阅读说明：本技术 一种核级模块化保温层及其制备方法 (Nuclear-grade modular heat-insulating layer and preparation method thereof ) 是由 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 于 2019-11-11 设计创作，主要内容包括：本发明提供一种核级模块化保温层,它是由主体保温材料和外保护层材料组成,所述主体保温材料由热阻隔层材料和反射层材料层积复合而成；所述热阻隔层材料为耐辐照陶瓷纤维绝热复合材料耐辐照性能承受1.0×10<Sup>7</Sup>Gy以上剂量γ射线辐照,质量吸湿率不大于0.3％,憎水率不小于99.5％,25℃时导热系数不大于0.016W·m<Sup>-1</Sup>·K<Sup>-1</Sup>。本发明解决了现有金属保温层存在的重量大、异形件加工困难及非金属保温层存在的坍塌堆积、容重不均匀等问题,更好的保障装备或系统性能,具有广大的市场应用前景。本发明制备方法简单,适合大规模生产。(The invention provides a nuclear-grade modular insulating layer which is composed of a main body insulating material and an outer protective layer material, wherein the main body insulating 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 heat-insulating composite material with irradiation resistance of 1.0 multiplied by 10 7 The Gamma ray irradiation with the dosage of Gy is not more than 0.3 percent, the hydrophobic rate is not less than 99.5 percent, and the heat conductivity coefficient at 25 ℃ is not more than 0.016 W.m ‑1 ·K ‑1 . The invention solves the problems of heavy weight, difficult processing of special-shaped parts, collapse accumulation, uneven volume weight and the like of the existing metal heat-insulating layer and the non-metal heat-insulating layer, better ensures the performance of equipment or a system and has wide market application prospect. The preparation method is simple and suitable for large-scale production.)

1. Nuclear-grade modular heat preservationThe layer, it comprises main part insulation material and outer protective layer material, its characterized in that: the main body heat insulation material is formed by laminating and compounding a heat barrier layer material and a reflecting layer material; the thermal barrier layer material is an irradiation-resistant ceramic fiber heat-insulating composite material, and the irradiation resistance can bear the irradiation resistance of 1.0 multiplied by 10⁷The Gamma ray irradiation with the dosage of Gy is not more than 0.3 percent, the hydrophobic rate is not less than 99.5 percent, and the heat conductivity coefficient at 25 ℃ is not more than 0.016 W.m^-1·K^-1。

2. The insulation of claim 1, wherein: the radiation-resistant ceramic fiber heat-insulating composite material has a thermal conductivity coefficient of not more than 0.024 W.m at 200 DEG C^-1·K^-1。

3. The insulation of claim 1, wherein: the thickness of the thermal barrier layer material is 3 mm-6 mm.

4. The insulation of claim 1, wherein: the reflecting layer is made of high-reflectivity austenitic stainless steel foil or PI film coating.

5. The insulation of claim 1, wherein: the thickness of the high-reflectivity austenitic stainless steel foil is not more than 0.03 mm.

6. The insulation of claim 1, wherein: the PI film thickness of the PI film coating is 25-50 mu m, the coating material is austenitic stainless steel, and the coating thickness is 50-200 nm.

7. The insulation of claim 1, wherein: the outer protective layer is made of an austenitic stainless steel sheet with the thickness of 0.5-2 mm and the Co content of not more than 0.1 wt.% or a waterproof flexible woven fabric with the thickness of 0.4-0.8 mm.

