Aero-engine runner cleaning agent and use method thereof

Abstract

The invention discloses an aero-engine runner cleaning agent and a use method thereof. The aero-engine runner cleaning agent is prepared from the following raw material components in parts by weight: 65-80 parts of water, 7-9 parts of sodium metasilicate, 5-8 parts of a composite surfactant, 1-3 parts of triethanolamine oleate and 7-15 parts of saturated isoparaffin. The using method of the cleaning agent comprises the steps that the engine is not detached from an airplane, in the cold running or slow running state of the engine, the cleaning agent is atomized into water particles of 50-100 micrometers through an injection method, the water particles are injected into an air flow channel through an engine cleaning nozzle, and deposits such as carbon, salinization, dust dirt and oil dirt on the engine air flow channel are effectively cleaned on line. The engine runner cleaning agent has the characteristics of no damage, rapidness and no corrosion to a base material, can be used for on-line cleaning of salinization, oil dirt, dirt, carbon deposition and other sediments on the engine runner, and is less in engine cleaning agent consumption and high in cleaning efficiency compared with traditional engine runner cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning airflow passages of aircraft engines, and in particular to an aircraft engine airflow passage cleaning agent and a use method thereof. Background Art

[0002] During the use of aircraft engines, due to the influence of the use environment and changes in engine performance, salt, oil, dirt, carbon deposits and other deposits will appear on the surface of the air flow channel (including compressor blades, turbine blades and combustion chamber fuel nozzles), making the surface of the air flow channel rough and the geometric shape changed, causing engine performance to decline, thereby shortening the engine's service life.

[0003] The existing cleaning methods are:

[0004] 1. Remove the engine from the aircraft, decompose the engine into individual parts or units, and use ultrasonic immersion cleaning, alkaline explosion to remove carbon deposits, gasoline or kerosene flushing, etc. The cleaning process is complicated and the cleaning time is long (generally at least 5 working days). A large amount of cleaning agent is required, which seriously shortens the service life of the engine.

[0005] 2. Start the engine and run it cold or at slow speed, spray the cleaning agent onto the airflow channel or blades, and use the engine rotation and the impact force and temperature of the cleaning agent to clean the deposits. This cleaning method requires the cleaning agent to have low foaming properties and strong permeability, and can not only remove stubborn deposits such as carbon deposits, salt stains, and dirt, but also quickly remove oil stains. At the same time, the amount used is small, easy to clean, and non-corrosive to the various material combinations and special coatings of the engine airflow channel.

[0006] However, if gasoline, kerosene and pure organic solvents are used for wing cleaning, it is not easy to remove stubborn deposits on the engine airflow channel, and the cleaning fluid is easy to volatilize. Cleaning the airflow channel when the engine is cold or slow-running is easy to cause fire, explosion and other accidents; and the use of strong alkaline or strong acidic water-based cleaning agents for cleaning is easy to corrode the parts on the flow channel. A large amount of cleaning fluid or water is required for flushing after cleaning, and the cleaning agent residues pollute the environment; if a water-based cleaning agent containing a general surfactant is used for cleaning, there is a lot of foam, which is not suitable for cleaning residual oil stains. At the same time, a large amount of water is required for flushing, and the cleaning agent foam is easy to penetrate into the blind cavity of the engine flow channel, resulting in inadequate cleaning. Summary of the invention

[0007] The purpose of the present invention is to provide an aircraft engine flow passage cleaning agent and a method of use, so as to solve the technical problems that the cleaning agents in the prior art have insufficient penetration ability, large foaming properties, and cannot meet the requirements of online safe removal of deposits on the engine flow passage.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The invention provides an aircraft engine flow channel cleaning agent, the raw materials of which include the following components by weight: 65-80 parts of water, 7-9 parts of sodium metasilicate, 5-8 parts of composite surfactant, 1-3 parts of triethanolamine oleate, and 7-15 parts of saturated isomeric alkanes.

[0010] Furthermore, the composite surfactant is compounded by a nonionic surfactant and an anionic surfactant, and the compounding ratio is (10:1.4-3.5). Under this compounding ratio, the composite surfactant has the best effect, the cleaning agent has the best effect, the dosage is small, the cleaning efficiency is high, and there is no sediment.

