Design Analysis And Experimental Study Of Rotary Atomizer With High Speed Flexible Rotor For Flue Gas Treatment Of Waste-to-energy Plant

"Semi-dry" flue gas treatment process developed from spray drying technology.The process has high treatment efficiency,and the solid waste can be treated easily.It is widely used in the field of Waste-to-Energy Plant.With the increasing of the daily disposal capacity of Waste-to-Energy Plant,the "semi-dry" flue gas treatment system usually adopts high speed rotary atomizer with an injection volume of more than10000kg/h.However,high speed rotary atomizer of Waste-to-Energy Plant is mainly dependent on imports in our country.The domestic atomizer has some disadvantages,such as service life,reliability,anti-interference ability and low degree of automation.It is urgent to master the key technologies such as the reliability design of atomizing disk,the design and dynamic characteristic analysis technology of high-speed flexible rotor system of rotating shaft-atomizing disk,the design of nozzle structure and the manufacturing of key parts of atomizer.Thus we catching up foreign product in the feeding liquid handling capacity,the anti-interference capability and service life.Address the above problems,this paper focuses on the study of a high speed rotary atomizer with a wear resistance disk,designs a principle prototype,carries out trial production of the prototype,and carries out the performance experiment of the prototype.Through simulation calculation and experiment,the simulation model of rotary atomizer is established and the experimental data are obtained,which provides theoretical and technical support for the localization of high speed rotary atomizer for Waste-to-Energy Plant.Specific research contents and main work include:(1)Aiming at the fatigue failure caused by high speed rotation and high temperature of atomizing disk,the rotating deformation and temperature distribution of atomizing disk were studied by using finite element method.The stress and deformation rules of different material atomization disks due to high-speed rotation are obtained,meanwhile the distribution rules of thermal stress and thermal deformation are obtained.It provides basis for structure design and material selection of atomizing disk;(2)For the high-speed flexible rotor system of rotating shaft and atomizing disk,the modal and critical speed are analyzed by using the centralized parameter method and the finite element method.The reasonable speed range of the atomizer was determined and the influence law of the structural parameters of the rotor system on its mode and critical speed was obtained;(3)Aiming at the problems of nozzle wear and particle size distribution,the finite element method was used to calculate and analyze the shear stress on the inner wall of the nozzle and the distribution of particle size of drops under different conditions,and the influence rules of nozzle structure parameters and rotating speed on nozzle wear and particle size distribution were obtained.At the same time,the coupling flow field of the rotary atomizer and the spray tower was simulated by finite element method,and the influence of feed rate and flue gas inlet velocity on the temperature distribution in the spray tower was obtained;(4)A high speed rotary atomizer prototype with a rated speed of 15000r/min,a feeding liquid processing capacity of 12000kg/h and a wear resistance atomizing disk was trial-produced.The free modal test of the rotating shaft and the performance experiment of the whole machine were carried out to verify the rationality of the design.