SU1656180A1 - Thermohydrodynamic method of cleaning inner chambers of oil system - Google Patents

Abstract

The invention relates to a power system and can be used to clean the internal cavities of oil systems of turbomachines. The purpose of the invention is to increase the efficiency and shorten the duration of the thermohydrodynamic method of cleaning the internal cavities of the oil systems of pipe machines, using the method of pumping oil at elevated speeds and injecting it into the dispersed gas flow. To improve the detergent properties, the oil is heated to 120 ° C and above, and in order to consequently increase the oil does not age, it is de-aerated in a previously sealed oil system. Inert nitrogen pre-moistened with water or steam is used as the dispersed gas, as a result of which the foam structure of the stream is maintained even at elevated temperatures. Alternatively, a method is proposed for deoiling the oil by heat treatment to a temperature of 120 ... 130 ° C. The method is most effective when alternating the pumping of a gas-oil mixture that is either heated or cooled (thermal shock effect). 1 п.з. f-ly, 1 ill. (Ls

Description

The invention relates to a power system, and specifically to stationary turbomachines, and can be used to clean the internal cavities of the oil system.

The purpose of the invention is to improve the cleaning efficiency by increasing the range of maximum permissible temperatures of the heated oil without deteriorating its physicochemical properties.

The drawing shows a schematic diagram of the oil system in which the cleaning method is implemented.

The diagram contains the main oil tank 1, in which the strainers are placed

2.3 and degasser 4, made in the form of a multi brown outlet. A pump 5, a heat exchanger 6, a pressure manifold with a cutting valve 7, jumpers 8, bypass bearings 9, a drain oil pipe 10 are connected to tank 1, to the top of tank 1 a fan 11 is connected, the discharge side of which is connected to atmospheric exhaust pipe 13 by the valve 12, to the safety valve 14, the valve 15 to the suction cavity of the injector 16, which acts as a gas-liquid mixer-disperser. Pipelines 17 are also connected to the injector for supplying VmepTHoro gas and 18 for

about ate

ON 00

ABOUT

water supply (or water vapor). The heat exchanger 6 is recycled by line 19 to tank 1. The lower part of tank 1 contains line 20 for draining oil to the purifier (dirt), adsorber, and other separating devices and line 21 for draining water from the bottom (for drainage, for extracting additives). recycling, etc.). A bubbler 22 can also be built into tank 1 for blowing out oil with an inert gas (in the simplest case, a bubbler is a system of perforated pipes).

The method is implemented as follows.

First, the oil system is sealed carefully (isolate the internal cavities from the surrounding atmosphere): all connectors are sealed, the valve 12 is closed on the exhaust pipe 13.

Then the oil in the tank 1 is deoxygenated — Ute, for example, by flushing the oil with an inert gas (nitrogen) through the bubbler 22 with the gas mixture being withdrawn by the fan 11 through valve 14 to the atmosphere.

The oil is pumped along the circuit: tank 1, pump 5, heat exchanger 6, recirculation line 19 (valve 7 is closed). By feeding a hot heat carrier (hot water, steam) to the heat exchanger, the oil is heated to the optimum temperature (100–120 ° C).

Then the recirculation line 19 is turned off, the valve 7 is opened and hot oil is supplied to the pressure line, to bridges 9, to the drain oil lines 10. A part of the oil is passed through injector 16, into the intake cavity of which inert gas (nitrogen) is fed through line 17 and water ( water vapor) through line 18. As a result, heated oil circulates through the flushing circuit with dispersed inert gas moistened with water, which ensures a stable two-phase flow structure and its effective washing effect.

The oil is freed from mechanical impurities in tank 1 by filtering through mesh partitions 2 and 3. Dispersed gas is separated in a degasser and fan 11 (Pumped out through open valve 15 to injector 16 for repeated (multiple) use: at the same time supplying ingredients along lines 17 and 18 are reduced.

Concentrated contaminants from line 20 are diverted to after-treatment. If there is excess water, it is drained through pipe 21, and its deficit is compensated for by supplying the appropriate amount of water through line 18.

After completion of the first wash cycle of the oil system (hot flow)

The oil circulation contour is again collected: tank 1, pump 5, heat exchanger 6 (in which cold coolant is now supplied), recirculation lines 19 (valve 7 is closed).

After the oil in the tank 1 is cooled to the optimum temperature (20–30 ° C), line 19 is turned off, the valve 7 is opened, the second cycle of oil system washing with cooled oil together with dispersed inert gas (nitrogen) is started. As a result of the thermose effect, an intense detachment of contaminants from the walls of pipelines occurs and they are carried out by a two-phase flow into tank 1.

Then the indicated pumping cycles of the heated and cooled two-phase flow are alternated until the completion of the entire washing procedure.

Since the de-aerated oil is involved in the washing process, its high heating (up to 120-130 ° C and higher), as well as the presence of water does not affect the physicochemical properties of the oil, does not provoke aging, this oil (after filtering and removing water) is suitable for normal operation,

Water at the end of flushing is removed from tank 1 by evaporating it when fan 11 is operated and vapor is removed through valve 12 to pipe 13. This operation allows to return to water those water-soluble additives that have passed (partially) to water. Sludge water removed to the pipeline 21 should also be subjected to evaporation in order to dispose of water-soluble additives.

Dissolved oxygen from the volume of the oil, isolated from the surrounding atmosphere, can be removed by heat treatment it to 120 - 130 ° C. For this purpose, the circulation circuit is collected: tank 1, pump 5, heat exchanger 6 (with hot coolant supply), recirculation line 19. At the specified thermal effect, oxygen irreversibly interacts with the oil to form sludge (it is drained). This method of removing oxygen is appropriate when there is a shortage of inert gas (lower operating costs).

Example. The turbines are flushed with Tp-22C 9972-86 pipelines with an internal diameter of 100 mm and a length of 20 m from pre-precipitated artificial pollution (a mixture of iron oxides and oil sludge) with an initial mass of 4.2 kg. The pipeline was conditionally considered clean when there were no more than 0.1 kg of contaminants left in it (measurement error). The average flow rate of the washing sludge is 4.0 m / s. The time for which pipeline cleaning was achieved is as follows.

Oil pumping mode (without dispersed gas) at temperature: t, h t 70 ° C18

t 120 ° C12

The mode of pumping oil with dry dispersed nitrogen at a volume concentration of 65% and temperature

t 70 ° C15

t 120 ° C11

The mode of pumping oil with dispersed nitrogen 65% by volume and dispersed with water 0.5% by volume. at a temperature

t 70 ° C14,5

t 120 ° C7,0

Oil pumping mode with moistened water (0.5%) dispersed nitrogen (65% vol) with three alternating cycles of heating to 120 ° C and cooling to 30 ° C5

The mode of pumping oil with dispersed and non-humidified nitrogen (65% vol.) With three alternating cycles of heating to 70 ° C and cooling to 20 ° C 13

Claims (2)

1. Thermo-hydrodynamic method of cleaning the internal cavities of the turbomachine oil system, including the operation of alternately pumping heated and cooled oil together with dispersed gas, characterized in that, in order to increase the cleaning efficiency by increasing the maximum allowable temperature of the heated oil without deterioration of its physicochemical properties, the internal cavities of the oil system are isolated from the surrounding atmosphere, dissolved oxygen is removed from the oil, and inert gas is injected into the flow; water or steam. 2. A method according to claim 1, characterized in that the dissolved oxygen is removed from the oil by heat treatment to 120-130 ° C. - mr 21 20  2