Study On Dynamic Characteristics Of Anti-corrosion Equipment For Inside Wall Of Tower Under Extreme Working Conditions

The exhaust tower of the power plant and the chemical industry need to be sprayed paint to prevent corrosion,the traditional manual spraying method is not only low efficiency and high cost,but also has the potential safety hazards of construction workers,such as flue gas poisoning,engineering accidents and so on.In this paper,a kind of automatic corrosion protection equipment in the tower is studied,which can realize safe operation with high efficiency and low consumption.There are many extreme conditions such as partial load,acceleration start and airflow disturbance in the operation of corrosion protection equipment,resulting in equipment reverse,overturning and so on.Therefore,it is of great significance to study the dynamic characteristics of corrosion protection equipment in the tower under extreme conditions.This paper expounded the rationality of the wire rope guide system,calculated the expression of equivalent lateral stiffness of the wire rope guide,which provide a basis for the study of the lateral dynamic characteristics of the equipment under partial load conditions;Established the mathematical model of lateral motion under partial load according to the principle of dynamics,obtained the lateral dynamic characteristics of the equipment,and used Adams software to establish the bushing model of wire rope,obtained the relation curve between lateral displacement,lateral deflection and lifting height;Established the longitudinal vibration equation based on the continuous elastomer theory,and used the separation of variables and generalized coordinate method to solving the vibration equation,obtained the acceleration responses of the equipment,then obtained the optimal acceleration control equation through the Simulink simulation,which can effectively restrain the vibration behavior of the equipment when it is accelerating with full load;Studied on the influence of airflow disturbance on the operation of the equipment in the tower by using Fluent dynamic mesh technique,obtained the effects of various factors on the longitudinal and lateral airflow disturbances.The results show that with the increase of the running time,the lateral displacement of the equipment centroid under the offset load increases firstly,and then decreases gradually after reaching the maximum displacement of 48mm at 25s,and the deflection direction of the equipment is periodically changed with 5s,the lifting height of the equipment in one cycle is 10m,the maximum deflection is 0.12rad,about 6.88 degrees;When the K is a positive integer,the trapezoidal acceleration control curve not only limits the longitudinal vibration of the equipment at the beginning and the end of the acceleration process,but also keep acceleration constant in the middle stage;At the same time,the peak value of the dynamic tension under the trapezoidal acceleration control curve is the smallest when K=1,which is 15.2kN,so the trapezoidal acceleration control curve has the best effect on the longitudinal vibration suppression;The airflow disturbance is the most severe when it is 4s after starting to accelerate,the pressure difference between the top and bottom of the equipment reaches the peak value of 129.39Pa,and the peak value of airflow velocity at the same time reaches the maximum value of 11.33m/s;The airflow disturbance in the vertical direction of the equipment is positively correlated with blocking ratio and the difference between the operating speed and the wind speed,the horizontal airflow disturbance is positively correlated with equipment displacement,deflection and wind speed.The research provides a theoretical basis and a numerical basis for the stable and efficient application of the anti-corrosion equipment for inside wall of tower,It also provides a new idea for the study of the dynamics of the automatic lifting equipment.