Experimental Research On The Characteristics Of High-Temperature Deposition Of Particles Under Flow Impact Conditions

Flue gas turbine is an important equipment for energy recovery of high temperature flue gas in catalytic cracking unit,its safe and stable operation is of great significance for the safe production and energy saving of catalytic devices.With the development of refining processes and the decline in the quality of raw oil,the problem of deposition and scaling of catalyst particles on the blade of the flue gas turbine in the high-temperature flue gas becomes more and more prominent,resulting in frequent failure rate of the flue gas turbine,which seriously affects the continuous production of the entire catalytic cracking workshop.Therefore,it is necessary to study the deposition of particles in the high-temperature flue gas.This paper designed a set of dynamic high temperature flue gas particle inertial impact deposition experiment system in order to study the deposition of particles under high temperature conditions,studying the deposition process of powder particles in the state of flowing and impacting on the blade substrate.The experimental study was conducted using talcum powder particles with more obvious deposition rules instead of catalyst particles.This experiment studied the effects of temperature,inlet particle concentration,particle size,and surface characteristics on the particle deposition on the surface of blade,and conducted the comparative analysis of the particle deposition morphology,deposition mass and deposition particle size distribution.The results of the study are as follows: The deposition mass of particles decreases with increasing temperature,and after the temperature rises to a certain extent,the decreasing trend slows down.The deposition particles size increases with increasing temperature.The larger the inlet particle size,the more obvious the tendency of the deposition particle size to increase with increasing temperature.The particle deposition mass increases as the inlet particle concentration increases.As the temperature of the experiment increases,the effect of particle concentration on the deposition mass decreases.The deposition particle size decreases with the increase of the inlet particle concentration,and the larger the inlet particle size,the more obvious the decreasing trend is.Under the same experimental conditions,the deposition mass of the inlet material particles with median particle size of 4 ?m,8 ?m,and 16 ?m decreased in sequence.The best adhesion of particles with a median particle size of 4?m.Deposition is more likely to occur when the particle size is less than 10?m.The particles with median particle size of 4 ?m is more likely to agglomerate at higher temperatures,leading to increased particle size of the deposited particles.The blade protective coating reduces the surface roughness and significantly reduces the deposition of particles on the surface of the blade,but has little effect on the particle size distribution of the deposited particles.The above experimental results can provide data support and technical guidance for suppressing particle deposition and scaling in on-site flue gas turbines.