Fire-proof device of pressurizing nitrogen-making oil tank and working method thereof

A fire prevention device and fuel tank technology, applied in the direction of fuel tank safety measures, etc., can solve the problems of reducing the concentration of nitrogen-rich gas in the engine bleed air and affecting the deoxygenation efficiency of the fuel tank, so as to improve energy utilization efficiency, improve nitrogen production efficiency, and reduce oxygen concentration Effect

Active Publication Date: 2018-04-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest advantage of the hollow fiber membrane separation air nitrogen and oxygen removal system is that it can realize the deoxygenation of the fuel tank in a fully enveloped manner, with high efficiency and a simple and compact device structure. The gas often cannot reach the pressure required for separation, resulting in a decrease in the concentration of nitrogen-rich gas, which affects the deoxygenation efficiency of the fuel tank

Method used

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  • Fire-proof device of pressurizing nitrogen-making oil tank and working method thereof
  • Fire-proof device of pressurizing nitrogen-making oil tank and working method thereof
  • Fire-proof device of pressurizing nitrogen-making oil tank and working method thereof

Examples

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Effect test

Embodiment 1

[0040] Such as figure 1 as shown, figure 1It is a self-pressurized separated air flushing system for deoxygenating the aircraft fuel tank of the pressurized nitrogen-generating fuel tank fire prevention device of the present invention. The system includes a first cooler 3, a water separator 4, a temperature sensor 5, a first flow regulating valve 6, Hollow fiber membrane 7, second flow regulating valve 9, oxygen concentration sensor 10, fuel tank 11, stop valve 101, second cooler 104, first three-way valve 105, controller 106, second three-way valve 201, fan 202. Wherein the first cooler 3 and the second cooler 104 are provided with a hot side channel and a cold side channel, the water separator 4 is provided with a gas channel and a liquid water channel, and the hollow fiber membrane 7 is provided with a gas inlet, a nitrogen outlet and an oxygen outlet, The outlet of the shut-off valve 101 and the inlet of the first three-way valve 105 are connected by pipelines, followed b...

Embodiment 2

[0045] Such as figure 2 as shown, figure 2 It is a system diagram of the device of the present invention using the gas pan stone to wash the aircraft fuel tank to remove oxygen. In this embodiment, the gas outlet of the second flow regulating valve 9 is connected to the gas inlet of the gas pan stone 203 through a pipeline, and the gas pan stone 203 is installed at the bottom of the fuel tank 11. And the gas pan stone 203 is installed at the bottom of the oil tank 11; the gas pan stone is made of white corundum and silicon carbide which can be sintered at high temperature.

[0046] The difference between this embodiment and Embodiment 1 is that the gas leaving the nitrogen outlet of the hollow fiber membrane 7 no longer enters the gas inlet of the upper part of the oil tank 11 but enters the gas inlet of the gas pan stone 203 and generates a large number of fine bubbles in the gas pan stone 203. The fuel is washed to replace the oxygen in the fuel, reduce the oxygen concent...

Embodiment 3

[0048] image 3 It is a system diagram of the combined deoxygenation system of gas pan stone and turbo expander of a kind of pressurized nitrogen-generating fuel tank fire protection device of the present invention. This embodiment adds the system diagram of deoxygenation of aircraft fuel tank of turbo expander 107 in Embodiment 2. In the embodiment, a turbo expander 107 is connected between the nitrogen outlet of the hollow fiber membrane 7 and the second flow regulating valve 9 through a pipeline, and the turbo expander 107 is connected to the compressor 2 through a connecting rod.

[0049] The difference between Embodiment 3 and Embodiment 1 and Embodiment 2 is that the high-pressure nitrogen gas generated at the nitrogen outlet of the hollow fiber membrane 7 first passes through the turbo expander 107 to expand, cool down, and then enter the second flow regulating valve 9, and at the same time, the high-pressure nitrogen gas passes through the turbo expander 107. The power...

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Abstract

The invention discloses a fire-proof device of a pressurizing nitrogen-making oil tank and a working method thereof, and belongs to the technical field of fire and explosion protection. Bleed air pressure of an engine is increased by using a self-pressurizing mode, and a nitrogen gas with high concentration is separated from the bleed air through a hollow fiber membrane after impurity removing anddrying and is injected to the oil tank through a control system according to the need so that oxygen gas in the oil tank is removed; in addition, a turbo expander and a compressor are combined for generating expansion work, the work output by the expander drives the compressor to compress the bleed air of the engine, the gas pressure is further increased so as to reach the needed pressure of thehollow fiber membrane for separation, and nitrogen-making efficiency is improved. Nitrogen-enriched gas is charged into the oil tank, oxygen content in the oil tank is reduced, and a flow of the gas can be regulated by automatically controlling devices in a nitrogen-charging process, so that needed inert gas is generated. The oil tank is located in a non-combustion state, and the purpose of fire and explosion protection is achieved. The fire-proof device can be automatically controlled, and has the advantages of high inerting efficiency, less energy consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of fire prevention and explosion protection, and specifically refers to a fire prevention device for a pressurized nitrogen-making fuel tank and a working method thereof. Background technique [0002] Aircraft fuel tank combustion explosion is the main cause of aircraft crashes. During aircraft refueling, maintenance or flight, due to the existence of static electricity, lightning or external ignition sources, fuel tank fires cause safety accidents. For military aircraft, the flight conditions are even worse. Under the attack of artillery fire and projectiles in wartime, it is more likely to cause fire, cause aircraft crash and death, and cause heavy losses. [0003] There are two effective methods for fire and explosion protection of aircraft fuel tanks: controlling flame transfer and changing the fuel explosion limit. The corresponding technical solutions can be divided into passive and active. The passiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D37/32
CPCB64D37/32Y02T50/40
Inventor 李超越冯诗愚彭孝天邵垒刘卫华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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