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Method for restraining thermal oxidation coking and deposition of aviation fuel RP-3

A RP-3, aviation fuel technology, applied in heat exchange equipment, lighting and heating equipment, damage protection, etc., can solve problems such as sticking fuel control valves, polluting fuel nozzles and heat exchangers, failure of flight systems, etc.

Inactive Publication Date: 2010-11-24
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

As the reaction deepens, these complex products increase the viscosity of the fuel, and then undergo polymerization, condensation, and coagulation to form colloidal solid deposits, causing the fuel control valve to stick, and pollute the fuel nozzle and heat exchanger. In severe cases will cause the entire flight system to fail
If thermal oxidation coking cannot be effectively suppressed, it will greatly limit the engineering application of aero-engine heat exchangers

Method used

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  • Method for restraining thermal oxidation coking and deposition of aviation fuel RP-3
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  • Method for restraining thermal oxidation coking and deposition of aviation fuel RP-3

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Embodiment Construction

[0022] In order to realize the object of the present invention, the following technical scheme is adopted: the metal surface is pretreated by pickling, passivation and electrolytic polishing.

[0023] The pretreatment methods used include pickling, passivation and electropolishing of the metal surface. Chemical degreasing is used for degreasing: sodium hydroxide 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 temperature is 70-90°C, and the time is until the oil is removed. Or use electrochemical degreasing: sodium hydroxide 30-50g / L, sodium phosphate 20-30g / L, sodium carbonate 20-30g / L, water glass 3-5g / L. Total alkalinity 40~60g / L, temperature 60~80℃, current density 3~10A / dm 2 , Time: cathode 3 ~ 5min, anode 1 ~ 5min, electrode material steel or nickel-plated steel. The standard for clean degreasing is: wash with water after degreasing, and the water film will not crack for 30 seconds. Pickl...

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Abstract

The invention relates to a method for restraining and delaying the thermal oxidation coking and deposition of an aviation fuel RP-3 in an air-oil heat exchanger pipe and on a metal wall face of an aero-engine. In the method, a metal surface is pretreated and passivated, so that the catalytic activity of the surface to coking is reduced, the coking of the entire heat exchanger is reduced, the service life of the entire heat exchanger is prolonged, reliability is enhanced and maintenance cost is lowered. The pretreatment comprises the steps of performing acid-washing passivation and electrolytic polishing on the metal surface.

Description

technical field [0001] The invention relates to a method for inhibiting thermal oxidation coking and deposition of aviation fuel RP-3, in particular to a method for inhibiting thermal oxidation coking and deposition of aviation fuel RP-3 in an air / oil heat exchanger of an aircraft engine. Background technique [0002] With the development of the engine, the heat load of the engine will become heavier and heavier. In order to ensure the reliability of the flight and the corresponding stealth performance, effective measures must be taken to cool the hot end components. The cooling problem of engine hot-end components has become the bottleneck of aero-engine development to a large extent. From the perspective of heat transfer, the most effective method is to consider how to reduce the temperature of the cooling air itself and improve the quality of the cooling air itself under the premise that the amount of air-conditioning and the internal cooling structure cannot be changed s...

Claims

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Application Information

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IPC IPC(8): C23F17/00C23G1/08C23C22/50C25F3/24F28F19/00
Inventor 陶智邓宏武徐国强郭隽琚印超金迪
Owner BEIHANG UNIV
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