某工厂有2台黑液燃烧锅炉(碱回收炉)、3台35t/h的循环流化床锅炉和3台6000kW的汽轮发电机组。
除尘脱硫系统采用旋风分离器、立式文丘里除尘器及水膜除尘脱硫塔三级除尘脱硫装置(如图1所示),设计除尘效率≥96.7%;设计阻力:旋风分离器400Pa,文丘里除尘器600Pa,水膜除尘脱硫塔800Pa,合计阻力为1800Pa。
厦门岳航计算机工程有限公司
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1、存在问题分析
因除尘脱硫设施在设计时主要只考虑了其除尘效率,其脱硫效率相对偏低,在燃用高硫煤时,为确保其脱硫效果,大量使用稀(浓)白液及氧强化的碱抽提(EO)段碱性废水除尘脱硫后,主要存在烟气带水严重、酸腐蚀及管道结垢、脱硫成本偏高等问题,其主要原因如下。
1.1、烟气带水
结合运行实际,与除尘脱硫系统、锅炉厂家进行了交流和分析,烟气带水原因与系统设计缺陷有一定关系,气、水分离效果不佳,在以前使用清水除尘过程中,就存在烟气带水现象,特别是在水膜除尘脱硫塔投用后烟气带水情况十分明显,因而长时间未投用水膜除尘脱硫塔。
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