西门子高密度沉淀池在煤化工回用水的应用研究

Applied Research on Recycle Water of Coal Chemical Industry in SIEMENS High-density Sedimentation Tank

某煤制烯烃项目回用水装置采用德国西门子公司高密度沉淀池专利技术,该装置自2010年5月底运行至今,曾多次出现影响高密度沉淀池正常运行的严重问题,具体表现为沉淀区产生高浓度黏泥无法正常排出和絮凝区产生积泥破坏絮凝区水动力平衡,最终导致高密度沉淀池出水不合格。为了解决这些难题,经过不断摸索,通过控制絮凝区和沉淀区较低的5min沉降比与定时排泥相结合和改变絮凝区搅拌器的转动方向的运行方式,系统运行近3个月后未出现上述问题,表明采取的措施有一定效果。

The high-density sedimentation tank patent technology, belonging to German Siemens Company, is adopted by water reuse device of a coal-to-olefin project. Since the end of May 2010, the device has appeared serious problems that effect normal operation of high-density sedimentation tank. Settling zone produced high concentration sludge that can not be discharged properly and flocculation zone produced mud that damage its water dynamic balance, eventually it leads to high density tank water unqualified. In order to solve these problems, we adopt a new mode of operation through continuous exploration： 1. Control settlement ratio （5 minutes） of flocculation area and sedimentation zone combining with timing dredge; 2. Change the rotation direction of agitator in flocculation zone. The system has not appeared afore-mentioned problems after running for nearly three months, showing that the measures adopted have certain effect.