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脱硫塔出口温度对半干湿法烟气脱硫率的影响

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脱硫塔出口温度对半干湿法烟气脱硫率的影响

发布日期:2019-06-12 作者: 点击:

脱硫塔出口烟气温度对脱硫率的影响,又可表示为近绝热饱和温度差对脱硫率的影响。除尘脱硫,在半干法烟气脱硫防腐工艺中,一定湿度和温度的未饱和烟气进入脱硫塔,与雾化轮或喷嘴喷入的石灰浆液液滴相接触,因烟气尚未饱和,水分便不断向烟气中汽化。假设脱硫塔保温良好,既无热损失,也不从外界补充热量。水分汽化所需的潜热只能来自烟气的显热,致使烟气的温度逐渐下降,烟气湿度不断增高。与水汽化等量的热又以潜热形式带回烟气中,因此烟气的热焓不变。另外,整个过程进行的时间也非常短,因此该过程可看成是烟气系统的绝热降温过程。如果给水量充足,当烟气达到饱和时,烟气的温度就不再下降,此相对稳定状态的温度便称为烟气的绝热饱和温度。


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