8. The utility model provides a nuclear level modularization heat preservation, it comprises main part insulation material and outer protective layer material, its characterized in that: the main body protectorThe warm material is formed by laminating and compounding a thermal barrier layer material and a reflecting layer material, and the thickness of the thermal barrier layer material is 3-6 mm; the thermal barrier layer material is an irradiation-resistant ceramic fiber heat-insulating composite material with irradiation resistance of 1.0 multiplied by 10⁷The Gamma ray irradiation with the dosage of Gy is not more than 0.3 percent, the hydrophobic rate is not less than 99.5 percent, and the heat conductivity coefficient at 25 ℃ is not more than 0.016 W.m^-1·K^-1A thermal conductivity at 200 ℃ of not more than 0.024 W.m^-1·K^-1(ii) a The reflecting layer is made of high-reflectivity austenitic stainless steel foil or PI film coating; the thickness of the high-reflectivity austenitic stainless steel foil is not more than 0.03 mm; the PI film thickness of the PI film coating is 25-50 mu m, the coating material is austenitic stainless steel, and the coating thickness is 50-200 nm; the outer protective layer is made of an austenitic stainless steel sheet with the thickness of 0.5-2 mm and the Co content of not more than 0.1 wt.% or a waterproof flexible woven fabric with the thickness of 0.4-0.8 mm.

9. A method of making a nuclear grade modular insulation as claimed in any one of claims 1 to 8, using the steps of: firstly, carrying out purification pretreatment on a thermal barrier layer material, cutting and blanking the thermal barrier layer material and a reflective layer material by adopting an automatic cutting system, then laminating and compounding the two materials, and shaping the materials through a special die or a tool after the materials are qualified by inspection to form a main body heat insulation material; cutting and blanking an austenitic stainless steel sheet, forming a metal plate, performing surface treatment, performing precision assembly welding forming, passivating, sealing a gap and the like to form an austenitic stainless steel outer protective shell; filling and coating the main body heat-insulating material through the outer protective shell, and then carrying out protective layer sealing and surface treatment procedures to form a rigid heat-insulating layer; finally, after the spraying identification and the finished product inspection are qualified, packaging and warehousing are carried out.

10. A method of making a nuclear grade modular insulation as claimed in any one of claims 1 to 8, using the steps of: firstly, preparing the thermal insulation material of the main body of the flexible thermal insulation layer, wherein the process is the same as that of preparing the thermal insulation material of the main body of the rigid thermal insulation module. Then preparing an outer protective layer; cutting and blanking the waterproof flexible woven fabric by adopting an automatic cutting system, and sewing to obtain a woven fabric coating sleeve; cutting and blanking the stainless steel wire mesh according to actual conditions, and sewing the stainless steel wire mesh and the waterproof flexible woven fabric to form a composite coating sleeve; filling and coating the main body heat-insulating material in the coating sleeve, and sealing the protective layer; finally, after the spraying identification and the finished product inspection are qualified, packaging and warehousing are carried out.

Technical Field

The invention belongs to the field of heat insulating materials, and particularly relates to a nuclear-grade modular heat insulating layer and a preparation method thereof.

Background

When a nuclear reactor normally operates, high-temperature and high-pressure cooling media flow inside primary nuclear equipment and a pipeline, and heat insulation layers are required to be arranged on the outer surfaces of the equipment and the pipeline for heat insulation, so that heat loss is reduced. At present, nuclear-grade heat-insulating layers are mainly divided into two main types of metal heat-insulating layers and non-metal heat-insulating layers (such as irradiation-resistant glass wool and the like). For example: the metal heat-insulating layers provided by the patents US3904379A, CN1159062A and CN203131332U have the advantages of no dust generation, convenient assembly and disassembly, good decontamination property and the like, but the metal heat-insulating layers have heavy weight and are difficult to process complicated special-shaped pieces. For example: although the nonmetal organic material heat-insulating layers provided by the patents CN103174912A and CN103971761A are light in weight, the problems of radioactive dust, collapse and accumulation, uneven volume weight and the like are easily generated during installation and disassembly, and the health of personnel and the performance of equipment or a system are seriously affected.

Disclosure of Invention

Based on the problems of the existing nuclear-grade metal heat-insulating layer and the existing non-metal heat-insulating layer, the invention optimizes and improves the existing heat-insulating layer, provides a novel nuclear-grade modular heat-insulating layer, solves the problems of heavy weight, difficult processing of special-shaped pieces, collapse and accumulation of the non-metal heat-insulating layer, uneven volume weight and the like of the existing metal heat-insulating layer, and better ensures the performance of equipment or a system.

