Elastoplastic Analysis And Light-weight Design Of The Filtration Equipment For Activated Carbon Absorption

In this thesis, finite element method was employed to perform flow field analysis, strength analysis, stability analysis and shakedown analysis for fitration equipment. The main results are listed bellow.(1) CFD analysis was conducted with the software FLUENT to simulate the flow field inside the filtration equipment and the general gas inlet pipe. Both velocity distribution and pressure distribution was obtained. Thus, the design pressure for the filtration equipment was determined which laid the foundation for the strength design of the equipment in the next chapters.(2) Stress analysis with the software was carried out on the filtration equipment with thickness of 8mm as well as 4mm. Strength check was conducted based on stress category approach adopted in the standard JB4732-1995. It is found that the equipment with the thickness of 8mm conform to the strength requirement. But the equipment with the thickness of 4mm dose not meet the requirement. It tuns out that high stress occurs at the connection areas bwteen plates while at other places, the stress is quite low.(3) By performing limit analysis, it is obtained that the maximal plastic limit load of the equipment is 7030Pa and the allowable load is 4686.67Pa, which meets the requirements for equipment strength. It is also found that yielding started from the centers on both sides of the wall plates and then expanded, leading to the plastic collapse of the entire equipment. The wall thickness is a major component that determines the maximal limit load for the equipment structure.(4) To examine the possibility of instability of the equipment under the external pressure, nonlinear buckling analysis was completed. The buckling critical load of the wall is 0.00869 MPa. Comapared with limit load, it is found that in the range from 2mm to 10mm of the wall thickness, the plastic collapse precedes buckling.(5) Shakedown analysis was also completed on the equipment under the alternating loadings of 0-0.0035MPa, it turns out that the equipment is in a shakedown state without plastic fatigue failure. The initial plastic deformation area is small and no inverse plastic deformation is found under the loadings.