[0011] Furthermore, the nonionic surfactant is compounded from at least two of alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, and lauric acid diethanolamide.

[0012] Furthermore, the alkylphenol polyoxyethylene ether is an emulsifier TX-10 or OP-10; the aliphatic polyoxyethylene ether is an emulsifier AEO-9, T-80 or T-60; and the lauric acid diethanolamide is a detergent 6501.

[0013] Furthermore, the anionic surfactant is alcohol ether carboxylate.

[0014] Furthermore, the saturated isoalkane has a carbon chain content of 8-12 and a boiling point of 180-200°C.

[0015] Furthermore, the saturated isoalkane is one of T65, 706, and FDS166.

[0016] The present invention also provides a method for using the aero-engine flow channel cleaning agent, comprising the following steps:

[0017] S1. The cleaning medium is placed in the cleaning device and heated to 80-100°C;

[0018] S2, the cleaning device is connected to the engine through pipes and nozzles;

[0019] S3. When the engine is running cold or slow, the cleaning device atomizes the cleaning medium into particles of 50-100 microns at a pressure of ≤0.4MPa, sprays it to the target area to be cleaned within 0.5-1min, and soaks the cleaning target area for 1-3min. This process is one cycle, and the amount of cleaning medium used in a single cycle is ≤20L;

[0020] S4, cleaning agent cleaning 5 to 10 cycles;

[0021] S5. Clean the target area with a detergent (a mixture of distilled water, soft water, pure water and anti-rust additives) for 4 to 8 cycles until the detergent flows out clean and the pH value is 7-8;

[0022] S6. Use borescope to check if there is any abnormality in the engine flow passage, and the cleaning target area is clean and has no cleaning agent residue.

[0023] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0024] (1) Excellent cleaning performance and low foaming. First, the non-ionic surfactants such as polyoxyethylene ether and lauric acid diethanolamide with balanced hydrophobic and hydrophilic groups are used to effectively reduce the surface tension of the cleaning agent, quickly diffuse to the interface, and improve the cleaning agent's resistance to hard water and cleaning effect. Secondly, the alcohol ether carboxylate, which has the characteristics of both anionic and non-ionic surfactants, is used as an anionic surfactant, which can synergize with the non-ionic surfactant to effectively eliminate or increase the turbidity point of the non-ionic surfactant, increase the solubility, detergency, wettability, emulsification, dispersibility and calcium saponification dispersibility of the cleaning agent, and reduce the foaming of the cleaning agent during the cleaning process. While ensuring the cleaning effect, the use of cleaning water is reduced, which is more conducive to the online cleaning of the flow channel. Thirdly, the surfactant is compounded by non-ionic surfactant and anionic surfactant. When the compounding ratio is (10:1.4~3.5), the cleaning efficiency is high and the oil-water balance is achieved, avoiding the stratification of the cleaning agent and the possible uneven cleanliness.

[0025] (2) Saturated isomeric alkanes (carbon chain content of 8-12, boiling point of 180-200°C) are added to improve the dissolution and cleaning of oil stains by online cleaning, while increasing the solubility of surfactants, improving the dissolution of residual oil, gas and stubborn sediments in the flow channel, and improving the cleaning effect.

[0026] (3) The multiple hybrid atoms O and N in triethanolamine oleate can react with Ca in aqueous solution. 2+ Mg 2+ Chelate and soften water. At the same time, it can also chelate with heavy metal ions in sediments to enhance the decontamination ability.

[0027] (4) Sodium metasilicate will not vitrify when dissolved in water. It can adjust the pH value of the cleaning agent and be compounded with the above components to enhance the cleaning agent's wetting, emulsifying and saponifying effects on oil stains, while preventing dirt from re-precipitating and improving cleaning efficiency.

