加酸系统硫酸减少的原因分析和改进措施

摘要

针对某电厂工业水系统停运期间发生加酸系统硫酸自动进入压力混合器造成硫酸储罐内的硫酸减少的事件,从系统流程、现场布置、设备状况等方面分析事故产生的根源.分析结果表明,工业水系统发生“回流”导致压力混合器产生“真空”进而引发加酸管路发生“虹吸”是造成储罐内硫酸减少的根本原因,针对事故产生的因素提出了加强设备巡检、做好加酸系统、压力混合器设备停运工作的技术措施和做好工业水停运期间全厂工业水用户的管理工作.%In view of the accident: sulfuric acid in acid-adding system automatically flowed into the pressure mixer and caused sulfuric acid reduction in the sulfuric acid storage tank which happened in a power plant during the outage period of industrial water system, the reasons that caused the said accident were analyzed from the aspects of process flow, site layout, equipment status and so on. The results showed that, the refluxing of industrial water system made pressure mixer vacuum, thus led the siphon phenomenon in acid-adding pipeline, which was the basic cause of the sulfuric acid reduction. According to the factors that may cause accident, some modification measures such as: strengthening equipment inspection, perfecting technical measures to ensure the safety of acid-adding system and pressure mixer, completing management mechamism of industrial water users during the outage period of industrial water system were proposed.