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It has the capability to process imported high-sulfur crude oil. \"Report: The atmospheric tower of the 2.2 million tons/year atmospheric distillation unit has been heated to 320°C, and the conditions for switching feedstocks are now met.\" Please coordinate the feed switching at the tank farm. ”“At normal pressure, the tank area has begun supplying raw materials; ensure proper control of the feed rate to enable a smooth transition. ” Recently, with the switch to alternative feed sources, the upgrading and renovation project for Yulin Refinery’s 2.2 million tons per year atmospheric distillation unit and its associated facilities was completed, and the unit was successfully brought online in its operational mode from the first attempt. This project aims to meet the needs of Yulin Refinery for processing imported crude oil by carrying out adaptive modifications to the existing 1.5 million tons per year atmospheric distillation unit, thereby further improving its technical capabilities and enabling it to process Russian ESPO crude oil; it can process 1.5 million tons of imported crude oil per year. For this renovation, the equipment and pipelines within the unit have been designed for high-sulfur acidic crude oil (sulfur content ≥1w%, acid value <0.5mgKOH/g). Among them, the atmospheric and vacuum distillation unit performs a preliminary separation of crude oil, producing mainly reforming feedstock (naphtha), diesel hydrogenation feedstock (diesel fractions), catalytic cracking feedstock (wax oil, atmospheric residue), and kerosene blending feedstock (vacuum residue), thereby supplying raw materials for subsequent units. To ensure the safe and smooth commissioning of the facility on schedule, Yulin Refinery established a commissioning leadership team, assigned dedicated personnel to oversee the process, and carried out tasks such as \"three inspections and four determinations,\" review of technical documents related to the facility’s operation, safety assessments, fire safety inspections, and employee training. Daily project progress meetings and commencement coordination meetings are held to address various issues that arise during the renovation and construction process. A total of 366 issues related to the \"three inspections and four determinations\" protocol were identified and rectified, and more than 30 sets of technical documents were approved. The facility has officially entered the commissioning phase. Led by the Production Planning Department of Yulin Refinery, with the full cooperation of various specialized teams, the process is advanced in an orderly manner in accordance with the commissioning procedures and scheduled milestones. After switching the feed, in accordance with relevant technical documentation, each shift continued to optimize the operating parameters; intermediate products such as atmospheric naphtha, diesel, and residue have all been successfully analyzed through continuous sampling. It is reported that ESPO crude oil is a mixture of medium-grade crude oil with heavy and high-sulfur crude oils, produced from various oil fields in Russia. Once put into operation, this project effectively improves the adaptability of the atmospheric-pressure units for processing sulfur-containing crude oil, enabling them to handle high-sulfur crude oil. This helps Yulin Refinery to expand its range of raw materials used, thereby improving product quality and economic efficiency. At the same time, it is possible to flexibly choose between normal-pressure or reduced-pressure production modes based on market conditions; once the pressure-reduction section of the facility is put into operation, it will provide a stable supply of raw materials for the kerosene co-processing unit, thereby helping Yanchang Petroleum make better use of its crude oil quota and improve its overall efficiency.