[0028] (5) The present invention does not use strong acids or strong bases, does not contain sulfur or phosphorus substances, and is a water-based cleaning agent with water as the main component. It is environmentally friendly, can reduce the amount of cleaning fluid used, and is conducive to online cleaning of the flow channel. At the same time, it utilizes the high boiling point of saturated isoalkanes, does not contain additives, and has little residue in the cleaning agent, thereby solving the problems of low-boiling point organic solvents being easily volatile and ignited at high temperatures and remaining in the cleaning agent. It can meet the needs of safe oil removal and carbon removal, improve the cleaning effect, and solve the problem of safety and environmental protection.

[0029] (6) The present invention uses a cleaning agent to be atomized into particles for targeted cleaning of the target area to be cleaned, with a small amount of cleaning agent used and high cleaning efficiency.

[0030] (7) The present invention obtains a cleaning agent with excellent cleaning performance and less foam through a compound system of sodium metasilicate, composite surfactant, triethanolamine oleate, and saturated isomeric alkanes. At the same time, when the non-ionic surfactant is active and the compounding ratio of the anionic surfactant is 10:1.4-3.5, the cleaning effect is best when the sodium metasilicate is 7-9 parts, the triethanolamine oleate is 1-3 parts, and the saturated isomeric alkanes are 7-15 parts. These ingredients are indispensable. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 is a comparison chart of borescope inspection results before and after cleaning of Example 3 of the present invention;

[0033] Figure 2 This is a graph showing the ratio of the proportion of anionic surfactant in the composite surfactant of Example 14 of the present invention to the cleaning effect. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0035] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0036] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0037] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to the skilled artisan. The present invention description and examples are exemplary only.

[0038] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0039] Embodiment 1:

[0040] The raw materials in this example include: 8 parts by weight of a composite surfactant, 9 parts by weight of sodium metasilicate, 3 parts by weight of oleic acid triacetamide, 15 parts by weight of saturated isomeric alkanes and 65 parts by weight of water, to prepare a cleaning agent.

[0041] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:3.3.

[0042] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 5 parts by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 2 parts by weight.

[0043] The saturated isoparaffin is FDS166.

[0044] The cleaning method in this example is:

[0045] Place the cleaning medium in the cleaning device and heat it to 95°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.2MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 5 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.2.

[0046] Embodiment 2:

[0047] The raw materials in this example include: 5 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 3 parts by weight of oleic acid triacetamide, 14 parts by weight of saturated isomeric alkanes and 70 parts by weight of water, to prepare a cleaning agent.

[0048] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:2.5.

[0049] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the aliphatic polyoxyethylene ether AEO-9 is 1 part by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0050] The saturated isoparaffin is FDS166.

[0051] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 90°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 90-micron particles at a pressure of 0.3MPa and sprays it to the target area to be cleaned within 0.8min, and soaks the cleaning target area for 2min. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 10 cycles, and then use the detergent to clean for 5 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.8.

[0052] Embodiment 3:

[0053] The raw materials in this example include: 8 parts by weight of a composite surfactant, 9 parts by weight of sodium metasilicate, 3 parts by weight of oleic acid triacetamide, 15 parts by weight of saturated isomeric alkanes and 65 parts by weight of water, to prepare a cleaning agent.

[0054] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:3.3.

[0055] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the aliphatic polyoxyethylene ether AEO-9 is 2 parts by weight, the lauric acid diethanolamide 6501 is 2 parts by weight, and the anionic surfactant (alcohol ether carboxylate) is 2 parts by weight.

[0056] The saturated isoparaffin is FDS166.

[0057] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 90-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 0.5min, and soaks the cleaning target area for 3min. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 7 cycles, and then use the detergent to clean for 4 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.4.

[0058] Embodiment 4:

[0059] The raw materials in this example include: 5 parts by weight of a composite surfactant, 7 parts by weight of sodium metasilicate, 1 part by weight of triacetamide oleate, 7 parts by weight of saturated isomeric alkanes and 80 parts by weight of water, to prepare a cleaning agent.

[0060] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:2.5.

[0061] The nonionic surfactant alkylphenol polyoxyethylene ether OP-10 is 2 parts by weight, the aliphatic polyoxyethylene ether T-60 is 1 part by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0062] The saturated isoparaffin is FDS166.

[0063] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 85°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 60-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 4 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.2.

