Nuclear grade composite silicate heat insulation material and its producing method

Abstract

The nuclear grade composite silicate heat insulating material has excellent heat insulating performance, high operation temperature, high resilience and no corrosion on metal apparatus and pipeline, and is suitable for use in nuclear grade apparatus and pipeline of nuclear reactor. It is elastic fibrous composite material with rich micro closed holes structure, and contains brucite fiber and / or ophiolite asbestos, sepiolite wool, aluminum silicate fiber, fast penetrant, modifying dispersant and water. It has soluble chlorine ion content not more than 100 ppm and total soluble silicate radical and sodium ion content not more than 10000 ppm. The production process of the material includes the steps of: sorting high grade material, treating brucite fiber and / or ophiolite asbestos, pulping and molding.

Description

Technical field: [0001] The invention relates to a nuclear-grade composite silicate thermal insulation material and a production method thereof. Specifically, the invention relates to a thermal insulation material suitable for high-temperature equipment and thermal pipelines of a reactor device and a production method thereof. Background technique: [0002] As insulation materials for reactor devices, metal reflective layer insulation materials have been used abroad since the 1970s, but due to the high cost and complicated process of this material, it has not been widely used. Later, for this topic, the research direction of the United States was mainly concentrated on mineral fiber cotton, while Russia was committed to the development of expanded perlite and slag wool materials, and Japan focused on the development of thermal insulation materials such as rock wool and microporous calcium silicate. [0003] At present, the thermal insulation materials for domestic reactor d...

AI Technical Summary

Problems solved by technology

However, in the process of overhauling such thermal insulation equipment, it was found that ultra-fine glass wool products often agglomerate after use, and become powdery after being twisted, and the thermal insulation performance is significantly reduced.

In addition, during installation and disassembly construction, there is still serious dust pollution, which endangers the health of workers and construction personnel.

Not only that, because the equipment and pipelines on the reactor device are irregular, in order to facilitate installation, the insulation material must be made into a profile corresponding to its shape before installation, thus increasing the production cycle and production cost of the insulation material

[0004] In addition, the existing silicate thermal insulation materials have poor thermal insulation performance, low service temperature, and low rebound rate; and the existing composite silicate thermal insulation materials have a tendency to corrode metals, such as austenitic stainless steel, so Affect the life and safety of insulated equipment and pipelines

Existing thermal insulation materials, such as the composite silicate thermal insulation profiles described in the ZL91111471.8 Invention Patent Specification, are not suitable for use in the thermal insulation applications of nuclear-level equipment and pipelines in reactor plants due to the above reasons