Why does the vacuum oil filter tank foam?
3: turbine EH oil has cracked, can not be reused. EH steam turbine oil long-term operation at high temperature, some low molecular groups in the oil additive to volatilize, anti foam agent have disappeared, with the passage of time, oxidation strengthening, oil viscosity increases, the oil film strength also increased, gas permeability variation, provided the conditions for the formation and stability of foam the existence of. Waste oil which can not be reused at this time should be abandoned. In general, the vacuum oil filtration system prolongs the service life of various types of oil in the steam turbine system for 2-3 years, and is not indefinitely extended.
Free gas bubble, general steam turbine lubricating system is generally open or forced circulation type, in a certain degree of exposure in the air, oil churning, mixed with a lot of air, and partly dissolved gas, oil soluble liquid, volume of about 10%. When the vacuum oil filter, vacuum flash tower is vacuum, gas solubility decreased, gas free bubble, but there are some small bubbles exist in the form of oil, with the oil flows in the vacuum oil filter machine, in each link may join the new gas. Finally with the oil movement and arrived in the tank, in the oil phase precipitation, causing bubbles.
1: the fuel tank return port is improperly set, resulting in two gas mixing. Generally, the condensate gas tank, precipitation, slag falling settlement, oil return port is arranged below the surface of oil, the oil from the high drop into the tank, increase the chance of air into the oil, also caused a stir, let the water back by gravity sedimentation oil layer, bubble generation.2: steam turbine system design flaws or system aging and other man-made EH steam turbine oil system with steam or water, then will cause the oil emulsion, oil emulsion into the vacuum distillation tower, high temperature vacuum evaporation, bubble, if EH oil vacuum filter without defoaming or eliminating system bubble device damage will lead to the bubble with the oil into the tank to cycle.
