WANG Yifan¹，XU Mingde^2*，WANG Jianjun¹，XU Weiwei¹，ZHANG Hongyi¹，TIAN Lechen¹，SONG Haitao²， FENG Menglong² 

 1. College of New Energy，China University of Petroleum （East China），Qingdao 266580，China； 

 2. Institute 14，Sinopec Research Institute of Petroleum Processing Co.，Ltd.，Beijing 100089，China

Abstract

Objective　Flue gas turbine is a core piece of energy-saving equipment in catalytic cracking systems.However，fouling on turbine 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 function（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 conducted 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 flow area expanded，causing the velocity to drop and the pressure to rise.This change formed a pressure gradient force that opposed the mainstream direction，leading to boundary layer separation and potential particle deposition.The pressure distribution around the rotor blades exhibited systematic variation，with the highest pressure occurring at the leading edge of the pressure surface and gradually decreasing as it moved away from the blade.Conversely，the lowest pressure occurred at the leading edge of the suction surface and gradually increased away from the blade.A small low-pressure zone existed at the leading edge of the suction surface，resulting in a steep pressure gradient that destabilized fluid flow.In the presence of particles， this flow instability exacerbated blade erosion，increased surface roughness， and intensified particle deposition.Changes in inlet flow rates impacted both the deposition area and mass of non-spherical particles.The deposition area on the pressure surface gradually contracted from the entire surface to the central region，with an increase in deposition mass. On the suction surface，the deposition area expanded from the middle of the blade root towards the trailing edge，with the deposition mass also increasing as the flow rate rose.In contrast，variations in inlet particle concentration had minimal impact on the deposition area，but the deposition mass increased significantly with the increase in inlet particle concentration.Factors such as inlet flow rate， particle concentration，and particle shape had little effect on size distribution range of deposited particles.

Conclusion　Higher inlet flow rates and particle mass concentrations result in greater particle deposition mass，while the size distribution of deposited particles remains unchanged.These findings provide a theoretical basis for studying the movement characteristics of catalyst particles in high-temperature flue gas，the interaction with blade surfaces，and deposition patterns.

Keywords： non-spherical particle； flow diversion； deposition； numerical simulation

Get Citation:WANG Yifan，WANG Jianjun，XU Weiwei，et al.Numerical study on deposition characteristics of non-spherical particles on flue gas turbine blades［J］.China Powder Science and Technology， 2025， 31（3）： 195−212.

Received：2024-09-04.Revised:2024-11-25,Online:2025-03-05.

Funding Project：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。

First Author:王一帆（2000—），男（满族），硕士生，研究方向为气固−气液、多相流动过程及旋流分离技术。E-mail：1150163431@qq.com。*为并列第一作者。

Corresponding Author:

王建军（1971—），男，副教授，博士，硕士生导师，研究方向为气固-气液、多相流动过程及旋流分离技术。E-mail：wangjj01@upc. edu. cn。

DOI：10.13732/j.issn.1008-5548.2025.03.017

CLC No:TB4； TQ324.8               Type Code:A

Serial No:1008-5548（2025）03-0195-18