【Major Equipment in the Chemical Engineering Sector】The acetylene screw compressors were successfully replaced with domestically produced versions from 2015 to 2022

【Major Chemical Equipment in a Major Country】October 2022 Series Summary Post https://bbs.hcbbs.com/thread-3552977-1-1.html (Source: Haichuan Network – Chemical Currents)

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The screw compressors in acetylene plants are the key mechanical devices in the BDO material chain, and they include cracking gas compressors and recycle gas compressors. The pyrolysis gas compressor serves as a link between different stages; it is responsible for transporting the pyrolysis gas containing acetylene and raising the gas pressure to 1.1 MPaA, thereby ensuring the effective purification in the downstream washing tower. As the core equipment of the entire process, the reliability of the pyrolysis gas compressor is an important factor affecting the continuous and stable operation of the facility. The circulating gas compressor is the core driving equipment in the acetylene concentration process. During the desorption process of acetylene-rich NMP solutions, this equipment enables the acetylene desorption tower to achieve and maintain a high vacuum level, ensuring that the partial pressure inside the tower remains within safe limits at all times. At the same time, it has the capability to improve the desorption efficiency of the solution and enable the cyclic absorption of the desorbed gas, thereby ensuring that the yield and concentration of acetylene product meet the requirements of downstream synthesis. The successful operation of the screw compressors in the acetylene production facility has broken the foreign monopoly, which is of great significance for ensuring the security of industrial and supply chains; it also lays a foundation for the rapid development of China’s biodegradable plastics industry chain.

Compared to vacuum compressor units, the pyrolysis gas compressors developed through this tripartite collaboration have higher pressure, a larger gas flow rate, and more stringent requirements for the compressor system. This set of acetylene cracking gas compression units will employ two-stage compression, with the rotor of the first stage having a diameter of 816 millimeters, making it the largest model in the industry. Upon completion of this project, the products of 711 Institute will achieve full coverage in the field of process gas screw compressors, reaching international advanced levels. Under the cooperation agreement, ACRI, Wanhua Chemical, and Chengda Engineering will bring together top technical experts to form a specialized R&D team, working together to explore improved solutions for acetylene gas systems. By establishing a closed-loop cooperation model that integrates product research and development, engineering design, and technology commercialization, and by leveraging complementary strengths, the adaptability of acetylene screw compressors to harsh operating conditions is enhanced. This facilitates their use in high-end technology markets, effectively promotes the localization of such compressors, and further boosts the competitiveness of the compressor products produced by Institute 711 in the international market.