[0064] Embodiment 5:

[0065] The raw materials in this example include: 7 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 10 parts by weight of saturated isomeric alkanes and 73 parts by weight of water, to prepare a cleaning agent.

[0066] The composite surfactant is a compound of a nonionic surfactant (aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:1.7.

[0067] The nonionic surfactant aliphatic polyoxyethylene ether AEO-9 is 3 parts by weight, the lauric acid diethanolamide 6501 is 3 parts by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0068] The saturated isoalkanes are 706.

[0069] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 90°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 50-micron particles at a pressure of 0.3MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 10 cycles, and then use the detergent to clean for 4 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.6.

[0070] Embodiment 6:

[0071] The raw materials in this example include: 6 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of triacetamide oleate, 8 parts by weight of saturated isomeric alkanes and 76 parts by weight of water, to prepare a cleaning agent.

[0072] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:2.

[0073] The nonionic surfactant alkylphenol polyoxyethylene ether OP-10 is 2 parts by weight, the aliphatic polyoxyethylene ether T-60 is 2 parts by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0074] The saturated isoparaffin is FDS166.

[0075] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 100°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 60-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 7 cycles, and then use the detergent to clean for 5 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.8.

[0076] Embodiment 7:

[0077] The raw materials in this example include: 5 parts by weight of a composite surfactant, 7 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 75 parts by weight of water, to prepare a cleaning agent.

[0078] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:2.5.

[0079] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the aliphatic polyoxyethylene ether T-80 is 1 part by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0080] The saturated isoparaffin is FDS166.

[0081] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 90°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 6 cycles, and then use the detergent to clean for 4 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.5.

[0082] Embodiment 8:

[0083] The raw materials in this example include: 8 parts by weight of a composite surfactant, 7 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 13 parts by weight of saturated isomeric alkanes and 70 parts by weight of water, to prepare a cleaning agent.

[0084] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:1.4.

[0085] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the aliphatic polyoxyethylene ether AEO-9 is 2 parts by weight, the aliphatic polyoxyethylene ether T-60 is 1 part by weight, the lauric acid diethanolamide 6501 is 2 parts by weight, and the anionic surfactant (alcohol ether carboxylate) is 1 part by weight.

[0086] The saturated isoparaffin is FDS166.

[0087] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 85°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 5 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.3.

[0088] Embodiment 9:

[0089] The raw materials in this example include: 6 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 12 parts by weight of saturated isomeric alkanes and 73 parts by weight of water, to prepare a cleaning agent.

[0090] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:5.

[0091] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 1 part by weight, the aliphatic polyoxyethylene ether AEO-9 is 2 parts by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 2 parts by weight.

[0092] The saturated isoparaffin is FDS166.

[0093] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 85°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 2 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.3.

[0094] Embodiment 10:

[0095] The raw materials in this example include: 7 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 15 parts by weight of saturated isomeric alkanes and 68 parts by weight of water, to prepare a cleaning agent.

[0096] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:4.

[0097] The nonionic surfactant alkylphenol polyoxyethylene ether OP-10 is 3 parts by weight, the aliphatic polyoxyethylene ether T-80 is 1 part by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 2 parts by weight.

[0098] The saturated isoparaffin is T65.

[0099] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 100-micron particles at a pressure of 0.3MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 5 cycles, and then use the detergent to clean for 5 cycles; use the borescope to check that there is no abnormality in the blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.7.

[0100] Embodiment 11:

[0101] The raw materials in this example include: 8 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 73 parts by weight of water, to prepare a cleaning agent.

[0102] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:10.

[0103] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the aliphatic polyoxyethylene ether AEO-9 is 1 part by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 4 parts by weight.

[0104] The saturated isoparaffin is FDS166.

[0105] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.2.

[0106] Embodiment 12:

[0107] The raw materials in this example include: 5 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 74 parts by weight of water, to prepare a cleaning agent.

[0108] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:6.7.

[0109] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 2 parts by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 2 parts by weight.

[0110] The saturated isoparaffin is FDS166.

[0111] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.4.

[0112] Embodiment 13:

[0113] The raw materials in this example include: 7 parts by weight of a composite surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 72 parts by weight of water, to prepare a cleaning agent.

