Fatigue Life Assessment of the Shell Structure of Purified Terephthalic Acid Filter Press

Abstract

The filter press is one of the most important devices in purified terephthalic acid (PTA) refinement, and it is of great significance to ensure the fatigue strength of the structure in operation. In this study, the fatigue life prediction of the shell structure of the PTA filter press was investigated through numerical and experimental methods. Firstly, the accurate stress at the critical area of the stiffener was obtained based on the thermomechanical model and submodel approach proposed. Subsequently, the fatigue life was evaluated by the fatigue strength reduction method and hot spot stress method. Finally, the shell structure is optimized by increasing the size of the axial stiffener and continuous hoop stiffener. The results unveil that both thermal load and outer structure constraints have little effect on the radial displacement and stress amplitude of the shell structure. Through modifying the fatigue design curve of the fatigue strength reduction method, the shell structure of the PTA filter press has 42.0% and 0.3% failure probabilities in the previous and present cyclic pressure conditions. Furthermore, the hoop stiffener plays an important role in reducing radial displacement and stress amplitude, among which three hoop stiffeners exhibit the most satisfactory optimization.

Effects of cavitation jet peening treatment on the residual stress and fatigue properties of SAF2205 cruciform welded joints

“…4 The filter press made of SAF2205 duplex stainless steel is widely used in the purified terephthalic acid industry. 5 Among them, the hub part is composed of dense cruciform welded joints. As the slurry is fed intermittently, the filter press shell structure undergoes significant pressure fluctuations.…”

“…Under cyclic conditions, fatigue is a common failure form of pressurized equipment, and the weld joint is a weak zone for fatigue failure 4 . The filter press made of SAF2205 duplex stainless steel is widely used in the purified terephthalic acid industry 5 . Among them, the hub part is composed of dense cruciform welded joints.…”

Testing and Fatigue Life Assessment of Timber Truck Stanchions

“…Finite element results were compared with experimental vibration tests. Song et al presented research on the fatigue life assessment of the purified terephthalic acid filter press of welded shell structure [17]. The tested pressure was determined by experimental analysis, while the finite element method was used for fatigue life calculations and optimization.…”