Analysis Of Wind Load And Wind Vibration Response Of Air-cooled Structure In A Thermal Power Plant

China is a country rich in coal and short of water.The cooling device of traditional thermal power generation consumes a lot of water resources.As a new cooling water process,air cooled condenser cooling water process is widely used in large thermal power plants in China.The cooling water process of air condenser has the advantages of saving water resources,environmental protection and high comprehensive benefits.The structure of air-cooled structure is complex.The lower part has large-diameter reinforced concrete pipe column(37.5m high),the middle part is steel platform,the upper part is A-type support(more than 10 m high)and thousands of tons of equipment.At the same time,the steel platform is surrounded by a large size wind wall,the whole structure is rigid and flexible.In addition,the modal analysis of the structure shows that the natural vibration period of the structure is about 1.7s,and the wind load is short cycle The period composition is close,so the influence of wind load cannot be ignored.Based on a 2 × 600 MW air-cooled structure,this paper focuses on the wind load parameters and wind-induced vibration of the air-cooled structure.The main work is as follows:(1)Use the DM module of ANSYS Workbench platform for air cooling structure of numerical wind tunnel was established,and the partition,and then the grid was divided by ANSYS Mesh for polyhedron grid generation,and imported into FLUENT use and can realize the turbulence model,at the same time use the UDF wind speed of the inlet boundary index law of profile,turbulent kinetic energy and turbulence dissipation rate programming and import the boundary conditions,finally obtaining the coefficient of size for each partition air cooling structure.(2)ABAQUS was used to model the dynamic analysis of the air-cooled structure,and a lot of reasonable simplification was made during the modeling.The entire model was made of beam elements,and the equipment was transformed into mass and applied to the corresponding position of the structure.Finally,modal analysis was carried out on the model to obtain the structural vibration characteristics.(3)The linear filter AR model was used to compile MATLAB program for pulsating wind simulation,and then the simulated wind speed was converted into wind load and applied to the corresponding position of the structure.Finally,ABAQUS was used for time history analysis to obtain the displacement time history of the structure.After processing,the displacement wind vibration coefficient of the structure was obtained.