共查询到19条相似文献,搜索用时 140 毫秒
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为研究超临界循环流化床锅炉水冷壁的变形问题,在实炉测量某600 MW超临界循环流化床锅炉炉膛水冷壁壁温分布的基础上,采用数值模拟方法对距离布风板30m高度处4.6m×2m区域的水冷壁管进行了热应力分析。结果表明:80%负荷工况下,距离布风板30m高度处区域的水冷壁管沿炉膛高度方向的温度变化率较大,热应力分布极不均匀;计算区域的水冷壁管整体向下膨胀,由于存在膨胀偏差,水冷壁向火侧向炉内凸起变形,最大变形量约1.14mm;对于整个水冷壁管屏而言,存在的变形量叠加会加剧水冷壁磨损,甚至造成爆管事故。 相似文献
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循环流化床锅炉炉膛水冷壁管的磨损一直是导致泄露、爆管等运行事故的主要原因之一。本文从最基本的磨损机理出发,详细分析了造成循环流化床炉膛不同部位水冷壁管磨损的原因,并提出了相应的预防措施及改造建议以供参考。 相似文献
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以某台1 000MW超超临界塔式锅炉作为研究对象,采用区域法建立了二维小区换热模型,简化了炉内辐射换热与对流换热,对不同锅炉负荷下对流换热量占炉膛高度方向各分区换热量、炉膛总换热量的比例以及沿炉膛宽度方向水冷壁壁温的分布进行了研究,并与实测数据进行了比较.结果表明:水冷壁壁温计算值与试验值的最大偏差率为5.26%,均呈现中间高、两端低的分布趋势;对流换热量最多可使壁温计算值提高16.7K,计算精度提高3.30%;计算所得的水冷壁壁温最高值为523.5℃,未超出材料的允许温度,且有4.8%的安全裕度. 相似文献
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在超临界"W"火焰锅炉水冷壁上设计安装了监测管内外壁温及管内工质温度的测量装置,得到了优化内螺纹垂直水冷壁管壁温、管内工质温度及典型负荷下炉膛截面热负荷分布等实炉运行数据。试验及研究结果表明:在机组由亚临界到超临界的转换过程中,管水冷壁管内外壁温与管内工质温度呈现剧烈变化状态,在超临界负荷下,内壁与工质的换热明显减弱,水冷壁的安全性受到威胁;管内外壁温差及内壁与工质温差沿炉膛宽度和深度方向均呈现中间高两侧低的分布,水冷壁向火侧管外壁温度大大低于设计值,水冷壁有较大的安全裕量,实际炉膛截面热负荷分布介于两种设计热负荷值之间。 相似文献
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对2台1 000MW超超临界压力塔式直流锅炉炉膛水冷壁管壁温度和热负荷分布进行了测量和计算,并对不同负荷工况、不同磨煤机投运方式下的热负荷和管壁温度分布规律以及炉膛上部垂直水冷壁的热负荷分布进行了分析.结果表明:1 000MW塔式直流锅炉炉膛热负荷的分布规律与其他四角切圆燃烧锅炉炉膛热负荷的分布规律基本一致.由于在最上层的燃烧器上方布置了燃尽风,对炉内烟气的扰动加强,导致沿管长方向的热负荷在54m标高处波动较大;在燃尽风喷嘴中心线以上,因受到燃尽风进入炉膛的影响,水冷壁热负荷大幅度下降.为了避免炉膛大比热区传热恶化,可以将处于拟临界点附近的水冷壁布置在低热负荷区域. 相似文献
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LU Junfu YUE Guangxi YANG Hairui ZHANG Jiansheng YU Long ZHANG Man YANG Zhongming 《Frontiers in Energy》2008,2(2):134
The future of circulating fluidized bed (CFB) combustion technology is in raising the steam parameters to supercritical levels. Understanding the heat flux distribution on the water wall is one of the most important issues in the design and operation of supercritical pressure CFB boilers. In the present paper, the finite element analysis (FEA) method is adopted to predict the heat transfer coefficient as well as the heat flux of the membrane wall and the results are validated by direct measurement of the temperature around the tube. Studies on the horizontal heat flux distribution were conducted in three CFB boilers with different furnace size, tube dimension and water temperature. The results are useful in supercritical pressure CFB boiler design. 相似文献
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Junfu Lu Long Yu Guangxi Yue Hairui Yang Jiansheng Zhang Man Zhang Zhongming Yang 《Frontiers of Energy and Power Engineering in China》2008,2(2):134-139
The future of circulating fluidized bed (CFB) combustion technology is in raising the steam parameters to supercritical levels.
Understanding the heat flux distribution on the water wall is one of the most important issues in the design and operation
of supercritical pressure CFB boilers. In the present paper, the finite element analysis (FEA) method is adopted to predict
the heat transfer coefficient as well as the heat flux of the membrane wall and the results are validated by direct measurement
of the temperature around the tube. Studies on the horizontal heat flux distribution were conducted in three CFB boilers with
different furnace size, tube dimension and water temperature. The results are useful in supercritical pressure CFB boiler
design.
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Translated from Journal of Power Engineering, 2007, 27(3): 336–340 [译自: 动力工程] 相似文献
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对循环流化床锅炉内水冷壁的传热机理进行了分析,验证了循环流化床炉内受热面的传热计算经验公式,可供设计、调试和运行时参考。 相似文献
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本文介绍了循环流化床(CFB)燃烧技术、CFB锅炉的特点及中小容量CFB锅炉的作用,讨论了CFB燃烧技术在清洁生产中的发展前景. 相似文献
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Junfu LYU Hairui YANG Wen LING Li NIE Guangxi YUE Ruixin LI Ying CHEN Shilong WANG 《Frontiers in Energy》2019,13(1):114
The supercritical circulating fluidized bed (CFB) boiler, which combines the advantages of CFB combustion with low cost emission control and supercritical steam cycle with high efficiency of coal energy, is believed to be the future of CFB combustion technology. It is also of greatest importance for low rank coal utilization in China. Different from the supercritical pulverized coal boiler that has been developed more than 50 years, the supercritical CFB boiler is still a new one which requires further investigation. Without any precedentor engineering reference, Chinese researchers have conducted fundamental research, development, design of the supercritical CFB boilers independently. The design theory and key technology for supercritical CFB boiler were proposed. Key components and novel structures were invented. The first 600 MWe supercritical CFB boiler and its auxiliaries were successfully developed and demonstrated in Baima Power Plant, Shenhua Group as well as the simulator, control technology, installation technology, commissioning technology, system integration and operation technology. Compared with the 460 MWe supercritical CFB in Poland, developed in the same period and the only other supercritical one of commercial running in the word beside Baima, the 600 MWe one in Baima has a better performance. Besides, supercritical CFB boilers of 350 MWe have been developed and widely commercialized in China. In this paper, the updated progress of 660 MWe ultra-supercritical CFB boilers under development is introduced. 相似文献