模糊理論在壓縮機防喘振中的應用與研究
[Abstract]:In chemical production, centrifugal compressor has always been an indispensable mechanical equipment for pneumatic conveying because of its compact structure and high speed. With the development of domestic chemical industry in the direction of large output and high intelligence in recent years, The application of centrifugal compressor has been popularized. However, as an inherent characteristic of centrifugal compressor, surge restricts the development of centrifugal compressor. Surge is a kind of huge vibration caused by strong air separation between impeller and diffuser when compressor works in a small flow state, which will cause great harm to compressor unit. The traditional PID controller has some limitations in surge control of compressor. Its performance depends on the setting of parameters, and there is a contradiction between rapidity and overshoot. In this paper, a two-dimensional fuzzy controller is constructed by using the concept of fuzzy control, the deviation between input and setting quantity and the change rate of deviation, and a new control method is proposed. Based on the analysis of the operation status of C dilute compressor in methanol section of Shanghai Coking Plant, based on the safety and reliability of centrifugal compressor operation, the mathematical model is deduced according to the performance curve of the compressor. The fuzzy controller against surge is designed by using fuzzy control method, and the system is simulated by Simulink software package in Matlab. The results show that fuzzy control can better solve the surge problem. The ultimate purpose of this scheme is to verify that the fuzzy controller can free the compressor from the danger of surge through experiments. By comparing the inlet flow rate with the opening of the backflow valve in the simulation results, the designed fuzzy controller meets the control requirements. The purpose of preventing surge is achieved.
【學位授予單位】:上海交通大學
【學位級別】:碩士
【學位授予年份】:2011
【分類號】:TH452
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