جستجوی مقالات مرتبط با کلیدواژه « process simulation » در نشریات گروه « علوم پایه »

Large-scale use of hydrogen requires precise risk control, which can be achieved through investing in a reliable risk analysis method. In the present study, to investigate the hazards caused by hydrogen with high pressure and temperature in the sorbitol production plant, the concept hazard analysis method and the qualitative risk analysis were used to identify the main hazards in this plant. Then PHAST 8.22 software was used to model the consequences of high-risk scenarios. Moreover, the risk assessment data of the International Association of Oil and Gas Producers was used to estimate the frequency of scenarios. The event tree analysis was used to estimate the frequency of the consequences of the defined scenarios. Finally, the vulnerable areas were recognized, and the number of casualties in the event of any of these consequences was estimated. Using the frequency vs. number of fatality (F-N) curve based on the risk acceptance criteria for hydrogen document, areas with unacceptable risk were identified. According to this diagram, the risk of the reactor and the compressor are in an unacceptable area. Therefore, the necessary measures in terms of structure, performance, or organization should be prioritized to reduce the risk associated with this two equipment.

In this work, adsorptive separation of propane/ propylene mixture using Cu-MOF-74 metal-organic framework was studied. For this, a fixed-bed adsorption column was designed and constructed to investigate the performance of the synthesized adsorbate under continuous flow condition. Then, the adsorption and desorption of propane/ propylene mixture (25/75) at 303 K and 3 bar was experimentally measured. By using Aspen Adsorption™ software and employing experimental isotherm data of propane and propylene, the separation process in the fixed-bed adsorber was simulated. After validation of simulation results by using experimental breakthrough curves, vacuum pressure swing adsorption (VPSA) process was simulated in order to estimate the important parameters such as product purity, recovery and productivity. Obtained results show that the software could predict the experimental data with the high accuracy and capability. Moreover, by using Cu-MOF-74 it is possible to separate propylene from propane with productivity of 2.36 mol/kg.h and propylene purity up to 99.5%.

The emission of greenhouse gases, especially aromatic compounds, is a major challenge in the gas industry. In the dehydration process, glycol solvents are used to eliminate water content from the natural gas stream. Farashband gas processing plant consists of six dehydration units that operate by application of stripping gas injection. In this study, the application of Drizo process instead of the conventional process for solvent regeneration is investigated and in order to reduce the BTEX emission and decrease the solvent cost, the use of BTEX absorbed components from the gas stream as a regenerative solvent is suggested. Achieved results indicated that the application of Drizo process decreases the harmful environmental effects and improves the main operating parameters such as dewpoint of dry natural gas, glycol loss, and glycol purity. Also, according to simulation results, by application of Drizo process, the dewpoint of dry natural gas in the summer operating condition reduces from -25 ℃  to -29 ℃  and the glycol loss decreases from 3 kg/h to 2.5 kg/h.