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机械密封是双螺杆混输泵防止输送介质向外泄漏,保证其安全可靠运行的关键部件。对于塔河油田12区混输站输送原油含气量高,含H2S毒性物质的特点,本文根据机械密封结构与工作原理,结合输送介质特性,分析输送介质含气量高、含H2S毒性物质对机械密封的影响,并对比单端面密封、无压双重密封与有压双重密封等三种工程常用的机械密封及其冲洗方案特点,为双螺杆混输泵选择了合理的机械密封型式及冷却循环系统,保证了双螺杆混输泵的安全可靠运行。
Mechanical seal is a twin-screw hybrid pump to prevent leakage of media to ensure its safe and reliable operation of the key components. According to the mechanical seal structure and working principle, combined with the characteristics of conveying medium, the paper analyzes the characteristics of high content of gas and H2S toxic substances in mechanical seal Compared with the common mechanical seals and their flushing schemes of single seal, double seal without pressure and double seal with pressure, the reasonable type of mechanical seal and cooling circulation system were selected for the double screw mixed pump, Ensure the safe and reliable operation of twin screw hybrid pump.