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.
Highlights
A gas turbine is the main energy recovery equipment in a heavy oil catalytic cracking unit and belongs to typical turbine machinery [1,2,3]
The effect of the fume flow rate on the high-temperature fume flow field, catalyst movement trajectory, and rotor blade erosion was studied in detail
After the fume flows into the rotor blade runner, its uneven flow is caused by the impact effect, a circumstance which leads to the increase of the pressure is caused by the impact effect, a circumstance which leads to the increase of the pressure gradient
Summary
A gas turbine is the main energy recovery equipment in a heavy oil catalytic cracking unit and belongs to typical turbine machinery [1,2,3]. The effects of the two inlet fume flow rates on the internal flow field and particle movement of the catalytic cracking gas turbine were analyzed They confirmed that with the increase of the flow rate, the static pressure, static temperature, molecular viscosity, and gas velocity in the stator runner increased. On the basis of the Euler–Lagrange model, Chen et al [19] studied the gas–solid two-phase flow characteristics in a catalytic cracking gas turbine They confirmed that the distribution of gas velocity and pressure in the fume runner was the main factor for the collision and deposition between solid particles and the blade surface. The effect of the fume flow rate on the high-temperature fume flow field, catalyst movement trajectory, and rotor blade erosion was studied in detail.
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