The Cold Experimental Research Of Particles Deposition On Flue Gas Turbine Rotating Blade Surface

Flue gas turbine can recycle the energy of high temperature flue gas as the core equipment of fluid catalytic cracking unit energy recovery system.It has obvious economic benefits and long-term social significance to recycle the energy make full use of flue gas turbine for energy conservation and emission reduction.The catalyst particles will deposit and scale on blade surface inside flue gas turbine in the operation of flue gas turbine.We need to solve the problem in order to make the flue gas turbine run safely for a long period of time.So this paper design and machine the experimental flue gas turbine model,and carry out the cold experimental research of particles deposition on flue gas turbine rotating blade surface.The experimental machine model of flue gas turbine is contractible model 2.5 times less than real refinery flue gas turbine,so the blade profile of experimental machine model is the same as real flue gas turbine.This paper studied the influence of inlet air flow,inlet feed concentration and inlet particle size on particle deposition on the surface of dynamic experimental flue gas turbine blade.This cold experiment used normal temperature talcum powder particles in place of high temperature catalyst particles through the comparative analysis of the talcum powder particles and catalyst particles.This cold experiment determined the gas phase and solid phase operation parameters by the similarity calculation and analysis.Measurement results of deposition weight show that the deposition weight is decreased with increasing air flow,and with the increase of air flow,the decreasing trend of deposition weight is constantly slow.The smaller the particle size,the faster the decrease speed of deposition weight.When the concentration is low,deposition weight is gradually increasing with the increase of concentration.When the concentration increases to a certain extent?the experimental condition 10g/m³?,the deposition weight along with the change of the concentration is not constantly changing,and remains in the steady state.When the concentration and air flow remain the same,the smaller the particle size,the greater the deposition weight.Measurement results of deposited particles sizes show that deposited particles sizes is unchanged with the increase of inlet air flow when the inlet particles sizes is small(dp₅₀=4?m).When the inlet particles sizes is bigger(dp₅₀=8?m),deposited particles sizes is decreased with the increase of inlet air flow.The bigger the inlet particles sizes,the faster the decrease speed of deposited particles sizes with the increase of inlet air flow.When the inlet particles sizes dp₅₀ is 16?m,deposited particles sizes decrease rapidly with the increase of inlet air flow.Deposited particles sizes is decreased with the increase of inlet feed concentration,and the bigger the particles sizes,the faster the decrease speed of deposited particles sizes with the increase of inlet feed concentration.Particles size smaller than 40?m is easy to deposit on the surface of flue gas turbine rotating blade,and the probability that these particles deposit on the blade surface is the same.The research results of this paper can use for reference to formulate operation rules of real refinery flue gas turbine,and can provide effective data support for controlling or restraining particle deposition and scaling.