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2008年2～7月,燕山石化炼油一厂液力透平机械密封系统发生5次泄漏。对其进行改造:密封内部结构,将双端面机械密封由旋转式改为静止式;用小弹簧取代波纹管,密封“O”形圈选用全氟醚橡胶(FFKM);动、静环材料升级为复合型碳化硅,提高了导热性能;将密封动环的镶嵌式结构改为整体加工结构,密封静环几何形状最大限度地保证了温度的均匀变化;缩小密封面宽度,以减少摩擦产生的热量;将泵送环由螺旋型更换为离心式,以增加隔离液的循环流量。密封辅助系统,在靠近大气侧的第二道密封外部通入保护氮气,防止泄漏出的少量高温隔离液与空气中的氧气接触产生积碳;氮气经过滤、减压后,用紫铜管引入密封腔体内。冷却水改造,将软化水引至液力透平,既可替代原有循环水,又无需增加额外的软化水消耗。软化水的使用,消除了隔离液冷却器盘管外部结垢隐患。改造后,液力透平的同步运行率由53.2%提高到98.0%。每年节电1.94×106kW.h,节约资金136万元。
February to July 2008, Yanshan Petrochemical Refinery a hydraulic turbine mechanical seal system leak occurred 5 times. To be modified: the internal structure of the seal, the double-ended mechanical seal from rotary to static; with a small spring to replace the bellows, seal “O” -shaped ring use perfluoroelastomer (FFKM); dynamic and static ring The material is upgraded to composite silicon carbide to improve the thermal conductivity; the inlaid structure of the sealing dynamic ring is changed to the overall processing structure, the geometric shape of the sealing ring ensures the uniform temperature variation to the maximum extent, and the width of the sealing surface is reduced to reduce the friction The heat generated; the pump ring replaced by the spiral-type centrifugal to increase the circulation of liquid isolation flow. Sealing auxiliary system, near the atmosphere side of the second seal access to the protection of nitrogen to prevent leakage of a small amount of high-temperature liquid and oxygen in the air contact with the oxygen generated carbon deposition; nitrogen after filtration, vacuum, the introduction of copper Seal chamber. Cooling water transformation, the introduction of demineralized water turbine, can replace the original recycled water, without adding additional demineralized water consumption. The use of demineralized water eliminates the risk of fouling outside of the insulation liquid cooler coil. After transformation, the hydraulic turbine synchronous operation rate increased from 53.2% to 98.0%. Energy-saving 1.94 × 106kW.h each year, saving 1.36 million yuan of funds.