超临界循环流化床锅炉技术特点比较

为总结超临界循环流化床(CFB)锅炉技术特点,分析了超临界锅炉参数的选择及循环流化床锅炉比煤粉炉更适合采用超临界参数的原因,详细介绍了国内外超临界CFB锅炉的研究现状.以国内三家锅炉厂针对白马项目提出的超临界600 MW CFB锅炉方案为例,进行分析比较,认为超临界CFB锅炉的设计不存在颠覆性的技术障碍,而且超临界循环流化床燃烧技术将成为我国燃煤电厂重要的洁净煤发电技术,但随着超临界CFB锅炉研发工作的深入,仍有一些问题需进一步研究探讨.     

600MW超临界循环流化床锅炉技术特点

超临界循环流化床（CFB）锅炉兼备了CFB燃烧技术和超临界压力蒸汽循环技术的优点,是一种具有广阔发展前景的洁净煤发电技术,讨论了超临界CFB锅炉设计中的关键问题,诸如水冷壁的选型以及锅炉结构的实现等,在此基础上给出了600MWCFB锅炉的方案,并通过热力计算对运行结果进行预测。     

800MWe超临界循环流化床锅炉概念设计

常压循环流化床 (ACFB)燃烧技术是已经为国际上公认的商业化程度最好的洁净煤技术 ,但在达到较高的供电效率方面并未具有明显的优越性。超临界CFB作为下一代CFB技术 ,综合了超临界蒸汽循环高效率和循环流化床低成本 2方面的优势 ,而循环流化床条件下的热负荷分布规律使得超临界压力下水冷壁的安全性更为可靠 ,脱硫、脱硝投资及运行成本比烟气脱硫和催化还原NOx 低 ,受到人们的高度关注。总结了国内外超临界CFB锅炉研究工作的一些进展 ,详细介绍了 80 0MWe超临界CFB锅炉的概念设计。     

循环流化床锅炉水冷壁的热流密度分布

超临界循环流化床锅炉的一个主要技术关键是炉膛受热面的横向热流分布.在管内工质温度不同、容量不同的3台循环流化床锅炉上,测量了不同高度上膜式水冷壁的金属壁温.将有限元算法用于水冷壁的换热分析,得到了循环流化床锅炉炉膛内烟气向水冷壁的换热系数分布.该结果为超临界CFB锅炉的设计提供了依据.     

600MWe超临界循环流化床锅炉的设计研究

超临界循环流化床锅炉将循环流化床（CFB）燃烧技术与超临界蒸汽压力循环的优点相结合，是一项发展前景十分广阔的洁净煤燃烧技术。该文讨论了超临界大型循环流化床锅炉设计中的诸如炉膛结构。换热面布置等一些重要问题。在此基础上给出了1台600MWe循环流化床锅炉的初步设计方案，最后，通过热力计算，预测了锅炉运行的主要参数并讨论了负荷变化对锅炉各项参数的影响。     

循环流化床锅炉技术的现状及发展前景

简要介绍了国外循环流化床锅炉技术的发展现状，重点讨论了近年来国内循环流化床锅炉技术的研究进展，分析指出了循环流化床锅炉技术的发展趋势。循环流化床锅炉未来将朝着大型化超临界、深度脱硫与脱硝、能源综合利用等方向发展。目前，我国已掌握150MWe及以下各种容量级循环流化床锅炉的设计和制造技术，并通过技术引进开始了300MWe容量级CFB锅炉的生产，未来将大力发展600MWe以上超临界参数锅炉技术。图2表4参16     

大型循环流化床锅炉节能减排关键问题探讨

在分析国内外超临界循环流化床(CFB)锅炉设计与运行情况的基础上,针对近年投运的三十余台超临界CFB锅炉的运行现状,探讨了进一步提高我国660 MW超超临界CFB锅炉节能减排性能应重点研究的若干关键问题,并提出了相关问题的解决方案。     

大型循环流化床锅炉的发展

概述了国内外大型循环流化床锅炉(包括超临界循环流化床锅炉)的发展历程和研究现状,比较了不同流派的技术特点,总结了开发大型循环流化床锅炉过程中的技术要点.指出循环流化床的炉内热流特性使其比煤粉炉更适合与超临界循环进行技术结合,因此循环流化床锅炉的发展趋势是大型化和超临界化.     

关于循环流化床燃烧技术在清洁生产中的前景探讨

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.     

中国循环流化床锅炉的发展:从低压到超临界

回顾了循环流化床锅炉在我国从低压到超临界、从自主开发到引进技术再到二次开发的发展历程,介绍了循环流化床锅炉国外发展情况,总结了发展超临界循环流化床锅炉的技术可行性,分析了发展超临界循环流化床锅炉应注意问题.     

600 MW超临界循环流化床锅炉的设计

介绍了超临界循环流化床锅炉的发展概况、设计的主要问题及国外主要炉型,详细阐述了东方型600MW超临界循环流化床锅炉的主要技术特点、结构和系统布置.表明国内的锅炉制造厂商完全有能力向用户提供先进的大型超临界循环流化床锅炉产品.     

Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler

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.     

超临界循环流化床锅炉的最新进展

循环流化床燃烧技术商业化过程中显示出其优良的环境排放特性,其污染控制成本是目前其它技术无法比拟的,但在达到较高的供电效率方面并未具有明显的优越性,因此提高蒸汽的压力和温度到超临界并增加其容量已成广泛的共识。原则上,循环流化床燃烧技术及超临界蒸汽循环均是成熟技术,二者的结合相对技术风险不大,结合后的技术综合了循环流化床低成本污染控制及高供电效率2个优势,在燃料价格、材料成本、制造水平上,具有明显优越。随着循环流化床大型化的发展,20世纪末展开了超临界循环流化床的研究,介绍了目前国际上的最新进展。     

The impact of bed temperature on heat transfer characteristic between fluidized bed and vertical rifled tubes

In the present work, the heat transfer study focuses on assessment of the impact of bed temperature on the local heat transfer characteristic between a fluidized bed and vertical rifled tubes (38mm-O.D.) in a commercial circulating fluidized bed (CFB) boiler. Heat transfer behavior in a 1296t/h supercritical CFB furnace has been analyzed for Geldart B particle with Sauter mean diameter of 0.219 and 0.246mm. The heat transfer experiments were conducted for the active heat transfer surface in the form of membrane tube with a longitudinal fin at the tube crest under the normal operating conditions of CFB boiler. A heat transfer analysis of CFB boiler with detailed consideration of the bed-to-wall heat transfer coefficient and the contribution of heat transfer mechanisms inside furnace chamber were investigated using mechanistic heat transfer model based on cluster renewal approach. The predicted values of heat transfer coefficient are compared with empirical correlation for CFB units in large-scale.     

Heat flux distribution on circulating fluidized bed boiler water wall

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.     

200MW循环流化床锅炉燃烧优化调整试验研究

介绍了200MW循环流化床锅炉的冷态试验和燃烧优化调整试验,分析了各因素对循环流化床锅炉运行的影响,提出了适用于200MW循环流化床的参数要求,研究工作为提高循环流化床锅炉运行效率和节能减排积累了宝贵经验。     

循环流化床锅炉的优点和技术发展方向

介绍流化床技术发展概况,循环流化床锅炉在燃烧、环保、调控、投运费用等方面的优点,对循环流化床锅炉有关技术的发展,提出了建议和预测。