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Delong Environment wins bid for zero-discharge project for concentrated brine in Shaanxi’s 1.2 million-ton ethylene glycol project Author/Source: Gasification World Date: 2021-09-10 Clicks: 17 Hebei Delong Environmental Engineering Co., Ltd. secured the EPC contract for the concentrated brine treatment system in Shaanxi Yueneng Chemical Materials Co., Ltd.’s coal-based ethylene glycol production project, thanks to its good reputation, extensive industry experience, strong technical capabilities, and competitive pricing. The project is located in the Qingshui Industrial Park of Yushen Industrial Zone in Yulin City, Shaanxi Province; it is a new EPC project with a contract value of 136 million yuan. Upon completion, this project will become a benchmark for zero-emission projects in China’s coal chemical industry. Leveraging its strong technical expertise in brine zero-discharge salt production projects, as well as in the treatment of industrial wastewater and municipal sewage, DeLong Environment has cultivated a team of engineering and technical personnel with excellent skills and extensive practical experience. To date, it has constructed and operated multiple municipal projects, brine desalination facilities, and industrial wastewater treatment plants, boasting extensive experience in treating pollution from industrial wastewater (especially from industries such as coking, coal chemical processing, and coal mining), in reusing treated water to achieve zero emissions, as well as in managing operations on a contractual basis and dealing with emergency situations. Delong Environment is a comprehensive environmental service provider focused on the design, construction, operation, and investment of industrial wastewater treatment systems. It boasts a strong team of design and technical experts, as well as experts in operation and management, along with a systematic operation and management platform and supplier network. Delong Environment can develop customized environmental protection solutions tailored to the environmental issues faced by clients, while also providing professional services for the operation of environmental protection facilities. The first phase of the project to produce 1.2 million tons per year of ethylene glycol, with an output of 400,000 tons per year, carried out by Shaanxi Yulin Energy Group Co., Ltd., is part of the company’s efforts to develop a base for producing clean fuels and high-end chemical materials in the Qingshui Industrial Park of the Yushen Industrial Zone. The total planned area for this project is 1,711 mu, with an estimated investment of 6.243 billion yuan; 532.6274 million yuan of that amount will be allocated to environmental protection measures. The construction period is set at 30 months, with completion and operation expected by June 2022. The first phase of Yulin Energy’s 400,000 tons per year ethylene glycol production facility uses coal blends as raw material, and Collins powder gasification is employed to produce crude syngas. The crude synthesis gas is divided into two streams after entering the shift reactor; one stream of crude synthesis gas undergoes heat recovery before being sent to low-temperature methanol washing to remove sulfur and CO2 impurities. The purified synthesis gas is then subjected to deep cryogenic separation to produce 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 which it is sent to a low-temperature methanol wash to remove sulfur and CO2 impurities. It then enters the PSA-H2 unit together with the hydrogen-rich gas obtained through cryogenic separation, to produce H2 for use in the ethylene glycol plant. Ethylene glycol synthesis is a technology of Zhongke Yuandong. Dimethyl oxalate (DMO) is synthesized from CO via an oxidation coupling reaction, and ethylene glycol is produced by the hydrogenation of DMO. The project scope includes a gasification unit, a purification unit, an H2/CO separation unit, and an ethylene glycol production unit, among others. The utility systems and supporting auxiliary facilities include: 3×350t/h high-temperature and high-pressure circulating fluidized bed boilers + 2×30MW back-pressure steam turbine generator sets, air separation units, circulating water stations, desalination stations, storage and transportation facilities, sewage treatment plants, etc. The gasification unit employs the Collin powder gasification technology and includes 2 powder gasifiers ； The ethylene glycol plant utilizes Zhongke Yuandong’s ethylene glycol technology.