Intermittent spring inhibition pipeline for low-temperature liquid fuels

Abstract

The invention discloses an intermittent spring inhibition pipeline for low-temperature liquid fuels. The pipeline comprises a main body pipeline connected to the lower portion of a low-temperature liquid fuel storage tank, a heat insulation layer is arranged on the outer side of the main body pipeline, a backflow baffle is arranged in the main body pipeline, the backflow baffle is connected with the main body pipeline to ensure that the backflow baffle is located at the eccentric position of the main body pipeline, and meanwhile, the length of the backflow baffle is smaller than the total length of the main body pipeline to ensure that a liquid backflow gap is reserved at the bottom of the main body pipeline. The backflow baffle is additionally arranged in the main body pipeline, and thenthe inhibition effect on intermittent spring is achieved through the liquid circulation capacity of the main body pipeline; and the pipeline has the advantages of simple structure, light weight, easiness in process implementation, safety and reliability, meanwhile, the weight of equipment additionally introduced for inhibiting intermittent spring is greatly reduced, and the operation and maintenance costs of the equipment are also reduced.

Description

technical field [0001] The invention belongs to the technical field of fluid delivery pipelines, in particular to a low-temperature liquid fuel geyser suppression pipeline. Background technique [0002] Cryogenic liquid fuels (liquid hydrogen, liquid oxygen, liquefied natural gas) have excellent properties of non-toxic, non-polluting and high specific impulse, and are widely used in the fields of industrial energy and aerospace propulsion. Due to the low boiling point and small latent heat of low-temperature fuel, under the action of environmental heat leakage, two-phase flow phenomenon will inevitably appear in the pipeline of low-temperature fuel, which will have an adverse effect on the stable transportation of fluid; more seriously, in a long In the vertical pipeline, the bubbles generated by the boiling of the liquid cannot be discharged in time, which may cause geysers in the pipeline. During the geyser process, the gas-liquid mixture in the pipeline gushes at high sp...

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Problems solved by technology

[0004] According to the above-mentioned geyser generation and suppression mechanism, in engineering practice, for example, in the main delivery system of rocket cryogenic fuel, an additional circulation return pipeline is added and supplemented by helium injection to make the gap between the main delivery pipeline and the return pipe The circulating flow of the fluid is used to suppress the geyser; the system process of this suppression scheme is extremely complicated, and due to the introduction of additional auxiliary equipment, the weight of the rocket is significantly increased, thereby reducing the payload of the rocket

The Chinese utility model patent with the publication number 205479929U discloses "Installation structure for low-temperature liquid transport wear-resistant pipeline". This structure adds a concentric circular tube to the main liquid transport pipeline to generate fluid circulation to suppress geysers. Similarly, due to the introduction of concentric pipes, the overall weight of the pipe increases, and at the same time, the flow resistance of the fluid in the pipe increases, resulting in additional energy consumption

Another geyser suppression scheme is to continuously inject low-temperature liquid at the bottom of the main pipeline to maintain the flow state of the fluid in the pipeline; this scheme requires continuous injection of low-temperature fluid, which on the one hand causes waste of low-temperature liquid, and on the other hand On the one hand, it is not conducive to long-term operation and maintenance

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