On May 1st, Xi'an Petrochemical's hydrogen production plant that had been quiet for 6 years resumed the rumble of material operation on the spot. After a rain, the green grass and safflower lining on the edge of the installation area was renewed. At 8:00 on May 2, the device successfully produced diesel products that meet the national III standard, and the device was successfully driven at one time. The 300,000-ton/year diesel hydrorefining unit and the 4000Nm3/h hydrogen production unit have been in shutdown since their maintenance in April 2005. Earlier this year, in order to reduce the sulfur and nitrogen contents in diesel and gasoline, and in conjunction with the implementation of the oil quality upgrade project, Xi'an Petrochemical confirmed that the additional hydrogen production unit will be started again. To prepare for the commencement of work, Xi'an Petrochemical has newly established a second joint workshop, built and established the system, trained personnel, and was familiar with the site. The technicians' organization, the director and the former “old†staff trained the technical principles, process flow, etc., and sent 29 people to Qingjiang Petrochemical to conduct a 40-day hydrogen addition system training to master the device opening and stopping procedures, process operations, and accidents. Emergency treatment. Due to the prolonged decommissioning of the device, although the internal anti-corrosion measures for the hydrogenation reaction and the high-pressure part have a good effect, the corrosion of the pipeline with insulation is quite serious, and the replacement of bolts alone has reached more than 3,000 sets. During the maintenance phase, the company completed a total of 270 nitrogen gas lines for hydrogenation of hydrogen from diesel fuel, 207 inspection lines, 51 pressure vessels, 42 safety valves, and 3 maintenance heating furnaces. The acid water effluent renovation project was completed. Large compressors, small to specific regulating valves, and hand valves, check statistics one by one and update them. Strictly inspect the water, electricity, gas and fuel gas systems, check the disassembly and assembly of the blind plates and the opening and closing of the valves, strictly check the leakage point of the airtight test, the maintenance of the maintenance, the maintenance of the maintenance, and clean up the trenches and body clearances. In addition to routine inspections and maintenance, the workshop also carried out reforms of the hydrogen cycle line, naphtha dewatering system, feed line, steam pipe network, etc. for the actual operation of the previous cycle. On March 31, the device was overhauled and entered the start-up phase after acceptance. The nature of the installation determines that the start-up time lasts long. During the start-up process, the second joint workshop strictly implements the confirmation table and work order system. The catalysts of four reactors were loaded one after another, the purge and airtight tests of the devices were completed, and the catalysts were reduced and presulfided. On April 29, hydrogen was produced by hydrogen production, and the hydrogenation system for diesel hydrogenation was boosted and hermetically sealed. On the 1st of May, the reaction system was fed at 24 o'clock and the device passed the inspection at 8 o'clock on May 2nd. After the success of the hydrogen-generating plant, it not only satisfied the demand for the National III diesel oil in the northwest region, but also laid the foundation for the smooth start-up of gasoline hydrogenation, catalytic reforming and aromatics extraction facilities in the second half of the year.
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