水泥工业热电偶使用经验及技术进展

本文主要介绍以水泥工业为代表的高温高尘烟气温度测量用热电偶的误差原因、损坏故障分析及提出工作中如何提高热电偶的寿命和精度的建议,并介绍了一些最近的技术进展。     

热电偶高温测量应注意的问题

介绍高温测量中常用的热电偶 ,论述用热电偶进行高温测量时测量误差的成因 ,并提出减小误差的措施及测量方法。     

恒创研发高柔性环氧树脂

<正>恒创绝缘材料高柔性环氧树脂面世。姜堰市恒创绝缘材料有限公司联合有关院校,最近开发成功一系列高柔性环氧树脂,型号为102C-4H、102C-5H。该树脂为浅色和深色粘稠液体,常温下可和脂肪胺、芳香胺等反应,中高温下可和双氰胺或酚醛树脂等反应;主要用于结构胶粘剂中,固化后形成环氧树脂-聚氨酯互穿聚     

高温气体的温度测量方法

一、前言工业装置的火焰或高温气体的热传导过程,例如在锅炉燃烧室、工业窑炉、燃气轮机以及汽轮机、喷气机、过热器、换热室、蓄热室、热交换器等场合,为了计算热量平衡和热效率等,正确测量气体的温度是必要的。作为测定高温气体温度的方法,应用得最广泛的要数热电偶了。热电偶虽有很高的精确度,但与其它测量温度的仪器一样,在测量气体温度时因测定条件而存在很大的误差。即在测定气体温度时,存在着和测量固体或液体的温度所不同的条件。本文在叙述了关于测量高温气体温度的一般情况后,再说     

高导热绝缘材料的研究进展

主要介绍了高导热绝缘材料的应用以及导热填料对高导热绝缘材料性能的影响因素。重点介绍了填料种类、尺寸、表面处理和加入量对于导热绝缘高聚物性能的影响,并分析了高导热绝缘材料的未来研究方向。     

硫化氢焚烧炉的温度控制和测量

针对硫化氢焚烧炉炉膛温度高及温度控制的严格要求，介绍了红外高温测温仪的特点、功能及其工作原理，比较了它与热电偶测温的优缺点，实践证明红外高温测温仪具有温度测量精度高、使用寿命长、性能稳定等特点。     

陶瓷绝缘材料高温电阻的测量

由于电除尘器用陶瓷绝缘子在高温环境下运行,在生产和验收过程中必须对其高温电阻进行控制和检测。介绍了陶瓷绝缘材料高温电阻的测量方法、电化时间、升温方式和测量操作,探讨了试样选择及处理、电极选择、温度控制,指出应根据不同测量目的采用不同的测量方法,尽量克服测量误差,提高精确度。     

高柔性聚氨酯环氧树脂新品问世

<正>姜堰市恒创绝缘材料有限公司联合有关院校,日前开发成功一系列环氧预浸料专用增韧剂产品——高柔性聚氨酯环氧树脂,型号为102D–1及102D–1H。该树脂为黄色或红色高黏稠液体或半固体,常温下可和脂肪胺、脂环胺、芳香胺等反应,中高温下可和双     

氮化硼的合成方法

六方晶体氮化硼在高温作为容器材料或者作为高电压电阻绝缘材料,具有广泛的应用领域。因而,氮化硼的合成方法,有许多     

高柔性聚氨酯环氧树脂新品问世

<正>姜堰市恒创绝缘材料有限公司联合有关院校,日前开发成功一系列环氧预浸料专用增韧剂产品——高柔性聚氨酯环氧树脂,型号为102D-1及102D-1H。该树脂为黄色或红色高黏稠液体或半固体,常温下可和脂肪胺、脂环胺、芳香胺等反应,中高温下可和双氰胺或酚醛树脂、酸酐等反应,主要用于环氧     

加氢装置高压反应器床层温度测量

通过柴油加氢装置反应系统温度测量方式不同方案的对比,提出采用新型的热电偶提高加氢装置高压反应器床层温度测量的精确性,实现柴油加氢装置反应系统温度平稳控制。     

高压蒸汽管道保温研究

计算了不同管径和保温厚度下蒸汽管道输送高压蒸汽的热损失和温度降。结果表明:保温厚度越大,蒸汽的热损失越小、温度降越小;保温材料导热系数与蒸汽的热损失呈正比;环境温度越高,蒸汽的热损失越小;环境风速对热损失的影响不大。同时研究了保温材料选择和保温结构对节能的影响。     

