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Nuclear-grade modular thermal insulation layer and preparation method thereof

An insulating layer, nuclear-grade technology, applied in chemical instruments and methods, lamination, coating, etc., can solve the problems of difficult processing of special-shaped parts, uneven bulk density, large weight, etc., to ensure the performance of equipment or systems, the broad market Application prospects, the effect of reducing convective heat transfer

Active Publication Date: 2020-02-18
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the existing problems of the nuclear-grade metal insulation layer and non-metal insulation layer, the present invention optimizes and improves the existing insulation layer, and provides a new type of nuclear-grade modular insulation layer, which solves the problems of heavy weight and abnormal shape of the existing metal insulation layer. Difficult processing of parts and problems such as collapse and accumulation of non-metallic insulation layers, uneven bulk density, etc., to better guarantee equipment or system performance

Method used

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  • Nuclear-grade modular thermal insulation layer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] The maximum temperature on the surface of a valve is 200°C, the thickness of the insulation layer is 30mm, and a rigid insulation layer is used. The thermal resistance layer material in the main insulation material is a radiation-resistant ceramic fiber insulation composite material with a thickness of 3mm, and the reflective layer material is a 25μm-thick PI film coated with 50nm Thick 316L stainless steel, thermal resistance layer and reflective layer materials are compounded according to the designed lamination method, and then shaped through the valve mold to form the main insulation material of the valve insulation layer. The material of the outer protective layer is a 304 stainless steel sheet with a thickness of 0.5mm. After cutting and blanking, sheet metal forming, surface treatment, precision assembly and welding, passivation, gap sealing and other processes, an outer protective shell is formed. Fill and cover the main body insulation material, and finally carr...

Embodiment 2

[0025] The maximum temperature on the surface of a cylindrical device is 400°C, the thickness of the insulation layer is 85mm, and the outer protective layer is a flexible insulation layer of woven fabric. The material of the thermal resistance layer in the main insulation material is 6mm radiation-resistant ceramic fiber insulation composite material. The layer material is 316L stainless steel foil with a thickness of 0.03mm. The heat resistance layer and reflective layer materials are laminated according to the design, and then shaped by cylindrical tooling to form the main insulation material of the cylindrical equipment insulation layer. The material of the outer protective layer is a waterproof flexible woven fabric with a thickness of 0.8mm, which is cut by an automatic cutting system, and then made into a woven fabric covering sleeve after sewing. Finally, the main body insulation material is filled and coated in the coating sleeve, and the protective layer is sealed to ...

Embodiment 3

[0028] The maximum temperature on the surface of a pipeline is 280°C, and the thickness of the insulation layer is 50mm. The outer protective layer is a flexible insulation layer composed of woven fabric and wire mesh. The thermal resistance layer material in the main insulation material is 6mm radiation-resistant ceramic fiber insulation composite material. The material of the reflective layer is 316L stainless steel foil with a thickness of 0.03mm. The thermal resistance layer and the material of the reflective layer are combined according to the designed lamination method and then shaped by pipeline tooling to form the main thermal insulation material of the pipeline thermal insulation layer. The 0.4mm waterproof flexible woven fabric and the 0.07mm, 120-mesh 316L stainless steel wire mesh were cut, blanked, and compositely sewed to form a composite covering. Finally, the main body insulation material is filled and coated in the composite coating sleeve, and the protective l...

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Abstract

The invention provides a nuclear-grade modular thermal insulation layer which is composed of a main body thermal insulation material and an outer protective layer material; the main body thermal insulation material is formed by laminating and compounding a thermal barrier layer material and a reflecting layer material; the thermal barrier layer material is an irradiation-resistant ceramic fiber adiabatic composite material which is resistant to irradiation and can bear irradiation of gamma rays with the dosage of 1.0*10<7> Gy or above, the mass moisture absorption rate is not larger than 0.3%,the hydrophobicity is not less than 99.5%, and the heat conductivity coefficient is not larger than 0.016 W*m<-1>*K<-1> at the temperature of 25 DEG C. The problems that a conventional metal thermalinsulation layer is large in weight, special-shaped parts are difficult to process, and a non-metal thermal insulation layer collapses and accumulates and is uneven in volume weight are solved, the equipment or system performance is better guaranteed, and wide market application prospects are achieved. The preparation method is simple and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a nuclear-grade modular thermal insulation layer and a preparation method thereof. Background technique [0002] When the nuclear reactor is in normal operation, high-temperature and high-pressure cooling medium flows inside the primary nuclear equipment and pipelines. It is necessary to install an insulation layer on the outer surface of the equipment and pipelines for heat insulation to reduce heat loss. At present, the nuclear-grade insulation layer is mainly divided into two categories: metal insulation layer and non-metal insulation layer (such as radiation-resistant glass wool, etc.). For example: the metal insulation layer provided by patents US3904379A, CN1159062A, and CN203131332U has the advantages of no dust generation, convenient installation and disassembly, good decontamination, etc., but the metal insulation layer is heavy and difficult to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B18/00B32B15/02B32B15/14B32B15/18B32B27/12B32B27/28B32B33/00B32B37/02B32B38/00B32B38/18G21C11/08
CPCB32B5/02B32B15/02B32B15/14B32B15/18B32B27/12B32B27/281B32B33/00B32B37/02B32B38/0004B32B38/18B32B2255/10B32B2255/205B32B2262/103B32B2262/105B32B2307/304B32B2307/416B32B2307/714B32B2597/00G21C11/086Y02E30/30
Inventor 吴护林李忠盛黄安畏罗明波王征辉孙彩云蒋龙吴道勋周富周小淋
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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