非球形颗粒在烟气轮机叶片上沉积特性的数值研究  

Numerical study on deposition characteristics of non-spherical particles on flue gas turbine blades

作　　者：王一帆[1] 许明德 王建军[1] 许伟伟[1] 张宏意 田乐辰 宋海涛 凤孟龙 WANG Yifan;XU Mingde;WANG Jianjun;XU Weiwei;ZHANG Hongyi;TIAN Lechen;SONG Haitao;FENG Menglong(College of New Energy,China University of Petroleum(East China),Qingdao 266580,China;Institute 14,Sinopec Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100089,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]中石化石油化工科学研究院有限公司14所,北京100089

出　　处：《中国粉体技术》2025年第3期195-212,共18页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52476043;炼油工艺与催化剂国家工程研究中心(中石化石油化工科学研究院有限公司)开放基金课题资助项目。

摘　　要：【目的】研究高温烟气中的催化剂颗粒在烟气轮机叶片绕流过程中的运动特性以及在叶片表面的沉积规律。【方法】采用数值模拟和实验的方法,探讨高温工况下非球形颗粒在烟气轮机叶片上的沉积过程中入口流量和入口颗粒质量浓度等因素对颗粒沉积的影响以及入口颗粒与沉积颗粒粒径分布范围的差异。【结果】设置入口风量为1200、1400m^(3)/h,颗粒质量浓度为20、40 g/m^(3),随入口风量增大,压力面沉积区域向中心收缩,吸力面沉积区域由叶根中部向后缘扩展。沉积质量随风量增大而增大。在设置的范围内,颗粒质量浓度对沉积区域和质量无明显影响。【结论】随入口流量和颗粒质量浓度增大,颗粒在烟气轮机叶片上的沉积质量增多,沉积颗粒粒径分布范围与入口颗粒基本一致。Objective Flue gas turbine is a core piece of energy-saving equipment in catalytic cracking systems.However,fouling on tur-bine blade surfaces poses significant risks to operational safety.Therefore,it is essential to conduct research on the structural mechanism of flue gas turbines.Previous studies have primarily focused on analyzing the chemical composition of fouling samples.Limited studies on the factors influencing particle deposition have often relied on cold-state experiments,leading to relatively low credibility.Using Fluent commercial software and a high-temperature deposition experimental platform,the study analyzes the factors affecting deposition.Methods Firstly,based on the critical stress model and the protrusion element model,this paper developed a user-defined func-tion(UDF)to determine particle deposition on wall surfaces.The UDF was integrated into Fluent to simulate particle behavior under varying inlet air volumes and inlet particle concentrations.Secondly,high-temperature deposition experiments were con-ducted using an authentic flue gas turbine blade model and accurately calibrated installation angles.Experimental parameters were consistent with those in the numerical simulations,ensuring consistency and enabling validation of the simulation results.Thirdly,a laser particle size analyzer was used to compare the particle size distribution of inlet particles and deposited particles.Results and Discussion Based on the UDF deposition model and high-temperature deposition experiments,the results were obtained.High-velocity zones were at the leading and trailing edges of the pressure surface of the flue gas turbine rotor blades.At the trailing edge of the pressure surface and the leading edge of the suction surface,the gas-phase velocity decreased sharply,causing inertial particle impact and potential blade erosion.When the gas phase reached the rotor blades,the flow area was reduced,causing an increase in velocity and a corresponding decrease in pressure.After passing through the rotor blades,the

关 键 词：非球形颗粒 绕流 烟气轮机 

分 类 号：TB4[一般工业技术] TQ324.8[化学工程—合成树脂塑料工业]