【Haichuan Chemical Salary News】Yanzhi Ethylene’s technical and economic indicators reach their best levels ever

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The technical and economic indicators for ethylene production at Yangzi Petrochemical have reached their best levels ever. The latest production statistics show that as of December 25, the annual output of ethylene at the petrochemical plant’s olefin facility has hit a record high. Since 2018, in the “Competition of Learning from, Exceeding Others” held among the ethylene production units of the group company, Yangzi Ethylene has won a total of 3 red flags and 44 red stars in the first 11 months. Focusing on goals to boost production: On November 15, the new liquefied gas evaporation system for Yangzi Petrochemical’s ethylene plant was put into operation, increasing the processing capacity of liquefied gas by over 10%, and raising the daily ethylene production to more than 2,300 tons. Improving the operational performance of the ethylene plant was one of the main objectives for the Olefins Plant of Yangzi Petrochemical in 2018. To this end, the olefin plant focuses on its goals, conducts scientific evaluations to identify the bottlenecks that prevent the plants from handling higher loads, and formulates optimization measures for each of these issues in order to improve economic performance, particularly ethylene production. To increase ethylene production, the Yangtze Olefins Plant employs various measures to stabilize the suction pressure of the pyrolysis gas compressor, thereby increasing the flow rate of pyrolysis gas and boosting ethylene output. The plant focuses on optimizing and improving the structure and quality of the raw materials used in ethylene cracking. By enhancing the quality of these cracking raw materials and making full use of high-quality ones, it increases the yield of ethylene during the cracking process, thereby boosting ethylene production ； By implementing the new liquefied gas evaporation system project and increasing the amount of liquefied gas fed in, the continuous high production of the ethylene plant was ensured. By optimizing the operation mode of the cracking furnace in the ethylene complex and taking multiple measures, the high-load safe operation of the ethylene complex is maintained. Seeking the optimal operating point to improve performance metrics: While increasing ethylene production, Yangzi Olefins Plant identified the optimal operating point and the balance point for efficiency among ethylene output, production costs, operational load, and the yield of high-value-added products. It promptly optimized and adjusted the structure and quantity of feedstock used in cracking processes in order to enhance these performance metrics. The plant utilizes a near-infrared analysis system for pyrolysis feedstocks and a real-time optimization system for pyrolysis depth to control the outlet temperature of the pyrolyzer, thereby achieving the optimal operating temperature for different feedstocks in various furnace types and ensuring maximum efficiency in terms of input and output. The personnel responsible for the ethylene process regularly analyze samples of the flare gas to monitor changes in the content of high-value materials within it. They conduct statistical analyses of these data and compare them with the values specified in the plant design, thereby optimizing the process operations in a timely manner. This helps to identify and eliminate leaks, resulting in a 60% reduction in the amount of flare gas emitted and minimizing the loss of high-value materials. The ethylene production unit in the olefins plant also organized competitions based on small team-specific indicators; it broke down performance metrics into operational indicators, intensified evaluation processes, and thus motivated the employees to carry out precise operations, as well as encouraging the plant to adopt more proactive approaches to lean management. By optimizing operations and implementing precise procedures among the staff, as well as through lean management of the facilities, the level of management has been improved, resulting in the best ever values for four key technical and economic indicators: the cost per ton of ethylene raw material, the yield of high-value-added ethylene products per month, the loss rate during ethylene processing, and the energy consumption for producing high-value-added ethylene products. Uniting efforts and focusing on both aspects, on this basis, the entire staff at Yangzi Olefins Plant pooled their efforts and, in light of the actual circumstances, focused on implementing the strategy of \"working hard for 40 days to achieve the annual targets\" in terms of safety and environmental management as well as production operation management. By ensuring safety to maintain stable production, and by maintaining stable production to achieve high output, they made every effort to reach the goal of producing 840,000 tons of ethylene per year. In terms of safety and environmental protection, the factory continues to hold comprehensive safety discussions among all employees, remains committed to achieving safety goals, and strengthens oversight of contractors and the direct operations on site. It is necessary to ensure that management is present on site during special times and for special types of operations involving critical equipment and vital areas. In particular, supervision by factory management should be carried out during holidays, as well as in the early morning and late evening when construction takes place in areas that are relatively difficult to monitor. Team leaders from various workshops should also conduct mutual inspections to guarantee that safety oversight on site remains stringent even during holidays. By drawing inferences from one instance, efforts should be made to address the issues identified during the comprehensive safety inspection at the headquarters; inspections should cover aspects such as mindset, management, and technology. For each issue discovered, corresponding solutions should be found. Special attention should be paid to identifying sources of unpleasant odors, with rapid and effective measures taken to deal with them. In terms of production operation management, the plant has increased the amount of high-quality liquefied gas used as cracking feedstock, optimized the structure of these feedstocks, improved the operating mode of the cracking furnaces, and thereby increased the processing capacity. One or two additional methanol removal tanks were put into use to ensure the quality of propylene products and prevent material loss and value degradation ； Maintain the stable operation of the three auxiliary boilers to ensure the company’s steam supply during winter. Carry out effective winter prevention measures to ensure the safe and stable operation of the equipment during winter. (Tao Yan, Zhou Ningsheng)