Inhibition to oxidation coking of aviation kerosene by acid cleaning and passivation

A technology of aviation kerosene and coking, which is applied in the direction of damage protection, pipeline protection, pipeline anticorrosion/rust protection, etc. It can solve the problems of hidden dangers of engines, easy breakage, and affecting heat exchange efficiency, etc., and achieves inhibition of coking, not easy to fall off, and easy to use Effect

Inactive Publication Date: 2010-05-26
BEIHANG UNIV
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Problems solved by technology

However, this method is not suitable for aero-engines. First, the texture of the ceramic casing is relatively brittle, and it is easy to break under a certain frequency of vibration, which brings great hidden dangers to the engine. Second, adding ceramic tubes will affect the heat transfer efficiency. The heat exchanger cannot achieve the expected effect; third, the ceramic tube will increase the weight of the engine, thereby reducing the overall performance of the engine

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  • Inhibition to oxidation coking of aviation kerosene by acid cleaning and passivation
  • Inhibition to oxidation coking of aviation kerosene by acid cleaning and passivation

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Embodiment Construction

[0013] This scheme is to change the metal activity of the metal surface by pre-treating the metal surface, so as to achieve the purpose of inhibiting the oxidation and coking of kerosene. Water washing-passivation-water washing-neutralization-water washing-drying-dehydrogenation. The key steps are described below:

[0014] 1. Degreasing. Degreasing consists of two steps: preliminary degreasing and chemical degreasing. First use gasoline for preliminary oil removal, slowly pass the gasoline through the metal pipe (0.3g / s) to fully dissolve the dirty oil in the pipe wall, and increase the gasoline flow rate (2-4g / s) after passing the oil for 15 minutes, so that It washes away oil stains. Before chemical degreasing, put the metal into the air circulation furnace to fully volatilize the gasoline in the tube. Chemical degreasing uses sodium oxide 60-80g / L, sodium phosphate 20-40g / L, sodium carbonate 20-40g / L, sodium silicate 3-10g / L. The total alkalinity is 65-100g / L, the temp...

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Abstract

The invention discloses a method for inhibiting oxidation coking of kerosene at high temperature (of between 150 and 400DEG C) effectively. High-concentration pickling solution is used for passivation treatment on the metal surface to reduce the metal surface activity and effectively weaken the catalysis of metal ions in the kerosene coking process; and the method can effectively inhibit the kerosene coking process and also can effectively reduce the attachment of the kerosene coke to the pipe wall.

Description

technical field [0001] The invention relates to a method for inhibiting the oxidation and coking of aviation kerosene, in particular to a method for inhibiting the oxidation and coking of aviation kerosene at high temperature in the pipeline of an aircraft engine, which can be widely applied to the inner surface of the kerosene pipeline to inhibit the formation of oxidative coking of the kerosene and its attachment to the tube wall. Background technique [0002] With the improvement of engine performance requirements, the temperature before the turbine of the engine will further increase, which will bring more difficulties to the cooling of high-temperature components; at the same time, the pressure ratio of the compressor will also increase, and the gas temperature at the outlet of the compressor will also increase accordingly, which will Greatly reduce its quality as a cooling medium for high temperature components. In order to solve this contradiction, using kerosene as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L58/00F02C7/22C23G1/19C23G1/08C23C22/24
Inventor 罗翔丁水汀邓宏武闻洁黄文金迪
Owner BEIHANG UNIV
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