反渗透装置一段压差迅速上升的原因分析

Cause analysis of pressure difference swift rise of the first period membrane in reverse osmosis device

针对大唐南京发电厂2×660 MW超超临界机组化学水处理系统反渗透装置运行期间一段压差迅速上升问题进行了分析,故障原因为含有高分子助凝剂(聚丙烯酰胺)的污泥脱水分离液进入反渗透系统,造成反渗透膜严重污堵;采用了离线物理清理和在线化学清洗相结合的方法,使反渗透装置恢复了正常运行。分析结果表明:在化学水处理设置有反渗透系统的新建电厂中,含有高分子聚丙烯酰胺的污泥脱水分离液,应单独排放到工业废水池或煤冲洗水复用系统中,以免造成后续反渗透系统膜元件的严重污染。

Aiming at the problem of pressure difference swift rise of reverse osmosis device of chem＇ istry water treatment system in operation of 2×660 MW ultra supercritical unit in Datang Nanjing Electric Power Plant, analyzes the cause of fault, the fault reason is that sludge dewatering separated liquid containing high polymer coagulant（polyacrylamide） come into reverse osmosis system, which caused the serious blockage of the reverse osmosis membrane. By using the methods of combining off line physical clearance with on line chemical cleaning, make reverse osmosis device resuming normal operation. The analysis result shows that： the chemical water treatment unit with reverse osmosis system in new built power plant, the sludge dewatering separated liquid containing macromolecule polyacryl- amide should be discharge solely into the industrial waste water pool or coal rinsing water multiplexing system, avoid serious pollution of follow-up membrane element of reverse osmosis system.