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New breakthroughs have been made in the application of process control technology for pentane fines plant in China. The reporter learned from an interview with the light hydrocarbon branch company of Daqing Oilfield Chemical Co., Ltd. on December 20th that the 50,000-ton/year pentane finessing device applied advanced control system for a week to achieve smooth operation. This device is currently the largest pentane fractionation unit in Asia, and it is also the first successful application of advanced control technology in domestic fine separation devices. It is expected that the output of high value-added products will increase by more than 7%, and energy consumption will decrease by 4%.
The advanced control system of Pentylene Fine Separation Unit mainly adopts advanced control technology with multi-variable predictive control as its core, and it is one of the core technologies of the integrated automation system of process industrial enterprises. At present, advanced control technology has formed a relatively mature engineering software product and has been widely used in typical refinery and chemical plants.
The pentane fine separation device is a physical separation device composed of a typical industrial distillation column system. The separated products belong to isomers, and the separation is difficult, and the device has strong production continuity, many interference factors, and large lag. Strong coupling and other process features. Although the pentane fine separation device has already achieved DCS control, the DCS system still focuses on the implementation of univariate and single-loop control, which only plays the role of replacing the conventional automated instruments and has not fully exerted the potential of the DCS system. Due to the raw material conditions, the process characteristics of the distillation process and the limitations of the conventional control systems, the smooth operation and "card edge" control of the pentane fines device are faced with many difficulties.
In order to further improve the stability of the pentane fine separation plant, achieve high production and stable production, and reduce consumption, Daqing Oilfield Chemical Co., Ltd. and Zhejiang China Control Software Technology Co., Ltd. have jointly developed the advanced control system for pentane fines plant. The advanced multivariable robust predictive control software APC-Adcon with independent intellectual property rights, based on the original DCS control system, established an advanced control system that met the technological characteristics of the pentane fine separation device.
The system combines multivariable predictive control, process calculations, and process simulation optimization technologies with the experience and needs of field operators. It defines multi-stage control targets with different weights, effectively overcoming the nonlinearities of mixed pentane distillation processes. The dynamic response is slow and the coupling of variables is strongly coupled, and the coordinated control of the multivariable system in the rectification tower system of the pentane fine device is well achieved.
It is reported that after the advanced control system is put into operation, it will effectively overcome the influence of various interference factors, achieve stable, rapid, and accurate control of the pentane fine distribution device, and at the same time, optimize the adjustment of process parameters to achieve product quality and yield. "control.
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