Abstract

Objective To reduce the erosion wear of the moving blades of flue gas turbines caused by catalyst particles in the inlet flue gas stream of refinery catalytic cracking units， enhance the operational stability and reliability of flue gas turbines， and avoid equipment shutdowns for maintenance， it is essential to achieve effective prevention and control of erosion wear in moving blades.

Methods In this study， a single-moving blade of a flue gas turbine was taken as the research object. An experimental model of the blade was established using white light-cured acrylic resin， and black， yellow， and green resin paints were applied to visually identify the erosion areas on the blade surface. Silicon carbide （SiC） particles were used to simulate catalyst particles， and a cold-flow erosion experimental setup was established. The effects of air flow rate， catalyst particle volume concentration， and catalyst particle size in the test pipeline on the erosion areas of a single-moving blade were studied. The mass loss rate was used as an evaluation metric for the degree of erosion experienced by the blade， and the entropy evaluation method （EEM） was adopted to determine the weight values of the influence of air flow rate， air velocity， and catalyst particle size in the test pipeline on erosion degree of the single-moving blade.

Results and Discussion The erosion areas of the single-moving blade were primarily concentrated on the pressure surface. The erosion area and the degree of erosion exhibited progressive changes as erosion time， air flow rate， catalyst particle volume concentration， and particle size increased. The erosion area expanded from the blade tip to the root along the blade height direction and from the leading edge to the trailing edge along the chord direction. The leading edge wore out first， with the erosion area initially appearing black， then gray， and finally white as it spread from the upper part to the blade root along the blade height direction， indicating the most severe erosion. The wear at the blade tip occurred slightly later compared to the leading edge， with the erosion degree gradually decreasing from the leading edge to the trailing edge along the chord direction， transitioning from a mixed yellow-green color to black and then gray， reflecting relatively severe erosion. The trailing edge wore out later than the tip， with the erosion area spreading gradually from the upper part to the middle part along the blade height direction， displaying a mixed yellow-green-black color， indicating the mildest erosion. The mass loss fraction of the single-moving blade caused by SiC particles increased with elevated air flow rate， particle volume concentration， and particle size. When SiC particles had a median particle size （D₅₀） of 275 μm and an air flow rate of 1 600 m³/h， the maximum mass loss fraction reached 4.6 mg/g. At a particle volume concentration of 80 g/m³ and D₅₀ of 188 μm， the mass loss fraction peaked at 3.8 mg/g. When the SiC particle volume concentration was 80 g/m³ and the particle size in the test pipeline was 600 μm， the maximum mass loss fraction reached 6.4 mg/g. The weight values of air flow rate， particle volume concentration， and particle size in the test pipeline were 31.4%， 25%， and 43.6%， respectively. The particle size exhibited the highest weight value， while the particle volume concentration had the lowest， indicating that particle size had the greatest influence on the mass loss fraction of the single moving blade， whereas particle volume concentration had the least influence.

Conclusion The erosion areas and the degree of erosion collectively reflect the erosion characteristics caused by catalyst particle sizes on the single-moving blade. Analyzing the erosion characteristics of catalyst particles on the single-moving blade of a flue gas turbine and their influencing factors provides critical insights for enhancing turbine’s operational stability and service life.

Keywords： flue gas turbine； single-moving blade； catalyst particle； erosion area； degree of erosion； mass loss rate； erosion characteristics

Get Citation: WANG Qi， WANG Jianjun， XU Weiwei， et al. Erosion characteristics of single-moving blade of flue gas turbine caused by catalyst particles［J］. China Powder Science and Technology， 2026， 32（2）： 1-14.

Received: 2025-01-01 .Revised: 2025-06-02,Online: 2025-09-17.

Funding Project: 国家自然科学基金项目，编号：52476043。

First Author: 王琦（2000—），女，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：2304842241@qq.com。

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.1008-5548.2026.02.015

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

Serial No: 1008-5548（2026）02-0001-14