烧嘴参数对耐火砖热变形的影响分析

发布时间：2018-04-19 06:08

本文选题：烧嘴耐火砖 + 热流固耦合　；参考：《热科学与技术》2017年03期

【摘要】：热变形是引起耐火砖脱落的重要因素之一,烧嘴参数对热变形的影响很大。针对烧结套筒式双旋流烧嘴的结构特点,采用热流固耦合方法建立了烧嘴的有限元模型,首先利用FLUENT分析了温度场和流场,结合测量数据验证了模型的正确性;然后对耐火砖通道进行热结构分析,获得了通道的热变形分布;最后采用响应面方法设计了81组试验进行模拟计算,获得了烧嘴结构参数和操作参数对耐火砖通道表面温度和热应变的影响规律。结果表明:燃烧器负荷增加、外侧空气预热温度增加会显著地增加耐火砖的热变形,比如燃烧器负荷增加1%,耐火砖应变增加0.75%;增加外侧空气流速、增加内侧空气预热温度有助于缓解耐火砖的热变形,比如外侧空气流速增加1.0%,耐火砖应变减少0.30%;增加外侧空气旋流片角度既有助于强化混合燃烧,又能降低耐火砖的热变形量。
[Abstract]:Thermal deformation is one of the important factors that cause the fire brick to fall off, and the parameters of the burner have great influence on the thermal deformation.According to the structural characteristics of the sinter sleeve double swirl burner, the finite element model of the burner is established by using the thermal-fluid-solid coupling method. Firstly, the temperature field and the flow field are analyzed by FLUENT, and the correctness of the model is verified by combining the measurement data.Then the thermal structure of the refractory brick tunnel is analyzed and the thermal deformation distribution of the channel is obtained. Finally, 81 groups of tests are designed by using response surface method for simulation calculation.The influence of structure parameters and operation parameters on surface temperature and thermal strain of refractory brick channel is obtained.The results show that the thermal deformation of refractory brick will be significantly increased with the increase of burners load and the preheating temperature of the outside air. For example, the burners load increases by 1, the firebrick strain increases by 0.75, and the lateral air velocity increases.Increasing the preheating temperature of the inner air helps to alleviate the hot deformation of the refractory brick, for example, the outside air velocity increases by 1.0 and the strain of the refractory brick decreases by 0.30.The increase of the angle of the outer air swirl sheet can not only help to strengthen the mixed combustion, but also reduce the thermal deformation of the refractory brick.
【作者单位】：安徽工业大学能源与环境学院;安徽诚铭热能技术有限公司;
【分类号】：TQ175.7

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