Method for improving cracking and stable performance of jet fuel

A jet fuel, stable technology, applied in the direction of hydrocarbon oil cracking, petroleum industry, etc., can solve the problems of heat-absorbing fuel hypersonic aircraft heat management process is rare, carbon deposits, catalyst service life is short and so on, to improve fuel cracking rate, Effect of improving heat sink and prolonging service life

Active Publication Date: 2012-10-17
TIANJIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the existing catalytic cracking technology can increase the cracking rate of jet fuel, but there are disadvantages such as short service life of the catalyst and excessive carbon deposition in the cracking process.
Hydrogen donors have been widely used in coal liquefaction, naphtha reforming, and oil treatment, but the synergistic use of catalysts and hydrogen donors in thermal management of endothermic fuel hypersonic aircraft is still rare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A supercritical endothermic fuel pyrolysis and coking evaluation platform was used to simulate the cracking and coking of fuel in the heat exchange system of a hypersonic aircraft, and n-dodecane was selected as the probe fuel. Using the method of Chinese patent CN200710058969.4, the ZSM-5 molecular sieve membrane is coated on the inner surface of the tubular reaction tube, the outer diameter of the tube is 3mm, the inner diameter is 2mm, and the coating amount of ZSM-5 molecular sieve is 2mg / cm 2 ; The hydrogen-donating agent is tetrahydronaphthalene, and its added concentration is 2wt.%.

[0017] The pyrolysis reactor is set to have a temperature of 600°C in the experimental section, a pressure of 4MPa, a reaction time of 2 hours, and a feed mass space velocity of 300h -1 .

[0018] Experimental conditions and operation are the same as in Example 1, and the hydrogen-donating agent tetrahydronaphthalene is replaced by: decahydronaphthalene, benzyl alcohol, ...

Embodiment 9

[0019] Embodiment 9: Experimental condition and operation are the same as embodiment 1. The difference is that the catalyst is ZSM-5 molecular sieve (purchased from Catalyst Factory of Nankai University) loaded with Pd and Pt (the loading amount is 1wt.%, the mass ratio of Pd and Pt is 1:1).

Embodiment 10

[0020] Embodiment 10: Experimental condition and operation are the same as embodiment 1. The difference is that the catalyst is coated with Y-type molecular sieve (purchased from Nankai University Catalyst Factory) in the tubular reaction tube, and the coating amount of molecular sieve is 3mg / cm 2 , choose n-dodecane with a sulfur content of 200ppm as the probe fuel. The hydrogen-donating agent is tetrahydronaphthalene, and its added concentration is 4wt.%.

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Abstract

The invention discloses a method for improving the cracking and stable performance of jet fuel, which comprises the following steps of: coating a catalyst on the inner wall surface of a heat exchanging pipeline and adding a proper amount of hydrogen donor into the jet fuel. The method can reduce the generation of deposited carbon and prolong the service life of the catalyst while ensuring the catalytic cracking and heat absorption of the jet fuel in a heat exchanging system. The selected hydrogen donor is cyclane or cycloalkyl aromatic hydrocarbon containing 1-2 naphthenic rings, or the cycloalkyl aromatic hydrocarbon in which substitutions of oxygen, nitrogen, sulfur and the like occur on a cycloalkyl; the catalyst is one or more from a ZSM-5, or a Y-shaped or beta-shaped molecular sieve, or one or more from the ZSM-5, or the Y-shaped or beta-shaped molecular sieve loading one or more noble metals of Pd, Pt, Ag or Ni. The method can improve the high heat stability of the fuel and prolong the service life of the catalyst while effectively improving the cracking speed of the jet fuel and improving the fuel heat sink.

Description

technical field [0001] The present invention relates to a method for increasing the cracking rate of jet fuel, especially a method for improving the cracking and stability performance of jet fuel, which can promote the endothermic cracking of hydrocarbon fuel and improve the high thermal stability of fuel, and prolong the service life of the catalyst method. Background technique [0002] The improvement of the operating speed of the next-generation aircraft needs to increase the thrust ratio of the engine, and increasing the compression pressure of the engine air compressor is an effective way to increase the thrust ratio. Due to the increase in the compression pressure of the air compressor and the large amount of aerodynamic friction heat generated by flying under hypersonic conditions, the temperature of the surface material of the aircraft engine has greatly increased, which poses a great challenge to the high temperature resistance of the material. In view of the curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G47/36C10G47/34C10G47/20C10G47/18
Inventor 刘国柱蒋榕培张香文王莅米镇涛
Owner TIANJIN UNIV
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