基于电容法的温度对舰船汽轮机油分水性影响研究

Effect of the Temperature Based on Capacitance Method on the Oil-Water Separation Performance of Ship Turbine Oil

依据汽轮机油与水的介电常数差值大,其混合相作为电介质,会发生电容值变化显著的原理,采用同轴圆柱形电容作为测试传感器,选取符合世界主流海军舰船汽轮机油产品规范的8个油样,利用电容法对比研究室温(18~24℃)和54℃对油样的分水性影响规律,选取了分水性变化明显的油样进行分水后油层微观形貌分析.试验结果表明:在54℃条件下,从油水混合到分离结束,电容值-时间曲线重合度更高,油水均匀混合重复性好,表现出了优于室温的重复性和稳定性;分水速率曲线具有良好的重复性,验证了电容法评定汽轮机油分水性的可靠性,在相同温度下分水速率和破乳化时间受水相分布与运动态势影响小;确定用电容法评定汽轮机油分水性时,环境温度选择54℃为最佳;作用机理分析说明,温度是影响舰船汽轮机油分水性的关键指标.

According to the principle that the difference between the dielectric constant of steam turbine oil and water is large, and the mixed phase acts as a dielectric, the capacitance value will change significantly. Using coaxial cylindrical capacitors as test sensors, eight oil samples that meeted the specifications of the world’s mainstream naval ship steam turbine oil products were selected. The capacitance method was used to study the influence of room temperature(18 ~24 ℃) and 54 ℃ on the water separation of oil samples. The oil samples with obvious changes in water separation were selected to analyze the microscopic morphology of the oil layer after water separation. The results showed that: 1) At 54 ℃, from the mixing of oil and water to the end of separation, the capacitance value-time curve had a higher degree of coincidence, and the uniform mixing of oil and water had good repeatability, showing better repeatability and stability than room temperature;2) The water separation rate curve had good repeatability, which verified the reliability of the capacitance method to evaluate the water separation of steam turbine oil, and at the same temperature, the water separation rate and demulsification time were less affected by the water phase distribution and movement;3) When determining the water content of steam turbine oil by capacitance method, the ambient temperature was 54 ℃;4) The analysis of the action mechanism showed that temperature was a key indicator that affected the water separation of the steam turbine oil.