离心式压缩机防喘振控制系统的实现

发布时间：2018-06-19 23:32

本文选题：透平压缩机 + ITCC　；参考：《华东理工大学》2012年硕士论文

【摘要】：当今,离心式压缩机是在石油化工和天然气输送等企业部门得到广泛应用的关键设备之一。因此,离心式压缩机的安全运行极其重要,但是离心式压缩机的喘振是影响此指标的极大危害因素。所以,为了保证压缩机能够安全运转,对离心式压缩机进行防喘振控制非常重要。本文针对离心式压缩机易发生喘振现象,利用ITCC防喘振技术来判断是否发生喘振。通过防喘振控制器的输出来控制回流阀的开度,通过控制回流阀的开度的大小使工艺过程保持稳定状态。本文也针对原有制造商提供的绝对参数性能曲线不能反映进出口气体条件的变化对进口流量的影响这个问题,运用相似化原理对压缩机参数进行相似化处理,利用相似性原理,将压缩机的性能曲线转化成不受进气状态影响的通用性能曲线。转换后的通用性能曲线形状类似于原始曲线。因此,转化后的喘振点的变化轨迹大致也是一条二次抛物线。这样就可以确定一条与喘振界线平行的防喘振控制线,来控制防喘振阀的开启。从而保证压缩机流量大于正常工作时的最小流量,避免了压缩机发生喘振,实现了喘振线PID控制。在本系统中,采用TRICONEX公司生产的TRICON三重冗余容错结构的控制器作为下位控制系统。论文将修正后的性能曲线嵌入至(?)TRICONEX的ITCC中的防喘振模块中进行应用,实现了对丙烯制冷压缩机的防喘振控制。
[Abstract]:Nowadays, centrifugal compressor is one of the key equipments widely used in petrochemical and natural gas transportation enterprises. Therefore, the safe operation of centrifugal compressor is extremely important, but the surge of centrifugal compressor is the most harmful factor affecting this index. Therefore, in order to ensure the compressor can run safely, anti-surge control of centrifugal compressor is very important. Aiming at the surge phenomenon of centrifugal compressor, this paper uses ITCC anti-surge technology to judge whether surge occurs or not. The opening of backflow valve is controlled by output of anti-surge controller, and the process is kept stable by controlling the opening of backflow valve. This paper also aims at the problem that the absolute parameter performance curve provided by the original manufacturer can not reflect the influence of the change of import and export gas condition on the inlet flow rate. The similarity principle is used to treat the compressor parameters, and the similarity principle is used to treat the compressor parameters. The compressor performance curve is transformed into a general performance curve which is not affected by the intake state. The converted general performance curve is similar in shape to the original curve. Therefore, the trajectory of the transformed surge point is approximately a quadratic parabola. Thus, an anti-surge control line parallel to the surge line can be determined to control the opening of the anti-surge valve. Thus, the compressor flow rate is larger than the minimum flow rate in normal operation, the compressor surge is avoided, and the surge line pid control is realized. In this system, the triple redundancy fault-tolerant structure of Tricon produced by TRICONEX is used as the lower control system. In this paper, the modified performance curve is embedded in the anti-surge module of TRICONEX ITCC, and the anti-surge control of propylene refrigeration compressor is realized.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH452

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