Method for removing deposited carbon from aero-engine thrust augmentation fuel manifold

An aero-engine and afterburner fuel technology, applied in the field of aero-engines, can solve the problems of unsatisfactory cleaning effect, prolong the repair period, increase the repair cost, etc., and achieve the effect of saving cleaning time, improving cleaning speed, and fast peeling speed.

Inactive Publication Date: 2020-04-07
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the harsh working conditions of the new engine, the carbon deposits in the afterburner fuel main pipe are serious and stubborn. If the carbon deposits are removed by gasoline cleaning combined with ultrasonic vibration back pumping, the qualified rate of removing carbon deposits at one time is low. Cleaning and re-running the flow test not only increases the repair cost but also prolongs the repair cycle. The passing rate of the final flow and distribution test is only 70%, and the cleaning effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for removing carbon deposits in an afterburner fuel manifold of an aero-engine, comprising the steps of:

[0024] Step 1, high temperature lye cleaning:

[0025] Mix the sodium nitrite solution with a concentration of 200g / L and the sodium hydroxide solution with a concentration of 700g / L at a volume fraction ratio of 1:1, and add it to an ultrasonic cleaning tank, then heat the mixed solution to 120°C, and finally Immerse the fuel oil main pipe of SCAR in the high-temperature mixed solution for ultrasonic vibration soaking and cleaning for 20 minutes;

[0026] Step 2, wash with water:

[0027] Take out the afterburner fuel main pipe after the lye cleaning in step 1, then put it into hot water at 80-100°C for 5 minutes, then put it in cold water at room temperature for 5 minutes, and then dry it with clean compressed air at 120°C ;

[0028] Step 3, back pumping by ultrasonic oscillation:

[0029] Put the afterburner fuel main pipe washed and dried in step 2...

Embodiment 2

[0032] A method for removing carbon deposits in an afterburner fuel manifold of an aero-engine, comprising the steps of:

[0033] Step 1, high temperature lye cleaning:

[0034] Mix the sodium nitrite solution with a concentration of 240g / L and the sodium hydroxide solution with a concentration of 650g / L at a volume fraction ratio of 1:1, and add it to an ultrasonic cleaning tank, then heat the mixed solution to 130°C, and finally Immerse the fuel oil main pipe of SCAR in the high-temperature mixed solution for ultrasonic vibration soaking and cleaning for 20 minutes;

[0035] Step 2, wash with water:

[0036] Take out the afterburner fuel main pipe after the lye cleaning in step 1, then put it into hot water at 80-100°C for 5 minutes, then put it in cold water at room temperature for 5 minutes, and then dry it with clean compressed air at 120°C ;

[0037] Step 3, back pumping by ultrasonic oscillation:

[0038] Put the afterburner fuel main pipe washed and dried in step 2...

Embodiment 3

[0041] A method for removing carbon deposits in an afterburner fuel manifold of an aero-engine, comprising the steps of:

[0042] Step 1, high temperature lye cleaning:

[0043] Mix the sodium nitrite solution with a concentration of 260g / L and the sodium hydroxide solution with a concentration of 600g / L at a volume fraction ratio of 1:1, and add it to an ultrasonic cleaning tank, then heat the mixed solution to 140°C, and finally Immerse the fuel oil main pipe of SCAR in the high-temperature mixed solution for ultrasonic vibration soaking and cleaning for 25 minutes;

[0044] Step 2, wash with water:

[0045] Take out the afterburner fuel main pipe after the lye cleaning in step 1, then put it in hot water at 80-100°C for 5 minutes, then put it in cold water at room temperature for 5 minutes, and then dry it with clean compressed air at 120°C ;

[0046] Step 3, back pumping by ultrasonic oscillation:

[0047]Put the afterburner fuel main pipe washed and dried in step 2 in...

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PUM

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Abstract

The invention discloses a method for removing deposited carbon from an aero-engine thrust augmentation fuel manifold, and belongs to the technical field of aero-engines. According to the method basedon the oxidation-reduction effect of high-temperature alkali liquor, deposits as deposited carbon in the surface of a part is loosened by oxidation-reduction and thus peeled from the matrix surface, deposited carbon in the thrust augmentation fuel manifold is separated from the pipe wall by oscillation and taken away from an oil inlet pipe connecting nozzle through oil by means of an ultrasonic oscillation reverse suction force, and the deposited carbon is removed. Via the method, it is guaranteed that a chromium layer of the oil inlet pipe connecting nozzle is not damaged, deposited carbon ofthe novel engine thrust augmentation fuel manifold can be efficiently removed in a quality-guaranteeing mode, and the qualified rate of deposited carbon removal of the thrust augmentation fuel manifold reaches 95%.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, and in particular relates to a method for removing carbon deposits in an afterburner fuel main pipe of an aero-engine. Background technique [0002] During the working process of an aero-engine, the scorched substances produced by unsaturated olefins and colloids in the fuel at high temperature are called carbon deposits. Carbon deposits are generated inside and outside the spray rod (hole), and the carbon deposits block the fuel injection holes, resulting in a decrease in the effective area of ​​the fuel injection holes and a decrease in the flow rate of the fuel manifold. Aero-engine afterburner fuel headers have high sealing requirements. Carbon deposits and oil stains remain on the inner and outer surfaces of engine fuel headers and nozzles, making cleaning difficult, manifested as header blockage by carbon deposits, flow and distribution tests exceeding standards, etc. Therefore, from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08B08B3/12B08B3/10C23G3/04C23G1/14
CPCB08B3/08B08B3/106B08B3/12B08B2203/007C23G1/14C23G3/04
Inventor 李丹蓝天霞王邦赛林成周建平
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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