[0114] The composite surfactant is a compound of a nonionic surfactant (alkylphenol polyoxyethylene ether, lauric acid diethanolamide) and an anionic surfactant (alcohol ether carboxylate), and the compounding ratio of the nonionic surfactant to the anionic surfactant is 10:7.5.

[0115] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is 3 parts by weight, the lauric acid diethanolamide 6501 is 1 part by weight, and the anionic surfactant (alcohol ether carboxylate) is 3 parts by weight.

[0116] The saturated isoparaffin is FDS166.

[0117] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.6.

[0118] Embodiment 14:

[0119] The raw materials in this example include: calculated as 100 parts by weight, 9 parts by weight of sodium metasilicate, 3 parts by weight of triethanolamine oleate, 15 parts by weight of saturated isoalkane FDS166, 3 to 6 parts by weight of TX-10, 1 part by weight of diethanolamine laurate 6501, 0.5 to 2 parts by weight of alcohol ether carboxylate, and the balance water.

[0120] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.4~7.8.

[0121] Embodiment 15:

[0122] The raw materials in this example include: calculated based on 100 parts by weight, 6 to 10 parts by weight of sodium metasilicate, 0 to 4 parts by weight of triethanolamine oleate, 12 parts by weight of saturated isoalkane FDS166, 3 parts by weight of TX-10, 1 part by weight of diethanolamine laurate 6501, 2 parts by weight of alcohol ether carboxylate, and the balance water.

[0123] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.0~8.2.

[0124] Comparative Example 1

[0125] The raw materials in this example include: 6 parts by weight of nonionic surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 73 parts by weight of water, which are used to prepare a cleaning agent.

[0126] The nonionic surfactant alkylphenol polyoxyethylene ether TX-10 is compounded in an amount of 3 parts by weight and lauric acid diethanolamide 6501 is compounded in an amount of 3 parts by weight.

[0127] The saturated isoparaffin is FDS166.

[0128] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.5.

[0129] Comparative Example 2

[0130] The raw materials in this example include: 6 parts by weight of anionic surfactant, 8 parts by weight of sodium metasilicate, 2 parts by weight of oleic acid triacetamide, 11 parts by weight of saturated isomeric alkanes and 73 parts by weight of water, which are used to prepare a cleaning agent.

[0131] The saturated isoparaffin is FDS166.

[0132] The cleaning method in this example is: place the cleaning medium in the cleaning device and heat it to 80°C; connect the cleaning device to the engine through pipes and nozzles; when the engine is cold or slow running, the cleaning device atomizes the cleaning medium into 80-micron particles at a pressure of 0.4MPa and sprays it to the target area to be cleaned within 1 minute, and soaks the cleaning target area for 3 minutes. This process is one cycle, and the amount of cleaning medium used in each cycle is ≤20L; first use the cleaning agent to clean for 8 cycles, and then use the detergent to clean for 8 cycles; use the borescope to check whether there are local point deposits on some blades in the engine flow channel, no cleaning agent residue, and the pH value of the outflowing cleaning agent is 7.4.

[0133] Table 1

[0134]

[0135]

[0136] Experimental Example 1

[0137] The cleaning solvents and cleaning methods prepared in Examples 1-13 and Comparative Examples 1-2 were used to clean the engine flow passages. The test results of cleaning time, cleaning agent dosage, cleaning effect, pH value after cleaning, etc. are shown in Table 2:

[0138] Table 2

[0139]

[0140]

[0141] As can be seen from Table 1, the cleaning solvents prepared in Examples 1-9 of the present invention have a good cleaning effect on the engine airflow channel of an aircraft engine, and the cleaning time is shortened to within 1.5 hours. Examples 11-13 and Comparative Examples 1-2. After cleaning, the borescope inspection showed local point-shaped deposits. Example 10 and Comparative Example 1 showed large foam in the cleaning device.

