Influence of Thick Plate Bending Process on Material Strength Distribution in Hydrogenation Reactor Shells
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JMEPEG https://doi.org/10.1007/s11665-020-05020-4
Influence of Thick Plate Bending Process on Material Strength Distribution in Hydrogenation Reactor Shells You Li, Zhiping Chen, Peng Jiao, Delin Zhang, Dong Xu, He Ma, and Song Huang (Submitted November 26, 2019; in revised form June 14, 2020) Thick plate bending process (warm bending and tempering) has a profound impact on the material strength distribution (MSD) in hydrogenation reactor shells. To date, few studies have studied the thick plate bending process. In this work, an artificial neural network (ANN) combined with finite element analysis (FEA) was utilized to investigate the impact of thick plate bending on the MSD of reactor shells. First, tensile tests of 0-10% pre-strained 2.25Cr-1Mo-0.25 V specimens were subjected to 390 to 510 °C. The results obtained from this experiment were used to develop ANN with two inputs (temperature and plastic strain) to predict the strength of pre-deformed steel. Subsequently, the plastic strain distribution of reactor shells after warm bending was obtained via FEA. We then inputted the FEA results into well-established ANN to predict the MSD of un-tempered reactor shells. The MSD of an actual tempered reactor shell was measured to study the synergic effect of warm bending and tempering on MSD variation. Results showed that the average absolute relative errors between the proposed ANN and tensile test results were below 4%. The absolute relative errors of the proposed prediction method varied from 0.24 to 7.88%. The proposed method is therefore reliable in the lightweight design of the hydrogenation reactor. Keywords
2.25Cr-1Mo-0.25 V, artificial neural network, high-temperature strength, hydrogenation reactor, manufacturing residual influence, thick plate bending
1. Introduction Thick-walled plate bending hydrogenation reactors made from 2.25Cr-1Mo-0.25 V steel are widely used in coal conversion, chemical processing and petrochemical-refining industry (Ref 1-4). For advanced process efficiency in modern refineries, hydrogenation reactors of growing thicker ring shells are constructed (Ref 5), which requires a complex bending process (Ref 6) and gets rise to manufacturing cost. To this end, the lightweight design of hydrogenation reactors should be developed. And the actual service performance of these reactors should be identified in order to avoid potential reliability risks. For a thick-walled plate bending reactor, the thick plate bending process determines the reactors performance since these manufacturing processes lead to a gap between the metal plate and the actual ring shell. Many previous studies draw much attention to the hot deformation behaviors of metals and alloys but neglect the study of thick plate bending process which comprises of warm bending (650-675 C) and tempering (Ref 7). However, the thick plate bending process plays a significant role in the manufacturing processes of the plate bending reactor and should be investigated deeply.
You Li, Zhiping Chen, Peng Jiao, Delin Zhang, Dong Xu, and He Ma, Instit
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