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为了对电站锅炉声学测温中的声源进行选择,借助冷态实验台对扫频信号进行了试验研究,并在国内某300 MW锅炉上进行了热态试验.为了确保其准确性,同时利用热电偶进行了热态温度标定.结果表明:线性扫频信号适合作为电站锅炉声学测温中的声源信号;500~3 000 Hz频率段的扫频信号作为声源最为适宜;扫频信号的频率区间越小,互相关时延估计效果越差;扫频周期取0.1 s最为合适;线性扫频信号成功地在300 MW锅炉声学测温系统中得以应用,可为电厂锅炉声学测温的研究提供重要的参考. 相似文献
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以理论和试验相结合的方法,对锅炉热态时水冷壁附近的温度场及声线分布进行了研究,开发了基于声学测温的水冷壁局部超温监测系统,并在国内某300MW锅炉机组上进行了试验研究.结果表明:声学测温技术应用于水冷壁局部超温监测是完全可行的;锅炉热态时,水冷壁附近的声线会朝着炉膛内高温侧发生弯曲;系统测得的烟气温度作为基准量能很好地反映水冷壁向火侧壁面温度的变化情况;线性扫频信号可以作为监测系统的声源信号,扫频区间在500~3 000Hz为宜;此系统中,互相关时延估计法能准确地计算出声波飞渡时间. 相似文献
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Winter Turf Growing Season Elongation Characteristics of a Thermosyphon Unit that Uses a Shallow Geothermal Source 下载免费PDF全文
Low temperature stress is an important factor for turf growth in the northern high‐latitude environment. A thermosyphon temperature controlling unit with a shallow geothermal source was proposed by analyzing present techniques to prolong the turf growing season in winter. Thermosyphon unit prototypes were developed and tested in a water park. The relations between ambient temperature, depth, material, structure, underground temperature, and root temperature were studied experimentally. The thermosyphon unit performance was analyzed. Results indicate that underground and root temperatures remain almost constant with an hourly ambient temperature. The root temperature remains steady due to the thermosyphon unit application. The underground temperature increases with the depth increase, and the increment is at most 1 °C. The root temperature of a copper thermosyphon unit is higher than that of a steel thermosyphon unit, and the temperature difference can reach 2 °C. The root temperature of a type I thermosyphon unit is higher than that of a type II, and the temperature increase is less than 1 °C. The root temperature variation due to the thermosyphon material is smaller with the increase in depth. 相似文献
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综述了热风炉提高风温的主要途径:采用空煤气预热和高效能陶瓷燃烧器技术提高理论燃烧温度和拱顶温度;增大单位体积格砖的换热面积和采用均匀配气技术加强蓄热室内的热交换;同时在热风炉的不同部位选用不同材质的耐火材料,实现良好的保温效果;在此基础上适当缩短送风周期时间,并采用合理的操作制度。适当评价了各种技术对提高风温的效果。 相似文献
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Peter Sobotka 《国际能源研究杂志》1994,18(3):401-420
The aim of the paper is to create a new climatic model suitable for an energy balance analysis of the below-grade part of a building in a country with diverse topography, Slovakia, serving as an example. Slovakia is the eastern part of the former Czechoslovakia with a population and area similar to that of Denmark. Constants in the final relations — the mean annual temperature on the ground susrface To2, the mean annual temperature in 1 m and/or 2 m depth T12, the average year temperature amplitude on the surface AY, and the day of occurrence of the minimal temperature to — were introduced on the basis of the statistical evaluation of the long-term temperature measurements of the Hydreometeorological Institute on 49 sites in Slovakia. The discussion of recommended values is given together with information on air and underground water temperatures. Through statistical analysis it was possible to quantify dependence of the To2, T12 and AY, on elevation which was found to be the most important parameter for the climatic model of the country. The weighted average of the minimum daily temperatures from all the years recorded at 49 meteorological stations was determined as the day when minimum surface temperature occur in Slovakia. It was found to be in agreement with the results of long-lasting measuring of air temperature. 相似文献
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通过模拟优化计算,制作出4种聚光反射器,并进行了真空管空晒测试.把空晒温度及其变化趋势与当天太阳辐射条件的模拟结果进行了比较,新设计的几种非跟踪聚光反射器的集热效果都颇为理想,可应用于低温蒸汽发电、制冷空调和海水淡化等. 相似文献
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温度参数是电力系统运行状态中需要监控的重要物理量之一,光纤温度传感相较于其他温度传感技术,具有耐腐蚀、抗电磁干扰、低能耗、无源、易部署等诸多优势.文章分析了基于光纤的多种温度测量和传感技术原理、发展及其各自适用的应用场景,讨论了光纤测温技术在电力系统的工程使用情况,得出不同光纤测温技术的应用优势,并展望了光纤测温技术在... 相似文献
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主要介绍用于粉末冶金行业的钨钼产品烧结工艺过程的中频感应烧结炉的温度自动测量和自动控制的应用技术,并对炉温的径向和轴向的均匀性进行了测试和分析。 相似文献