[0142] Experimental Example 2

[0143] The cleaning solvents prepared in Examples 1-13 and Comparative Examples 1-2 were used to perform cleaning tests according to the requirements of GJB2841A-2021 "Specifications for Cleaning Agents for Aircraft Engine Gas Passages", as shown in Table 3:

[0144] Table 3

[0145]

[0146]

[0147] It can be seen from Table 2 that when the ratio of nonionic surfactant to composite surfactant is 10:1.4-3.5, its cleaning efficiency meets the requirement of ≥85% in the GJB2841A-2021 standard.

[0148] Experimental Example 3:

[0149] Example 14 was prepared according to the requirements of GJB2841A-2021 "Specifications for Aircraft Engine Gas Passage Cleaning Agents" and a cleaning test was performed, as shown in Table 4:

[0150] Table 4

[0151]

[0152]

[0153] It can be seen from Table 4 that when the ratio of nonionic surfactant to composite surfactant is 10:1.4-3.5, its cleaning efficiency meets the requirement of ≥85% in the GJB2841A-2021 standard.

[0154] Experimental Example 4:

[0155] Example 15 was prepared according to the requirements of GJB2841A-2021 "Specifications for Aircraft Engine Gas Passage Cleaning Agents" and a cleaning test was performed, as shown in Table 5:

[0156] Table 5

[0157]

[0158]

[0159] It can be seen from Table 5 that when the sodium metasilicate content is less than 7, greater than 9, and when the triethanolamine oleate content is less than 1, greater than 3, the cleaning efficiency decreases, and when the triethanolamine oleate content is 0, its resistance to hard water and accelerated storage stability can produce stratification.

[0160] Experimental Example 6:

[0161] The cleaning solvents prepared in Examples 1-13 and Comparative Examples 1-2 were used to conduct full immersion corrosion tests according to the requirements of Section 4.5.8 of GJB2841A-2021 "Specifications for Aircraft Engine Gas Channel Cleaning Agents", as shown in Table 6:

[0162] Table 6

[0163]

[0164] The changes in the full immersion corrosion of metal materials in Examples 1 to 13 are all smaller than those in the comparative example, and both the examples and the comparative example pass the full immersion corrosion test.

[0165] Finally, it should be noted that:

[0166] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aircraft engine flow channel cleaning agent, characterized in that: The raw materials include the following components by weight: 65-80 parts of water, 7-9 parts of sodium metasilicate, 5-8 parts of composite surfactant, 1-3 parts of triethanolamine oleate and 7-15 parts of saturated isomeric alkane.

2. The aircraft engine flow channel cleaning agent according to claim 1, characterized in that: The composite surfactant is compounded by a nonionic surfactant and an anionic surfactant in a weight ratio of 10:1.4-3.

5.

3. The aircraft engine flow channel cleaning agent according to claim 2, characterized in that: The nonionic surfactant is prepared by compounding at least two of alkylphenol polyoxyethylene ether, aliphatic polyoxyethylene ether and lauric acid diethanolamide.

4. The aircraft engine flow channel cleaning agent according to claim 2, characterized in that: The anionic surfactant is alcohol ether carboxylate.

5. The aircraft engine flow channel cleaning agent according to claim 1, characterized in that: The saturated isoalkane has a carbon chain content of 8-12 and a boiling point of 180-200°C.

6. The method for using the aircraft engine flow channel cleaning agent according to any one of claims 1 to 5, characterized in that: The steps include: S1. The cleaning agent is placed in the cleaning device and heated to 80-100°C; S2, the cleaning device is connected to the engine through pipes and nozzles; S3. When the engine is running cold or slow, the cleaning device atomizes the cleaning medium into particles of 50-100 microns at a pressure of ≤0.4MPa, sprays it to the target area to be cleaned within 0.5-1min, and soaks the cleaning target area for 1-3min. This process is one cycle, and the amount of cleaning medium used in a single cycle is ≤20L; S4, cleaning agent cleaning 5 to 10 cycles; S5. Clean the target area with detergent for 4 to 8 cycles until the detergent flows out clean and the pH value is 7-8; S6. Use borescope to check if there is any abnormality in the engine flow passage, and the cleaning target area is clean and has no cleaning agent residue.

7. The method for using the aircraft engine flow channel cleaning agent according to claim 6, characterized in that: The cleaning liquid is a mixed liquid of distilled water, soft water, pure water and anti-rust additives.

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