循环流化床锅炉散热损失数值模拟及实验研究

发布时间：2018-01-23 01:52

  本文关键词： 循环流化床 锅炉 散热损失 数值模拟 热态实验台　出处：《哈尔滨理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：循环流化床锅炉散热损失的实质是由保温层性能的好坏以及保温结构的合理性所决定。所以本文以某现运行电厂的220t/h循环流化床锅炉作为研究对象,通过对保温材料、保温结构、外壁面温度的模拟分析及实验研究,获得炉墙传热及保温性能规律。探讨炉墙在保温材料及保温结构变化时对散热损失的影响,给出了多种材料及保温结构的经济厚度。首先,建立了循环流化床锅炉各部分的物理模型及数学模型,然后利用Comsol软件对多种保温材料及保温结构的传热过程进行数值模拟,计算得出炉墙传热过程的温度分布规律、外壁面温度分布特点及其相应的经济厚度。通过对模拟结果的分析可知,不同保温材料及保温结构在同一工况下的经济厚度并不相同;保温材料厚度相同时承受的温度也不同,而这些模拟结论为工程实践提供了理论依据。其次,本文在数值模拟的基础上,针对研究内容设计并搭建了循环流化床炉墙传热热态实验台。通过对多种保温材料及保温结构的保温性能测试,得出炉墙外壁面温度分布规律、外壁面温度及保温材料的保温性能曲线。通过对其厚度上的调节使外壁面温度符合标准值,进而使散热损失达到最小。最后,结合实验测试结果对部分模拟方案进行验证同时分析两者产生差异的原因。综合数值模拟结果与实验结果得出炉膛部分,硅酸铝纤维毡与岩棉的经济厚度为110mm;酚醛矿渣棉与复合材料的经济厚度为130mm;旋风分离器部分,硅酸铝耐火纤维毡的经济厚度为57mm,硅酸铝纤维毯的经济厚度为155mm,水泥膨胀蛭石板块的经济厚度为58mm;尾部烟道部分:两种设计方案中所能承受的最高平均温度分别为396℃、386℃。所以针对炉型找到保温材料的经济厚度可以使循环流化床锅炉散热损失降低,同时节约运行成本及施工成本,为工程实践提供参考。
[Abstract]:The essence of heat loss of circulating fluidized bed boiler is decided by the performance of insulation layer and the reasonableness of insulation structure. So this paper takes 220 t / h circulating fluidized bed boiler in a power plant as the research object. The heat transfer and heat preservation performance of the furnace wall are obtained through the simulation analysis and experimental study on the heat preservation material, the insulation structure and the external wall temperature, and the influence of the furnace wall on the heat dissipation loss when the heat preservation material and structure change are discussed. The economic thickness of various materials and insulation structures is given. Firstly, the physical and mathematical models of each part of CFB boiler are established. Then the heat transfer process of various insulating materials and structures is simulated by Comsol software, and the temperature distribution of the furnace wall heat transfer process is calculated. Through the analysis of the simulation results, it can be seen that the economic thickness of different insulating materials and structures is different under the same working condition. The same thickness of insulation materials bear different temperatures, and these simulation conclusions provide a theoretical basis for engineering practice. Secondly, this paper is based on the numerical simulation. According to the research content design and build the circulating fluidized bed furnace wall heat transfer and hot state test platform. Through a variety of thermal insulation materials and insulation structure thermal insulation performance test obtained out of the wall wall temperature distribution. Through the adjustment of the thickness of the external wall temperature in line with the standard value, and then make the heat loss to the minimum. Finally. Combined with the experimental results to verify part of the simulation scheme and analyze the reasons for the difference between the two. Combined with the results of numerical simulation and experimental results to get the furnace part. The economic thickness of aluminum silicate fiber felt and rock wool is 110 mm; The economic thickness of phenolic slag cotton and composite material is 130 mm. In the cyclone separator, the economic thickness of aluminum silicate refractory fiber felt is 57 mm, the economic thickness of aluminum silicate fiber blanket is 155 mm, and the economic thickness of cement expansion vermiculite plate is 58 mm; Tail flue: the maximum average temperature of the two designs is 396 鈩，

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