环缝洗涤装置在宝钢4#高炉的应用实践

Application of Annular Gap Scrubber(AGS) in Baosteel No.4 Blast Furnace

介绍了宝钢分公司4#高炉环缝清洗煤气的工艺流程及环缝洗涤装置的结构。从流体力学的角度阐述环缝不易磨损的机理。环缝洗涤装置的结构使气流在环缝内的分布更均匀,形成较小的速度梯度,产生的摩擦阻力小;直径更小的雾化水粒能有效捕集尘粒。运用理论结合生产实绩分析说明了环缝洗涤装置具有水气比低、压损小、除尘效率高的特点,环缝洗涤装置的水气比较二级文氏串联工艺低7.6%,压损率小0.89%。经环缝洗涤后的净煤气含尘量及含水量低,这有利于减少对用户设备的影响,减少向大气排尘,有利于环保。

The technological flow of the AGS on Baosteel Branch＇ s No. 4 BF and its structure are introduced. The mechanism of that the AGS can not be worn out easily is explained in terms of hydromechanics. It is the structure of the AGS that makes the airflow＇ s distribution in the AGS more uniform, forming a minor speed gradient and producing a smaller frictional resistance. Finer atomized water drips can effectively catch dust grains. An AGS has characteristics of low ratio of water to gas, minor press loss and high dedusting efficiency. All these are shown through analyzing the production achievements in combination with the theory. Compared with the double Venturi Series （VS） process, the AGS＇ ratio of water to gas is decreased by 7.6% and press loss decreased by 0. 89%. After treatment with the AGS, the clean gas contains less dust and moisture, which is beneficial to users＇ equipment and environment protection due to the reduced dust emission.