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Heat preservation pipe prefabricated by powder heat insulating materials

A technology for prefabricating thermal insulation pipes and thermal insulation materials, which is applied in the direction of thermal insulation protection of pipelines, thermal insulation, pipeline protection, etc., can solve problems such as structural damage of thermal insulation materials, and achieve the effects of low comprehensive cost, reasonable structure and thin thermal insulation thickness.

Inactive Publication Date: 2010-05-12
董勖 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a prefabricated insulation pipe made of powder heat insulation material, which overcomes the deficiencies of the prior art and can effectively solve the problem of structural damage of the heat insulation material caused by the cold and heat deformation of the working steel pipe

Method used

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  • Heat preservation pipe prefabricated by powder heat insulating materials
  • Heat preservation pipe prefabricated by powder heat insulating materials
  • Heat preservation pipe prefabricated by powder heat insulating materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031]Example 1: ¢114 steel pipe is used as the working steel pipe, ¢168 steel pipe is used as the outer protective steel pipe, and there is a sliding support frame made of nano-silica aerogel as the heat-insulating liner ring 6, and both ends are also equipped with nano-silica airgel. The heat-insulating sealing plug 3 made of silica airgel, and the nano-silica airgel powder is filled in the heat-insulating chamber 4 in a natural accumulation form, so a new type of insulation pipe entity with a "tube-powder-tube" structure is made .When the 350°C heat transfer oil is transported in the working steel pipe 1, and kept for about 24 hours. Start the test and repeat the measurement many times: when the ambient temperature is about 18°C ​​(average value), after continuously transporting the heat medium for 24 hours, the outer The average surface temperature of the protective tube 2 is about 30°C, and the average temperature of the outer protective tube 2 at the sliding support frame...

example 2

[0032] Example 2: As described in Example 1, Example 2 uses a pipe-in-pipe device with the same structure and specifications, and fills the large-pore-volume silica powder in the heat-insulating cavity 4 to obtain the "tube-powder-tube" insulation Tube. According to the same method as Example 1, the average surface temperature of the outer protective tube 2 of the insulation pipe is about 35° C., and the average surface temperature of the outer protective tube 1 at the sliding support frame is about 40° C. When the temperature of the heat transfer oil conveyed in the working steel pipe 1 is repeatedly at normal temperature (15°C--20°C) or 350°C alternately, the structure of the overall heat preservation pipe remains unchanged, there is no heat leakage or heat dissipation of the bare pipe, and the outer protection of the heat preservation pipe There is no abnormality in the external temperature and internal insulation layer of tube 2, and the operation is good.

example 3

[0033] Example 3. As described in Example 2, Example 3 uses ¢273 steel pipe as the working steel pipe 1, and ¢400 rigid polyvinyl chloride double-wall corrugated pipe as the outer protective pipe 2, with a sliding support frame inside and two ends. Adiabatic sealing plug 3 made of nano-silica aerogel. The thermal insulation chamber 4 is filled with large pore volume inorganic powder material to make the thermal insulation layer 5, which is in a natural accumulation state and has a thickness of about 42 mm, which is a thermal insulation tube with a "steel-plastic" "tube-powder-tube" structure. At an ambient temperature of about 15°C to 20°C, heat flow is introduced into the working steel pipe 1, and the temperature continues to rise, and the external temperature is stabilized at several temperature points for 6 hours to test the external temperature. Whether the structure is damaged, the test data is as follows:

[0034] Heat flow temperature in working steel pipe

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Abstract

The invention discloses a heat preservation pipe prefabricated by powder heat insulating materials, comprising a working steel pipe and an external protective pipe. The external protective pipe is arranged at the outer side of the working steel pipe, and heat insulating drain plugs are arranged at two ends between the working steel pipe and the external protective pipe. The structure of the invention is reasonable and compact, powder materials are adopted for the heat insulating materials, the heat insulating structure cannot be destroyed, and the heat insulating performance cannot be influenced when the volume of a cavity formed between the working steel pipe and the external protective pipe changes, thereby a series of problems caused by the expansion because of heat and the contraction because of cold that are generated by temperature change during a heat transmission process are solved. The powder materials have lower coefficient of heat conductivity at the higher temperature, thereby energy-saving effect is obvious; because a supporting device is arranged in the cavity filled with the powder heat insulating materials, the heat insulating effect is good, and heat bridges are completely stopped; the heat preservation materials with the lowest coefficient of heat conductivity are used by the heat insulating materials, a heat isolating cushion ring and the heat insulating drain plugs, so that the integral heat preservation thickness of the heat preservation pipe is thin, the structure of the external protective pipe correspondingly becomes smaller, the quantity of installation and conveying is reduced, and the comprehensive manufacturing cost is low.

Description

1. Technical field [0001] The invention relates to a prefabricated heat preservation pipe, which is a prefabricated heat preservation pipe made of powder heat insulating material. 2. Background technology [0002] The engineering design of heat energy transmission or heat flow transmission generally adopts ground erection design or underground laying insulation pipe network design. The production of thermal insulation pipes adopts the factory prefabrication process, which can realize many advantages such as standardized production, quick and easy construction, low heat loss during operation, and remarkable energy-saving effect. It has developed rapidly in recent years. [0003] At present, there are many types of prefabricated insulation pipes sold in the market, but their structure is generally composed of protective pipes outside the working steel pipe sleeve, and the cavity clamps heat insulating materials (profiles or shells), among which: the working steel pipe (core pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L59/05
Inventor 董勖李海娟
Owner 董勖
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