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Successful Commissioning of the Turbine in Unit C of Hualu Technology’s Air Separation Unit at Inner Mongolia Rongxin Chemical Co., Ltd. Author/Source: Huahua Network – Coal Chemical Industry. Date: July 24, 2019. Clicks: 315. On July 11, the turbine in Unit C of the air separation unit part of Inner Mongolia Rongxin Chemical Co., Ltd.’s 400,000-ton per year coal-based ethylene glycol and 300,000-ton per year polyoxymethylenemethane production facility reached a speed of 4,573 revolutions per minute; the turbine was commissioned successfully, and the testing process for the air separation unit progressed rapidly. It is reported that the steam turbine is the core equipment of an air separation unit, serving to provide power for compressors, boosters, and other devices. The successful commissioning this time marks another important milestone achieved in the Inner Mongolia Rongxin project, laying a solid foundation for the oxygen and nitrogen production by the air separation unit. Both air separation units in the Rongxin project utilize technology from Air Liquide of France. Each unit has an oxygen production capacity of 92,000 Nm3/h; it supplies high- and low-pressure oxygen, low-pressure nitrogen, process air, and instrument air to downstream processes. Additionally, liquid nitrogen and liquid argon are produced as by-products. These units feature automatic load adjustment, a long service life, low energy consumption, and a high oxygen extraction efficiency. To ensure the successful completion of this startup process, the Inner Mongolia Rongxin project team at Hualu Engineering organized everything meticulously, coordinating closely with the client, patent holders, suppliers, civil engineering and installation contractors, as well as anti-corrosion and insulation teams. These parties worked overtime and overcame various challenges to carry out tasks such as pressure testing and purging of the P91 pipelines, mechanical and electrical debugging of the turbine units, oil system testing, instrument logic testing, and trial operation of the individual units and auxiliary systems. By implementing the \"three inspections and four determinations\" approach, various issues were identified and resolved in a timely manner, thus preparing thoroughly for the turbine startup. The 400,000-ton coal-to-ethylene glycol and 300,000-ton polyoxymethylenemethane circular economy demonstration project of Inner Mongolia Rongxin Chemical Co., Ltd. is located in the Sanyangliang Industrial Park in Dalat Banner, Inner Mongolia Autonomous Region. It represents a major project undertaken by the company to extend its industrial chain and promote the clean utilization of coal, building on its initial 900,000-ton coal-to-methanol project. The total investment in the project is 7.68 billion yuan, and construction began in August 2017. Using coal as raw material and the four-nozzle gasification technology developed by East China University of Science and Technology, the project produces CO and H2 required for ethylene glycol production, as well as syngas needed for methanol synthesis; ethylene glycol is synthesized via an indirect method, while DMMn is synthesized indirectly from methanol. Among them, the ethylene glycol plant entered into EPC general contract agreements for the project with China Wuhuan Engineering Co., Ltd. and Huashuo Technology Co., Ltd. Hualu Engineering is also responsible for the overall design, procurement, and construction of the polydimethyl methoxymethane project at Yanzhou Coal Industry Yulin Energy Chemical Co., Ltd., with an annual production capacity of 500,000 tons (100,000 tons in the first phase). The total investment for this project is 4.596 billion yuan. The project involves the production of polydimethyl methoxide from coal through methanol synthesis, and the main technologies used include coal gasification, raw gas purification, methanol synthesis, methanol distillation, sulfur recovery, and DMMn preparation. The project uses one set of oxygen generation equipment with a capacity of 92,000 Nm3/h ； Gasification is carried out using the multi-nozzle (opposed-type) water-coal slurry gasification technology owned by Yankuang Group, with a total effective gas production capacity of 240,800 Nm3/h. Three gasifiers with a capacity of 2,000 t/d each are installed (2 with quenching systems and 1 with a semi-waste boiler), operating in a 2-on-1-backup configuration ； The purification unit employs the Dalian University of Technology low-temperature methanol washing process ； Methanol synthesis utilizes technology from East China University of Science and Technology ； Distillation utilizes the Tianjin Beiyang five-column methanol distillation technology, with a processing capacity of 5,000 tons per day in total. The DMMn plant utilizes Metada DMMn technology, and its construction is carried out in two stages: first, a plant with an annual production capacity of 100,000 tons is built, followed by the construction of a plant with a capacity of 400,000 tons.