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New Progress on Yulin Chemical’s 3×100,000 Nm3/h Air Separation Project Author/Source: Gas Separation Date: 2020-08-25 Clicks: 13 From August 1 to 17, the installation of the column inside the first cryogenic tank of the air separation unit at Yulin Chemical’s air separation and thermal power project department, owned by Shaanxi Coal Group, was completed, 8 days ahead of schedule. At present, all the assembly and welding work on the distillation tower inside the air separation cryogenic tank has been completed. The verticality of the tower, weld inspections, and surface quality all meet or exceed the standard requirements. The distillation column in the air separation cryogenic tank is the core equipment of an air separation plant, and its main function is to separate components such as oxygen, nitrogen, and argon in air. The main cooling tank of this equipment is 60.9 meters tall; the three tanks were delivered to the site in five sections and welded together in the air. This equipment is made of a special material, and it has strict requirements regarding temperature, humidity, levelness, welding quality, and cleanliness. Its installation requires close cooperation between heavy-lifting companies and the installation teams, making on-site construction quite challenging. To ensure the smooth completion of on-site installation, the Yulin Chemical Air Separation Heat and Power Project Team planned in advance. In mid-July, they invited Linde to provide technical guidance on the lifting and welding of the towers, formulated a plan for the installation and welding of these towers, reviewed the installation procedures and testing plans. They also assigned personnel to inspect on-site the setup of scaffolding, night lighting, and labor protection measures. They kept an eye on weather conditions in advance and implemented measures to prevent fires, wind damage, and rain, as well as ensured that all necessary materials were available, thus making comprehensive preparations for the assembly and welding of the towers. Next, the project will complete the pipeline installation inside the cold box by November. The completion of the installation of the distillation column in the first cryogenic tank for air separation marks the full commencement of all activities related to the air separation and thermal power project at Yulin Chemical. This lays a solid foundation for the company to develop a high-quality demonstration project for the production of new chemical materials through the selective utilization of coal, thereby helping to achieve the \"21630\" goals set for project construction. The construction of the air separation unit supporting the first phase of the Shaanxi Coal Yulin Chemical’s demonstration project for the selective utilization of coal to produce new chemical materials, which involves an annual production capacity of 1.8 million tons of ethylene glycol, includes air separation equipment with an oxygen production capacity of 3×100,000 Nm3/h, a shared 5,000 m3 liquid nitrogen backup system, a 3,000 m3 liquid oxygen backup system, and a vaporization system. It supplies high-pressure and low-pressure oxygen products with a purity of ≥99.60% for the production of subsequent process units such as project gasification, medium-pressure and low-pressure nitrogen with a purity of ≥99.99%, as well as low-pressure nitrogen products with a purity of ≥99.60%. Additionally, it provides medium such as instrument air and plant air to support the plant’s utility systems. On May 13, 2019, Yulin Chemical Company of Shaanxi Coal Group entered into a formal contract with Linde Engineering for the air separation unit required for the 1.8 million tons per year coal-to-ethylene glycol project; the contract covered the design, supply, and maintenance of 3 ultra-large-scale air separation units with a capacity of 100,000 Nm3/h each. The scope of the contract includes: the technical design of the plant process package and the basic engineering design, the detailed engineering design of the cryogenic tank system, the supply of complete sets of process equipment, as well as technical services such as installation and commissioning.