高温烟气环境下电厂轴流引风机运行特性研究
发布时间：2018-07-31 09:13
【摘要】：在我国有大量的风机设备应用在整个火力发电机组中,引风机是把燃料燃烧后所生成的烟气从锅炉中抽出,并排入大气。其主要输送含有灰渣、飞灰和含焦油状态馏分的烟气,而且温度较高,相对于其他风机其工作环境较为复杂,风机的运行情况也与常规风机有所不同,因此对于长期处于高温烟气环境下工作的引风机运行特性进行研究,分析烟气温度对风机性能参数的影响,把握高温环境下引风机运行特性的规律,具有极高的现实意义和工程价值。本文以某2%s600MW燃煤电厂所应用的AP系单级动叶可调轴流引风机为研究对象,利用计算流体力学手段,对该风机建模后进行数值模拟,分别比较不同烟气温度下风机运行特性、气动噪声以及叶片磨损情况,进而分析高温烟气环境下引风机运行的特点,最后针对高温烟气环境,对引风机性能影响较大的叶顶间隙进行探讨,分析不同叶顶间隙下风机性能以及机理。得到结论如下:(1)对不同的进口烟气温度下引风机运行的流场分布进行数值模拟,可以发现随着烟气温度的升高,引风机全压明显降低,引风机能量损失增大;在引风机叶片压力面形成明显的高压区并随温度升高,高压区域逐渐变小;烟气流速逐渐增大,相邻叶片之间流场相互影响增强;引风机噪声大小随烟气温度的变化并未有较大的变化,但随着烟气温度的升高,其噪声主要以漩涡噪声为主,噪声源位置逐渐向叶顶部位移动。(2)在前文模拟的基础上,添加固体颗粒模型,分析高温烟气环境下引风机的叶片磨损情况,得出随着烟气温度的增大,引风机叶片磨损情况逐渐严重,且引风机叶片的磨损主要集中在叶片压力面靠近叶跟的下半部分,磨损最严重的区域出现在叶片压力面中部的前缘位置。(3)针对引风机实际工作的高温烟气环境,对引风机性能参数影响较大的叶顶间隙进行模拟分析,得到高温烟气环境下,叶顶间隙增大,引风机全压减小;叶顶泄漏增强并形成泄漏涡,涡首先在叶片吸力面形成逐渐向叶片前缘以及压力面移动;引风机噪声不断增大,叶片磨损也不断严重。通过以上分析研究,较为全面的得到了高温烟气环境下电厂轴流引风机的运行特性及特点规律,对于实际中的风机改造及理论研究提供了一定的研究基础。
[Abstract]:In our country, a large number of fan equipments are used in the whole thermal power generating unit. The induced fan is to draw the flue gas from the boiler after burning the fuel and then discharge it into the atmosphere. It mainly conveys flue gas containing ash, fly ash and tar state fraction, and its temperature is higher, compared with other fans, its working environment is more complex, and the operation of fan is different from that of conventional fan. Therefore, the operating characteristics of the induced fan working in the high temperature smoke environment for a long time are studied, the influence of flue gas temperature on the performance parameters of the fan is analyzed, and the law of the operating characteristics of the induced fan under the high temperature environment is grasped. Has the extremely high realistic significance and the engineering value. In this paper, the single stage adjustable axial fan of AP system used in a 2%s600MW coal-fired power plant is taken as the research object. By means of computational fluid dynamics, numerical simulation is carried out on the fan after modeling, and the operating characteristics of the fan under different flue gas temperature are compared respectively. The aerodynamic noise and blade wear are analyzed, and the characteristics of induced fan operation in high temperature flue gas environment are analyzed. Finally, the blade top clearance which has great influence on the performance of induced fan is discussed in the high temperature flue gas environment. The performance and mechanism of fan under different blade top clearance are analyzed. The conclusions are as follows: (1) numerical simulation of the flow field distribution of the induced fan under different inlet flue gas temperature shows that with the increase of the flue gas temperature, the total pressure of the induced fan decreases obviously, and the energy loss of the induced fan increases; An obvious high pressure area is formed on the blade pressure surface of the induced fan and the high pressure area becomes smaller with the increase of temperature, and the flue gas velocity increases gradually, and the flow field interaction between adjacent blades increases. The noise of induced fan does not change greatly with flue gas temperature, but with the increase of flue gas temperature, the noise is mainly whirlpool noise, and the position of noise source gradually moves to the top of the blade. (2) on the basis of the previous simulation, Adding solid particle model, the blade wear of induced fan under high temperature smoke environment is analyzed. It is concluded that with the increase of flue gas temperature, the wear situation of induced fan blade becomes more and more serious. Moreover, the wear of the induced fan blade is mainly concentrated in the lower part of the blade pressure surface near the lower part of the blade heel, and the most serious area appears in the leading edge position in the middle of the blade pressure surface. (3) aiming at the high temperature flue gas environment of the actual work of the induced fan, Based on the simulation and analysis of the blade tip clearance which has a great influence on the performance parameters of the induced fan, it is found that under the high temperature flue gas environment, the tip clearance increases, the total pressure of the induced fan decreases, the leakage at the top of the blade increases and the leakage vortex forms. Firstly, the vortex gradually moves to the front edge of the blade and the pressure surface in the suction surface of the blade, and the noise of the induced fan increases and the wear of the blade becomes more serious. Through the above analysis and research, the operating characteristics and characteristics of axial flow induced fans in power plant under high temperature flue gas environment are obtained, which provides a certain research basis for the actual fan transformation and theoretical research.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.7
