The mechanical completion of the air separation unit for the China Coal Yulin Coal Deep Processing Base project has been achieved
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On December 17, 2025, the mechanical completion of the air separation unit for the China Coal Yulin Coal Deep Processing Base project, which was overseen by China National Chemical Engineering Corporation Hualu, was achieved. The China Coal Yulin project is the first coal chemical project approved by the Ministry of Ecology and Environment since the introduction of China’s \"3060\" dual-carbon strategy goals; it holds great significance for promoting the clean and efficient use of coal and ensuring energy security. As of now, the overall progress of the second phase of the coal chemical project at China Coal Shaanxi Company has exceeded 71%; 81% of the main process equipment has been installed, and 76% of the process pipelines have been constructed. Currently, the CNPC Shaanxi Company’s CNPC Yulin Coal Deep Processing Base project has entered a critical phase in the fourth quarter. Adjust the construction pace flexibly to accommodate the special conditions of winter construction. By adopting the strategy of \"phased parallel execution and simultaneous progress at multiple sites\", several key tasks were completed ahead of schedule: the installation of the three cryogenic tanks for the air separation unit was finished 3.5 months earlier than scheduled ； The reactors and regenerators of the DMTO unit were capped 17 days ahead of schedule ； The EVA facility’s power distribution room and cabinet area have been successfully capped ； 73 large-scale pieces of equipment have been lifted into place, 72 of them ； Compressed air and factory ventilation systems have successfully achieved full connectivity across all pipeline corridors ； The welding volume for process pipelines exceeds 75% ； The air separation unit and sulfur recovery unit have reached mechanical completion, while five other facilities – the temporary storage facility for high-concentration brine, the first heat exchange station, the expansion and renovation of the plant’s railway system, and the 110kV substations for air separation and chemical processing – have been handed over. Technological innovations have helped overcome the limitations posed by low temperatures; modular prefabrication and automated welding techniques have been adopted. 96 automatic groove cutters and 40 automatic welding machines have been put into use, and more than 900 certified welders have been selected. Since November, the average daily welding volume has reached 24,000 dynes, with a first-pass welding success rate of 98.63%. The welding success rate for high-pressure, thick-walled pipes in the methanol synthesis unit is as high as 99.5%. A specialized plan for winter construction was developed; anti-freezing inspections were carried out in advance on 412 pieces of equipment and pipelines. Insulation shelters were installed around outdoor equipment, and welding materials were stored at a constant temperature. Special welding techniques were employed, and proper insulation measures were taken promptly during the final stages of civil work to ensure a solid foundation for winter construction.
The project progress is as follows: On November 22, 2025, the main structure of the substation supporting the LDPE/EVA plant in the 250,000 tons per year EVA chain extension and enhancement project undertaken by Global Daqing Company for China Coal Shaanxi Company was successfully completed, 8 days ahead of schedule. On October 13, 2025, the upper cover of the fourth section of the reactor in the DMTO plant of China Coal Yulin Coal Deep Processing Base project, along with the cyclone module, were successfully installed, with completion taking place 17 days earlier than planned. The DMTO reactor plays a key role in efficiently converting methanol into low-carbon olefins such as ethylene and propylene, and it serves as the \"core production unit\" of the 2.35 million tons per year methanol-to-olefins plant. The reactor of the third-generation DMTO unit is equipped with three sets of cyclone systems in total, comprising 36 cyclone separators. In September 2025, the No. 2 propylene distillation tower, the largest single unit of the Coal Deep Processing Base project in Yulin built under the EPC contract by Sinopec Guangzhou Engineering Co., Ltd., was hoisted into place. This unit has an annual processing capacity of 900,000 tons for olefin separation. As of August 2025, the overall progress of the second phase of the coal chemical project exceeded 45.5%, with the installation of the main plant equipment in full swing. The progress of each process is as follows: all 3 cold boxes of the air separation unit have been capped. The construction of the 84-meter layer of the gasification framework for the gasification unit has been completed, and the 4 units of the world’s first 3,000-ton-class water-coal slurry gasification semi-waste boiler have been installed in place. The methanol scrubber for 1,200 tons of purified syngas in the purification unit has been lifted into place. The air-cooled motors for the methanol synthesis unit have been installed, and the syngas compressor and turbine have been lifted into place. The three-spin framework of the reactor in the DMTO plant has been completed, and the concrete core structure of the chimney has been topped out. The casting of the compressor main structure for the olefin separation unit is complete ； The first gas-phase reactor in the polypropylene plant, along with the separator liquid ethylene stripping tower and hydrogen scrubbing tower, have been hoisted into place. Meanwhile, the bidding for both the main units and auxiliary units has been completed, and the detailed design as well as the procurement of long-cycle equipment are proceeding as planned. In June 2025, the No. 1 SBR biological tank of the wastewater treatment plant for the water treatment project at the China Coal Yulin Coal Deep Processing Base, which was constructed by Wuhuan Company as the general contractor, was successfully completed in accordance with the project’s established plans and relevant standard requirements. The No. 1 SBR biological tank covers an area of 7,890 square meters, with walls that are 8 meters high and an effective volume of 55,080 cubic meters. It is the tank with the largest volume in this water treatment project, and its timely and successful completion of construction laid a solid foundation for the project to be delivered on schedule. On May 24, 2025, in the High-Tech Industrial Park of Yulin City, Shaanxi Province, the first 1,200-ton shift gas scrubber for the CMCC Yulin Coal Deep Processing Base project, manufactured by Lanxi Heavy Equipment, was completed and delivered. In April 2025, the high-concentration brine temporary storage tank for the water treatment project of the China Coal Yulin Coal Deep Processing Base, which was contracted out by China Wuhuan Engineering Co., Ltd. affiliated to Sinochem, was successfully completed. The designed effective volume of the high-concentration brine temporary storage tank is 20,000 m³, equivalent to the volume of 10 standard swimming pools. The successful completion of this single structure lays a solid foundation for the completion of the project’s water treatment works by the end of the month. In December 2024, the main structure of the cabinet room for the methanol purification unit was completed 6 days ahead of schedule. At present, the construction of the gasification framework on the project’s critical path has reached the eighth floor; over 86% of the pile foundations throughout the site have been installed, and the main structure of the primary underground pipes has also been completed. The overall progress of the project is approximately 20%. On September 10, 2024, the groundbreaking ceremony was held for the water treatment facility of the China Coal Yulin Coal Deep Processing Base project, which is part of China Coal Shaanxi Energy and Chemical Group Co., Ltd. On June 18, 2024, the commissioning ceremony for the main facility of the China National Coal Group’s Yulin Coal Deep Processing Base project in Shaanxi was held.
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