基于叶片安装角调节的对旋局部通风机特性研究

发布时间：2018-03-16 18:06

本文选题：对旋局部通风机　切入点：叶片安装角　出处：《太原理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着开采深度的增加,煤矿会形成复杂的多区域通风系统,呈现出通风阻力过大、采掘地点风量不足、风机效率降低等一系列问题。因此,常常采用高功率的局部通风机配合大直径高强风筒,来实现深远巷道的掘进通风,最远可达2000m以上。而在掘进巷道的过程中,对旋风机并不能一直在高效区运行。长期处于非设计工况下,不仅效率低,造成能源浪费,还会影响工作面的正常作业。因此,研究基于安装角变化的对旋局部通风机调节性能及其内部流动情况,对其合理运行及改善工作面作业环境具有重要意义。利用计算流体力学(Computational Fluid Dynamics)软件Fluent对FBD No8.0 2×55k W型风机进行了全流场定常数值模拟,探讨了样机第一、二级叶轮叶片安装角变化对其自身性能的影响机理,得出了不同安装角所对应的风机性能曲线以及内流特征,并结合试验,验证了仿真结果;比较不同安装角调节方式对性能影响的区别,为根据工况合理选择安装角,实现风机的高效节能运行,避免电机过载提供了依据。研究表明,同时增加两级安装角,风机的全压曲线向右上移动,在大流量、低风压的工况下运行效率高,两级轴功率增加,匹配度高,但第二级负载增长幅度大于第一级;通过改变安装角能满足不同的工况需求,在改变任意一级安装角相同角度的情况下,风机的性能相似,而且运行效率受第二级叶片的影响较大;减小后级叶片安装角能降低负载,且前级基本不受影响;如果改变第一级安装角,除第一级轴功率发生变化外,第二级轴功率也会随之增大或减小。另外,以500m和2000m作为短距离通风和长距离通风的代表,分别结合管网和不同安装角时风机的性能曲线进行分析。短距离通风时,工作面所需要的风量和风压较小,调小叶片安装角能够有效的减小风机的输出功率,节省能耗;长距离通风时,需要的风量和风压较大,适当增加叶片安装角可以满足工作面高风压和大流量的需求。但是,要注意增大安装角是否会使电机超载。最后,对转速和安装角调节进行了对比分析。根据工况对风机进行调整,能够实现其高效运行,最终达到节能减排的目的。本文还提出了外置单电机可调对旋风机,一方面利用机械结构调节叶片安装角,使其在实现叶片安装角调节的基础上,实现了结构紧凑,调节方便的目的;另一方面,将双电机带动双叶轮的传统对旋风机结构进行优化,提出了单电机外置对旋方案,利用传动箱将单一动力分别传输至两级叶轮,有效的解决了现有风机电机维护难、功率不匹配等问题。结合ADAMS对叶片调节模块进行了多体动力学分析,得出了前后级的调节范围分别是-18°到10°和-5.5°到5.5°,以及两级传动比非恒定的结论,为研究和改进机构奠定了基础。
[Abstract]:With the increase of mining depth, the coal mine will form a complex multi-area ventilation system, which presents a series of problems, such as excessive ventilation resistance, insufficient air volume in mining sites, and reduced fan efficiency, etc. High power local fan combined with large diameter high strength tuyere is often used to realize tunneling ventilation of far-reaching roadway, as far as 2000m. However, in the process of tunneling, The cyclone can not always run in the high efficiency zone. It is not only low efficiency, resulting in energy waste, but also affects the normal operation of the working face for a long time in the off-design condition. The regulating performance and internal flow of the counterrotating local fan based on the change of installation angle are studied. It is of great significance to operate reasonably and improve the working environment of the working face. The numerical simulation of the whole flow field of the FBD No8.0 2 脳 55kW fan is carried out by using the Computational fluid Dynamics (Fluent) software Fluent, and the first one of the prototype is discussed. The influence mechanism of the installation angle of the secondary impeller blade on its own performance is obtained. The fan performance curve and the characteristics of the inner flow corresponding to the different installation angles are obtained, and the simulation results are verified by the test. By comparing the influence of different adjustment ways of installation angle on performance, this paper provides a basis for reasonably selecting installation angle according to the working conditions, realizing the efficient and energy saving operation of the fan and avoiding the overload of the motor. The research shows that the two-stage installation angle is increased at the same time. The full pressure curve of the fan moves to the upper right, under the condition of large flow rate and low wind pressure, the operation efficiency is high, the power of the two stage axis is increased, and the matching degree is high, but the increase range of the second stage load is larger than that of the first stage. By changing the installation angle, the performance of the fan is similar, and the operation efficiency is greatly affected by the second stage blade. Reducing the installation angle of the rear stage blade can reduce the load, and the front stage is basically unaffected. If the installation angle of the first stage is changed, the second stage shaft power will increase or decrease in addition to the change of the first stage axial power. Taking 500m and 2000m as representatives of short distance ventilation and long distance ventilation, the performance curves of the fan are analyzed in combination with pipe network and different installation angles, respectively. Adjusting the installation angle of the blade can effectively reduce the output power of the fan and save energy consumption. When the ventilation is long distance, the air volume and the wind pressure need to be larger, so increasing the angle of the blade installation can meet the demand of high wind pressure and large flow in the working face. It is necessary to pay attention to whether the motor overload will be caused by increasing the installation angle. Finally, the adjustment of speed and installation angle is compared and analyzed. The fan can be operated efficiently by adjusting the fan according to the working conditions. Finally, the purpose of energy saving and emission reduction is achieved. On the one hand, the mechanical structure is used to adjust the installation angle of the blade, so that the structure of the turbine can be compact based on the adjustment of the installation angle of the blade. On the other hand, the structure of the cyclone is optimized by the traditional method of driving double impellers with double motors, and the scheme of external counterrotation of single motor is put forward, and the single power is transferred to two stage impellers by transmission box. The problems such as difficult maintenance of fan motor and mismatch of power are effectively solved. The multi-body dynamics analysis of blade regulation module is carried out with ADAMS. It is concluded that the adjustment ranges of the front and rear stages are -18 掳to 10 掳and -5.5 掳to 5.5 掳, respectively, and that the ratio of the two stages of transmission is unsteady, which lays a foundation for the study and improvement of the mechanism.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD441

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