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Progress on the Technical Renovation Project for 39,000 Nm3/h Air Separation Unit at Zhejiang Jinju Chemical Industry Author/Source: Huahua Network – Coal Chemicals Date: 2020-08-05 Clicks: 68 At 22:25 on July 27th, with the last batch of 18 m3 of C30 ready-mixed concrete being poured into the formwork for the large-volume concrete foundation of the distillation system’s cold box, the pouring of nearly 1,100 m3 of concrete for the entire cold box foundation as part of the technical renovation project for 39,000 Nm3/h air separation unit at Zhejiang Jinju Chemical Industry, which is under the general contracting of Donghua Technology, was successfully completed. The maximum thickness of the cold storage foundation is 3.4 m. A 2 mm thick stainless steel waterproof layer is welded in the middle of the foundation, and it is secured in place using 144 bolts; additionally, 178 small cavities are provided. As one of the large-volume concrete foundations for the Jinju air separation project, it presents challenges in terms of construction complexity and high precision requirements, as well as strict demands regarding the concrete’s impermeability and frost resistance. The construction of the entire cold box foundation is carried out in two phases: the first phase involves pouring concrete to a depth of 1.6 meters below the stainless steel water barrier, while the second phase involves pouring concrete to a depth of 1.8 meters above the stainless steel water barrier. The project team on site overcame various difficulties encountered during construction, including excessive excavation of the foundation, pit collapse, leakage during the construction of water barriers, high temperatures during the pouring of large-volume concrete, and the rainy season in Quzhou, and finally completed the construction of the cold box foundation successfully. The completion of the pouring work for the cryogenic tank foundation marks a shift in the focus of construction work on the fractionation unit – the second key process line in the air separation plant – from the civil engineering phase to the installation phase. Zhejiang Jinju Chemical Co., Ltd. was formerly the synthetic ammonia plant of Zhejiang Juhua Co., Ltd. It is a key listed company focused on the production of fertilizers, chemical raw materials, and fine chemical products, and serves as an important fertilizer production base in Zhejiang Province. The air separation technology renovation project includes the air separation unit and circulating water station that support Zhejiang Jinju Chemical Co., Ltd.’s ammonia synthesis feedstock route and energy-saving and emission-reduction technology renovation projects, as well as the associated utility systems and auxiliary facilities; the contract duration is 23 months. Donghua Technology is responsible for the EPC general contracting of the technical renovation project for the air separation unit at Zhejiang Jinju Chemical Co., Ltd., with a capacity of 39,000 Nm3/h; the contract value is 262 million yuan.