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固阀塔板对煤气化飞灰洗涤净化性能的实验研究

, PP. 31-38

Keywords: 整体煤气化联合循环发电(IGCC),水洗塔,固阀塔板,洗涤效率,煤气化飞灰

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Abstract:

以煤气化飞灰、空气、水为实验介质,研究了固阀塔板的洗涤特性。通过改变洗涤塔入口和塔内操作条件观察其对洗涤效率的影响规律。实验结果表明气量、液量、颗粒浓度以及塔板数对不同粒径飞灰颗粒的洗涤效率均有较大的影响;固阀塔板对大于10??m的飞灰颗粒洗涤效率可以达到90%以上,随着粒径的降低洗涤效率逐渐降低,颗粒粒径在1~3??m之间洗涤效率最低为52%左右;低于1??m的颗粒,随着粒径的降低洗涤效率逐渐升高。不同粒径飞灰颗粒的洗涤效率随气量增加呈现不同的变化趋势,其中3??m以上颗粒的洗涤效率随气量的增加而增大;而1??m以下颗粒的洗涤效率随着气量的增加,洗涤效率逐渐降低;介于1~3??m间的颗粒洗涤效率受气量变化影响较小。不同粒径颗粒的洗涤效率随液量的增加均增大;随入口颗粒浓度增加,5??m以上颗粒洗涤效率略有增加,但3??m以下颗粒随入口颗粒浓度的增加洗涤效率却显著降低,介于3~5??m之间的颗粒洗涤效率变化不大。各层塔板对飞灰颗粒洗涤效率的贡献不同,且在不同层塔板上洗涤效率随粒径变化的趋势也有较大的差异。利用实验结果拟合出预测板式塔洗涤效率的公式,该公式预测值与实验值相符程度较好。

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