REACTIVATION OF PARTIALLY-SULFATED LIMESTONE PARTICLES FROM A CFB COMBUSTOR BY HYDRATION
REACTIVATION OF PARTIALLY-SULFATED LIMESTONE PARTICLES FROM A CFB COMBUSTOR BY HYDRATION
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DOI：
10.1002/cjce.5450720114
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发表时间：
1994-02-01
影响因子：
2.1
通讯作者：
VOLMERANGE, Y
中科院分区：
文献类型：
--
作者：
COUTURIER, MF;MARQUIS, DL;VOLMERANGE, Y
从22兆瓦循环流化床(CFB)锅炉的床层和布袋中采集的废石灰石样品在热重分析仪上进行水合，然后在与CFB燃烧室相似的条件下(850℃、0.3%SO2、9%O2、9%CO2和81.7%氮气)进行硫酸盐处理。与在150℃和200℃的纯水蒸气中浸泡相比，用水进行水合可以更快地将残余CaO转化为Ca(OH)2，并且转化水平更高。颗粒在水化过程中膨胀，内部体积由水化前的0.1cm3/gCa增加到脱水后的近0.6cm3/gCa。水合作用使床料的反应性恢复活力，但不能使袋子颗粒的反应性恢复活力。在再硫化过程中，处理床颗粒中钙转化为CaSO4的转化率从32%提高到80%以上。
Spent limestone samples from the bed and baghouse of a 22 MWe circulating fluidized bed (CFB) boiler were hydrated and then sulphated in a thermogravimetric analyzer under conditions similar to those found in CFB combustors (850-degrees-C, 0.3% SO2, 9% O2, 9% CO2 and 81.7% N2). Hydration using water gave faster rates and higher levels of conversion of the residual CaO to Ca (OH)2 than immersion in pure steam at 150 and 200-degrees-C. The particles expanded during hydration and their internal volume increased from 0.1 cm3/g Ca before hydration to nearly 0.6 cm3/g Ca after dehydration. Hydration rejuvenated the reactivity of the bed material but not that of the baghouse particles. The conversion of Ca to CaSO4, in the treated bed particles increased from 32% to over 80% during re-sulphation.