RU2280773C1 - Method of cleaning passage of gas-turbine engine - Google Patents

Abstract

FIELD: mechanical engineering; gas-turbine engine.

SUBSTANCE: cleaning is carried out by delivering cleaning material consisting of solid monodispersed particles into engine passage, using as cleaning material finely dispersed dry ice, snow particles, particles of water ice or frozen snow crust. Cleaning material is fed to engine compressor input at idling or operating speed owing to rarefaction created at compressor input, or cleaning material is fed through nozzle by gas under pressure at repairs. Sodium bicarbonate in amount of 1-5% of ice volume is added to particles of dry or water ice. At temperature within +30 and +40°C particles of water ice are delivered in amount of 1-10% of mass air flow through engine.

EFFECT: reduced contamination of ambient and clogging of turbine blades with hard particles.

Description

The invention relates to the field of operation of gas turbine engines in industry for the drive of gas pumping units, electric motors and generators for the production of electricity of electric motors for various purposes.

A known method of cleaning the flowing part of a gas turbine engine, comprising supplying cleaning material to the flowing part of the engine in a scroll mode, which ensures the soaking of oil-soot-mud deposits on the surfaces of the flowing part of the engine and the subsequent removal of the air mixture flowing through the leakage part with the indicated dissolved liquid solutions with oil-oil deposits /one/.

However, the disadvantage of this method is the contamination of the outer surface of the gas turbine engine, components and assemblies of fuel-oil systems due to the ejection of a liquid mass of oil-soaked aqueous solutions that impeded the operation of the engine, regulation of the fuel supply systems, as well as water solutions flowing in a mixture with air, cause corrosion of engine parts, including combustion chamber, blades and their turbine cooling systems. In addition, the sludge of soot-oil deposits removed from parts of the engine flow section requires burial in order to prevent its discharge into the environment.

A known method of cleaning the flow part of a gas turbine engine, including the supply of cleaning material to the flow part of the engine in the form of solid monodisperse particles, the mechanical "peeling" of oil-soot-mud deposits from the surfaces of the compressor blades and the removal of the dry mass of deposits by the air flow through the engine during engine operation small gas / 2 /.

However, the particles of the nutshell get into the stream of air cooling the turbine blades, and clog the outlet openings in the blades, which leads to overheating of the blades and their destruction.

In addition, these methods for cleaning the flow part are not applicable when repairing the flow part of a gas turbine engine, in repair shops, or during TO-4, when the compressor is opened in the conditions of the compressor station of the gas pipeline for the purpose of defectoscopy.

Currently, when performing TO-4 on GTK engines, aqueous solutions are used and the surfaces of compressor blades, barrels and other parts of the flowing part of the GTK-10 stationary engine are manually washed.

The aim of the invention is to eliminate the disadvantages inherent in these cleaning methods, namely:

- reduction of emissions of aqueous solutions with dissolved carbon black deposits on the outer surface of a gas turbine engine, units of fuel oil systems of the engine;

- reduction of environmental pollution;

- the exclusion of the formation of corrosion damage to parts of the combustion chamber, turbine blades;

- providing the possibility of using the inventive method both during scrolling or operation of the engine as part of the gas compressor unit, and when conducting TO-4 at the compressor station or during repair of the flow part of the gas turbine engine in the repair shop;

- reducing the risk of clogging of turbine blades cooled by air with solid particles due to a sharp decrease in the mass of "dry" sludge due to the conversion of the cleaning particles into gas during their contact with the surface to be cleaned.

The goal is achieved by the fact that in the known method for cleaning the flow part of a gas turbine engine, comprising supplying cleaning material to the flow part of the engine in the form of solid monodisperse particles, said material is fed to the compressor inlet when it is scrolled or operating at revolutions and the acceleration of the particles of the cleaning material due to rarefaction created at the inlet of the compressor, or dispersal of particles of cleaning material is carried out by gas under pressure through an accelerating nozzle during repair, and as a cleaning material using fine dry ice, snow particles, water ice particles, infusion.

Upon contact with the surface of the flow part of the GTL, dry ice particles, due to the kinetic energy received from the flow of air flowing through the engine or due to the use of compressed air from an autonomous source, are converted to carbon dioxide or vapor, which dramatically reduces the mass of oil and oil deposits and actually only the amount of sludge that was accumulated on the compressor blades during its operation is discharged from the engine into the environment.

For comparison, with the wet cleaning method, 250-400 liters of M-1, M-2, TK-950 fluids are used for each washing, and, taking into account dissolved soot-oil deposits, part of the formed sludge is thrown through the surge pockets onto the engine surface, and the bulk of the liquid sludge is spilled into prefabricated containers are then sent for disposal or to the environment.

In total, 17–20 wet or dry cleanings are carried out for the full exhausted resource, and from 2 to 4 tons of liquid sludge is thrown into the environment or in another way. With a total number of GTL 5 pcs. only at one compressor station of the gas pipeline, 10 to 20 tons of aqueous solutions of soot and oil deposits removed from the blades of the flow part of the compressor are emitted.

When using dry ice as a discharged sludge, there will be practically no emissions at each compressor station, since the bulk of them will burn in the combustion chamber mode, and 10-17 kg of dry mass will be discharged at the outlet for the entire spent resource.

The goal is also achieved by adding sodium bicarbonate in the amount of 1-5% of the volume of ice to the particles of dry or water ice

The goal is also achieved by the fact that the specified bicarbonate additive is carried out at the opening of the engine in the engine repair workshop.

The goal is also achieved by the fact that at ambient temperatures of + 30- + 40 ° C particles of water ice are fed to the engine inlet in an amount of 1-10% of the mass air flow through the engine.

Due to the large supply of “cold” ice particles, compared with a drop of water of the same size, there is an increase in engine power.

During repairs or TO-4 from an autonomous source of compressed air, air with a pressure of 5-8 ati and a flow rate of 3-5 m ³ / min is supplied to the accelerating nozzle, and dry or water ice is dosed due to the ejection developed by the nozzle during supersonic air outflow through the booster nozzle is fed to the output section of the booster device and then to the compressor blades.

Similarly, on TO-4, ice particles are dispersed in the nozzle and fed to the surface of the flow part of the compressor, barrel and turbine.

To simplify the method, liquid carbon dioxide is supplied to the engine inlet through special metering holes from a container with liquid carbon dioxide, which is throttled and turns into snow mass when the pressure at the outlet openings is different, and which is sucked into the engine flow section due to rarefaction at the compressor inlet on the scroll. Similarly, during engine operation, cleaning is carried out with a snow mass of carbon dioxide.

1. Instruction manual NK-14ST-10, Technological map 7.15, Samara. KKBM, 1979.

2. RU 2178532, IPC 7 F 02 C 7/30, 01.20.2002.

Claims (3)

1. The method of cleaning the flow of the gas turbine engine, including the supply of cleaning material to the flow of the engine in the form of solid monodisperse particles, characterized in that the cleaning material is fed to the inlet of the engine compressor when it is scrolled or at the operating speed due to the vacuum generated at the inlet of the compressor, or the cleaning material is supplied through the nozzle by gas under pressure during repair, and fine dry ice, snow particles, water ice particles or infusion are used as the cleaning material. 2. The method according to claim 1, characterized in that sodium bicarbonate is added to the particles of dry or water ice in an amount of 1-5% of the volume of ice. 3. The method according to claim 1, characterized in that at ambient temperatures of 30-40 ° C., water ice particles are fed to the engine inlet in an amount of 1-10% of the mass air flow through the engine.