本文编号：2155118
[Abstract]:In our country, a large number of fan equipments are used in the whole thermal power generating unit. The induced fan is to draw the flue gas from the boiler after burning the fuel and then discharge it into the atmosphere. It mainly conveys flue gas containing ash, fly ash and tar state fraction, and its temperature is higher, compared with other fans, its working environment is more complex, and the operation of fan is different from that of conventional fan. Therefore, the operating characteristics of the induced fan working in the high temperature smoke environment for a long time are studied, the influence of flue gas temperature on the performance parameters of the fan is analyzed, and the law of the operating characteristics of the induced fan under the high temperature environment is grasped. Has the extremely high realistic significance and the engineering value. In this paper, the single stage adjustable axial fan of AP system used in a 2%s600MW coal-fired power plant is taken as the research object. By means of computational fluid dynamics, numerical simulation is carried out on the fan after modeling, and the operating characteristics of the fan under different flue gas temperature are compared respectively. The aerodynamic noise and blade wear are analyzed, and the characteristics of induced fan operation in high temperature flue gas environment are analyzed. Finally, the blade top clearance which has great influence on the performance of induced fan is discussed in the high temperature flue gas environment. The performance and mechanism of fan under different blade top clearance are analyzed. The conclusions are as follows: (1) numerical simulation of the flow field distribution of the induced fan under different inlet flue gas temperature shows that with the increase of the flue gas temperature, the total pressure of the induced fan decreases obviously, and the energy loss of the induced fan increases; An obvious high pressure area is formed on the blade pressure surface of the induced fan and the high pressure area becomes smaller with the increase of temperature, and the flue gas velocity increases gradually, and the flow field interaction between adjacent blades increases. The noise of induced fan does not change greatly with flue gas temperature, but with the increase of flue gas temperature, the noise is mainly whirlpool noise, and the position of noise source gradually moves to the top of the blade. (2) on the basis of the previous simulation, Adding solid particle model, the blade wear of induced fan under high temperature smoke environment is analyzed. It is concluded that with the increase of flue gas temperature, the wear situation of induced fan blade becomes more and more serious. Moreover, the wear of the induced fan blade is mainly concentrated in the lower part of the blade pressure surface near the lower part of the blade heel, and the most serious area appears in the leading edge position in the middle of the blade pressure surface. (3) aiming at the high temperature flue gas environment of the actual work of the induced fan, Based on the simulation and analysis of the blade tip clearance which has a great influence on the performance parameters of the induced fan, it is found that under the high temperature flue gas environment, the tip clearance increases, the total pressure of the induced fan decreases, the leakage at the top of the blade increases and the leakage vortex forms. Firstly, the vortex gradually moves to the front edge of the blade and the pressure surface in the suction surface of the blade, and the noise of the induced fan increases and the wear of the blade becomes more serious. Through the above analysis and research, the operating characteristics and characteristics of axial flow induced fans in power plant under high temperature flue gas environment are obtained, which provides a certain research basis for the actual fan transformation and theoretical research.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.7
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