The Coking Department of Jingtang Company has successfully developed a crude benzene smart control system recently. The smart process control system based on APC technology is capable of devices fine-tuning and " edge" optimization, achieving the purpose of energy saving, consumption reducing and product quality stability improving.

The Coking Department of Jingtang Company adheres to scientific and technological innovation in spearheading development, and boasts of its cost reducing and efficiency increasing effort with the help of science and technology and has taken projects by storm. Crude benzene is one of the main chemical products of the Coking Operation Department, with annual revenue of more than 200 million yuan. Increasing the recovery rate of crude benzene and reducing the production consumption are important tasks in chemical operation area of the Coking Department. The Crude benzene recovery plant includes gas cooling, crude benzene absorption, oil-rich benzene, wash oil regeneration, and other production processes, which is a complex system of distributed parameters, nonlinear, time-varying, big lag and multivariable coupling. Traditional DCS system, which is mainly composed of single loop PID conventional control strategy faces difficulty in achieving the ideal control effect, as device of production operations still give priority to artificial experience by and large, which poses problems of non-timely operation and mismatch of amplitude adjustment, hence faces issues in overcoming system fluctuations and external disturbances, at the same time causing great fluctuation of key technological indexes of crude benzene devices, poor running stability, and high energy consumption. In order to further improve the automation level of crude benzene device, stabilize product quality, reduce material and energy consumptions, explore potentialities and increase efficiency, the Coking Department forms research team to build final cooling washing benzene system controller, benzene distillation system controller and expert optimized controller based on the characteristics of coarse benzene device production, overcome variables correlation and coupling characteristics in the system, and establish suitable control schemes based on different characteristics of each system, so as to satisfy the overall control demands of the crude benzene distillation device, achieving device fine-tuning and the "edge" optimization, energy saving, consumption reducing and quality improvement.

The crude benzene intelligent control system has been integrated with rich experience in actual production and operation and is conformed to the process characteristics and process control requirements, achieving good results in improving the level of integrated automation, reducing the intensity of production operation and improving the stability of production operation. Since its trial operation in July 2019, it has increased its monthly revenue by an average of 150,000 yuan, with an estimated annual economic benefit of over 1.8 million yuan.