES DE SOUFRE CONTENUS DANS DES EFFLUENTS DE COMBUSTION
Publication
Application
Priority
- US 9507167 W 19950607
- US 25716094 A 19940609
- US 25769894 A 19940609
Abstract (en)
[origin: WO9533547A1] Sulfur oxides (SOx) are scrubbed from combustion effluents with aqueous limestone slurries single-loop, open-tower countercurrent limestone wet scrubbers. Effluent flow rates are greatly increased while L/G values and reaction tank (150) residence times are decreased. Improved entrainment eliminator design, nozzle (112) placement and spacing, and the use of a hydrocyclone (181) to separate and recycle smaller particles of limestone from the byproduct gypsum, facilitate these advantages. Limestone is reduced to very fine particles, e.g. about 8 mu or less with more than 99 % of the particle by weight less than 44 mu , and introduced into a scrubbing slurry which is contacted with SOx-laden effluent. Reactivity of the scrubbing slurry is maintained, even at reduced pH, by continuously operating a hydrocyclone to assure a molar ratio of calcium-containing to sulfur-containing compounds of greater than about 1.3 to 1 while keeping both a low chloride and low non-reactive solids content. The hydrocyclone removes large particles of calcium sulfate and provides a recycle stream (184) of fine calcium carbonate and non-reactive solids which is bled off as necessary to maintain both the desired low chloride and non-reactive solids levels.
IPC 1-7
IPC 8 full level
B01D 53/34 (2006.01); B01D 53/50 (2006.01); B01D 53/74 (2006.01); B01D 53/78 (2006.01); B01D 53/80 (2006.01); B01F 33/40 (2022.01); B01J 10/00 (2006.01); F23J 15/00 (2006.01); F23J 15/04 (2006.01); F27B 19/00 (2006.01)
CPC (source: EP KR)
B01D 53/50 (2013.01 - KR); B01D 53/501 (2013.01 - EP); B01D 53/502 (2013.01 - EP); B01D 53/504 (2013.01 - EP); F23J 15/006 (2013.01 - EP); F23J 15/04 (2013.01 - EP); F23J 2215/20 (2013.01 - EP); F23J 2217/102 (2013.01 - EP); F23J 2219/40 (2013.01 - EP)
Citation (search report)
- [XY] WO 8901820 A1 19890309 - GEBHARD GEORG [DE]
- [Y] EP 0262396 A2 19880406 - HOELTER HEINZ [DE]
- [A] EP 0212523 A2 19870304 - GEN ELECTRIC [US]
- [A] EP 0246758 A2 19871125 - BABCOCK HITACHI KK [JP]
- See references of WO 9533547A1
Designated contracting state (EPC)
AT DE DK ES GB GR IT NL PT SE
DOCDB simple family (publication)
WO 9533547 A1 19951214; AU 2943295 A 19960104; BG 101099 A 19971031; BG 63154 B1 20010531; BR 9507951 A 19970902; CA 2190868 A1 19951214; CZ 353396 A3 19970514; EP 0765187 A1 19970402; EP 0765187 A4 19970910; FI 964891 A0 19961205; FI 964891 A 19961205; GE P20002319 B 20001225; HU 221181 B1 20020828; HU 9603356 D0 19970228; HU T77896 A 19980928; KR 970703798 A 19970809; PH 31493 A 19981103; PL 317931 A1 19970428; RU 2149679 C1 20000527; SI 9520071 A 19970630; SK 151696 A3 19970806; TW 349876 B 19990111
DOCDB simple family (application)
US 9507167 W 19950607; AU 2943295 A 19950607; BG 10109997 A 19970103; BR 9507951 A 19950607; CA 2190868 A 19950607; CZ 353396 A 19950607; EP 95925239 A 19950607; FI 964891 A 19961205; GE AP1995003524 A 19950607; HU 9603356 A 19950607; KR 19960707118 A 19961209; PH 50689 A 19950608; PL 31793195 A 19950607; RU 97100158 A 19950607; SI 9520071 A 19950607; SK 151696 A 19950607; TW 84105890 A 19950609