API PLAN53C密封冲洗在加氢液力透平的首次应用  

Successful application of API PLAN53C seal flush for hydraulic turbine in Hydrogenation Unit

作　　者：原栋文[1] 

机构地区：[1]中国石油化工股份有限公司金陵分公司,江苏省南京市210033

出　　处：《炼油技术与工程》2013年第5期36-38,共3页Petroleum Refinery Engineering

摘　　要：加氢处理装置液力透平的机械密封型式和冲洗方案选择是决定液力透平长周期运行和装置安全生产的重要因素。目前所有液力透平的密封系统配置都是PLAN53A或者PLAN53B冲洗方案,虽然API682中对PLAN53C冲洗方案有所描述,在化工行业搅拌斧的机械密封中有工业应用,但是在炼油厂高温热油泵上的工业应用国内外尚处空白。选用PLAN53C冲洗方案,通过平衡活塞代替蓄能器,活塞上方腔室连通隔离液系统,下方腔室连通内侧密封腔,活塞上下表面作用面积不同,平衡状态下隔离液压力恒大于内侧密封腔压力15%,成功地降低了密封端面两侧的压差,虽然密封腔压力达到3.0 MPa,但是密封端面两侧只有0.4 MPa压差,从根本上改善了金属波纹管的工作环境,延长了工作寿命,保证机械密封长周期运行。The right selections of right mechanical sealing and flushing process of hydraulic turbine in hydrotreating unit determines the safety and long-term operation of the unit.In present design of the unit,the PLAN53A OR PLAN53B flushing is selected for the sealing systems of almost all hydraulic turbines.Although the PLAN53BC flushing is described in API682 standard and has been applied for the mechanical seal of mixers in chemical industry,it has not been used for the mechanical seals in high-temperature hot oil pumps of refineries.By the selection of PLAN53C flush design,utilization of balance piston instead of accumulator,the connection of upper chamber of piston with separation liquid system and connection of lower chamber of piston with internal seal chamber,the pressure of the separation liquid in balance state is higher than the pressure of internal seal chamber by 25% and the pressure difference between two sides of seal face is successfully reduced.Although the pressure in seal chamber is as high as 3.0 MPa,the pressure difference between the two side of seal face is only 0.4 MPa,which has substantially improved the working conditions of steel bellow tubes,extended the service life and ensured the long-term operation of the mechanical seals.

关 键 词：液力透平 热油泵 机械密封 冲洗方案 

分 类 号：TE624[石油与天然气工程—油气加工工程]