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为研究机组运行中润滑油的性能衰变规律,采用有机元素分析、红外光谱分析、热重分析技术建立了机组运行中润滑油多参数测定方法。获得了润滑油碳氢比、碳硫比、红外光谱特征波长强度比、失重起始温度、失重终止温度、最大失重速率等特征参数。碳氢比显示润滑油基本由CH_2组成;红外光谱分析结果表明,润滑油是以长链烷烃为主,其与黏度数据比对分析发现,波数为2 952.67 cm~(-1)时,红外吸收峰高相对质量分数与黏度呈负相关关系;TG-DTG曲线获得9个特征参数中,Ti和Te是润滑油稳定性的重要参数,润滑油在运行中不仅裂解生成小分子低沸点物质,同时也会聚合生成了一些难以氧化分解的高聚物、胶质等,且W_e与W_f呈良好负相关关系,而Wf与β’呈良好正相关关系。
In order to study the decay behavior of lubricating oil during the operation of generating units, the multi-parameter determination method of lubricating oil for generating units was established by using organic elemental analysis, infrared spectroscopy and thermogravimetric analysis. The hydrocarbon-to-carbon ratio, carbon-sulfur ratio, infrared wavelength ratio, the onset temperature of weight loss, the temperature at which the weight loss ends, the maximum weight loss rate and other parameters were obtained. Hydrocarbon ratio shows that the lubricating oil consists essentially of CH 2. The results of IR spectroscopy show that the lubricating oil is dominated by long-chain alkanes. Comparing with the viscosity data, it is found that when the wave number is 2 952.67 cm -1, the infrared absorption Among the nine characteristic parameters of TG-DTG curve, Ti and Te are important parameters of lubricating oil stability. Lubricating oil can not only generate low-molecular-weight and low-boiling substances during the operation, Polymerization also generated some difficult to oxidative decomposition of polymers, gums and so on, and W_e and W_f showed a good negative correlation, and Wf and β ’showed a good positive correlation.