作者：李长宏1,2, 黄贞益1
作者单位：1. 安徽工业大学, 安徽 马鞍山 243002;
2. 南京工业大学机械与动力工程学院, 江苏 南京 211800
关键词：热防护;高温测试系统;黑匣子;加热炉
摘要：
为解决目前小出入口加热炉坯料温度测试困难的问题，对黑匣子高温测试系统的热防护进行深入研究。为达到由外到内形成温度梯度，外部能够承受高温冲、内部温度恒定和减小系统尺寸的目的，首次将热防护由外到内设计为高温绝热层、低温绝热层和吸热层。高温绝热层主要用来抵抗外部高温，保护低温绝热层不受高温冲击。低温绝热层导热系数低，用来阻止热量传入。吸热层由相变材料组成，吸收传入热量，保持内部温度恒定。建立热防护3层结构的传吸热数学模型，对各部分尺寸及可靠性进行计算分析。通过破坏性实验和现场测试实验表明：采用该方案设计的热防护尺寸小，性能稳定，能够为小出入口加热炉坯料温度提供安全可靠的测试服务。
Research on thermal protection of small size black box hi-temp meter
LI Changhong1,2, HUANG Zhenyi1
1. Anhui University of Technology, Maanshan 243002, China;
2. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211800, China
Abstract: To solve the problem that the billet temperature can hardly be measured for heating furnace with small inlet and outlet, the thermal protection of black box hi-temp meter is thoroughly researched in this paper. In order to form a temperature gradient from outside to inside, withstand high temperature shock externally, keep the internal temperature constant and downsize the system, the thermal protection is designed into hi-temp insulation layer, low-temp insulation layer and heat absorbing layer from outside to inside for the first time. The hi-temp insulation layer is mainly used to resist outside high temperature to protect the low-temp insulation layer. The low-temp insulation layer, with low thermal conductivity, mainly prevents heat transfer-in. The heat absorbing layer is made from phase change material and it absorbs heat transferred from outside and keeps the internal temperature constant. A mathematical heat transfer and absorption model with three-layer thermal protection structure is established to calculate and analyze the size and reliability at different parts. Destructive test and field test show that this design method can effectively decrease the size of thermal protection and ensure its stable performance. The thermal protection can provide safe and reliable temperature measuring services for billets of heating furnace with small-size inlet and outlet.
Keywords: thermal protection;hi-temp meter;black box;heating furnace
2017, 43(5): 86-90 收稿日期: 2016-09-10;收到修改稿日期: 2016-11-07
基金项目:
作者简介: 李长宏(1974-),男,山东汶上县人,讲师,研究方向为测试技术、故障诊断及控制技术。
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