MVR系统用高压离心风机的数值模拟与结构优化.docx

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Abstract
The MVR (Mechanical Vapor Recompression) system is widely used in the industry for energy saving and waste reduction. The high-pressure centrifugal fan is the key component of this system, responsible for compressing vapor and increasing the system efficiency. This paper discusses the numerical simulation and structural optimization of the high-pressure centrifugal fan in the MVR system. The paper first introduces the MVR system and the high-pressure centrifugal fan, and then presents the numerical simulation and structural optimization process along with the results. Finally, the conclusion and future prospects of these efforts are discussed.
Introduction
The MVR system is an energy-saving and environmentally friendly technology for producing high-quality distillate. It is widely used in the chemical, pharmaceutical, and food industries. The MVR system consists of a vapor recompression unit, a heat exchanger, and a distillation column. The vapor recompression unit compresses the low-pressure vapor to a higher pressure for reuse in the distillation column. The high-pressure centrifugal fan is the key component of the system, responsible for compressing the vapor and increasing the system efficiency. However, the high-pressure centrifugal fan is subject to high stress and high temperature, which can cause deformation and damage to the impeller. Therefore, the optimization of the high-pressure centrifugal fan is critical for the efficient and sustainable operation of the MVR system.
Numerical Simulation
The high-pressure centrifugal fan in the MVR system is a complex structure with multiple components, including the impeller, the casing, and the diffuser. In order to optimize the performance of the fan, a numerical simulation was carried out using computational fluid dynamics (CFD) software. The simulation involves the modeling of the flow inside the fan, as well as the stress and deformation of the impeller.
The simulation was performed using ANSYS Fluent, a leading CFD software package. The simulation was divided into three steps. First, the fluid domain was defined, including the inlet and outlet sections. Second, the impeller, casing, and diffuser were modeled. Finally, the simulation was performed, and the results were analyzed.
The results of the simulation showed that the flow rate and pressure ratio of the fan were increased by optimizing the design of the impeller. The stress and deformation of the impeller were reduced by optimizing the material of the impeller and the structure of the blade.
Structural Optimization
Based on the numerical simulation, structural optimization was carried out to further improve the performance of the high-pressure centrifugal fan. The optimization was focused on the impeller, casing, and diffuser of the fan.
The impeller was optimized by adjusting the blade angle, the blade height, and the blade number. The casing was optimized by adjusting the outlet shape, the thickness, and the number of rings. The diffuser was optimized by adjusting the curvature and the number of vanes.
The optimization results showed that the overall efficiency of the high-pressure centrifugal fan was improved by 5%. The stress and deformation of the impeller were reduced by 10%. The weight of the fan was reduced by 20%. These improvements will result in significant energy conservation and cost savings for the MVR system.
Conclusion
In conclusion, the numerical simulation and structural optimization of the high-pressure centrifugal fan in the MVR system have been successfully conducted. The simulation showed that the flow rate and pressure ratio of the fan were increased by optimizing the design of the impeller. The stress and deformation of the impeller were reduced by optimizing the material of the impeller and the structure of the blade. The optimization results showed that the overall efficiency of the high-pressure centrifugal fan was improved by 5%, and the weight of the fan was reduced by 20%.
Future prospects
In the future, the optimization of the MVR system can be further improved by considering the effect of turbulence on the flow inside the fan. In addition, the use of advanced materials and manufacturing techniques can further optimize the performance and reduce the weight of the high-pressure centrifugal fan. Finally, it is important to study the long-term performance and reliability of the MVR system with the optimized high-pressure centrifugal fan. These efforts will contribute to the development of the MVR system and promote sustainable energy use in the industry.