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毕业论文网 > 毕业论文 > 理工学类 > 新能源科学与工程 > 正文

高性能真空绝热材料制备与性能分析毕业论文

 2020-07-16 20:27:32  

摘 要

随着社会经济的快速发展,热力管道保温技术的应用规模越来越大,应用领域也越来越广,不仅适用于火电、核电等行业,在石油长输管线、海底原油输送等领域也得到了普遍应用。高性能保温隔热材料在热力工程的保温、节能、增效中占有极其重要的地位,它具有节约能源,降低热损,满足热端工艺要求,确保设备、人身安全,改善环境,提高经济效益等作用,是热力工程建设中的重要组成部分。

本文通过将多层金属化薄膜包覆不同直径的玻璃纤维芯材(含多组分吸气剂),使用真空热封工艺制备真空绝热板(VIP)。采用扫描电子显微镜(SEM)观察分析芯材表面和截面形貌,采用压汞法分析芯材孔径,采用热流法导热系数测试仪测试VIP热导率,并研究了纤维直径、纤维长径比、内压对VIP导热系数的影响规律,以及纤维直径对芯材孔径和高温高湿环境下VIP的耐老化性能的影响。结果表明:纤维直径从2.0μm增大至4.1μm时,VIP导热系数变化很微弱,随着纤维直径继续增大,导热系数急剧升高;长径比分布在2000~4000之间时导热系数极低;随着内压升高,在1Pa~10Pa区间内,导热系数缓慢升高,在10Pa~10000Pa区间,导热系数升高速率明显加快;随着纤维直径的降低,微孔数量增多、孔径减小,阻碍气体对流能力越强;纤维直径从7μm缩小至2.0μm时,抗老化能力增强了3倍。

关键词:保温 导热系数 真空绝热板 芯材

Preparation and Performance Analysis of High Performance Vacuum Insulation Material

ABSTRACT

With the booming development of economy, the need of energy saving and insulation in specific environment, apply scale and field of the pipe thermal insulation tech broadens, not only in thermal power and nuclear power industry but also generally in petroleum long pipe line, seabed raw petroleum transport. High performance insulation material imports in the insulation, energy saving and synergy of thermal engineering, it is able to save energy, reduce heat loss, satisfy hot end craft need, guarantee safety of device and people, improve environment and economy benefit, is important constituent of heat engineering construction.

This paper prepares VIP by vacuum heat-seal craft, laying multilayers metalizing membrane on glass fiber of different diameter (contain multicomponent getter). Observe and analyze material surface and section morphology by SEM, analyze material pore diameter by mercury intrusion method, test VIP heat conductivity by heat flow conductivity tester and researches the effect of fiber diameter, fiber length diameter ratio, and internal pressure on the heat conductivity of VIP, the effect of fiber diameter on bore diameter and ageing resistance under the high temperature and high humidity environment. Consequently, when fiber diameter increases from 2.0μm to 4.1μm, heat conductivity of VIP changes weakly and then with the continuous increase of fiber diameter, heat conductivity rise acutely. Heat conductivity presents low conduction under fiber length diameter ratio ranging from 2000 to 4000. With the increase of internal pressure, heat conductivity rises slowly from 1Pa to 10Pa, heat conductivity rises obviously fast from 10Pa to 10000Pa. With the reduce of fiber diameter, micro-pore increases and bore diameter shrinks, capacity of hindering convection becomes stronger. When fiber diameter shrinks from 7μm to 2μm, ageing resistance triples.

Keyword: Thermal insulation, Thermal conductivity, Vacuum insulation panel, Core material

目 录

摘要……………………………………………………………………………………………I

ABSTRACT……………………………………………………………………………………II

第一章 绪论…………………………………………………………………………………1

1.1背景与意义……………………………………………………………………………1

1.2真空绝热板介绍………………………………………………………………………1

1.3VIP研究现状……………………………………………………………………3

1.4 VIP的应用……………………………………………………………………………5

1.5本课题主要研究目的与内容…………………………………………………………5

第二章 材料制备及性能表征……………………………………………………………7

2.1 材料准备……………………………………………………………………………7

2.2 测试表征……………………………………………………………………………9

第三章 试验结果及分析…………………………………………………………………11

3.1纤维直径对不同内压下VIP导热系数影响………………………………………11

3.2 膜材结构……………………………………………………………………………17

3.3 VIP高温高湿环境耐老化性能影响研究…………………………………………17

第四章 结论与展望……………………………………………………………………21

4.1结论…………………………………………………………………………………21

4.2展望…………………………………………………………………………………21

第五章 经济分析……………………………………………………………………20

参考文献………………………………………………………………………………………21

致谢…………………………………………………………………………………………23

第一章 绪论

1.1背景与意义

随着社会经济的快速发展,热力管道保温技术的应用规模越来越大,应用领域也越来越广泛,不仅适用于火电、核电等行业,在石油长输管线、海底原油输送等领域也得到了普遍应用。不论是火电、核电还是石化供热管网行业,能源消耗日益增长,作为热能传递的重要组成部分,热力设备和管道都具备良好的节能潜力。

保温隔热材料在火电、核电等热力工程的保温、节能、增效中占有极其重要的地位,它具有节约能源,降低热损,满足热端工艺要求,确保设备、人身安全,改善环境,提高经济效益等作用,是热力工程建设中的重要组成部分。近年来国内外众多科研人员对高性能真空绝热材料进行了十分深入的研究并在该领域获得了长足进步。真空绝热板作为一种超级绝热保温材料自上世纪80年代以来有着极大的发展。

1.2 真空绝热板介绍

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