240th循环流化床锅炉结构分析报告与热力计算.pdf

摘 要 循环流化床燃烧技术是 20 世纪 80 年代在锅炉上得以成功应用的一种清洁煤燃烧 技术。由于它有高效、低污染、煤种适应性强等特点，在很多国家都得到了重视。我 国自从上个世纪开始发展它，目前这种技术已相当成熟。 本文主要针对 240T/H 循环流化床锅炉的设计过程进行阐述。 本设计中先进行了无 脱硫工况及脱硫工况的燃料消耗量跟烟气量计算，随后进行了脱硫计算、热力计算、 结构计算和烟气阻力计算等，在热力计算中，利用相似原理，采用逐步逼近的方法， 进行迭代计算，确定了炉膛，汽冷旋风分离器和回料器的尺寸。循环流化床锅炉燃用 的是烟煤，挥发性较高，故炉膛里采用前后墙对冲燃烧。炉膛底部使用水冷布风板， 用以支持静态床料和保证气流的分布均匀。 2 本次设计的锅炉 额定蒸发量 240t/h ，炉膛截面积 52.878m 。从计算结果得知， 该锅炉的设计合理，效率较高，可以供工程实际参考。本论文附锅炉本体图，炉膛水 冷配风装置结构图，生产工艺流程图各一。 关键词 : 循环流化床锅炉 脱硫 热力计算 结构分析 Abstract The circulating fluidized bed (CFB) burning technology is a kind of clean coal burning technology which started from 1980s.For its high efficient, the low pollution and strong suitability for many coals ，many countries have paid attention to the development of CFBB. Our country started the study of CFBB since 1980’s .Now, the technology is mature. This essay elaborates the design process of 240T/H circulating fluidized bed boiler. In this design,I made a calculation of the without desulfurization condition, the status of desulfurization of fuel consumption and combustion flue gas.Then, I carried out the desulfurization calculation, thermodynamic calculation, strength calculation, the smoke and wind resistance calculation. In the thermodynamic calculation, It should be emphasized that similarity criterion and successive approximation method with iterative computing are used in determine the size of furnace, steam cold cyclone, recycling collector.As the boiler combusts bituminous coal,I choose swirl burners laying distribution board which can support the solid fuel and ensure the uniform airflow.