脉冲袋式除尘器喷吹清灰性能工艺参数优化试验研究

发布时间：2018-03-02 06:12

本文关键词： 脉冲袋式除尘器清灰均匀性物理试验数值模拟正交试验　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着袋式除尘器的大型化,除尘技术面临的清灰均匀性问题变得越来越突出。如何提高滤袋流量分配的均匀性,改善清灰效果,成为工程设计中需要考虑的主要问题。论文结合物理模型试验和数值模拟的方法,对影响固定行喷吹系统和回转定位喷吹系统清灰均匀性的工艺参数进行了优化研究,得出以下结论:(1)在1:1的物理模型试验台上对固定行喷吹系统进行喷吹均匀性优化试验得出,通过改变喷嘴直径能够将喷嘴出口的流量偏差控制到10%以内,有效提高喷吹系统的清灰均匀性。(2)在物理模型试验验证了单条滤袋数值模拟模型可靠性的基础上,通过数值模拟的正交试验得出滤袋长度、喷嘴直径、滤袋直径以及导流管的设置对脉冲清灰气流均匀性的影响依次减小。并以直径为160mm的滤袋为例研究了滤袋长度和喷吹压力之间的关系,结果表明超长滤袋的使用在实际运行中具有一定的可操作性。(3)在物理模型试验的基础上验证了行喷吹管数值模拟模型的可靠性。通过数值模拟的方法,利用正交试验得出喷吹管直径和喷吹压力对喷吹气流均匀性影响较大,喷嘴直径和喷嘴个数影响较小,为设计选型提供了参考依据。(4)通过物理模型试验发现,采用低压回转定位喷吹技术时喷吹管的喷吹均匀性较高。扁圆形滤袋的壁面峰值压力在同一截面上分布均匀,径向分布趋势与普通圆形滤袋相同。且在试验条件下得出最佳喷吹条件为喷吹时间150ms,喷吹距离200mm,喷吹压力不超过0.08MPa。(5)分析比较物理模型试验和数值模拟试验的结果得出,回转管和扁圆形滤袋的数值模拟模型在误差允许范围内满足工程需求,为后续研究回转管喷吹技术奠定了基础。
[Abstract]:With the large scale of bag dust collector, the homogeneity problem of dust removal technology is becoming more and more prominent. How to improve the uniformity of the flow distribution of filter bag and improve the ash removal effect, It has become the main problem to be considered in engineering design. Combined with physical model test and numerical simulation, the process parameters affecting the soot homogeneity of fixed row injection system and rotary positioning injection system are optimized and studied in this paper. The following conclusion is drawn: (1) on the physical model test bench of 1: 1, the injection uniformity optimization test of the fixed row injection system is carried out. It is concluded that by changing the nozzle diameter, the flow deviation of the nozzle outlet can be controlled to less than 10%. On the basis of verifying the reliability of numerical simulation model of single filter bag, the length of filter bag and the diameter of nozzle are obtained by orthogonal test of numerical simulation. The influence of the diameter of the filter bag and the setting of the diversion tube on the uniformity of the air flow of the pulse ash removal decreased in turn, and the relationship between the length of the filter bag and the injection pressure was studied by taking the filter bag with the diameter of 160 mm as an example. The results show that the ultra-long filter bag is feasible in practical operation. The reliability of the numerical simulation model is verified on the basis of the physical model test. By orthogonal test, it is found that the diameter of nozzle and the pressure of injection have great influence on the uniformity of air flow, while the diameter of nozzle and the number of nozzles have little influence, which provides a reference basis for design selection. The injection uniformity of the nozzle is higher when the low pressure rotary position injection technology is used. The peak pressure on the wall of the flat circular filter bag is distributed uniformly on the same section. The radial distribution trend is the same as that of the ordinary circular filter bag. Under the experimental conditions, the optimum injection conditions are as follows: injection time 150ms, injection distance 200mm, injection pressure not more than 0.08MPa.g5) the results of physical model test and numerical simulation test are compared and compared. The numerical simulation model of the rotary tube and the flat circular filter bag can meet the engineering requirements within the range of error, which lays a foundation for the further study of the rotary tube injection technology.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.2

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