Temperature measurement performance of thin-film thermocouple cutting tool in turning titanium alloy

The measurement of cutting temperature is one of the most important research topics in the field of cutting. Traditional technology for cutting temperature measurement has limitations because it cannot accurately measure the real transient temperature change in the cutting area. In this study, a thin-film thermocouple sensor with high temperature measurement accuracy and rapid response was positioned near the cutting tool tip to prepare a thin-film thermocouple temperature-measurement tool. Its Seebeck coefficient was 48.13 μV/°C, and the highest temperature difference measured between cold and heat regions was 600 °C. The cutting temperature of a TC4 titanium alloy was measured using an infrared thermal imager and the proposed thin-film thermocouple temperature measurement tool in an orthogonal turning test. The test results were analysed to verify the reliability, accuracy, and repeatability of cutting temperature measurements. The cutting length could extend beyond 1500 m.     

TEMPERATURE MEASUREMENT ERROR BY RADIAL INSERTION OF THERMOCOUPLE IN THERMAL CONDUCTIVITY MEASURING DEVICE

To measure the temperature of the inner part of a material, an axially inserted thermocouple is often used. But, when the measurement by an axially inserted thermocouple is difficult, we must insert the thermocouple radially. In the case of radial insertion, a measuring error usually exists. To know the true temperature by the method of radial insertion of a thermocouple, we must conduct numerical calculations.

In this report, numerical calculations have been conducted for the temperature measuring error by radial insertion of thermocouple in a gas thermal conductivity measuring device.^2-5     

TEMPERATURE MEASUREMENT ERROR BY RADIAL INSERTION OF THERMOCOUPLE IN THERMAL CONDUCTIVITY MEASURING DEVICE

To measure the temperature of the inner part of a material, an axially inserted thermocouple is often used. But, when the measurement by an axially inserted thermocouple is difficult, we must insert the thermocouple radially. In the case of radial insertion, a measuring error usually exists. To know the true temperature by the method of radial insertion of a thermocouple, we must conduct numerical calculations.

In this report, numerical calculations have been conducted for the temperature measuring error by radial insertion of thermocouple in a gas thermal conductivity measuring device.^2-5     

铝用高温绝缘涂料的研制

采用元素高分子树脂、特制的铝绝缘搪瓷釉及聚酰亚胺为主要成膜物，制成综合性能优良的铝用高温绝缘涂料，具有较高的耐热性，又保持了良好的电绝缘性和与铝材匹配好等优点。其制备技术路线合理，配制工艺简单，涂料施工方法简便，有一定的推广应用价值。     

磁环境温度测量信号偏差实验研究

由于磁致电阻效应的存在,使得测温器件的信号在磁环境中会产生偏差,而准确的温度测量结果是材料制备或者磁环境下材料特性测量的基础。针对这一问题,对E型铠装热电偶和铠装Pt100铂电阻3种测温元件,在0~5 T磁场环境中,-190~700℃温度范围的测温信号的偏差进行了实验研究。结果显示,2种器件的温度信号的整体趋势是随着磁场强度的上升而升高的,但是随着功率的增加,磁场变化引起的温度偏差逐渐减小,同时,升温速率与不同磁环境温差之间存在二次曲线关系。为今后磁环境下温度信号的校正技术提供了基础的数据支持和理论指导。     

Pyrotechnic reaction of lead monoxide and silicon: measurement of reaction temperature

The measurement of transient high temperatures, from the fast pyrotechnic reaction of lead monoxide and silicon, using an automatic recording pyrometer and optical focussing system is described. The measured temperatures are compared with calculated reaction temperatures with which agreement is good. Practical difficulties are discussed with regard to thermocouple and pyrometer temperature measurements in pyrotechnic systems. Infra-red pyrometers have advantages over thermocouple systems e.g. response time and ability to make non-contact measurements. This work indicates that they can be put to practical use in the field of pyrotechnics.     

高温隔热涂料的保温隔热性能改进探讨

针对超过800℃条件下使用的高温隔热涂料,从涂料的填料入手并利用聚氨酯泡沫塑料作辅助隔热层,使其保温隔热性能得到改进和提高,在一定条件下满足因产品升级而对保温隔热性能提高的要求,通过中空填料的运用和高温隔热涂料+聚氨酯泡沫塑料的复合隔热涂层,提高了耐高温隔热涂料的保温隔热性能,延长保温隔热涂料的有效隔热时间。