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    • 114. 发明申请
    • METHOD OF TREATING AN OFF-GAS STREAM AND AN APPARATUS THEREFOR
    • 处理关闭气流及其装置的方法
    • WO2010115871A1
    • 2010-10-14
    • PCT/EP2010/054507
    • 2010-04-06
    • SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.SCHREUDER, Sandra
    • SCHREUDER, Sandra
    • B01D53/14B01D53/52B01D53/75C02F3/02C10K1/12C10L3/10B01D53/50
    • B01D53/1456B01D53/50B01D53/526B01D53/75B01D2257/308B01D2257/406C10J2300/0909C10J2300/093C10J2300/1681C10K1/00C10K1/003C10K1/12Y02P20/152
    • The present invention provides a method of treating an off-gas stream (80) comprising NH 3 and H 2 S to provide a sulphate stream (910), the method comprising the steps of : (i) providing a first off-gas stream (80) comprising NH 3 , H 2 S, CO 2 and optionally one or more of HCN, COS and CS 2 ; (ii) passing the first off-gas stream (80) to an incinerator (300) to oxidise NH 3 , H 2 S, and optionally one or more of HCN, COS and CS 2 to provide a second off-gas stream (310) comprising N 2 , H 2 O, SO 2 and CO 2 ; (iii) scrubbing the second off-gas stream (310) with a first aqueous alkaline stream (380, 876a) in a caustic scrubber (350) to separate SO 2 and a part of the CO 2 from the second off-gas stream to provide a spent caustic stream (360) comprising carbonate and one or both of sulphite and bisulphite and a caustic scrubber off-gas stream (370) comprising N 2 and CO 2 ; and (iv) passing the spent caustic stream (360) to an aerator (900) comprising sulphur-oxidising bacteria in the presence of oxygen to biologically oxidise sulphite and bisulphite to sulphate to provide a sulphate stream (910).
    • 本发明提供了一种处理包含NH 3和H 2 S的废气流(80)以提供硫酸盐流(910)的方法,所述方法包括以下步骤:(i)提供第一废气流(80),其包括 NH 3,H 2 S,CO 2和任选的一种或多种HCN,COS和CS2; (ii)将第一废气流(80)通过焚化炉(300)以氧化NH 3,H 2 S以及任选的一种或多种HCN,COS和CS2以提供包含N 2的第二废气流(310) H2O,SO2和CO2; (iii)用苛性碱洗涤器(350)中的第一含水碱性物流(380,876a)洗涤所述第二尾气物流(310)以从所述第二废气流分离SO 2和一部分CO 2以提供 包含碳酸盐和一种或两种亚硫酸盐和亚硫酸氢盐的废碱流(360)和包含N 2和CO 2的苛性洗涤器废气流(370); 和(iv)在氧气存在下将废碱流(360)传递到包含硫氧化细菌的曝气器(900),以生物氧化亚硫酸盐和亚硫酸氢盐至硫酸盐以提供硫酸盐流(910)。