Except for special description, the parts are parts by weight, the percentages are mass percentages, and the concentration is mass percentage concentration.

The purpose of the invention is realized as follows:

the utility model provides a nuclear level modularization heat preservation, it comprises main part insulation material and outer protective layer material, its characterized in that: the main body heat insulation material is formed by laminating and compounding a heat barrier layer material and a reflecting layer material; the thermal barrier layer material is an irradiation-resistant ceramic fiber heat-insulating composite material, and the irradiation resistance can bear the irradiation resistance of 1.0 multiplied by 10⁷The Gamma ray irradiation with the dosage of Gy is not more than 0.3 percent, the hydrophobic rate is not less than 99.5 percent, and the heat conductivity coefficient at 25 ℃ is not more than 0.016 W.m^-1·K^-1。

The irradiation resistance of the invention can bear 1.0 multiplied by 10⁷Gamma ray irradiation of dosage above Gy means that the irradiation is subjected to 1.0 x 10⁷The phenomena of embrittlement, pulverization, shrinkage and the like are not obviously generated after gamma ray irradiation with dosage of more than Gy.

Furthermore, the radiation-resistant ceramic fiber heat-insulating composite material provided by the invention has the temperature of 200 DEG CThermal conductivity not greater than 0.024 W.m^-1·K^-1。

Furthermore, the thickness of the thermal barrier layer material is 3 mm-6 mm.

Furthermore, the reflecting layer material of the invention adopts high-reflectivity austenitic stainless steel foil or PI film coating; further, the high-reflectivity austenitic stainless steel foil has a thickness not greater than 0.03 mm; the PI film thickness of the PI film coating is 25-50 mu m, the coating material is austenitic stainless steel, and the coating thickness is 50-200 nm.

The outer protective layer material of the invention is an austenitic stainless steel sheet with the thickness of 0.5 mm-2 mm and the Co content of not more than 0.1 wt.% or a waterproof flexible woven fabric with the thickness of 0.4 mm-0.8 mm.

Concretely speaking, a nuclear level modularization heat preservation, it comprises main part insulation material and outer protective layer material, its characterized in that: the main body heat insulation material is formed by laminating and compounding a heat barrier layer material and a reflecting layer material, and the thickness of the heat barrier layer material is 3-6 mm; the thermal barrier layer material is an irradiation-resistant ceramic fiber heat-insulating composite material with irradiation resistance of 1.0 multiplied by 10⁷The Gamma ray irradiation with the dosage of Gy is not more than 0.3 percent, the hydrophobic rate is not less than 99.5 percent, and the heat conductivity coefficient at 25 ℃ is not more than 0.016 W.m^-1·K^-1A thermal conductivity at 200 ℃ of not more than 0.024 W.m^-1·K^-1(ii) a The reflecting layer is made of high-reflectivity austenitic stainless steel foil or PI film coating; the thickness of the high-reflectivity austenitic stainless steel foil is not more than 0.03 mm; the PI film thickness of the PI film coating is 25-50 mu m, the coating material is austenitic stainless steel, and the coating thickness is 50-200 nm; the outer protective layer is made of an austenitic stainless steel sheet with the thickness of 0.5-2 mm and the Co content of not more than 0.1 wt.% or a waterproof flexible woven fabric with the thickness of 0.4-0.8 mm.

The invention also provides a preparation method of the nuclear-grade modular heat-insulating layer. According to the characteristics of the insulated equipment or the pipeline, the modularized insulating layer is divided into a rigid insulating layer and a flexible insulating layer, and the types of main insulating materials of the rigid insulating layer and the flexible insulating layer are the same. The outer protective layer of the rigid heat-insulating layer is made of an austenitic stainless steel sheet with the thickness of 0.5-2 mm and the Co content of not more than 0.1 wt.%, and is suitable for flanges, valves and other parts needing to be frequently disassembled. The outer protective layer of the flexible heat-insulating layer is a waterproof flexible woven fabric with the thickness of 0.4 mm-0.8 mm. According to the actual situation, the outer protective layer of the flexible heat-insulating layer can be coated with the austenitic stainless steel wire mesh with the mesh size of 120-180 and the wire diameter of not more than 0.07mm, so that the flexible heat-insulating layer is suitable for pipelines, elbows, concentric reducing heads and the like.

