In the early morning of April 24, Qilu Petrochemical Shengli Refinery suddenly shone in the sky, reflecting half of the sky red.
Source: Hydrogen Energy Hui
Then Sinopec Qilu Petrochemical released a brief statement: continuous reform workshop compressor area hydrogen leaked and caught fire at 0:02, 318 minutes later, the hydrogen process , 1 hour later, at 1:20, open flame was extinguished, fortunately no casualties.
On January 6, early 2022, Yu Zishuo, who had just joined the continuous reorganization workshop of Qilu Petrochemical Victory Refinery, had only been newly hired for half a year and was awarded by the leader of the high th floor of Qilu Petrochemical Company, successfully avoiding an accident. Because on the morning of December 30, 2021, Yu Zishuo was inspecting the equipment when the hydrogen sulfide alarm device he carried with him suddenly issued an alarm. Then a smell of rotten egg came. He quickly evacuated the scene and reported it to the squad leader as soon as possible. Then, they returned to the leak point according to the procedures to avoid poisoning or fire and explosion accidents.
Yu Zishuo received a commendation order (Source: China News Network)
In external publicity, Qilu Petrochemical also emphasized that " operating profit exceeds 5 billion to hit the best level in history" is inseparable from the security management and management behind it. is the word strict and the word fine first. It is the ballast for Qilu Petrochemical to achieve the "acceleration" of efficiency, and it also emphasizes that "the safe and stable operation of the device is the greatest benefit of the enterprise ".
(Source: China News Service)
But even if safety is so important, the accident still happened. We might as well learn about the continuous reforming and hydrocracking device that happened. But the child has no mother, so he talks a long way to say it. You need patience to finish reading.
Construction process
Qilu Petrochemical Shengli Oil Refinery has been processing Shengli crude oil and island crude oil since its establishment in 1966 to 1996, and basically belongs to a "fuel-type" refinery. With the completion and production of the Qilu 300kt/a ethylene project in 1987, to provide cracking raw materials for the production of ethylene , Shengli Refinery gradually evolved into a "fuel-chemical" oil refinery. In order to improve the yield of light oil and provide more high-quality cracking raw materials for ethylene production, since 1996, light crude oil such as the Middle East has been purchased for blending. However, due to the small amount of imported crude oil, it is far from solving the contradiction between improving the light oil yield of the entire plant and meeting the high-quality cracking materials for ethylene engineering.
On October 30, 1997, the feasibility study report on the refining and expansion project of Qilu Petrochemical Company's Shengli Refinery was evaluated and approved by China International Engineering Consulting Company commissioned by the State Planning Commission, and reported to the State Planning Commission, which marked the completion of the preliminary preparations for the refining and expansion project of Qilu Petrochemical Company. The refining and expansion project is one of the four major renovation projects (refining, ethylene, fertilizer, and caustic soda) of Qilu Petrochemical Company during the "Ninth Five-Year Plan" period. The investment in the feasibility report is estimated to be nearly 3.6 billion yuan. The estimated subsequent project is 3.172 billion yuan, and the project covers an area of 125,800 square meters.
renovation and expansion projects include: "two constructions, five reforms and one supporting facilities", namely, newly built 600,000 tons/year continuous reforming device, 1.4 million tons/year hydrocracking device , renovating and expanding VRDS device, No. 3 normal pressure distillation device, No. 2 sulfur recycling device, No. 1 hydrogen production device, No. 2 hydrogen refining device, No. 2 hydrogen refining device, and oil storage and transportation, public systems and other supporting projects. The actual investment of the renovation and expansion project was 3 billion yuan, and it took nearly 4 years to complete it.In accordance with the requirements of Sinopec Corporation's "less investment, high output, timely investment and rapid output", the renovation and expansion project is divided into three stages:
① From July 1997 to October 1998, , 3 normal pressure reduction device No. 3 and 3 50,000 cubic meters crude oil tanks in the west of the imported crude oil tank area, some oil storage and transportation, loading and system supporting work, with the No. 3 normal pressure distillation device as the core;
② From November 1998 to December 1999, , 3 VRDS devices, No. 1 hydrogen production device, No. 2 hydrogen refueling device, 3 50,000 cubic meters crude oil tanks in the east of the imported crude oil tank area, No. 2 torch 1 10,000 cubic meters of gas cabinet , and supporting projects of the North District water supply and drainage system and railway transportation system;
③ From March 1998 to November 2000, the demolition and construction of No. 2 sulfur device, new continuous reforming and hydrocracking joint device and its system supporting pipelines, medium-pressure steam pipelines, No. 2 torch facilities, nitrogen supply facilities, reforming and expansion of hydrogenation raw material tank areas and other tank areas, as well as the renovation and renovation of circulating water and purifying water treatment facilities. The main focus is on the newly built continuous reforming and hydrocracking device. The device achieved intermediate handover on November 23, 2000, and produced qualified products at 7:00 on March 5, 2001.
continuous reforming device
uses the second generation of French IFP ultra-low voltage continuous reforming technology, only patent use rights are purchased, Petrochemical Science Research Institute provides basic data, China Petroleum and Chemical Engineering Science Beijing Design Institute conducts basic design and detailed engineering design, and domestic engineering construction is carried out. The continuous regeneration of catalyst uses domestic equipment, and the regeneration system control part has been improved on the basis of the digestion and absorption introduction device.
through three processes of raw material pretreatment, reforming reaction and catalyst continuous regeneration, the low octane number naphtha is turned into an aromatic high octane gasoline component. The raw materials used in the device are various hydrogenated naphtha fractions and direct distillation naphtha from Middle East crude oil. The products are high octane number lead-free gasoline components, hydrogen and C6+ components. Some of the C6+ components are extracted by the reforming device to produce light and heavy reforming liquids, and are supplied to the olefin factory as chemical raw materials.
continuous reforming device process flow chart
hydrocracking device
After repeated comparison and selection, the 3936-3824 second-stage 3936-3824 developed by Fushun Petrochemical Research Institute was selected for one-time hydrocracking process technology and catalyst (changed to 3936 and ZHC-01 after the catalyst configuration scheme was changed to 3936 and ZHC-01). The hydrogen purification adopts the pressure-switching adsorption (PSA) process developed by Chengdu West China.
raw materials are sand light, sand middle, Kuwait VGO (the ratio of the three is 46:8:46) and coking wax oil. The hydrogen used is hydrogen with a purity of 99.9% after purifying by pressure-switching adsorption (PSA). The main products are liquefied gas, naphtha, aviation coal, diesel and tail oil. Among them, aviation coal is a high-quality jet fuel, and the tail oil is supplied to Qilu 450kt/a ethylene project as a high-quality cracking raw material to extend the operation cycle of the cracking furnace and increase the company's economic benefits. After the accident, Shengli Refinery urgently stopped the continuous reforming device and hydrocracking device, and cut off the hydrogen process. Although it was cut off, the hydrogen remaining in the pipeline adopted protective combustion measures. As for which part of the hydrogen leakage caused the flash explosion and to catch fire, further investigation and analysis are still needed.
Source: Hydrogen Energy Conservation
But safety is no small matter. Even if you pay attention to it in daily life, there may still be hidden dangers. Therefore, safety work must be done in detail and then in detail. After all, " is not safe, everything is zero in ".
Qilu Petrochemical Victory Refinery Night Scene (Author: Liu Yuping)
