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首页> 外文会议>Proceedings of the ASME power conference 2009 >DYNAMIC SIMILARITY OF MULTISTAGE COMPRESSOR CONTROL: ANALYSES OF ENERGY UTILIZATION
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DYNAMIC SIMILARITY OF MULTISTAGE COMPRESSOR CONTROL: ANALYSES OF ENERGY UTILIZATION

机译：多级压缩机控制的动态相似性：能源利用分析

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摘要

The balance between safe efficient process control and low instrumentation cost is quite hard to achieve. It was found that design of process control systems plays an important role for achieving the optimum process safety and efficiency beside the minimum required instrumentation costs. This paper is mainly intended to describe a new approach to compressor control aimed principally at achieving increased controllability during start-up which optimizes safety and control of a multistage gas compressor. It highlights the importance of the proper compressor control, introduces some recommendations for compressor control to facilitate the development of optimum process control and also stresses on the factors that improve the safety and efficiency of compressor control for already existed systems. Surge phenomenon causes and effects on compressors were explained together with Universal Performance Curve anti-surge control method and the Minimum Flow Strategy used to compensate for pressure transmitters failure. A detailed study was performed on a specific common problem that occurs in petrochemical plants, gas compressor first stage suction pressure measurement. Conventional solutions were discussed and disadvantages were highlighted. The main contribution of this paper is a novel idea to overcome the problem without affecting either safety or efficiency of operation and absolutely no extra instrumentation cost. A new dimensionless parameter was invented, Ratio of Pressure Ratios. Relation between ratio of pressure ratios and compressor speed is being investigated experimentally and numerically. Experimental results show that there is a relation between ratio of pressure ratios, the results were fitted to second order polynomial trend lines using least squares method. The numerical calculations are compared with experimental data and good agreement is found. The results also suggest direction for further investigations. Ratio of Pressure Ratios method was implemented for a propylene gas compressor turbine train, the results of calculation wererncollected and compared to actual measurements, and it was found that calculation error is less than 1%.
机译：安全高效的过程控制与低仪器成本之间的平衡很难实现。人们发现，过程控制系统的设计对于实现最佳过程安全性和效率以及最低的仪器成本来说，起着重要的作用。本文主要旨在描述一种新的压缩机控制方法，其主要目的是在启动过程中实现更高的可控制性，从而优化多级气体压缩机的安全性和控制。它强调了适当的压缩机控制的重要性，介绍了一些有关压缩机控制的建议，以促进最佳过程控制的发展，并强调了提高现有系统压缩机控制安全性和效率的因素。解释了喘振现象的原因和影响，以及通用性能曲线的反喘振控制方法和用于补偿压力变送器故障的最小流量策略。针对发生在石化工厂中的一个特定的常见问题进行了详细的研究，即气体压缩机第一级吸入压力的测量。讨论了常规解决方案，并指出了缺点。本文的主要贡献是在不影响安全性或操作效率且绝对没有额外仪器成本的情况下克服该问题的新颖思路。发明了一种新的无量纲参数，即压力比。压力比之比与压缩机转速之间的关系正在通过实验和数值研究。实验结果表明，压力比之间存在一定的关系，采用最小二乘法将结果拟合到二阶多项式趋势线上。将数值计算与实验数据进行比较，发现吻合良好。结果也为进一步研究提供了方向。对丙烯气体压缩机汽轮机组采用了“压力比”方法，收集了计算结果，并与实际测量结果进行了比较，发现计算误差小于1％。

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