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本文分析了循环流化床锅炉循环倍率与燃烧及炉内传热工况的密切关系,对返料器的设计作了一定的分析;并阐明了循环倍率与锅炉低负荷运行及炉内真空度沿高度变化的关系。 相似文献
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本文介绍了循环倍率的几种定义,循环倍率与分离器效率的关系,飞灰份额、飞灰浓度的计算,密相区热平衡以及循环倍率对CFBB燃烧效率的影响。 相似文献
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论循环流化床锅炉的循环倍率 总被引:3,自引:1,他引:2
循环倍率是循环流化床(CFB)锅炉循环系统的基本特征值,是分析和设计循环流化床循环系统的前提。文章阐述循环流化床锅炉循环倍率的概念、循环倍率关系式的推导、分析及其应用。介绍作者提出的CFB锅炉循环系统的物理模型及由此导得的以给煤为基准的R循环倍率关系式及以随煤进入循环系统的固体质量为标准的K循环倍率关系式,并作进一步分析。将K循环倍率关系式与近年来普遍应用的Kj=η/(1-η)简化关系式作比较呈现出K关系式的正确性。循环倍率关系式(R或K)从理论上揭示CFB锅炉循环物料量建立和维持的基本规律,为分析循环系统奠定了理论基础,对循环系统的设计、运行有重大指导意义。 相似文献
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通过对循环流化床锅炉循环倍率的分析与计算,提出一种简单、实用、操作性能好,具有较强指导意义的工程模,以确定最优设计及运行环倍率,从而为循环流化床锅炉的设计及运行提供重要依据。 相似文献
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文章基于循环流化床的传热特点,应用“分级筛分”和“分级循环倍率”的概念,分析了宽筛分不同粒径颗粒对传热的影响。分别针对密相区,稀相区以及对流受热面的传热进行探讨,对宽筛分循环流化床锅炉的设计和运行有参考价值。 相似文献
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循环流化床技术是一种低污染的燃烧方式,同时其低负荷性能具有较好的经济效益,利用该技术用来改造江西125MW机组煤粉在经济和技术上是合理可行的。 相似文献
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介绍了应用低倍率循环流化床燃烧技术改造l台链条炉及3台沸腾炉的情况,并取得了良好的经济效益,1年回收单台炉改造的投资成本。 相似文献
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Cheng Leming Wang Qinhui Shi Zhenglun Luo Zhongyang Ni Mingjiang Cen Kefa 《Frontiers of Energy and Power Engineering in China》2007,1(4):477-482
Heat transfer of a furnace in a large-scale circulating fluidized bed (CFB) boiler was studied based on the analysis of available
heat transfer coefficient data from typical industrial CFB boilers and measured data from a 12 MWe, a 50 MWe and a 135 MWe CFB boiler. The heat transfer of heat exchanger surfaces in a furnace, in a steam/water cooled cyclone, in an external heat
exchanger and in the backpass was also reviewed. Empirical correlation of heat transfer coefficient was suggested after calculating
the two key parameters, solids suspension density and furnace temperature. The correlation approach agrees well with the data
from the large-scale CFB boilers.
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Translated from Journal of Power Engineering, 2006, 26(3): 305–310 (in Chinese) [译自: 动力工程] 相似文献
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A study of the heat transfer about the heating surface of three commercial 300 MWe CFB boilers was conducted in this work. The heat transfer coefficients of the platen heating surface, the external heat exchanger (EHE) and cyclone separator were calculated according to the relative operation data at different boiler loads. Moreover, the heat transfer coefficient of the waterwall was calculated by heat balance of the hot circuit of the CFB boiler. With the boiler capacity increasing, the heat transfer coefficients of these heating surface increases, and the heat transfer coefficient of the water wall is higher than that of the platen heating surface. The heat transfer coefficient of the EHE is the highest in high boiler load, the heat transfer coefficient of the cyclone separator is the lowest. Because the fired coal is different from the design coal in No.1 boiler, the ash content of the fired coal is much lower than that of the design coal. The heat transfer coefficients which calculated with the operation data are lower than the previous design value and that is the reason why the bed temperature is rather high during the boiler operation in No.1 boiler. 相似文献
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循环流化床锅炉在雨季中普遍出现给煤不畅、堵塞的问题,文中主要探讨给煤装置的优化设计、正确选用和正确运行的方案。 相似文献
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文中指出了大中型循环流化床锅炉采用屏式过热器的必要性,概述了屏式过热器的布置方式,提出了设计质量流速的合理范围以及壁温计算应遵循的原则,总结了屏式过热器在结构设计中防磨、热膨胀、穿墙密封等方面的经验。 相似文献
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某电厂260t/h CFB锅炉运行问题与对策 总被引:1,自引:1,他引:0
针对华美热电公司国产2台260t/h循环流化床(CFB)锅炉运行中暴露一次风机选型过大、给煤系统堵煤、冷渣器排渣运行不稳定等问题,进行详细分析,并提出相关问题的处理方案和改进措施。 相似文献
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本文就循环流化床锅炉的组成、工作原理、特点、发展应用及存在问题作了详细阐述,并对循环流化床锅炉的发展前景作了瞻望。 相似文献