Thread Content
Public Announcement on the First Phase of Shaanxi Yulin Energy’s 1.2 Million Tonnes Per Year Coal-to-Ethylene Glycol Project Author/Source: Huahua Network – Coal Chemical Industry Date: 11-08-2019 Clicks: 42 Project Background: Shaanxi Yulin Energy Group Co., Ltd. is a comprehensive energy development company based in Yulin City. It was established in accordance with the provincial government’s decision to create Shaanxi’s third-largest energy group, with the aim of strengthening the local energy industry and enhancing the scale efficiency and core competitiveness of energy enterprises in Yulin. The company’s activities include coal mining, energy conversion, coal transportation and marketing, as well as the development of new energy sources. Based on the current situation of the enterprise and the development plans of the group company, and in line with the strategic approach to the transformation and upgrading of Yulin’s coal chemical industry, Yulin Energy Group plans to build a coal-based integrated production base in the Qingshui Industrial Zone of Yulin Industrial Park. This base will host industrial clusters for the production of ethylene glycol derived from coal, natural gas, aromatics, and polymers. This project represents the first phase of that industrial cluster, with an initial capacity of 400,000 tons per year of ethylene glycol production. Project Name: Phase I of Shaanxi Yulin Energy Group Co., Ltd.’s coal-based ethylene glycol production project – 400,000 tons per year of ethylene glycol; Project Type: New construction ； Construction location: Qingshui Industrial Park, Yushen Industrial Zone ； Staffing and operation system: 663 people, annual operating hours 7200h ； Total project investment: 5.86 billion yuan, with 532.6274 million yuan allocated to environmental protection measures, accounting for 9.1% of the total project investment ； Area: 907,000 m2. Products: Ethylene glycol, along with industrial products such as dimethyl carbonate, crude ethanol, mixed alcohols, sulfur, liquid oxygen, and liquid nitrogen ； The construction contents: The process units of the project mainly include a gasification unit, ash water treatment systems, shift and low-temperature methanol washing units, a crude ethylene glycol production unit, a refining unit, an ethylene glycol recovery unit, intermediate tank areas, and a sulfur recovery unit. Public utilities and auxiliary facilities include: boiler rooms, main substations, air separation units, circulating water stations, water treatment plants, fire water stations, desalination plants, sewage treatment plants, reclaimed water stations, accident ponds, flares, maintenance workshops, etc. The storage facilities include: vehicle-based coal unloading, strip stockyards, finished product tank areas and loading stations, chemical warehouses, general warehouses, and spare parts stores. Front plant area: comprehensive building office, central control room, central laboratory, cafeteria, shift dormitories, etc. The overall process flow: The project uses blended coal (Caojiatan coal and Longde coal) as raw material, and employs the Collin powder gasification technology to produce crude syngas. After entering the conversion unit, this crude syngas is divided into two streams; one stream undergoes heat recovery before being sent to a low-temperature methanol wash to remove sulfur and CO2 impurities. The purified syngas is then subjected to deep cryogenic separation to yield CO, which is used in the ethylene glycol production facility. The hydrogen-rich gas obtained from deep cryogenic separation is sent to a pressure swing adsorption unit for H2 extraction ； Another stream of crude syngas undergoes two stages of isothermal shift reaction; after sulfur and CO2 impurities are removed through low-temperature methanol washing, it is combined with the hydrogen-rich gas obtained through cryogenic separation and fed into PSA-H2 to produce H2 for use in the ethylene glycol plant. Part of the desorbed gas from PSA-H2 is returned to the CO cryogenic tank under pressure, while the remaining small portion enters the fuel gas network for use as fuel. Selection of process technologies for various units in the project