A structure for reducing heat loss in high temperature pipelines

Abstract

The invention discloses a structure capable of reducing heat loss of a high-temperature pipeline. The structure comprises a lining barrel, a metal spun silk net, a thermal insulation block, a metal barrel, a metal wire and a high-temperature pipeline outer shell; the metal spun silk net wraps the outer surface of the lining barrel; the lining barrel is sleeved by the metal barrel; the thermal insulation block is filled between the metal barrel and the metal spun silk net; the metal wire is bundled on the outer surface of the metal barrel; the high-temperature pipeline outer shell is positioned on the outermost layer of the structure for reducing the heat loss of the high-temperature pipeline. The structure disclosed by the invention can be used for realizing thermal protection of the high-temperature pipeline, and the design thickness of the high-temperature pipeline can be reduced, and the heat loss of an air flow in the pipeline can be reduced.

Description

technical field [0001] The invention relates to a structure for reducing heat loss of high-temperature pipelines. Background technique [0002] In the design of conventional superb wind tunnels, it is necessary to heat the airflow to increase the total temperature of the gas and prevent the condensation of the gas during the rapid flow process. The temperature of the heated gas often reaches above 800°C. The stress cannot meet the design requirements. If high-temperature alloy materials are used, the cost will be greatly increased. The high-temperature pipeline structures that can be referred to in domestic superb wind tunnel equipment are mostly coated with zirconium-containing high-purity refractory fiber cotton on the outside or coated on the inside. Covered with refractory fiber cotton structure, the outer surface coating scheme can prevent the temperature of the pipe wall from spreading to the space and play a role in heat insulation, but high-performance materials or i...

AI Technical Summary

Problems solved by technology

[0002] In the design of conventional superb wind tunnels, it is necessary to heat the airflow to increase the total temperature of the gas and prevent condensation of the gas during the rapid flow process. The temperature of the heated gas often reaches above 800°C. The stress cannot meet the design requirements. If high-temperature alloy materials are used, the cost will be greatly increased. The high-temperature pipeline structures that can be referred to by domestic superb wind tunnel equipment are mostly coated with zirconium-containing high-purity refractory fiber cotton on the outside or coated on the inside. Covered with refractory fiber cotton structure, the outer surface coating scheme can prevent the temperature of the pipe wall from spreading to the space and play a role in heat insulation, but high-performance materials or increasing the pipe wall thickness can meet the design requirements; the inner surface coating scheme can reduce the temperature of the pipe material The design temperature can reduce the design wall thickness, and can reduce the temperature of the pipe wall surface to play a role of heat insulation. However, in the actual use of this structure, the refractory fiber cotton is sucked out from the balance hole of the inner liner due to the air flow scouring and adsorption effect. If the inspection is not in place, the pipeline will overheat, exceed the design temperature, and creep fatigue rupture will occur. At the same time, the refractory fiber cotton sucked out by the air flow will enter the core of the wind tunnel such as the pressure regulating valve. component, causing partial failure of the component

[0003] In view of the performance requirements of high-temperature pipelines in conventional high-temperature wind tunnel equipment, it is necessary to design high-temperature pipelines that can be used continuously at a temperature above 800°C. The thermal protection effect of the high-temperature pipeline in the wind tunnel is not good, and it is necessary to check the thermal protection structure of the high-temperature pipeline in a short period of time to prevent structural damage, which brings great safety hazards to the use and operation of the overall equipment, so it needs to be solved in the structural design Pipeline thermal protection and structural stability meet the above requirements

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