硫磺制酸装置干燥塔酸封方式比较

Comparison of Acid Seal Methods for Drying Towers in Sulphur-burning Sulphuric Acid Plants

随着硫磺制酸装置的老化和长时间的运行,系统阻力会越来越大,导致干燥酸循环槽的酸封易冲破。介绍了威顿达州公司800 kt/a硫磺制酸装置和400 kt/a硫磺制酸装置干燥塔分别采用管道式酸封和"U"管式酸封,分析了系统阻力来源和阻力升高的原因,阐述了两种干燥塔酸封工艺流程及其优缺点,分析了影响封酸高度的主要因素,指出透平风机的出口风压是影响酸封的关键性参数,为研究不同的酸封方式对硫磺制酸装置产生的影响提供了实践经验。

With the aging and prolonged operation of the sulphur-burning sulphuric acid plant,the system resistance will increase,which makes the acid seal prone to breaking for the circulating tank of drying acid.It is introduced that the pipe type acid seal is employed for the drying towers of the 800 kt/a and"U"pipe acid seal is employed for the drying towers of the 400 kt/a sulphur-burning sulphuric acid plants,respectively in Wylton Dazhou Chemical Co.Ltd.The source of system resistance and cause of increased resistance are analyzed,and the process flows,advantages and disadvantages of both acid seals for the drying tower are outlined,and major factors which influence the acid seal height are analyzed,and it is pointed out that the discharge air pressure of the turbine fan is a key factor which influences the acid seal,which provides practical experience for the study of influence by different acid seal methods on the sulphur-burning sulphuric acid.