The manufacturing process of the rigid heat-insulating layer suitable for flanges, valves and other parts needing to be frequently disassembled is shown in figure 1. The preparation method of the nuclear-grade modular insulating layer comprises the following steps: firstly, carrying out purification pretreatment on a thermal barrier layer material, cutting and blanking the thermal barrier layer material and a reflective layer material by adopting an automatic cutting system, then laminating and compounding the two materials, and shaping the materials through a special die or a tool after the materials are qualified by inspection to form a main body heat insulation material; cutting and blanking an austenitic stainless steel sheet, forming a metal plate, performing surface treatment, performing precision assembly welding forming, passivating, sealing a gap and the like to form an austenitic stainless steel outer protective shell; filling and coating the main body heat-insulating material through the outer protective shell, and then carrying out protective layer sealing and surface treatment procedures to form a rigid heat-insulating layer; finally, after the spraying identification and the finished product inspection are qualified, packaging and warehousing are carried out.

The manufacturing process of the flexible heat-insulating layer suitable for pipelines, elbows, concentric reducing heads and the like is shown in figure 2. The preparation method of the nuclear-grade modular insulating layer comprises the following steps: firstly, preparing the thermal insulation material of the main body of the flexible thermal insulation layer, wherein the process is the same as that of preparing the thermal insulation material of the main body of the rigid thermal insulation module. Then preparing an outer protective layer; cutting and blanking the waterproof flexible woven fabric by adopting an automatic cutting system, and sewing to obtain a woven fabric coating sleeve; cutting and blanking the stainless steel wire mesh according to actual conditions, and sewing the stainless steel wire mesh and the waterproof flexible woven fabric to form a composite coating sleeve; filling and coating the main body heat-insulating material in the coating sleeve, and sealing the protective layer; finally, after the spraying identification and the finished product inspection are qualified, packaging and warehousing are carried out.

Has the advantages that:

the invention provides a nuclear-grade modular heat-insulating layer, which integrates innovative design of a thermal control three-comprehensive composite heat-insulating structure for blocking conduction, inhibiting radiation and reducing convection, adopts an irradiation-resistant low-thermal-conductivity material as a heat-blocking layer, inhibits high-temperature thermal radiation by a plurality of layers of low-emissivity high-reflection films, and adopts an integrated tightly-combined interlayer closed structure to greatly reduce convection heat transfer. According to the invention, the specific radiation-resistant ceramic fiber heat-insulating composite material is used as a heat-blocking layer material, the high-reflectivity austenitic stainless steel foil or PI film coating layer is combined with a reflecting layer material for lamination and compounding to form a main body heat-insulating material, and the rigid heat-insulating layer or the flexible heat-insulating layer is manufactured according to the characteristics of heat-insulated equipment or a pipeline, so that the problems of heavy weight, difficulty in processing special-shaped parts, collapse and accumulation and uneven volume weight of a non-metal heat-insulating layer and the like of the conventional metal heat-insulating layer are effectively solved, the performance of equipment or a system is better ensured, and.

Drawings

FIG. 1 is a flow chart of a manufacturing process of a rigid insulation layer;

FIG. 2 is a flow chart of a manufacturing process of the flexible insulation layer.

Detailed Description

The present invention is described in detail below with reference to specific examples, which are given for the purpose of further illustrating the invention and are not to be construed as limiting the scope of the invention, and the invention may be modified and adapted by those skilled in the art in light of the above disclosure. The thermal barrier layer material is an irradiation-resistant ceramic fiber heat-insulating composite material, and can be prepared according to patent CN201911080427.6 (an irradiation-resistant ceramic fiber heat-insulating composite material and a preparation method thereof).