SU748080A1 - Centralized oil-feeding system - Google Patents

Description

(54) CENTRALIZED OIL SUPPLY SYSTEM

The invention relates to systems for the centralized oil supply of turbine equipment of powerful power units at tenlow power plants. The systems of centralized oil supply of turbine equipment of power units of thermal power plants are known, which contain a combined oil tank with oil pump units and oil coolers: after which the lubricant is diverted to various lubrication units 1 from the oil-dispensed collector through local pipelines. power unit equipment layouts. The collector itself may contain various combinations of vertical and horizontal as well as inclined sections. The water used in the oil coolers is under greater pressure than the oil. As a result, the potential increases. water ingress from the lubrication units in violation of the tightness of the tube bundle of oil coolers, which reduces the reliability of the system. This is due to the fact that some lubrication units, for example, radial bearings, can work without any trouble even with abundant watering (oil content of highly dispersed water up to 15-25%) - In a centralized system there are also lubrication units that are very sensitive to flooded oil. For example, hydraulic units, .jy64a gearboxes (electric power pumps, booster pumps, shaft turning devices, etc.) and hydraulic oil seals of an electric generator require clean oil (without water) for normal operation. In the well-known oil supply system, the flooded oil (in case of leakage of oil coolers) will be distributed from a single collector to all lubrication units, including those sensitive to flooded oil, which is unacceptable. Also known is an oil supply system containing a tank with oil pumps, a full-flow local filter drier installed after the oil coolers on the oil-dispensing manifold with

a vertical section in front of the pipelines to drain the oil to the lubrication units sensitive and insensitive to watered oil 2.

The disadvantage of this system is the impossibility of preventing the supply of flooded oil to the lubrication units during emergency breaks of the oil cooler tubes, when the water content in the oil can increase to 5-10% or more.

The purpose of the invention is to simplify the oil supply system and increase the reliability of the lubrication units by partially in-line dehydration of the oil.

This goal is achieved by the fact that the vertical section of the oil-dispensing manifold is installed after the oil coolers, equipped with a flow divider placed at the outlet of the vertical section of the collector and forming an annular gap with its walls, while the pipelines for draining oil to lubricating nodes sensitive to the flooded oil are connected to the collector in place of the annular gap, and local filter-moisture separators installed on these pipelines. In addition, the vertical section of the oil-dispensing manifold to the flow divider is provided with internal longitudinal fins, and the vertical section of the oil-dispensing manifold at the location of the dissector is perforated and enclosed in a shirt.

FIG. 1 shows a generalized centralized oil supply system; in fig. , 2 — vertical section of the oil-dispensing reservoir, containing internal longitudinal fins and perforated section enclosed in a shirt; in fig. 3 - collector design with a single cascade divider and recommended dimensions. The oil pump 2, the oil cooler 3, the vertical section 4 of the oil-dispensing manifold, equipped with pipelines 5 (for draining oil to the radial bearings 6) and 7 (for draining oil to the oil-hydraulic seals of the electric generator 8, gear gearboxes 9, hydroautomatic elements 10. At the exit from the vertical section 4 of the oil-dispensing manifold, a flow splitter 11 is installed, which forms an annular gap 12 with the walls, to which the pipeline 7 is connected with a local moisture filter. divisor of 13 and oil pump 11. The manifold 35 serves to collect the used oil and return it to the oil tank 1. The vertical portion 4 may comprise inner longitudinal ribs 16, the perforation 7N jacket 18 to the conduit 7.

The system works as follows. Oil oil with a relative density of less than one is collected by the oil pump 2 from the oil tank 1 and is fed through the oil cooler 3 to the vertical section 4 of the oil-dispensing manifold. The vertical upward axisymmetric linear movement of the oil causes transverse hydrodynamic forces in the flow, which, acting on water droplets (which are heavier than oil), trapped through a non-hermetic oil cooler, move them to a stable equilibrium zone located at a distance of 0.4 -0.5 radius from the collector wall. The separator And separates the central flow of watered oil (further withdrawn through conduit 5 to radial bearings 6) from the peripheral flow of dewatered oil, which is withdrawn from the annular gap 12 via conduit 7 to lubrication nodes sensitive to the flooded oil, seals of the generator shaft 8, gear gearbox 9, the elements of 10 hydraulic. The local filter drier 13 carries out a fine purification of the oil from water. The oil pump 14 raises the pressure to the level necessary for the normal operation of the shaft seals of the generator 8. The oil that has been exhausted and heated through the manifold 15 is discharged into the tank 1.

The transverse hydrodynamic forces moving the water droplets from the near-wall region of the vertical section of the collector to the zone of stable equilibrium are most intense in the laminar mode

flow. Therefore, in those cases when turbulent movement is possible in the oil distribution manifold, the vertical section 4 prior to dissection 11 is equipped with internal longitudinal fins 16, which laminarize the near-wall flow and create the most favorable conditions for. transfer of water droplets from the collector wall to the inside of the flow core.

In order to divert the dewatered oil from the annular gap between the divider and the collector wall, there is no local perturbation of the axisymmetric flow, the collector section 17 at the location of the dissector 11 is perforated and enclosed in the jacket 18.

If an oil with a relative density above 1.0 is used in the system, for example, a synthetic fire resistant oil based on phosphoric acid esters (ivivol,

OMTI), then in order to use transverse hydrodynamic forces from the movement of water droplets (which are lighter than oil) from the collector wall to the zone of stable equilibrium, it is necessary to organize a downward flow movement.

If the need arises for a more pronounced concentration of water droplets in the flow core (which is possible with increased oil consumption to the lubrication units.

sensitive to flooded oil), then on the vertical section of the oil-dispensing collector several dividers can be installed placed with overlap, and the following ratio of the diameters of the collector and dividers should be observed: {g (H6 + 0 ,,, .. /

... C1. (0 (B 07 Mpch.

Oil consumption for lubrication units that are sensitive to watering oil, usually does not exceed the total oil consumption by the turbine equipment of the energy unit. Therefore, the use of a partial-flow filter separator instead of full-flow filter will allow approximately 90% lower capital costs for the purchase and installation of filter equipment while simplifying operating conditions, since the vertical section of the oil inlet manifold with the flow divider requires virtually no maintenance.

Claims (3)

Invention Formula . The system of centralized oil supply of turbine equipment of the power unit of a thermal power plant, containing a tank with oil pumps, local filters, moisture separators, oil coolers and oil-dispensing manifold with a vertical section with pipelines for draining oil to lubrication units that are sensitive and insensitive to flooded oil, characterized in that, in order to simplify the system to increase the reliability of lubrication units by means of partial-flow dehydration, The vertical section of the oil distribution manifold is installed after the oil coolers, equipped with a divider placed at the exit of the vertical section of the collector and forming 0 with its walls. an annular gap, with the pipelines for draining oil to the lubrication units sensitive to flooded oil connected to the collector in the place of the annular gap, and the local filtering and separating valves are installed on these pipelines. 2. A system according to claim I, characterized with teM, that the vertical portion of the oil-dispensing manifold to the flow divider is provided with an internal longitudinal fins. 3. The system of PP. and 2, different with 0 in that the vertical section of the oil-dispensing manifold at the location of the dissector is perforated and enclosed in a jacket. ,Information sources, taken into account in the examination 1. Slonimsky and. B. Installation of oil systems of turbine units, M., “Energie, 1969, p. 8, fig. 2 2. US patent number 3991564, class. 60-325, published. 1975. do di. ds four-"