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绪言近年来,由于超临界压力锅炉和核反应堆的发展,以及火箭发动机和燃气轮机叶片冷却的需要,所以对于近临界压力流体的传热问题有所研究。特别是由于对超临界压力锅炉需求的增加,要求能在很广泛的运行参数范围内连续地准确计算水和蒸汽的传热系数。在研究超临界压力传热的试验中,许多 相似文献
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火电厂超临界和超超临界机组指的是锅炉内工质的压力。锅炉内的工质都是水,水的临界压力是22.115MPa,温度为347.15℃。在这个压力和温度时,水和蒸汽的密度是相同的,这就叫水的临界点,炉内工质压力低于这个压力就叫亚临界锅炉,大于这个压力就是超临界锅炉,炉内蒸汽温度不低于593℃或蒸汽压力不低于31MPa则称为超超临界。 相似文献
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1974年6月,玉岛电站3号机组投入运行,该机组系配50万瓩的超临界压力UP 锅炉。锅炉设计规范:锅炉型式超临界压力再热UP 锅炉蒸发量1710吨/时蒸汽压力255公斤/厘米~2蒸汽温度543/541℃燃烧方式前后墙对冲燃烧燃料重油、原油、轻油单烧和混烧本锅炉的设计是基于超临界压力锅炉的许多实际经验,因此,具有高度的可靠性和良好的效率。同时还投入了预防公害的最新技术和设备。此外尚采用了计算机控制,确保安全运行,操作方便。万一供电系统发生事故时,本机组可以解列单独供电运行。锅炉设计时注意事项:这台超临界压力锅炉的设计吸取了日立公司生产的7台已投入运行的和1台正在建造的锅炉的经验和取得的成绩,并且电力公 相似文献
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前言通常,大型超临界压力直流锅炉是用来作为基本负荷机组的。石川岛播磨重工业公司所提供的多台这种超临界压力直流锅炉已投入正常运行。对日本来说,预计未来将用大容量原子能发电作为基本负荷,这样就要求超临界压力直流锅炉不再用作基本负荷,而需具有负荷调节机能,也就是要具有作为中间负荷火力发电的机能。为适应这样的要求,福斯特·惠勒公司在超临界直流锅炉上使用了一种“高压分离器启动方式”,现在已在美国投入 相似文献
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旋转式压力能交换器能量回收试验研究 总被引:1,自引:0,他引:1
旋转式压力交换器是利用正位移原理工作的流体能量回收装置。介绍了设计的流体自驱型旋转式压力能交换器.应用在SWRO系统中,进行了实际工况条件下的能量回收试验、端面密封性能试验和流体掺混试验。除流体掺混试验用1.8%和3.5%浓度的NaCl溶液做试验介质外,其余试验均用自来水做试验介质。试验结果表明,压力能交换器内部端面密封性能对压力水平有关键影响,在现有装置条件下,转子转速超过1000r/min,高压端进流压力1.25MPa,能量回收效率达到76%,流体掺混率低于5%。 相似文献
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Michele Messina 《Renewable & Sustainable Energy Reviews》2012,16(5):2980-2987
This work deals with an experimental procedure to validate theoretical equations used for pressure losses inside anemometer testing equipment. This equipment allows for the generation of air flow inside a chamber designed for anemometer calibration testing at different air speeds. To calibrate anemometers to high accuracy, the air flow must have very low turbulence and uniform velocities over the testing chamber cross section. For high performance, the anemometer testing equipment used a closed-circuit wind tunnel design.In designing the anemometer testing equipment, the pressure losses of single components were evaluated as well as overall pressure loss utilizing theoretical equations found in the scientific literature. Once the pressure losses were evaluated, the fan was chosen to ensure volumetric flow, balance pressure losses and above all maximise its performance.With the design completed, the anemometer testing equipment was built, and a campaign of experimental measurements was performed to evaluate the accuracy of the theoretical pressure loss equations. The campaign was performed in two different conditions: closed testing chamber and open testing chamber. The results showed good agreement between the theoretical and experimental pressure losses for the closed testing chamber. Conversely, a discrepancy was revealed for the open condition. The origin of this discrepancy was investigated and a new equation proposed. 相似文献
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Since 1960 the Department of Mechanical and Industrial Engineering of the Queen's University of Belfast has been actively engaged in many research and development projects related to high pressure technology, including detailed experimental studies of the fatigue, fracture and elevated temperature creep behaviour of thick-walled high pressure components. In addition, a considerable amount of equipment for pressures up to 2 GPa has been designed and developed. During the course of this work many mistakes have been made and many premature and potentially dangerous failures have occurred. This paper sets on record some of these events in the hope that they may be of guidance to designers entering the field of high pressure and also with the broader aim of encouraging a more open discussion of high pressure equipment failures and high pressure safety. 相似文献