600MW机组双级动叶可调轴流式引风机性能研究
发布时间：2018-11-09 13:39
【摘要】：轴流通风机是一种在工农业生产中有着极其重要作用的通用机械,它广泛应用于电力,冶金等行业,尤其在火电厂中,风机是电站锅炉的主要的辅机,它的耗电是厂用电耗的30%,因此对于它的性能研究是很有必要的。 轴流风机的内部流体的流动是较为复杂的三维粘性流动,它的流动状况直接硬影响着其运行性能。因此,对于研究风机内部流动的特征是很重要的。目前,CFD技术成为分析风机内部流场特性的一个重要的手段,它可以较为准确地预测风机的性能,还可以描述其内部流动的规律,比如压力场和速度场的变化规律。 本文以某电厂600MW机组的轴流引风机为研究对象,通过现场对风机的原型进行测绘,利用Autocad对其进行三维模型的构造,然后利用Gambit对模型进行网格划分,确定计算的流域及边界条件,利用Fluent进行数值模拟计算,得出其内部流动的特性,并且对其不同工况下风机运行的几种情况以及低转速下风机的运行进行了模拟,然后将数值模拟结果与风机实际运行情况进行对比分析,结果表明数值模拟可以较准确的反应出风机内部的流体流动的真实情况,而且结果也基本上符合了电厂风机的实际运行情况,这对下一步风机的节能改造提供了重要的理论依据。
[Abstract]:Axial flow fan is a kind of universal machinery which plays a very important role in industrial and agricultural production. It is widely used in electric power, metallurgy and other industries, especially in thermal power plant, fan is the main auxiliary machine of power plant boiler. Its power consumption is 30% of power consumption, so it is necessary to study its performance. The internal flow of axial fan is a complicated three-dimensional viscous flow, and its flow condition directly affects its performance. Therefore, it is very important to study the characteristics of the flow inside the fan. At present, CFD technology has become an important means to analyze the characteristics of flow field in fan. It can accurately predict the performance of fan and describe the law of internal flow, such as the change of pressure field and velocity field. In this paper, the axial flow induced fan of 600MW unit in a power plant is taken as the research object, the prototype of the fan is mapped on the spot, the three-dimensional model is constructed by using Autocad, and then the model is meshed by Gambit. The calculated basin and boundary conditions are determined, and the characteristics of internal flow are obtained by numerical simulation with Fluent. Several conditions of fan operation under different operating conditions and the operation of fan at low speed are simulated. Then the numerical simulation results are compared with the actual operation of the fan. The results show that the numerical simulation can accurately reflect the real situation of the fluid flow inside the fan. The results basically accord with the actual operation of the fan in power plant, which provides an important theoretical basis for the energy saving transformation of the fan in the next step.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH432.1
本文编号：2320565
[Abstract]:Axial flow fan is a kind of universal machinery which plays a very important role in industrial and agricultural production. It is widely used in electric power, metallurgy and other industries, especially in thermal power plant, fan is the main auxiliary machine of power plant boiler. Its power consumption is 30% of power consumption, so it is necessary to study its performance. The internal flow of axial fan is a complicated three-dimensional viscous flow, and its flow condition directly affects its performance. Therefore, it is very important to study the characteristics of the flow inside the fan. At present, CFD technology has become an important means to analyze the characteristics of flow field in fan. It can accurately predict the performance of fan and describe the law of internal flow, such as the change of pressure field and velocity field. In this paper, the axial flow induced fan of 600MW unit in a power plant is taken as the research object, the prototype of the fan is mapped on the spot, the three-dimensional model is constructed by using Autocad, and then the model is meshed by Gambit. The calculated basin and boundary conditions are determined, and the characteristics of internal flow are obtained by numerical simulation with Fluent. Several conditions of fan operation under different operating conditions and the operation of fan at low speed are simulated. Then the numerical simulation results are compared with the actual operation of the fan. The results show that the numerical simulation can accurately reflect the real situation of the fluid flow inside the fan. The results basically accord with the actual operation of the fan in power plant, which provides an important theoretical basis for the energy saving transformation of the fan in the next step.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH432.1
【参考文献】
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