Double-flow-mode fuel oil ground pre-washing method and device thereof

Abstract

The invention discloses a double-flow-mode fuel oil ground pre-washing method and device thereof. The double-flow-mode fuel oil ground pre-washing method comprises the following steps of: performing inertia treatment on fuel oil in an oil tank of a fuelling vehicle by using nitrogen-rich gas generated by a nitrogen-rich gas generating device, wherein the nitrogen-rich gas generating device comprises more than two nitrogen-rich gas generators, and the nitrogen-rich gas outlets of the nitrogen-rich gas generators are connected in series or in parallel or in series and parallel by switching bypass control valves respectively; and during inertia treatment on fuel oil, switching corresponding bypass control valves to make the flow and the purity of nitrogen-rich gas output by the nitrogen-rich gas generating device meet the practical requirements of inertia treatment, and arranging a suction pump at the nitrogen-rich gas outlet of each nitrogen-rich gas generator respectively. Due to the adoption of the method and the device, the contradictory relation between the flow and purity of nitrogen-rich gas generated by the nitrogen-rich gas generators in a decompressed washing process is coordinated, the separating effect of a separating film is optimized, the requirement of lower oxygen content in fuel oil at the end of washing is met, and washing time is reduced.

Description

technical field [0001] The invention belongs to the technical field of aircraft fire and explosion protection, and relates to an aircraft fuel inerting method and device, in particular to a double-flow mode decompression fuel ground pre-washing method and device. Background technique [0002] With the increasingly perfect military aircraft system, increasingly sophisticated equipment, and increasingly expensive aircraft cost, the safety of aircraft has been widely valued. The crash of TWA Flight 800 in July 1996 made the Federal Aviation Administration (FAA) pay more and more attention to the safety of fuel tanks. Our country is also paying more and more attention to the research of fuel tank inertization, and related research is urgently needed, especially in today's life and safety first, improving aircraft safety has become the primary issue in the design process. Fuel tank inerting technology is to reduce the oxygen concentration in the gas phase space of the fuel tank ...

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Problems solved by technology

[0005] In addition, at present, a single-flow mode of fuel oil floor washing is generally used. In this washing mode, the oxygen concentration in the fuel oil is initially high, and the use of a higher flow rate of nitrogen-enriched gas to wash the fuel oil will reduce the oxygen content in the fuel oil. Decrease rapidly, but high-flow scrubbing will inevitably bring about an increase in the oxygen concentration of nitrogen-enriched gas (NEA), which will cause an increase in the oxygen content in the final fuel oil after scrubbing

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