Simulation Study on the Effect of Flue Gas on Flow Field and Rotor Stress in Gas Turbines

Guangkui Liu, Sicong Sun, Kui Liang, Xisheng Yang, Dong An, Qi Wen and Xiaohan Ren
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Guangkui Liu: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Sicong Sun: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Kui Liang: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Xisheng Yang: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Dong An: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Qi Wen: China Special Equipment Inspection & Research Institute, Beijing 100029, China
Xiaohan Ren: Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China

Energies, 2021, vol. 14, issue 19, 1-26

Abstract: A flue gas turbine is the main energy recovery equipment in a heavy oil catalytic cracking unit. Blade erosion and fracture are the main reasons for gas turbine failure. In this study, the characteristics of the flow field and rotor stress in the gas turbine under different fume volumes are simulated and analyzed by simulation software (ANSYS). The influences of fume volume on the high-temperature fume flow field, temperature, velocity, catalyst particle movement rotor stress in the gas turbine, as well as the influence law of flue gas flow on temperature gradient, pressure gradient, velocity distribution, and the main position of blade erosion were studied. The stress distribution and maximum stress position of the impeller were also determined. It was found that the variation trends of the pressure gradient in the calculation domain of the gas turbine under different fume volumes are similar. The pressure on the working face of the rotor blade decreases gradually along the flow direction of the high-temperature fume. The highest pressure appears near the sharp corner with the large radius of the front edge of the rotor blade. The variation of the fume flow rate has little influence on the temperature field of the entire machine. The erosion wear of the rotor blade mainly occurs in the leading edge and tail. The maximum stress point of the blade is located at the large fillet of the first pair of tenon teeth. The maximum stress point of the disc is located at the large fillet of the third pair of tenon teeth. It is believed that these research results have reference help for analyzing the typical failure causes of flue gas turbine, optimizing the actual operating conditions and the reconstruction design of flue gas turbine.

Keywords: fume volume; internal flow field of gas turbine; rotor stress; simulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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