Loading...
| Friend's email | |
| Your name | |
| Your email | |
| enter code | |
This page was sent successfuly
- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53572 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Afshin, Hossein; Farhanieh, Bijan
- Abstract:
- Helium is a valuable substance that is widely used in industry and medicine because of its unique properties. Due to the increasing demand for helium in the global market, several helium extraction units have been launched in the world in recent years; Nevertheless, there is still a significant gap between projected global helium production capacity and demand. Today, natural gas is known as the main source of helium on the earth. The method of industrial extraction of helium from natural gas is cryogenic. Due to the low temperature of this process, relatively high power consumption is used to extract helium from natural gas. Therefore, the optimization of this process is of great importance.In this research, the design and optimization of the heat transfer system of a helium extraction cycle from natural gas have been investigated. By designing an integrated heat transfer network, the need for hot utility flow required by the distillation columns is eliminated. Also, two refrigeration cycles are designed to provide the cooling load of the condenser of the distillation columns. By examining the basic parameters of the refrigeration cycles, the suitable working conditions of these processes along with the optimal working points of the equipment have been obtained. To obtain the optimal working point of the utility cycles, a PSO optimization method has been developed and its performance has been compared with the genetic optimization algorithm of MATLAB software. The optimization results show better performance of the developed PSO algorithm in computational time and approaching the absolute minimum point, compared to MATLAB genetic algorithm. The optimization of the utility cycles has led to a reduction of 7.05% and 17.52% of the power consumption of the first and second utility cycles, compared to the basic state. Using a network of heat exchangers and by adjusting the target temperature of the output flows, the need for external cold utility flow has been eliminated. To investigate the potential for improving the performance of the heat exchangers network, the effect of using multi-stream heat exchangers and the integration point of distillation column's bottom flows have been investigated. The results show that the use of multi-stream heat exchangers and the integration of distillation column's bottom flows in between of heat exchangers, in addition to reducing the number of heat exchangers and network complexity, leads to a reduction of 10.73% in the required heat transfer area relative to the base state
- Keywords:
- Helium Gas ; Heat Integration ; Low Temperature ; Process Engineering ; Process Optimization ; Optimization ; Helium Extraction from Natural Gas ; Distillation Column
Digital Object List-
محتواي کتاب - view
Bookmark