燃煤电站除尘器前烟道磨损特性与优化研究  

Investigation and Optimization on Erosion Characteristics of the Flue Gas Pipe Before the Dust Collector in Power Plants

作　　者：刘荣堂 王宇[1] 刘明[1] 严俊杰[1] LIU Rong-Tang;WANG Yu;LIU Ming;YAN Jun-Jie(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安市710049

出　　处：《工程热物理学报》2019年第4期808-812,共5页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展规划资助项目(No.2015CB251504);国家自然科学基金(No.51436006)

摘　　要：磨损是制约燃煤电站烟风煤粉管道运行可靠性的重要问题,其中除尘器前烟道段结构复杂且磨损问题突出。为此,本文基于DPM离散相模型结合固壁反弹经验公式及E/CRC磨损模型,对某燃煤机组除尘器前烟道段的磨损特性及结构优化展开研究.结果表明,旋涡携带粒子造成的磨损是管壁磨损的主要因素,其磨损率约为粒子直接撞击造成磨损的1.66倍.本文提出的3种优化烟道结构改善了流场,使得管道阻力以及磨损率大幅度下降,最大可分别下降167.9 Pa与38.993×10^(-4)g·m^(-2)·s^(-1),并得到了综合考虑阻力、流量分配以及磨损特性的最优改造方案.Erosion is an important problem that restricts the operation reliability of power plants.The structure of the flue before the dust collector of coal-fired power plants is complicated and the erosion is prominent. In order to investigate and optimize the erosion characteristics of this flue section, simulation models were developed based on the DPM model, the empirical formula of solid wall rebound and E/CRC model. Results show that: The erosion caused by the vortex carrying particles is the main factor of pipe wall wear. The erosion rate is about 1.66 times than that of the direct impact of particles. Three optimized flue structures were proposed in this paper to improve the flow field. The flow resistance and erosion decline substantially, and the largest reductions are 167.9 Pa and 38.993×10^-4 g·m^-2·s^-1, respectively. Meanwhile, the optimal flue structure, considered the evaluation indexes including resistance,flow distribution and erosion characteristics,is obtained.

关 键 词：数值模拟 DPM 磨损 结构优化 烟风管道 

分 类 号：TK124[动力工程及工程热物理—工程热物理]