蝶阀系统温度场及其结构研究

发布时间：2018-01-02 09:05

本文关键词：蝶阀系统温度场及其结构研究　出处：《武汉科技大学》2012年硕士论文　论文类型：学位论文

【摘要】：钢铁行业是国民经济中的重要支柱，为各类基础建设提供必不可少的材料。由于目前经济发展步伐放缓，国家提出目前的主要工作是节能减排、降低能耗和转变企业的经济结构形式。蝶阀系统控制着加热炉的温度，然而蝶阀及执行机构因温度过高，导致蝶阀系统控制精度变低，造成加热炉温度指标不稳定、产品达标率下降和设备故障率较高。因此，本文提出对蝶阀系统热传递机理进行研究，提出合理的蝶阀系统的温度控制措施。通过蝶阀系统的三维建模与仿真分析，验证了该措施的可行性。并于现场实施，统计现场改造后蝶阀及执行机构的温度与故障率，说明了蝶阀系统温度控制措施的有效性。首先，指出某厂热轧加热炉热空气管道处的蝶阀及执行机构的温度过高现象以及后果，着重分析了影响蝶阀系统温度的四种直接因素，并提出相对应的温度控制措施。根据该措施，对蝶阀及执行机构建立相应CAD/CAE三维仿真耦合模型。然后，在Fluent软件中利用顺序耦合方法，计算了蝶阀及执行机构与空气耦合模型的温度场，对比之前温度值，发现蝶阀系统的温度控制措施能起到明显的降温效果。并在ANSYS中运用间接法，计算蝶阀及执行机构热应力，结果显示该措施下蝶阀及执行机构的热应力均小于许用应力。还在Fluent中利用流体力学方法，仿真出管道内部流场的分布，证明该措施不影响管道内空气流动特性。最后，在现场进行蝶阀及执行机构的改造工作。对改造后的蝶阀及执行机构进行温度测量和故障率统计，证明该措施能很好满足于实际生产。本文提出蝶阀系统的温度控制三个措施，，并通过有限元软件验证蝶阀系统温度控制措施的实用性和可靠性。在生产中，蝶阀系统的温度控制措施的实施，降低了蝶阀及执行机构的温度，降低了蝶阀系统的故障率，提高了热轧加热炉产品质量。
[Abstract]:Iron and steel industry is an important pillar of the national economy, providing essential materials for all kinds of infrastructure. Because the pace of economic development is slowing, the state proposes that the main work is energy conservation and emission reduction. Reduce energy consumption and change the economic structure of the enterprise. Butterfly valve system controls the temperature of heating furnace. However, the butterfly valve and actuator control precision is lower because of the high temperature. The temperature index of reheating furnace is unstable, the product reaches the standard rate and the equipment failure rate is high. Therefore, the mechanism of heat transfer of butterfly valve system is studied in this paper. The reasonable temperature control measures of butterfly valve system are put forward. The feasibility of the measure is verified by the 3D modeling and simulation analysis of the butterfly valve system. The temperature and failure rate of the butterfly valve and its actuators were analyzed, and the effectiveness of the temperature control measures of the butterfly valve system was explained. First of all, it points out the phenomenon and consequence of the excessive temperature of butterfly valve and actuators in the hot air pipeline of a hot rolling furnace in a certain plant, and emphatically analyzes four direct factors that affect the temperature of butterfly valve system. The corresponding temperature control measures are put forward. According to this measure, the corresponding CAD/CAE three-dimensional simulation coupling model is established for butterfly valves and actuators. Then, the temperature field of the butterfly valve, actuator and air coupling model is calculated by using the sequential coupling method in Fluent software, and the temperature values before the model are compared. It is found that the temperature control measures of the butterfly valve system can significantly reduce the temperature, and the thermal stress of the butterfly valve and its actuator is calculated by indirect method in ANSYS. The results show that the thermal stress of butterfly valve and actuator is smaller than allowable stress. The distribution of flow field in pipeline is simulated by using hydrodynamic method in Fluent. It is proved that this measure does not affect the air flow characteristics in the pipeline. Finally, the revamping work of butterfly valve and actuating mechanism is carried out on the spot. The temperature measurement and failure rate statistics of the modified butterfly valve and actuators are carried out, which proves that the measure can satisfy the actual production very well. In this paper, three measures of temperature control of butterfly valve system are put forward, and the practicability and reliability of temperature control measures of butterfly valve system are verified by finite element software. In production, the temperature control measures of butterfly valve system are implemented. The temperature of butterfly valve and actuator is reduced, the failure rate of butterfly valve system is reduced, and the product quality of hot rolling heating furnace is improved.
【学位授予单位】：武汉科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH134

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